Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1986-05-27
1987-09-15
Braun, Fred L.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
355 14R, G03G 2100
Patent
active
046935924
ABSTRACT:
A test patch generator for electrophotographic machines automatically adjusts test patch exposure to predetermined values regardless of operator-initiated changes in exposure settings. A main illumination source exposes an original document. Integrating the main illumination source produces an electrical signal representative of the amount of such exposure. The signal is modified by a factor selected in accordance with the exposure setting, and the modified signal is used to produce a latent image test patch on a photoconductor member, the patch having an exposure value corresponding to the modified signal. Once the patch is toned, a sensor can be used to measure the patch density and any necessary adjustments to the process parameters made.
REFERENCES:
patent: 3755009 (1973-11-01), Collins
patent: 4082445 (1978-04-01), Steiner
patent: 4239372 (1980-12-01), Iwai
patent: 4248527 (1981-02-01), Akiyama et al.
patent: 4277549 (1981-07-01), Tatsumi et al.
patent: 4313671 (1982-02-01), Kuru
patent: 4378153 (1983-03-01), Nishimura et al.
Xerox Disclosure Journal, "IRD Patch Generation", Geir et al, vol. 6, No. 5, Sep./Oct. 1981, p. 247.
Braun Fred L.
Eastman Kodak Company
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