公开(公告)号：US20110116332A1

公开(公告)日：2011-05-19

申请号：US12618827

申请日：2009-11-16

申请人： TOMOMI NAKA ,  Hajime Sakata

发明人： TOMOMI NAKA ,  Hajime Sakata

IPC分类号： G11C29/00

CPC分类号： G11C29/50 ,  G11C29/12005 ,  G11C2029/5006

摘要： A semiconductor memory device includes a plurality of memory cell transistors arranged in a matrix and each configured to store data, and a test circuit configured to output to outside the semiconductor memory device an output signal indicative of an amount of test current flowing through a selected one of the plurality of memory cell transistors, wherein the test circuit includes a plurality of reference cell transistors employed to successively produce varying amounts of currents, a comparison circuit configured to successively compare the amount of test current with each of the varying amounts of currents, and a code generating circuit configured to generate a code indicative of a result of the successive comparisons performed by the comparison circuit, wherein the code is output as the output signal.

摘要翻译： 半导体存储器件包括以矩阵形式布置并分别被配置为存储数据的多个存储单元晶体管，以及测试电路，被配置为向半导体存储器件外部输出指示流过所选择的测试电流量的输出信号 所述多个存储单元晶体管中的所述测试电路包括用于连续产生不同数量电流的多个参考单元晶体管;比较电路，被配置为连续地将所述测试电流的量与所述不同量的电流中的每一个进行比较;以及 代码生成电路，被配置为生成表示由所述比较电路执行的连续比较的结果的代码，其中所述代码被输出作为所述输出信号。

公开(公告)号：US08213247B2

公开(公告)日：2012-07-03

申请号：US12618827

申请日：2009-11-16

申请人： Tomomi Naka ,  Hajime Sakata

发明人： Tomomi Naka ,  Hajime Sakata

IPC分类号： G11C29/00

CPC分类号： G11C29/50 ,  G11C29/12005 ,  G11C2029/5006

摘要： A semiconductor memory device includes a plurality of memory cell transistors arranged in a matrix and each configured to store data, and a test circuit configured to output to outside the semiconductor memory device an output signal indicative of an amount of test current flowing through a selected one of the plurality of memory cell transistors, wherein the test circuit includes a plurality of reference cell transistors employed to successively produce varying amounts of currents, a comparison circuit configured to successively compare the amount of test current with each of the varying amounts of currents, and a code generating circuit configured to generate a code indicative of a result of the successive comparisons performed by the comparison circuit, wherein the code is output as the output signal.

摘要翻译： 半导体存储器件包括以矩阵形式布置并分别被配置为存储数据的多个存储单元晶体管，以及测试电路，被配置为向半导体存储器件外部输出指示流过所选择的测试电流量的输出信号 所述多个存储单元晶体管中的所述测试电路包括用于连续产生不同数量电流的多个参考单元晶体管;比较电路，被配置为连续地将所述测试电流的量与所述不同量的电流中的每一个进行比较;以及 代码生成电路，被配置为生成表示由所述比较电路执行的连续比较的结果的代码，其中所述代码被输出作为所述输出信号。

