Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1990-08-06
1992-02-04
Richardson, Robert L.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
G11B 700
Patent
active
050864203
ABSTRACT:
Disclosed is an optical disk apparatus in which light which returns from a recording medium is led to an photodetector composed of a plurality of light-receiving elements, and focusing is controlled on the basis of an focus error signal which corresponds to the relative distance between an objective and the recording medium. Whether the focusing pull has been conducted normally or not is determined by comparing a standard added signal level which is set by a focus search to the level of an added signal generated after the focusing pull has been conducted.
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Olympus Optical Co,. Ltd.
Richardson Robert L.
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