发明授权
US5150345A Optical information recording apparatus provided with means for sampling and holding a servo signal when the intensity of a light beam varies between intensity levels 失效
光信号记录装置提供了在强光等级下的光束强度取样和保持伺服信号的手段

  • 专利标题: Optical information recording apparatus provided with means for sampling and holding a servo signal when the intensity of a light beam varies between intensity levels
  • 专利标题(中): 光信号记录装置提供了在强光等级下的光束强度取样和保持伺服信号的手段
  • 申请号: US794644
    申请日: 1991-11-18
  • 公开(公告)号: US5150345A
    公开(公告)日: 1992-09-22
  • 发明人: Satoshi ShikichiShigeto Kanda
  • 申请人: Satoshi ShikichiShigeto Kanda
  • 申请人地址: JPX Tokyo
  • 专利权人: Canon Kabushiki Kaisha
  • 当前专利权人: Canon Kabushiki Kaisha
  • 当前专利权人地址: JPX Tokyo
  • 优先权: JPX62-200037 19870812
  • 主分类号: G02B7/28
  • IPC分类号: G02B7/28 G11B7/0033 G11B7/09
Optical information recording apparatus provided with means for sampling
and holding a servo signal when the intensity of a light beam varies
between intensity levels
摘要:
An optical information recording apparatus includes a recording device for condensing a light beam into a spot-like shape, the light beam having been intensity-modulated between at least two levels which are not zero, scanning the light beam on a recording medium and recording information thereon; a detector for detecting a signal indicative of the position error between the light beam spot and the medium in the focusing direction perpendicular to the surface of the medium or the tracking direction in a plane parallel to the surface of the medium which is perpendicular to tracks formed on the medium; a servo device for correcting the position error on the basis of the detected signal; a device for varying the gain of the servo device in conformity with the intensity level of the light beam for producing a gain output; and a device for sampling and holding the gain output as the intensity of the light beam shifts between different levels.
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