公开(公告)号：US20080002745A1

公开(公告)日：2008-01-03

申请号：US11896142

申请日：2007-08-30

申请人： Kazunari Fujii ,  Hajime Sakata ,  Yukio Furukawa

发明人： Kazunari Fujii ,  Hajime Sakata ,  Yukio Furukawa

IPC分类号： H01S5/06

CPC分类号： H04N9/3129 ,  H01S5/005 ,  H01S5/0092 ,  H01S5/06256 ,  H01S5/06804

摘要： A distributed Bragg reflection (DBR) semiconductor laser is controlled in an image projecting apparatus. The image projecting apparatus includes the DBR semiconductor laser which is provided with a phase region and a DBR region, a light wavelength converting device for converting fundamental-wave light emitted from the DBR semiconductor laser into second harmonic wave light, an optical deflector for scanning the second harmonic wave in a one-dimensional or two-dimensional manner, and a modulating portion for modulating the DBR semiconductor laser based on an image signal. In the control method, a coefficient calculating step and a wavelength adjusting step are performed within a non-drawing time during which a drawing signal, which corresponds to the image signal, is absent. In the coefficient calculating step, at least one coefficient in a relationship between a DBR current to be injected into the DBR region and a phase current to be injected into the phase region for continuously shifting the wavelength of the fundamental-wave light is calculated. In the wavelength adjusting step, the DBR current injected into the DBR region and the phase current injected into the phase region are changed based on the relationship such that the second harmonic wave light is adjusted.

摘要翻译： 在图像投影装置中控制分布式布拉格反射（DBR）半导体激光器。 图像投影装置包括具有相位区域和DBR区域的DBR半导体激光器，用于将从DBR半导体激光器发射的基波光转换为二次谐波光的光波长转换装置，用于扫描 一维或二维二次谐波，以及用于基于图像信号调制DBR半导体激光器的调制部分。 在控制方法中，系数计算步骤和波长调整步骤在不存在对应于图像信号的绘制信号的非绘制时间内执行。 在系数计算步骤中，计算要注入到DBR区域的DBR电流和要注入到用于连续移位基波的波长的相位区域的相电流之间的关系中的至少一个系数。 在波长调整步骤中，根据调整二次谐波光的关系，改变注入DBR区域的DBR电流和注入相位区域的相电流。

公开(公告)号：US5155736A

公开(公告)日：1992-10-13

申请号：US790832

申请日：1991-11-14

申请人： Takeo Ono ,  Hajime Sakata

发明人： Takeo Ono ,  Hajime Sakata

IPC分类号： H01S5/0625 ,  H01S5/34 ,  H01S5/50

CPC分类号： B82Y20/00 ,  H01S5/06255 ,  H01S5/34 ,  H01S5/06256 ,  H01S5/06258 ,  H01S5/5045

摘要： A semiconductor laser element capable of changing an oscillation wavelength over a wide range without increasing a threshold current is disclosed. A wavelength selective filter capable of changing a selected wavelength over a wide range is also disclosed. The semiconductor laser element has a substrate and a laser resonator formed on the substrate by stacking semiconductor layers including an active layer and an optical waveguide layer of a superlattice structure. The resonator includes a first reflection portion, an active portion, a phase adjustment portion and second reflection portion which are juxtaposed in a resonance direction. Diffraction gratings are formed in the optical guide layer of the first and second reflection portions. Electrodes are independently formed in the active portion, the phase adjustment portion and the first and second reflection portions. Further, a method for driving the semiconductor laser is disclosed.

摘要翻译： 公开了能够在不增加阈值电流的情况下在宽范围内改变振荡波长的半导体激光元件。 还公开了能够在宽范围内改变选定波长的波长选择滤波器。 半导体激光元件具有通过层叠包括有源层和超晶格结构的光波导层的半导体层而形成在基板上的基板和激光谐振器。 谐振器包括在谐振方向上并列的第一反射部分，有源部分，相位调整部分和第二反射部分。 衍射光栅形成在第一和第二反射部分的光导层中。 电极独立地形成在有源部分，相位调整部分和第一和第二反射部分中。 此外，公开了一种用于驱动半导体激光器的方法。

公开(公告)号：US5109444A

公开(公告)日：1992-04-28

申请号：US718927

申请日：1991-06-25

申请人： Uuichi Handa ,  Hidetoshi Nojiri ,  Hajime Sakata

发明人： Uuichi Handa ,  Hidetoshi Nojiri ,  Hajime Sakata

IPC分类号： G02B6/122 ,  G02B6/12 ,  G02F1/025 ,  H01S5/00 ,  H01S5/026 ,  H01S5/10 ,  H01S5/50 ,  H04B10/213

CPC分类号： H01S5/50 ,  G02B6/12004 ,  H01S5/0264 ,  H01S5/10

摘要： This specification discloses an integrated type optical node comprising a substrate, a channel light waveguide formed on the substrate for connecting the transmission lines of an optical information system, an amplifying portion provided on the light waveguide for amplifying a light propagated through the waveguide, and a light branching-off portion provided on the light waveguide for coupling a light transmitter and/or a light receiver to the transmission lines. The specification also discloses an optical information system using such optical node.

