| 摘要 |
PURPOSE:To shield safely and surely a laser beam by providing a mobile reflecting plate on a laser beam control optical path and also an attenuator photodetecting reflected beam thereof. CONSTITUTION:A reflecting plate 20 is moved reciprocally in the direction of an output axis 19 via a cylinder 18. An attenuating room 23 like recessed spherical surface is formed together with an attenuating block 22 for an attenuator 21. In case of shielding a beam 4a, the optical path between the lens 7, 8 is shielded with the movement of the reflecting plate 20 on giving an instruction. In this case the reflected beam 4C is passed through a glass plate 24 and enters into the attenuating room 23 and the diameter of the beam is magnified by a diffusion lens 25. The beam 4a that the density of its laser energy is reduced is therefore absorbed to the inner wall of the attenuating room 23 and attenuated further. With this method the temp. rise of an optical component is reduced and the laser beam is safely and surely shielded. |
