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Producing Printed Circuits

IP.com Disclosure Number: IPCOM000095521D
Original Publication Date: 1964-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Cresswell, DJ: AUTHOR

Abstract

The production of an information containing printed circuit is in steps. Initially, a photographic plate is exposed and then developed to produce an opaque plate. Repeated patterns are then mechanically scribed through the developed emulsion.

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Producing Printed Circuits

The production of an information containing printed circuit is in steps. Initially, a photographic plate is exposed and then developed to produce an opaque plate. Repeated patterns are then mechanically scribed through the developed emulsion.

Drawing 1 shows a fragment of the scribed plate. A transparency then has the patterns as shown in drawings 2 and 5 selectively marked on it at a multiplicity of locations.

The locations are disposed so that when the transparency is placed over the photographic plate, the patterns register as in drawings 3 and 6. The doublet consisting of the transparency superimposed on the photographic plate is then used as a negative. A printed circuit is produced from it by known techniques. The circuits are shown in drawings 4 and 7.

The photographic plate can be used repeatedly and is scribed with high accuracy. The transparency does not need to be produced with such accuracy and can be produced by a programmed printer. The photographic plate bears more information than is printed at any one time. Parts of that information are masked out by the transparency.

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