Flow camera for large document reproductions
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United States of America Patent
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Aug 23, 1994
Grant Date -
N/A
app pub date -
Mar 2, 1993
filing date -
Mar 2, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A flow camera equipped with a microprocessor based control system accepts large original documents in continuous, moving fashion and photographs them through a specifically shaped slotted aperture positioned between the original document and an objective lens. The originals are illuminated during exposure simultaneously from the front and the back, recording congruent images from two-sided material such as engineering drawings on translucent media having positionally related information on both sides. The light from the underneath side, opposite the lens, not only reveals and exposes the image on the second side but it enhances the quality and sharpness of the primary image on the side toward the lens. Avoidance of image loss is accomplished by using in the optical system a single mirror which deflects the optical path substantially less than 90.degree.. Servomotors with encoder feedback are correlated by the microprocessor to the degree of photographic reduction so that the ratio of speed between the original document and the moving strand of film is exactly equal to the reduction ratio to avoid speed induced distortion in the reduced and enhanced film image.
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