Image forming apparatus controlled according to smallest non-zer

Details Image forming apparatus controlled according to smallest non-zer Image forming apparatus controlled according to smallest non-zer

1992-12-16

1993-12-28

Pendegrass, Joan H.

Photocopying

Contact printing

Light boxes

355246, 358500, 358300, G03G 1500, G03G 1501

Patent

active

052744248

ABSTRACT:
In an image forming apparatus with use of electrophotographic process, a plurality of toner images are formed on a photoconductor by changing stepwise a predetermined operating parameter such as light intensity of laser beam or the grid potential of sensitizing charger, and the densities of the toner images are measured. Thus, the value of the operating parameter is determined which corresponds with the smallest non-zero toner density among the measured densities. When an image is formed on the photoconductor, for example the gamma table is corrected according to the determined minimum light intensity.

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