Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record
Patent
1978-05-15
1979-06-19
Wolff, John H.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Disk record
360 86, 360133, 358128, G11B 552
Patent
active
041588673
ABSTRACT:
A video disc player is provided with a stabilizing disc which during playing is disposed at a small distance above the video disc, air being admissible through an inlet restriction between the stabilizing disc and the video disc so that locally a sub-atmospheric pressure is produced as a result of the centrifugal pumping action of the video disc. In order to prevent the video disc from being drawn along when the stabilizing disc is moved upwards, an air by-pass passage is provided which via air-valve means can be opened when playing of the video disc is terminated, so as to admit an increased air stream between the stabilizing disc and the rotating video disc in order to at least substantially eliminate the prevailing sub-atmospheric pressure.
REFERENCES:
patent: 3863266 (1975-01-01), Hoshino
patent: 4002826 (1977-01-01), Iemenschot
Iemenschot Johannes A.
Tops Adrianus C.
Briody Thomas A.
Cohen Simon L.
Streeter William J.
U.S. Philips Corporation
Wolff John H.
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