Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1988-01-21
1991-03-05
McElheny, Jr., Donald
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
350255, G11B 708
Patent
active
RE0335487
ABSTRACT:
A laser beam 11 focused to a spot 12 by an objective lens 30 for following an information track 24 on a video disc is subject to three mutually orthogonal deviations; lateral or tracking, focus, and time axis or jitter. To correct these the lens is mounted in a second holder 9, in turn flexibly mounted by spring strips 13a, 13b to a first holder 1, in turn rotatably and slidably mounted to a base 4 by a shaft and bearing 3, 2. Various permanent magnets 7, 10 and coils 5, 6, 8 cooperable therewith are disposed such that selected coil energizations move the lens relative to the information track to correct any detected deviations.
REFERENCES:
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patent: 4462096 (1984-07-01), Xusaka
patent: 4467463 (1984-08-01), Yano
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Patent Abstracts of Japan, vol. 7, No. 26 (P-172) [1171], Feb. 2, 1983; & JP-A-57 179 955 (Nippon Victor K.K.) 05-11-1982.
Patent Abstracts of Japan, vol. 7, No. 51 (P-179) [1190], Feb. 26, 1983; & JP-A-57 198 518 (Nippon Victor K.K.) 06-12-1982.
McElheny Jr. Donald
Mitsubishi Denki & Kabushiki Kaisha
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