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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Форма поиска

Поддерживает ввод нескольких поисковых фраз (по одной на строку). При поиске обеспечивает поддержку морфологии русского и английского языка
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Применить Всего найдено 17889. Отображено 100.
05-01-2012 дата публикации

CPP-Type Magnetoresistive Element Including Spacer Layer

Номер: US20120002330A1
Автор: Hironobu Matsuzawa, Yoshihiro Tsuchiya
Принадлежит: TDK Corp

An MR element includes a first ferromagnetic layer, a second ferromagnetic layer, and a spacer layer disposed between the first and second ferromagnetic layers. The spacer layer includes a nonmagnetic metal layer, a first oxide semiconductor layer, and a second oxide semiconductor layer that are stacked in this order. The nonmagnetic metal layer is made of Cu, and has a thickness in the range of 0.3 to 1.5 nm. The first oxide semiconductor layer is made of a Ga oxide semiconductor, and has a thickness in the range of 0.5 to 2.0 nm. The second oxide semiconductor layer is made of a Zn oxide semiconductor, and has a thickness in the range of 0.1 to 1.0 nm.

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Номер записи: 1
05-01-2012 дата публикации

Information recording and reproducing apparatus, program for controlling same, computer-readable storage medium, method for controlling information recording and reproducing apparatus, and information storage medium

Номер: US20120002514A1
Автор: Atsushi Etoh, Hideharu Tajima, Hirohisa Yamada, Ikuo Nakarno, Masaki Yamamoto, Shigemi Maeda, Takashi Arimoto, Tetsuya Hayashi, Tetsuya Okumura, Yasuhiro Harada, Yoshihisa Adachi
Принадлежит: Sharp Corp

An invention disclosed includes a layer number obtaining section ( 222 ) for determining which information storage layer (L 1 ) has been accessed and a layer type identifying section ( 223 ) for identifying a type of the information storage layer (L 1 ) determined by the layer number obtaining section ( 222 ). With the configuration, even in a case where an information recording and reproducing apparatus accesses an information storage layer different from an intended information storage layer by false operation or the like, it is still possible to dissolve mismatching between a recording or reproduction control scheme being set up and a recording or reproduction control scheme suitable for the information storage layer thus accessed.

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Номер записи: 2
12-01-2012 дата публикации

Optical information recording reproduction apparatus and optical information recording reproduction method

Номер: US20120008484A1
Автор: Hisayuki Yamatsu, Tetsuhiro Sakamoto
Принадлежит: Sony Corp

An optical information recording reproduction apparatus includes: a first light beam source; a second light beam source emitting a beam with a wavelength shorter than that of the first light beam source; and an object lens condensing the beams from the first and second light beam sources to an optical information recording medium. When information is recorded in the optical information recording medium, a recording beam is emitted from the first light beam source and a beam used to generate a signal for controlling a position of the object lens is emitted from the second light beam source. When the information of the optical information recording medium is reproduced, a reproduction beam is emitted from the second light beam source.

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Номер записи: 3
12-01-2012 дата публикации

Objective Lens, Optical Pickup Apparatus, and Optical Information Recording Reproducing Apparatus

Номер: US20120008485A1
Автор: Eigo Sano, Yuichi Ozaki
Принадлежит: Konica Minolta Opto Inc

An objective lens relating to the present invention includes a first optical path difference providing structure in which a first basic structure and a second basic structure are overlapped with each other. The first basic structure is a blaze-type structure which emits a Xth-order diffracted light flux, when the first light flux passes through the first basic structure, where the value of X is an odd integer. At least a part of the first basic structure arranged around an optical axis includes a step facing an opposite direction to the optical axis. The second basic structure is a blaze-type structure which emits a Lth-order diffracted light flux, when the first light flux passes through the second basic structure, where the value of L is an even integer. At least a part of the second basic structure arranged around the optical axis includes a step facing the optical axis.

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Номер записи: 4
12-01-2012 дата публикации

Information storage medium, reproducing method, and recording method

Номер: US20120011525A1
Автор: Hideo Ando, Koji Takazawa, Seiji Morita
Принадлежит: Individual

According to one embodiment, an information storage medium includes an organic dye material which records information with a light beam having a wavelength equal to or smaller than 620 nm.

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Номер записи: 5
02-02-2012 дата публикации

Optical pickup device

Номер: US20120026858A1
Автор: Kenji Nagatomi, Masayuki Yoshie, Shigeharu Shirane, Shinsei Kasahara
Принадлежит: Sanyo Electric Co Ltd

An optical pickup device has an astigmatism element which imparts astigmatism to reflected light of laser light reflected on a recording layer, and a spectral element into which the reflected light is entered, and which separates the reflected light. The spectral element is divided into four third areas by a first area having a certain width and formed along a straight line in parallel to a first direction, and by a second area having a certain width and formed along a straight line in parallel to a second direction. The spectral element is configured to guide the reflected light passing through the four third areas to respective corresponding sensors on a photodetector while making propagating directions of the reflected light different from each other, and to avoid guiding the reflected light entered into the first area and into the second area to the sensors.

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Номер записи: 6
16-02-2012 дата публикации

Method for manufacturing porous structure and method for forming pattern

Номер: US20120037594A1
Автор: Koji Asakawa, Toshiro Hiraoka, Yasuyuki Hotta, Yoshihiro Akasaka
Принадлежит: Individual

A pattern forming material contains a block copolymer or graft copolymer and forms a structure having micro polymer phases, in which, with respect to at least two polymer chains among polymer chains constituting the block copolymer or graft copolymer, the ratio between N/(Nc−No) values of monomer units constituting respective polymer chains is 1.4 or more, where N represents total number of atoms in the monomer unit, Nc represents the number of carbon atoms in the monomer unit, No represents the number of oxygen atoms in the monomer unit.

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Номер записи: 7
16-02-2012 дата публикации

Hybrid Near-Field Transducer For Heat Assisted Magnetic Recording

Номер: US20120039155A1
Автор: Chubing Peng, Jie Zou, Kaizhong Gao, Michael Allen Seigler
Принадлежит: SEAGATE TECHNOLOGY LLC

An apparatus includes a planar waveguide having a core layer and a cladding layer adjacent to the core layer, the waveguide being shaped to direct light to a focal point; a magnetic pole adjacent to the cladding layer; and a near-field transducer positioned adjacent to the focal point, wherein the near-field transducer includes an enlarged portion and a peg having a first end positioned adjacent to an end of the waveguide and a second end positioned adjacent to a side of the enlarged portion. A data storage device that includes the apparatus is also provided.

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Номер записи: 8
01-03-2012 дата публикации

Optical pickup apparatus

Номер: US20120051205A1
Автор: Chiaki Asakawa, Mitsuhiro Hiruma
Принадлежит: Sanyo Electric Co Ltd

Provided is an optical pickup apparatus using a reduced number of parts. An optical pickup apparatus ( 26 ) of the present invention includes: a laser unit ( 108 ) for emitting a laser beam complying with the BD standards; a laser unit ( 106 ) for emitting a laser beam complying with the DVD standards and a laser beam complying with the CD standards; and a PDIC ( 10 B) for receiving and detecting the laser beams complying with the respective standards. Because the laser beam complying with the DVD standards and the laser beam complying with the BD standards are received by one photo detector provided in the PDIC ( 10 B), the number of parts needed for the optical pickup apparatus ( 26 ) can be reduced, and the costs of the apparatus can be decreased.

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Номер записи: 9
22-03-2012 дата публикации

Magnetic head, magnetic head assembly, and magnetic recording/reproducing apparatus

Номер: US20120069474A1
Автор: Hitoshi Iwasaki, Masayuki Takagishi, Susumu Hashimoto
Принадлежит: Toshiba Corp

According to one embodiment, a magnetic head includes a reproducing section. The reproducing section has a medium facing surface facing a magnetic recording medium and detects a direction of magnetization recorded in the medium. The reproducing section includes a first magnetic pinned layer, a second magnetic pinned layer, and a magnetic free layer. Directions of magnetizations of the first and second magnetic pinned layers are pinned. The second magnetic pinned layer is stacked with the first magnetic pinned layer in a first direction parallel to the medium facing surface. The magnetic free layer is provided between the first and second magnetic pinned layers. A direction of magnetization of the magnetic free layer is changeable. A length of the magnetic free layer along a second direction perpendicular to the medium facing surface is shorter than lengths of the first and second magnetic pinned layers along the second direction.

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Номер записи: 10
22-03-2012 дата публикации

System, method and apparatus for fabricating a c-aperture or e-antenna plasmonic near field source for thermal assisted recording applications

Номер: US20120070784A1
Автор: Barry Cushing Stipe, Hamid Balamane, Jordan Asher Katine, Thomas Dudley Boone, JR.
Принадлежит: Hitachi Global Storage Technologies Netherlands BV

A method of fabricating a c-aperture or E-antenna plasmonic near field source for thermal assisted recording applications in hard disk drives is disclosed. A c-aperture or E-antenna is built for recording head applications. The technique employs e-beam lithography, partial reactive ion etching and metal refill to build the c-apertures. This process strategy has the advantage over other techniques in the self-alignment of the c-aperture notch to the c-aperture internal diameter, the small number of process steps required, and the precise and consistent shape of the c-aperture notch itself.

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Номер записи: 11
29-03-2012 дата публикации

Method for manufacturing head including light source unit for thermal assist

Номер: US20120073120A1
Автор: Koji Shimazawa, Nobuyuki Mori, Seiichi Takayama, Shinji Hara, Yoshihiro Tsuchiya
Принадлежит: TDK Corp

Provided is a method for manufacturing a thermally-assisted magnetic recording head in which a light source unit including a light source and a slider including an optical system are joined. The method comprises steps of: adhering by suction the light source unit with a back holding jig; bringing the light source unit into contact with a slider back surface of the slider; applying a load to a load application surface of the light source unit by a loading means to bring a joining surface of the light source unit into conformity with the slider back surface; positioning the light source unit apart from the slider, and then aligning the light source with the optical system; bringing again the light source unit into contact with the slider; and applying a load again to the load application surface to bring the joining surface into conformity with the slider back surface. Thus, the conformity between them can be significantly increased, thereby achieving adequately strong junction and adequately high accuracy in position.

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Номер записи: 12
05-04-2012 дата публикации

Optical pickup device

Номер: US20120082020A1
Автор: Kenji Nagatomi
Принадлежит: Sanyo Electric Co Ltd

An astigmatism element converges laser light in first and second directions to generate focal lines. A spectral element makes propagating directions of light fluxes entered into first through fourth areas different from each other to disperse the four light fluxes from each other. The direction along which the first and second areas are aligned is in parallel to a direction of a track image of a recording medium projected onto the spectral element. Each of the first and second areas has a surface area larger than a surface area of each of the third and fourth areas, and a boundary portion between the first and second areas, and the third and fourth areas includes a straight portion extending in a direction perpendicular to the direction of the track image.

