发明名称 |
Scanning servo system for optical-disc information reproducing apparatus |
摘要 |
A scanning servo system, that is, a focusing servo system or a tracking servo system, for an optical-disc information reproducing apparatus includes (a) a light source for generating a light beam to scan a selected track location on an optical-disc wherein the information is stored as a series of pits arranged in the form of the track; (b) an objective lens for applying a scanning spot of the light beam to the selected track location; (c) a transducer for converting an optical signal or an image of the pit into an electric signal; (d) an actuator for driving the objective lens in response to the electric signal in a direction vertical or radial to the optical-disc, thereby causing the scanning spot to scan the selected track location accurately, the actuator being variable in its response characteristics in response to the electric signal; (e) a circuit for detecting a dropout of the information on the selected track location and generating a responsive signal to the dropout of information; (f) a circuit for delaying the responsive signal to the dropout of information for one rotation period of the optical-disc; and (g) a circuit for lowering the response characteristics of the actuator in response to the responsive signal to the dropout of information through the delaying circuit.
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申请公布号 |
US4623994(A) |
申请公布日期 |
1986.11.18 |
申请号 |
US19830489770 |
申请日期 |
1983.04.29 |
申请人 |
TOKYO SHIBAURA DENKI KABUSHIKI KAISHA |
发明人 |
NABESHIMA, DAIKI;NAKANE, HIROSHI |
分类号 |
G02B7/28;G11B7/00;G11B7/004;G11B7/09;(IPC1-7):G11B7/00;G11B21/10 |
主分类号 |
G02B7/28 |
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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