Patent ID: 7838796

Claim:
A method of cutting a stack structure, comprising: forming a stack structure by stacking at least first and second laser transmitting members and at least one laser absorbing member, each of the first and second laser transmitting members having a plurality of grooves on a surface, the laser absorbing member having two surfaces, each of the surfaces respectively contacting the surface of the first laser transmitting member and the surface of the second laser transmitting member, and covering the plurality of grooves; emitting a laser beam on the surface of the laser absorbing member through the groove of the first laser transmitting member, the laser beam scattering material of the laser absorbing member in the groove; injecting gas at a laser-irradiated spot on the first laser transmitting member; cutting the laser absorbing member by the emitted laser beam and cutting the first laser transmitting member by the scattering material; carrying the scattered material into the groove of the second laser transmitting member by the injected gas through gaps formed by cutting the first laser transmitting member and the laser absorbing member; and cutting the second laser transmitting member by the scattered material in the groove of the second laser transmitting member.