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111 条记录 (耗时 0.03 秒)

    Object lens and optical head for reproducing data from optical disks in different thickness of substrate
    1.
    发明授权
    Object lens and optical head for reproducing data from optical disks in different thickness of substrate 失效
    对象透镜和光学头，用于从不同厚度的基板的光盘再现数据

    公开(公告)号：US5889748A

    公开(公告)日：1999-03-30

    申请号：US772874

    申请日：1996-12-26

    申请人： Takeshi Shimano ,  Masayuki Inoue ,  Akira Arimoto ,  Hiroyuki Minemura ,  Hisao Fujita ,  Hideaki Koyanagi

    发明人： Takeshi Shimano ,  Masayuki Inoue ,  Akira Arimoto ,  Hiroyuki Minemura ,  Hisao Fujita ,  Hideaki Koyanagi

    IPC分类号： G02B13/00 ,  G11B7/00 ,  G11B7/125 ,  G11B7/135

    CPC分类号： G11B7/1381 ,  G11B7/1367 ,  G11B7/1374 ,  G11B7/139 ,  G11B2007/0006 ,  G11B2007/13727

    摘要： The objective lens has a numerical aperture NA=0.6 when reproducing a DVD having a thickness of 0.6 mm and NA=0.42 when reproducing a CD having a thickness of 1.2 mm. At a boundary of NA 0.42, a slight stepped portion is formed so as to establish a phase difference. In this case, a designed wavelength is 0.635 .mu.m, and an optimum designed substrate thickness of a central portion is approximately 0.8 mm. While the DVD is reproduced, wave front aberration is on the order of 0.025.lambda., and jitter contained in the reproduction signal of the CD is equivalent to the present jitter. As a consequence, such an objective lens and an optical head with employment of this objective lens are provided, which precisely reproduce signals from the CD having the substrate thickness of 1.2 mm, and the DVD having the substrate thickness of 0.6 mm.

    摘要翻译： 当再现厚度为1.2mm的CD时，物镜在再现厚度为0.6mm的DVD和NA = 0.42时具有数值孔径NA = 0.6。 在NA 0.42的边界处，形成一个微小的台阶部分以形成相位差。 在这种情况下，设计波长为0.635μm，中心部分的最佳设计基板厚度为约0.8mm。 当DVD被再现时，波前像差在0.025λ的数量级，并且包含在CD的再现信号中的抖动等于当前的抖动。 因此，提供这样的物镜和使用这种物镜的光学头，其精确地再现了具有1.2mm的衬底厚度的CD的信号，以及具有0.6mm的衬底厚度的DVD。

    Tracking method for optical disk apparatus using diffraction light
    2.
    发明授权
    Tracking method for optical disk apparatus using diffraction light 失效
    使用衍射光的光盘装置的跟踪方法

    公开(公告)号：US5930220A

    公开(公告)日：1999-07-27

    申请号：US770075

    申请日：1996-12-19

    申请人： Takeshi Shimano ,  Akira Arimoto ,  Takeshi Nakao ,  Masayuki Inoue ,  Kunikazu Ohnishi ,  Yoshio Suzuki

    发明人： Takeshi Shimano ,  Akira Arimoto ,  Takeshi Nakao ,  Masayuki Inoue ,  Kunikazu Ohnishi ,  Yoshio Suzuki

    IPC分类号： G11B7/00 ,  G11B7/09 ,  G11B7/13 ,  G11B7/135

    CPC分类号： G11B7/1353 ,  G11B7/094 ,  G11B7/131 ,  G11B2007/0006 ,  G11B7/0901 ,  G11B7/0909

    摘要： In an optical head, light from a semiconductor laser is directed through a condensing optical system with a condensing lens onto an optical information recording medium through a transparent substrate in the form of a light spot. A unit for producing a light spot position control signal and a unit able to move the light spot, which supports the objective lens for movement, position the light spot on an information track. Light reflected from the optical information recording medium is directed through a polarized light branching element to a photo detector. Also mounted for movement with the objective lens are a polarization conversion element, arranged between the optical information recording medium and the polarized light branching element in order to change the polarization state of light incident to the optical information recording medium and reflected therefrom and a polarization diffraction grating, the diffraction efficiency of which changes depending on the change in the polarization state of the incident light and the reflected light caused by the polarization conversion element. The light spot control signal is detected from both reflected light diffracted through the polarization diffraction grating and non-diffracted reflected light contained in the light which passes through the polarized light branching element.

