RF Radial choke for use in record playback apparatus

Details RF Radial choke for use in record playback apparatus RF Radial choke for use in record playback apparatus

1982-04-02

1984-06-19

Richardson, Robert L.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Electrical modification or sensing of storage medium

H04N 580, G11B 906

Patent

active

044556381

ABSTRACT:
In a record playback system which includes a substantially enclosed conductive arm carriage to support and translate a stylus/stylus arm assembly and an oscillator in the carriage to provide a signal at a given frequency, a symmetrical choke is formed in conjunction with the bottom of the carriage. The symmetrical choke is dimensioned to place an open circuit at a given radial distance from the stylus opening in the carriage bottom to reduce the radiation of energy from the playback system in a band of frequencies including the given frequency, and/or reduce the playback system's susceptibility to radiation from outside sources.

REFERENCES:
patent: 3872240 (1975-03-01), Carlson et al.
patent: 3872265 (1975-03-01), Hilliker
patent: 4327432 (1982-04-01), Lang et al.
RCA Technical Note #1210 Jul. 21, 1978.

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