Magneto-optic disk exhibiting a phase shift between plus and minus twelve degrees and a reflectivity between fifteen and twenty-five percent

An optimal structure for a quadrilayer magneto-optic data storage medium is described. The structure has superior characteristics of signal to noise, reflectivity, ellipticity, write sensitivity, and stability.

Data storage disk having improved tracking capability

In the present invention a magnetic data storage includes disk recesses formed in the magnetic layer. The recesses are located in pairs on opposite sides of the data tracks, and the disk is initialized by applying a magnetic field perpendicular and parallel to the surface of the disk, thereby forming positive magnetic poles at respective edges of the recesses. The read/write head generates a signal as it passes over the pairs of recesses, and this signal is used to adjust the position of the head with respect to the data track. The recesses may advantageously be arranged in a stair step pattern which results in a signal having the same sequential characteristics for adjacent data tracks. The spacing between the recesses may be used to represent ROM data or header information, such as track addresses or synchronization marks.

Laser disk texturing apparatus

Formation of laser texture features simultaneously on the target surfaces of each side of magnetic recording disk is facilitated by optical and mechanical components permitting excellent balance of optical power between each target surface, excellent matching of the radial position of laser texture features between each target surface, and excellent focusing of laser beams on each target surface. Polarization of the source laser beam may be used to controllably balance and direct a single source beam into individual beam paths for each target surface. Handling, automation complexity, and manufacturing time is thereby reduced.

Method for laser texturing a glass ceramic substrate and the resulting substrate

A method for texturing a glass ceramic substrate comprising the steps of applying a laser pulse to the substrate such that a portion of said substrate is heated to a temperature higher than the glass transition temperature of the glass phase of said substrate but lower than the melting point of the crystal phase of said substrate.

Laser textured magnetic disk comprising NiNb

A method for manufacturing a magnetic disk comprises the steps of depositing NiP (20) on a substrate (22); depositing NiNb (24) on the NiP; and laser texturing the NiNb. "Sombrero" shaped texture features are more easily formed on the substrate/NiP/NiNb structure than a substrate/NiP structure. The disk is completed by depositing an underlayer (e.g. sputtered Cr or NiP), a magnetic layer (e.g. a Co alloy) and a protective overcoat (e.g. by hydrogenated carbon).

Calibration disk having discrete bands of calibration bumps

A calibration disk for calibrating the fly height of a head, includes spaced circumferencial bands on the disk extending in a concentric fashion from adjacent an outer diameter of the disk to near an inner diameter of the disk. Each of the bands include radial and circumferencial spaced asperity emulating bumps having a population sufficient to produce a constant and continuous output signal from a glide head when the glide head flies lower than a maximum height of the bumps. The height of the bumps within individual bands are substantially uniform, and the average heights of the bumps in each band differ from each other. The configuration of the bumps on the calibration disk advantageously avoids errors caused by disk waviness, runout, and contamination. Further, using the differing heights of the bumps on the calibration disk, a glide head can be calibrated on the glide tester without using an independent fly height measurements for the glide head. Thus, errors in the fly height measurement ...

Laser disk texturing apparatus

Reflection of a generated radiation beam (e.g., laser) from a disk substrate during radiation-induced texturing such that the reflection interferes with the generated radiation beam is eliminated as follows: the beam path of the laser beam is passed through focusing optics to focus the beam to a spot on the substrate surface; the beam path is offset from the center of the focusing optics so that the focusing optics bend the beam path, and further so that the beam is angled from normal to the surface of the disk, for example by between 2 and 5 degrees; and that portion of the beam reflected by the disk surface is blocked by appropriate means prior to its impinging upon the source of the generated radiation beam.

Magnetic discrete track recording disk

A method of forming a discrete track recording pattern in a magnetic recording disk. In one embodiment, the discrete track recording pattern may be formed in a NiP layer continuous throughout the discrete track recording pattern. Alternatively, the discrete track recording pattern may be formed in a substrate.

Perpendicular magnetic discrete track recording disk

A method of forming a discrete track recording pattern on a soft magnetic underlayer of a perpendicular magnetic recording disk. In one embodiment, the soft magnetic underlayer is continuous throughout the discrete track recording pattern.

Method of fabricating a magnetic discrete track recording disk

A method of forming a discrete track recording pattern in a magnetic recording disk. In one embodiment, the discrete track recording pattern may be formed in a NiP layer continuous throughout the discrete track recording pattern. Alternatively, the discrete track recording pattern may be formed in a substrate.

Perpendicular magnetic discrete track recording disk

A method of forming a discrete track recording pattern on a soft magnetic underlayer of a perpendicular magnetic recording disk. In one embodiment, the soft magnetic underlayer is continuous throughout the discrete track recording pattern.

