Selectively erasable optical memory system utilizing a photo exc

Details Selectively erasable optical memory system utilizing a photo exc Selectively erasable optical memory system utilizing a photo exc

1974-08-16

1976-08-31

Fears, Terrell W.

Communications: electrical

Digital comparator systems

340173LM, 340173LS, G11C 1122, G11C 1142

Patent

active

039784584

ABSTRACT:
The present invention relates to photo excitable ferroelectric optical memory system designed to store, erase, and display light traces. In accordance with the invention, there is provided a system wherein a photo-ferroelectric plate is placed between a polarizer and a polarization analyzer. Under the combined action of a recording radiation and an external electric field, a photo induced electric is formed in the illuminated zones of the plate. Erasure is obtained by re-illuminating the plate without applying any external field. The optical display is achieved by means of an electric read-out field.

REFERENCES:
patent: 3517206 (1970-06-01), Oliver
patent: 3602904 (1971-08-01), Cummings
patent: 3614754 (1971-10-01), Cummings
patent: 3740734 (1973-06-01), Maloanado
patent: 3792449 (1974-02-01), Kazan
patent: 3823998 (1974-07-01), Yazaki
patent: 3835459 (1974-09-01), Luke

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