Photocopying – Contact printing – Light boxes
Patent
1988-04-20
1991-01-01
Braun, Fred L.
Photocopying
Contact printing
Light boxes
355 69, 355214, 355228, G03G 2100, G03B 2772
Patent
active
049822322
ABSTRACT:
An exposure control system includes (a) a first detecting unit for detecting the original image density of an original document and producing a first signal variable with the detected original image density, (b) a control unit for regulating the quantity of light with which the image-carrying document is to be irradiated by the exposure lamp, the quantity of light being regulated on the basis of the signal from the first detecting unit, (c) a reference pattern located to be irradiated with light from the exposure lamp, (d) a second detecting unit for detecting the visualized image density of the reference pattern and producing a second signal variable with the detecting visualized image density, (e) a modifying unit for modifying the quantity of the light from the exposure lamp so that the value represented by the second signal falls within a predetermined range, and (f) a correcting unit for correcting the quantity of light controlled by the control unit, so that the controlled quantity of light is corrected by the correcting unit on the basis of the second signal from the second detecting unit and the quantity of light dictated by the second signal.
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Braun Fred L.
Minolta Camera Kabushiki Kaisha
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