Photocopying – Projection printing and copying cameras – Illumination systems or details
Patent
1976-11-18
1978-03-21
Griffin, Donald A.
Photocopying
Projection printing and copying cameras
Illumination systems or details
355 11, G03G 1500, G03B 2754
Patent
active
040800679
ABSTRACT:
A copying machine wherein successive strip-shaped portions of an original are imaged onto a moving photosensitive carrier by a system which is mounted in part on a reciprocable carriage and includes one or more incandescent or fluorescent lamps and a mask having an elongated aperture through which light issuing from the lamp or lamps and impinging upon successive strip-shaped portions of the original passes to the photosensitive carrier. The mask can be installed in the path of modulated light between the lamp or lamps and the original or between the original and the carrier. The longer sides of the aperture are flanked by crenellated marginal portions of the mask so that the aperture is subdivided into a plurality of elongated neighboring sections which extend in the direction of movement of the carriage. The lens of the imaging system images the neighboring sections of the aperture onto the carrier in such a way that the images overlap, at least in part. This prevents the development (or reduces the sharpness) of ripples which normally develop on the copy as a result of unequal illumination of successive strip-shaped portions of the original, primarily because the intensity of light varies owing to the fact that the lamp or lamps are in circuit with a source of alternating current.
REFERENCES:
patent: 3981577 (1976-09-01), Tsilibes
AGFA-Gevaert A.G.
Griffin Donald A.
Kontler Peter K.
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