Photocopying – Contact printing – Fluid pressure retention of carrier and receiver in exposure...
Patent
1995-10-24
1997-06-24
Grimley, Arthur T.
Photocopying
Contact printing
Fluid pressure retention of carrier and receiver in exposure...
355 92, 355 87, 355 94, G03B 2720
Patent
active
056421842
ABSTRACT:
Apparatus and method for contact printing uses a vacuum contact plate and a screen frame to hold a master film sheet in contact registration with a screen having a region that is substantially porous to the passage of air disposed about a central photosensitive region. The vacuum contact plate receives the screen frame and supports the master film sheet and the screen on an elevated, substantially planar component. Air is evacuated from a hollow cavity within the elevated component to create a pressure differential across the master film sheet to urge the master film sheet in contact with the screen. If the master film sheet is not large enough to cover the entire porous region of the screen, the master film sheet is attached to a carrier sheet of sufficient size. The carrier sheet is then placed on the elevated component to be retained in contact registration with the photosensitive screen.
REFERENCES:
patent: 3644040 (1972-02-01), Beispel
patent: 4607953 (1986-08-01), Farris
patent: 4620787 (1986-11-01), Black et al.
patent: 4967230 (1990-10-01), Meacham
patent: 5017960 (1991-05-01), Tuulse
patent: 5255052 (1993-10-01), Ternes et al.
patent: 5410385 (1995-04-01), Ohlig
Grimley Arthur T.
Kerner Herbert V.
Lessani Tina M.
Smith Albert C.
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