发明授权
- 专利标题： Optical head and optical information reading apparatus
- 专利标题（中）： 光头和光信息读取装置
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申请号： US82303申请日： 1993-06-28
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公开(公告)号： US5490129A公开(公告)日： 1996-02-06
- 发明人: Kazuhiko Matsuoka , Seiichiro Satomura , Katuya Yamazaki , Takeshi Yamawaki
- 申请人： Kazuhiko Matsuoka , Seiichiro Satomura , Katuya Yamazaki , Takeshi Yamawaki
- 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： JPX4-192804 19920629
- 主分类号： G11B11/10
- IPC分类号： G11B11/10 ; G11B7/13 ; G11B11/105 ; G11B7/26
摘要：
An optical head is used in a magnetic field modulation type magnetooptical recording/reproducing apparatus. The optical head includes a device for irradiating a magnetooptical record medium with a light beam, a separating device for separating a reflected light beam from the magnetooptical record medium into two beams to be projected onto a single plane, a single photodetector provided with two two-divided light receiving portions for respectively receiving the two beams, and a single convex lens element for forming images of the two beams as light spots on the single photodetector.
公开/授权文献
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