Static information storage and retrieval – Information masking – Transparency
Patent
1978-05-23
1980-04-15
Fears, Terrell W.
Static information storage and retrieval
Information masking
Transparency
360102, 1791003G, 358302, G11C 1142, G11C 1304
Patent
active
041987012
ABSTRACT:
A mass archival optical recording and reproduction system includes a recording light source such as a laser beam focussed and directed upon an acousto-optic linear modulator array (or page composer) that receives parallel blocks of data converted from a serial stream of digital data to be stored. The page composer imparts to the laser beam modulation representative of a plurality of parallel channels of data and through focussing optics downstream of the page composer parallel arrays of optical spots are recorded upon a suitable recording medium such as a photographic film floppy disc. The recording medium may be substantially frictionlessly and stably positioned for recording at a record/read station by an air-bearing platen arrangement which is preferably thermodynamically non-throttling so that the recording film may be positioned in the path of the information-carrying light beam in a static or dynamic mode.
During readout, the page composer is bypassed and a readout light beam is focussed directly upon the recording medium containing an array of previously recorded digital spots, a sync bit, data positioning bits, and a tracking band. The readout beam which has been directed through the recording medium is then imaged upon a photodetector array, the output of which may be coupled to suitable electronic processing circuitry, such as a digital multiplexer, whereby the parallel spot array is converted back into the original serial data stream.
REFERENCES:
patent: 3327916 (1967-06-01), Weidenhammer
patent: 3582917 (1971-06-01), Hertrich
patent: 3891976 (1975-06-01), Carlsen
patent: 3899778 (1975-08-01), Roberts
Reddersen Brad R.
Roberts Howard N.
Zech Richard G.
Fears Terrell W.
Harris Corporation of Cleveland, Ohio
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