Importance

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Abstract

A radiation generating apparatus including: a radiation generating unit for emitting radiation through a transmission window; and a movable diaphragm unit including a restricting blade for adjusting a size of a radiation field and a light projecting and collimating device for making simulation display of the radiation field with a visible light field, in which the light projecting and collimating device includes a light source for emitting visible light, and a reflection plate disposed obliquely to a radiation center axis, the reflection plate having a reflection surface for reflecting the visible light and transmitting the radiation; the visible light field is formed of the visible light which is emitted from the light source and is reflected by the reflection plate; and a compensating member having a thickness variation for reducing unevenness of the radiation emitted in the radiation field is disposed on a radiation exit side of the reflection plate.

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First Claim