| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To obtain the signals of received luminous quantity that accurately express the strength and the changes of a machining beam. <P>SOLUTION: A laser light, which is led to a head part 2 from a laser light source 10 through an optical fiber 3, is led to a dichroic mirror 22, and the laser light that is reflected with the dichroic mirror 22 is emitted as a machining beam. A photodiode 23 for monitoring the strength of the machining beam and an optical attenuation filter 24 for attenuating the light to be incident on the photodiode 23 are provided on the optical path of the transmitted light from the mirror 22. The designed transmittance of the dichroic mirror 22 is determined under such condition that a difference between the transmittance of a P wave and an S wave, which is caused by an error of the transmitted light quantity, is within tolerance. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
