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    Pick-up device for use in an optical information recording system
    5.
    发明授权
    Pick-up device for use in an optical information recording system 失效
    用于光学信息记录系统的拾取装置

    公开(公告)号：US4849825A

    公开(公告)日：1989-07-18

    申请号：US928395

    申请日：1986-11-10

    申请人： Yukio Kurata ,  Hideaki Sato ,  Yasuo Nakata ,  Nobuo Ogata ,  Teruaki Inoue

    发明人： Yukio Kurata ,  Hideaki Sato ,  Yasuo Nakata ,  Nobuo Ogata ,  Teruaki Inoue

    IPC分类号： G11B7/12 ,  G11B7/135

    CPC分类号： G11B7/1353 ,  G11B7/123

    摘要： A pick-up device which includes a light source and a condenser lens for effecting recording and reproduction of information by projecting a light beam as collected by the condenser lens onto a recording medium. A diffraction grating is provided between the light source and the condenser lens for dividing light returning from the recording medium by a diffraction grating so as to be directed to a photo-detector, to thereby obtain an optical detection signal.

    摘要翻译： 一种拾取装置，其包括光源和聚光透镜，用于通过将由聚光透镜收集的光束投射到记录介质上来进行信息的记录和再现。 在光源和聚光透镜之间设置衍射光栅，用于通过衍射光栅分离从记录介质返回的光，以便被引导到光检测器，从而获得光检测信号。

    Polarization detector
    6.
    发明授权
    Polarization detector 失效
    极化探测器

    公开(公告)号：US5473470A

    公开(公告)日：1995-12-05

    申请号：US093920

    申请日：1993-07-21

    申请人： Takahiro Miyake ,  Yoshio Yoshida ,  Yasuo Nakata ,  Yukio Kurata

    发明人： Takahiro Miyake ,  Yoshio Yoshida ,  Yasuo Nakata ,  Yukio Kurata

    IPC分类号： G01J4/04 ,  G02B5/18 ,  G02B5/30 ,  G02B27/28 ,  G11B11/10 ,  G11B11/105 ,  G11B7/00

    CPC分类号： G01J4/04 ,  G02B27/283 ,  G02B5/1809 ,  G02B5/1814

    摘要： A polarization detector includes a polarization diffraction element having a substrate with two facing surfaces which are placed in parallel with each other, a first diffraction grating formed on one surface of the substrate, and a second diffraction grating formed on the other surface of the substrate, with light being incident upon the first diffraction grating. Further, each grating pitch of the first diffraction grating and the second diffraction grating are nearly equal to a wavelength of the incident light. A limiting member is also included for limiting an incident region of the incident light with respect to the polarization diffraction element. The limiting member is formed on a light incident side of the first diffraction grating. Further, a converging lens is included for respectively converging light transmitted through the first diffraction grating and the second diffraction grating and light diffracted by the first diffraction grating and the second diffraction grating into different beam spots. Finally, a pair of photodetectors are included for detecting each optical intensity of the two beam spots converged by the converging lens.

    摘要翻译： 偏振检测器包括具有彼此平行放置的具有两个相对表面的基板的偏振衍射元件，形成在基板的一个表面上的第一衍射光栅和形成在基板的另一表面上的第二衍射光栅， 光入射到第一衍射光栅上。 此外，第一衍射光栅和第二衍射光栅的每个光栅间距几乎等于入射光的波长。 还包括限制入射光相对于偏振衍射元件的入射区域的限制构件。 限制部件形成在第一衍射光栅的光入射侧。 此外，包括会聚透镜，用于分别会聚透过第一衍射光栅和第二衍射光栅的光以及由第一衍射光栅和第二衍射光栅衍射的光成为不同的光束点。 最后，包括一对光检测器，用于检测由会聚透镜会聚的两束光束的每个光强度。

    Optical pickup device with diffraction device
    7.
    再颁专利
    Optical pickup device with diffraction device 失效
    具有衍射装置的光学拾取装置

