Patent ID: 9102005
Filing Date: 2015-08-11
Classification: B23K,B28D,H01L

Abstract:
1. A laser processing method including the steps of: securing a wafer-like object to be processed onto an expandable holding member stuck to a frame; holding the wafer-like object and the expandable holding member onto a porous sheet and a porous suction table of a vacuum chuck by suction, the porous sheet being interposed between the porous suction table and the expandable holding member and being in direct contact with the porous suction table on one side of the porous sheet and being in direct contact with the expandable holding member on the other side of the porous sheet; and irradiating the object with laser light while locating a converging point within the object, so as to form a modified region to become a cutting start point within the object along a line to cut in the object after the step of holding; wherein the porous sheet has a Young's modulus lower than that of the suction table and a pore size of the porous sheet is smaller than a pore size of the porous suction table, and wherein the expendable holding member is subjected to vacuum suction towards the porous sheet via pores of the porous suction table and the porous sheet, respectively.