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Conductive Photo Images

IP.com Disclosure Number: IPCOM000095551D
Original Publication Date: 1964-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Rashleigh, C: AUTHOR

Abstract

A photosensitive emulsion is exposed and processed to yield a non-conductive fine line pattern of silver particles 1A. These are loosely suspended in a gelatinous base material 2A on a supporting substrate 3 of plastic film or other material. This pattern defines the shape of an electrical circuit.

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Conductive Photo Images

A photosensitive emulsion is exposed and processed to yield a non- conductive fine line pattern of silver particles 1A. These are loosely suspended in a gelatinous base material 2A on a supporting substrate 3 of plastic film or other material. This pattern defines the shape of an electrical circuit.

The silver particle suspension is immersed in a solution of sodium hypochloride, i. e., household bleach, for 15 to 20 seconds, or until silver can be seen leaving the substrate, then rinsed in water and allowed to dry. The surface of the partially dissolved suspension is then buffed or peened over. Such is to enhance the conductivity of the still powdery pattern of silver particles 1B which remain adherent to the substrate 3 via the undissolved gelatin 2B.

The thickness and conductivity of the powdery silver 1B is then increased by plating additional metal 1C onto the silver powder.

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