Patent ID: 8759158

Claim:
An assembly method for a semiconductor device comprising the steps of: positioning and mounting an outer framework on a cooling base; mounting a first solder plate on the cooling base inside the outer framework; mounting a packaging substrate on the first solder plate by positioning with the outer framework; mounting an inner positioning piece on the packaging substrate by positioning with the outer framework; inserting a pipe portion of a chip positioning piece into an opening of the inner positioning piece and positioning the chip positioning piece by making a part of a bottom surface of the pipe portion of the chip positioning piece become in contact with the packaging substrate; inserting a second solder plate and a semiconductor chip laminated in this order into an opening of the chip positioning piece to position the second solder plate and the semiconductor chip; putting a whole assembly into a heating furnace and melting the first solder plate and the second solder plate while making a part of the bottom surface of the pipe portion of the chip positioning piece be in contact with the packaging substrate that is curved due to thermal stress, the whole assembly including the cooling base, the packaging substrate, the first and second solder plates, the semiconductor chip, and an assembly jig that includes the outer framework, the inner positioning piece, and the chip positioning piece; solidifying the first solder plate and the second solder plate which have been melted, to fix the packaging substrate onto the cooling base and fix the semiconductor chip onto the packaging substrate; and extracting the whole assembly from the heating furnace and removing the assembly jig from the cooling base.