Perpendicular magnetic discrete track recording disk

A method of forming a discrete track recording pattern on a soft magnetic underlayer of a perpendicular magnetic recording disk. In one embodiment, the soft magnetic underlayer is continuous throughout the discrete track recording pattern.

Perpendicular magnetic recording disk with a soft magnetic layer having a discrete track recording pattern

A method of forming a discrete track recording pattern on a soft magnetic underlayer of a perpendicular magnetic recording disk. In one embodiment, the soft magnetic underlayer is continuous throughout the discrete track recording pattern.

Imprinting method with embossing foil free to expand for nano-imprinting of recording media

An imprinting method is described. The imprinting method including clamping a portion of an embossing foil to a first die of a die press with a spring tensioned clamp, receiving a magnetic recording disk in the die press, and pressing the embossing foil against the magnetic recording disk to emboss a side of the magnetic recording disk with a discrete track recording pattern.

Laser disk texturing apparatus

REFLECTION (21) OF A GENERATED RADIATION BEAM (20) (E.G., LASER) FROM A DISK SUBSTRATE (24) DURING RADIATION-INDUCED TEXTURING SUCH THAT THE REFLECTION (21) INTERFERES WITH THE GENERATED RADIATION BEAM (20) IS ELIMINATED AS FOLLOWS: THE BEAM PATH OF THE LASER BEAM (20) IS PASSED THROUGH FOCUSING OPTICS (22) TO FOCUS THE BEAM (20) TO A SPOT ON THE SUBSTRATE SURFACE (24); THE BEAM (20) PATH IS OFFSET FROM THE CENTER OF THE FOCUSING OPTICS (22) SO THAT THE FOCUSING OPTICS (22) BEND THE BEAM (20) PATH, AND FURTHER SO THAT THE BEAM (20) IS ANGLED FROM NORMAL TO THE SURFACE OF THE DISK (24), FOR EXAMPLE BY BETWEEN 2 AND 5 DEGREES; AND THAT PORTION OF THE BEAM REFLECTED (21) BY THE DISK SURFACE (24) IS BLOCKED BY APPROPRIATE MEANS PRIOR TO ITS IMPINGING UPON THE SOURCE (12) OF THE GENERATED RADIATION BEAM (20).FIGURE 4B

Magnetic discrete track recording disk

A method of forming a discrete track recording pattern in a magnetic recording disk. In one embodiment, the discrete track recording pattern may be formed in a NiP layer continuous throughout the discrete track recording pattern. Alternatively, the discrete track recording pattern may be formed in a substrate.

Producing magnetic recording layer in hard disk, comprises arranging a magnetic recording layer on a substrate, and forming a discrete trace recording structure on the substrate

Production of a magnetic recording plate comprises arranging a magnetic recording layer on a substrate, and forming a discrete trace recording structure on the substrate. Independent claims are also included for: (a) magnetic recording layer produced by the above process; (b) process for the production of a magnetic recording layer; (c) device comprising a unit for arranging a Ni-P layer on a substrate, and a unit for forming a discrete trace recording structure on the substrate; and (d) disk running gear.

Robotic system for optically inspecting workpieces

A manufacturing cell for inspecting workpieces such as magnetic disk substrates comprises an input conveyor for providing workpieces to be tested, one or more testers for inspecting the workpieces, and three or more output receptacles for receiving tested workpieces. One or more robotic arms move the workpieces from the input conveyor to the tester and from the tester to one of the output receptacles depending upon the results of the test performed by the tester. The output receptacles include a pass receptacle, a reject receptacle, and at least an additional receptacle for workpieces that are to be re-worked or studied further. If the additional receptacle is full, workpieces that would otherwise be provided to the additional bin are placed in the reject receptacle. The reject receptacle is very large, so that it is rarely filled to capacity, and it is rarely necessary to shut down the manufacturing cell to replace the reject receptacle.

Modulation of sidewalls of servo sectors of a magnetic disk and the resultant disk

A discrete-track-recording (DTR) disk (also called “patterned” disk) has a sectored servo formed by modulation of its sidewalls in a predetermined manner, whereas sidewalls of data sectors are not modulated in this manner. Each servo sector has two side walls that are each respectively modulated in two different ways. Hence, a readback signal from a given servo sector contains components of each of the two different modulations, even in case of “DC” erase initiation. Therefore, the just-described modulated servo sectors eliminate servowriting. Moreover, data signals are read without filtering the modulation, because data sector sidewalls are not modulated.

