Patent ID: 7438780

Claim:
A manufacturing method for a semiconductor wafer, comprising the steps of: cutting a glass base that is adhered to a first adhesive sheet into a number of base pieces; lowering the adhesiveness of the first adhesive sheet by irradiation with light; making a second adhesive sheet adhere to the surfaces of said base pieces on the side opposite to the surfaces which are made to adhere to said first adhesive sheet; peeling said first adhesive sheet from said base pieces, such that base chips adhered to the first adhesive sheet are removed; removing base chips adhered to the base pieces by blowing of a gas or by washing using a washing liquid; lowering the adhesiveness of the second adhesive sheet by irradiation with light; and peeling said base pieces from said second adhesive sheet and making said base pieces adhere to a semiconductor wafer via an adhesive layer, said semiconductor wafer having a functional element.