Patent ID: 8859443
Filing Date: 2014-10-14
Classification: F27B,H01L

Abstract:
1. A method of heating a substrate by irradiating the substrate with a flash of light n times, where n is an integer not less than two, the method comprising the steps of: performing the i-th flash irradiation, where i is a positive integer not more than (n−1), on a substrate to heat a front surface of said substrate; and thereafter performing the (i+1)th flash irradiation on said substrate to reheat the front surface of said substrate before the temperature of the front surface of said substrate becomes equal to the temperature of a back surface of said substrate, wherein the i-th flash irradiation is performed by discharging electrical charges stored in a capacitor through a flash lamp, and the (i+1)th flash irradiation is performed by discharging electrical charges remaining in said capacitor through said flash lamp, wherein energy consumed during single flash irradiation from said flash lamp is not more than a value obtained by dividing energy stored in said capacitor prior to the initial flash irradiation by (n+1).