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Номер записи: 13
05-04-2012 дата публикации

Optical pickup device

Номер: US20120082021A1
Автор: Ui-yol Kim, Yong-Jae Lee
Принадлежит: Toshiba Samsung Storage Technology Korea Corp

An optical pickup device, an optical drive using the same, and a method of forming a beam spot are provided. The optical pickup includes a light source system that includes a light source corresponding to at least one of a digital versatile disc (DVD) and a Blu-ray disc (BD). The light source forms a beam spot having an oval shape with a long axis and a short axis on an information recording track of the disc, and the light source is disposed such that the long axis is maintained at an angle ranging from 0° to 30° with respect to a radial direction passing through a rotation center of the disc.

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Номер записи: 14
12-04-2012 дата публикации

Method of manufacturing thermal assisted magnetic write head

Номер: US20120084969A1
Автор: Kosuke Tanaka, Shinji Hara, Tsutomu Chou, Yasutoshi Fujita
Принадлежит: SAE Magnetics HK Ltd, TDK Corp

A method of manufacturing a thermally-assisted magnetic write head is provided. The method includes steps of: forming a laminate structure including the waveguide; the plasmon generator, and the magnetic pole in order; performing a first polishing process to planarize an end surface of the laminate structure; performing a first etching process to remove impurity attached on the end surface of the laminate structure, and to allow the plasmon generator to be recessed from the waveguide and the magnetic pole, thereby forming a recessed region on the end surface of the laminate structure; forming a protection layer on the end surface of the laminate structure such that at least the recessed region is filled; and performing a second polishing process on the end surface of the laminate structure formed with the protection layer until the plasmon generator is exposed, thereby completing the air bearing surface.

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Номер записи: 15
19-04-2012 дата публикации

Recording apparatus and control method

Номер: US20120092976A1
Автор: Yoshiyuki Urakawa
Принадлежит: Sony Corp

A recording apparatus including: a light-illuminating/receiving-unit illuminating an optical-disc-recording-medium through a common object-lens with recording-light and ATS-light and receiving reflected-ATS-light; a rotation-driving-unit driving rotation of the medium; a tracking-mechanism driving the lens in a tracking-direction parallel to the radial direction; a tracking-error-signal-generation-unit generating a tracking-error-signal; and a tracking-servo-controller performing tracking-servo-control on the lens based on the tracking-error-signal, wherein the tracking-servo-controller includes: a servo-calculation-unit based on the tracking-error-signal in a feedback-loop as a tracking-servo-loop; and a feed-forward-controller calculating an estimated control-target-value of the tracking-servo-control based on an estimated illumination-spot-position value of the ATS-light obtained in a first-filter-process emulating a transfer-characteristic of the tracking-mechanism on an output of the servo-calculation-unit and a distance between the illumination-spot-positions and applies a control-signal generated in a second-filter-process on the estimated value for suppressing a transfer-characteristic-gain of the tracking-servo-loop to 0 dB or less in the entire band to the tracking-servo-loop.

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Номер записи: 16
03-05-2012 дата публикации

Optical head device and optical disc device

Номер: US20120106310A1
Автор: Hironori Nakahara, Kenya Nakai, Masahisa Shinoda, Masayuki Omaki, Nobuo Takeshita
Принадлежит: Mitsubishi Electric Corp

An optical head device mounted in an optical disc device. The optical head device is provided with a diffractive optical element and a photodetector. The diffractive optical element has: a primary diffraction region at a location on which the positive and negative first-order components and some of the zero-order component of a reflectively diffracted light beam are incident; and secondary diffraction regions at locations on which the rest of the zero-order component but none of the positive or negative first-order components of the reflectively diffracted light beam are incident. A main light-receiving section of the photodetector receives the zero-order component of a transmissively diffracted light beam that has passed through the primary diffraction region and the secondary diffraction regions. Secondary light-receiving sections receive the positive first-order component and/or the negative first-order component of the transmissively diffracted light beam that has passed through the secondary diffraction regions.

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Номер записи: 17
10-05-2012 дата публикации

Information recording medium, optical information recording and reproducing apparatus, optical information recording and reproducing method and manufacturing method of information recording medium

Номер: US20120113772A1
Автор: Noboru Yamada, Teruhiro Shiono
Принадлежит: Panasonic Corp

To provide an information recording medium which is capable of reducing damage to a recording layer while improving environmental resistance of the recording layer and which enables information to be recorded or reproduced at a high density and a high sensitivity, an optical information recording and reproducing apparatus, an optical information recording and reproducing method, and a manufacturing method of an information recording medium. An information recording medium ( 24 ) includes: a substrate ( 1 ); first to m th (where m is an integer equal to or greater than 1) recording layers ( 2 ) respectively provided on an incident side of recording light or reproducing light with respect to the substrate ( 1 ) in order of distance closer to the incident side; and first to m th (where m is an integer equal to or greater than 1) negative refractive index layers ( 3 ) respectively provided on the incident side of the recording light or the reproducing light with respect to the m th recording layer ( 2 ) in order of distance closer to the incident side, wherein an i th (1≦i≦m) recording layer ( 2 ) and an i th negative refractive index layer ( 3 ) are alternately provided on the substrate ( 1 ), and the first to m th negative refractive index layers ( 3 ) effectively have a negative refractive index at a wavelength of the recording light or the reproducing light.

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Номер записи: 18
24-05-2012 дата публикации

Magnetic tunnel junction having a magnetic insertion layer and methods of producing the same

Номер: US20120127603A1
Автор: Chando Park, Chang-Man Park, Liubo Hong, Richard Hsiao, Sangmun Oh, Zheng Gao
Принадлежит: Hitachi Global Storage Technologies Netherlands BV

According to one embodiment, a magnetic head includes a barrier layer having a crystalline structure, a first magnetic layer above the barrier layer, a magnetic insertion layer above the first magnetic layer, and a second magnetic layer above the magnetic insertion layer, the second magnetic layer having a textured face-centered cubic (fcc) structure. The first magnetic layer comprises a high spin polarization magnetic material having a crystalline structure and a characteristic of crystallization being more similar to the crystalline structure of the barrier layer than a crystalline structure of the second magnetic layer and the magnetic insertion layer comprises a magnetic material having a crystalline structure and a characteristic of crystallization being more similar to the crystalline structure of the second magnetic layer than the crystalline structure of the barrier layer. Additional magnetic head structures and methods of producing magnetic heads are described according to more embodiments.

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Номер записи: 19
07-06-2012 дата публикации

Method for performing burn-in test

Номер: US20120139566A1
Автор: Koji Shimazawa, Masaaki Kaneko, Takashi Honda, Tsuguki Noma, Yoichi Mugino, Yoshito NISHIOKA
Принадлежит: ROHM CO LTD, TDK Corp

Provided is a method for performing a burn-in test on an object under test in which a plurality of electrodes are provided in positions at different heights. The method comprising steps of: preparing an object under test in which an electrode in a higher position have a higher surface roughness among the plurality of electrodes; bringing a plurality of sheet-type probes into contact with the plurality of electrodes, respectively; and supplying an electric current with the plurality of electrodes through the plurality of sheet-type probes. By implementing the method, the sheet-type probes can be kept in stable contact with the electrodes because electrodes in a higher position have a higher surface roughness Ra than electrodes in a lower position. Consequently, stable and reliable burn-in test can be performed.

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Номер записи: 20
14-06-2012 дата публикации

Light-emitting device

Номер: US20120147602A1
Автор: Toshiaki Konno, Yoshihiro Someno
Принадлежит: Alps Electric Co Ltd

A holding hole of a holding body has an edge portion and an inner peripheral surface which is a concavely curved surface connected to the edge portion. In a light source unit which supports a light source, projections are formed at three locations, and each of front surfaces thereof has a convexly curved line having a curvature radius longer than that of the inner peripheral surface. When the light source unit is inserted into the holding hole, the front surfaces of the projections at the three locations are brought into point contact with the edge portion at contact portions on the convexly curved lines. By performing laser welding at these contact portions, the attitude of the light source unit after its tilt adjustment can be stabilized and fixed to the holding body.

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Номер записи: 21
14-06-2012 дата публикации

Nanometer Scale Instrument for Biochemically, Chemically, or Catalytically Interacting with a Sample Material

Номер: US20120147722A1
Автор: Victor B. Kley
Принадлежит: General Nanotechnology LLC

A data storage system that includes a positioning system for positioning the write/read mechanism and the storage medium of the data storage device with respect to each other in first and second predefined directions. In several embodiments, the read/write mechanism is used to mechanically write data to and electrically read data from the storage medium. In still another embodiment, the read/write mechanism is used to optically write data to and electrically read data from the storage medium. In yet another embodiment, the read/write mechanism is acoustically aided in electrically writing data to and reading data from the storage medium.

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Номер записи: 22
14-06-2012 дата публикации

Reproducing apparatus and reproducing method

Номер: US20120147725A1
Автор: Daisuke Ueda, Hirotaka Miyamoto, Kimihiro Saito
Принадлежит: Sony Corp

A reproducing apparatus includes: a first laser irradiation section irradiating an optical recording medium having a bulk recording layer and recording marks formed by focusing a laser beam on each predetermined layer position in the recording layer, with a first laser beam through an objective lens; a focus position adjusting section adjusting a focus position of the first laser beam; a beam receiving section receiving a reflected beam of the first laser beam from the marks and generating a light receiving signal; a reproducing section reproducing information recorded with the marks based on the light receiving signal; and a control section performing control to allow the focus position in reproduction of the information to correspond to a position shifted by a certain distance to an upper layer side from a focus position of the laser beam in forming the mark at the layer positions as a reproducing object.

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Номер записи: 23
14-06-2012 дата публикации

Optical disk record and playback apparatus and pickup protecting method thereof

Номер: US20120151506A1
Автор: Yorio Takahashi
Принадлежит: Panasonic Corp

The present invention avoids a case in which a pickup lens and a lens protector come into contact with a structure of a disk cartridge and are damaged. When an operation distance is short and there is a disk cartridge 203 and the disk cartridge 203 is not an exclusive cartridge, a moving range of the pickup 107 is restricted or an actuating operation thereafter is stopped depending upon whether the optical disk medium 101 loaded into the optical disk apparatus is an optical disk medium having a short operation distance, whether there is a disk cartridge 203, and whether a structure of the disk cartridge 203 is prevented from coming into contact with a pickup lens or the lens protector which is exclusive for the optical disk medium having the short operation distance.

