Photocopying – Miscellaneous
Patent
1976-07-06
1978-09-19
Braun, Fred L.
Photocopying
Miscellaneous
96 362, 354292, 355 77, 355132, G03B 2702, G03B 2732
Patent
active
041150031
ABSTRACT:
A graphic aid and method and system associated therewith are provided for producing aligned patterns in registry such as circuit board patterns and portions thereof. Certain features of the invention make it especially useful in fabricating multiple patterns which are discrete but in registry and in which one pattern represents a portion common with all the rest. Such a system is exemplified by two sided or multilayer circuit boards. The aid includes a diaphanous layout sheet whereon one or more sets of light absorptive pattern elements and reflective marks are arranged to conform to desired circuit patterns for the surfaces of a printed circuit board. A light absorptive background sheet is also provided and it is selectively positioned behind the layout sheet, to produce visible contrast with the reflective pattern marks thereon. In applying the invention to two-sided or multilayer printed circuit boards, the absorptive pattern elements are diaphanous and the absorptive pattern elements for each side or layer have a unique light filtering characteristic. A photographic image taken while frontlighting the aid will show by reflected light the position of the reflective pattern marks relative to the absorptive circuit pattern elements contained on the layout sheet which cannot be seen against the absorptive background sheet. In a similar fashion, backlighting the layout sheet with the background sheet removed and with a filter placed behind the layout sheet corresponding to one and then another set of diaphanous pattern elements, will produce light patterns from which photographic images of the front and back side circuit patterns or individual layers thereof can be produced.
REFERENCES:
patent: 3169063 (1965-02-01), Johnston et al.
patent: 3264105 (1966-08-01), Houtz
patent: 3288607 (1966-11-01), Middleton
patent: 3657983 (1972-04-01), Baker
patent: 3663223 (1972-05-01), Camenzind
patent: 3769895 (1973-11-01), Lucas
Braun Fred L.
Fotel Inc.
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