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Semiconductor light emitting device and wafer

Номер патента: US20120001151A1. Автор: Hiroshi Katsuno, Kei Kaneko, Mitsuhiro Kushibe, Yasuo Ohba. Владелец: Toshiba Corp. Дата публикации: 05-01-2012.
A semiconductor light emitting device includes a first layer made of at least one of n-type GaN and n-type AlGaN; a second layer made of Mg-containing p-type AlGaN; and a light emitting section provided between the first layer and the second layer. The light emitting section included a plurality of barrier layers made of Si-containing Al x Ga 1-x-y In y N (0≦x, 0≦y, x+y≦1), and a well layer provided between each pair of the plurality of barrier layers and made of GaInN or AlGaInN. The plurality of barrier layers have a nearest barrier layer and a far barrier layer. The nearest barrier layer is nearest to the second layer among the plurality of barrier layers. The nearest barrier layer includes a first portion and a second portion. The first portion is made of Si-containing Al x Ga 1-x-y In y N (0≦x, 0≦y, x+y≦1). The second portion is provided between the first portion and the second layer and is made of Al x Ga 1-x-y In y N (0≦x, 0≦y, x+y≦1). The Si concentration in the second portion is lower than a Si concentration in the first portion and lower than a Si concentration in the far barrier layer.

Image reading apparatus, image forming apparatus, and size detecting method

Номер патента: US20120002246A1. Автор: Hiroyuki Shiraishi, Katsuya Nagamochi, Koji Shimokawa, Mitsuru Hatano, Naoya Koseki, Sueo Ueno, Yusuke Hashizume. Владелец: Toshiba Corp, Toshiba TEC Corp. Дата публикации: 05-01-2012.
According to an embodiment, an image reading apparatus includes: a light emitting body configured to emit light at illuminance lower than illuminance in reading an original document; a sensor configured to detect opening and closing of a cover; an image pickup element configured to pick up an image of the original document, on which the light from the light emitting body is irradiated, if the cover is open; and a control and determining section configured to turn on the light emitting body if the cover is opened and specify a pixel having a value exceeding a threshold from the picked-up image to determine the size of the original document.

Image reading apparatus, image forming apparatus and method

Номер патента: US20120002254A1. Автор: Shogo Ogawa, Tadashi Mokudai, Yoshio Yoshimura. Владелец: Toshiba Corp, Toshiba TEC Corp. Дата публикации: 05-01-2012.
Certain embodiments provide an image reading apparatus including: a monochrome CCD sensor including a first photo-diode array; plural color CCD sensors each including a second photodiode array; an AD converter configured to apply analog-to-digital conversion to each of analog outputs from the second photodiode array and the first photodiode array; a delay processing unit configured to delay at least one of color image data of plural colors from the AD converter and interpolate, with delayed any one or more of the color image data, a blank of image data that is to be read on a line in a sub-scanning direction; and an inter-line correction unit configured to correct, by the intervals and a set reduction magnification, a positional deviation in the sub-scanning direction between the monochrome image data and the color image data, respective timings of which are aligned on the line by the delay processing unit.

Magnetic recording apparatus and method of testing magnetic recording apparatus

Номер патента: US20120002316A1. Автор: Kazuto Kashiwagi, Masatoshi Sakurai, Naoki Tagami. Владелец: Toshiba Corp. Дата публикации: 05-01-2012.
According to one embodiment, there is provided a magnetic recording apparatus including a head slider including read and write elements, and a magnetic recording medium including magnetically recordable recording tracks with a width L 1, a wide land track with a width L 2 larger than the width L 1 of the recording track, and non-recording sections with a width G 1 each provided between adjacent recording tracks. The width L 1 of the recording track is smaller than a bottom read width BRW of the read and write elements, and the width L 2 of the wide land track is larger than the bottom read width BRW of the read and write elements.

Characterizing frequency response of a multirate system

Номер патента: US20120002525A1. Автор: Eric R. DUNN. Владелец: Toshiba Corp. Дата публикации: 05-01-2012.
Frequency response is characterized for mechanical components of a multirate system operating in a closed-loop environment. A disturbance is injected at the frequency of interest and at each of the alias frequencies thereof as an input into the multirate system, and a matrix equation composed of resulting measurements of the response of the multirate system is solved to compute the frequency response at the frequency of interest and at each of the alias frequencies. The resulting frequency response can be used to synthesize the transfer function of the entire system, which allows simulation and evaluation of the relative performance of multiple controller designs without the need for further frequency response measurements.