    公开(公告)号：USRE35332E

    公开(公告)日：1996-09-24

    申请号：US123459

    申请日：1993-09-17

    申请人： Toshiya Nagahama ,  Yoshio Yoshida ,  Yasuo Nakata ,  Yukio Kurata

    发明人： Toshiya Nagahama ,  Yoshio Yoshida ,  Yasuo Nakata ,  Yukio Kurata

    IPC分类号： G11B7/09 ,  G11B7/135 ,  G01J1/20 ,  G11B7/00

    CPC分类号： G11B7/1381 ,  G11B7/0916 ,  G11B7/1353

    摘要： An optical pickup device in which a main beam and a pair of sub-beams are used and a diffraction device is disposed between a recording medium and a light receiving device such as a photodetector is disclosed. The diffraction device comprises first to third diffraction regions. The second and third regions receive light beams from the recording medium which are substantially identical in amount to each other. The light receiving device comprises a first to a fourth light receiving regions. The first and second light receiving regions are juxtaposed, and separated by a line. The main beam which has been diffracted by the first diffraction region is focused onto said line. The main beam which has been diffracted by the second diffraction region is focused onto the first light receiving region. The main beam which has been diffracted by the third diffracting region is focused onto the second light receiving region. The sub-beams which have been diffracted by the diffraction device are focused onto the third and fourth light receiving regions, respectively. Alternatively, the diffraction device comprises an area where one or more diffraction regions are formed. The farthest point of the area at the side of the light receiving device is separated from the optical axis by a predetermined distance, to prevent the first order diffracted beam from entering the optical system disposed between the diffraction device and a recording medium.

    摘要翻译： 公开了一种其中使用主光束和一对子光束并且在记录介质和诸如光电检测器的光接收装置之间设置衍射装置的光学拾取装置。 衍射装置包括第一至第三衍射区域。 第二和第三区域接收来自记录介质的光束彼此基本相同。 光接收装置包括第一至第四光接收区域。 第一和第二光接收区域并列并且被一行分开。 已经被第一衍射区衍射的主光束被聚焦到所述线上。 已经被第二衍射区域衍射的主光束被聚焦到第一光接收区域上。 已经被第三衍射区域衍射的主光束被聚焦到第二光接收区域上。 已经被衍射装置衍射的子光束分别聚焦在第三和第四光接收区上。 或者，衍射装置包括形成一个或多个衍射区域的区域。 光接收装置一侧的区域的最远点与光轴分开预定距离，以防止一级衍射光束进入设置在衍射装置和记录介质之间的光学系统。

    Optical pickup device with diffraction device
    9.
    发明授权
    Optical pickup device with diffraction device 失效
    具有衍射装置的光学拾取装置

    公开(公告)号：US5049732A

    公开(公告)日：1991-09-17

    申请号：US424373

    申请日：1989-10-19

    申请人： Toshiya Nagahama ,  Yoshio Yoshida ,  Yasuo Nakata ,  Yukio Kurata

    发明人： Toshiya Nagahama ,  Yoshio Yoshida ,  Yasuo Nakata ,  Yukio Kurata

    IPC分类号： G11B7/09 ,  G11B7/135

    CPC分类号： G11B7/1381 ,  G11B7/0916 ,  G11B7/1353

    摘要： An optical pickup device in which a main beam and a pair of sub-beams are used and a diffraction device is disposed between a recording medium and a light receiving device such as a photodetector is disclosed. The diffraction device comprises first to third diffraction regions. The second and third regions receive light beams from the recording medium which are substantially identical in amount to each other. The light receiving device comprises a first to a fourth light receiving regions. The first and second light receiving regions are juxtaposed, and separated by a line. The main beam which has been diffracted by the first diffraction region is focused onto said line. The main beam which has been diffracted by the second diffraction region is focused onto the first light receiving region. The main beam which has been diffracted by the third diffracting region is focused onto the second light receiving region. The sub-beams which have been diffracted by the diffraction device are focused onto the third and fourth light receiving regions, respectively. Alternatively, the diffraction device comprises an area where one or more diffraction regions are formed. The farthest point of the area at the side of the light receiving device is separated from the optical axis by a predetermined distance, to prevent the first order diffracted beam from entering the optical system disposed between the diffraction device and a recording medium.