X-ray Tube Cathode Assembly Focusing Tabs
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Solution Overview
Problem
Existing x-ray tube cathode assemblies often impair the effectiveness of focal spot definition and maintenance, leading to suboptimal focusing of the electron stream and consequently lower quality x-ray images.
Innovation Solution
A cathode assembly with a cathode head, one or more filaments, and focusing tabs abutted against tab stops, allowing for precise positioning of the focusing tabs relative to the filaments to maximize the focusing of the electron stream on the anode surface, producing a tightly collimated x-ray beam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional cathode assemblies are used, then the structure is simple and easy to manufacture, but the focal spot definition and electron stream focusing are impaired
Solution Approach 1:
The cathode assembly is divided into distinct functional components: the cathode head, multiple filaments, focusing tabs, and tab stops. Each component serves a specific purpose in electron emission and focusing, allowing for precise focal spot definition while maintaining manufacturing feasibility through modular assembly.
Solution Approach 2:
The focusing tabs are pre-positioned using tab stops that define their locations relative to the filaments before operation. This preliminary positioning ensures accurate electron stream focusing and focal spot definition without requiring complex adjustment mechanisms during operation.
2Manufacturing precision
If focusing tabs are not precisely positioned, then the cathode assembly structure is simpler, but the electron stream focusing and x-ray beam collimation are suboptimal
Solution Approach 1:
The tab stops are incorporated into the cathode head structure to pre-establish the correct positions for the focusing tabs relative to the filaments. This preliminary positioning arrangement ensures that during assembly, the tabs automatically assume their correct positions, achieving precise electron stream focusing without complex adjustment procedures.
3Manufacturing precision
If the focal spot is not tightly focused, then the cathode assembly is easier to manufacture, but the x-ray image quality deteriorates
Solution Approach 1:
The cathode assembly employs multiple filaments with associated focusing tabs and tab stops to create precise local focusing zones. Each filament-tab-stop combination is optimized to produce a tightly focused focal spot, ensuring high x-ray image quality through improved electron stream concentration at the anode surface.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables the production of better quality x-ray images by ensuring precise focusing of the electron stream, enhancing the collimation and quality of the x-ray beam.
Implementation Method 1
the cathode may be charged with a current that causes electrons to 'boil' off the electron source by the process of thermionic emission
Implementation Method 2
An electric potential can be applied between the cathode and the anode in order to accelerate electrons emitted by the electron source toward the focal track of the anode
Implementation Method 3
X-rays are generated when the highly accelerated electrons strike the focal track
Data Source
AI summary
A cathode assembly for an x-ray tube. In one example embodiment, a cathode assembly includes a cathode head, a filament, and first and second focusing tabs. The cathode head defines a recess having first and second open ends, a slot within the recess, and first and second tab stops within the recess. The filament is positioned within the slot. The first focusing tab is positioned in the first open end of the recess abutting the first tab stop. The second focusing tab is positioned in the second open end of the recess abutting the second tab stop.