Copying method and apparatus

Photocopying – Including fiber optics

Patent

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Other Related Categories

355 14R, 355 14TR, 430 43, 430 44, G03G 1501

Type

Patent

Status

active

Patent number

044138997

Description

ABSTRACT:
A copying method for producing duplicates of an original of at least two colors by using a composite photosensitive member including more than two photosensitive layers, wherein the photosensitive member is subjected to charging more than twice and exposed to an optical image of the original more than once by changing charging and exposing conditions, to vary charge carried on the surface and in the interior of the photosensitive member. This causes two types of electrostatic image to be formed on the surface of the photosensitive member; one type includes image regions having a positive surface potential, a negative surface potential and a substantially zero surface potential respectively and the other type includes two image regions having different surface potentials of same polarity respectively, and one image regions of substantially zero surface potential, depending on differences in color between image regions of the original corresponding to the image regions on the photosensitive member. By suitably selecting charging and exposing conditions, it is possible to selectively carry out, by using a single copying apparatus, a copying mode in which duplicates are produced in several colors, a copying mode in which duplicates are produced in one color and a copying mode in which image regions of one color are erased.

REFERENCES:
patent: 4045218 (1966-08-01), McVeigh
patent: 4099860 (1978-07-01), Connin
patent: 4189224 (1980-02-01), Sakai

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