公开(公告)号：EP2958128A4

公开(公告)日：2016-04-20

申请号：EP13875076

申请日：2013-12-03

申请人： SHIMADZU CORP

发明人： YOSHIZAWA TATSUYA

IPC分类号： H01J35/16 ,  H01J35/14 ,  H01J35/26

CPC分类号： H01J35/16 ,  H01J35/305 ,  H01J2235/168

摘要： In an envelope rotation type X-ray tube apparatus 1, a cathode 5 releases electrons, and the electrons released from the cathode 5 are deflected by deflection coils 6. A target 7 generates X-rays by being bombarded with the electrons deflected by the deflection coils 6. Here, a shield ring 11, while allowing passage through a ring interior of those of the electrons deflected by the deflection coils 6 that head for an area F of the target 7 set beforehand, blocks electrons heading outward of the area F. Consequently, the electrons are inhibited from bombarding on areas of the target 7 outward of the area F and an envelope 2. This can prevent damage to the envelope 2.