发明授权
- 专利标题： Optical information recording/reproducing apparatus capable of detecting tracking and/or focusing error and method therefor
- 专利标题（中）： 能够检测跟踪和/或聚焦误差的光信息记录/再现装置及其方法
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申请号： US788827申请日： 1997-01-27
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公开(公告)号： US5771214A公开(公告)日： 1998-06-23
- 发明人: Yoshihiro Saga
- 申请人： Yoshihiro Saga
- 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： JPX8-011454 19960126
- 主分类号： G11B7/00
- IPC分类号： G11B7/00 ; G11B7/004 ; G11B7/007 ; G11B7/09 ; G11B19/12
摘要：
In an optical information recording/reproducing apparatus capable of executing a first recording method for recording information on either one of a land portion and a groove portion of a recording medium and a second recording method for recording information on both of the land portion and the groove portion, the recording medium is irradiated with a light beam, and a tracking error signal and/or focusing error signal is generated from the reflected light upon irradiation of the light beam. The level of the error signal is compared with a reference level to detect a tracking error state and/or focusing error state. The reference level is adapted to be switched according to the first or second recording method.
公开/授权文献
- US4611655A Heat exchanger 公开/授权日：1986-09-16
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