PROBLEM TO BE SOLVED: To provide an X-ray photographing apparatus in which the flexibility of a subject irradiation X-ray passing area is increased.SOLUTION: At a position where a part of X-rays capable of passing through a large irradiation field X-ray passing hole C1 can be shielded by a peripheral shielding area P3 under a small irradiation field X-ray passing hole C3 of a vertical direction displacement X-ray shielding plate XK2, the z direction of the vertical direction displacement X-ray shielding plate XK2 is position-set. In the state, the large irradiation field X-ray passing hole C1 of a horizontal direction deviation X-ray shielding plate XK1 and the small irradiation field X-ray passing hole C3 of the vertical direction displacement X-ray shielding plate XK2 do not overlap with each other at all on a zy plane. Thus, of the large irradiation field X-ray passing hole C1 of the horizontal direction deviation X-ray shielding plate XK1, only an area not shielded by the peripheral shielding area P3 of the vertical direction displacement X-ray shielding plate XK2 becomes a subject irradiation X-ray passing area.COPYRIGHT: (C)2013,JPO&INPIT【課題】被写体照射X線通過領域の自由度を大きくしたX線撮影装置を得る。【解決手段】垂直方向変位X線遮蔽板XK2の小照射野X線通過孔C3下の周辺遮蔽領域P3によって大照射野X線通過孔C1を通過可能なX線の一部を遮蔽可能な位置に垂直方向変位X線遮蔽板XK2のz方向を位置設定する。この状態において、水平方向偏位X線遮蔽板XK1の大照射視野X線通過孔C1と垂直方向変位X線遮蔽板XK2の小照射野X線通過孔C3とはzy平面上において全く重なり合わない。したがって、水平方向偏位X線遮蔽板XK1の大照射野X線通過孔C1のうち、垂直方向変位X線遮蔽板XK2の周辺遮蔽領域P3により遮蔽されなかった領域のみが被写体照射X線通過領域となる。【選択図】図7
