公开(公告)号：US06450056B2

公开(公告)日：2002-09-17

申请号：US09769428

申请日：2001-01-26

申请人： Katsuhiko Torii ,  Hiroaki Yamamoto

发明人： Katsuhiko Torii ,  Hiroaki Yamamoto

IPC分类号： F16H116

CPC分类号： F16D41/105 ,  F16D3/02 ,  F16D3/12 ,  F16D41/10 ,  F16H2057/0213 ,  H02K7/081 ,  Y10T74/19842 ,  Y10T74/19847

摘要： In a motor having a motor body and a speed reduction devise composed of gear housing, a worm wheel, worm shaft with a worm, and first and second bearings rotatably supporting the worm shaft on opposite sides of the worm, the first bearing on a side of the motor body inclines a given angle to a bending side of the worm shaft, when the worm shaft is bent by an overload transmitted thereto via the worm wheel. Accordingly, a locally concentrated frictional wear of the bearing is reduced.

摘要翻译： 在具有电动机体和减速装置的电动机中，包括齿轮箱，蜗轮蜗杆蜗杆，以及可旋转地支撑蜗杆的蜗杆轴的第一和第二轴承，一侧的第一轴承 当蜗杆轴经由蜗轮传递到其上的过载而被弯曲时，电动机体向蜗杆的弯曲侧倾斜给定的角度。 因此，轴承的局部集中摩擦磨损降低。

公开(公告)号：US06400671B2

公开(公告)日：2002-06-04

申请号：US09897811

申请日：2001-07-02

申请人： Hideki Hayashi ,  Tatsuo Ito ,  Yoshiaki Komma ,  Hiroaki Yamamoto ,  Seiji Nishino

发明人： Hideki Hayashi ,  Tatsuo Ito ,  Yoshiaki Komma ,  Hiroaki Yamamoto ,  Seiji Nishino

IPC分类号： G11B700

CPC分类号： G11B7/131 ,  G11B7/0912 ,  G11B7/0943 ,  G11B7/133 ,  G11B7/1353 ,  G11B2007/0006

摘要： In a photodetector, the minimum size of the photodetection area for detecting a focus error signal from a light beam on the inner radius side of a hologram is made smaller than the minimum diameter of diffracted light beam spots (30, 31) for recording and reproduction, and when a CD is reproduced, a light beam close to the optical axis is made to significantly contribute to the focus error signal and the minimum size of the photodetection area for detecting the focus error signal from a light beam from the peripheral side of the hologram is made larger than the minimum diameter of diffracted light beam spots (130, 131) for recording and reproduction, whereby the focus error signal is made equal to the normal focus error signal when a DVD is reproduced, so that the focus offset variation caused when the base material thickness varies can be reduced.

摘要翻译： 在光电检测器中，将用于检测来自全息图的内半径侧上的光束的聚焦误差信号的光检测区域的最小尺寸设定为小于用于记录和再现的衍射光束点（30,31）的最小直径 ，并且当再现CD时，使靠近光轴的光束显着有助于聚焦误差信号和用于从来自所述光轴的外围侧的光束检测聚焦误差信号的光检测区域的最小尺寸 使全息图大于用于记录和再现的衍射光束点（130,131）的最小直径，由此当再现DVD时使聚焦误差信号等于正常聚焦误差信号，使得聚焦偏移变化引起 当基材厚度变化时可以减少。

公开(公告)号：US06292441B1

公开(公告)日：2001-09-18

申请号：US09061822

申请日：1998-04-16

申请人： Hiroaki Yamamoto ,  Daisuke Ogata ,  Ken'ichi Kasazumi ,  Seiji Nishino ,  Hidenori Wada ,  Sadao Mizuno

发明人： Hiroaki Yamamoto ,  Daisuke Ogata ,  Ken'ichi Kasazumi ,  Seiji Nishino ,  Hidenori Wada ,  Sadao Mizuno

