Patent ID: 9734980
Date: 2017-08-15
CPC Classifications: H01J

Claim:
1. A high efficiency graphene cathode field emission X-ray tube, comprising a cathode assembly, an anode assembly and a vacuum glass tube; wherein the anode assembly comprises an anode target, a Kovar ring and an anode handle, and the anode target is formed integral with the anode handle; the anode handle is used to introduce a high voltage, a graphene cathode is grounded via a Kovar stem, a high voltage between an anode and a cathode making the graphene cathode emit electrons, a cathode head and a cathode shield riveted into an equipotential body to serve as a gate electrode of the X-ray tube, wherein a voltage ranging from −2000 v to +2000 v applied between the cathode head, the cathode shield and the graphene cathode control the magnitude of electron emission, and the electrons accelerated in a high-voltage electric field generated by the high voltage to bombard the anode target so as to generate X-rays; and a distance D