Patent ID: 8993924
Filing Date: 2015-03-31
Classification: B23K,C03B

Abstract:
1. A target object processing method capable of self-breaking a target object with a laser beam, the target object processing method performed by a target object processing apparatus and comprising: providing the target object processing apparatus comprising a laser beam source generating the laser beam, a cylindrical concave lens receiving the laser beam directly from the laser beam source, and a cylindrical convex lens correcting a divergence angle of the laser beam diverged through the cylindrical concave lens; generating the laser beam from the laser beam source; correcting the divergence angle of the generated laser beam in only one direction by aligning the cylindrical concave lens and the cylindrical convex lens in the same direction and by making the laser beam received directly from the laser beam source pass through the cylindrical concave lens, and then making the laser beam passing through the cylindrical concave lens pass through the cylindrical convex lens; forming a spot inside the target object along a preset cut line by condensing the corrected laser beam to the inside of the target object; and adjusting a distance between the cylindrical concave lens and the cylindrical convex lens to change a width of the spot in a direction perpendicular to the preset cut line, the width being decreased when the distance is decreased, and to change a shape of the spot according to the adjusted distance, wherein correcting the divergence angle of the laser beam causes the spot with the changed width to have an elliptical shape of which a major axis is aligned along the preset cut line such that a stress concentration point is formed at both ends of the spot in the major axis direction and cracks occur from the stress concentration point, and wherein a phase transformation area is formed within the target object around the spot such that the target object is subject to self-breaking along the preset cut line with the phase transformation area as a starting point.