Dynamic information storage or retrieval – Specific detail of information handling portion of system – Electrical modification or sensing of storage medium
Patent
1983-04-08
1985-03-12
McElheny, Jr., Donald
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Electrical modification or sensing of storage medium
369173, 51283R, H04N 580, G11B 906
Patent
active
045049408
ABSTRACT:
A stylus suitable for use with a video disc player of a type in which signals representing changes in electrostatic capacity with respect to a video disc are detected, including a scanning surface brought into contact with the video disc for scanning same, a plurality of inclined surfaces, and a plurality of ridges formed by the inclined surfaces. At least one of several meeting points of the plurality of ridges located in a direction in which scanning is performed is chamfered to render the point blunt. A stylus of the aforesaid shape is produced by a grinding method consisting in using a grinder pan composed of a plate of soft resin having a coat of hard material applied to its surface and forcing a forward end of a stylus against such grinding pan.
REFERENCES:
patent: 3826877 (1974-07-01), Leedom et al.
patent: 4162510 (1979-07-01), Keizer
patent: 4165560 (1979-08-01), Matsumoto
patent: 4287689 (1981-09-01), Mindel et al.
patent: 4297312 (1981-10-01), Carroll et al.
patent: 4450551 (1984-05-01), Kudo et al.
Nishiguchi Takashi
Tamura Shingo
Hitachi , Ltd.
McElheny Jr. Donald
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