Image density control method for electrophotography

Details Image density control method for electrophotography Image density control method for electrophotography

1983-02-07

1985-05-28

Moses, Richard L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 14D, 355 14CH, 355 77, 118691, G03G 1500

Patent

active

045196958

ABSTRACT:
A method of controlling an image density in electrophotography by controlling at least one of various image density parameters in response to values detected from different pattern areas, the image density parameters including an amount of charge deposited on a photoconductive element by a charger, bias voltage for development, toner concentration in a developer, amount of toner supply to a developing unit and image transfer potential. The method forms at least two pattern areas having different potentials on the surface of the photoconductive element by at least one of various means for forming charge patterns which include controlling the energization of the charger, controlling an illumination lamp and projecting an image pattern. In different ranges respectively assigned to the two pattern areas, there is digitized at least one of values associated with an image density which include a surface potential of the pattern area before development, toner density of the pattern area after development, surface potential of the pattern area after development and image density of an area of a transferred image which corresponds to the pattern area. The digitized data of the different patterns are compared with each other.

REFERENCES:
patent: 4313671 (1982-02-01), Kuru
patent: 4318610 (1982-03-01), Grace
patent: 4341461 (1982-07-01), Fantozzi
patent: 4348099 (1982-09-01), Fantozzi
patent: 4372672 (1983-02-01), Pries

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