Electrophotographic copier

Details Electrophotographic copier Electrophotographic copier

1976-04-09

1977-12-20

Shoop, William M.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

G03G 2100

Patent

active

040638111

ABSTRACT:
An improved electrophotographic copier is disclosed. The copier includes a rotatable photosensitive member, a first charging means for charging the photosensitive member uniformly with a specific polarity of charges to a predetermined surface potential, an image exposing means for exposing the uniformly charged photosensitive member, an image transfer means for transferring an image onto a copying material and an erasing means for erasing charges on the photosensitive member after transfer by the image transfer means, the improvement which comprises that said photosensitive member is of material which exhibits a hysteresis effect in which the photosensitivity of the photosensitive member when exposed by said image exposing means varies in accordance with the variance of the surface potential at the start of light decay by said erasing means, and a second charging means is provided at a position preceding said erasing means for uniformly applying charges of a polarity the same as the polarity of said first charging means to the photosensitive member.

REFERENCES:
patent: 3147679 (1964-09-01), Schaffert
patent: 3494789 (1970-02-01), Makino
patent: 3625683 (1971-12-01), Emerson
patent: 3649262 (1972-03-01), Cade et al.
patent: 3879785 (1975-04-01), Roth et al.
patent: 3884572 (1975-05-01), Bacon et al.
patent: 3918808 (1975-11-01), Narita
patent: 3967891 (1976-07-01), Rippstein

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