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    Optical disk readout apparatus
    1.
    发明授权
    Optical disk readout apparatus 失效
    光盘读出装置

    公开(公告)号：US5777970A

    公开(公告)日：1998-07-07

    申请号：US603567

    申请日：1996-02-21

    申请人： Seiji Kajiyama ,  Yoichi Tsuchiya ,  Shuichi Ichiura ,  Tateo Toyama ,  Katsutoshi Hibino

    发明人： Seiji Kajiyama ,  Yoichi Tsuchiya ,  Shuichi Ichiura ,  Tateo Toyama ,  Katsutoshi Hibino

    IPC分类号： G11B7/00 ,  G11B7/125 ,  G11B7/135

    CPC分类号： G11B7/13925 ,  G11B7/127 ,  G11B7/1362 ,  G11B7/1365 ,  G11B7/1376 ,  G11B2007/0006

    摘要： An optical disc readout apparatus is disclosured. The apparatus adjusts an optical system which leads the laser beam output from the laser diode to the objective according to the board thickness of the optical disc, and focuses the laser beam onto the information-bearing surface of the disc by the collaboration of the adjusted optical system with the objective. The adjustment can be achieved by, for example, advancing the correction lens to the optical path of the optical system or retreating the correction lens from such optical path. An another apparatus is disclosured. The another apparatus is provided with a first optical system which leads the laser beam output from the first laser diode to the common optical system and a second optical system which leads the laser beam output from the second laser diode to the common optical system. Either the first optical system or the second optical system includes a correction lens. One of the systems is selected according to a type of the loaded disc. Both the first optical system and the second optical system can focus the laser beam onto the information-bearing surface of the disc.

    摘要翻译： 公开了一种光盘读出装置。 该装置调整光学系统，该光学系统根据光盘的板厚将激光二极管的激光束输出到物镜，并通过调整后的光学器件协调将激光束聚焦到光盘的信息承载表面上 系统与目标。 可以通过例如将校正透镜前进到光学系统的光路或从该光路返回校正透镜来实现调整。 公开了另一种装置。 另一装置设置有将从第一激光二极管输出的激光束引导到公共光学系统的第一光学系统和将从第二激光二极管输出的激光束引导到公共光学系统的第二光学系统。 第一光学系统或第二光学系统都包括校正透镜。 根据加载的盘的类型选择其中一个系统。 第一光学系统和第二光学系统都可以将激光束聚焦到盘的信息承载表面上。

    Optical disc recording/reproducing apparatus recording/reproducing information to/from optical discs according to different standards
    2.
    发明授权
    Optical disc recording/reproducing apparatus recording/reproducing information to/from optical discs according to different standards 有权
    光盘记录/再现装置根据不同的标准向/从光盘记录/再现信息

    公开(公告)号：US6122242A

    公开(公告)日：2000-09-19

    申请号：US474907

    申请日：1999-12-29

    申请人： Yoichi Tsuchiya ,  Seiji Kajiyama ,  Yasuyuki Kanou ,  Shuichi Ichiura

    发明人： Yoichi Tsuchiya ,  Seiji Kajiyama ,  Yasuyuki Kanou ,  Shuichi Ichiura

    IPC分类号： G11B7/00 ,  G11B7/013 ,  G11B7/135 ,  G11B19/12

    CPC分类号： G11B7/24085 ,  G11B19/12 ,  G11B7/1369 ,  G11B7/139 ,  G11B2007/0006

    摘要： An optical disc reproducing apparatus includes a semiconductor laser, an objective lens converging a laser beam from the semiconductor laser on a recording surface of an optical disc, a polarization plane rotating unit selectively rotating the plane of polarization of the laser beam according to the thickness of a substrate of the optical disc, and a polarizing filter selectively shading a peripheral portion of the laser beam having the rotated plane of polarization. In one embodiment, a numerical aperture changing unit includes a non-patterned twisted nematic liquid crystal, and the polarizing filter includes a polarizing film having a polarization characteristics at its peripheral portion.

