Patent ID: 9662744
Date: 2017-05-30
CPC Classifications: B23K

Claim:
1. A laser irradiation device, comprising: (1) a laser oscillator configured to oscillate a laser beam; (2) a laser irradiation head configured to irradiate the laser beam oscillated with the laser oscillator onto a processing region; and (3) a laser transmitter configured to transmit the laser beam from the laser oscillator to the laser irradiation head, wherein said laser irradiation head comprises: (a) a protective window provided at an irradiation region where the irradiation head is configured to irradiate the laser beam therefrom; (b) a reflection optical element, provided in a path of the laser beam transmitted from the laser transmitter to the protective window, configured to pass through the laser beam and to reflect at least visible light; (c) an image pickup camera configured to capture the visible light reflected with the reflection optical element; (d) an image adjustment optical element, provided between the reflection optical element and the image pickup camera, configured to adjust a focal point of the image pickup camera to at least a first focal position of at the protective window and a second focal position of the processing region; and (e) a wavelength-dependent screen provided between the reflection optical element and the image pickup camera configured to remove a noise component included in the reflected light, wherein the reflection optical element is configured to set its position at 1) a first reflection position configured to reflect the visible light from the laser transmitter to the image pickup camera and 2) a second reflection position configured to reflect the visible light from the protective window to the image pickup camera.