| 摘要 |
PURPOSE:To offer a device for irradiating with a laser beam which can be easily produced, whose production cost can be reduced, and also whose irradiating area is made to a substantially circular shape by making the laser beam incident on a triangular pyramid prism so that the laser beam may be divided into three and synthesizing each laser beam which is bent and outputted toward a central axis direction so that it may be formed to a nearly hexagonal shape on an irradiating plane. CONSTITUTION:The triangular pyramid prism 1 is a disk-like prism, and the light emitting surfaces 2, meet at the center of the disk to form an apex and the incident surface 4 is made plane. The tilt angle of each plane I, II or III forming the light emitting surface 2 with reference to an optical axis O is from 70 deg. to 80 deg.. When the laser beams A, B and C reach the planes (a), (b) and (c) after passing through the triangular pyramid prism 1, the laser beams passing through the respective inclined planes I, II and III respectively become I', II' and III', and the cross sectional plane of the laser beam is formed to a shape like a hexagon, that means, a nearly circular shape. And also, the intensity distribution on the sectional plane S is nearly averaged. |
