ELECTRONIC CIRCUIT BOARD AND MANUFACTURE THEREOF

摘要

PROBLEM TO BE SOLVED: To ensure reliable connection of conductors between upper and lower sheets in a multilayer electric circuit board which is produced by stacking insulator sheets on which conductor layers are formed and bonding the upper and lower layers. SOLUTION: An electric circuit board has a plurality of stacked insulator films 11, conductor patterns 15, 13 provided on the insulator films 11, and an adhesive layer 12 for bonding the insulator films 11. An alloy layer 27 is formed at the upper and lower junctions of the conductor pattern 15 in a step of heating and pressing the insulator films.