A cold cathode microfocus X-ray tube based on dual electrostatic lenses
By employing a dual electrostatic lens structure in a cold cathode X-ray tube, and utilizing multiple focusing electrodes to form two electrostatic focusing lenses, the limitations of focal size and resolution in existing technologies are solved, achieving the effect of smaller focal size and higher resolution.
CN119153295BActive Publication Date: 2026-01-06UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Patent Information
- Application Number
- CN202411595067.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-11
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2044-11-11
AI Technical Summary
Technical Problem
Existing cold cathode X-ray tubes struggle to achieve smaller focal spot sizes while maintaining emission area, and their complex magnetic lens structures are difficult to miniaturize, resulting in limited resolution and lifespan.
Method used
A cold cathode microfocus X-ray tube based on dual electrostatic lenses is used. By compactly arranging multiple focusing electrodes to form two electrostatic focusing lenses, the trajectory of the electron beam is controlled to achieve a smaller focal size and higher resolution.
Benefits of technology
It significantly improves the resolution and lifespan of X-ray tubes, while reducing the requirements for cathode emission current density and decreasing the precision and manufacturing difficulty of electron gun components.
✦ Generated by Eureka AI based on patent content.
Abstract
The application discloses a cold cathode micro-focus X-ray tube based on double electrostatic lenses, and belongs to the technical field of X-ray tubes.The cold cathode micro-focus X-ray tube comprises a shell, a window, an anode assembly and a cathode electron gun assembly.The anode assembly comprises an anode target.The cathode electron gun assembly comprises a cathode cylinder, a cathode, a grid, a first focusing electrode, a second focusing electrode, a third focusing electrode, an electrode core column, an electrode lead and field emission material in the cathode cylinder.The field emission material generates electrons under the action of field emission, the formed electron beam is converged for the first time under the action of the first electrostatic lens, a first focus is formed, the electron beam is converged for the second time under the action of the second electrostatic lens, a second focus is formed, and finally the anode target is bombarded to generate X-rays.The cold cathode micro-focus X-ray tube improves the converging compression capacity of the electron beam by forming double electrostatic lenses, the size of the converging focus is reduced without affecting the emission area, and the resolution of the X-ray tube is improved.
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