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Номер записи: 24
14-06-2012 дата публикации

Optical head device, optical information device, and information processing device

Номер: US20120151508A1
Автор: Hideki Nakata, Joji Anzai, Keisuke Fujimoto, Kousei Sano, Takeharu Yamamoto, Takeshi Shimamoto, Yasumori Hino, Yoshiaki Komma
Принадлежит: Panasonic Corp

When information is recorded or reproduced on or from an optical information medium having three or more recording layers using blue light, interference by another layer light is reduced and, when information is reproduced from an optical information medium using red light, an S/N ratio is held excellently high. An optical head device includes a first laser light source ( 1 ) which emits blue light, a second laser light source ( 2 ) which emits red light, an objective lens ( 11 ) which focuses the blue light onto a recording layer of a first optical disc ( 12 ) or focuses the red light onto a recording layer of a second optical disc ( 13 ), a photodetector ( 9 ) which receives the blue light reflected by the recording layer of the first optical disc ( 12 ) or the red light reflected by the recording layer of the second optical disc ( 13 ) and outputs an electric signal in accordance with an amount of the received blue light or red light, and a wavelength selective light blocking region ( 7 x ) which blocks a predetermined range of the blue light including an optical axis thereof to prevent the predetermined range from reaching the photodetector ( 9 ), and transmits the red light.

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Номер записи: 25
21-06-2012 дата публикации

Recording methods and devices for recording information on dual layer recordable disks

Номер: US20120155234A1
Автор: Johannus Leopoldus Bakx
Принадлежит: KONINKLIJKE PHILIPS ELECTRONICS NV

The invention relates to recording methods for recording information on a dual layer recordable disk, and to corresponding recording devices. In one such method and recording device the OPC-area is variably located on a layer of the disk. In a preferred embodiment the OPC-area is located relative close to the radius where the data stream switches from the first layer to the second layer. This reduced additional time required for jumping to a fixed OPC-area. Furthermore, in another such method and device the information to be recorded is equally divided over both layers of the dual layer disc. This avoids additional time required for finalization.

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Номер записи: 26
21-06-2012 дата публикации

Method for high density data storage and imaging

Номер: US20120155242A1
Автор: Armin W. Knoll, Bernd Walter Gotsmann, Charles Gordon Wade, Erik Christopher Hagberg, James Lupton Hedrick, Jane Elizabeth Frommer, Johannes Windeln, Robert Dennis Miller, Russell Clayton Pratt, Teddie Peregrino Magbitang, Urs T. Duerig, Victor Yee-Way Lee
Принадлежит: International Business Machines Corp

An approach is presented for designing a polymeric layer for nanometer scale thermo-mechanical storage devices. Cross-linked polyimide oligomers are used as the recording layers in atomic force data storage device, giving significantly improved performance when compared to previously reported cross-linked and linear polymers. The cross-linking of the polyimide oligomers may be tuned to match thermal and force parameters required in read-write-erase cycles. Additionally, the cross-linked polyimide oligomers are suitable for use in nano-scale imaging.

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Номер записи: 27
05-07-2012 дата публикации

Optical head device, optical information device and information processing device

Номер: US20120170431A1
Автор: Kousei Sano, Yoshiaki Komma
Принадлежит: Panasonic Corp

An optical head device includes a light blocking region ( 7 y ) which is disposed on a light flux of a reflected light beam resulting from reflection by a recording layer on which a blue light beam is focused, and blocks, when there are at least two recording layers on a blue light beam incident side of the recording layer on which the blue light beam is focused or on a side thereof opposite to the blue light beam incident side, reflected light beams resulting from reflection by the at least two recording layers which are incident on a region in a photodetector ( 9 ) where the reflected light beams resulting from the reflection by the at least two recording layers interfere with each other. The light blocking region ( 7 y ) is not formed on an optical axis of the reflected light beam resulting from the reflection by the recording layer on which the blue light beam is focused. This configuration allows an improvement in the S/N ratio of a signal outputted from the photodetector.

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Номер записи: 28
12-07-2012 дата публикации

Magnetic reading and writing device

Номер: US20120176699A1
Автор: Takashi Hayashi
Принадлежит: Fuji Electric Co Ltd

In a magnetic reading/writing device, a controller derives at each radius of a recording medium a slope of a curve of track-averaged write performance with respect to an adjustment parameter, and determines a first set of fitting coefficients of a first equation approximating the derived slopes in terms of a first variable representing each radius. The controller acquires write performance dependence on a variable representing each of multiple circumferential positions of the medium by measuring track average write performance with respect to the circumferential positions, and determines a second set of fitting coefficients to approximate by a periodic function the acquired dependence in terms of the first variable. The controller corrects a condition value representing the adjustment parameter by subtracting from the condition value an adjustment value obtained from functions calculated with the first and second sets of fitting coefficients.

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Номер записи: 29
12-07-2012 дата публикации

Recording layer for optical information recording medium, optical information recording medium, and sputtering target

Номер: US20120176883A1
Автор: Takeshi Miki, Yasuhiro Sone, Yoko Shida, Yuki Tauchi
Принадлежит: Kobe Steel Ltd, Sony Corp

A recording layer for optical information recording medium excellent in recording property, an optical information recording medium including the recording layer and a sputtering target useful for formation of the recording layer are provided. A recording layer for an optical information recording medium on which recording is performed through irradiation with laser light, the recording layer including an oxide of a metal of which an absolute value of the standard free energy of oxide formation per 1 mol of oxygen is larger than that of Pd (hereinafter referred to metal X) and a Pd oxide, wherein the Pd oxide includes a Pd monoxide and a Pd dioxide, and wherein a ratio of the Pd atom to a total of the metal X atom and the Pd atom which are contained in the recording layer is 4 to 85 atomic %.

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Номер записи: 30
19-07-2012 дата публикации

Optical recording medium and recording method

Номер: US20120182851A1
Автор: Daisuke Ueda, Junichi Horigome, Kimihiro Saito, Seiji Kobayashi, Toshihiro Horigome
Принадлежит: Sony Corp

Techniques for recording and reading information to/from a recording medium based on positions of a plurality of marks are described herein. Each of the plurality of marks may have the same length. The information may be recorded based on a mark interval between successive marks. Apparatus and a recording medium suitable for use with such techniques are also disclosed.

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Номер записи: 31
09-08-2012 дата публикации

Transducer head temperature monitoring

Номер: US20120201108A1
Автор: Jorge Hanchi, Kaizhong Gao, Timothy William Stoebe, Xuan Zheng
Принадлежит: SEAGATE TECHNOLOGY LLC

Changes in the thermal boundary condition near a close point of an ABS to a media indicate proximity of the ABS with the media. Before contact, heat conduction from the ABS is primarily through convective and/or ballistic heat transfer to air between the ABS and the media. After contact, heat flux primarily flows from the ABS to the media through solid-solid conductive contact. Further, a light source within a HAMR transducer head may create additional thermal variations within the transducer head. These thermal variations create temperature variations within the transducer head. Two resistance temperature sensors on the transducer head at varying distances from the close point and/or light source measure these temperature variations. A temperature difference between the two resistance temperature sensors indicates proximity of the close point to the media and/or light output.

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Номер записи: 32
09-08-2012 дата публикации

Multilayer optical recording medium

Номер: US20120201118A1
Автор: Atsuko Kosuda, Motohiro Inoue, Takashi Kikukawa, Tomoki Ushida
Принадлежит: TDK Corp

An object of the present invention is to increase the number of stacked layers in a multilayer optical recording medium while simplifying the design of the multilayer optical recording medium. Provided is a multilayer optical recording medium 10 including at least four recording and reading layers from which information can be reproduced by light irradiation, the layers stacked through intermediate layers. The multilayer optical recording medium 10 includes the plurality of recording and reading layers that are continuous in order of stacking and includes at least one recording and reading layer group in which reflectance in a stacked state decreases from a near side of a light incident surface to a far side. A single-layer reflectance of the nearest recording and reading layer is set to 0.2% or more and less than 2.0%, and a light transmittance improvement process is applied to the light incident surface.

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Номер записи: 33
09-08-2012 дата публикации

Optical information recording medium

Номер: US20120201993A1
Автор: Hiroshi Tabata
Принадлежит: Sony Corp

An optical information recording medium including: a substrate; two or more information signal layers provided on the substrate; and a cover layer provided on the information signal layers, wherein the surface of one of the side of the substrate and the cover layer is a light irradiation plane, wherein at least one of the information signal layers other than the information signal layer at the deepest portion from the light irradiation plane includes an inorganic recording layer that includes a W oxide and a Pd oxide, a first protective layer that is provided on a first principal plane of the inorganic recording layer, and a second protective layer that is provided on a second principal plane of the inorganic recording layer, wherein at least one of the first protective layer and the second protective layer is a layer with an extinction coefficient of 0.05 to 0.6.

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Номер записи: 34
16-08-2012 дата публикации

Semiconductor light emitting device, optical pickup unit and information recording/reproduction apparatus

Номер: US20120205680A1
Автор: Abe Hiroaki, FUJIMOTO Tsuyoshi, Kentaro Aoshima, Kudou Hisashi, Yuji Furushima
Принадлежит: Sony Corp

A semiconductor light emitting device downsized by devising arrangement of connection pads is provided. A second light emitting device is layered on a first light emitting device. The second light emitting device has a stripe-shaped semiconductor layer formed on a second substrate on the side facing to a first substrate, a stripe-shaped p-side electrode supplying a current to the semiconductor layer, stripe-shaped opposed electrodes that are respectively arranged oppositely to respective p-side electrodes of the first light emitting device and electrically connected to the p-side electrodes of the first light emitting device, connection pads respectively and electrically connected to the respective opposed electrodes, and a connection pad electrically connected to the p-side electrode. The connection pads are arranged in parallel with the opposed electrodes.

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Номер записи: 35
23-08-2012 дата публикации

Magneto-resistive effect element having spacer layer including gallium oxide layer with metal element

Номер: US20120212860A1
Автор: Hayato Koike, Hironobu Matsuzawa, Tsutomu Chou, Yoshihiro Tsuchiya
Принадлежит: TDK Corp

A magneto-resistive effect (MR) element includes: first and second magnetic layers in which a relative angle formed by magnetization directions changes according to an external magnetic field; and a spacer layer positioned between the first magnetic layer and the second magnetic layer. The spacer layer includes a main spacer layer composed of gallium oxide as a primary component and containing at least one metal element selected from a group of magnesium, zinc, indium and aluminum.

