Patent ID: 10111311

Abstract:
An emitter that can be lighted even if a line of any part thereof is broken by ensuring an electric pathway. The X-ray tube device includes an electron emission surface P having an electric pathway; electric heating elements 21, 22 that are connected electrically to both ends of said electron emission surface; and two branched terminals that are branched in the middle of the electric pathway of the electron emission surface P between electric heating elements 21 and 22; second electric heating element, in order from the electric heating element 21 as the supporting element 23 and the supporting element 24; and further comprises: a relay 33A that switches the electric heating element 21 and the supporting element 24 to be in a short-circuit/open condition and a relay 33B switches the electric heating element 22 and the supporting element 23 to be in a short-circuit/open condition. A bypass electric pathway may be formed where the short-circuit condition is switched on and such bypass electric pathway can exist at all locations relative to the electric pathway between the electric heating elements 21 and 22.