发明授权
- 专利标题: Optical information processing apparatus in which the offset of a tracking error signal is corrected in accordance with a relationship stored in a memory, in response to a position detection output signal
- 专利标题(中): 光信息处理装置,其中响应于位置检测输出信号,根据存储在存储器中的关系来校正跟踪误差信号的偏移
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申请号: US374222申请日: 1995-01-18
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公开(公告)号: US5517475A公开(公告)日: 1996-05-14
- 发明人: Osamu Koyama , Tadashi Kato , Masayuki Usui , Yoshihiko Watanabe , Hisatoshi Baba , Hirotake Ando , Hideo Nakajima , Shinji Sakai , Kenji Tamaki
- 申请人: Osamu Koyama , Tadashi Kato , Masayuki Usui , Yoshihiko Watanabe , Hisatoshi Baba , Hirotake Ando , Hideo Nakajima , Shinji Sakai , Kenji Tamaki
- 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: JPX1-203069 19890804
- 主分类号: G11B7/085
- IPC分类号: G11B7/085 ; G11B7/09 ; G11B7/125 ; G11B7/13
摘要:
An optical information processing apparatus includes an optical head for irradiating a light beam onto an optical recording medium, an objective lens, mounted on the optical head, for condensing the light beam onto the recording medium, a photodetector for receiving a light beam from the recording medium and for generating a tracking error signal indicative of a positional deviation between a light beam irradiated position and a track, a tracking actuator for moving the objective lens in a direction intersecting tracks of the recording medium, a tracking controller for driving the tracking actuator in accordance with the tracking error signal so as to correct the positional deviation, a position detector for detecting a relative position of the objective lens with respect to the optical head in the direction intersecting the tracks, a measuring device for measuring a relationship between an offset of the tracking error signal and a position of the objective lens from the tracking error signal and an output of the position detector, a memory for storing the relationship measured by the measuring device and a correction device for correcting the offset of the tracking error signal in accordance with the stored relationship, in response to the position detector output signal.
公开/授权文献
- US4525666A Cell breakdown 公开/授权日:1985-06-25