| 摘要 |
PURPOSE:To convert a laser beam to an energy distribution being appropriate to a surface treatment, etc. by focusing the laser beam from a laser oscillator by a condensing lens, and thereafter, allowing it to pass through a tubular internal mirror. CONSTITUTION:In a laser beam machine consisting of a laser oscillator (not shown in the figure) and a condensing lens 11, a tubular internal mirror 14 is provided through a lens barrel 13 on the lower part of said focusing lens 11. In such a case, the lens barrel 13 for connecting said focusing lens 11 and the internal mirror 14 is allowed to have a larger inside surface that the inside surface of the internal mirror 14. In such a state, a laser beam L from the laser oscillator is allowed to pass through the condensing lens 11, and an obtained laser beam L' is further allowed to pass through the internal mirror 14 through the lens barrel 13, and brought to multiple reflection thereby. As a result, in an outlet 15 of the internal mirror 14, said laser beam is converted to an energy distribution being appropriate to such surface working as cutting, etc. and allowed to irradiate the surface of an object to be worked 16. In such a case, auxiliary gas G is supplied from a gas supply pipe 12 provided on said lens barrel 13, contamination of the condensing lens 11, etc. is prevented, or it is desirable to use it as shielding gas. |
