Thin film resistor network prodn - using cermet on insulated substrate followed by nickel-chromium and gold

摘要

A coating of photo sensitive, etch resistant, positive varnish which is exposed first to a common negative for both high and low value resistors and for the conductor tracks and contact pads. After developing, all three layers are etched away down to the substrate. Separate exposures are then made for the high value resistors followed by etching down to the cermet and for the low value resistors followed by selective etching away of the gold only. Finally the remaining photoresist is cleaned off.