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13 条记录 (耗时 0.014 秒)

    Optical head device
    2.
    发明公开
    Optical head device 失效
    Anordnung eines optischen Kopfes。

    公开(公告)号：EP0402123A2

    公开(公告)日：1990-12-12

    申请号：EP90306170.3

    申请日：1990-06-06

    申请人： SHARP KABUSHIKI KAISHA

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

    IPC分类号： G11B7/12 ,  G11B7/135

    CPC分类号： G11B7/0916 ,  G11B7/0903 ,  G11B7/0912 ,  G11B7/13 ,  G11B7/1353

    摘要： The invention discloses an optical head device (10) having:-
    a diffraction grating element (3) divided into a first diffraction grating (3a) and a second diffraction grating (3b) by a plane including an optical axis that connects a light emitting point on a semiconductor laser (1) to a focal point on a recording medium (6) such as an optical disk, so that the first and second diffraction gratings have a substantially equal diffraction angle, a substantially equal optical utilization efficiency, and different focal distances of first order diffracted lights, each of the first order diffracted lights being produced from a reflected light from the recording medium, at the respective diffraction gratings; and
    a photodetector (7) positioned at a mid-position between two focal points produced when there occurs no focusing error, the photo-detecting means having a plurality of photo-detecting parts juxtaposed in a direction substantially orthogonal to an average diffracting direction of the diffraction grating element.
    In this optical head, the first diffraction grating and second diffraction grating are designed such that lights diffracted at the first diffraction grating and second diffraction grating are guided into the photo-detecting means to form light spots in the vicinity of centers of the corresponding photo-detecting parts, and the light spots are aligned in a direction substantially orthogonal to the average diffracting direction of the diffraction grating element. The above arrangement enables to produce a small size optical head device and improve the detection of focusing errors and tracking errors.

    摘要翻译： 本发明公开了一种光学头装置（10），其具有： - 衍射光栅元件（3），被分为第一衍射光栅（3a）和第二衍射光栅（3b），所述衍射光栅元件包括光轴，该光轴将发光点 在半导体激光器（1）上到达诸如光盘的记录介质（6）上的焦点，使得第一和第二衍射光栅具有基本相等的衍射角，基本相等的光学利用效率和不同的焦距 的一级衍射光，在各衍射光栅处，来自记录介质的反射光产生一级衍射光; 以及光电检测器（7），其位于当不发生聚焦误差时产生的两个焦点之间的中间位置处，所述光检测装置具有多个光检测部件，所述光检测部件沿与所述光检测器的平均衍射方向大致正交的方向并置 衍射光栅元件。 在该光头中，第一衍射光栅和第二衍射光栅被设计成使得在第一衍射光栅和第二衍射光栅处衍射的光被引导到光检测装置中，以在相应的光电二极管的中心附近形成光点， 检测部分，并且光点在与衍射光栅元件的平均衍射方向基本正交的方向上对准。 上述布置使得能够产生小尺寸的光学头装置，并且改善了聚焦误差和跟踪误差的检测。

    An optical information recording and reproducing device
    6.
    发明公开
    An optical information recording and reproducing device 失效
    Gerätzur Aufzeichnung und Wiedergabe von optischen Informationen。

    公开(公告)号：EP0554092A1

    公开(公告)日：1993-08-04

    申请号：EP93300638.9

    申请日：1993-01-28

    申请人： SHARP KABUSHIKI KAISHA

    发明人： Nakata, Yasuo ,  Yoshida, Yoshio ,  Miyake, Takahiro ,  Sato, Hideaki ,  Kurata, Yukio ,  Yamamoto, Hiroyuki ,  Ogata, Nobuo ,  Kubo, Katsuhiro

    IPC分类号： G11B7/135

    CPC分类号： G11B7/1353

    摘要： An optical information recording and reproducing device is provided. The device includes a light source for emitting a light beam, a first diffraction element for splitting the light beam into at least three diffracted beams, an optical system guiding the diffracted beams to a recording medium, and a second diffraction element including at least one division line and a diffraction surface from which the diffracted beams are diffracted. The diffraction surface is divided into at least two regions by the division line or lines. One of the division lines is at a predetermined angle against the direction of a track on the recording medium, and the regions split each of the diffracted beams into at least two parts to diffract the parts in different directions. The device also includes an optical detecting element for detecting the light beams diffracted with the second diffraction element.

