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Photo/Etch Removal of Excessive Electrical Shorts

IP.com Disclosure Number: IPCOM000059436D
Original Publication Date: 1988-Oct-01
Included in the Prior Art Database: 2005-Feb-16

Publishing Venue

IBM

Related People

Authors:
Hawken, DL Lerner, RJ McKeveny, J Moring, AF Pernes, RJ Sissenstein, MJ [+details]

Abstract

One method of producing a printed circuit board is to additively copper plate a photocircuitized image onto a base copper foil, and then selectively etch away the base copper. In this process the board experiences electrical shorts when the base copper is insufficiently etched away, and, as a result, circuit lines touch. Normally, these shorts are of a relatively low level and can be removed by mechanical means, i.e., cutting the shorts out with a sharp instrument, but such an effort is labor intensive. These shorts may also be removed in a photo etch method which removes the short-causing copper but protects the circuits. The method works in the following manner.