Shutter unit and laser processing device using same

Abstract

A shutter unit capable of preventing the scattering of the laser beam upon closing the optical path of the laser beam and capable of being miniaturized, and a laser processing device employing such a shutter unit. In a shutter unit, when the optical path of the laser beam L is opened, a rotating memberis rotated around an axis line γ, and an openingis positioned on an optical axis α so as to pass the laser beam L therethrough. Meanwhile, when the optical path of the laser beam L is closed, the rotating memberis rotated and a reflective surfaceis positioned on the optical axis α so as to reflect the laser beam L. Here, since the reflected laser beam L is absorbed by an optical absorption member, it is possible to prevent the scattering of the laser beam L when the optical path of the laser beam L is closed. In addition, since the openingand reflective surfaceare both formed on the rotating memberwhich rotates around the axis line γ that is substantially orthogonal to the optical axis α, it is possible to reduce the size of the shutter unit