Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1980-04-07
1982-09-07
Truhe, J. V.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
355 14D, 355 14CH, 355 71, 355 77, G03G 1500
Patent
active
043480993
ABSTRACT:
The present invention is a sample data control system having (a) a charge control loop for eliminating photoreceptor dark discharge variations due to photoreceptor fatigue and aging to maintain a constant dark development potential, (b) an illumination control loop eliminating variations in the lamp irradiance to maintain a constant background potential, (c) a toner dispensing control loop regulating toner flow using a sensor approach directly sensing developed images to eliminate toner mass variations and (d) a bias control loop to maintain optimum density images on the photoreceptor in spite of changing humidity conditions. Two test targets, each having two test patches are selectively exposed in various combinations to provide test data in the photoreceptor image area for suitable sensing and control of the charge, illumination, toner dispensing, and bias control loops.
REFERENCES:
patent: 3788739 (1974-01-01), Coricole
patent: 4215930 (1980-08-01), Miyakawa et al.
patent: 4226525 (1980-10-01), Sakamoto et al.
patent: 4248527 (1981-02-01), Akiyama et al.
"Automatic Dispensing Control"-William Kurrasch, Xerox disclosure, vol. 5, No. 2, 3/80, p. 199.
Chapuran Ronald F.
Moose Richard M.
Truhe J. V.
Xerox Corporation
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