Pickup circuitry for a video disc player with printed circuit bo

Details Pickup circuitry for a video disc player with printed circuit bo Pickup circuitry for a video disc player with printed circuit bo

1976-11-18

1978-03-21

Cardillo, Jr., Raymond F.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791001B, 1791004M, 17910041G, H04N 576, G11B 2100

Patent

active

040806251

ABSTRACT:
Stylus, having a conductive electrode, is mounted at one end of a pivoted stylus support arm within a pickup cartridge body of non-conductive material, removably received in a conductive housing. A conductive spring, with one end in electrical contact with the stylus electrode, is secured at its opposite end to the cartridge body. A printed circuit board, mounted within the conductive housing, comprises a dielectric substrate bearing a conductive coating in several elongated surface regions. The conductive coating in two of said regions defines first and second conductors, lying substantially parallel to each other. When the cartridge is received in the housing, electrical contact is established between the body-secured spring end and one end of the first conductor. Capacitive elements couple the other end of the first conductor to the housing. The spring, first conductor, and housing form a transmission line, which resonates with the end-loading capacitive elements and a variable capacitance formed between stylus electrode and the disc record, at frequencies in a selected range. UHF oscillations at a frequency adjacent said range are inductively coupled to the transmission line. AM detector, connected to second conductor, recovers recorded information.

REFERENCES:
patent: 3418435 (1968-12-01), Norris
patent: 3806668 (1974-04-01), Hilliker
patent: 3872240 (1975-03-01), Carlson et al.
patent: 3872265 (1975-03-01), Hilliker
patent: 4030123 (1977-06-01), Taylor et al.
patent: 4030124 (1977-06-01), Allen
patent: 4038682 (1977-07-01), Allen

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