Isolating member for use in contact printing

Details Isolating member for use in contact printing Isolating member for use in contact printing

1979-06-27

1980-08-19

Wintercorn, Richard A.

Photocopying

Contact printing

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

355 99, 355118, G03B 2720

Patent

active

042181372

ABSTRACT:
Apparatus and method are disclosed for use in contact printing information from a master record carrier onto a replicate material of a type that emits a gas during the contact print exposure (e.g., a diazo film emulsion). Even though the master record carrier and the replicate material are pressed together by a pressure pad (e.g., a rubber diaphragm), it has been discovered that the emitted gas causes the master and replicate devices to separate slightly and that strain forces in the pressure pad are transmitted to the replicate material causing relative movement of the master record carrier and the replicate material during the contact print exposure. To limit such relative movement, a preferred embodiment of the present invention provides an isolating member disposed between the master-replicate sandwich and the pressure pad. The isolating member, because of certain physical characteristics discussed in detail below, prevents strain forces in the pressure pad from being transmitted to the replicate material.

REFERENCES:
patent: 725969 (1903-04-01), Jaray
patent: 759469 (1904-05-01), Rachel
patent: 2718181 (1955-09-01), Gullixson et al.
patent: 3320867 (1967-05-01), Miller
patent: 3409364 (1968-11-01), Moorhusen
patent: 3510217 (1970-05-01), Cirimele et al.
patent: 3547537 (1970-12-01), Betron
patent: 3689154 (1972-09-01), Swain et al.
patent: 4029404 (1977-06-01), Mizukami et al.
patent: 4087181 (1978-05-01), Alexander et al.

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