| 摘要 |
PURPOSE:To make possible the long-period use of a bend mirror and to reduce the cost of maintenance by constructing a laser beam processing device provided with a laser oscillator, bend mirror, condenser optical system, etc. in such a manner that the position of the bend mirror to be irradiated with the laser beam can be changed as desired. CONSTITUTION:The bend mirror 9 is so fixed that the laser beam 2 emitted from the laser oscillator 1 is reflected onto a work 6 from the position in proximity to the peripheral edge part of the mirror 9 within the range for total reflection as far as possible. The metal deposited by evaporation on the surface of the part of the mirror 9 to be irradiated with the beam 2 is stripped and a pinhole 7 is generated to decrease reflectivity when the laser beam machine is used for a long period of time in such a state. The mirror 9 is thereupon rotated around a central axis 8 so that the laser beam 9 is irradiated on the surface where the metal is not stripped. The long-period use of one mirror is thus made possible. |