    摘要翻译： 在光头中，来自半导体激光器的光通过具有聚光透镜的聚光系统通过光点形式的透明基板引导到光信息记录介质上。 用于产生光点位置控制信号的单元和能够移动支持物镜移动的光点的单元将光斑定位在信息轨道上。 从光信息记录介质反射的光通过偏振光分支元件被引导到光检测器。 为了使入射到光信息记录介质的光的偏振状态改变并反射，偏振转换元件也安装在光学信息记录介质和偏振光分支元件之间，并且偏振衍射元件 光栅，其衍射效率根据入射光的偏振态和由偏振转换元件引起的反射光的变化而变化。 从通过偏振衍射光栅衍射的反射光和通过偏振光分支元件的光中包含的非衍射反射光检测光点控制信号。

    Information recording apparatus, recording media and recording method
    4.
    发明授权
    Information recording apparatus, recording media and recording method 失效
    信息记录装置，记录介质和记录方法

    公开(公告)号：US07349319B2

    公开(公告)日：2008-03-25

    申请号：US10763274

    申请日：2004-01-26

    申请人： Motoyasu Terao ,  Kyoko Kojima ,  Hiroyuki Minemura ,  Takeshi Maeda ,  Takeshi Shimano

    发明人： Motoyasu Terao ,  Kyoko Kojima ,  Hiroyuki Minemura ,  Takeshi Maeda ,  Takeshi Shimano

    IPC分类号： G11B7/00

    CPC分类号： G11B7/14 ,  G11B7/0903 ,  G11B7/127 ,  G11B7/24038

    摘要： An information recording apparatus includes a multilayer information recording medium having a first layer containing an electro-chromic material, an electrode layer applying a voltage to the first layer to color the first layer, a second layer containing an electro-chromic material, a unit for applying the voltage to the first layer, a first optical irradiating unit for irradiating a first optical spot onto the first layer, and a second optical irradiating unit for irradiating a second optical spot onto the second layer after irradiating the first optical spot onto the first layer.

    摘要翻译： 一种信息记录装置，包括具有包含电铬材料的第一层的多层信息记录介质，向第一层施加电压以使第一层着色的电极层，含有电色材料的第二层， 向第一层施加电压，第一光学照射单元，用于将第一光点照射到第一层上;以及第二光学照射单元，用于在将第一光斑照射到第一层上之后将第二光斑照射到第二层上 。

    Optical disc drive
    6.
    发明授权
    Optical disc drive 有权
    光盘驱动器

    公开(公告)号：US06477129B2

    公开(公告)日：2002-11-05

    申请号：US09794913

    申请日：2001-02-28

    申请人： Koichi Maruyama ,  Takeshi Shimano ,  Shigeru Nakamura ,  Akira Arimoto ,  Kazuo Shigematsu

    发明人： Koichi Maruyama ,  Takeshi Shimano ,  Shigeru Nakamura ,  Akira Arimoto ,  Kazuo Shigematsu

    IPC分类号： G11B700

    CPC分类号： G11B7/1374 ,  G11B7/0901 ,  G11B7/0908 ,  G11B7/0916 ,  G11B7/12 ,  G11B7/123 ,  G11B7/127 ,  G11B7/131 ,  G11B7/1353 ,  G11B7/139 ,  G11B2007/0006 ,  G11B2007/13727

    摘要： An optical disc drive using either one of a first disc (e.g., DVD) and a second disc (e.g., CD), is provided with a first laser diode that emits a shorter wavelength beam, a second laser diode that emits a longer wavelength beam, an objective lens, and a driving unit that holds and rotates the optical disc. The optical axis of the objective lens is inclined relative to a normal to the optical disc. The first laser diode is located at a first position so that the coma, which is caused when the first laser beam is converged on a data recording surface of the first disc, is minimized, and the second laser diode is located at a second position so that the coma, which is caused when the second laser beam is converged on a data recording surface of the second disc, is minimized.

    摘要翻译： 使用第一盘（例如DVD）和第二盘（例如CD）中的任一个的光盘驱动器设置有发射较短波长束的第一激光二极管，发射较长波长束的第二激光二极管 ，物镜，以及保持和旋转光盘的驱动单元。 物镜的光轴相对于光盘的法线倾斜。 第一激光二极管位于第一位置，使得当第一激光束会聚在第一盘的数据记录表面上时引起的彗差被最小化，并且第二激光二极管位于第二位置 当第二激光束会聚在第二盘的数据记录表面上时引起的彗差被最小化。