Cathode grid assembly of cold cathode X-ray tube for screen printing process and manufacturing method thereof

Abstract

The invention discloses a cathode grid assembly of cold cathode X-ray tube for a screen printing process. The grid assembly comprises a grid pedestal, a cathode pedestal, a ceramic gasket, a cold cathode, a grid mesh, and a grid flange engraved with a groove. The cathode pedestal is fixed on the grid pedestal; and the ceramic gasket is arranged between the two pedestals for insulation. A conductive silver paste and a field emission material are formed on the cathode pedestal in a silk-screen mode to form the cold cathode. The grid flange is fixed on the grid pedestal; and the grid mesh is welded in the groove of the grid flange. In addition, the invention also discloses a method for manufacturing a cathode grid assembly. The cathode pedestal is assembled to the grid pedestal and the grid pedestal and the cathode pedestal are insulated from each other by the ceramic gasket; the conductive silver paste and the field emission material are transferred on the cathode pedestal by using a silk screen method at a room temperature, thereby making a cold cathode; and the grid mesh is welded in the groove of the grid flange and the grid flange and the grid pedestal are fixed by bolts. Therefore, the cathode emission material is prepared by using the silk screen process directly; and the assembling precision is ensured.

Description

technical field [0001] The invention belongs to the field of cold cathode electron sources, and in particular relates to a cold cathode X-ray tube cathode grid assembly applicable to a silk screen printing process and a manufacturing method thereof. Background technique [0002] X-rays are produced by the bombardment of accelerated electrons on the metal surface, and the kinetic energy lost by the electrons is excited in the form of photons. Due to the strong penetrating properties of X-rays, they are widely used in medical, industrial flaw detection, security inspection and other fields. X-rays are usually generated by X-ray tubes. According to the principle of electron generation, X-ray tubes are mainly divided into hot cathode X-ray tubes and cold cathode X-ray tubes. The hot cathode X-ray tube obtains electrons by heating the cathode tungsten wire to thermally emit electrons, while the cold cathode X-ray tube uses the principle of field emission to apply a strong electr...

AI Technical Summary

Problems solved by technology

Therefore, it is not possible to assemble the cathode base first and then use the thick film process to prepare the cathode, but to screen-print the cathode material on the cathode base with a diameter of millimeters, which not only brings great difficulties to fixing and alignment, but is also extremely easy to damage during the assembly process Cathode material, and more importantly, it is impossible to ensure the distance between the cathode and grid through the subsequent surface treatment of the cathode base

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