Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1990-12-28
1992-06-23
Sikes, William L.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
G11B 700, G11B 2110
Patent
active
051249642
ABSTRACT:
A focus servo gain setting circuit for an optical record disc reproducing apparatus. The focus servo gain setting circuit includes a gain controllable amplifier, a laser light beam source, a lens drive circuit for generating a lens drive signal having a predetermined polarity, and an optical pickup for detecting data stored on the disc and generating data signals corresponding thereto. The optical pickup includes a lens which is movable in response to the lens drive signal and has a prescribed focal point and a focus circuit for generating focus error pulse signals in response to the movement of the focal point. The circuit further includes a circuit for adjusting the gain of the amplifier in response to receipt of each of a predetermined plurality of focus error pulse signals and a circuit responsive to the optical pickup for reversing the polarity of the lens drive signal for increasing the output rate of the focus error pulse signals.
REFERENCES:
patent: 4484319 (1984-11-01), Koishi et al.
patent: 4507765 (1985-03-01), Suzuki et al.
patent: 4689779 (1987-08-01), Hayashi et al.
Kabushiki Kaisha Toshiba
Sikes William L.
Wise Robert E.
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