Patent ID: 6206265
Filing Date: 2001-03-27
Classification: B23K,H05K

Abstract:
A temperature control method for controlling the temperature of a solder bump in a reflow furnace used in mounting a semiconductor element, in which the semiconductor element is mounted on a substrate via solder bumps while moving the substrate into a reflow furnace, and in which the heat conductivity profile of the reflow furnace is set through temperature analysis, the method comprising the steps of:obtaining, via temperature analysis, temperatures in a forward side and in a rearward side of the movement of the solder bumps securing the semiconductor element, wherein the temperature gradient is analyzed and altered from the circumference of the semiconductor element to the center of the semiconductor element;obtaining, from the analyzed results, a thermal conductive coefficient which is one of the difference between the times at which the temperatures of the solder bumps at the forward and rearward sides exceeds the melting temperature of the solder is small, and the difference between the times at which the temperature of the solder bumps at the forward and rearward sides reaches the melting temperature of the solder is small; andcontrolling the temperature of the solder bumps by setting a heat conductivity profile within the reflow furnace based on the obtained thermal conductive coefficient.