Image forming apparatus including improved toner image density d

Details Image forming apparatus including improved toner image density d Image forming apparatus including improved toner image density d

1993-05-19

1996-05-14

Grimley, Arthur T.

Photocopying

Contact printing

Light boxes

355214, 355246, G03G 2100

Patent

active

055172830

ABSTRACT:
An image forming apparatus capable of detecting a toner image density well by shifting a developing bias. In adjusting a fog density or a solid density, the developing bias is shifted by a specified width so as to form an image of a gray density. This enables detection of the fog density and the solid density to be replaced with detection of a density in a gray density region where a reflection type photosensor can detect a density with high sensitivity. Thus, densities in a fog or solid density region where usually an output from the reflection type photosensor is saturated can be detected with high accuracy.

REFERENCES:
patent: 5134438 (1992-07-01), Nakashima
patent: 5151740 (1992-09-01), Fujimoto
patent: 5216469 (1993-06-01), Yamada
patent: 5227842 (1993-07-01), Hayashi et al.
patent: 5245390 (1993-09-01), Ishigaki et al.

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