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Номер записи: 36
23-08-2012 дата публикации

Optical head, optical disc device, information processing device, and objective lens

Номер: US20120213052A1
Автор: Fumitomo Yamasaki, Katsuhiko Hayashi, Yoshiaki Komma
Принадлежит: Panasonic Corp

Provided are an optical head capable of favorably recording or reproducing information to or from an information recording medium including a plurality of information recording surfaces, an optical disc device including the optical head, an information processing device including the optical disc, and an objective lens. The optical head ( 40 ) includes a blue-violet laser light source ( 1 ) which emits a blue-violet laser beam, an objective lens ( 8 ) which has an orbicular zone-shaped diffractive structure, and which diffracts the blue-violet laser beam and converges the generated diffracted light of n-th order (where n is a natural number) on a predetermined information recording surface of a multi-layer optical disc ( 60 ), and a light-receiving element ( 23 ) which receives the blue-violet laser beam reflected by the predetermined information recording surface, wherein the diffractive structure adds a positive power component and a spherical aberration component to the n-th order diffracted light.

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Номер записи: 37
20-09-2012 дата публикации

Phase-change material and phase-change type memory device

Номер: US20120235110A1
Автор: Junichi Koike, Toshiya Kamada, Yuji Sutou, Yuta Saito
Принадлежит: Tohoku University NUC

A phase-change material, which has a high crystallization temperature and is superior in thermal stability of the amorphous phase, which has a composition of the general chemical formula Ge x M y Te 100-x-y wherein M indicates one type of element which is selected from the group which comprises Al, Si, Cu, In, and Sn, x is 5.0 to 50.0 (at %) and y is 4.0 to 45.0 (at %) in range, and x and y are selected so that 40 (at %)≦x+y≦60 (at %). This phase-change material further contains, as an additional element L, at least one type of element L which is selected from the group which comprises N, O, Al, Si, P, Cu, In, and Sn in the form of Ge x M y L z Te 100-x-y-z wherein z is selected so that 40 (at %)≦x+y+z≦60 (at %).

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Номер записи: 38
20-09-2012 дата публикации

Optical pickup apparatus, integrated circuit, and method for controlling laser output of optical pickup apparatus

Номер: US20120236887A1
Автор: Hiroshi Kojima, Hisayoshi Uchiyama, Masashi Arai, Rui KURIHARA
Принадлежит: Semiconductor Components Industries LLC

An optical-pickup apparatus includes: a first laser light source including a first laser diode to emit a laser beam having a first wavelength, and a back-monitor photodetector to receive the laser beam emitted in a backward direction, not being an optical-disc direction, and output a first monitor signal; a second laser-light source including a second laser diode to emit a laser beam having a second wavelength; a light-receiving circuit including a front-monitor photodetector to receive the laser beam emitted in a forward direction, being the optical-disc direction, and output a second monitor signal, and a switch circuit to be inputted with the first and second monitor signals, and output the first or second monitor signal according to a switch signal; and first and second drive circuits to drive the first and second laser diodes according to the first and second monitor signals outputted from the light-receiving circuit, respectively.

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Номер записи: 39
04-10-2012 дата публикации

Magnetic head including side shield layers on both sides of a mr element

Номер: US20120250189A1
Автор: Kenzo Makino, Naomichi Degawa, Satoshi Miura, Shohei Kawasaki, Takahiko Machita, Takekazu Yamane, Takumi YANAGISAWA, Yoshikazu Sawada
Принадлежит: TDK Corp

A magnetic head that reads information of a magnetic recording medium is provided. The magnetic head according to one embodiment includes: an MR element, formed with multilayer films, of which an electrical resistance changes according to an external magnetic field; a first shield layer that is disposed on a lower side in an lamination direction of the MR element; a second shield layer that is disposed on an upper side in the lamination direction of the MR element, and that applies voltage to the MR element together with the first shield layer; and side shield layers that are disposed on both sides of the MR element in a truck width direction. The side shield layers include soft magnetic layers and hard magnetic layers magnetized in a predetermined direction.

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Номер записи: 40
04-10-2012 дата публикации

Magnetic head for microwave assisted magnetic recording

Номер: US20120250472A1
Автор: Akimasa Kaizu, Hayato Koike, Naomichi Degawa, Takekazu Yamane, Yoshikazu Soeno
Принадлежит: TDK Corp

A magnetic head that writes information to a recording medium includes a magnetic pole layer that generates a writing magnetic field to the recording medium, a microstripline that is disposed in proximity to the magnetic pole layer and to which high frequency current is applied, and a ferromagnetic thin film that is disposed on a portion of the microstripline that faces the recording medium, and that generates a high frequency alternate-current (AC) magnetic field to be applied to the recording medium, using a current magnetic field generated on the microstripline due to the high frequency current.

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Номер записи: 41
04-10-2012 дата публикации

Optical disc device and recording method

Номер: US20120250482A1
Автор: Takeshi Ogata
Принадлежит: Hitachi Consumer Electronics Co Ltd

An optical disc device and a recording method is provided in which information can be additionally recorded on an optical disc, which has a servo layer and recording layers separately formed, by accurately correcting a relative angle between a light beam and the optical disc used in the previous recording without providing an area where recording is not performed while maintaining the stability of tracking servo. The above subject can be solved by studying with high accuracy the relative angle between the optical disc and the optical axis used in the previous recording by applying a radial tilt servo according to a signal from the recording layers with the tracking servo applied by the servo layer. Further, the additional recording can be performed stably by fixing the radial tilt at the previously studied angle when the recording is performed.

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Номер записи: 42
18-10-2012 дата публикации

Magnetic recording head, head gimbal assembly with the same, and disk drive

Номер: US20120262821A1
Автор: Hitoshi Iwasaki, Katsuhiko Koui, Kenichiro Yamada, Masayuki Takagishi, Tomoko Taguchi
Принадлежит: Toshiba Corp

According to one embodiment, a magnetic recording head includes a main pole configured to apply a recording magnetic field perpendicular to a recording medium, a trailing-shield pole opposed to the main pole with a recording gap therebetween, a high-frequency oscillator between the main pole and the trailing-shield pole in the recording gap, configured to produce a high-frequency magnetic field, a magnetic seed layer between the main pole and the high-frequency oscillator and in contact with the main pole, and a highly oriented magnetic layer of a soft magnetic material superposed on the magnetic seed layer between the main pole and the high-frequency oscillator and in contact with the high-frequency oscillator.

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Номер записи: 43
25-10-2012 дата публикации

Magnetic recording head and magnetic recording apparatus

Номер: US20120268844A1
Автор: Hitoshi Iwasaki, Junichi Akiyama, Kenichiro Yamada, Mariko Shimizu, Masahiro Takashita, Masayuki Takagishi, Shuichi Murakami, Tadashi Kai, Tomomi Funayama
Принадлежит: Toshiba Corp

An example magnetic writing head includes a main magnetic pole, a coil to generate an ampere magnetic field to magnetize the main magnetic pole to cause the magnetized main magnetic pole to generate a magnetic field, and a laminated body. The laminated body includes a first magnetic layer having a coercivity lower than the magnetic field applied by the main magnetic pole and a second magnetic layer having a coercivity lower than the magnetic field applied by the main magnetic pole.

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Номер записи: 44
25-10-2012 дата публикации

Magnetic Element With Dual Magnetic Moments

Номер: US20120270073A1
Автор: Mark William Covington, Qing He, Thomas Roy Boonstra
Принадлежит: SEAGATE TECHNOLOGY LLC

An apparatus and associated method may be used to provide a data sensing element capable of detecting changes in magnetic states. Various embodiments of the present invention are generally directed to a magnetically responsive lamination of layers and [a] means for generating a high magnetic moment region proximal to an air bearing surface (ABS) and a low magnetic moment region proximal to a hard magnet.

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Номер записи: 45
08-11-2012 дата публикации

Method of Forming a Plasmon Antenna with Magnetic Core for Thermally Assisted Magnetic Recording

Номер: US20120279051A1
Автор: Erhard Schreck, Joe Smyth, Kenichi Takano, Moris Dovek, Xuhui Jin, Yuchen Zhou
Принадлежит: Headway Technologies Inc

A method of forming a TAMR (Thermal Assisted Magnetic Recording) write head that uses the energy of optical-laser generated edge plasmons in a plasmon antenna to locally heat a magnetic recording medium and reduce its coercivity and magnetic anisotropy. The method incorporates forming a magnetic core within the plasmon antenna, so the antenna effectively becomes an extension of the magnetic pole and produces a magnetic field whose maximum gradient overlaps the region being heated by the edge plasmons generated in the conducting layer of the antenna surrounding the antenna's magnetic core.

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Номер записи: 46
08-11-2012 дата публикации

Optical pickup and optical information storage medium system using the same

Номер: US20120281516A1
Автор: Jin-Ho Jung
Принадлежит: Toshiba Samsung Storage Technology Korea Corp

An optical pick-up is provided. The optical pick-up includes a light source, a first objective lens configured to focus light emitted from the light source on a high-density optical information storage medium, a photo-detector configured to detect a signal by receiving light reflected from the high-density optical information storage medium, an optical-path changer configured to convert a travel path of incident light to allow the light emitted from the light source to proceed toward the high-density optical information storage medium, and to allow the light reflected from the high-density optical information storage medium to proceed toward the photo-detector, and a blocking device disposed in an optical path of signal light reflected from a target reproducing/recording layer of the high-density optical information storage medium, passes through the first objective lens, and proceeds toward the photo-detector.

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Номер записи: 47
29-11-2012 дата публикации

Thermally assisted magnetic recording medium and magnetic recording and reproducing device

Номер: US20120300600A1
Автор: Atsushi Hashimoto, Takayuki Fukushima, Tetsuya Kanbe
Принадлежит: Showa Denko KK

A thermally assisted magnetic recording medium having a structure in which a first magnetic layer 106 and a second magnetic layer 107 are formed on a substrate 101 in this order, wherein the first magnetic layer 106 has a granular structure containing a FePt alloy having a L1 0 structure, a CoPt alloy having a L1 0 crystal lattice structure or a CoPt alloy having a L1 1 crystal lattice structure, and at least one material for causing grain boundary segregation selected from the group consisting of SiO 2 , TiO 2 , Cr 2 O 3 , Al 2 O 3 , Ta 2 O 5 , ZrO 2 , Y 2 O 3 , CeO 2 , MnO, TiO, ZnO, and MgO, and the content of the material for causing grain boundary segregation in the first magnetic layer 106 is decreased from the substrate side to the second magnetic layer 107 side.

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Номер записи: 48
13-12-2012 дата публикации

Near-Field Transducers for Focusing Light

Номер: US20120314549A1
Автор: Amit Vasant Itagi, Kaizhong Gao, Lien Lee, William Albert Challener, Xuhui Jin
Принадлежит: SEAGATE TECHNOLOGY LLC

An apparatus includes a waveguide shaped to direct light to a focal point, and a near-field transducer positioned adjacent to the focal point, wherein the near-field transducer includes a dielectric component and a metallic component positioned adjacent to at least a portion of the dielectric component. An apparatus includes a waveguide shaped to direct light to a focal point, and a near-field transducer positioned adjacent to the focal point, wherein the near-field transducer includes a first metallic component, a first dielectric layer positioned adjacent to at least a portion of the first metallic component, and a second metallic component positioned adjacent to at least a portion of the first dielectric component.

