Electrophotographic apparatus

Details Electrophotographic apparatus Electrophotographic apparatus

1985-04-10

1986-12-30

Prescott, A. C.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 3DD, 118624, 118663, 430 30, G03G 1508

Patent

active

046325379

ABSTRACT:
An electrophotographic apparatus is operable selectively in an image-forming mode and a checking mode. In the checking mode, a region of a photosensitive body or drum having a uniform surface potential is developed by a developing unit at a plurality of different developing bias voltages into toner amount detecting regions.

REFERENCES:
patent: 4239374 (1980-12-01), Tatsumi et al.
patent: 4313671 (1982-02-01), Kuru
patent: 4419010 (1983-12-01), Grombone et al.
patent: 4462680 (1984-07-01), Ikeda
patent: 4466731 (1984-08-01), Champion et al.
patent: 4466732 (1984-08-01), Folkins
patent: 4468112 (1984-08-01), Suzuki et al.
patent: 4522481 (1985-06-01), Imai et al.
patent: 4536082 (1985-08-01), Motohashi et al.

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