Electrophotography – Control of electrophotography process – Of plural processes
Patent
1994-12-16
1997-12-09
Braun, Fred L.
Electrophotography
Control of electrophotography process
Of plural processes
399 74, G03G 1500, G03G 1508
Patent
active
056970110
ABSTRACT:
An image forming apparatus includes an image bearing member for bearing an electrostatic image, a plurality of developing units for accommodating developers having different colors, a light source for projecting light onto a developed image, and a photosensor for sensing reflected light from the developed image. The apparatus operates in either a first mode for determining the density of the developed image based on the output of the photosensor when light having a predetermined amount is projected from the light source, or in a second mode for determining the density of the developed image based on the amount of light projected from the light source when the output of the photosensor has a predetermined value. Either the first mode or the second mode is selected in accordance with the color of a developer being utilized during the image formation operation.
REFERENCES:
patent: 4952986 (1990-08-01), Maeda et al.
patent: 5107302 (1992-04-01), Bisaiji
patent: 5119132 (1992-06-01), Butler
patent: 5245390 (1993-09-01), Ishigaki et al.
patent: 5353103 (1994-10-01), Okamoto et al.
Kobayashi Tatsuya
Uchiyama Akihiko
Braun Fred L.
Canon Kabushiki Kaisha
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