Copying apparatus

Details Copying apparatus Copying apparatus

1981-07-29

1983-05-17

Hayes, Monroe H.

Photocopying

Projection printing and copying cameras

Illumination systems or details

G03B 2774

Patent

active

043837581

ABSTRACT:
In an image formation apparatus having light source means whose light has a spectrum distribution variable with time, means for detecting the light output of the light source means, a control circuit for controlling the turn-on input of the light source means in accordance with the output generated by said light output detecting means and for maintaining the output of said detecting means constant, and a photosensitive medium on which an original image illuminated by said light source means is projected through an optical system, spectrum distribution correcting means for maintaining a proper relation among the spectrum sensitivity of said light output detecting means, the general spectrum transmission factor of said optical system and the spectrum sensitivity of the photosensitive medium is provided to maintain constant the quantity of light to which said photosensitive medium responds.

REFERENCES:
patent: 3279312 (1966-10-01), Rogers
patent: 3679306 (1972-07-01), Dubois et al.
patent: 3914049 (1975-10-01), Basu et al.
patent: 3926518 (1975-12-01), Berry et al.
patent: 4124294 (1978-11-01), Nakamura
patent: 4124295 (1978-11-01), Gardiner

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