Photoprinting process and apparatus for exposing paste-consisten

Details Photoprinting process and apparatus for exposing paste-consisten Photoprinting process and apparatus for exposing paste-consisten

1980-05-08

1987-06-02

Hayes, Monroe H.

Photocopying

Contact printing

With scanning

355 85, 355100, 355132, G03B 2710

Patent

active

046698698

ABSTRACT:
Paste-consistency photopolymer is imaged onto printed wiring boards by coating the board overall and positioning the photographic film over the board in register and off-contact. A resilient blade is pressed against the phototool at one end of the board and drawn across the surface, thus forcing the photographic film into intimate contact with the photopolymer and purging all air therebetween. Mounted on the resilient blade aft of leading edge is a shuttered tubular lamp which hardens the photopolymer where the photographic film is clear, so that in a single pass the photographic film is sequentially mated and photopolymer exposed, to produce line widths unmatched by competing dry film systems and at speeds of 0.5 feet per second.

REFERENCES:
patent: 3837887 (1974-09-01), Akamatsu et al.
patent: 4056423 (1977-11-01), Hughes
patent: 4087182 (1978-05-01), Aiba et al.

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