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Номер записи: 49
20-12-2012 дата публикации

Thermally Assisted Magnetic Head Assembly and Magnetic Disk Device

Номер: US20120320719A1
Автор: Irizo Naniwa, Junichiro Shimizu, Satoshi Arai, Shigeyuki Sasaki, Takuya Matsumoto
Принадлежит: HITACHI LTD

A slider including a magnetic head part, an optical waveguide, and a near field element is fixed by first and second adhesives to a submount on which a semiconductor laser and a mirror are mounted, the mirror being placed at one end of the semiconductor laser in a resonance direction thereof and reflecting a laser in a direction intersecting with the resonance direction. At this time, at least parts of the first and second adhesives are applied to a position opposed to the semiconductor laser with an intermediation of the submount. The first adhesive having a higher Young's modulus than that of the second adhesive is applied onto an inflow end side of the slider including a solder connection portion, the second adhesive being applied onto an outflow end side of the slider.

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Номер записи: 50
03-01-2013 дата публикации

Method for manufacturing a magnetoresistive sensor using simultaneously formed hard bias and electrical lapping guide

Номер: US20130001187A1
Автор: Jui-Lung Li, Quang Le, Shin Funada
Принадлежит: Hitachi Global Storage Technologies Netherlands BV

A method for manufacturing a magnetic sensor using an electrical lapping guide deposited and patterned simultaneously with a hard bias structure of the sensor material. The method includes depositing a sensor material, and patterning and ion milling the sensor material to define a track width of the sensor. A magnetic, hard bias material is then deposited and a second patterning and ion milling process is performed to simultaneously define the back edge of an electrical lapping guide and a back edge of the sensor.

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Номер записи: 51
03-01-2013 дата публикации

Writing a reference pattern to bit patterned media

Номер: US20130003215A1
Автор: David Erich Tetzlaff, Puskal P. Pokharel, Rene Johannes Marinus van de Veerdonk
Принадлежит: SEAGATE TECHNOLOGY LLC

A given reference pattern is written on bit patterned media that has an initial reference pattern already disposed thereon. A write phase and frequency is detected based on the initial reference pattern and the given reference pattern is written on the bit patterned media at the detected write phase and frequency.

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Номер записи: 52
03-01-2013 дата публикации

Discrete Track Media (DTM) Design and Fabrication for Heat Assisted Magnetic Recording (HAMR)

Номер: US20130003511A1
Автор: Bin Lu, Ganping Ju, Kaizhong Gao, Michael Allen Seigler, Xuhui Jin
Принадлежит: SEAGATE TECHNOLOGY LLC

An apparatus includes a recording media including a substrate, a plurality of tracks of magnetic material on the substrate, and a non-magnetic material between the tracks; a recording head having an air bearing surface positioned adjacent to the recording media, and including a magnetic pole, an optical transducer, and a near-field transducer, wherein the near-field transducer directs electromagnetic radiation onto tracks to heat portions of the tracks and a magnetic field from the magnetic pole is used to create magnetic transitions in the heated portions of the tracks; and a plasmonic material positioned adjacent to the magnetic material to increase coupling between the electromagnetic radiation and the magnetic material.

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Номер записи: 53
10-01-2013 дата публикации

Spin-torque oscillator (sto) with magnetically damped free layer

Номер: US20130009712A1
Автор: Bruce Alvin Gurney, Patrick Mesquita Braganca
Принадлежит: Individual

A spin-torque oscillator (STO) has increased magnetic damping of the oscillating free ferromagnetic layer. The Gilbert magnetic damping parameter (a) is at least 0.05, and preferably greater than 0.05. The free layer may be a any type of conventional ferromagnetic material, but contains one or more damping elements as a dopant. The damping element is selected from the group consisting of Pt, Pd and the 15 lanthanide elements. The free layer damping may also be increased by a damping layer adjacent the free layer. One type of damping layer may be an antiferromagnetic material, like a Mn alloy. As a modification to the antiferromagnetic damping layer, a bilayer damping layer may be formed of the antiferromagnetic layer and a nonmagnetic metal electrically conductive separation layer between the free layer and the antiferromagnetic layer. Another type of damping layer may be one formed of one or more of the elements selected from Pt, Pd and the lanthanides.

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Номер записи: 54
10-01-2013 дата публикации

Optical pickup apparatus

Номер: US20130010178A1
Автор: Shinzoh Murakami
Принадлежит: Sharp Corp

There is provided an optical pickup apparatus. In an optical pickup apparatus, a focus diffraction region includes focus regions of which a number of types is equal to a number of types of light that can be emitted by a light source. The types of the focus regions correspond to the respective types of light, the respective focus regions diffract the corresponding types of light toward same positions of focus light-receiving regions. The focus regions include a plurality of focus segmented regions. The plurality of focus segmented regions of the respective types of focus regions are periodically distributed in the focus diffraction region, and at least some of the focus segmented regions are disposed to be adjacent to focus segmented regions for different types of light.

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Номер записи: 55
17-01-2013 дата публикации

Optical disk apparatus

Номер: US20130016594A1
Автор: Kenji Fujiune, Kenji Kondo, Takeharu Yamamoto
Принадлежит: Panasonic Corp

Provided is an optical disk apparatus capable achieving stable focus control or tracking control. A first detector receives reflected light from an object lens optical system, a second detector receives reflected light from a prescribed information layer, a positional deviation determination unit determines positional deviation between a focal point of a light beam and a point where information on the prescribed information layer is recorded or reproduced, on the basis of a signal from the second detector, a stray light determination unit determines a surface stray light component which is reflected light from the surface of an optical disk and is included in the signal from the positional deviation determination unit, on the basis of the signal from the first detector, and a stray light correction unit corrects the signal output from the positional deviation determination unit on the basis of the surface stray light component thus determined.

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Номер записи: 56
31-01-2013 дата публикации

Inter-track interference cancelation in the presence of frequency offset

Номер: US20130027801A1
Автор: Jason Bellorado, Kai Keung Chan, Marcus Marrow, Naveen Kumar
Принадлежит: Link A Media Devices Corp

An initial phase offset between a center track and a side track is determined. An initial side track pulse shape is determined using the initial phase offset and side track interference. The initial side track pulse shape minimizes a contribution of the side track interference to a center track bit. The contribution of the side track interference is removed from the center track bit using the initial side track pulse shape and the side track interference.

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Номер записи: 57
31-01-2013 дата публикации

Energy-assisted magnetic recording head and magnetic recording device

Номер: US20130028058A1
Автор: Harukazu Miyamoto, Kan Yasui, Masukazu Igarashi
Принадлежит: HITACHI LTD

In a case in which a microwave-assisted magnetic recording system is applied to a shingled write system for recording with high density, the width of a high-frequency generation element is narrower than a track width of main pole, and both steep parts of magnetic field gradients 24 and 25 are overlap each other by performing offset of a high-frequency magnetic field generating unit 17 of the magnetic head for shingled write from the central line of the main pole 8 in the both areas having high magnetic field gradient. At that time, a magnetic field vector 11 from the main pole 8 is perpendicular incident on a film surface of the high-frequency magnetic field generating unit by using means such as a method for arranging a shield material having high magnetic permeability so that main pole magnetic field is corrected and induced, a method for arranging a hard bias layer to which a desired static magnetic field is added, and a method for obliquely forming a high-frequency magnetic field generating unit, thereby performing stable oscillation to realize magnetic recording with high density.

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Номер записи: 58
28-02-2013 дата публикации

Cpp-gmr sensor with corrosion resistent spacer layer and higher signal/noise ratio

Номер: US20130052484A1
Автор: Jeffrey R. Childress, John C. Read, Neil Smith
Принадлежит: Individual

A method and apparatus for increasing the electrical resistivity and corrosion resistance of the material forming a spacer layer in current-perpendicular-to-the-plane (CPP) giant magnetoresistive (GMR) sensors. The increased resistivity of the spacer layer, and thus, the CPP-GMR sensor permits a larger voltage across the sensor and a higher signal-to-noise ratio. The increased corrosion resistance of the spacer layer minimizes the effects of exposing the spacer layer to corrosive materials during fabrication. For example, adding tin to silver to form a metallic alloy spacer layer increases the corrosion resistance of the spacer layer and the electrical resisitivity of the CPP-GMR sensor relative to a spacer layer consisting solely of silver. The Ag—Sn alloy permits a larger current to flow through the sensor, which increases the signal-to-noise ratio.

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Номер записи: 59
07-03-2013 дата публикации

Laser driver

Номер: US20130058368A1
Автор: Douglas W. Dean, Jeremy R. Kuehlwein
Принадлежит: Texas Instruments Inc

An apparatus is provided. The apparatus includes a lasing element, a laser driver and logic. The laser driver is configured to drive the lasing element at multiple current levels, and the laser driver includes a switching network, multiple direct current (DC) loops, and an output circuit. The switching network receives a differential input signal, and each DC loop is coupled to the switching network. The output circuit is also coupled to the lasing element, and the logic is coupled to each of the DC current loops, where the logic selects one or more of the DC loops in each (of several) modes. Each mode generates one or more output lasing currents for the lasing element that corresponds to a one or more of the current levels in response to the differential input signal.

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Номер записи: 60
07-03-2013 дата публикации

Trimethine cyanine and its use

Номер: US20130060046A1
Автор: Cheng-Fen Yang, Chin-Kang Sha, Ching-Jung Chang, Hsin-Jen Lee
Принадлежит: ORGCHEM TECHNOLOGIES Inc

The present invention relates to a trimethine cyanine represented by the formula (1): wherein all symbols are defined as in the specification.

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Номер записи: 61
28-03-2013 дата публикации

Disk drive calibrating a laser write power for heat assisted magnetic recording

Номер: US20130077453A1
Автор: Michael Alex
Принадлежит: Western Digital Technologies Inc

A disk drive is disclosed comprising a head actuated over a disk, wherein the head comprises a laser for heating the disk while writing data to the disk. The disk drive receives write commands, and increases a power of the laser to a write power for heating the disk while writing data to the disk. A calibration interval is adjusted based on the power applied to the laser over time, and the write power is calibrated at the calibration interval.

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Номер записи: 62
04-04-2013 дата публикации

Magnetization switching through magnonic spin transfer torque

Номер: US20130082798A1
Автор: Peng Yan, Xiangrong Wang, Xiansi Wang
Принадлежит: Hong Kong University of Science and Technology HKUST

The subject application describes systems and methods that drive magnetization switching through magnonic spin transfer torque. A spin current is provided to a first magnetic layer with a first magnetic state. The spin current facilitates magnetization switching via a magnonic spin transfer torque in a second magnetic layer with a second magnetic state that is separated from the first magnetic layer by an interface. Alternatively, a spin current is provided to a first magnetic domain with a first magnetic state. The spin current facilitates domain wall propagation via a magnonic spin transfer torque. The domain wall is between the first magnetic domain and a second magnetic domain in a second magnetic state.

