Patent ID: 8506872

Claim:
A method for manufacturing a resin mold assembly, the method comprising: disposing a light transmitting resin member on a light absorbing resin member in such a manner that a first weld region of the light transmitting resin member faces a second weld region of the light absorbing resin member; applying pressure between the light transmitting resin member and the light absorbing resin member to bring the first weld region of the light transmitting resin member and the second weld region of the light absorbing resin member into pressed contact in a mutually facing direction; providing (i) an optical system which includes a focus adjusting system adapted to adjust a focal distance of an incoming laser beam, and (ii) galvano mirrors which are disposed downstream of the focus adjusting system and which are adapted to two-dimensionally scan the incoming laser beam; and applying a laser beam through the light transmitting resin member disposed on the second weld region of the light absorbing resin member, while adjusting the focal distance of the laser beam relative to the second weld region by the focus adjusting system, and scanning the laser beam two-dimensionally over a whole area of the second weld region by the galvano mirrors, to repetitively radiate the laser beam on the second weld region so as to heat, from an ambient temperature, and melt an entirety of the first weld region and the second weld region simultaneously, thereby welding the light transmitting resin member and the light absorbing resin member.