Method and apparatus for controlling image density in an electro

Details Method and apparatus for controlling image density in an electro Method and apparatus for controlling image density in an electro

1979-04-09

1982-02-02

Moses, Richard L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

118688, 355 3DD, 355 77, G03G 1500

Patent

active

043136710

ABSTRACT:
A method of controlling image density in an electrophotographic copying machine includes operating a first detector to measure the density of a blank region on a photosensitive member, operating a second detector to measure the density of a reference toner image formed on a portion of the blank region, comparing the measured densities of the blank region and the reference toner image, and controlling the density of a developed image of an original in accordance with the results of the comparison. An apparatus in accordance with the invention includes a pair of optical density detecting sensors positioned in opposition to the photosensitive member and in juxtaposition to each other in the direction transverse to the direction of movement of the member.

REFERENCES:
patent: 3876106 (1975-04-01), Powell et al.
patent: 4026643 (1977-05-01), Bergman
patent: 4050806 (1977-09-01), Miyakawa et al.
patent: 4082445 (1978-04-01), Steiner

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