Photocopying – Contact printing – Light boxes
Patent
1991-05-30
1992-01-21
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355203, 355228, 371 164, 371 291, G03G 2100
Patent
active
050831593
ABSTRACT:
A test procedure is provided for obtaining optimum illumination exposure in a document scanning an exposure system. A document illumination lamp is energized and reflection images from a document platen is transmitted through an optical system onto a linear photosensor array which is positioned in the normal exposure (image) plane. The array outputs, corresponding to individual photodiodes outputs, are amplified and processed under the control of a computer controlled software program to provide a real time display of the illumination characteristics on a display screen. The screen, in one embodiment, displays a colored bar graph which is superimposed against the horizontal line representing an in specification illumination level. The lamp and, or, illuminator, is repositioned while observing the bar graph until an optimum bar graph value is measured below the specification line. Other displays are provided to monitor and adjust performance of an infrared densitometer and to adjust the gain of the individual photodiodes which form the photosensitive array.
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Xerox Pending Appln. No. D/90158, William A. Blitz et al.
Charnitski George A.
Corona Stephen C.
Lehman Richard F.
Urso Charles J.
Brase Sandra L.
Grimley A. T.
Xerox Corporation
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