Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – To produce multiple image on medium or plural radiant energy...
Patent
1979-11-26
1981-03-17
Martin, Jr., Roland E.
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
To produce multiple image on medium or plural radiant energy...
430 31, 430103, 430126, 355 3R, G03G 1322, G03G 1304
Patent
active
042568200
ABSTRACT:
My invention comprises an improved method of electrophotography which enables me to increase the effective speed of a photoconductor. The speed at which copies may be made is a function of the quantum of light falling on the photoconductive surface and the conductivity of the photoconductor under illumination. Since the rate at which a given photoconductor discharges the surface potential on the photoconductor through the action of light is limited, speed can be increased for a given photoconductor only by increasing the illumination. This requires energy and produces heat. My process deliberately underexposes a charged photoconductor to a light and shade image of the original to produce a weak latent electrostatic image of low contrast which is insufficient to make a satisfactory copy. I then mask the latent image with a liquid-carried toner while preventing deposition of the toner on the background areas. I then discharge the background areas with a blanket illumination of low intensity. The optical mask prevents the image areas from discharging while enhancing the constrast of the weak latent image. The enhanced image is then easily developed by any known developing method for making latent electrostatic images visible at a development station.
REFERENCES:
patent: 2756676 (1956-07-01), Steinhilper
patent: 3251685 (1966-05-01), Bickmore
patent: 3262806 (1966-06-01), Gourge
patent: 3322537 (1967-05-01), Giamo
patent: 3355288 (1967-11-01), Matkan
patent: 3945822 (1976-03-01), Verhille
patent: 4135927 (1979-01-01), Draugelis et al.
Martin Jr. Roland E.
Savin Corporation
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