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    Focus error detector
    1.
    发明授权
    Focus error detector 失效
    聚焦误差检测器

    公开(公告)号：US5537384A

    公开(公告)日：1996-07-16

    申请号：US364983

    申请日：1994-12-28

    申请人： Chul-woo Lee ,  Chong-sam Chung ,  Jan-hoon Yoo ,  Kyung-hwa Rim

    发明人： Chul-woo Lee ,  Chong-sam Chung ,  Jan-hoon Yoo ,  Kyung-hwa Rim

    IPC分类号： G11B7/09 ,  G11B7/095 ,  G11B7/135 ,  G11B7/00

    CPC分类号： G11B7/1356 ,  G11B7/0912 ,  G11B7/095

    摘要： A focus error detector for detecting a focus error of an objective lens with respect to an optical disk. The focus error detector includes a beam splitter for splitting light reflected from the optical disk. Two critical angle prisms having critical angle reflecting surfaces are included for respectively reflecting the light rays from the beam splitter at the respective critical angles onto two bisectional photo-detectors. The bisectional photo-detector generates detecting signals responsive to the amount of light received. The detecting signals are differentiated and added in a direction offsetting a shift or tilt of the reflected light. Accordingly, only the focus error signal is detected, irrespective of the tilt and shift of the optical axis of the reflected light. Thus, malfunction of an optical pickup is prevented, thereby providing for the uncorrupted recording and reproduction of data.

    摘要翻译： 一种用于检测物镜相对于光盘的聚焦误差的聚焦误差检测器。 聚焦误差检测器包括用于分离从光盘反射的光的分束器。 包括具有临界角反射表面的两个临界角棱镜，用于分别将来自分束器的光线以各自的临界角反射到两个二分光电检测器上。 二分光电检测器响应于所接收的光量产生检测信号。 检测信号在偏移反射光的偏移或倾斜的方向上被微分并相加。 因此，不管反射光的光轴的倾斜和偏移如何，仅检测聚焦误差信号。 因此，防止了光学拾取器的故障，由此提供数据的不良记录和再现。

    Reproducing and recording optical pickup compatible with discs having different thicknesses
    3.
    发明授权
    Reproducing and recording optical pickup compatible with discs having different thicknesses 失效
    复制和记录与不同厚度的光盘兼容的光学拾取器

    公开(公告)号：US5777973A

    公开(公告)日：1998-07-07

    申请号：US761826

    申请日：1996-12-06

    申请人： Jang-hoon Yoo ,  Chong-sam Chung ,  Chul-woo Lee ,  Kyung-hwa Rim ,  Kun-ho Cho

    发明人： Jang-hoon Yoo ,  Chong-sam Chung ,  Chul-woo Lee ,  Kyung-hwa Rim ,  Kun-ho Cho

    IPC分类号： G11B7/09 ,  G11B7/00 ,  G11B7/0037 ,  G11B7/08 ,  G11B7/125 ,  G11B7/13 ,  G11B7/135

    CPC分类号： G11B7/1353 ,  G11B7/131 ,  G11B7/133 ,  G11B7/1367 ,  G11B7/1381 ,  G11B2007/0006 ,  G11B2007/13727 ,  G11B7/0037 ,  G11B7/0909

    摘要： A reproducing/recording optical pickup compatible with discs having different thicknesses includes a transparent plate having a central portion formed with a diffraction grating pattern for diffracting the light travelling from the light source to the objective lens, and a transparent portion through which the light passes, and a photodetector having first and second light receiving portions. The zero-order transmitted light and the passing light are focused using all regions of the aperture of the objective lens with respect to a thin disc. The positive first-order diffracted light diffracted by the diffraction grating pattern of the transparent plate is focused onto a thick disc by partial regions of the objective lens. Then, the reflected lights thereof are detected by the first and second light receiving portions, respectively. Because signals for reproduction and servo for each disc are detected as the detection signals of the first and second light receiving portions, stable servo and noiseless reproduction are possible, irrespective of the thickness of the disc used.

