Static information storage and retrieval – Information masking – Thermoplastic
Patent
1976-01-21
1977-12-13
Canney, Vincent P.
Static information storage and retrieval
Information masking
Thermoplastic
365112, G03G 1600, G11C 1142
Patent
active
040632229
ABSTRACT:
Method and apparatus for selectively erasing information formed on the surface of image recording device which deforms when illuminated in the presence of an electrostatic field applied thereacross. The image recording device, comprising a layered structure consisting of a conductive transparent substrate, a photoconductive layer, a deformable elastomer layer and a deformable electrode, is initially raster scanned by information containing light on the photoconductor layer with voltage applied between the conductive electrodes whereby the elastomer and deformable electrode are deformed in accordance with the input information. For selective erasure, the voltage is removed and the device is short-circuited. With the device shorted, the area to be erased is scanned with the spot of light. The short is then removed and the voltage reapplied, the remainder of the information except for the area erased, being restored. Additional information can be written in the erased area if desired.
REFERENCES:
patent: 3526879 (1970-09-01), Gundlach et al.
patent: 3795514 (1974-03-01), Jvirblis et al.
patent: 3906462 (1975-09-01), Fernlab et al.
patent: 3980476 (1976-09-01), Wysocki
Bright Clark I.
Snyder Jan S.
Canney Vincent P.
Melser Allen S.
Ralabate James J.
Weiss Franklyn C.
Xerox Corporation
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