PROBLEM TO BE SOLVED: To attain small size and light weight of a radiation generating device including a radiation generating unit 101 that emits radiation, and a movable diaphragm unit that includes a light projection sighting device 12 that simulatively displays a radiation field by means of visible light.SOLUTION: A light projection sighting device 12 comprises a light source 2 for visible light, a light guide plate 3 that is provided in orthogonal direction to a radiation axis 7 and causes visible light from the light source 2 to exit from a front face, and a louver 4 that applies directivity to the visible light exiting from the front face of the light guide plate 3.COPYRIGHT: (C)2014,JPO&INPIT【課題】放射線を放出する放射線発生ユニット101と、放射線照射野を可視光で模擬表示する投光照準装置12を備えた可動絞りユニットとを有する放射線発生装置において、小型軽量化を図れるようにする。【解決手段】投光照準装置12を、可視光の光源2と、放射線軸7に対して直交方向に設けられ、光源2からの可視光を前面から出光させる導光板3と、この導光板3の前面から出光する可視光に指向性を付与するルーバー4とで構成する。【選択図】図1
