Patent ID: 9437456
Filing Date: 2016-09-06
CPC Classification: F27B,F27D,H01L

Claim Text:
1. A heat treatment method irradiating a substrate with flashes of light from flash lamps to heat the substrate, comprising: (a) a first irradiation step of irradiating said substrate with a flash of light of a first pulse, said first irradiation step being started at a first time; (b) a second irradiation step of irradiating said substrate with a flash of light of a second pulse having a length different from said first pulse, said second irradiation step being started at a second time later than said first time; and (c) Performing said second irradiation step such that at least a part of the irradiation of a flash of light of said second irradiation step is superimposed on the irradiation of a flash of light of said first irradiation step.