发明授权
US4812638A Focusing error detector and optical data detecting device incorporating
the focusing error detector
失效
聚焦误差检测器和结合了聚焦误差检测器的光学数据检测装置
- 专利标题： Focusing error detector and optical data detecting device incorporating the focusing error detector
- 专利标题（中）： 聚焦误差检测器和结合了聚焦误差检测器的光学数据检测装置
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申请号： US78773申请日： 1987-07-28
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公开(公告)号： US4812638A公开(公告)日： 1989-03-14
- 发明人: Nobuo Ogata , Yasuo Nakata , Hideaki Satou , Toshiyuki Tanaka , Etsuji Minami , Yoshio Yoshida , Yukio Kurata , Teruaki Inoue, deceased
- 申请人： Nobuo Ogata , Yasuo Nakata , Hideaki Satou , Toshiyuki Tanaka , Etsuji Minami , Yoshio Yoshida , Yukio Kurata , Teruaki Inoue, deceased
- 申请人地址： JPX Osaka
- 专利权人： Sharp Kabushiki Kaisha
- 当前专利权人： Sharp Kabushiki Kaisha
- 当前专利权人地址： JPX Osaka
- 优先权： JPX61-178513 19860728; JPX62-13611 19870123; JPX62-79241 19870331
- 主分类号： G11B7/09
- IPC分类号： G11B7/09 ; G11B7/135 ; G01J1/20
摘要：
A focusing error detector comprises a light source, a collimator lens for making parallel the pencil of rays emitted by the light source, an objective lens which focuses the parallel pencil of rays to form a beam spot on a data-recording disc with data tracks and guide tracks formed thereon and which receives the pencil of rays reflected from the data-recording disc, an optical system for forming a beam spot from the reflected pencil of rays incident to the objective lens, and an optical detector having a plurality of divided optical sensor blocks for receiving the formed beam spot so as to detect the focusing error of the beam spot formed on the data-recording disc on the basis of the configuration of the received beam spot.
公开/授权文献
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