METHOD FOR SPATIAL FILTERING OUT OF THE NOISE IN A MAGNETO-OPTICAL READOUT SYSTEM AND DEVICE FOR CARRYING OUT THE METHOD

Use of a quasi-amorphous or amorphous zirconia dielectric layer for optical or magneto-optic data storage media

Press system for nano-imprinting of recording media with a two step pressing method

Recording media press systems and methods of operating such press systems. Embodiments of a press system include a first and second die at least one of which is configured to be coupled to an embossing foil. A stopper may be used to space the embossing foil apart from a magnetic recording disk disposed within the press system by a predetermined gap when the die set is in a closed position. In an embodiment, a piston disposed within at least one of the first and second die is moved relative to the first and second die to press the embossing foil against the magnetic recording disk after the die set stopped in the closed position by the stopper.

Robotic system for optically inspecting workpieces

40 TITLE: ROBOTIC SYSTEM FOR OPTICALLV INSPECTING WORKPIECES ABSTRACT A MANUFACTURING CELL FOR INSPECTING WORKPIECES SUCH AS MAGNETIC DISK SUBSTRATES COMPRISES AN INPUT CONVEYOR FOR PROVIDING WORKPIECES TO BE TESTED, ONE OR MORE TESTERS FOR INSPECTING 5 THE WORKPIECES, AND THREE OR MORE OUTPUT RECEPTACLES FOR RECEIVING TESTED WORKPICCES. ONE OR MORE ROBOTIC ARMS MOVE THE WORKPIECES FROM THE INPUT CONVEYOR TO THE TESTER AND FROM THE TESTER TO ONE OF THE OUTPUT RECEPTACLES DEPENDING UPON THE RESULTS OF THE TEST PERFORMED BY THE TESTER. THE OUTPUT RECEPTACLES INCLUDE A PASS RECEPTACLE, A REJECT RECEPTACLE, AND AT LEAST AN ADDITIONAL RECEPTACLE FOR WORKPIECES THAT ARE TO BE RE-WORKED OR STUDIED FURTHER. 11' TO THE ADDITIONAL RECEPTACLE IS FULL, WORKPIECES THAT WOULD OTHERWISE BE PROVIDED TO THE ADDITIONAL BIN ARE PLACED IN THE RE ECT RECEPTACLE. THE REJECT RECEPTACLE IS VERY LARGE, SO THAT IT IS RARELY FILLED TO CAPACITY, AND IT IS RARELY NECESSARY TO SHUT DOWN THE MANUFACTURING CELL TO REPLACE THE REJECT RECEPTACLE. [FIG. 17AI D CA)

Electrochemical etching of magnetic recording layer

A method of fabricating a perpendicular magnetic recording disk is described. The method may include providing a magnetic recording layer disposed above a substrate with a plurality of intermediate layers disposed there between and electrochemically etching the magnetic recording layer.

Test head for optically inspecting workpieces

An optical test head comprises a block of material with a plurality of optical paths extending therethrough. At least one of the optical paths is an input optical path for receiving laser light and holding a lens for focusing the laser light on a workpiece that is proximate the head. At least another of the optical paths is an output path for receiving light that is reflected off of the workpiece and providing that light to a detector. (In one embodiment, several detectors are provided to direct specularly reflected light, narrow angle scattered light, wide angle scattered light and back scattered light to associated detectors.) Other optical elements can be affixed within or to the block of material. The test head can be used without requiring the individual optical elements to be aligned or adjusted.

Method for spatially filtering out the noise in a magneto-optical read-out system and device for carrying out the method

Test head for optically inspecting workpieces comprising a lens for elongating a laser spot on the workpieces

An optical test head comprises a laser source for providing a laser beam. The laser beam passes through a cylindrical lens for modifying the shape of the beam and a spherical lens for concentrating the beam onto a workpiece (typically a magnetic disk platter). The cylindrical lens both a) elongates the laser beam along the radial direction of the platter (by reducing the effective numerical aperture in the radial direction); and b) causes the beam to be out of focus in the radial direction (although the beam is typically in focus in the circumferential direction). The size of the beam in the radial direction is substantially insensitive to the position of the cylindrical lens.

Señalizador optico y acustico perfeccionado, aplicable en puertas.

SEÑALIZADOR OPTICO Y ACUSTICO PERFECCIONADO, APLICABLE EN PUERTAS, DE LOS CONSTITUIDOS A PARTIR DE UNA ARMADURA O SOPORTE (4), FIJADA SOBRE UNA PUERTA (1), QUE CUENTA CON UNA MANETA O POMO DE ACTUACION (5), Y QUE PRESENTA EL MARCO ALINEADO CON EL CHASIS (4) UN PUENTE DE RETENCION (3) EN EL INTERIOR DEL CUAL SE INTRODUCE EL PESTILLO DESLIZANTE (10) BLOQUEANDO EL ACCESO DE LA PUERTA (1), CARACTERIZADO PORQUE EN EL EXTREMO INTERNO DEL PASADOR (10) EXISTE UNA PROLONGACION (6) QUE PRESENTA UN CONTACTOR (10'') CONECTADO POR UN CABLE A UNA PILA DE ALIMENTACION (8), DIMANANDOSE DE LA PILA DE ALIMENTACION (8) UN SEGUNDO CABLE CONECTADO CON UN TESTIGO LUMINOSO (9) SITUADO EN EL AREA EXTERNA DE LA PUERTA (1), TOMANDO CONTACTO EL CONTACTOR (10'') CON UN PUNTO DE CONEXION (11), DESDE EL CUAL SE DIMANA UN CABLE IGUALMENTE AL TESTIGO OPTICO (9), CUANDO SE MOVILIZA EL PESTILLO (10) EN SENTIDO DE CIERRE, DESBLOQUEANDOSEPOR DESLIZAMIENTO Y FALTA DE CONEXION LOS PUNTOS CONTACTORES (10'' Y 11).

