Dynamic information storage or retrieval – Specific detail of information handling portion of system – Electrical modification or sensing of storage medium
Patent
1981-10-21
1984-07-10
Cardillo, Jr., Raymond F.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Electrical modification or sensing of storage medium
369129, G11B 906
Patent
active
044596910
ABSTRACT:
A rotary recording medium reproducing apparatus comprises a rotary recording medium in which an information signal is recorded as variations in electrostatic capacitance, wherein the rotary recording medium is rotated, a reproducing stylus for making contact with and relatively scanning over the recording surface of the rotary recording medium upon reproduction, having an electrode for detecting the information signal as variations in electrostatic capacitance, a reference potential part functioning as a reference potential point, a first direct-current connection path for connecting the rotary recording medium with the reference potential part for direct-current, and a second direct-current connection path for connecting the reproducing stylus with the reference potential part for direct-current. The second direct-current connection path including a signal pickup circuit.
REFERENCES:
patent: 2548211 (1951-04-01), Frantz
patent: 3843846 (1974-10-01), Nutter
patent: 3872265 (1975-03-01), Hilliker
patent: 3873782 (1975-03-01), Palmer
patent: 4080625 (1978-03-01), Kawamoto et al.
patent: 4152641 (1979-05-01), Hughes et al.
patent: 4320491 (1982-03-01), Rustman
Cardillo, Jr. Raymond F.
Victor Company of Japan Ltd.
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