    摘要翻译： 一种光盘再现装置，包括：半导体激光器，将来自半导体激光器的激光束会聚在光盘的记录面上的物镜;偏振面旋转单元，根据激光束的厚度选择性地旋转激光束的偏振面 光盘的基板和选择性地遮蔽具有旋转偏振平面的激光束的周边部分的偏振滤光器。 在一个实施例中，数值孔径改变单元包括非图案扭转向列型液晶，并且偏振滤光器包括在其周边部分具有偏振特性的偏振膜。

    Optical Disc cd recording/reproducing apparatus recording/reproducing information to/from optical discs according to different standards
    3.
    发明授权
    Optical Disc cd recording/reproducing apparatus recording/reproducing information to/from optical discs according to different standards 有权
    光盘记录/再现装置根据不同的标准向/从光盘记录/再现信息

    公开(公告)号：US6167019A

    公开(公告)日：2000-12-26

    申请号：US474554

    申请日：1999-12-29

    申请人： Yoichi Tsuchiya ,  Seiji Kajiyama ,  Yasuyuki Kanou ,  Shuichi Ichiura

    发明人： Yoichi Tsuchiya ,  Seiji Kajiyama ,  Yasuyuki Kanou ,  Shuichi Ichiura

    IPC分类号： G11B7/00 ,  G11B7/013 ,  G11B7/135 ,  G11B19/12

    CPC分类号： G11B7/24085 ,  G11B7/1369 ,  G11B7/139 ,  G11B19/12 ,  G11B2007/0006

    摘要： An optical disc reproducing apparatus includes a semiconductor laser, an objective lens converging a laser beam from the semiconductor laser on a recording surface of an optical disc, a polarization plane rotating unit selectively rotating the plane of polarization of the laser beam according to the thickness of a substrate of the optical disc, and a polarizing filter selectively shading a peripheral portion of the laser beam having the rotated plane of polarization. In one embodiment, a numerical aperture changing unit includes a non-patterned twisted nematic liquid crystal, and the polarizing filter includes a polarizing film having a polarization characteristics at its peripheral portion.

    摘要翻译： 一种光盘再现装置，包括半导体激光器，将来自半导体激光器的激光束会聚在光盘的记录面上的物镜，偏振面旋转单元，根据激光束的厚度选择性地旋转激光束的偏振面 光盘的基板和选择性地遮蔽具有旋转偏振平面的激光束的周边部分的偏振滤光器。 在一个实施例中，数值孔径改变单元包括非图案扭转向列型液晶，并且偏振滤光器包括在其周边部分具有偏振特性的偏振膜。

    Optical head for two different disk thicknesses with a light beam diameter control device
    5.
    发明授权
    Optical head for two different disk thicknesses with a light beam diameter control device 有权
    具有光束直径控制装置的两个不同光盘厚度的光头

    公开(公告)号：US06552990B1

    公开(公告)日：2003-04-22

    申请号：US09180301

    申请日：1998-11-05

    申请人： Seiji Kajiyama ,  Yoichi Tsuchiya ,  Masato Yamada ,  Yasuyuki Kanou ,  Shuichi Ichiura

    发明人： Seiji Kajiyama ,  Yoichi Tsuchiya ,  Masato Yamada ,  Yasuyuki Kanou ,  Shuichi Ichiura

    IPC分类号： G11B700

    CPC分类号： G11B7/1353 ,  G11B7/08582 ,  G11B7/123 ,  G11B7/127 ,  G11B7/1362 ,  G11B7/1367 ,  G11B7/139 ,  G11B2007/0006 ,  G11B2007/13727

