Color image formation apparatus with density measurement

Details Color image formation apparatus with density measurement Color image formation apparatus with density measurement

1993-03-12

1994-06-28

Pendegrass, Joan H.

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355326R, 356445, G03G 1500

Patent

active

053251539

ABSTRACT:
An image formation apparatus for forming a color image, having an image combining member for overlapping a plurality of different mono-color images formed by an electrophotographic process with a plurality of respective different colorants to form the color image thereon and a density measuring unit for measuring a reflective density at a desired portion of the color image, the density measuring unit having light emitting portion, such as a light emitting diodes, for emitting light toward the image combining member and a photoelectric conversion element, such as a phototransistor, for receiving and photoelectrically-converting the light reflected at the image combining member to a density signal, the plurality of colorants being divided into first and second groups, the first group of the plurality of different colorants having a higher reflectivity than the image combining member with respect to the light, a second group of the plurality of different colorants having a lower reflectivity than the image combining member comprises: a switching circuit for causing the light emitting portion to change an intensity of the light in response to an intensity control signal.

REFERENCES:
patent: 4111151 (1978-09-01), Ruckdeschel
patent: 5103260 (1992-04-01), Tompkins et al.
patent: 5173750 (1992-12-01), Laukaitis
patent: 5200783 (1993-04-01), Maeda et al.

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