X-ray tube

Abstract

According to one embodiment, an X-ray tube includes a vacuum envelope (15), an anode and a cathode structure (31), which are provided opposite to each other in the envelope. The cathode structure includes a cathode (32) and an insulator (33) which supports the cathode and is attached to the vacuum envelope. The insulator includes a basal portion (39) attached to the vacuum envelope, a support portion (40) which supports the cathode at a distal end projecting from the basal portion, and a tubular projection portion (41) which is provided to project from the basal portion and opposite to a periphery of the support portion.

Description

technical field [0001] The present invention relates to X-ray tubes. Background technique [0002] Conventionally, X-ray tubes have been used in various applications such as medical diagnostic equipment. In the X-ray tube, a cathode and an anode are arranged facing each other in a vacuum envelope, and electrons released from the cathode collide with the anode to generate X-rays. In an anode-grounded X-ray tube, the cathode is supported in a vacuum envelope using an insulator such as ceramics. [0003] Furthermore, when an X-ray tube is used, if an electron avalanche occurs against an insulator, a penetration discharge through the insulator occurs, which causes failure of the X-ray tube. [0004] The electron avalanche relative to the insulator refers to: using electric field radiation to release electrons from the cathode, the released electrons follow the electric field to transition to the positive side (high potential side), the transitioned electrons collide with the i...

AI Technical Summary

Problems solved by technology

If the penetration discharge of the insulator occurs, it will cause failure of the X-ray tube such as vacuum leakage.

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