System for measuring marking material on a surface, such as...

Details System for measuring marking material on a surface, such as... System for measuring marking material on a surface, such as...

2011-08-09

2011-08-09

Gray, David M (Department: 2852)

Electrophotography

Control of electrophotography process

Of plural processes

Reexamination Certificate

active

07995940

ABSTRACT:
A printing apparatus has a substantially shiny photoreceptor imaging surface, and a photosensor array disposed to receive specularly-reflected light from the imaging surface. A quantity of toner is placed on the imaging surface, and data is derived based on light reflected from the imaging surface. The reflected light is filtered to a color effectively complementary to the toner color. The system avoids noise caused by diffusely-reflected light from powdered toner.

REFERENCES:
patent: 4967238 (1990-10-01), Bares et al.
patent: 5694223 (1997-12-01), Katori et al.
patent: 5712666 (1998-01-01), Matsubara et al.
patent: 2006/0038873 (2006-02-01), Hirai et al.
patent: 2007/0003302 (2007-01-01), Mizes

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