Electrophotographic image formation apparatus with two bias volt

Details Electrophotographic image formation apparatus with two bias volt Electrophotographic image formation apparatus with two bias volt

1988-05-26

1991-02-19

Braun, Fred L.

Photocopying

Contact printing

Light boxes

355217, 355219, 355271, G03G 500, G03G 1518, G03G 2100

Patent

active

049948555

ABSTRACT:
A photoreceptor for an image formation apparatus has a photosensitive layer of a multi-layer structure each having the characteristic of increasing its electrical resistance at a different rate upon expose to light. An image-carrying beam of reflected light from an original to be copied is made incident on the photoreceptor to form a resistance image. An electrostatic latent image is formed therefrom either on the photoreceptor itself or on a transfer medium placed in contact therewith and a visible toner image is formed by applying toner on such an electrostatic image but the resistance image on the photoreceptor remains undisturbed during such image transfer processes. Thus, a plurality of copies of a single original can be produced without exposing the photoreceptor to reflected light therefrom for each copy to be printed.

REFERENCES:
patent: 3630608 (1971-12-01), Sage
patent: 3784300 (1974-01-01), Hudson et al.
patent: 3918971 (1975-11-01), Zweig
patent: 4142792 (1979-03-01), Satomi et al.
patent: 4408864 (1983-10-01), Hardenbrook
patent: 4465750 (1984-08-01), Ogawa et al.
patent: 4607934 (1986-08-01), Kohyama et al.
patent: 4818651 (1989-04-01), Shirai et al.
patent: 4818652 (1989-04-01), Shirai et al.

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