Photocopying – Including fiber optics
Patent
1980-08-20
1982-08-03
Hayes, Monroe H.
Photocopying
Including fiber optics
362 32, 350 9627, G03B 2700
Patent
active
043425119
ABSTRACT:
An illumination system for a document scanner comprising a fluorescent lamp for illuminating a document to be scanned and an efficient light guide which "pipes" the light to the target document area. The fluorescent lamp has an aperture defined by an aperture angle wherein the lamp radiance is determined by the aperture angle. The light guide has a trapezoidal longitudinal cross section. An input window associated with the narrow base of the trapezoidal shape light guide is coupled to the aperture of the lamp. An output window associated with the wide base of the trapezoidal shape light guide is directed to the document area. The design of the illumination system includes having the magnitudes of the guide angle, the scan distance, the narrow base, the wide base, and the length of the light guide optimized so as to maximize the product of the lamp radiance and the solid angle subtended by the wide base from points inside the document area, whereby the amount of light delivered to the document area is maximized.
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Routt, Jr. Wilson M.
VanHook Danny A.
Hayes Monroe H.
International Business Machines - Corporation
Jancin, Jr. J.
Knearl Homer L.
Yee Yen S.
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