| 摘要 |
PURPOSE:To enable visual or automatic focusing by taking out part of the laser output light in the transmission path for laser light between a laser oscillator and an object to be irradiated and part of the light reflected from said object and adjusting a condenser device to attain the max. ratio between both. CONSTITUTION:The laser light from a laser oscillator 1 is transmitted through a transmission line 2 and is condensed by a working lens 4 via a beam splitter 7 and a bend mirror 3. The condensed laser light is irradiated to a work 5. Part of the laser light is taken out by the beam splitter 7 and a laser output (b) is detected by the 1st laser sensor 8. The laser light returning in the path 2 after reflection by the work 5 is taken out to the 2nd laser sensor 9 and the output (a) thereof is detected. The position of the lens 4 is manually moved upward and downward to adjust the focus until a/b calculated by a divider 10 and displayed on a meter 11 attains the max. value. Automatic focusing is possible if a motor 6, a device 12 for identifying the focal position and a servocontrol circuit 13 are provided to the above-mentioned device. |
