Patent ID: 6949470

Claim:
A method of manufacturing circuit devices, comprising: preparing a substrate by laminating a first conductive film and a second conductive film to cover a principle surface of the first conductive film; covering said second conductive film with a photoresist layer in a desirable pattern and having an inclined surface at opening portions; selectively forming a conductive wiring layer at the opening portions of said photoresist layer and providing an inverted inclined surface around said conductive wiring layer; removing said second conductive film by use of said conductive wiring layer as a mask; fixedly fitting semiconductor elements on said first conductive film and electrically connecting electrodes of said semiconductor elements with predetermined parts of said conductive wiring layer; covering said semiconductor elements with a sealing resin layer and making said sealing resin layer produce an anchoring effect at said inverted inclined surface of said conductive wiring layer; and removing said first conductive film to expose said second conductive film positioned on the rear surface of said sealing resin layer and said conductive wiring layer.