发明授权
US5444233A Optical or magnetooptical information recording/reproducing apparatus
and a focusing pull-in method for such apparatus generating a light
beam for focusing error signal detection
失效
用于产生用于聚焦误差信号检测的光束的这种装置的光学或磁光信息记录/再现装置和聚焦拉入方法
- 专利标题： Optical or magnetooptical information recording/reproducing apparatus and a focusing pull-in method for such apparatus generating a light beam for focusing error signal detection
- 专利标题（中）： 用于产生用于聚焦误差信号检测的光束的这种装置的光学或磁光信息记录/再现装置和聚焦拉入方法
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申请号： US111564申请日： 1993-08-24
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公开(公告)号： US5444233A公开(公告)日： 1995-08-22
- 发明人: Kenichi Sasaki
- 申请人： Kenichi Sasaki
- 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： JPX4-257613 19920902
- 主分类号： G11B7/09
- IPC分类号： G11B7/09 ; G11B7/125 ; G01J1/20
摘要：
An optical information recording/reproducing apparatus includes a semiconductor laser having plural light emitting parts within a chip, so that plural light spots are formed on an information recording medium to effect recording/reproduction of information and focusing error signal detection, utilizing plural light beams emitted from the plural light emitting parts. Light spots other than a light spot for the focusing error signal detection are turned off until a focusing pull-in operation is completed.
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