Cathode electron gun used for microfocus X ray tube

Abstract

The invention discloses a cathode electron gun used for a microfocus X ray gun. The cathode electron gun comprises a glass core column, ceramic electrodes, a lamp filament cover, a cathode cover, an electrode fixing seat and a lamp filament, two of eight electrodes of the glass core column are connected with one ends of the ceramic electrodes, six of the eight electrodes of the glass core column are connected with the lamp filament cover, the ceramic electrodes are fixed on the electrode fixing seat, the other ends of the ceramic electrodes are connected with the lamp filament, and the electrode fixing seat is fixed in the lamp filament cover which is arranged in the cathode cover. Under the action of a high-voltage electric field of 100KV, a gathering focus, of hot electron flow, at 15mm stroke can reach 30 micrometers, and an X ray gun with a focus to be 30 micrometers and voltage to be 100KV is enabled to be possible.

Description

technical field [0001] The invention relates to the technical field of electron guns, in particular to a cathode electron gun for micro-focus X-ray tubes. Background technique [0002] At present, the X-ray tubes produced in China are large-focus X-ray tubes, and their minimum focus can be 0.3mm×0.3mm; they are widely used in medical and health care, high-power process flaw detection, security inspection and other fields. With the continuous development of the field of science and technology, surface mount (ie SMT) technology has emerged. The use of SMT technology can reduce the volume of electronic products by 40-60% and reduce the weight by 60-80%. But what follows is the traditional detection methods, such as ordinary focus X-ray machines, etc. can no longer meet the quality and reliability requirements of existing production products, especially for the internal defects of components cannot be identified. In this way, a new detection method has appeared, the micro-focu...

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Problems solved by technology

But what followed was the traditional detection methods, such as ordinary focus X-ray machines, etc. can no longer meet the quality and reliability requirements of existing production products, especially for internal defects of components cannot be identified

In this way, a new detection method has appeared, the micro-focus X-ray machine. The core device of this equipment is a micro-focus X-ray tube. If you want to make an X-ray tube with a small focus, you must have an extremely fine electron flow. At present, there is no X-ray tube with a focus of less than 300 μm in China.

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