公开(公告)号：US20060028927A1

公开(公告)日：2006-02-09

申请号：US11238272

申请日：2005-09-29

申请人： Hidenori Wada ,  Tetsuo Saimi ,  Daisuke Ogata ,  Seiji Nishino ,  Hiroaki Yamamoto ,  Shin-ichi Kadowaki ,  Yoshiaki Komma

发明人： Hidenori Wada ,  Tetsuo Saimi ,  Daisuke Ogata ,  Seiji Nishino ,  Hiroaki Yamamoto ,  Shin-ichi Kadowaki ,  Yoshiaki Komma

IPC分类号： G11B7/00

CPC分类号： G11B7/13925 ,  G02F2203/18 ,  G11B7/0948 ,  G11B7/1369 ,  G11B7/13927 ,  G11B2007/0013

摘要： The invention presents an optical element with which an optical head can be configured, in which there is little deterioration of the correctional effect when the objective lens shifts, as well as an optical head and an optical recording/reproducing apparatus using such an optical element. The invention also presents a novel optical recording/reproducing apparatus and optical recording/reproducing method. The optical element, includes a first voltage application electrode 13, a first opposing electrode 17 arranged in opposition to the first voltage application electrode 13, and a first phase changing layer 15 arranged between the first voltage application electrode 13 and the first opposing electrode 17. By changing a voltage between the first voltage application electrode 13 and the first opposing electrode 17, a phase that converts plane waves into spherical waves is imparted on light that is incident on the first phase changing layer 15.

摘要翻译： 本发明提供了一种光学元件，通过该光学元件可以配置光学头，其中当物镜移动时，校正效果几乎没有劣化，以及使用这种光学元件的光学头和光学记录/再现装置。 本发明还提出了一种新颖的光学记录/再现装置和光学记录/再现方法。 光学元件包括第一电压施加电极13，与第一电压施加电极13相对布置的第一相对电极17和布置在第一施加电极13和第一相对电极17之间的第一相变层15。 通过改变第一电压施加电极13和第一相对电极17之间的电压，将入射到第一相变层15上的光转换成球面波的相位。

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：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：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。

公开(公告)号：US20080112303A1

公开(公告)日：2008-05-15

申请号：US12002380

申请日：2007-12-17

申请人： Hidenori Wada ,  Tetsuo Saimi ,  Daisuke Ogata ,  Seiji Nishino ,  Hiroaki Yamamoto ,  Shin-ichi Kadowaki ,  Yoshiaki Komma

发明人： Hidenori Wada ,  Tetsuo Saimi ,  Daisuke Ogata ,  Seiji Nishino ,  Hiroaki Yamamoto ,  Shin-ichi Kadowaki ,  Yoshiaki Komma

IPC分类号： G11B7/00

CPC分类号： G11B7/13925 ,  G02F2203/18 ,  G11B7/0948 ,  G11B7/1369 ,  G11B7/13927 ,  G11B2007/0013

摘要： The invention presents an optical element with which an optical head can be configured, in which there is little deterioration of the correctional effect when the objective lens shifts, as well as an optical head and an optical recording/reproducing apparatus using such an optical element. The invention also presents a novel optical recording/reproducing apparatus and optical recording/reproducing method. The optical element, includes a first voltage application electrode 13, a first opposing electrode 17 arranged in opposition to the first voltage application electrode 13, and a first phase changing layer 15 arranged between the first voltage application electrode 13 and the first opposing electrode 17. By changing a voltage between the first voltage application electrode 13 and the first opposing electrode 17, a phase that converts plane waves into spherical waves is imparted on light that is incident on the first phase changing layer 15.

摘要翻译： 本发明提供了一种光学元件，通过该光学元件可以配置光学头，其中当物镜移动时，校正效果几乎没有劣化，以及使用这种光学元件的光学头和光学记录/再现装置。 本发明还提出了一种新颖的光学记录/再现装置和光学记录/再现方法。 光学元件包括第一电压施加电极13，与第一电压施加电极13相对布置的第一相对电极17和布置在第一施加电极13和第一相对电极17之间的第一相变层15。 通过改变第一电压施加电极13和第一相对电极17之间的电压，将入射到第一相变层15上的光转换成球面波的相位。

公开(公告)号：US07158450B2

公开(公告)日：2007-01-02

申请号：US10892066

申请日：2004-07-14

申请人： Hidenori Wada ,  Tetsuo Saimi ,  Daisuke Ogata ,  Seiji Nishino ,  Hiroaki Yamamoto ,  Shin-ichi Kadowaki ,  Yoshiaki Komma

发明人： Hidenori Wada ,  Tetsuo Saimi ,  Daisuke Ogata ,  Seiji Nishino ,  Hiroaki Yamamoto ,  Shin-ichi Kadowaki ,  Yoshiaki Komma

