Patent ID: 7113527
Filing Date: 2006-09-26
Classification: B23K,H01L

Abstract:
1. A laser irradiation apparatus comprising: at least first and second laser oscillators; and means for extending a first laser beam emitted from the first oscillator, the first laser beam having an ellipsoid spot shape; means for extending a second laser beam emitted from the second laser oscillator, the second laser beam having an ellipsoid spot shape, wherein the means for extending the first laser beam and the means for extending the second laser beam are provided obliquely to an irradiation surface, wherein one edge of the first laser beam overlaps with one edge of the second laser beam in the longitudinal direction of the first and second laser beams, and a linear laser beam is formed by the overlapped first and second laser beams on the irradiation surface, wherein the following relation is satisfied when an e wherein a, b, x, x′, y, and y′ are positive numbers.