Method for protecting a flexible record disc and disc so protect

Details Method for protecting a flexible record disc and disc so protect Method for protecting a flexible record disc and disc so protect

1975-06-17

1977-08-02

Lucas, Jay P.

Undertaking

1791003V, 274 42R, G11B 724, G11B 2300, G11B 700

Patent

active

040397645

ABSTRACT:
A flexible record disc engraved in the form of impressions along a track located in a ring-shaped zone is protected with a second flexible disc adhering at its central portion to the non-engraved part of the record disc. In the case where read-out is carried out on a stabilizing air cushion, the air remaining between the two discs is displaced by centrifugal force, so that good conditions of optical read-out are achieved.

REFERENCES:
patent: 1956626 (1934-05-01), Robbins
patent: 3009707 (1961-11-01), Schulein
patent: 3430966 (1969-03-01), Gregg
patent: 3518442 (1970-06-01), Johnson
patent: 3854729 (1974-12-01), Downs
patent: 3855426 (1974-12-01), Bouwhuis
"An Experimental Television Recording + Playback System Using Photographic Discs" Rice et al., Journal of SMPTE, vol. 79, No. 11.

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