| 摘要 |
PURPOSE:To optionally adjust the shape of the image forming spot of a focal point by providing a pair of circular columnar face mirrors between a converging mirror and the body to be machined and arranging the center axes thereof orthogonally cubically mutually. CONSTITUTION:A CO2 laser beam 5 is condensed in a spot shape to a focal position 9 via a pair of the plane mirrors 8x, 8y capable of changing the shape in a cylindrical shape and a concave converging mirror 7. on the other hand, the He-Ne laser light 6 of a visible light slightly adjusted in a larger diameter than that of the CO2 laser beam 5 by the beam magnifier composed of an uneven lens is reflected in the same axial direction as the CO2 laser beam 5 by a metal mirror 3, reflected in order by the mirrors 7, 8x, 8y and converged on the focal point 9 in a spot shape. The mirrors 8x, 8y makes no temp. rise by blowing a cold gas 11 by using a gas blowing device 10. |
