Method and apparatus for electrophotography capable of changing

Details Method and apparatus for electrophotography capable of changing Method and apparatus for electrophotography capable of changing

1982-05-28

1984-12-04

Kittle, John E.

Photocopying

Including fiber optics

430 55, 430 67, 430100, G03G 1302

Patent

active

044860889

ABSTRACT:
A novel method and apparatus for electrophotography is disclosed which enables selection the mode of image formation among positive-positive, negative-positive and combinations thereof without any need of changing the polarity of developing toner. The present invention is made on the basis of a known electrophotographic system in which a photosensitive member composed of essentially an electrically conductive substrate, a photoconductive substance layer and an insulating surface layer and which comprises the steps of charging the insulating surface layer, image-wise exposing it to light so as to form a first image almost simultaneously with or some time after the charging step, subjecting it to corona discharge with nearly simultaneous image-wise exposure so as to form a second image and uniformly exposing the whole surface of the photosensitive medium to light so as to form an electrostatic latent image corresponding to a composite image resulting from the first and second images. According to the invention the first and second images to be formed are identical with each other and either one of the two images is selectively exposed to obtain the desired image.

REFERENCES:
patent: 4197119 (1980-04-01), Sadamatsu et al.
patent: 4230783 (1980-10-01), Aoki et al.
patent: 4262075 (1981-04-01), Noda et al.
patent: 4310610 (1982-01-01), Sakai
patent: 4311778 (1982-01-01), Kadowaki et al.

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