Radial transmission cancellation device

Details Radial transmission cancellation device Radial transmission cancellation device

1982-04-02

1984-08-14

McElheny, Jr., Donald E.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Electrical modification or sensing of storage medium

369129, H04N 583, G11B 906

Patent

active

044660901

ABSTRACT:
In a record playback system, such as a video disc player, there is tendency to radiate energy at a given frequency from the vicinity of the stylus where the stylus passes through the carriage bottom during playback. A first radial transmission waveguide path is provided in association with the carriage bottom. A second radial transmission waveguide path is provided between the carriage bottom and the record. The first and second paths are made to differ from one another by 180 electrical degrees. There is thus a reduction in radiated energy at the given frequency in the radial location which forms the common end of the first and second paths by signal cancellation at this common location.

REFERENCES:
patent: 3872240 (1975-03-01), Carlson et al.
patent: 3872265 (1975-03-01), Hilliker
patent: 4080625 (1978-03-01), Kawamoto et al.
patent: 4152641 (1979-05-01), Hughes et al.

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