IPC分类号： G11B700

CPC分类号： G11B7/131 ,  G11B7/0908 ,  G11B7/094 ,  G11B7/1353 ,  G11B7/1381

摘要： An optical head device includes a light source for emitting a light beam having a predetermined wavelength, an optical system for converging the light beam emitted from the light source on an information medium, and a light detector for receiving the light beam reflected from the information medium and detecting a focus error signal based on the received light beam. The light detector includes a plurality of pairs of photodetectors. The light detector generates the focus error signal based on a differential signal generated by each pair of the plurality of pairs of photodetectors. The plurality of pairs of photodetectors are arranged so that a fluctuation in the differential signal generated by at least one of the pairs of the plurality of pairs of photodetectors is cancelled by a fluctuation in the differential signal generated by at least another of the pairs of the plurality of pairs of photodetectors.

摘要翻译： 光头装置包括用于发射具有预定波长的光束的光源，用于将从光源发射的光束会聚在信息介质上的光学系统，以及用于接收从信息介质反射的光束的光检测器 以及基于所接收的光束检测聚焦误差信号。 光检测器包括多对光电检测器。 光检测器基于由每对多个光电检测器生成的差分信号产生聚焦误差信号。 多对光检测器被布置成使得由多对光检测器中的至少一对成对的光检测器产生的差分信号的波动被由至少另一对成对的光检测器产生的差分信号的波动所抵消 多对光电探测器。

公开(公告)号：US06271942B1

公开(公告)日：2001-08-07

申请号：US08978820

申请日：1997-11-26

申请人： Hiroyuki Sasai ,  Hiroaki Yamamoto ,  Kuniaki Utsumi ,  Katsuyuki Fujito ,  Yutaka Fuke

发明人： Hiroyuki Sasai ,  Hiroaki Yamamoto ,  Kuniaki Utsumi ,  Katsuyuki Fujito ,  Yutaka Fuke

IPC分类号： H04J1402

CPC分类号： H04B10/564 ,  H04B10/504 ,  H04B10/572 ,  H04B10/58

摘要： An oscillator outputs an additional signal with a frequency which is higher than a frequency corresponding to a bandwidth of a frequency band allotted to an electrical signal to be transmitted and lower than a half of a lowest frequency of a frequency band allotted to the electrical signal to be transmitted. Thereby, if a second order intermodulation distortion between the additional signal and the electrical signal to be transmitted occurs, a frequency where distortion occurs is outside all of the frequency bands allotted to the electrical signal to be transmitted, and the occurring second order intermodulation distortion does not affect the electrical signal to be transmitted. Further, if the second order intermodulation distortion of the additional signal occurs, the frequency where distortion occurs is outside all of the frequency bands allotted to the electrical signal to be transmitted, and the occurring second order intermodulation distortion does not affect the electrical signal to be transmitted. Not only noise and distortions caused by reflected optical signal but also OBI noise can be reduced by using the additional signal.

摘要翻译： 振荡器输出一个附加信号，该信号的频率高于分配给要发送的电信号的频带的带宽的频率，并且低于分配给电信号的频带的最低频率的一半， 被传送。 因此，如果发生附加信号和要发送的电信号之间的二阶互调失真，则发生失真的频率在分配给要发送的电信号的所有频带之外，并且发生的二阶互调失真 不影响要传输的电信号。 此外，如果发生附加信号的二阶互调失真，则发生失真的频率在分配给要发送的电信号的所有频带之外，并且发生的二阶互调失真不影响电信号 传输。 不仅可以通过使用附加信号来减少由反射光信号引起的噪声和失真，而且可以减少OBI噪声。

公开(公告)号：US6115345A

公开(公告)日：2000-09-05

申请号：US888529

申请日：1997-07-07

申请人： Makoto Kato ,  Kenichi Kasazumi ,  Shin-ichi Kadowaki ,  Hiroaki Yamamoto ,  Kazuhisa Yamamoto