Image Forming Apparatus and Method

Номер патента: US20120002985A1. Автор: Junichi Katayama. Владелец: Toshiba Corp, Toshiba TEC Corp. Дата публикации: 05-01-2012.
Certain embodiments provide an image forming apparatus including: a drum; a photoconductive member; a charging device; a developing device; a toner supplying section; a transfer member; a sensor to measure the density of a toner band adhering on the transfer member; a process control section to separately control on and off of a developing bias and on and off of a charging bias; a timing adjusting section to instruct the process control section to turn on the developing bias at timing when a portion not substantially charged on the photoconductive member is opposed to the developing device; and a calculating section to calculate an amount of supply of toner from the toner supplying section into the developing device according to a result of measurement of the density of the toner band which is formed by the developing bias enabled by the timing adjusting section by the sensor.

Ultrasound diagnosis apparatus, image processing apparatus and image processing method

Номер патента: US20120004552A1. Автор: Naohisa Kamiyama. Владелец: Toshiba Corp, Toshiba Medical Systems Corp. Дата публикации: 05-01-2012.
According to one embodiment, an ultrasound diagnosis apparatus includes a change amount calculating unit, an estimating unit and a control unit. The change amount calculating unit is configured to calculate amount of change of a pattern of each of a plurality of local regions among a plurality of ultrasound images generated along time series based on a reflected wave of an ultrasound wave transmitted by an ultrasound probe. The estimating unit is configured to estimate a position of a rotation axis of a scanning cross-section in each ultrasound image based on the amount of change of the pattern of each of the plurality of local regions calculated by the change amount calculating unit. The control unit is configured to superimpose the rotation axis estimated by the estimating unit on each ultrasound image and displays the same on a monitor.

Image forming apparatus and cleaning method

Номер патента: US20120008970A1. Автор: Sunao Takenaka. Владелец: Toshiba Corp, Toshiba TEC Corp. Дата публикации: 12-01-2012.
An image forming apparatus comprising: a first image bearing member; a second image bearing member on which a toner having at least a particle diameter or a circularity different from that of the toner supplied to the first image bearing member is supplied, coming into contact with, further upstream than a contact position between the first image bearing member and a recording medium or a transfer member; a first transfer member; a second transfer member; a printing-information acquiring section which acquires single color printing information; a printing determining section which determines, whether the executed printing in the single color exceeds a reference; a toner-image forming section which forms the toner image on the second image bearing member if the printing in the single color exceeds the reference; and a transfer-bias applying section which applies the bias to the first transfer member and the second transfer member, transfer the toner image formed on the second image bearing member, and move the toner from the toner image on the recording medium or the transfer member onto the first image bearing member.

Semiconductor wafer, semiconductor device and method of fabricating the same

Номер патента: US20120009744A1. Автор: Satoshi Inaba. Владелец: Toshiba Corp. Дата публикации: 12-01-2012.
A semiconductor substrate according to an embodiment includes: a first semiconductor wafer having a first crystal; and a second semiconductor wafer formed of a second crystal substantially same as the first crystal on the first semiconductor wafer, a crystal-axis direction of unit cell thereof being twisted at a predetermined angle around a direction vertical to a principal surface of the second semiconductor wafer from that of the first semiconductor wafer.

Digital signature generation apparatus, digital signature verification apparatus, and key generation apparatus

Номер патента: US20120011369A1. Автор: Koichiro Akiyama, Yasuhiro Goto. Владелец: Toshiba Corp. Дата публикации: 12-01-2012.
A digital signature generation apparatus includes memory to store finite field F q and section D(u x (s, t), u y (s, t), s, t) as secret key, section being one of surfaces of three-dimensional manifold A(x, y, s, t) which is expressed by x-coordinate, y-coordinate, parameter s, and parameter t and is defined on finite field Fq, x-coordinate and y-coordinate of section being expressed by functions of parameter s and parameter t, calculates hash value of message m, generates hash value polynomial by embedding hash value in 1-variable polynomial h(t) defined on finite field F q , and generates digital signature D s (U x (t), U y (t), t) which is curve on section, the x-coordinate and y-coordinate of curve being expressed by functions of parameter t, by substituting hash value polynomial in parameter s of section.