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Номер записи: 63
04-04-2013 дата публикации

Optical elements, method of replicating optical elements, particularly on a wafer level, and optical devices

Номер: US20130083397A1
Автор: Alan Kathman, Brian Harden, Michael Feldman
Принадлежит: DigitalOptics Corp East

Integrated multiple optical elements may be formed by bonding substrates containing such optical elements together or by providing optical elements on either side of the wafer substrate. The wafer is subsequently diced to obtain the individual units themselves. The optical elements may be formed lithographically, directly, or using a lithographically generated master to emboss the elements. Alignment features facilitate the efficient production of such integrated multiple optical elements, as well as post creation processing thereof on the wafer level.

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Номер записи: 64
04-04-2013 дата публикации

Optical pickup, inclination angle detection method, optical information device and information processing device

Номер: US20130083645A1
Автор: Hidenori Wada, Keiichi Matsuzaki, Kousei Sano, Sadao Mizuno
Принадлежит: Panasonic Corp

An optical pickup, an inclination angle detection method, an optical information device, and an information processing device capable of reliably and accurately detecting a relative inclination angle between an end face of a solid immersion lens and a surface of an optical recording medium are provided. A convergence position modifying unit modifies convergence states of a first beam and a second beam according to layers of an optical recording medium, a first optical detector includes a first light receiving section which receives the converged first beam and a second light receiving section which receives the converged second beam, and the first optical detector detects a relative inclination angle between an end face of a solid immersion lens and a surface of the optical recording medium based on a difference in quantities of received light between the first light receiving section and the second light receiving section.

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Номер записи: 65
11-04-2013 дата публикации

CPP Device with Improved Current Confining Structure and Process

Номер: US20130088797A1
Автор: Kunliang Zhang, Min Li, Yue Liu
Принадлежит: Headway Technologies Inc

Plasma nitridation, in place of plasma oxidation, is used for the formation of a CCP layer. Al, Mg, Hf, etc. all form insulating nitrides under these conditions. Maintaining the structure at a temperature of at least 150° C. during plasma nitridation and/or performing post annealing at a temperature of 220° C. or higher, ensures that no copper nitride can form. Additionally, unintended oxidation by molecular oxygen of the exposed magnetic layers (mainly the pinned and free layers) is also avoided

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Номер записи: 66
18-04-2013 дата публикации

Method of manufacturing a thermally-assisted magnetic recording head that suppresses protrusion of a plasmon generator

Номер: US20130091695A1
Автор: Koji Shimazawa, Tatsuya Shimizu, Yasutoshi Fujita
Принадлежит: SAE Magnetics HK Ltd, TDK Corp

A method of manufacturing a thermally-assisted magnetic recording head includes the steps of: forming a preliminary head section that has a surface to be polished and includes a magnetic pole, a waveguide, and a preliminary plasmon generator; causing a volumetric expansion of the preliminary plasmon generator with heat by introducing light into the core of the waveguide of the preliminary head section; and polishing the surface to be polished of the preliminary head section into a medium facing surface. The preliminary plasmon generator has an end face located in the surface to be polished. In the step of polishing the surface to be polished, the surface to be polished is subjected to polishing with the preliminary plasmon generator expanded in volume, whereby the end face of the preliminary plasmon generator is polished into the front end face, and the preliminary plasmon generator thereby becomes the plasmon generator.

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Номер записи: 67
25-04-2013 дата публикации

Magnetic nano-multilayers for magnetic sensors and manufacturing method thereof

Номер: US20130099780A1
Автор: Houfang Liu, Qinli Ma, Xiufeng Han
Принадлежит: Institute of Physics of CAS

The invention discloses a magnetic nano-multilayers structure and the method for making it. The multilayer film includes—sequentially from one end to the other end—a substrate, a bottom layer, a magnetic reference layer, a space layer, a magnetic detecting layer and a cap layer. The, up-stated structure is for convert the information of the rotation of the magnetic moment of the magnetic detecting layer into electrical signals. The magnetic detecting layer is of a pinning structure to react to the magnetic field under detection. On the other hand, the invention sandwiches an intervening layer between the AFM and the FM to mitigate the pinning effect from the exchange bias. Moreover, the thickness of the intervening layer is adjustable to control the pinning effect from the exchange bias. The controllability ensures that the magnetic moments of the magnetic reference layer and the magnetic detecting layer remain at right angles to each other when the external field is zero. The invention achieves a GMR or TMR magnetic sensor exhibiting a linear response and by tuning the thickness of the non-magnetic metallic layer, the sensitivity as well as the detecting range of the devices can be tuned easily.

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Номер записи: 68
02-05-2013 дата публикации

Magnetic head, magnetic sensor, and magnetic recording/reproducing apparatus

Номер: US20130107395A1
Автор: Hirofumi Suto, Kiwamu Kudo, Koichi Mizushima, Rie Sato, Tao Yang, Tazumi Nagasawa
Принадлежит: Individual

A magnetic head according to an embodiment includes: a spin-torque oscillator comprising a first ferromagnetic layer, a second ferromagnetic layer, a third ferromagnetic layer provided on the opposite side of the second ferromagnetic layer from the first ferromagnetic layer, a first nonmagnetic layer provided between the first ferromagnetic layer and the second ferromagnetic layer, a second nonmagnetic layer provided between the second ferromagnetic layer and the third ferromagnetic layer, a first electrode provided on a surface on the opposite side of the first ferromagnetic layer from the first nonmagnetic layer, and a second electrode provided on a surface on the opposite side of the third ferromagnetic layer from the second nonmagnetic layer. Magnetization precession is induced in each of the first through third ferromagnetic layers when current is applied between the first and second electrodes.

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Номер записи: 69
16-05-2013 дата публикации

Optical information recording medium and method for manufacturing same

Номер: US20130121127A1
Автор: Toshiyuki Kitahara
Принадлежит: Fujifilm Corp

An optical information recording medium 10 comprises: a plurality of recording layers 14 , each of which undergoes a change in a refractive index by irradiation with a recording beam; and at least one intermediate layer 15 provided between the plurality of recording layers 14 . The recording layer 14 and the intermediate layer 15 have different refractive indices, and, among interfaces between the plurality of recording layers 14 and the at least one intermediate layer 15 , a recording layer 14 and an intermediate layer 15 disposed adjacent to the recording layer 14 at an incident side from which the recording beam enters the recording layer 14 are merged with each other at an interface (near-side interface 19 ) therebetween, whereby a refractive index gradually changes at the interface.

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Номер записи: 70
23-05-2013 дата публикации

Medium, method of fabricating a medium, recording system and method of controlling a recording system

Номер: US20130128378A1
Автор: BO LIU, Jianzhong Shi, Weidong Zhou, Zhimin Yuan
Принадлежит: Agency for Science Technology and Research Singapore

A medium may be provided. The medium includes a servo layer, a data recording layer, and a heat sink layer disposed between the servo layer and the recording layer.

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Номер записи: 71
13-06-2013 дата публикации

Implementing spin-torque oscillator sensing with enhanced demodulator for hard disk drives

Номер: US20130148223A1
Автор: Bruce Alvin Gurney, Bruce Wilson, Neil Smith, Patrick Mesquita Braganca, Rehan Ahmed Zakai, Richard Leo Galbraith
Принадлежит: Hitachi Global Storage Technologies Netherlands BV

A method, apparatus, and system are provided for implementing spin-torque oscillator (STO) sensing with a demodulator for hard disk drives. The demodulator measures an instantaneous phase of the readback signal from a STO sensor and converts the readback signal into a signal that is proportional to the magnetic field affecting the STO frequency during a bit time. The converted signal is used for processing by conventional data detection electronics.

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Номер записи: 72
13-06-2013 дата публикации

Implementing spin-torque oscillator sensing with enhanced delay control feedback circuit for hard disk drives

Номер: US20130148229A1
Автор: Bruce Alvin Gurney, Bruce Wilson, Neil Smith, Patrick Mesquita Braganca, Rehan Ahmed Zakai, Richard Leo Galbraith
Принадлежит: Hitachi Global Storage Technologies Netherlands BV

A method, apparatus, and system for implementing spin-torque oscillator (STO) sensing with an enhanced delay control feedback circuit for hard disk drives. A detector receives an input signal from a STO read sensor having an oscillation frequency related to the strength of the detected magnetic signal field. The received input signal is mixed with a time delayed input signal for providing a detector output signal. A low frequency component signal of the detector output signal is monitored and a delay control feedback is applied to an adjustable time delay to bias the DC signal of the detector output signal.

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Номер записи: 73
13-06-2013 дата публикации

Optical information storage medium reproduction apparatus and control method of the same

Номер: US20130148486A1
Автор: Go Mori, Hideharu Tajima, Hirohisa Yamada, Masaki Yamamoto, Shigemi Maeda, Yasuhiro Harada, Yoshiteru Murakami
Принадлежит: Sharp Corp

In an optical information storage medium reproduction apparatus ( 10 ) for reproducing an optical information storage medium including a plurality of information recording layers each including a recording mark having a length shorter than an optical system resolution limit, reproduction laser power for reading an information recording layer closest to a reproduction-laser-incident surface of the optical information storage medium is set to be lower than reproduction laser power for reading an information recording layer farthest from the reproduction-laser-incident surface but not lower than minimum reproduction laser power that satisfies a reproduction signal characteristic that the optical information storage medium reproduction apparatus ( 10 ) requires. With the arrangement, it is possible to prevent that the information recording layer closest to the reproduction-laser-incident surface is irradiated wrongly with reproduction laser having high reproduction laser power, thereby making it possible to obtain successful reproduction quality. That is, it is possible to realize the optical information storage medium reproduction apparatus ( 10 ) that can set optimum reproduction laser power and perform stable super resolution reproduction.

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Номер записи: 74
13-06-2013 дата публикации

Magnetic Element with Dual Magnetic Moments

Номер: US20130149559A1
Автор: Mark William Covington, Qing He, Thomas Roy Boonstra
Принадлежит: SEAGATE TECHNOLOGY LLC

An apparatus and associated method may be used to provide a data sensing element capable of detecting changes in magnetic states. Various embodiments of the present invention are generally directed to a magnetically responsive lamination of layers and [a] means for generating a high magnetic moment region proximal to an air bearing surface (ABS) and a low magnetic moment region proximal to a hard magnet.

