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301 条记录 (耗时 0.029 秒)

    Optical disk apparatus for producing information recorded on a recording track
    44.
    发明授权
    Optical disk apparatus for producing information recorded on a recording track 失效
    用于产生记录在记录磁道上的信息的光盘装置

    公开(公告)号：US5440536A

    公开(公告)日：1995-08-08

    申请号：US202518

    申请日：1994-02-28

    申请人： Noboru Ito ,  Shinichi Tanaka ,  Hidenori Wada ,  Sadao Mizuno ,  Hideki Hayashi

    发明人： Noboru Ito ,  Shinichi Tanaka ,  Hidenori Wada ,  Sadao Mizuno ,  Hideki Hayashi

    IPC分类号： G11B7/00 ,  G11B7/0045 ,  G11B7/005 ,  G11B7/09 ,  G11B7/13

    CPC分类号： G11B7/131 ,  G11B7/0045 ,  G11B7/0943

    摘要： An optical disk apparatus includes a photodetector divided into eight segments which receive the laser beam reflected from the optical disk and produce signals based on the laser beam sport thereon. In this apparatus, these eight segments are combined in several patterns for the recorded information reproduction, the tracking error detection, and the focus error detection, respectively. For the recorded information reproduction, eight segments are used as combined in three segment cells RC1, RC2, and RC3 which extend in a direction parallel to each other such that the segment cell RC1 is in center and is sandwitched by other segment cell RC2 and RC3. The segment cells RC1, RC2, and RC3 are located perpendicular to the recording track of the optical disk and produce three signals C, R, and L indicative of the laser beam intensity of the laser beam spot thereon, respectively. Thus obtained signals C is multiplied by a constant K and then added to the other signals R and L. By selecting suitable value as the constant K, the crosstalk component in the reproduced signal can be reduced.

    摘要翻译： 光盘装置包括被分成八个部分的光电检测器，其接收从光盘反射的激光束并基于其上的激光束运动产生信号。 在这种装置中，这八个段分别以记录信息再现，跟踪误差检测和聚焦误差检测的多种模式组合。 对于记录的信息再现，八个段被组合在三个分段单元RC1，RC2和RC3中，它们在彼此平行的方向上延伸，使得分段单元RC1处于中心并被其它分段单元RC2和RC3 。 分段单元RC1，RC2和RC3垂直于光盘的记录轨道定位，并分别产生表示激光束点的激光束强度的三个信号C，R和L。 这样获得的信号C乘以常数K，然后加到其他信号R和L.通过选择合适的值作为常数K，可以减少再现信号中的串扰分量。

    Focus detection device for reading information from an optical recording medium
    46.
    发明授权
    Focus detection device for reading information from an optical recording medium 失效
    用于从光学记录介质读取信息的对焦检测装置

    公开(公告)号：US5345072A

    公开(公告)日：1994-09-06

    申请号：US997293

    申请日：1992-12-23

    申请人： Hideki Hayashi ,  Shinichi Tanaka ,  Sadao Mizuno ,  Noboru Ito ,  Yoshiaki Komma

    发明人： Hideki Hayashi ,  Shinichi Tanaka ,  Sadao Mizuno ,  Noboru Ito ,  Yoshiaki Komma

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

    CPC分类号： G11B7/1353 ,  G11B7/0912

    摘要： A focus detection device for use in a focus detection device includes a main light source and two auxiliary light sources. These auxiliary light sources are offset to the main light source along the optical axis of the main optical system while being symmetrically positioned perpendicular to the optical axis. A exposure units having apertures are provided above the two auxiliary light sources for constricting the amount of auxiliary lights so that the convergence of the auxiliary beams on the optical disk is less than that of the main light beam. As a result, an optical system with a broad focus error detection range can be constructed while increasing the convergence of the main light beam.

