发明名称 |
Optical disc drive which uses a train of pulses to shift the focus of a focusing section |
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.
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申请公布号 |
US7440362(B2) |
申请公布日期 |
2008.10.21 |
申请号 |
US20030722875 |
申请日期 |
2003.11.26 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
WATANABE KATSUYA;YAMADA SHIN-ICHI;FUJIUNE KENJI;KUZE YUUICHI |
分类号 |
G11B7/00;G11B7/09;G11B7/085 |
主分类号 |
G11B7/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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