Method for manufacturing resin mold assembly

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;
• and
• applying a plurality of laser beams through the light transmitting resin member on the second weld region of the light absorbing resin member, wherein the second weld region is divided into a plurality of sections and each of the plurality of laser beams is assigned to a respective one of the plurality of sections, and scanning the laser beams in their respectively assigned sections, over a whole area of the second weld region, to repetitively radiate the laser beams on the second weld region so as to heat 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.

A method for manufacturing a resin mold assembly, the resin mold assembly comprising a light absorbing resin part having a first weld region having a loop shape, and a light transmitting resin part having a second weld region corresponding to said first weld region, the method comprising:

• disposing the light transmitting resin part on the light absorbing resin part such that the first weld region faces and receives the second weld region;
• applying pressure between the light transmitting resin part and the light absorbing part to bring the first weld region and the second weld region into pressed contact in a mutually facing direction;
• setting a plurality of weld lines along a width direction of the first weld region having the loop shape;
• 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 part disposed on the first weld region, and scanning the laser beam along the plurality of weld lines repetitively so as to scan an entire area of the first weld region and establish a temperature gradient in the width direction of the first weld region, so as to heat and melt an entirety of the first weld region and the second weld region simultaneously, thereby welding the light transmitting resin part and the light absorbing resin part.