Optics: measuring and testing – Of light reflection – With diffusion
Patent
1990-12-24
1992-11-10
McGraw, Vincent P.
Optics: measuring and testing
Of light reflection
With diffusion
356445, 355246, 355203, 2503581, 250341, G01N 2147
Patent
active
051628740
ABSTRACT:
An electrophotographic apparatus having a densitometer, which measures material density located on a substrate by detecting and analyzing only a single diffuse electromagnetic energy signal reflected off of the density of material located on the substrate. Specifically, the apparatus must first be compensated for environmental and individual machine differences using a high density of the material. Moreover, once compensated, the apparatus is calibrated to determine the relationship between diffuse signals and material density. This relationship is calculated by sampling a clean substrate and low densities of the material. Once the relationship is determined, densities of material can be calculated given a corresponding diffuse signal. The calibrated and compensated density calculations enable accurate monitoring and adjustment of the electrophotographic apparatus color toner development systems.
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Keesee LaCharles P.
McGraw Vincent P.
Robitaille Denis A.
Xerox Corporation
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