Developing process and apparatus for electrophotography

Details Developing process and apparatus for electrophotography Developing process and apparatus for electrophotography

1975-10-22

1977-07-12

Griffin, Donald A.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

G03G 1510

Patent

active

040350711

ABSTRACT:
A developing process for electrophotography and an apparatus for carrying out the process in which a developing electrode is arranged in opposing relationship with a photoconductive member having an electrostatic latent image formed thereon such that a potential corresponding to an average potential of the latent image is produced on the electrode by either induction or resistor chain. The potential on the electrode is, however, controlling so as to be maintained, through a constant voltage element such as a varistor, above a given voltage slightly higher than, or equal to, the lowest potential on at least a portion of the member which is assumable in forming any type of latent images on the member so as to reproduce copies of good quality even from a very light or low density image on an original document to be copied. The electrode potential can be further controlled through a varistor, for example, to be prevented from rising above another given voltage considerably higher than the first mentioned voltage so that good quality copies are reproduced even for an original having a colored background or larger proportion of black image regions.

REFERENCES:
patent: 2877133 (1959-03-01), Mayer
patent: 3782818 (1974-01-01), Smith
patent: 3850662 (1974-11-01), Jahn
patent: 3879120 (1975-04-01), Kurokawa et al.

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