公开(公告)号：US5002369A

公开(公告)日：1991-03-26

申请号：US292537

申请日：1988-12-30

申请人： Hajime Sakata

发明人： Hajime Sakata

IPC分类号： G02F3/02

CPC分类号： G02F3/024

摘要： A nonlinear optical element comprises a nonlinear medium having photoconductivity and an electrooptical effect, a pair of electrodes, arranged on two side surfaces of said nonlinear medium, for applying an electric field to the medium, for serving as reflection mirrors forming an optical resonator, and a pair of insulating layers formed between the nonlinear medium and the electrodes. A predetermined DC voltage is supplied to the electrodes, and the nonlinear medium is irradiated with a light having a variable intensity. Thus, the reflectance and transmittance of the optical element is non-linearly varied in accordance with the intensity of the incident light. Also disclosed is a method for activating such a nonlinear optical element.

公开(公告)号：US4856869A

公开(公告)日：1989-08-15

申请号：US35017

申请日：1987-04-06

申请人： Hajime Sakata ,  Yasuyuki Watanabe ,  Masato Yamanobe ,  Yukitoshi Ohkubo ,  Akihiro Nagano

发明人： Hajime Sakata ,  Yasuyuki Watanabe ,  Masato Yamanobe ,  Yukitoshi Ohkubo ,  Akihiro Nagano

IPC分类号： G02B5/18 ,  G02F1/29 ,  G09F9/35

CPC分类号： G09F9/35 ,  G02B5/1842 ,  G02F1/292

摘要： A display element includes a substrate and a display pattern formed on the substrate, the display pattern including a diffraction grating. The width in the direction perpendicular to the grating lines of the diffraction grating of the display pattern is selected so as to prevent re-diffraction of the light diffracted by the one diffraction grating. An observation apparatus includes the afore-said display element, but the display pattern has a first diffraction grating structure and a second diffraction grating structure. An illuminating system and an observation system are added so as to allow for observation of the display pattern. The direction of the grating lines of the first diffraction grating structure differs from that of the grating lines of the second diffraction grating structure, thereby preventing the occurrence of a rainbow-like image.

摘要翻译： 显示元件包括基板和形成在基板上的显示图案，显示图案包括衍射光栅。 选择与显示图案的衍射光栅的光栅线垂直的方向的宽度，以防止由一个衍射光栅衍射的光的再衍射。 观察装置包括上述显示元件，但显示图案具有第一衍射光栅结构和第二衍射光栅结构。 添加照明系统和观察系统，以便观察显示图案。 第一衍射光栅结构的光栅线的方向与第二衍射光栅结构的光栅线的方向不同，从而防止出现彩虹状的图像。

公开(公告)号：US07039077B2

公开(公告)日：2006-05-02

申请号：US10620419

申请日：2003-07-17

申请人： Yukio Furukawa ,  Hajime Sakata

发明人： Yukio Furukawa ,  Hajime Sakata

IPC分类号： H01S3/10

CPC分类号： G02F1/3534 ,  G02F1/3558

摘要： An optical wavelength converting apparatus includes a first semiconductor laser, a second semiconductor laser, and a wavelength converting element for converting first and second laser light from the first and second semiconductor lasers to sum frequency light. In this apparatus, the first semiconductor laser and the wavelength converting element are arranged so as to establish an external resonator structure in which the first laser light can be put under a resonant condition, and an optical path of the second laser light is so determined that the second laser light can propagate through the wavelength converting element.

