Wireless chip resistor, using thin alloy film on polyimide foil - esp. for use in automatic machines fixing the resistors on printed circuit boards

摘要

A polyimide substrate foil is coated with an NiCr resistor film which may be calibrated to obtain a desired resistance value. The resistor film is provided with thicker contact zones; and both the film and the zones are covered with an adhesive which bonds a covering polyimide foil contg. holes for solderable electric contacts. The chip resistor is pref. made by evaporating an NiCrCu film onto a substrate foil strip, then thickening the Cu film electrolytically in local contact zones. Photo-etching is then used to shape the resistor film and contacts; and a laser is used to adjust the resistance value. A very simple design permitting easy mass prodn. and possessing high mechanical stability.