发明授权
- 专利标题： Layer discriminating focus control apparatus, optical disk apparatus, and methods therefore
- 专利标题（中）： 因此，层鉴别对焦控制装置，光盘装置和方法
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申请号： US10391603申请日： 2003-03-20
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公开(公告)号： US07274630B2公开(公告)日： 2007-09-25
- 发明人: Sumitaka Maruyama , Masahiko Tanaka , Hideaki Ohsawa , Maho Kuwahara , Akihito Ogawa , Kazuto Kuroda
- 申请人： Sumitaka Maruyama , Masahiko Tanaka , Hideaki Ohsawa , Maho Kuwahara , Akihito Ogawa , Kazuto Kuroda
- 申请人地址： JP Tokyo
- 专利权人： Kabushiki Kaisha Toshiba
- 当前专利权人： Kabushiki Kaisha Toshiba
- 当前专利权人地址： JP Tokyo
- 代理机构： Pillsbury Winthrop Shaw Pittman, LLP
- 优先权： JP2002-079298 20020320
- 主分类号： G11B7/095
- IPC分类号： G11B7/095
摘要：
This invention relates to a focus control apparatus having a controller which generates a control signal and performs focus operation when the peak timing of a focus sum signal based on reflected light and the zero-crossing timing of a focus error signal are detected to substantially coincide with each other in supplying a control signal to a lens actuator driver for supplying a driving signal to a lens actuator for driving a lens. The invention also relates to an optical disk apparatus using the focus control apparatus. By detecting coincidence of the two timings, two reflected waves are discriminated, and stable focus operation is achieved.
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