Patent ID: 7560660
Filing Date: 2009-07-14
Classification: B23K

Abstract:
1. A laser irradiation method comprising: condensing a plurality of first laser lights outputted from a plurality of first laser oscillating apparatuses through a first optical system such that the plurality of first laser lights partially overlap each other; limiting a width of the overlapped first laser lights on an object in a movement direction on the object to be processed by using a first slit; irradiating the object to be processed with the first laser lights having the limited width by moving the object to be processed from an upper side of the object to be processed; condensing a plurality of second laser lights outputted from a plurality of second laser oscillating apparatuses through a second optical system such that the plurality of second laser lights partially overlap each other; limiting a width of the overlapped second laser lights on the object in a movement direction on the object to be processed by using a second slit; and irradiating the object to be processed with the second laser lights having the limited width by moving the object to be processed from a lower side of the object to be processed simultaneously with the first laser lights.