Burnout frame with UV-absorption

Photocopying – Contact printing – Fluid pressure retention of carrier and receiver in exposure...

Patent

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Details

355125, G03B 2720

Patent

active

050578650

ABSTRACT:
A burnout frame for printing of a transparent original film (4) to a collecting film or printing plate (1) and a simultaneous burning out of non-image-carrying areas by means of a light of short wavelength, comprising a transparent printing glass (6,7,15), which is larger than the largest original film considered to be printed and which has a clear, central part (15) of an optical glass and of a type, which absorbs a part of the light within the ultraviolet wavelength range, particularly a bronze glass and designed to send light through the original film (4), and a diffused part (6-7) of a plastic material, located outside said part, the printing glass on its underside having one or two arrays of vacuum grooves (8, 9), designed to hold by suction an original film (4) and possibly also a masking film (5), and the glass part (15) of the printing glass being inserted into the plastic part (6-7), located on the outside, and being joined to it by means of a glue (16), which forms a light barrier between the glass part (15), and the plastic part (6-7), particularly an optical pure epoxy glue.

REFERENCES:
patent: 4171903 (1979-10-01), Robb
patent: 4583850 (1986-04-01), Thiers
patent: 4791459 (1988-12-01), Hoffman
patent: 4835576 (1989-05-01), Komori et al.
patent: 4902899 (1990-02-01), Lin et al.
patent: 4908658 (1990-03-01), Lundahl et al.

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