Electrostatographic copying apparatus with automatic toner densi

Details Electrostatographic copying apparatus with automatic toner densi Electrostatographic copying apparatus with automatic toner densi

1979-12-14

1981-07-21

Moses, Richard L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

118668, 118679, 118691, 355 3DD, 355 14E, G03G 1500

Patent

active

042794986

ABSTRACT:
A photoconductive drum (32) is charged, radiated with a light image of an original document (34) and developed to produce a toner image. The density of the toner image is sensed and additional toner fed to a developing unit (37) if the sensed density is below a predetermined value. The sensed toner density is compensated for variations in charge potential, light image intensity, electrostatic image potential, developing bias voltage, power supply voltage and/or sensor output so as to be independent of these variables.

REFERENCES:
patent: 3348522 (1967-10-01), Donohue
patent: 3553464 (1971-01-01), Abe
patent: 4082445 (1978-04-01), Steiner
IBM Tech. Disc. Bull., "Toner Concentration Control", G. L. Smith, vol. 19, No. 11, Apr. 1977, p. 4078.

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