发明授权
- 专利标题: Focus servo circuit for a magneto-optical disk recording and reproducing apparatus
- 专利标题(中): 用于磁光盘记录和再现装置的聚焦伺服电路
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申请号: US736981申请日: 1991-07-29
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公开(公告)号: US5263009A公开(公告)日: 1993-11-16
- 发明人: Yoshihiro Sasaki , Toru Sekiguchi
- 申请人: Yoshihiro Sasaki , Toru Sekiguchi
- 申请人地址: JPX Tokyo
- 专利权人: NEC Corporation
- 当前专利权人: NEC Corporation
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX2-200467 19900727
- 主分类号: G11B11/10
- IPC分类号: G11B11/10 ; G11B7/085 ; G11B7/09 ; G11B11/105 ; G11B7/00
摘要:
An apparatus for optically recording/reproducing data to/from a disc including a focus servo circuit which initially sets an objective lens of an optical head to a predetermined setting. This predetermined setting is such that a laser beam passing through the lens is focused on the disc at a point inside of the disc in the thickness direction. Then, the focus servo circuit fine tunes the objective lens position until the laser beam is focused onto a recording film located inside of the disc.
公开/授权文献
- US5743684A Adjustable drill hole jig for carpentry applications 公开/授权日:1998-04-28