摘要翻译： 光波长转换装置包括第一半导体激光器，第二半导体激光器和用于将来自第一和第二半导体激光器的第一和第二激光转换为和频光的波长转换元件。 在该装置中，第一半导体激光器和波长转换元件被布置成建立其中可以将第一激光置于共振条件下的外部谐振器结构，并且确定第二激光的光路，使得 第二激光可以通过波长转换元件传播。

公开(公告)号：US06987785B2

公开(公告)日：2006-01-17

申请号：US10404057

申请日：2003-04-02

申请人： Hajime Sakata ,  Yukio Furukawa

发明人： Hajime Sakata ,  Yukio Furukawa

IPC分类号： H01S3/10

CPC分类号： B82Y20/00 ,  G02F1/353 ,  G02F1/3556 ,  H01S5/06213 ,  H01S5/0622 ,  H01S5/125 ,  H01S5/32366 ,  H01S5/34306

摘要： There is provided a harmonic generator generates high power laser light and can be modulated at high modulation rate. The semiconductor laser emits a first output light when a bias current is supplied, and a second output light when a modulating current is superposed to the bias current. On of the first output lights has a wavelength inside of a wavelength tolerance of phase-matching of the wavelength-converting element. The other has a wavelength outside of the wavelength tolerance of phase-matching.

公开(公告)号：US20050254531A1

公开(公告)日：2005-11-17

申请号：US11120950

申请日：2005-05-04

申请人： Yukio Furukawa ,  Hajime Sakata ,  Kazunari Fujii

发明人： Yukio Furukawa ,  Hajime Sakata ,  Kazunari Fujii

IPC分类号： G02B26/10 ,  G02F1/377 ,  H01S3/10 ,  H01S5/00 ,  H01S5/02 ,  H01S5/06 ,  H01S5/0625 ,  H01S5/0687 ,  H01S5/125

CPC分类号： H01S5/06256 ,  H01S5/005 ,  H01S5/0092 ,  H01S5/02248 ,  H01S5/0617 ,  H01S5/06804

摘要： A light wavelength converting apparatus includes a semiconductor laser having a gain region, a phase region, and a distributed Bragg reflection (DBR) region, a nonlinear optical device for receiving fundamental-wave light emitted from the semiconductor laser and outputting second harmonic wave light, a first optical detector for monitoring an output of the fundamental-wave light, a second optical detector for monitoring the second harmonic wave light, and a control portion for controlling at least a drive current for driving the semiconductor laser. The control portion includes a control parameter determiner, and a wavelength controller. The control parameter determiner changes a DBR current supplied to the DBR region and a phase current supplied to the phase region to obtain a changing point that corresponds to a discontinuous change in an electrical signal from the first optical detector, and determines a control parameter for controlling the DBR current and the phase current such that the relationship between the DBR current and the phase current is not located on the changing point. The wavelength controller controls the DBR current and the phase current pursuant to the control parameter such that an oscillation wavelength of the semiconductor laser can be continuously controlled.

摘要翻译： 光波长转换装置包括具有增益区域，相位区域和分布布拉格反射区域的半导体激光器，用于接收从半导体激光器发射的基波光并输出二次谐波光的非线性光学装置， 用于监视基波输出的第一光检测器，用于监测第二谐波光的第二光检测器，以及用于至少控制用于驱动半导体激光器的驱动电流的控制部分。 控制部分包括控制参数确定器和波长控制器。 控制参数确定器改变提供给DBR区域的DBR电流和提供给相位区域的相电流，以获得对应于来自第一光学检测器的电信号的不连续变化的变化点，并且确定用于控制的控制参数 DBR电流和相电流使得DBR电流和相电流之间的关系不位于变化点上。 波长控制器根据控制参数控制DBR电流和相电流，使得能够连续地控制半导体激光器的振荡波长。