Capacitance distance sensor apparatus for video disc player/reco

Details Capacitance distance sensor apparatus for video disc player/reco Capacitance distance sensor apparatus for video disc player/reco

1978-09-14

1980-01-08

Konick, Bernard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791003V, 318662, 361280, 324 61QS, H04N 576, G11B 2120, G11B 1732

Patent

active

041830601

ABSTRACT:
A non-contact type, capacitance distance sensing probe having one or two electrodes disposed about one end of an objective lens system in an optical video disc system is used with a focus control servo loop to maintain focus of a light beam on the surface of a reflective disc record despite undesirable axial displacements of the surface when the record is rotated. The two electrode probe is balanced to provide immunity to variations in the impedance of the external circuit which grounds the disc.

REFERENCES:
patent: 3198880 (1965-08-01), Toulon
patent: 3515987 (1970-06-01), Zurbrick
patent: 3706919 (1972-12-01), Abbe
patent: 3783196 (1974-01-01), Stanley
patent: 3806668 (1974-04-01), Hilliker
patent: 3825323 (1974-07-01), Londwer
patent: 3873763 (1975-03-01), Jonssen

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