发明人： Makoto Kato ,  Kenichi Kasazumi ,  Shin-ichi Kadowaki ,  Hiroaki Yamamoto ,  Kazuhisa Yamamoto

IPC分类号： G06K7/10 ,  G11B7/12 ,  G11B7/13 ,  G11B7/135 ,  G11B11/105 ,  G11B7/00

CPC分类号： B82Y10/00 ,  G06K7/10831 ,  G11B11/10543 ,  G11B7/123 ,  G11B7/131 ,  G11B7/1353 ,  G11B7/1367 ,  G11B7/1369 ,  G11B7/1387 ,  G11B7/1395 ,  G06K2207/1013 ,  G11B2007/13727

摘要： A linearly polarized light beam emitted from a coherent light source reaches a polarizing phase plate and is thereby divided into a primary beam and a subsidiary beam having a polarized light component perpendicular to the polarized light component of the primary beam and a double-humped pattern, in which the center position coincides with the center position of the primary beam and the principal portion is equal in size to the principal portion of the primary beam. The primary beam and the subsidiary beam are focused onto an information storage surface of an optical disk and reflected therefrom, so that they are separated again through polarization separation and individually detected by first to third optical detectors. The output signals from the first to third optical detectors are calculated by a differential calculator and outputted therefrom.

摘要翻译： 从相干光源发射的线偏振光束到达偏振相位板，从而分为初级光束和具有垂直于主光束的偏振光分量的偏振光分量的辅助光束和双峰值图案， 其中中心位置与主光束的中心位置一致，并且主要部分的大小与主光束的主要部分相等。 主光束和辅助光束被聚焦到光盘的信息存储表面上并从其反射，使得它们通过偏振分离再次分离并且由第一至第三光学检测器单独检测。 来自第一至第三光学检测器的输出信号由差分计算器计算并输出。

公开(公告)号：US6111842A

公开(公告)日：2000-08-29

申请号：US15367

申请日：1998-01-29

申请人： Seiji Nishino ,  Hiroaki Yamamoto ,  Ken'ichi Kasazumi ,  Shin-ichi Kadowaki

发明人： Seiji Nishino ,  Hiroaki Yamamoto ,  Ken'ichi Kasazumi ,  Shin-ichi Kadowaki

IPC分类号： G11B7/13 ,  G11B7/09 ,  G11B7/125 ,  G11B7/135

CPC分类号： G11B7/1353 ,  G11B7/139 ,  G11B7/0901 ,  G11B7/0909

摘要： An optical head has a light source for emitting a light beam; optical device for condensing the emitted light beam onto an information recording medium and condensing light reflected from the information recording medium; and aperture limitation device for, of the condensed reflected light, causing light of a predetermined outer region to exit in a position different from a position where light of an inner region exits, wherein the light of the outer region and the light of the inner region caused to exit by the aperture limitation devices are separated to different places.

摘要翻译： 光头具有用于发射光束的光源; 光学装置，用于将发射的光束聚集到信息记录介质上并聚集从信息记录介质反射的光; 以及用于聚光反射光的孔径限制装置，使得预定外部区域的光在与内部区域的光的出射位置不同的位置处离开，其中外部区域的光和内部区域的光 导致由孔径限制装置退出分离到不同的地方。

