Electrophotographic machine with high density toner concentratio

Details Electrophotographic machine with high density toner concentratio Electrophotographic machine with high density toner concentratio

1982-06-16

1984-08-21

Prescott, A. C.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 3DD, 355 14R, 118653, 118663, 118688, 118691, 430 30, G03G 1500, G03G 1508

Patent

active

044667310

ABSTRACT:
A toner concentration control test cycle in which a developed test area is formed on a photoconductor charged to a dark charge level. The optical reflectivity of the developed test area is sensed and the result used to replenish toner if indicated. During the test cycle, the magnetic brush bias potential is altered to produce development of the test patch in the gray area with the level of dark charge held constant at a predetermined nominal level. An electrostatic probe and associated circuitry are provided to maintain dark charge at the nominal level during the test cycle.

REFERENCES:
patent: 3788739 (1974-01-01), Coriale
patent: 4179213 (1979-12-01), Queener
patent: 4183657 (1980-01-01), Ernst et al.
patent: 4326796 (1982-04-01), Champion et al.
patent: 4348099 (1982-09-01), Fantozzi
patent: 4377338 (1983-03-01), Ernst

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