X-ray tube

Abstract

According to one embodiment, an X-ray tube includes a cathode including a filament, an anode target, and an envelope. The cathode includes a metal lead wire supporter which is exposed outside the envelope, which is configured a part of the envelope, and to which a lead wire as a power supplier to the filament is attached such that the lead wire passes both inside and outside of the envelope, and a metal filament supporter fixed on the lead wire supporter, being in contact with the lead wire supporter, and supporting the filament.

Description

[0001] This application claims priority from Japanese Patent Application No. 2015-117322 filed on June 10, 2015, the entire contents of which are incorporated herein by reference. technical field [0002] The present invention relates to X-ray tubes. Background technique [0003] In an X-ray tube, in order to manage the X-ray focus size, it is necessary to strictly manage the position of the filament relative to the cathode cup. In the existing structure, the filament is fixed in the cathode cup through an insulator such as steatite or ceramics. [0004] On the other hand, in order to energize the filament from the outside of the X-ray tube, the lead wire is passed through the glass container of the vacuum envelope. One or two of the leads are connected to the filament, but the rest are fixed to the cathode cap which supports the cathode cup. [0005] When the X-ray tube is in operation, the filament is used at a temperature exceeding 2000° C. Therefore, cathode components...

AI Technical Summary

Problems solved by technology

This is because although the gas adsorbed by extremely high-temperature parts such as filaments desorbs in a short time, the desorption speed of parts with hundreds of degrees Celsius is relatively small, and the gas will be released continuously for a long time, making the vacuum degree in the vacuum tube slow down. deterioration

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