再颁专利
- 专利标题: Optical disc apparatus
- 专利标题(中): 光盘装置
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申请号: US10750527申请日: 2003-12-31
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公开(公告)号: USRE41372E1公开(公告)日: 2010-06-08
- 发明人: Yuu Okada , Kenji Fujiune , Katsuya Watanabe , Takeharu Yamamoto , Jun Kikuchi
- 申请人: Yuu Okada , Kenji Fujiune , Katsuya Watanabe , Takeharu Yamamoto , Jun Kikuchi
- 申请人地址: JP Osaka
- 专利权人: Panasonic Corporation
- 当前专利权人: Panasonic Corporation
- 当前专利权人地址: JP Osaka
- 代理机构: Snell & Wilmer L.L.P.
- 优先权: JP11-258578 19990913
- 主分类号: G11B7/00
- IPC分类号: G11B7/00
摘要:
An optical disc apparatus includes: a converging section for converging a light beam and irradiating a rotating information medium with the converged light beam; a moving section for moving the converging section, thereby moving a converging point of the converged light beam in a direction perpendicular to an information surface of the information medium; a converging state detection section for generating a focus servo signal which represents a converging state of the light beam on the information medium based on reflected light or transmitted light of the light beam from the information medium; a focus servo control section for controlling the moving section based on the focus servo signal, so that the light beam reaches a predetermined converging state on the information medium; and a focus pull-in section for turning ON the control by the focus servo control section, wherein the focus pull-in section turns ON the control by the focus servo control section in a case where the focus pull-in section determines that the converging point of the light beam is located in the vicinity of the minimum velocity position on the information medium axial deviation.
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