Background accenuating image forming apparatus

Details Background accenuating image forming apparatus Background accenuating image forming apparatus

1989-01-10

1990-12-25

Moses, R. L.

Photocopying

Contact printing

Light boxes

355328, 355243, G03G 1506

Patent

active

049807250

ABSTRACT:
When it is desired to provide a particular region of an image of a document with a background which is different in color from the background of the other region, an image forming apparatus controls the amount of toner supply for implementing the background of the particular region to produce a solid image of density which remains constant at all times in the particular region. The amount of toner fed to a developing unit for producing the solid image is controlled in matching relation to the area of a desired solid image region or a ratio of magnification change.

REFERENCES:
patent: 4721978 (1988-01-01), Herley
patent: 4769675 (1988-09-01), Watanabe
patent: 4771314 (1988-09-01), Parker et al.
patent: 4777510 (1988-10-01), Russel

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