Patent ID: 7645685

Claim:
A method for producing an IC chip that is manufactured by bonding a surface of a chip portion to a reinforcing plate, comprising: forming a wafer on which a plurality of said chip portions are two-dimensionally arranged, and on which a plurality of surrounding portions that surround the chip portions are arranged, the surrounding portions being thinner than the chip portions; forming grooves two-dimensionally in said reinforcing plate; and bonding said wafer and said reinforcing plate together using a method for bonding the wafer having a first adhesion surface and a first back surface and the reinforcing plate having a second adhesion surface and a second back surface by an adhesive, the adhesive being sandwiched between said first adhesion surface and said second adhesion surface, the bonding comprising: applying said adhesive to said second adhesion surface of the reinforcing plate; holding the wafer by applying negative pressure to said first back surface, wherein the wafer is held at said first back surface, and said first adhesion surface faces downward; holding the reinforcing plate by applying negative pressure to said second back surface, wherein the reinforcing plate is held at said second back surface, and said second adhesion surface faces upward; temporarily bonding the wafer and the reinforcing plate by putting said first and second adhesion surfaces into contact with each other, wherein the wafer and the reinforcing plate are held by negative pressure; and bonding the wafer and the reinforcing plate by curing said adhesive, wherein the wafer and the reinforcing plate are temporarily bonded, centers of said wafer and said reinforcing plate being aligned, and a relative angle between said wafer and said reinforcing plate being adjusted such that each chip portion is included in each corresponding section that is partitioned by said grooves; and dicing a combination of said wafer and said reinforcing plate that are bonded into IC chips, said combination being diced along said grooves, wherein the temporarily bonding the wafer and the reinforcing plate comprises: projecting light that passes through the surrounding portions of said wafer and said grooves of said reinforcing plate from a side of said reinforcing plate, the chip portions of the wafer creating shadows by being thicker than the surrounding portions; and adjusting said relative angle while visually recognizing light that is transmitted through the grooves of said reinforcing plate and recognizing the shadows of said chip portions from the side of said reinforcing plate, the light being transmitted and the shadows being generated by projection of light, and the transmitted light includes visible light components.