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16 条记录 (耗时 0.04 秒)

    Device for and method of reducing cross talk in optical disk device
    2.
    发明授权
    Device for and method of reducing cross talk in optical disk device 失效
    减少光盘装置串扰的装置和方法

    公开(公告)号：US5373437A

    公开(公告)日：1994-12-13

    申请号：US740726

    申请日：1991-08-06

    申请人： Tsuyoshi Itoh ,  Isao Okuda ,  Hiroshi Nishikawa ,  Toshiyuki Kase ,  Ryota Ogawa ,  Masahiro Oono ,  Koichi Maruyama ,  Makoto Iki

    发明人： Tsuyoshi Itoh ,  Isao Okuda ,  Hiroshi Nishikawa ,  Toshiyuki Kase ,  Ryota Ogawa ,  Masahiro Oono ,  Koichi Maruyama ,  Makoto Iki

    IPC分类号： G02B7/28 ,  G11B7/09 ,  G11B7/095 ,  G11B7/00

    CPC分类号： G11B7/0909

    摘要： A device in which an offset is added to a focusing error signal to control an objective lens and thereby reduce the generation of cross-talk when a beam spot that is converged on an optical disk crosses over a wall of a groove of a track of the disk. By adding the offset to the focusing error signal, the objective lens is moved out of focus with the disk. Thus, the shape of a beam spot formed on a photo sensor is changed from a circle to an ellipse. A condenser lens provided for forming the beam spot is moved along the optical axis thereof in such a manner that an output of a recorded signal of the disk is at a maximum value. As a result, the objective lens is brought into focus on the disk. Thereafter, the objective lens is focused on the disk in accordance with the focusing error signal to which the offset is added, while maintaining the beam spot in the shape of an ellipse.

    摘要翻译： 一种装置，其中偏移量被加到聚焦误差信号上以控制物镜，从而当会聚在光盘上的束斑横跨在光盘的轨道的凹槽的壁上时减少串扰的产生 磁盘。 通过将偏移量加到聚焦误差信号上，物镜与光盘移出对焦。 因此，形成在光传感器上的光斑的形状从圆形变为椭圆形。 设置用于形成束斑的聚光透镜沿其光轴移动，使得盘的记录信号的输出处于最大值。 结果，将物镜聚焦在盘上。 此后，根据添加有偏移量的聚焦误差信号将物镜聚焦在光盘上，同时将光束点保持为椭圆形状。

    Roof surface measuring apparatus
    10.
    发明授权
    Roof surface measuring apparatus 失效
    屋面测量仪

    公开(公告)号：US5379105A

    公开(公告)日：1995-01-03

    申请号：US964959

    申请日：1992-10-22

    申请人： Makoto Iki ,  Hirofumi Matsuo ,  Masahiro Oono ,  Masato Noguchi

    发明人： Makoto Iki ,  Hirofumi Matsuo ,  Masahiro Oono ,  Masato Noguchi

    IPC分类号： G01B11/26 ,  G01B11/00

    CPC分类号： G01B11/26

    摘要： An interferometer causes a reference beam and a subject beam reflected from a roof surface to interfere with each other to form an interference fringe, which is detected by an image detecting element in its measuring area. Detection data from the image detecting element is processed by an image processing circuit, and then subjected to phase difference detection. A continuous function is determined as an approximation to a relationship between phase data and unit measuring areas located in a direction perpendicular to a line corresponding to a ridge line of the roof surface. A analysis relating to a roof angle is performed based on the continuous function thus determined.

    摘要翻译： 干涉仪使得参考光束和从屋顶表面反射的对象光束彼此干涉以形成由其测量区域中的图像检测元件检测的干涉条纹。 来自图像检测元件的检测数据由图像处理电路处理，然后进行相位差检测。 确定连续功能作为相位数据与位于垂直于与屋顶表面的脊线对应的线的方向的单位测量区域之间的关系的近似。 基于如此确定的连续函数进行与屋顶角度有关的分析。