| 摘要 |
PROBLEM TO BE SOLVED: To miniaturize and reduce the weight of a radiation generating apparatus including a radiation generating unit 2 which emits radiation, and a movable diaphragm unit 3 which has an envelope 17, a reflecting plate 19 which reflects visible light thereon and transmits the radiation therethrough, restriction blades 18 which adjust a size of a radiation field by adjusting a size of an opening part 21 for passing the radiation from the radiation generating unit 2, and a light source 20 of the visible light which simulatively shows the radiation field in a form of a visible light field by the visible light reflected on the reflecting plate 19.SOLUTION: A reflecting plate 19 is provided orthogonal to a central line Z formed by connecting a focal point X of radiation and a center Y of an opening part 21 of restriction blades 18, and across an irradiation path of the radiation which irradiates the radiation field. A light source 20 can be moved between a first position at which the light source 20 can simulatively show the radiation field by the visible light field, and a second position which is displaced from the irradiation path of the radiation which irradiates the radiation field. |
