Patent ID: 8835800

Claim:
A laser irradiation apparatus comprising: a first laser oscillator configured to emit a first laser beam; a second laser oscillator configured to emit a second laser beam; a first optical system configured to shape the first laser beam into a first linear beam on a surface of an irradiation body; a second optical system configured to shape the second laser beam into a second linear beam on the surface of the irradiation body; means for moving the irradiation body in a direction along a short side of the first linear beam; first supports provided at sides of the means for moving the irradiation body; a second support and a third support extending between the first supports over the means for moving the irradiation body; means for moving the first laser oscillator and the second laser oscillator independently from each other in a direction along a long side of the first linear beam over the second support and the third support; and means for detecting at least one alignment marker, wherein the means for detecting at least one alignment marker comprises a light source with a wavelength range of 200 to 500 nm, and wherein the first laser oscillator and the second laser oscillator are provided so that outputted beams are parallel and in opposite directions to each other and an output portion of the first laser oscillator and an output portion of the second laser oscillator do not face each other.