| 摘要 |
PURPOSE:To prevent dew condensation on the surface of an inclined plane mirror for changing the direction of laserlight right above a working table under a highly moist condition by separating the cooling stage of said mirror and the other cooling stage and interlocking the feeding and stopping of cooling water to said mirror to the transmission of the laser light. CONSTITUTION:The direction of laser light 2 transmitted from a laser oscillator 1 of a CO2 laser device is changed with aninclined plane mirror 6, and enters a machining head 3, from which the light is condensed by a lens to a work. An external part shielding mirror 5 movable from the point A-A to point A'-A' is provided between the oscillator 1 and the head 3, and the detectors 14, 15 of a mechanism for moving the mirror emit signals when the mirror 5 is at the above-mentioned respective points. A solenoid valve 9 is opened by the signal of the detector 15, then the cooling water flows in the mirror 5 to cool the mirror. A solenoid valve 10 is opened by the signal of the detector 14, then the cooling water flows in the mirror 6 to cool the mirror. The cooling water does not flow to the mirror through which the laser light is not transmitted and therefore the generation of dew condensation on account of the cooling on the mirror surface down to the dew point or below is prevented. |
