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Photo Printed Film Circuitry

IP.com Disclosure Number: IPCOM000096583D
Original Publication Date: 1963-Aug-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Bate, WM: AUTHOR [+3]

Abstract

An ordinary silver photographic emulsion is used to yield a configured residue which in turn defines the shape of an electrical circuit film deposited upon it.

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Photo Printed Film Circuitry

An ordinary silver photographic emulsion is used to yield a configured residue which in turn defines the shape of an electrical circuit film deposited upon it.

A glass or other substrate 10 is coated.with a silver halide photographic emulsion 12. Emulsion 12 is exposed to light 14 through a transparency 16. This is a positive of the circuit to be prepared, resulting in a latent image 18A of the circuit. This becomes, after development, fixing and washing, a pattern 18B of metallic silver in a binder. The pattern is then baked so as to drive off the binder, leaving a residue 18C which, at this stage, is rather poorly adherent to the substrate 10 and is only poorly conductive.

Finally, additional conductive metal 18D is plated onto the powdery pattern 18C. This is accomplished by simple immersion of the substrate in an electroless plating bath. Here the catalytic action of the residue 18C causes the metal 18D to plate out upon it. Alternatively, the metal 18D can be deposited electrolytically, In each case, the pattern 18C fixes the pattern of the circuit element 18D without other configuring devices.

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