Photocopying – Contact printing – With scanning
Patent
1989-11-30
1991-04-09
Wintercorn, Richard A.
Photocopying
Contact printing
With scanning
355 52, G03B 2710
Patent
active
050068881
ABSTRACT:
The copying device for the modification (distortion) of film patterns, which are arranged on a film to be exposed, comprises a light source 2 which is movable over the film and film pattern. A relative movement between the film pattern and the film is effected in a known manner in the axial direction of the movement of the light source in order to carry out the desired elongation or compression. Further, a slit or line diaphragm is provided, preferably in the form of a collecting lens 6, which extends transversely relative to the movement direction of the light source and is movable along with this. According to the invention, the light source 2 is substantially enclosed by a light collecting foil 3 (as is commercially available under the trademark "LISA" of the firm BAYER AG), one edge of the foil extends parallel to the line diaphragm 6 and is adjacent to it. Accordingly, a point light is radiated in spite of excitation by means of a scattered light in the edge axis. Due to the high efficiency, the collecting lens can be sharply stopped down, i.e. a very narrow light slit is usable, so that a great depth of focus is formed and a shadow-draw effect is prevented.
REFERENCES:
patent: 3445165 (1969-05-01), Dubbs
patent: 3560085 (1971-02-01), Silverberg
patent: 4190347 (1980-02-01), Siegmund
patent: 4420249 (1983-12-01), Trump
Lisa-Kunststoffe-Vorabinformation nur fur den internen Gebrauch (Bayer).
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