Patent ID: 9346130
Filing Date: 2016-05-24
CPC Classification: B23K,B28D,C03B

Claim Text:
1. A method comprising: providing a workpiece including a bulk material and having a top surface and a bottom surface; forming a chamfer within said bottom surface, wherein forming said chamfer includes: providing a laser machining system including a laser operable to emit a laser beam having a wavelength, wherein said laser machining system also includes beam optics operable to focus said laser beam to a focal spot; determining laser parameters for producing said focal spot suitable forming a chamfer within said bottom surface, wherein said bulk material is substantially transparent to said wavelength of said laser beam and has a fluence ablation threshold, wherein said laser beam has a laser beam fluence that is lower than said fluence ablation threshold of said bulk material except at said focal spot, and wherein said laser parameters cooperate with said beam optics to provide a focused fluence at said focal spot that is greater than said fluence ablation threshold of said bulk material; generating said laser beam; directing said laser beam onto said top surface of said workpiece; and moving said laser beam in relation to said workpiece to translate said laser beam across said top surface along a plurality of separate paths to form said chamfer in said bottom surface of said workpiece, wherein said plurality of separate paths includes first and second paths, wherein along said first path said focal spot is focused at said bottom surface such that said focal spot provides said focused fluence sufficient to remove bulk material from said bottom surface to form a kerf in said bottom surface of said workpiece, and wherein along said second path said focal spot is changed to be more deeply within said bulk material with respect to said bottom surface such that said focal spot provides said focused fluence sufficient to remove bulk material to extend said kerf more deeply into said bulk material.