Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1980-04-14
1984-10-02
Truhe, J. V.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
355 14R, 355 70, G03G 1500
Patent
active
044744536
ABSTRACT:
The optical density pattern of an original document (26) is sensed during scanning movement for radiating a light image of the document (26) onto a photoconductive belt (27) which is held stationary during the scanning. Operating parameters of the apparatus (21) which are to be controlled after completion of scanning are computed as functions of the sensed pattern. Copy sheets of different sizes are provided, and the copy sheet size is selected to be equal to the sensed width of the document (26). Illumination lamps (37) are selectively energized to discharge non-image portions of the belt (27) between scanning and developing in accordance with the sensed dimensions of the document (26). A developing bias voltage is controlled in accordance with sensed document density and contrast.
REFERENCES:
patent: 3639058 (1972-02-01), Kimura
patent: 3955888 (1976-03-01), Kakiuchi et al.
patent: 4008954 (1977-02-01), Ogawa et al.
patent: 4129373 (1978-12-01), Ogura et al.
patent: 4172659 (1979-10-01), Laska
patent: 4193679 (1980-03-01), Mochizuki et al.
patent: 4200391 (1980-04-01), Sakamoto et al.
patent: 4239374 (1980-12-01), Tatsumi et al.
patent: 4255042 (1981-03-01), Armitage, Jr. et al.
patent: 4256401 (1981-03-01), Fujimura et al.
"Erase Lamp Control", T. T. Underhill; IBM Disclosure, vol. 19, No. 2, Jul. 1976, pp. 393-394.
Hosaka Masao
Yanagawa Nobuyuki
Alexander David G.
Moose Richard M.
Ricoh & Company, Ltd.
Truhe J. V.
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