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    Optical pickup apparatus and optical recording medium drive employing the same
    2.
    发明授权
    Optical pickup apparatus and optical recording medium drive employing the same 失效
    光拾取装置和采用该拾取装置的光记录介质驱动装置

    公开(公告)号：US6144623A

    公开(公告)日：2000-11-07

    申请号：US14980

    申请日：1998-01-28

    申请人： Yasuaki Inoue ,  Takenori Goto ,  Atsushi Tajiri ,  Kazushi Mori ,  Minoru Sawada ,  Akira Ibaraki ,  Masayuki Shono

    发明人： Yasuaki Inoue ,  Takenori Goto ,  Atsushi Tajiri ,  Kazushi Mori ,  Minoru Sawada ,  Akira Ibaraki ,  Masayuki Shono

    IPC分类号： G11B7/09 ,  G11B7/12 ,  G11B7/13 ,  G11B7/135 ,  G11B7/00

    CPC分类号： G11B7/1353 ,  G11B7/123 ,  G11B7/131 ,  G11B7/0912

    摘要： A transmission-type holographic optical element has a four-segment holographic surface divided into four regions of equal areas by virtual dividing lines which are perpendicular to each other. The first dividing line is at an angle with respect to the track direction of an optical disk and the second dividing line is at an angle with respect to the radial direction of the optical disk before tracking phase adjustment. The first dividing line coincides with the track direction of the optical disk and the second dividing line coincides with the radial direction of the optical disk after tracking phase adjustment. A four-segment photodetection part is divided into four photodetection parts of equal areas by a dividing line substantially parallel to the radial direction of the optical disk and a dividing line perpendicular thereto. Parts of a main beam diffracted in two regions located on first diagonal positions of the four-segment holographic surface are condensed as condensed spots on adjacent positions of the first dividing line of the four-segment photodetection part on opposite sides, and parts of the main beam diffracted in the remaining two regions located on second diagonal positions are condensed as condensed spots on separate positions of the second dividing line of the four-segment photodetection part on opposite sides.

    摘要翻译： 透射型全息光学元件具有通过彼此垂直的虚拟分割线被划分为相等面积的四个区域的四段全息表面。 第一分割线相对于光盘的轨道方向成一定角度，并且第二分割线在跟踪相位调整之前相对于光盘的径向方向成一定角度。 第一分割线与光盘的轨道方向一致，并且第二分割线在跟踪相位调整之后与光盘的径向一致。 四段光电检测部分通过基本上平行于光盘的径向的分割线和与其垂直的划分线分成四个具有相等面积的光电检测部分。 在四段全息表面的第一对角位置上的两个区域中衍射的主光束的部分在相对侧的四段光检测部分的第一分割线的相邻位置上被聚集为聚集点，主要部分 在位于第二对角位置的剩余两个区域中衍射的光束在相对侧的四段光检测部分的第二分割线的分离位置上被冷凝为聚光点。

    Optical pickup apparatus capable of suppressing offset of a tracking error signal
    4.
    发明授权
    Optical pickup apparatus capable of suppressing offset of a tracking error signal 失效
    能够抑制跟踪误差信号偏移的光拾取装置

    公开(公告)号：US06339563B2

    公开(公告)日：2002-01-15

    申请号：US09725239

    申请日：2000-11-29

    申请人： Kazushi Mori ,  Atsushi Tajiri ,  Yasuaki Inoue ,  Takenori Goto ,  Minoru Sawada ,  Akira Ibaraki ,  Daisuke Ide

    发明人： Kazushi Mori ,  Atsushi Tajiri ,  Yasuaki Inoue ,  Takenori Goto ,  Minoru Sawada ,  Akira Ibaraki ,  Daisuke Ide

    IPC分类号： G11B7095

    CPC分类号： G11B7/1353 ,  G11B7/0903 ,  G11B7/094

    摘要： A grating surface of a diffraction grating diffracts a laser beam emitted from a semiconductor laser device in ±1st order directions. The grating surface is formed in a rectangular or elliptic shape in such dimensions that a light spot formed on an objective lens by ±1st order diffracted beams is located in an aperture of the objective lens and not displaced from the aperture even if the objective lens is horizontally moved in a tracking operation. A grating surface of another diffraction grating has a width smaller than the width of an overlap region of a light spot on the diffraction grating corresponding to a part of a beam, diffracted in the +1st direction, entering an objective lens and a light spot on the diffraction grating corresponding to a part of a beam, diffracted in the −1st direction, entering the objective lens.

