Patent ID: 7396780

Claim:
A method of carrying out the laser processing of a wafer with a laser beam processing machine comprising a chuck table for holding a wafer, a laser beam application means for applying a laser beam to the wafer held on the chuck table and a processing-feed means for processing-feeding the chuck table and the laser beam application means relative to each other, comprising the steps of: a wafer affixing step for putting the wafer on the surface of a protective tape mounted on an annular frame, in which a 5 μm thick acrylic resin adhesive layer is laid on the surface of a 100 μm thick polyolefin-based resin sheet; a wafer holding step for holding the wafer put on the protective tape on the chuck table; and a laser beam application step for applying a laser beam having a wavelength of 355 nm from the laser beam application means to the wafer held on the chuck table and processing-feeding the wafer with the processing-feed means, wherein the protective tape is made of a material which transmits the laser beam having a wavelength of 355 nm applied from the laser beam application means.