    摘要： An optical pickup device which includes a semiconductor laser selectively generating a laser beam with a wavelength of 635 nm, a laser beam with a wavelength of 780 nm, and an optical device having a central region in which a hologram is formed and a peripheral region in which a diffraction grating is formed. In particular, the optical device is arranged immediately below an objective lens, and the central region allows transmission of the laser beam with the wavelength of 635 nm without any diffraction but increases the diameter of the teaser beam to the wavelength of 780 nm by diffraction. On the other hand, peripheral region allows transmission of the laser beam with the wavelength of 635 nm without any diffraction, but substantially shields the laser beam with the wavelength of 780 nm by diffraction. Thus, each laser beam with the wavelength 635 nm is transmitted through objective lens and focused on a signal recording surface of a DVD. The periphery of the laser beam with the wavelength of 780 nm is significantly diffracted by peripheral region of optical device and only the central portion of the laser beam enters objective lens while increasing its diameter. Thus, the laser beam with the wavelength of 780 nm is focused on a signal recording surface of a CD-R or a CD-ROM. Therefore, the optical pickup device is capable of compatibly reproducing the DVD, CD-R and CD-ROM.

    摘要翻译： 一种光拾取装置，包括选择性地产生波长为635nm的激光束的半导体激光器，波长为780nm的激光束，以及具有形成全息图的中心区域的光学元件和周边区域 形成衍射光栅。 特别地，光学装置被布置在物镜的正下方，并且中心区域允许透射具有635nm波长的激光束而没有任何衍射，但是通过衍射将前导光束的直径增加到780nm的波长。 另一方面，外围区域允许透射波长为635nm的激光束而没有衍射，但是通过衍射基本上屏蔽了波长为780nm的激光束。 因此，波长为635nm的每个激光束通过物镜透射并聚焦在DVD的信号记录表面上。 波长为780nm的激光束的周围被光学器件的周边区域显着地衍射，并且只有激光束的中心部分在增加其直径的同时进入物镜。 因此，将波长为780nm的激光束聚焦在CD-R或CD-ROM的信号记录面上。 因此，光学拾取装置能够兼容地再现DVD，CD-R和CD-ROM。

    Apparatus for discriminating optical recording media of different thicknesses from each other and reproducing information therefrom
    7.
    发明授权
    Apparatus for discriminating optical recording media of different thicknesses from each other and reproducing information therefrom 有权
    用于鉴别彼此不同厚度的光学记录介质并再现信息的装置

    公开(公告)号：US06201777B1

    公开(公告)日：2001-03-13

    申请号：US09251448

    申请日：1999-02-17

    申请人： Yoichi Tsuchiya ,  Seiji Kajiyama ,  Yasuyuki Kanou ,  Shuichi Ichiura ,  Koichi Tada ,  Masami Shimizu ,  Toshio Harada

    发明人： Yoichi Tsuchiya ,  Seiji Kajiyama ,  Yasuyuki Kanou ,  Shuichi Ichiura ,  Koichi Tada ,  Masami Shimizu ,  Toshio Harada

    IPC分类号： G11B2010

    CPC分类号： G11B19/12 ,  G11B7/0945 ,  G11B7/12 ,  G11B2007/0006

    摘要： An apparatus for discriminating optical disks has an optical pickup provided with an objective lens having an effective numerical aperture of 0.55 to 0.65, which can compatibly reproduce information from a CD and an SD. The apparatus discriminates presence/absence of waveforms of two focus error signals detected when the effective numerical aperture of the objective lens is set at 0.55 to 0.65 and 0.20 to 0.45 respectively in a process of performing focus servo control, thereby discriminating various types of optical disks from each other. Thus, optical disks having different substrate thicknesses, different track pitches, different minimum pit lengths and different reflectivity can be quickly and simply discriminated from each other.

    摘要翻译： 用于识别光盘的装置具有设置有具有0.55至0.65的有效数值孔径的物镜的光学拾取器，其可以兼容地再现来自CD和SD的信息。 当在执行聚焦伺服控制的过程中，当物镜的有效数值孔径分别设定为0.55至0.65和0.20至0.45时，所述装置鉴别出检测到的两个聚焦误差信号的波形的存在/不存在，从而区分各种类型的光盘 从彼此。 因此，可以快速且简单地区分具有不同衬底厚度，不同轨道间距，不同最小凹坑长度和不同反射率的光盘。