Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1990-11-08
1992-08-18
Envall, Jr., Roy N.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4425, 369 4429, 369 4411, G11B 700
Patent
active
051405768
ABSTRACT:
A method of and an apparatus for setting into operation a focusing control for bringing a focal point of a beam onto a recording surface of an optical disk such that the beam reproduces signals from the recording surface, in which a relative velocity between the focal point and the recording surface is detected on the basis of an output of a focusing error detection device for detecting a gap between the focal point and the recording surface and velocity of a displacement device for driving the focal point in a direction perpendicular to the recording surface is controlled on the basis of the detected relative velocity such that focusing control can be stably set into operation by starting focusing control after controlling the relative velocity.
REFERENCES:
patent: 4541084 (1985-09-01), Oku et al.
patent: 4651314 (1987-03-01), Yoshikawa et al.
patent: 4733066 (1988-03-01), Konno et al.
Moriya Mitsuro
Shibano Masayuki
Yamada Shin-ichi
Yamaguchi Hiroyuki
Envall Jr. Roy N.
Matsushita Electric - Industrial Co., Ltd.
Tran Thang V.
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