公开(公告)号：US20090034401A1

公开(公告)日：2009-02-05

申请号：US12183250

申请日：2008-07-31

Applicant: Seiji Nishiwaki ,  Kazuo Momoo ,  Jun-ichi Asada ,  Kenji Otani ,  Yusuke Kanda

Inventor： Seiji Nishiwaki ,  Kazuo Momoo ,  Jun-ichi Asada ,  Kenji Otani ,  Yusuke Kanda

IPC: G11B7/135 ,  B05D5/06 ,  C08F2/48

CPC classification number: G11B7/1365 ,  G11B7/1353 ,  G11B7/1381

Abstract: It is intended to provide an optical disk apparatus which detects a light amount greater than zero even when used in conjunction with an optical disk substrate having a large birefringence, so that it is possible to properly read a signal without errors and properly perform optical disk controls. The optical disk apparatus includes: a light source for emitting light; an objective lens for converging the light onto a signal surface of an optical disk; a polarized beam diffraction element for diffracting the light reflected from the optical disk; a photodetector for detecting the light diffracted from the polarized beam diffraction element; and a wavelength plate disposed between the optical disk and the polarized beam diffraction element. The wavelength plate has a two-dimensional array of a plurality of birefringent regions including first and second regions, the first and second regions differing in birefringent phase difference and/or optic axes from each other, and the plurality of birefringent regions including the first and second regions cause the light to have different polarization states.

Abstract translation: 即使在与具有大双折射性的光盘基板结合使用的情况下，也能够提供大于零的光量的光盘装置，从而可以正确地读取无误信号，适当地执行光盘控制 。 光盘装置包括：用于发光的光源; 用于将光聚焦到光盘的信号表面上的物镜; 用于衍射从光盘反射的光的偏振光束衍射元件; 用于检测从偏振光束衍射元件衍射的光的光检测器; 以及布置在光盘和偏振光束衍射元件之间的波长板。 波长板具有包括第一和第二区域的多个双折射区域的二维阵列，第一和第二区域在双折射相位差和/或光轴上彼此不同，并且多个双折射区域包括第一和第二区域 第二区域导致光具有不同的偏振状态。

公开(公告)号：US07463569B2

公开(公告)日：2008-12-09

申请号：US11112998

申请日：2005-04-22

Applicant: Seiji Nishiwaki ,  Kazuo Momoo ,  Jun-ichi Asada ,  Kenji Otani ,  Yusuke Kanda

Inventor： Seiji Nishiwaki ,  Kazuo Momoo ,  Jun-ichi Asada ,  Kenji Otani ,  Yusuke Kanda

IPC: G11B7/00

CPC classification number: G11B7/1365 ,  G11B7/1353 ,  G11B7/1381

Abstract: It is intended to provide an optical disk apparatus which detects a light amount greater than zero even when used in conjunction with an optical disk substrate having a large birefringence, so that it is possible to properly read a signal without errors and properly perform optical disk controls. The optical disk apparatus includes: a light source for emitting light; an objective lens for converging the light onto a signal surface of an optical disk; a polarized beam diffraction element for diffracting the light reflected from the optical disk; a photodetector for detecting the light diffracted from the polarized beam diffraction element; and a wavelength plate disposed between the optical disk and the polarized beam diffraction element. The wavelength plate has a two-dimensional array of a plurality of birefringent regions including first and second regions, the first and second regions differing in birefringent phase difference and/or optic axes from each other, and the plurality of birefringent regions including the first and second regions cause the light to have different polarization states.

Abstract translation: 即使在与具有大双折射性的光盘基板结合使用的情况下，也能够提供大于零的光量的光盘装置，从而可以正确地读取无误信号，适当地执行光盘控制 。 光盘装置包括：用于发光的光源; 用于将光聚焦到光盘的信号表面上的物镜; 用于衍射从光盘反射的光的偏振光束衍射元件; 用于检测从偏振光束衍射元件衍射的光的光检测器; 以及布置在光盘和偏振光束衍射元件之间的波长板。 波长板具有包括第一和第二区域的多个双折射区域的二维阵列，第一和第二区域在双折射相位差和/或光轴上彼此不同，并且多个双折射区域包括第一和第二区域 第二区域导致光具有不同的偏振状态。

公开(公告)号：US20050237902A1

公开(公告)日：2005-10-27

申请号：US11112998

申请日：2005-04-22

Applicant: Seiji Nishiwaki ,  Kazuo Momoo ,  Jun-ichi Asada ,  Kenji Otani ,  Yusuke kanda

Inventor： Seiji Nishiwaki ,  Kazuo Momoo ,  Jun-ichi Asada ,  Kenji Otani ,  Yusuke kanda

IPC: G11B7/0065 ,  G11B7/135

CPC classification number: G11B7/1365 ,  G11B7/1353 ,  G11B7/1381

Abstract: It is intended to provide an optical disk apparatus which detects a light amount greater than zero even when used in conjunction with an optical disk substrate having a large birefringence, so that it is possible to properly read a signal without errors and properly perform optical disk controls. The optical disk apparatus includes: a light source for emitting light; an objective lens for converging the light onto a signal surface of an optical disk; a polarized beam diffraction element for diffracting the light reflected from the optical disk; a photodetector for detecting the light diffracted from the polarized beam diffraction element; and a wavelength plate disposed between the optical disk and the polarized beam diffraction element. The wavelength plate has a two-dimensional array of a plurality of birefringent regions including first and second regions, the first and second regions differing in birefringent phase difference and/or optic axes from each other, and the plurality of birefringent regions including the first and second regions cause the light to have different polarization states.

Abstract translation: 即使在与具有大双折射性的光盘基板结合使用的情况下，也能够提供大于零的光量的光盘装置，从而可以正确地读取无误信号，适当地执行光盘控制 。 光盘装置包括：用于发光的光源; 用于将光聚焦到光盘的信号表面上的物镜; 用于衍射从光盘反射的光的偏振光束衍射元件; 用于检测从偏振光束衍射元件衍射的光的光检测器; 以及布置在光盘和偏振光束衍射元件之间的波长板。 波长板具有包括第一和第二区域的多个双折射区域的二维阵列，第一和第二区域在双折射相位差和/或光轴上彼此不同，并且多个双折射区域包括第一和第二区域 第二区域导致光具有不同的偏振状态。