Señalizador optico y acustico perfeccionado, aplicable en puertas.

Method and apparatus for reducing or eliminating stray light in an optical test head

40 TITLE: METHOD AND APPARATUS FOR REDUCING OR ELIMINATING ST1;(AY LIGHT IN AN OPTICAL TEST HEAD ABSTRACT AN OPTICAL TEST HEAD COMPRISES ONE OR MORE OPTICAL INPUT PATHS BY WHICH A BEAM 5 OF LIGHT IS COMMUNICATED FROM A LIGHT SOURCE TO A WORKPIECE AND ONE OR MORE OPTICAL OUTPUT PATHS BY WHICH LIGHT REFLECTED OFF OF THE WORKPIECE IS COMMUNICATED TO A DETECTOR. THE INPUT OPTICAL PATH AND THE OUTPUT OPTICAL PATH CAN INCLUDE ONE OR MORE MIRRORS AND ONE OR MORE LENSES. AT LEAST ONE OF THE OPTICAL PATHS INCLUDES A LAYER FOR TRAPPING AND/OR ABSORBING STRAY LIGHT. ONE OR MORE OF THE LENSES INCLUDES AN ANTI-REFLECTIVE COATING FOR 10 REDUCING NOISE CAUSED BY UNWANTED LIGHT REFLECTION OFF OF THE LENSES. THE OPTICAL PATHS INCLUDE ONE OR MORE MASKS REDUCING STRAY LIGHT. THE ONE OR MORE MASKS CAN HAVE AN ADJUSTABLE APERTURE (E.G. AN IRIS). [FIG. 2AJ

Verfahren zum thermomagnetischen Aufzeichnen von Informationen auf ein hitzeempfindliches Aufzeichnungsmedium und ein thermomagnetisches Aufzeichnungsmedium für dieses Verfahren

Test head for optically inspecting workpieces comprising a lens for elongating a laser spot on the workpieces

37 TITLE TEST HEAD FOR OPTICALLY INSPECTING WORKPIECES COMPRISING A LENS FOR ELONGATING A LASER SPOT ON THE WORKPIECES ABSTRACT 5 AN OPTICAL TEST HEAD COMPRISES A LASER SOURCE FOR PROVIDING A LASER BEAM. THE LASER BEAM PASSES THROUGH A CYLINDRICAL LENS FOR MODIFYING THE SHAPE OF THE BEAM AND A SPHERICAL LENS FOR CONCENTRATING THE BEAM ONTO A WORKPIECE (TYPICALLY A MAGNETIC DISK PLATTER). THE CYLINDRICAL LENS BOTH A) ELONGATES THE LASER BEAM ALONG THE RADIAL DIRECTION OF THE PLATTER (BY REDUCING THE EFFECTIVE NUMERICAL APERTURE IN THE RADIAL DIRECTION); AND B) CAUSES THE BEAM TO 10 BE OUT OF FOCUS IN THE RADIAL DIRECTION (ALTHOUGH THE BEAM IS TYPICALLY IN FOCUS IN THE CIRCUMFERENTIAL DIRECTION). THE SIZE OF THE BEAM IN THE RADIAL DIRECTION IS SUBSTANTIALLY INSENSITIVE TO THE POSITION OF THE CYLINDRICAL LENS. [FIG. 2131

Alginate doser for odontological use

Thermomagnetisches Aufzeichnungsverfahren

Verfahren zum thermomagnetischen aufzeichnen von informationen auf ein hitzeempfindliches aufzeichnungsmedium und ein thermomagnetisches aufzeichnungsmedium fuer dieses verfahren

Thermomagnetic recording process

A recording process is provided for a thermomagnetic recording system wherein recording is by a combination of heating and magnetization of a medium which consists largely of cobalt in hexagonal form. The medium is plated from a cobalt electrolite containing a small amount of phosphorous at a pH of from 5.5 to 6.6. A small amount of nickel may also be present. The resulting recording medium has strongly temperature dependent coercivity characteristics at temperatures well below the Curie point and the ratio of coercivity at 15* C. to that at 150* C. is at least two.