| 摘要 |
PURPOSE:To realize the unfirom heating and melting of synthetic resin material and at the same time prevent the uniform swelling-up of melt from developing by a method wherein laser light is made into a parallel beam with the predetermined diameter by means of a plurality of optical lenses and a probe, the tip form of which is of stepped conical, is employed for the forming of an eyelet form. CONSTITUTION:Laser light M incident from an optical fiber 2 is turned into laser light Ma with a divergence angle of beams theta from the incident part of an upper case 1a in order to strike a first optical lens 4a. By passing through the lens 4a, the light Ma is turned into parallel laser light Mb so as to strike a second optical lens 4b in order to be turned into laser light Mc, which has spherical wave surface and concentrates again, resulting in striking a third optical lens 4c and finally emitting in the form of parallel laser light Md. The tip part of a probe 7 is equipped with a stepped part 7a, from the underside of which a cone 7c is protrudingly formed. The size of the stepped part 7a is the one to engage with the tapered surface Wd of a convergent machined hole Wc formed on an upper synthetic resin material Wa. In addition, the laser light Md is guided by a cylindrical member 5 and transmitted by the probe 7 in order to irradiate a lower synthetic resin material. |
