Capacitance detection type stylus for grooveless disc records an

Details Capacitance detection type stylus for grooveless disc records an Capacitance detection type stylus for grooveless disc records an

1981-05-08

1983-08-09

Stephan, Steven L.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Electrical modification or sensing of storage medium

369173, 369151, 29 2542, 51281R, 51326, G11B 346, G11B 906

Patent

active

043982824

ABSTRACT:
A cylindrical diamond body is shaped to form a truncated conical portion. A conductive layer is deposited on the diamond body extending from the truncated end to the other end of the body. The conical portion of the body with the conductive layer being attached thereto is lapped to remove portions of the layer and the diamond body to form a pair of substantially flat surfaces extending from the truncated end toward the opposite end leaving the conductive layer to form a narrow width electrode for picking just one information signal stored in the form of minute pits along a spiral track or concentric tracks.

REFERENCES:
patent: 2315358 (1982-02-01), Hedel
patent: 3826877 (1974-07-01), Leedom et al.
patent: 4098030 (1978-07-01), Fuhrer et al.
patent: 4165560 (1979-08-01), Matsumoto
patent: 4273967 (1981-06-01), Wada et al.

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