Photocopying – Including fiber optics
Patent
1983-04-11
1985-06-11
Moses, R. L.
Photocopying
Including fiber optics
355 10, 118647, G03G 1500
Patent
active
045224846
ABSTRACT:
My invention comprises an improved method of electrophotography which enables me to increase the effective speed of a photoconductor. The distinguishing feature of xerography is the creation of an electrostatic image at some point in the process. Most conveniently, a photoconductor is charged in the dark and then exposed to a light and shade image of the original to produce a latent electrostatic image of the original. In order to make a satisfactory copy, the exposure time must be such that sufficient contrast is achieved to enable the latent image to be made visible by the application of a developer formed of inherently colored or pigmented minute charged particles. The speed at which copies may be made is the 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 applied surface potential through the action of light is limited, speed can be increased 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 image of low contrast which is insufficient to make a satisfactory copy. The latent image, however, is sufficient in contrast to enable me to provide an optical mask or shield over the image by toning it. I then discharge the background or non-image areas of the photoconductor by a blanket illumination of low intensity. The optical mask prevents the image areas from discharging while enhancing the contrast of the weak latent image. The enhanced image is 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), Giaimo
patent: 3355288 (1967-11-01), Matkan
patent: 4135927 (1979-01-01), Draugelis et al.
patent: 4161360 (1979-07-01), Smith
Moses R. L.
Savin Corporation
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