Patent ID: 9387553
Filing Date: 2016-07-12
CPC Classification: B23K,G02B

Claim Text:
1. A laser irradiation apparatus comprising: a cylindrical lens array configured to divide a laser beam into a plurality of laser beams, the cylindrical lens array comprising a first cylindrical lens and a second cylindrical lens in direct contact with the first cylindrical lens; a first combined cylindrical lens array in which first convex cylindrical lenses and first concave cylindrical lenses are arranged alternately in a direction of curvature; and a second combined cylindrical lens array in which second convex cylindrical lenses and second concave cylindrical lenses are arranged alternately in a direction of curvature, wherein the first combined cylindrical lens array and the second combined cylindrical lens array are stacked in a direction of a generating line of the first concave cylindrical lens, wherein the first concave cylindrical lens comprises a concave surface and a flat surface opposite the concave surface, wherein a direction of curvature of the cylindrical lens array is perpendicular to a direction of curvature of each of the first and second combined cylindrical lens arrays, and wherein an outer shape of a beam exit surface of the first cylindrical lens is the same as an outer shape of a beam exit surface of the second cylindrical lens.