IPC分类号： G11B7/00 ,  G11B7/135 ,  G11B7/20

CPC分类号： G11B7/13925 ,  G02F2203/18 ,  G11B7/0948 ,  G11B7/1369 ,  G11B7/13927 ,  G11B2007/0013

摘要： The invention presents an optical element with which an optical head can be configured, in which there is little deterioration of the correctional effect when the objective lens shifts, as well as an optical head and an optical recording/reproducing apparatus using such an optical element. The invention also presents a novel optical recording/reproducing apparatus and optical recording/reproducing method. The optical element, includes a first voltage application electrode 13, a first opposing electrode 17 arranged in opposition to the first voltage application electrode 13, and a first phase changing layer 15 arranged between the first voltage application electrode 13 and the first opposing electrode 17. By changing a voltage between the first voltage application electrode 13 and the first opposing electrode 17, a phase that converts plane waves into spherical waves is imparted on light that is incident on the first phase changing layer 15.

公开(公告)号：US07113472B2

公开(公告)日：2006-09-26

申请号：US10096674

申请日：2002-03-12

申请人： Hidenori Wada ,  Seiji Nishino ,  Shin-ichi Kadowaki ,  Hiroaki Yamamoto ,  Daisuke Ogata

发明人： Hidenori Wada ,  Seiji Nishino ,  Shin-ichi Kadowaki ,  Hiroaki Yamamoto ,  Daisuke Ogata

IPC分类号： G11B7/00

CPC分类号： G11B7/128 ,  G02F1/061 ,  G02F2203/07 ,  G11B7/1369

摘要： An optical head for recording or reproducing a signal with respect to an optical recording medium, which includes an optical element disposed between a light source and an optical recording medium. The optical element has an optically active polymer film in which an optical rotation property changes with respect to an applied voltage, a pair of conductive transparent thin films for applying a voltage to the optically active polymer film, and a transmittance polarization anisotropic part having a different transmittance with respect to a polarization direction, which is disposed on one of the conductive transparent thin films. By changing the applied voltage to the optically active polymer film, a light quantity of a linearly polarized light transmitted through the optical element can be changed substantially instantaneously. Therefore, the power of light reaching the optical recording medium can be switched substantially instantaneously at the time when switched between recording and reproduction.

摘要翻译： 一种用于记录或再现关于光学记录介质的信号的光学头，其包括设置在光源和光学记录介质之间的光学元件。 光学元件具有光学旋转特性相对于施加电压发生变化的光学活性聚合物膜，用于向光学活性聚合物膜施加电压的一对导电透明薄膜和具有不同的透射率偏振各向异性部分 相对于偏振方向的透射率，其设置在导电透明薄膜之一上。 通过将施加的电压改变为光学活性聚合物膜，可以基本上瞬时地改变透过光学元件的线偏振光的光量。 因此，到达光记录介质的光的功率可以在记录和再现之间切换时基本瞬时切换。

公开(公告)号：US06987598B2

公开(公告)日：2006-01-17

申请号：US10892009

申请日：2004-07-14

申请人： Hidenori Wada ,  Tetsuo Saimi ,  Daisuke Ogata ,  Seiji Nishino ,  Hiroaki Yamamoto ,  Shin-ichi Kadowaki ,  Yoshiaki Komma

发明人： Hidenori Wada ,  Tetsuo Saimi ,  Daisuke Ogata ,  Seiji Nishino ,  Hiroaki Yamamoto ,  Shin-ichi Kadowaki ,  Yoshiaki Komma

IPC分类号： G02F1/03 ,  G02F1/01 ,  G02F1/00 ,  G11B7/00

CPC分类号： G11B7/13925 ,  G02F2203/18 ,  G11B7/0948 ,  G11B7/1369 ,  G11B7/13927 ,  G11B2007/0013

摘要： The invention presents an optical element with which an optical head can be configured, in which there is little deterioration of the correctional effect when the objective lens shifts, as well as an optical head and an optical recording/reproducing apparatus using such an optical element. The invention also presents a novel optical recording/reproducing apparatus and optical recording/reproducing method. The optical element, includes a first voltage application electrode 13, a first opposing electrode 17 arranged in opposition to the first voltage application electrode 13, and a first phase changing layer 15 arranged between the first voltage application electrode 13 and the first opposing electrode 17. By changing a voltage between the first voltage application electrode 13 and the first opposing electrode 17, a phase that converts plane waves into spherical waves is imparted on light that is incident on the first phase changing layer 15.

摘要翻译： 本发明提供了一种光学元件，通过该光学元件可以配置光学头，其中当物镜移动时，校正效果几乎没有劣化，以及使用这种光学元件的光学头和光学记录/再现装置。 本发明还提出了一种新颖的光学记录/再现装置和光学记录/再现方法。 光学元件包括第一电压施加电极13，与第一电压施加电极13相对布置的第一相对电极17和布置在第一施加电极13和第一相对电极17之间的第一相变层15。 通过改变第一电压施加电极13和第一相对电极17之间的电压，将入射到第一相变层15上的光转换成球面波的相位。