Patent ID: 9607870
Date: 2017-03-28
CPC Classifications: H01L

Claim:
1. A heat treatment apparatus for heating a substrate by irradiating the substrate with a flash of light, comprising: a chamber for receiving a substrate therein; a holder for holding the substrate in said chamber; a plurality of flash lamps for irradiating the substrate held by said holder with a flash of light; a plurality of switching elements provided in a one-to-one correspondence with said flash lamps and each defining the waveform of current flowing through a corresponding one of said flash lamps; and a light emission controller for individually controlling the operations of said switching elements to individually define the light emission patterns of said flash lamps; further comprising a plurality of illuminance sensors for measuring the illuminances of different regions, respectively, of the arrangement of said flash lamps, wherein said light emission controller controls the operations of said switching elements, based on results of measurement with said illuminance sensors.