    摘要翻译： 用于焦点检测装置的焦点检测装置包括主光源和两个辅助光源。 这些辅助光源沿着主光学系统的光轴偏移到主光源，同时垂直于光轴对称定位。 具有孔径的曝光单元设置在两个辅助光源上方，用于限制辅助光的量，使得辅助光束在光盘上的会聚小于主光束的会聚。 结果，可以在增加主光束的会聚的同时构造具有宽聚焦误差检测范围的光学系统。

    Optical pickup
    47.
    发明授权
    Optical pickup 失效
    光学拾音

    公开(公告)号：US5241528A

    公开(公告)日：1993-08-31

    申请号：US996173

    申请日：1992-12-23

    申请人： Masanari Mohri ,  Hironori Tomita ,  Atsushi Ishizuka ,  Tohru Nakamura ,  Shinichi Tanaka

    发明人： Masanari Mohri ,  Hironori Tomita ,  Atsushi Ishizuka ,  Tohru Nakamura ,  Shinichi Tanaka

    IPC分类号： G11B7/085 ,  G11B7/09 ,  G11B7/12 ,  G11B7/135 ,  G11B25/04

    CPC分类号： G11B7/0857 ,  G11B7/093 ,  G11B7/123

    摘要： An optical pickup having an optical disk (22); a laser diode (11); an objective lens for forming a beam spot on the optical disk; an optical element for guiding a beam from the laser diode to the objective lens; a photodetector for converting a reflected beam from the optical disk into an information signal and an error signal; an optical holder to which at least the objective lens is secured; a first circuit board (17) to which at least the laser diode and the photodetector are attached; an optical base to which the first circuit board (17), is secured; at least the laser diode, the optical element and the photodetector being sealed by the optical holder and the optical base so as to form an optical unit; a stationary member; a second circuit board (28) secured to the stationary member; an elastic support member (21) for elastically supporting the optical unit, which is electrically connected to the first and second circuit boards; at least one permanent magnet (23) secured to the optical unit; a first drive member for driving the optical unit in a direction substantially parallel to a rotational axis of the optical disk; and a second drive member for driving the optical unit in a direction substantially perpendicular to the rotational axis of the optical disk.

    摘要翻译： 一种具有光盘（22）的光学拾取器。 激光二极管（11）; 用于在光盘上形成束斑的物镜; 用于将来自激光二极管的光束引导到物镜的光学元件; 用于将来自光盘的反射光束转换为信息信号和误差信号的光电检测器; 至少固定有物镜的光学保持器; 至少安装有激光二极管和光电检测器的第一电路板（17）; 固定第一电路板（17）的光学基座; 至少激光二极管，光学元件和光电检测器被光学保持器和光学基座密封以形成光学单元; 固定构件 固定在固定部件上的第二电路板（28） 用于弹性支撑所述光学单元的弹性支撑构件（21），所述弹性支撑构件电连接到所述第一和第二电路板; 固定在所述光学单元上的至少一个永磁体（23） 第一驱动部件，用于沿与光盘的旋转轴线大致平行的方向驱动光学部件; 以及用于在基本上垂直于光盘的旋转轴线的方向上驱动光学单元的第二驱动构件。

    Apparatus and method for detecting intersymbol interference
    48.
    发明授权
    Apparatus and method for detecting intersymbol interference 失效
    用于检测符号间干扰的装置和方法

    公开(公告)号：US5206853A

    公开(公告)日：1993-04-27

    申请号：US661534

    申请日：1991-02-27

    申请人： Shinichi Tanaka

    发明人： Shinichi Tanaka

    IPC分类号： G11B7/00 ,  G11B7/004 ,  G11B7/0045 ,  G11B20/10 ,  G11B20/14 ,  G11B20/18

    CPC分类号： G11B20/10212 ,  G11B20/182

    摘要： An apparatus for detecting an intersymbol interference occurred in a digital signal during signal transmission includes a test pattern generator, which would produce the largest intersymbol interference on a recording medium and reading the test pattern therefrom. The apparatus further includes a measuring circuit for measuring short transition intervals representing one bit pattern and producing a reproduction signal, and a rectangular signal with, reference to a predetermined threshold. The apparatus includes a calculating circuit for calculating the total intersymbol interference by a bit length and measured transition intervals. Furthermore, the apparatus detects the total intersymbol interference by measuring long transition intervals representing four series of bit patterns and the short transition intervals.

    摘要翻译： 用于检测在信号传输期间在数字信号中发生的符号间干扰的装置包括测试图形发生器，其将在记录介质上产生最大的码间干扰并从其读取测试图案。 该装置还包括测量电路，用于测量表示一个位模式的短过渡间隔并产生再现信号，以及参考预定阈值的矩形信号。 该装置包括用于通过位长度和测量的过渡间隔来计算总符号间干扰的计算电路。 此外，该装置通过测量表示四个比特序列和短的过渡间隔的长的过渡间隔来检测总符号间干扰。