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Номер записи: 75
20-06-2013 дата публикации

Optical disc device and optical disc recording method

Номер: US20130155824A1
Автор: Tomomi Okamoto
Принадлежит: Hitachi Consumer Electronics Co Ltd

On the occasion of providing a guard track and additionally recording data in an optical disc provided with a guide layer having a physical groove structure for carrying out tracking servo control and not having a land/groove structure in recording layers carrying out recording and playback, it has sometimes occurred that it was difficult to reposition a light spot. Given that there are a recorded area and an unrecorded area in a recording layer, recording with respect to the concerned recording layer is taken to be impossible to implement when the recording capacity of the unrecorded area is less than a prescribed value.

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Номер записи: 76
27-06-2013 дата публикации

Magnetic head having high-frequency oscillatory elements and disk drive with the same

Номер: US20130163122A1
Автор: Katsuhiko Koui, Kenichiro Yamada, Masaya Ohtake, Masayuki Takagishi, Tomoko Taguchi
Принадлежит: Toshiba Corp

According to one embodiment, a magnetic head includes a main pole configured to apply a perpendicular recording magnetic field to a recording layer of a recording medium, a return pole opposed to the trailing side of the main pole with a write gap therebetween and configured to reflux magnetic flux from the main pole to form a magnetic circuit in conjunction with the main pole, a coil configured to excite magnetic flux in the magnetic circuit includes the main pole and the return pole, a plurality of high-frequency oscillatory elements individually interposed between the main pole and the return pole, includes a plurality of magnetic films different in magnetic resonance frequency, and configured to individually apply high-frequency magnetic fields to the recording medium, and an electrical circuit configured to energize the high-frequency oscillatory elements.

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Номер записи: 77
04-07-2013 дата публикации

Objective lens element

Номер: US20130170042A1
Автор: Katsuhiko Hayashi, Michihiro Yamagata, Yasuhiro Tanaka, Yoshiaki Komma
Принадлежит: Panasonic Corp

An objective lens element having excellent compatibility with optical discs having different base material thicknesses is provided. The objective lens element has optically functional surfaces on an incident side and an exit side. At least either one of the optically functional surfaces on the incident side and the exit side includes a diffraction portion which satisfies at least either one of the following formulas (1) and (2): θ 1 ×θ 2 <0 (“×” represents multiplication)  (1), (sin θ 2 )/λ 2 =−(sin θ 1 )/λ 1   (2), where θ 1 is the diffraction angle of a light beam having a diffraction order providing the maximum diffraction efficiency at the wavelength λ 1 , and θ 2 is the diffraction angle of a light beam having a diffraction order providing the maximum diffraction efficiency at the wavelength λ 2 .

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Номер записи: 78
11-07-2013 дата публикации

Magnetic disk device, magnetic disk evaluation apparatus, and magnetic head

Номер: US20130176835A1
Автор: Tomoko Taguchi, Yoshinobu FUCHIZAKI, Yuuichi Yamada
Принадлежит: Toshiba Corp

A magnetic disk device of an embodiment includes a magnetic disk, a magnetic head, a laser-beam-intensity control unit, a reproduced-signal detecting unit, and a magnetic-disk evaluating unit. The magnetic head reads a signal recorded in the magnetic disk, or performs magnetic recording while irradiating a laser beam onto the magnetic disk. The laser-beam-intensity control unit controls the intensity of the laser beam. The reproduced-signal detecting unit detects the signal read by the magnetic head. The magnetic-disk evaluating unit evaluates the signal read from the magnetic head, on the basis of a relation between a noise level detected from the signal read by the magnetic head, and the intensity of the laser beam.

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Номер записи: 79
11-07-2013 дата публикации

Light delivery guide

Номер: US20130176839A1
Автор: Chubing Peng
Принадлежит: SEAGATE TECHNOLOGY LLC

A waveguide that includes a first cladding layer, the first cladding layer having an index of refraction, n 3 ; a gradient index layer positioned adjacent the first cladding layer; an assist layer positioned adjacent the gradient index layer, the assist layer having an index of refraction, n 2 ; a core layer positioned adjacent the assist layer, the core layer having an index of refraction, n 1 ; and a second cladding layer, the second cladding layer having an index of refraction, n 4 , wherein n 1 is greater than n 2 , n 3 , and n 4 ; and n 2 is greater than n 3 and n 4 .

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Номер записи: 80
05-09-2013 дата публикации

Magnetic head, magnetic recording method and apparatus for controlling magnetic head with spin torque oscillator in a disk drive

Номер: US20130229895A1
Автор: Harukazu Miyamoto, Hiroshi Fukuda, Junko Ushiyama, Katsuro Watanabe, Masukazu Igarashi, Yoshihiro Shiroishi, Yoshiyuki Hirayama
Принадлежит: HITACHI LTD

A microwave assisted magnetic recording head includes a recording magnetic pole unit that produces a recording field for writing to a perpendicular magnetic recording medium, and a high-frequency magnetic field oscillator that produces a high-frequency magnetic field. The recording magnetic pole unit includes a magnetic core with a write gap portion at which a main recording field component is concentrated, and the high-frequency magnetic field oscillator is disposed in the write gap.

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Номер записи: 81
05-09-2013 дата публикации

Light delivery waveguide

Номер: US20130230279A1
Автор: Chubing Peng, Edward Charles Gage, Kalman Pelhos
Принадлежит: SEAGATE TECHNOLOGY LLC

A light source and a waveguide are mounted on a recording head slider. Light rays are emitted from the light source into the waveguide. The waveguide may include two core layers for light ray transmission. The first core layer enhances light coupling efficiency from the light source to the second core layer. The second core layer transforms a profile of the light. The waveguide may include a tapered portion with a narrow opening near the light source and a wider opening near the tapered portion exit. The light rays passing through the waveguide may be directed toward a collimating mirror. The collimating mirror makes the light rays parallel or nearly parallel and re-directs the light rays to a focusing mirror. The focusing mirror focuses the collimated light rays to a spot on a magnetic media disc.

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Номер записи: 82
12-09-2013 дата публикации

Hamr nft materials with improved thermal stability

Номер: US20130235707A1
Автор: Michael Allen Seigler, Michael Christopher Kautzky, TONG Zhao, William Albert Challener
Принадлежит: SEAGATE TECHNOLOGY LLC

A near field transducer includes gold and at least one dopant. The dopant can include at least one of: Cu, Rh, Ru, Ag, Ta, Cr, Al, Zr, V, Pd, Ir, Co, W, Ti, Mg, Fe, or Mo. The dopant concentration may be in a range from 0.5% and 30%. The dopant can be a nanoparticle oxide of V, Zr, Mg, Ca, Al, Ti, Si, Ce, Y, Ta, W, or Th, or a nitride of Ta, Al, Ti, Si, In, Fe, Zr, Cu, W or B.

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Номер записи: 83
24-10-2013 дата публикации

Near field transducers including nitride materials

Номер: US20130279315A1
Автор: Amit Vasant Itagi, Michael Christopher Kautzky, Sarbeswar Sahoo, TONG Zhao
Принадлежит: SEAGATE TECHNOLOGY LLC

An apparatus that includes a near field transducer, the near field transducer including an electrically conductive nitride.

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Номер записи: 84
31-10-2013 дата публикации

Magnetic recording medium and magnetic memory device

Номер: US20130286505A1
Автор: Hiroshi Fukuda, Yoshihiro Shiroishi
Принадлежит: HITACHI LTD

There are provided a magnetic recording medium and a magnetic memory device capable of implementing high recording density, in the case of using a microwave assisted magnetic recording (MAMR) scheme. In a magnetic memory device including a magnetic recording medium having a recording film with three or more layers, a recording magnetic pole generating a recording magnetic field, an opposed magnetic pole, a high frequency magnetic field generating element generating a microwave for recording assist, and a magnetic reproduction element, an anisotropic field of a first layer which is a top layer of the recording film is larger than 20 kOe.

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Номер записи: 85
07-11-2013 дата публикации

Light Source Power Control for Heat Assisted Magnetic Recording (HAMR)

Номер: US20130294207A1
Автор: Darren W. Karns, Edward Charles Gage, Kaizhong Gao, Mehmet Fatih Erden, Yimin Niu
Принадлежит: SEAGATE TECHNOLOGY LLC

Apparatus and method for light source power control during the writing of data to a storage medium. In accordance with various embodiments, a data recording head is provided having a magnetic transducer and a light source. The light source is driven at a first power level to irradiate an adjacent storage medium prior to the writing if data to the medium using the magnetic transducer. The first power level is insufficient to alter a magnetization state of the medium. The light source is subsequently transitioned to a higher, second power level to irradiate the storage medium during the writing of data to said medium using the magnetic transducer, the second power level being sufficient to alter said magnetization state of the medium.

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Номер записи: 86
28-11-2013 дата публикации

Recording head and disk device including the same

Номер: US20130314818A1
Автор: Kenichiro Yamada, Noayuki Narita, Takuya Maatsumoto
Принадлежит: Individual

A recording head includes a main magnetic pole generating a recording magnetic field in a direction perpendicular to a recording medium, a write shield magnetic pole facing a trailing side of the main magnetic pole, a recording coil exciting a magnetic flux in a magnetic circuit, and a spin torque oscillator provided between the main magnetic pole and the write shield magnetic pole. The main magnetic pole includes a trailing side end surface that faces the spin torque oscillator and is tilted toward a leading side of the recording head with respect to the direction perpendicular to the recording medium, and the spin torque oscillator has layers with tilted surfaces that are substantially in parallel with the trailing side end surface.

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Номер записи: 87
05-12-2013 дата публикации

Optical information recording medium and reproducing apparatus

Номер: US20130322222A1
Автор: Hideki Ando, Satoru Higashino, Toshihiro Horigome
Принадлежит: Sony Corp

An optical information recording medium on which recording address information is performed by a CAV or a zone CAV system, wherein a groove wobbling continuously is formed in advance to record the information to the groove and a land abutting the groove, the address information is recorded by a wobble where a plurality of modulated waves modulated by the address information are multiply formed, the modulated wave is a higher harmonic wave whose frequency is a fundamental wave of the fundamental frequency of the wobble, or an integer times the fundamental frequency of the wobble, one modulated wave is modulated by the address information of one land of the abutting lands which interpose the groove, and the other modulated wave is modulated by the address information of the other land of the abutting lands which interpose the groove.

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Номер записи: 88
26-12-2013 дата публикации

Recording head for heat assisted magnetic recording with diffusion barrier surrounding a near field transducer

Номер: US20130343167A1
Автор: Jie Zou, Kaizhong Gao, Mark Henry Ostrowski, Michael Christopher Kautzky, TONG Zhao, Venkateswara Rao Inturi, William Albert Challener
Принадлежит: SEAGATE TECHNOLOGY LLC

An apparatus includes a near field transducer positioned adjacent to an air bearing surface, a first magnetic pole, a heat sink positioned between the first magnetic pole and the near field transducer, and a diffusion barrier positioned between the near field transducer and the first magnetic pole. The diffusion barrier can be positioned adjacent to the magnetic pole or the near field transducer.

