Shutter unit and laser processing device using the same

Abstract

A shutter unit capable of preventing the scattering of a laser beam when the light path of a laser beam is blocked and being downsized, and a laser processing device using it. In the shutter unit (1), a rotation member (57) is rotated on an axial line gamma and an opening (61) is positioned on an optical axis alpha to let a laser beam L pass when the light path of the laser beam L is opened. When the light path of the laser beam L is blocked, the rotation member (57) is rotated and a reflection surface (62) is positioned on the optical axis alpha to reflect the laser beam L. Since the reflected laser beam L is absorbed by a light absorbing member (63), the scattering of the laser beam L when the light path of the laser beam L is blocked can be prevented. In addition, since both the opening (61) and the reflection surface (62) are formed on the rotation member (57) rotating on the axial line gamma almost orthogonal to the optical axis alpha, the shutter unit (1) can be downsized.

Description

Technical field [0001] The invention relates to a shutter unit that selectively opens and closes the optical path of a laser beam and a laser processing device using the shutter unit. Background technique [0002] As such a shutter unit in the prior art, there are an optical shutter described in Patent Document 1, and a shutter mechanism of a laser processing machine described in Patent Document 2. [0003] The optical shutter described in Patent Document 1 is provided with a cylindrical shutter part that rotates about an axis perpendicular to the optical axis of the laser beam on the optical path of the laser beam, and is formed on the side wall of the shutter part along the optical axis of the laser beam Through hole. In this optical shutter, when the optical path of the laser beam is turned on, the through hole is positioned on the optical axis of the laser beam and passes through the laser beam; on the contrary, when the laser beam is turned off, the through hole is removed f...

AI Technical Summary

Problems solved by technology

[0007] However, in the optical shutter described in Patent Document 1, the shutter portion is cylindrical, so the laser beams interrupted by its side walls are scattered, and a part of the scattered laser beams can return to the laser beam under certain conditions. oscillator problem

[0008] Furthermore, in the shutter mechanism described in Patent Document 2, since the through-hole and the reflective mirror are respectively located at opposite positions sandwiching the rotation center of the laser beam shielding plate, it is difficult to realize miniaturization of the shutter mechanism.

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