Capacitance detector for video disk

Details Capacitance detector for video disk Capacitance detector for video disk

1982-06-29

1985-08-13

Psitos, Aristotelis M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Electrical modification or sensing of storage medium

369129, G11B 900, G11B 300

Patent

active

045354359

ABSTRACT:
A capacitance detector for detecting a capacitance variation from a video disk and demodulating the capacitance variation into an electric signal, comprises a first block which includes a fixed oscillator, and a coupling loop comprised of a coupling coil and a coupling capacitor, the inductance of the fixed oscillator being inductively coupled with the coupling loop; and a second block which includes a disk stylus resonator having its resonance frequency varied by the capacitance variation of the video disk. A shield plate separates the first block from the second block and a coupling window is provided which inductively couples the coupling loop with the resonant inductance of the disk stylus resonator.

REFERENCES:
patent: 4080625 (1978-03-01), Kawamoto et al.
patent: 4150395 (1979-04-01), Pritchard

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