Patent ID: 7651264
Filing Date: 2010-01-26
Classification: B23K,B29C,G01J

Abstract:
1. A laser processing apparatus for welding stacked resin members to each other by using laser light, the apparatus comprising: a semiconductor laser for generating laser light; and a filter, disposed between the semiconductor laser and the resin members, for blocking light having a wavelength that is other than an oscillation wavelength of the semiconductor laser wherein said blocked light becomes an observation wavelength for measuring a temperature of a welding area in the light generated by the semiconductor laser; one of the stacked resin members, on the incident side of the laser light generated by the semiconductor laser, having a property of transmitting the laser light that is generated by the semiconductor laser and the thermally radiating light that is generated by the welding area; the filter blocks the light that is generated by the semiconductor laser and that has a wavelength other than an oscillation wavelength of the semiconductor laser, and said light having a wavelength falling within the range of 1500 nm to 2800 nm which can be transmitted through the resin member on the incident side of the laser light; wherein the light that is generated by the semiconductor laser and has a wavelength that cannot be blocked by the filter is used for welding the resin members to each other, and said thermally radiating light that is generated by the welding area and has a wavelength that does not pass through said filter, said thermally radiating light is used for measuring the temperature of the welding area.