公开(公告)号：US5875049A

公开(公告)日：1999-02-23

申请号：US803927

申请日：1997-02-24

申请人： Hiroaki Asano ,  Hiroaki Yamamoto ,  Katsuyuki Fujito

发明人： Hiroaki Asano ,  Hiroaki Yamamoto ,  Katsuyuki Fujito

IPC分类号： H03F3/08 ,  H03F3/45 ,  H04B10/69 ,  H04B10/06

CPC分类号： H03F3/08 ,  H03F3/45475 ,  H03F3/45982 ,  H04B10/6933

摘要： The present invention provides an amplifier capable of accurately reproducing a signal under various operating environments and an optical receiving circuit using the amplifier. The differential amplifier is constructed such that the amplification factor thereof is set to 0.5, and a variation occurring inside thereof is the same as a variation occurring inside of the differential amplifier. Respective output variations occurring in maximum value holding circuits due to a temperature variation and a power supply voltage variation are canceled by providing differential amplification in the differential amplifier. At this time, an output variation occurring in the differential amplifier is also canceled. Therefore, an output variation occurring in the differential amplifier is made equal in value to the output variation occurring in the differential amplifier, such that the same variation as a signal input is superimposed on the reference input fed to the differential amplifier. consequently, a reference input accurately following the DC level of the signal input can be fed to the differential amplifier, whereby stable amplification can always be provided.

摘要翻译： 本发明提供一种能够在各种操作环境下准确再现信号的放大器和使用放大器的光接收电路。 差分放大器被构造为使其放大系数设定为0.5，并且其内部的变化与差分放大器内部发生的变化相同。 通过在差分放大器中提供差分放大来消除由于温度变化和电源电压变化而在最大值保持电路中发生的各自的输出变化。 此时，差分放大器中出现的输出变化也被取消。 因此，使差分放大器中发生的输出变化值与差分放大器中出现的输出变化值相等，使得与馈送到差分放大器的参考输入相同的信号输入变化相加。 因此，准确跟随信号输入的DC电平的参考输入可以被馈送到差分放大器，由此可以总是提供稳定的放大。

公开(公告)号：US5757754A

公开(公告)日：1998-05-26

申请号：US495137

申请日：1995-06-28

申请人： Hiroaki Yamamoto ,  Tetsuo Saimi ,  Seiji Nishino ,  Yoshiaki Komma ,  Hidenori Wada

发明人： Hiroaki Yamamoto ,  Tetsuo Saimi ,  Seiji Nishino ,  Yoshiaki Komma ,  Hidenori Wada

IPC分类号： G11B7/09 ,  G11B7/12 ,  G11B7/135 ,  G11B7/00

CPC分类号： G11B7/1353 ,  G11B7/0901 ,  G11B7/094 ,  G11B7/123 ,  G11B7/0912 ,  G11B7/0916

摘要： A light beam emitted from a semiconductor laser element is collimated by a collimating lens, and is applied to an optical disk through a polarizing holographic beam splitter, a .lambda./4 plate and an objective lens, a light beam reflected by the optical disk is applied to the polarizing holographic beam splitter and is diffracted. Diffracted light beams of +1st order and -1st order are applied to two photodetectors, and a focus error signal is obtained on the basis of the diffracted light beam of +1st order and a tracking error signal is obtained on the basis of the diffracted light beam of -1st order.

摘要翻译： 从半导体激光元件发射的光束被准直透镜准直，并通过偏振全息光束分离器，λ/ 4板和物镜施加到光盘上，施加由光盘反射的光束 到偏振全息分束器并被衍射。 + 1级和-1级的衍射光束被施加到两个光电检测器，并且基于+ 1阶的衍射光束获得聚焦误差信号，并且基于衍射光获得跟踪误差信号 光束为-1阶。

公开(公告)号：US5687153A

公开(公告)日：1997-11-11

申请号：US778508

申请日：1997-01-03

申请人： Yoshiaki Komma ,  Seiji Nishino ,  Shin-ichi Kadowaki ,  Hiroaki Yamamoto ,  Makoto Kato ,  Tetsuo Saimi

发明人： Yoshiaki Komma ,  Seiji Nishino ,  Shin-ichi Kadowaki ,  Hiroaki Yamamoto ,  Makoto Kato ,  Tetsuo Saimi

