发明授权
US07440362B2 Optical disc drive which uses a train of pulses to shift the focus of a focusing section
有权
使用一串脉冲来移动聚焦部分的焦点的光盘驱动器
- 专利标题: Optical disc drive which uses a train of pulses to shift the focus of a focusing section
- 专利标题(中): 使用一串脉冲来移动聚焦部分的焦点的光盘驱动器
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申请号: US10722875申请日: 2003-11-26
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公开(公告)号: US07440362B2公开(公告)日: 2008-10-21
- 发明人: Katsuya Watanabe , Shin-ichi Yamada , Kenji Fujiune , Yuuichi Kuze
- 申请人: Katsuya Watanabe , Shin-ichi Yamada , Kenji Fujiune , Yuuichi Kuze
- 申请人地址: JP Osaka
- 专利权人: Matsushita Electric Industrial Co., Ltd.
- 当前专利权人: Matsushita Electric Industrial Co., Ltd.
- 当前专利权人地址: JP Osaka
- 代理机构: Panitch Schwarze Belisario & Nadel LLP
- 优先权: JP2002-342010 20021126
- 主分类号: G11B7/00
- IPC分类号: G11B7/00
摘要:
An optical disc drive includes: a light source; a focusing section; a focus shifting section for shifting the focal point of light by changing the position of the focusing section perpendicularly to a data storage layer of a given optical disc in accordance with a control signal; a light receiving section for receiving, at multiple areas, the light reflected from the data storage layer and generating light quantity signals; a signal generating section for generating a focus error signal based on the light quantity signals; and a control section for generating the control signal responsive to the focus error signal such that the focal point is transferred to a focus controllable range. The control section generates the control signal such that the focal point is decelerated at a first acceleration and then at a second acceleration. The absolute value of the second acceleration is smaller than that of the first acceleration.
公开/授权文献
- US20040105358A1 Optical disc drive 公开/授权日:2004-06-03