Patent ID: 7527760

Claim:
A method for manufacturing a resin mold, the method comprising the steps of: laminating a transmitting resin member capable of transmitting a laser beam as a heat source and an absorbing resin member capable of absorbing the laser beam; irradiating the laser beam on an interface between the transmitting resin member and the absorbing resin member from surface of the transmitting resin member so that a welding spot is formed on the interface and the transmitting resin member and the absorbing resin member are welded, wherein the laser beam is irradiated homogeneously on the interface by a homogenizer so that a center portion of the welding spot and an outer portion of the welding spot are heated homogeneously by the laser beam, the homogenizer is a convexity disposed on the surface of the transmitting resin member, the convexity increases a reaching range of a component of the laser beam to be irradiated on the surface of the transmitting resin member, the component which reaches the center portion of the welding spot, so that the reaching range of the component becomes larger than another reaching range of another component of the laser beam, which reaches the outer portion of the welding spot, and the laser beam is irradiated on a center of the convexity in the step of irradiating so that the laser beam is irradiated on the interface through the transmitting resin member; and scanning the laser beam in a scanning direction so that the transmitting resin member and the absorbing resin member are bonded linearly, wherein the convexity extends in parallel to the scanning direction of the laser beam, and the convexity has a width in a direction perpendicular to the scanning direction, and the laser beam has a beam diameter, which is larger than the width of the convexity.