PROBLEM TO BE SOLVED: To provide a radio generating pipe 1 having an insulating tubular member 6, a package 8 comprising a cathode 2 joined to one opening of the tubular member 6 and an anode 4 joined to the other opening of the tubular member an electron emission source 3 connected to the cathode 2 and a target 5 connected to the anode 4, the tubular member 6 and at least one electrode of the cathode 2 and the anode 4 interposing a conductive junction material 13 between a joint surface at the tubular member side and a joint surface at one electrode side, facing to each other, and the conductive junction material 13 being protrusively joined from between the joint surfaces toward an outer peripheral surface or an inner peripheral surface of the tubular member 6, to suppress an electric field concentration caused by the conductive junction material 13 protruded from between the joint surfaces.SOLUTION: A recess 17 is formed on an outer peripheral surface or an inner peripheral surface of a tubular member 6, adjacent to a joint surface at the tubular member side to keep a tip of conductive conjunction member 13 protruded from between the joint surface at the tubular member side and a joint surface at an electrode side in the recess 17.COPYRIGHT: (C)2014,JPO&INPIT【課題】絶縁性の管状部材6、該管状部材6の開口の一方に接合された陰極2及び前記管状部材の開口の他方に接合された陽極4を備えた外囲器8と、前記陰極2に接続された電子放出源3と、前記陽極4に接続されたターゲット5とを有し、前記管状部材6と、前記陰極2及び陽極4の少なくとも一方の電極とが、相対向する前記管状部材側の接合面と、前記少なくとも一方の電極側の接合面との間に導電性接合材13を挟み込むと共に、前記両接合面の間から前記管状部材6の外周面又は内周面へ前記導電性接合材13がはみ出した状態で接合された放射線発生管1において、接合面の間からはみ出した導電性接合材13による電界集中を抑制できるようにする。【解決手段】前記管状部材側の接合面に隣接して、前記管状部材6の外周面又は内周面に凹部17を形成し、前記両接合面の間からはみ出した前記導電性接合材13の先端を前記凹部17内に留める。【選択図】図1
