RADIATION GENERATING TUBE, AND RADIATION GENERATING APPARATUS AND RADIATION IMAGING SYSTEM USING THE SAME

摘要

Provided is a radiation generating tube in which an insulating tube is prevented from being damaged by heat generation of a target or an electron emitting source during drive. Extending portions extending along an outer periphery of an insulating tube are provided to a cathode and an anode, respectively, and the insulating tube is joined to the extending portions to enhance the strength of joint portions. At the same time, the insulating tube can be deformed easily by setting a tube wall thickness of the insulating tube at a central portion in a longitudinal direction to be smaller than a tube wall thickness of an opening end, and thus the concentration of thermal stress on the joint portions caused by an increase in temperature of the cathode and the anode is alleviated.

主权项

1. A radiation generating tube, comprising:
an insulating tube having a pair of openings; a cathode covering one of the pair of openings and including an electron emitting source, the cathode having a peripheral portion joined to an end face of the one of the pair of openings; and an anode covering the other of the pair of openings and including a target, the anode having a peripheral portion joined to an end face of the other of the pair of openings, wherein at least any one of the cathode and the anode includes an extending portion protruding along at least any one of an inner periphery and an outer periphery of the insulating tube, and the extending portion is joined to the one of the inner periphery and the outer periphery of the insulating tube, and wherein the insulating tube has a thinner tube wall region having a thinner tube wall thickness than a tube wall thickness of a region joined to the extending portion.