Exposure registry apparatus

Details Exposure registry apparatus Exposure registry apparatus

1976-05-03

1977-06-28

Moses, Richard L.

Photocopying

Contact printing

Fluid pressure retention of carrier and receiver in exposure...

G03B 2720

Patent

active

040322335

ABSTRACT:
The apparatus described facilitates the registry of image bearing transparencies with a plate having a photosensitive coating thereon. After exposure to light, the plate typically is subjected to chemical milling processes to produce printed circuit boards and the like. The registry apparatus includes upper and lower frames which form an enclosed region therebetween in which the plates and transparencies are placed in sandwich relationship. An outer gasket between the frames permits a vacuum to be applied to the enclosed region. An inner perimeter channel is formed in the opposed faces of each frame to permit a separate vacuum to hold the transparencies in place while the frames are opened to remove, insert or replace a plate. Successive plates may be processed without the necessity of re-registering the transparencies prior to each exposure.

REFERENCES:
patent: 3479121 (1969-11-01), Burgess
patent: 3695760 (1972-10-01), Orr
patent: 3927943 (1975-12-01), Pohl et al.

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