Video disc reproducing apparatus

Details Video disc reproducing apparatus Video disc reproducing apparatus

1983-03-07

1986-12-16

Faber, Alan

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

369 50, 369126, 369244, G11B 907, G11B 2102

Patent

active

046302514

ABSTRACT:
A video disc reproducing apparatus is provided with a pickup by which the information recorded on a video disc is detected as a variation in electrostatic capacity. The signal output from the pickup is processed so as to generate a control signal proportional to the logarithm of the pickup signal. This control signal is then utilized to control the pressure of the pickup on the video disc. Element functions of the apparatus may be combined such that an automatic gain control device may also serve to generate the logarithmic control signal.

REFERENCES:
patent: 3623734 (1971-11-01), Sakamoto
patent: 3830505 (1974-08-01), Rabinow
patent: 4317052 (1982-02-01), Morris
patent: 4340956 (1982-07-01), Miller
patent: 4492930 (1985-01-01), Knowles
Patent Abstracts of Japan, vol. 6, No. 30, Feb. 23, 1982 and JP-A-56-148703.

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