Photocopying – Contact printing – Light boxes
Patent
1989-08-25
1992-01-21
Pendegrass, Joan H.
Photocopying
Contact printing
Light boxes
355203, 355246, 356445, G03G 2100
Patent
active
050831615
ABSTRACT:
An infrared densitometer which measures the reflectivity of a selected region on a moving photoconductive belt covered at least partially with marking particles. Collimated light rays are projected onto the selected region of the moving photoconductive member with or without marking particles thereon. The light rays reflected from the selected region of the moving photoconductive member are collected and directed onto a photodiode array. A photodiode array generates electrical signals proportional to the diffuse component of the total reflectivity of the selected region of the photoconductive member with and without marking particles thereon. Circuitry determines a control signal as a function of the difference in electrical signals.
REFERENCES:
patent: 4553033 (1985-11-01), Hubble, III et al.
patent: 4693592 (1987-09-01), Kurpan
patent: 4750838 (1988-06-01), De Wolf et al.
patent: 4796065 (1989-01-01), Kanbayashi
patent: 4799082 (1989-01-01), Suzuki
patent: 4801980 (1989-01-01), Arai et al.
patent: 4989985 (1991-02-01), Hubble, III et al.
patent: 5053822 (1991-10-01), Butler
Borton Michael D.
Hubble, III Fred F.
Martin James P.
Mattioli Theresa K.
Shoemaker Ralph A.
Beck J. E.
Fleischer H.
Horgan Christopher
Pendegrass Joan H.
Xerox Corporation
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