Title: Selectively erasable optical memory system utilizing a photo excitable ferroelectric storage plate

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.

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Inventors: Vergnolle, Marie (Paris, FR)
Rouchon, Jean Marc (Paris, FR)
Micheron, Francois (Paris, FR)

Application Number: 498218
Filing Date: 1974-08-16
Publication_date: 1976-08-31
Assignee: Thomson-CSF (Paris, FR)
Primary Class(es): 365/117 365/64, 365/145, 365/218, 430/495.1
Other Classes:
US Patent Ref:

3517206	Jun, 1970	Oliver	340/173.
3602904	Aug, 1971	Cummings	340/173.
3614754	Oct, 1971	Cummings	340/173.
3740734	Jun, 1973	Maloanado	340/173.
3792449	Feb, 1974	Kazan	340/173.
3823998	Jul, 1974	Yazaki	340/173.
3835459	Sep, 1974	Luke	340/173.

Other Refs:
Primary Examiner: Fears, Terrell W.
Assistant Examiner:
Attorney: Cushman, Darby and Cushman