Patent ID: 11923165
Assignee: FUJIFILM CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A radiation tube that is used in a radiation source for radiography, the radiation tube comprising:
an electron emitting unit that includes a cathode unit having an emitter electrode which emits electrons and a gate electrode;
an anode unit that has an anode surface facing the cathode unit and collides with the electrons to generate x-ray radiation;
a constant voltage supply unit that supplies a constant driving voltage to the gate electrode; and
a vacuum tube that accommodates the electron emitting unit, the anode unit, and the constant voltage supply unit;
wherein the constant voltage supply unit includes a Zener diode that is connected in parallel to the gate electrode and the cathode unit and a smoothing capacitor that is connected in parallel to the Zener diode.