IPC分类号： G11B7/09 ,  G11B7/12 ,  G11B7/135 ,  G11B11/105 ,  G11B7/00

CPC分类号： G11B7/1353 ,  G11B11/10543 ,  G11B7/12 ,  G11B7/123 ,  G11B7/0912

摘要： An optical head device includes: a light source for emitting a light beam; an objective lens for converging the light beam on an information storage medium; a hologram for receiving the light beam reflected by the information storage medium and generating diffracted light from the light beam, the hologram having such a polarization anisotropy that it diffracts light in a second polarization state more strongly than light in a first polarization state which is different from the second polarization state; and a photodetector including a plurality of photodetective sections for receiving a part of the diffracted light and outputting a photocurrent in accordance with the intensity of the part of the diffracted light. The optical head device further include a quarter-wave plate disposed between the objective lens and the hologram for causing the polarization state of the light beam reflected by the information storage medium to be the second polarization state; and the hologram is disposed so that the distance between the hologram and the objective lens is shorter than the distance between the hologram and the photodetector.

摘要翻译： 光头装置包括：用于发射光束的光源; 用于将光束会聚在信息存储介质上的物镜; 用于接收由信息存储介质反射的光束并产生来自光束的衍射光的全息图，该全息图具有这样的偏振各向异性，使得它在比第一偏振态不同的光更强烈地衍射具有第二偏振态的光 从第二极化状态; 以及光电检测器，其包括多个光电检测部分，用于接收一部分衍射光并根据部分衍射光的强度输出光电流。 光头装置还包括设置在物镜和全息图之间的四分之一波片，用于使由信息存储介质反射的光束的偏振状态成为第二偏振状态; 并且全息图被设置成使得全息图和物镜之间的距离比全息图和光电检测器之间的距离短。

公开(公告)号：US5455712A

公开(公告)日：1995-10-03

申请号：US237561

申请日：1994-05-03

申请人： Hiroaki Yamamoto ,  Seiji Nishino ,  Kazuhisa Yamamoto

发明人： Hiroaki Yamamoto ,  Seiji Nishino ,  Kazuhisa Yamamoto

IPC分类号： G02B5/18 ,  G02B5/30 ,  G02B27/28 ,  G11B7/135 ,  G11B11/105 ,  G02B1/08

CPC分类号： G11B7/1353 ,  G02B27/283 ,  G02B5/1833 ,  G02B5/3083 ,  G11B11/10515 ,  G11B11/10545

摘要： An optical element includes a crystal of Li.sub.X Ta.sub.1-X NbO.sub.3 which has one of an x-surface and a y-surface, where X denotes an atomic fraction and 0.ltoreq.X.ltoreq.1. Proton-exchanged layers periodically extend on one of the x-surface and the y-surface of the crystal. Grooves extend in said one of the x-surface and the y-surface of the crystal, and have bottoms which are defined by surfaces of the proton-exchanged layers. Ordinary light which has passed through the proton-exchanged layers and the grooves is out of phase with respect to ordinary light which has passed through a region of the crystal outside the proton-exchanged layers and the grooves by a quantity of (2n+1).pi., where n denotes an arbitrary integer. Extraordinary light which has passed through the proton-exchanged layers and the grooves is out of phase with respect to extraordinary light which has passed through a region of the crystal outside the proton-exchanged layers and the grooves by a quantity of 2m.pi., where m denotes an arbitrary integer.

摘要翻译： 光学元件包括具有x表面和y表面之一的LiXTa1-XNbO3的晶体，其中X表示原子分数，0表示X = 1。 质子交换层周期性延伸在晶体的x面和y表面之一上。 沟槽在晶体的x表面和y表面中的所述一个中延伸，并且具有由质子交换层的表面限定的底部。 通过质子交换层和槽的普通光相对于通过质子交换层外侧的晶体区域和沟槽的一定数量的（2n + 1）的普通光而异相， pi，其中n表示任意整数。 已经通过质子交换层和沟槽的非凡光相对于通过质子交换层外面的晶体的一部分和沟槽的一部分2μm的非均匀的光而异相，其中m 表示任意整数。