Communications: electrical – Digital comparator systems
Patent
1976-01-21
1977-09-27
Canney, Vincent P.
Communications: electrical
Digital comparator systems
340173LS, G03G 1600
Patent
active
040514633
ABSTRACT:
Method and apparatus for inverting the polarity of an input image formed on a surface of an 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, reflective layer is raster scanned by information containing light through the photoconductor layer with voltage applied between the conductive electrodes, the elastomer and deformable electrode being deformed in accordance with the input informaton. The image projected from the surface of the deformable electrode is positive, light characters on a dark background. In order to project a negative image (dark characters on a light background), the device is initially flooded with light through the photoconductor layer with voltage applied between the conductive electrodes. The voltage is then removed and the device is shorted for a predetermined time period. With the device shorted, the photoconductor layer is raster scanned by an information containing light spot, the light spot writing characters in selected areas by erasing the background thereat. The short is then removed and the voltage reapplied, the background and written characters being restored, a negative image of high contrast being projected from the surface of the deformable electrode.
REFERENCES:
patent: 3526879 (1970-09-01), Gundlach et al.
patent: 3795514 (1974-03-01), Juirblis et al.
patent: 3906462 (1975-09-01), Feinleib 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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