Photo/Etch Removal of Excessive Electrical Shorts
Original Publication Date: 1988-Oct-01
Included in the Prior Art Database: 2005-Feb-16
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.