发明授权
- 专利标题： Magneto-optic recording/reproduction apparatus for minimizing variation in focusing error signals caused by variation in optical source wavelength
- 专利标题（中）： 用于最小化由光源波长变化引起的聚焦误差信号变化的磁光记录/再现装置
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申请号： US800846申请日： 1991-11-29
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公开(公告)号： US5297114A公开(公告)日： 1994-03-22
- 发明人: Tsuyoshi Itoh , Isao Okuda , Toshiyuki Kase , Hiroshi Nishikawa , Ryoto Ogawa , Masahiro Oono , Koichi Maruyama , Makoto Iki , Isao Takahashi
- 申请人： Tsuyoshi Itoh , Isao Okuda , Toshiyuki Kase , Hiroshi Nishikawa , Ryoto Ogawa , Masahiro Oono , Koichi Maruyama , Makoto Iki , Isao Takahashi
- 申请人地址： JPX Tokyo
- 专利权人： Asahi Kogaku Kogyo Kabushiki Kaisha
- 当前专利权人： Asahi Kogaku Kogyo Kabushiki Kaisha
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX2-335934 19901130; JPX3-128867 19910314
- 主分类号： G11B7/09
- IPC分类号： G11B7/09 ; G11B7/00
摘要：
In the magneto-optic recording/reproduction apparatus, a light beam from a semiconductor laser that can be used with two wavelengths, for recording and reproduction is converged by an objective lens on a magneto-optic disk, a predetermined offset is added to this focusing error signal by an offset adjusting circuit, and the objective lens is driven in the direction of the optical axis based on the focusing error signal to which an offset was added.
公开/授权文献
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