    摘要翻译： 衍射光栅的光栅表面衍射从半导体激光器件发射的激光束的±1级方向。 光栅表面形成为矩形或椭圆形，其尺寸使得物镜上形成的±1阶衍射光束的光点位于物镜的孔径中，即使物镜为 在跟踪操作中水平移动。 另一个衍射光栅的光栅表面的宽度小于衍射光栅上与光束的一部分相对应的光点的重叠区域的宽度，该光束的一部分在+ 1方向衍射，进入物镜和光点 衍射光栅对应于在第一方向衍射的光束的一部分，进入物镜。

    Optical pickup apparatus employing an adjusting circuit
    5.
    发明授权
    Optical pickup apparatus employing an adjusting circuit 失效
    采用调整电路的光拾取装置

    公开(公告)号：US06501715B2

    公开(公告)日：2002-12-31

    申请号：US09998295

    申请日：2001-12-03

    申请人： Kazushi Mori ,  Atsushi Tajiri ,  Yasuaki Inoue ,  Takenori Goto ,  Minoru Sawada ,  Akira Ibaraki ,  Daisuke Ide

    发明人： Kazushi Mori ,  Atsushi Tajiri ,  Yasuaki Inoue ,  Takenori Goto ,  Minoru Sawada ,  Akira Ibaraki ,  Daisuke Ide

    IPC分类号： G11B7095

    CPC分类号： G11B7/1353 ,  G11B7/0903 ,  G11B7/094

    摘要： A grating surface of a diffraction grating diffracts a laser beam emitted from a semiconductor laser device in ±1st order directions. The grating surface is formed in a rectangular or elliptic shape in such dimensions that a light spot formed on an objective lens by ±1st order diffracted beams is located in an aperture of the objective lens and not displaced from the aperture even if the objective lens is horizontally moved in a tracking operation. A grating surface of another diffraction grating has a width smaller than the width of an overlap region of a light spot on the diffraction grating corresponding to a part of a beam, diffracted in the ±1st direction, entering an objective lens and a light spot on the diffraction grating corresponding to a part of a beam, diffracted in the −1st direction, entering the objective lens.

    摘要翻译： 衍射光栅的光栅表面衍射从半导体激光器件发射的激光束的±1级方向。 光栅表面形成为矩形或椭圆形，其尺寸使得物镜上形成的±1阶衍射光束的光点位于物镜的孔径中，即使物镜为 在跟踪操作中水平移动。 另一个衍射光栅的光栅表面的宽度小于衍射光栅上与光束的一部分相对应的光点的重叠区域的宽度，该光束的一部分在±1度方向上衍射，进入物镜和光点 衍射光栅对应于在第一方向衍射的光束的一部分，进入物镜。

    Optical pickup apparatus capable of suppressing offset of a tracking error signal
    6.
    发明授权
    Optical pickup apparatus capable of suppressing offset of a tracking error signal 失效
    能够抑制跟踪误差信号偏移的光拾取装置

    公开(公告)号：US06181667B2

    公开(公告)日：2001-01-30

    申请号：US09041008

    申请日：1998-03-12

    申请人： Kazushi Mori ,  Atsushi Tajiri ,  Yasuaki Inoue ,  Takenori Goto ,  Minoru Sawada ,  Akira Ibaraki ,  Daisuke Ide

    发明人： Kazushi Mori ,  Atsushi Tajiri ,  Yasuaki Inoue ,  Takenori Goto ,  Minoru Sawada ,  Akira Ibaraki ,  Daisuke Ide

    IPC分类号： G11B7135

    CPC分类号： G11B7/1353 ,  G11B7/0903 ,  G11B7/094

    摘要： A grating surface of a diffraction grating diffracts a laser beam emitted from a semiconductor laser device in ±1st order directions. The grating surface is formed in a rectangular or elliptic shape in such dimensions that a light spot formed on an objective lens by ±1st order diffracted beams is located in an aperture of the objective lens and not displaced from the aperture even if the objective lens is horizontally moved in a tracking operation. A grating surface of another diffraction grating has a width smaller than the width of an overlap region of a light spot on the diffraction grating corresponding to a part of a beam, diffracted in the +1st direction, entering an objective lens and a light spot on the diffraction grating corresponding to a part of a beam, diffracted in the −1st direction, entering the objective lens.

    摘要翻译： 衍射光栅的光栅表面衍射从半导体激光器件发射的激光束的±1级方向。 光栅表面形成为矩形或椭圆形，其尺寸使得物镜上形成的±1阶衍射光束的光点位于物镜的孔径中，即使物镜为 在跟踪操作中水平移动。 另一个衍射光栅的光栅表面的宽度小于衍射光栅上与光束的一部分相对应的光点的重叠区域的宽度，该光束的一部分在+ 1方向衍射，进入物镜和光点 衍射光栅对应于在第一方向衍射的光束的一部分，进入物镜。

    Optical pickup device and optical recording medium driving apparatus comprising the same
    7.
    发明授权
    Optical pickup device and optical recording medium driving apparatus comprising the same 失效
    光学拾取装置和包括该拾取装置的光学记录介质驱动装置

    公开(公告)号：US6023448A

    公开(公告)日：2000-02-08

    申请号：US997742

    申请日：1997-12-24

    申请人： Atsushi Tajiri ,  Takenori Goto ,  Yasuaki Inoue ,  Kazushi Mori ,  Minoru Sawada ,  Akira Ibaraki