    摘要翻译： 与具有不同厚度的光盘兼容的再现/记录光学拾取器包括透明板，其具有形成有衍射光栅图案的中心部分，用于将从光源传播的光衍射到物镜，以及光通过的透明部分， 以及具有第一和第二光接收部分的光电检测器。 使用物镜的孔径的相对于薄盘的所有区域聚焦零级透射光和通过光。 由透明板的衍射光栅图案衍射的正一级衍射光被物镜的部分区域聚焦在厚盘上。 然后，其反射光分别由第一和第二光接收部分检测。 由于每个盘的再现和伺服信号被检测为第一和第二光接收部分的检测信号，所以与所使用的盘的厚度无关，可以进行稳定的伺服和无噪声再现。

    Focus error detection with two symmetrically splitted reflected beams
    4.
    发明授权
    Focus error detection with two symmetrically splitted reflected beams 失效
    使用两个对称分裂的反射光束进行聚焦误差检测

    公开(公告)号：US5594714A

    公开(公告)日：1997-01-14

    申请号：US366255

    申请日：1994-12-29

    申请人： Chul-woo Lee ,  Kyung-hwa Rim ,  Pyong-yong Seong ,  Chong-sam Chung

    发明人： Chul-woo Lee ,  Kyung-hwa Rim ,  Pyong-yong Seong ,  Chong-sam Chung

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

    CPC分类号： G11B7/131 ,  G11B7/0908 ,  G11B7/0917 ,  G11B7/0943

    摘要： In an optical pickup, a focus error detector for detecting a focus error of an objective lens for an optical disk includes a focusing lens for focusing the reflected light of the optical disk, a diffraction optical device for diffracting the reflected light focused by the focusing lens into two light rays, two bi-segmented photo-detectors for receiving the two split light rays, respectively, and a circuit for outputting a desired focus error signal from the signal detected from the photo-detectors. The circuit outputs a pure focus error signal without errors created by the deviation of the light amount in the photo-detectors due to the tilt or shift of the reflected light, thereby contributing to the stable operation and miniaturization of the optical pickup.

    摘要翻译： 在光拾取器中，用于检测光盘的物镜的聚焦误差的聚焦误差检测器包括：用于聚焦光盘的反射光的聚焦透镜;用于衍射由聚焦透镜聚焦的反射光的衍射光学装置 分别用于接收两个分开的光线的两个双段光电检测器和用于从从光电检测器检测的信号中输出所需的聚焦误差信号的电路。 由于反射光的倾斜或偏移，电路输出纯聚焦误差信号，而不会由于光检测器中光量的偏差而产生误差，从而有助于光拾取器的稳定操作和小型化。

    Inverse image generating method apparatus thereof and focus error detecting method using the same and apparatus thereof
    7.
    发明授权
    Inverse image generating method apparatus thereof and focus error detecting method using the same and apparatus thereof 失效
    其反像图像生成方法装置和使用其的聚焦误差检测方法及其装置

    公开(公告)号：US5699339A

    公开(公告)日：1997-12-16

    申请号：US508253

    申请日：1995-07-27

    申请人： Chul-woo Lee ,  Chong-sam Chung ,  Jang-hoon Yoo ,  Kyung-hwa Rim

    发明人： Chul-woo Lee ,  Chong-sam Chung ,  Jang-hoon Yoo ,  Kyung-hwa Rim

    IPC分类号： G11B7/08 ,  G11B7/09 ,  G11B7/135 ,  G11B7/00

    CPC分类号： G11B7/1356 ,  G11B7/0908 ,  G11B7/0917 ,  G11B7/094 ,  G11B2007/0919

    摘要： In detecting a focus error for an optical pickup, an inverse image generator for generating inverse images onto a light beam reflected from an optical disk is used in a focus error detecting method and apparatus thereof. The inverse image generator is composed of a semi-transmissive plane for splitting a light beam into first and second light beams, first and second prisms for inverting the phase of the second light beam, and third and fourth prisms for synthesizing the phase-inverted second light beam with the first light beam. Also, the inverse image generator has two quadrant wave plates, a polarization plane and light synthesizing plane for preventing a light loss. Since the errors due to an optical axis variation is eliminated from the focus error signal detected from the synthetic light beam radiated by the inverse generator, the optical pickup can be driven with stability.

    摘要翻译： 在检测光拾取器的聚焦误差时，在聚焦误差检测方法及其装置中使用用于在从光盘反射的光束上产生反转图像的逆图像发生器。 逆图像生成器由用于将光束分割为第一和第二光束的半透射平面，用于反转第二光束的相位的第一和第二棱镜以及用于合成相位反转的第二棱镜的第三和第四棱镜 光束与第一光束。 此外，逆图像生成器具有两个象限波片，一个用于防止光损失的偏振面和光合成平面。 由于从由逆发生器辐射的合成光束检测到的聚焦误差信号中消除了由于光轴变化引起的误差，所以可以稳定地驱动光学拾取器。

