Optical information recording/reproducing system including novel
tracking system
    4.
    发明授权
    Optical information recording/reproducing system including novel tracking system 失效
    光信息记录/再现系统包括新颖的跟踪系统

    公开(公告)号:US5408452A

    公开(公告)日:1995-04-18

    申请号:US938254

    申请日:1992-10-13

    摘要: An optical information recording/reproducing system is disclosed in which optical information having guide grooves for tracking and information pits beforehand provided thereon is irradiated with a main light beam for the recording/reproduction of information and a pair of subsidiary light beams for the detection of tracking and the scanning loci of the centers of the subsidiary light beams are arranged on the optical information carrier on opposite sides of the scanning locus of the center of the main light beam, respectively, first and second means for generating electric signals having their amplitudes corresponding to the respective intensities of the subsidiary light beams reflected by the optical information carrier, third means for detecting a difference in amplitude between the electric output signals of the first and second means, fourth means for detecting Ac components of the electric output signals of the first and second means to detect a difference in amplitude between the AC components, and fifth means for selecting a detection output of the third means as tracking information when the subsidiary light beams scan a region on the optical information carrier where the information pits are not provided and selecting a detection output of the fourth means as tracking information when the subsidiary light beams scan a region on the optical information carrier where the information pits are provided.

    摘要翻译: PCT No.PCT / JP91 / 01737 Sec。 371日期:1992年10月13日 102(e)日期1992年10月13日PCT 1991年12月19日PCT PCT。 第WO93 / 12522号公报 日期:1993年6月24日。公开了一种光信息记录/再现系统,其中具有用于跟踪的信息凹槽和预先设置的信息凹坑的光学信息被照射用于记录/再现信息的主光束和一对辅助 用于检测跟踪的光束和辅助光束的中心的扫描轨迹分别布置在主光束中心的扫描轨迹的相对侧上的光学信息载体上,第一和第二装置 电信号的幅度对应于由光信息载体反射的辅助光束的各自的强度,第三装置,用于检测第一和第二装置的电输出信号之间的幅度差;第四装置,用于检测第一和第二装置的Ac分量 第一和第二装置的电输出信号以检测a中的差异 AC分量之间的距离,以及当辅助光束扫描没有提供信息坑的光信息载体上的区域时选择第三装置的检测输出作为跟踪信息的第五装置,并且选择第四装置的检测输出 作为辅助光束扫描光信息载体上提供信息坑的区域的跟踪信息。