    发明人： Atsushi Tajiri ,  Takenori Goto ,  Yasuaki Inoue ,  Kazushi Mori ,  Minoru Sawada ,  Akira Ibaraki

    IPC分类号： G11B7/12 ,  G11B7/125 ,  G11B7/135 ,  G11B7/22 ,  G11B7/00

    CPC分类号： G11B7/1353 ,  G11B7/123 ,  G11B7/127 ,  G11B7/22

    摘要： An optical pickup device has a case constructed by joining a lower frame member and an upper frame member. A semiconductor laser device, a three-beam generating diffraction grating, a transmission type holographic optical element, and a reflecting mirror are arranged in the lower frame member. A lead frame is arranged in the lower frame member. The semiconductor laser device is arranged on the lead frame through a heat sink, to emit laser light in a horizontal direction. A photodiode and the lead frame are arranged in the upper frame member. The photodiode has a light receiving surface parallel to the direction of light emission from the semiconductor laser device, and is mounted on the lead frame. The laser light emitted from the semiconductor laser device passes through the three-beam generating diffraction grating and the transmission type holographic optical element, and is then bent upward and introduced into an optical recording medium. Returned light reflected from a recording surface of the optical recording medium is changed in a direction parallel to the direction of light emission from the semiconductor laser device, passes through the transmission type holographic optical element and the three-beam generating diffraction grating again, is then changed vertically upward by the reflecting mirror, and is incident on the photodiode.

    摘要翻译： 光学拾取装置具有通过连接下框架构件和上框架构件构成的壳体。 半导体激光装置，三光束产生衍射光栅，透射型全息光学元件和反射镜布置在下部框架构件中。 引导框架布置在下框架构件中。 半导体激光器件通过散热器布置在引线框架上，以沿水平方向发射激光。 光电二极管和引线框架布置在上框架构件中。 光电二极管具有与半导体激光装置的发光方向平行的受光面，安装在引线框上。 从半导体激光装置发射的激光通过三光束产生衍射光栅和透射型全息光学元件，然后向上弯曲并被引入光记录介质。 从光记录介质的记录表面反射的返回光在与半导体激光装置的发光方向平行的方向上变化，然后再次通过透射型全息光学元件和三光束产生衍射光栅 由反射镜垂直向上变化，入射到光电二极管上。

    Three-beam generating diffraction grating, transmission type holographic optical element and optical pickup apparatus using the same
    9.
    发明授权
    Three-beam generating diffraction grating, transmission type holographic optical element and optical pickup apparatus using the same 失效
    三光束产生衍射光栅，透射型全息光学元件和使用其的光学拾取装置

    公开(公告)号：US5717674A

    公开(公告)日：1998-02-10

    申请号：US671197

    申请日：1996-06-27

    申请人： Kazushi Mori ,  Atsushi Tajiri ,  Yasuaki Inoue

    发明人： Kazushi Mori ,  Atsushi Tajiri ,  Yasuaki Inoue

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

    CPC分类号： G11B7/1353 ,  G11B7/127 ,  G11B2007/0006

    摘要： An optical pickup apparatus includes a semiconductor laser generating a light having a short wavelength for reproduction of a high-density information recording medium and a semiconductor laser outputting a light for reproduction of an information recording medium with low recording density. A three-beam generating diffraction grating, a transmission type holographic optical element and a condenser lens are disposed in the light path in which the laser lights from the semiconductor lasers propagate toward the recording surface of an information recording medium. The laser light emitted from each semiconductor laser is transmitted through the three-beam generating diffraction grating and divided into three beams and then transmitted through the transmission type holographic optical element and passed through the condenser lens to reach the recording surface of the information recording medium. The transmission type holographic optical element is formed so that the product of the diffraction efficiency of the laser light in the forward optical path and the separated diffraction efficiency of the returned light increases as the wavelength of the laser light decreases. The three-beam generating diffraction grating has grooves with such depth that the diffraction efficiency of the main beam in the three-divided beams is smaller and the diffraction efficiency of the sub-beams is larger as the wavelength of the laser light is shorter.

    摘要翻译： 光拾取装置包括：半导体激光器，其产生用于再现高密度信息记录介质的短波长的光;以及输出用于再现记录密度低的信息记录介质的光的半导体激光器。 在来自半导体激光器的激光朝向信息记录介质的记录表面传播的光路中设置三光束产生衍射光栅，透射型全息光学元件和聚光透镜。 从每个半导体激光器发射的激光通过三光束产生衍射光栅传输并分成三个光束，然后通过透射型全息光学元件透射并通过聚光透镜到达信息记录介质的记录表面。 透射型全息光学元件形成为使得正向光路中的激光的衍射效率与返回的光的分离的衍射效率的乘积随着激光的波长而减小。 三光束产生衍射光栅具有凹槽，其深度使得三分光束中的主光束的衍射效率较小，并且激光的波长较短时子束的衍射效率较大。