Patent ID: 6137633
Filing Date: 2000-10-24
Classification: B23K,G02B

Abstract:
A laser irradiating apparatus comprising:a first cylindrical lens group including a plurality of constituent lenses each having a width W for dividing a laser beam into N(n-1) sections along a width direction of the laser beam;a parallelogram second cylindrical lens group having an angle X defined by .vertline.tan X.vertline.=W/(d/(n-1)) for dividing the laser beam into (2n+1) sections along a longitudinal direction of the laser beam;a parallelogram first cylindrical lens having the angle X defined by .vertline.tan X.vertline.=W/(d/(n-1)) for re-coupling the laser beam divided along the longitudinal direction; anda second cylindrical lens group for re-coupling the laser beam divided along the width direction;wherein said d is defined as an interval of peaks of interference stripes formed on a plane on which the laser beam is irradiated which passes through one constituent lens of the first cylindrical lens group that divides the laser beam in said width direction, andwherein said N is a natural number, said n is a natural number of 3 or more, said angle X is not a right angle, and said width W has the same unit as said d.