    摘要翻译： 提供了一种光信息记录和再现装置。 该装置包括用于发射光束的光源，用于将光束分成至少三个衍射光束的第一衍射元件，将衍射光束引导到记录介质的光学系统，以及包括至少一个分割部分的第二衍射元件 线衍射面和衍射光束衍射的衍射面。 通过分割线或线将衍射面分成至少两个区域。 分割线之一相对于记录介质上的轨道的方向成预定角度，并且区域将每个衍射光束分成至少两个部分，以在不同方向上衍射各部分。 该装置还包括用于检测与第二衍射元件衍射的光束的光学检测元件。

    An optical pickup apparatus and a hologram element used for same
    8.
    发明公开
    An optical pickup apparatus and a hologram element used for same 失效
    Optische Abtastvorrichtung und holographisches Elementdafür。

    公开(公告)号：EP0545735A1

    公开(公告)日：1993-06-09

    申请号：EP92311108.2

    申请日：1992-12-04

    申请人： SHARP KABUSHIKI KAISHA

    发明人： Miyake, Takahiro ,  Yoshida, Yoshio ,  Kubo, Katsuhiro ,  Ueyama, Tetsuo ,  Kurata, Yukio

    IPC分类号： G11B7/135 ,  G11B7/085

    CPC分类号： G11B7/1353 ,  G02B5/32 ,  G11B7/08564 ,  G11B11/10532 ,  G11B11/10556

    摘要： An optical pickup apparatus including a light emitting source (10), a hologram element (7) for scanning a recording medium (22) with light beams emitted from the light emitting source (10), a hologram lens (8) for focusing the light beams introduced from the hologram element (7) on the recording medium (22), an optical detector (9) for detecting the light beams reflected from the recording medium (22), and a first optical system for directing the light beams reflected from the recording medium (22) to the optical detector (9). The hologram element (7) includes an optical diffraction grating for diffracting the light beams emitted from the light emitting source (10) and a control means for controlling the rotation of the hologram element (7) in a swinging manner. The hologram element (7) can have hologram gratings on both surfaces thereof; one of them has a pattern of straight lines and the other has a pattern of concentric circles to obtain a widened deflection angle.

    摘要翻译： 一种光拾取装置，包括发光源（10），用于利用从发光源（10）发射的光束扫描记录介质的全息元件（7），用于聚焦光的全息透镜（8） 从记录介质（22）上的全息元件（7）引入的光束，用于检测从记录介质（22）反射的光束的光学检测器（9），以及用于引导从记录介质 记录介质（22）到光学检测器（9）。 全息元件（7）包括用于衍射从发光源（10）发射的光束的光学衍射光栅和用于以摆动方式控制全息元件（7）的旋转的控制装置。 全息元件（7）可以在其两个表面上具有全息光栅; 其中一个具有直线的图案，另一个具有同心圆的图案以获得加宽的偏转角。

    Manufacturing method of optical diffraction grating element
    9.
    发明公开
    Manufacturing method of optical diffraction grating element 失效
    光学衍射元件的制造方法

    公开(公告)号：EP0428390A3

    公开(公告)日：1992-05-27

    申请号：EP90312388.3

    申请日：1990-11-13

    申请人： SHARP KABUSHIKI KAISHA

    发明人： Sakai, Keiji ,  Kubo, Katsuhiro ,  Kurata, Yukio

    IPC分类号： G02B5/18

    CPC分类号： G02B5/1857

    摘要： The method of manufacturing an optical diffraction grating element of the present invention is characterized in adopting an ion beam made from a gas chemically reacting with a glass substrate when forming a diffraction grating having a serrated profile upon the glass substrate through an ion beam etching method. Also, when manufacturing an optical diffraction grating element that is divided into a plurality of regions whereon diffraction gratings having different diffraction angles with respect to an incident light are provided, the method of the present invention is characterized in forming slits into a resist film disposed upon a transparent substrate such as a glass substrate, in accordance with the patterns of the diffraction gratings, such that the width of the slits is constant irrespectively of the regions. Accordingly, the method of manufacturing - an optical diffraction grating element of the present invention enables to improve the diffraction efficiency of the optical diffraction grating element, and to enhance the optical efficiency of an optical head device. The SN ratio of the output signals released by the optical head device may be thus improved and the servo error control executed accurately.