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Номер записи: 89
09-01-2014 дата публикации

Information storage medium, reproducing method, and recording method

Номер: US20140010060A1
Автор: Hideo Ando, Koji Takazawa, Seiji Morita
Принадлежит: Toshiba Corp

A machine readable information storage medium, a reproducing method and apparatus which reproduces data from the storage medium, and a recording method and apparatus for recording data on the storage medium. The information storage medium includes a control area which stores within a data structure information usable by the recording or reproducing apparatus to record or reproduce the data on or from the storage medium. The information stored within the data structure includes a version corresponding to a specification, a revision number of recording speed, and an extended part version field.

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Номер записи: 90
09-01-2014 дата публикации

Information storage medium, reproducing method, and recording method

Номер: US20140010063A1
Автор: Hideo Ando, Koji Takazawa, Seiji Morita
Принадлежит: Toshiba Corp

A machine readable information storage medium, a reproducing method and apparatus which reproduces data from the storage medium, and a recording method and apparatus for recording data on the storage medium. The information storage medium includes a control area which stores within a data structure information usable by the recording or reproducing apparatus to record or reproduce the data on or from the storage medium. The information stored within the data structure includes a version corresponding to a specification, a revision number of recording speed, and an extended part version field.

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Номер записи: 91
09-01-2014 дата публикации

Perpendicular Magnetic Recording Media with Magnetic Anisotropy Gradient and Local Exchange Coupling

Номер: US20140011053A1
Автор: Kaizhong Gao, Lei Wang, Shaoping Li, Wenzhong Zhu, Xiaobin Wang
Принадлежит: SEAGATE TECHNOLOGY LLC

A perpendicular magnetic recording medium adapted for high recording density and high data recording rate comprises a non-magnetic substrate having at least one surface with a layer stack formed thereon, the layer stack including a perpendicular recording layer containing a plurality of columnar-shaped magnetic grains extending perpendicularly to the substrate surface for a length, with a first end distal the surface and a second end proximal the surface, wherein each of the magnetic grains has: (1) a gradient of perpendicular magnetic anisotropy field H k extending along its length between the first end and second ends; and (2) predetermined local exchange coupling strengths along the length.

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Номер записи: 92
06-02-2014 дата публикации

Microwave assisted magnetic recording head having spin torque oscillator, and magnetic recording apparatus

Номер: US20140036387A1
Автор: Katsuro Watanabe, Keizou Katou, Masukazu Igarashi, Yo Sato
Принадлежит: HITACHI LTD

To provide a spin torque oscillator which is adapted to high data transfer rates and which can perform assisted magnetic recording of sufficient magnitude. A spin torque oscillator is provided with a stacked spin injection layer and a high frequency magnetic field generation layer. The stacked spin injection layer has a stacked structure in which a first magnetic layer, a coupling layer, and a second magnetic layer are stacked in the order mentioned from a far side as viewed from the high frequency magnetic field generation layer. Magnetization of the first magnetic layer and magnetization of the second magnetic layer are coupled antiparallel to each other. A polarity of the magnetization of the second magnetic layer is reversed temporally earlier than a magnetic field polarity reversal of a leakage magnetic field from the main magnetic pole.

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Номер записи: 93
20-02-2014 дата публикации

Optical disc and optical disc device

Номер: US20140050059A1
Автор: Hironori Nakahara, Masaharu Ogawa, Nobuo Takeshita
Принадлежит: Mitsubishi Electric Corp

In a multilayer optical disc having information layers conforming to a plurality of different optical disc standards, because the type of each information layer is not recorded in the other information layers, in read and write operations by a compatible optical disc device conforming to a plurality of optical disc standards, every time the information layer being accessed changes, it has been necessary to read the type of the information layer and select a method of generating a tracking error signal adapted to the type of information layer, so access has taken time. In order to solve the above problem, in the optical multilayer disc according to the present invention, having information layers conforming to a plurality of different optical disc standards, in an area in one of the information layers, information about the other information layers is recorded. The time required to access the other information layers can be reduced by using this information to select a tracking error signal generating method.

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Номер записи: 94
20-02-2014 дата публикации

Optical disc and optical disc device

Номер: US20140050065A1
Автор: Hironori Nakahara, Masaharu Ogawa, Nobuo Takeshita
Принадлежит: Mitsubishi Electric Corp

In a multilayer optical disc having information layers conforming to a plurality of different optical disc standards, because the type of each information layer is not recorded in the other information layers, in read and write operations by a compatible optical disc device conforming to a plurality of optical disc standards, every time the information layer being accessed changes, it has been necessary to read the type of the information layer and select a method of generating a tracking error signal adapted to the type of information layer, so access has taken time. In order to solve the above problem, in the optical multilayer disc according to the present invention, having information layers conforming to a plurality of different optical disc standards, in an area in one of the information layers, information about the other information layers is recorded. The time required to access the other information layers can be reduced by using this information to select a tracking error signal generating method.

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Номер записи: 95
20-02-2014 дата публикации

Optical disc and optical disc device

Номер: US20140050071A1
Автор: Hironori Nakahara, Masaharu Ogawa, Nobuo Takeshita
Принадлежит: Mitsubishi Electric Corp

In a multilayer optical disc having information layers conforming to a plurality of different optical disc standards, because the type of each information layer is not recorded in the other information layers, in read and write operations by a compatible optical disc device conforming to a plurality of optical disc standards, every time the information layer being accessed changes, it has been necessary to read the type of the information layer and select a method of generating a tracking error signal adapted to the type of information layer, so access has taken time. In order to solve the above problem, in the optical multilayer disc according to the present invention, having information layers conforming to a plurality of different optical disc standards, in an area in one of the information layers, information about the other information layers is recorded. The time required to access the other information layers can be reduced by using this information to select a tracking error signal generating method.

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Номер записи: 96
20-02-2014 дата публикации

Optical disc and optical disc device

Номер: US20140050072A1
Автор: Hironori Nakahara, Masaharu Ogawa, Nobuo Takeshita
Принадлежит: Mitsubishi Electric Corp

In a multilayer optical disc having information layers conforming to a plurality of different optical disc standards, because the type of each information layer is not recorded in the other information layers, in read and write operations by a compatible optical disc device conforming to a plurality of optical disc standards, every time the information layer being accessed changes, it has been necessary to read the type of the information layer and select a method of generating a tracking error signal adapted to the type of information layer, so access has taken time. In order to solve the above problem, in the optical multilayer disc according to the present invention, having information layers conforming to a plurality of different optical disc standards, in an area in one of the information layers, information about the other information layers is recorded. The time required to access the other information layers can be reduced by using this information to select a tracking error signal generating method.

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Номер записи: 97
03-04-2014 дата публикации

Recording film for optical information recording medium, optical information recording medium, and sputtering target used to form said recording film

Номер: US20140093672A1
Автор: Yoko Shida, Yuki Tauchi
Принадлежит: Kobe Steel Ltd

Provided is a recording film for an optical information recording medium with which it is possible to meet all predetermined characteristics requirements and increase productivity while reducing the number of layers in the optical information recording medium. The present invention relates to a recording film for an optical information recording medium on which recording is performed by laser light irradiation, wherein the recording film for an optical information recording medium includes: Mn; at least one element (group X element) selected from the group consisting of Bi, Ag, Co, Cu, In, Sn, and Zn (group X); and oxygen (O). At least some of the Mn and at least some of the group X element are oxidized.

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Номер записи: 98
03-04-2014 дата публикации

Polycarbonate composition to produce optical quality products with high quality and good processability

Номер: US20140093673A1
Автор: Cornelis Jan Maria Rijken, David DEL AGUA HERNANDEZ, Ignacio Vic Fernandez
Принадлежит: SABIC Global Technologies BV

The present disclosure relates to thermoplastic compositions, methods of making thermoplastic compositions, and articles made from thermoplastic compositions. The disclosed compositions comprise a polycarbonate polymer, a triacylglyceride release agent, and a monoacylglyceride release agent. In an embodiment, the thermoplastic composition comprises: greater than 90 weight percent based on the total weight of the composition of a melt polycarbonate polymer; a triacylglyceride release agent; and a monoacylglyceride release agent. The total amount of triacylglyceride release agent and the monoacylglyceride release agent is 0.01 to 0.5 weight percent based on the total weight of the composition.

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Номер записи: 99
06-01-2022 дата публикации

Magnetoresistive Element, Magnetic Sensor, Reproducing Head, and Magnetic Recording and Reproducing Device

Номер: US20220005499A1
Автор: FATHONI Kresna Bondan, HONO Kazuhiro, Miura Yoshio, Nakatani Tomoya, SAKURABA Yuya, Sasaki Taisuke
Принадлежит: NATIONAL INSTITUTE FOR MATERIALS SCIENCE

The present disclosure provides: a magnetoresistive element having a large magnetoresistance change ratio (MR ratio); and a magnetic sensor, a reproducing head and a magnetic recording and reproducing device. 1: A magnetoresistive device comprising a magnetoresistive film , wherein:the magnetoresistive film is provided with at least a pair of ferromagnetic layers and a non-magnetic layer positioned between the pair of ferromagnetic layers;{'sub': 100-p', 'p, 'each of the pair of ferromagnetic layers is a layer having a body-centered cubic (bcc) crystal structure and being represented by a general formula: CoFe(wherein the parameter p satisfies a value in a range of 0≤p≤75, and the ferromagnetic layers constituting the pair have a same value for the parameter p each other or a different value for the parameter p each other);'}the non-magnetic layer is a layer having a body-centered cubic (bcc) crystal structure and being composed of Cu; andeach of the pair of ferromagnetic layers and the non-magnetic layer is a single crystal (001)-oriented layer or is preferentially oriented on a (001) crystal plane.2: The magnetoresistive device according to claim 1 , wherein the parameter p satisfies a value in a range of 0≤p≤70.3: The magnetoresistive device according to claim 2 , wherein the parameter p satisfies a value in a range of p=0 or 22≤p≤70.4: The magnetoresistive device according to claim 2 , wherein the parameter p satisfies a value in a range of 0≤p≤65.5: The magnetoresistive device according to claim 4 , wherein the parameter p satisfies a value in a range of p=0 or 25≤p≤65.6: The magnetoresistive device according to claim 1 , wherein the non-magnetic layer has a thickness in a range of 1.5 nm or more and 5 nm or less.7: The magnetoresistive device according to claim 1 , wherein each of the ferromagnetic layers constituting the pair has a thickness in a range of 1.5 nm or more and 15 nm or less.8: The magnetoresistive device according to claim 1 , wherein the ...

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Номер записи: 100