Electrophotographic apparatus having compensation for changes in

Details Electrophotographic apparatus having compensation for changes in Electrophotographic apparatus having compensation for changes in

1977-10-28

1979-01-30

Gellner, Michael L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 69, G03G 1516

Patent

active

041369459

ABSTRACT:
An illumination control system for electrographic apparatus of the type utilizing a reusable photoconductive insulator member that changes in electro-photosensitive properties during the period of its useful life. The system includes a device for sensing and storing usage information about such member, for providing signals representative of cumulative usage of the member and for increasing the exposure of the member in accordance with a non-linear schedule which corresponds to photochemical, sensitometric changes that occur in the member with increasing cumulative usage.

REFERENCES:
patent: 2956487 (1960-10-01), Giaimo, Jr.
patent: 3438704 (1969-04-01), Schoen
patent: 3575505 (1971-04-01), Parmigiani
patent: 3672759 (1972-06-01), Bauer
patent: 3738242 (1973-06-01), Lee et al.
patent: 3788739 (1974-01-01), Coriale
patent: 3892481 (1975-07-01), Schaefer et al.
patent: 3914147 (1975-10-01), Hunt et al.
patent: 3922380 (1975-11-01), Rowell et al.

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