Photocopying – Contact printing – Light boxes
Patent
1988-03-10
1989-11-07
Braun, Fred L.
Photocopying
Contact printing
Light boxes
355 69, 355 77, 355228, G03G 1504, G03G 2100
Patent
active
048795763
ABSTRACT:
An image forming apparatus of a visible image transfer type provided with a standard pattern which is disposed at a position where it can be illuminated by a lamp for illuminating an original, a first sensor for detecting the density of the original and a second sensor for detecting the density of a visible image of a standard pattern. The light amount of the lamp is varied so as to make the density of the visible image detected by the second sensor fit a fixed value or fall within a fixed range, and is designated as a corrective data. The light amount of the lamp, which corresponds with the original density, is corrected in accordance with the corrective data by shifting a characteristic curve which shows the relation between the density of the original and the light amount of the lamp used for the original density measurement.
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Braun Fred L.
Minolta Camera Kabushiki Kaisha
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