    Optical detector with two detecting regions for reproducing and recording information on two kinds of disks having different thicknesses
    9.
    发明授权
    Optical detector with two detecting regions for reproducing and recording information on two kinds of disks having different thicknesses 失效
    具有两个检测区域的光学检测器，用于在具有不同厚度的两种盘上再现和记录信息

    公开(公告)号：US5802037A

    公开(公告)日：1998-09-01

    申请号：US708988

    申请日：1996-09-06

    申请人： Chul-woo Lee ,  Kyung-hwa Rim ,  Chong-sam Chung ,  Kun-ho Cho ,  Jang-hoon Yoo ,  Soo-yeul Jung

    发明人： Chul-woo Lee ,  Kyung-hwa Rim ,  Chong-sam Chung ,  Kun-ho Cho ,  Jang-hoon Yoo ,  Soo-yeul Jung

    IPC分类号： G11B7/08 ,  G11B7/00 ,  G11B7/09 ,  G11B7/13

    CPC分类号： G11B7/131 ,  G11B7/0909 ,  G11B7/133 ,  G11B2007/0006

    摘要： An optical pickup device which is capable of reproducing and recording information from/onto at least two kinds of discs having different thicknesses includes a light source, an objective lens provided along the light path from the light source facing the plane of a disc and having a predetermined effective diameter, a beam splitter provided between the objective lens and the light source, and a photodetector for detecting the beam split from the light splitter and reflected from the disc, wherein the photodetector has a first detection region and a second detection region provided in the peripheral portion of the first detection region. The optical pickup device is simplified and the manufacturing cost therefor is low. Also, by reducing the spherical aberration effect for the light, discs having different thicknesses can be used for a single disc drive.

    摘要翻译： 能够从具有不同厚度的至少两种光盘再现和记录信息的光学拾取装置包括：光源，沿着从光源面向光盘面的光路设置的物镜，具有 设置在所述物镜和所述光源之间的分束器，以及用于检测从所述分光器分离并从所述光盘反射的光束的光电检测器，其中所述光电检测器具有第一检测区域和设置在所述光源中的第二检测区域 第一检测区域的周边部分。 光拾取装置简化，制造成本低。 此外，通过减小光的球面像差效应，可以将具有不同厚度的盘用于单个盘驱动器。

    Critical angle focus error detector
    10.
    发明授权
    Critical angle focus error detector 失效
    临界角聚焦误差检测器

    公开(公告)号：US5629514A

    公开(公告)日：1997-05-13

    申请号：US458165

    申请日：1995-06-02

    申请人： Chul-woo Lee ,  Chong-sam Chung ,  Jang-hoon Yoo ,  Kyung-hwa Rim

    发明人： Chul-woo Lee ,  Chong-sam Chung ,  Jang-hoon Yoo ,  Kyung-hwa Rim

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

    CPC分类号： G11B7/1356 ,  G11B7/0908 ,  G11B7/0917 ,  G11B7/0943 ,  G11B2007/0919

    摘要： A focus error detector for detecting a signal representing a degree of a focus error of an objective lens with respect to an optical disk in an optical pickup, in order to eliminate errors due to an optical axis shift or tilt of the reflected light reflected from the optical disk, includes a diffraction device for diffracting and splitting the reflected light reflected. The focus error detector a critical angle reflector having critical angle reflecting planes for reflecting the two diffracted light rays at two critical angles, two bi-segmented photo-detectors for receiving the two diffracted light rays reflected from the critical angle reflector, respectively, and detecting signals depending on the received light amount, and a circuit for differentiating and summing each signal of the two bi-segmented photo-detectors so as to offset the light amount difference due to the tilt or shift of the reflected light and outputting a desired signal. Therefore, only an original focus error signal is output, irrespective of an optical shift or tilt of the reflected light, so that malfunction of the optical pickup is prevented and clean recording and reproduction is enabled.

    摘要翻译： 一种聚焦误差检测器，用于检测表示物镜相对于光学拾取器中的光盘的聚焦误差的程度的信号，以便消除由于光学偏移反射的反射光的光轴偏移或倾斜引起的误差 光盘包括用于衍射和分裂反射的反射光的衍射装置。 聚焦误差检测器，具有用于以两个临界角度反射两个衍射光线的临界角反射面的临界角反射镜，分别用于接收从临界角反射器反射的两个衍射光线的两个双段光电检测器， 信号，以及用于对两个双分段光电检测器的每个信号进行微分和求和以便偏移由于反射光的倾斜或偏移引起的光量差异并输出所需信号的电路。 因此，不管反射光的光学偏移或倾斜如何，仅输出原始聚焦误差信号，从而防止光学拾取器的故障，并且能够进行清洁的记录和再现。