Apparatus for detecting variation of electrostatic capacitance

Details Apparatus for detecting variation of electrostatic capacitance Apparatus for detecting variation of electrostatic capacitance

1982-11-09

1985-07-09

Faber, Alan

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Electrical modification or sensing of storage medium

369129, 324 60R, G11B 906

Patent

active

045286558

ABSTRACT:
An apparatus for detecting a variation of an electrostatic capacitance is advantageously utilized for reproducing information from a groove or pit formed on a disc of a CED type or a VHD type, for example, and comprises an oscillator and a resonance circuit each including a dielectric resonator, wherein the oscillator and the resonance circuit are capacitively coupled, while the resonance frequency of the resonance circuit is changed in accordance with a change of the electrostatic capacitance to be detected, whereby a signal output dependent on a variation of the electrostatic capacitance is obtained from a detector directly coupled to the resonance circuit.

REFERENCES:
patent: 3624315 (1971-11-01), Broce
patent: 3872240 (1975-03-01), Carlson
patent: 3952145 (1976-04-01), Allen
patent: 4080625 (1978-03-01), Kawamoto

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