Patent ID: 8686315
Filing Date: 2014-04-01
Classification: B23K,H01L

Abstract:
1. A laser irradiation device comprising: a first laser of continuous oscillation and a second laser of continuous oscillation; and a first convex lens and a second convex lens, wherein said first convex lens is slantly set with respect to a first laser beam emitted from said first laser and disposed in parallel with an irradiation surface over a substrate and said second convex lens is slantly set with respect to a second laser beam emitted from said second laser and disposed in parallel with the irradiation surface, and wherein said irradiation surface is set so that a third laser beam traveled via said first convex lens and a fourth laser beam traveled via said second convex lens are slantly incident with respect to said irradiation surface and said third laser beam and said fourth laser beam are superimposing at least partly on said irradiation surface.