Patent ID: 7341642

Claim:
A method of manufacturing an electric device including a bonding step wherein a semiconductor chip and a substrate are aligned so that a connection terminal on the semiconductor chip and a connection terminal on the substrate face each other, the semiconductor chip is placed onto an adhesive applied on the substrate, and heat is applied while pressing the semiconductor chip so as to connect the opposing connection terminals to each other, and a temperature of the adhesive showing the lowest viscosity is higher than a reaction start temperature, the bonding step including the steps of: a preheating step of preheating the adhesive to a first temperature no less than the reaction start temperature of the adhesive and below a reaction peak temperature of the adhesive to reduce the viscosity of the adhesive; a temporary bonding step applying pressure to press the semiconductor chip onto the adhesive while maintaining the adhesive at the first temperature, wherein the pressing of the semiconductor chip onto the adhesive does not cause the connection terminal on the semiconductor chip to contact the connection terminal on the substrate; and a permanent bonding step of applying pressure to the semiconductor chip in order to make the connection terminal on the semiconductor chip contact the connection terminal on the substrate, and heating the adhesive to a second temperature higher than the first temperature in order to cure the adhesive.