Pickup circuit for video disc including dual-gate FET with injec

Details Pickup circuit for video disc including dual-gate FET with injec Pickup circuit for video disc including dual-gate FET with injec

1981-09-30

1984-05-22

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

044505507

ABSTRACT:
A stylus, having a conductive electrode, is arranged to follow a spiral groove on a disc in a video disc player. Video and audio information are recorded in the bottom of the groove as relief variations. When relative motion is established between the stylus and the groove, the spacing between the stylus electrode and relief variations provide capacitance variations representative of the recorded video and audio. A dual-gate field-effect transistor is used in a pickup circuit to detect signals related to these capacitance variations. One gate of the transistor is coupled to the stylus electrode to detect capacitance variations while the other gate is coupled to a local oscillator to modulate the detected capacitance variations.

REFERENCES:
patent: 1590399 (1926-06-01), Tykocinski-Tykociner
patent: 3806668 (1974-04-01), Hilliker
patent: 3842194 (1974-10-01), Clemens
patent: 3920930 (1975-11-01), Sobczyk
patent: 3969756 (1976-07-01), Palmer et al.
patent: 4312013 (1982-01-01), Lang et al.
patent: 4320491 (1982-03-01), Rustman
Kawamoto et al., RCA Technical Notes TN No. 1210, Mailed 7/21/78, 3 sheets, Microwave Apparatus to Detect Small Capacitance Changes at 2.45 GHz.

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