X-Ray Cathode Focusing Element With Rounded Features for HV Stability
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Solution Overview
Problem
Conventional methods for manufacturing smart cathodes in X-ray imaging systems face challenges such as reduced high-voltage stability, shorter lifetime due to electron and voltage leaks, and limited focusing feature geometries, primarily caused by angled geometries and incomplete cleaning of surfaces.
Innovation Solution
A method involving machining focusing features with rounded edges and smooth geometries on a separate focusing element, followed by electro-polishing and welding to a base assembly with specific edge weld features and curved gaps to enhance high-voltage stability and focusing range, while ensuring thorough cleaning of the cathode surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional manufacturing methods are used for smart cathodes, then production is simpler and faster, but high-voltage stability is reduced and lifetime is shortened due to electron and voltage leaks
Solution Approach 1:
The patent applies preliminary action by performing electro-polishing on the focusing element before welding it to the base assembly. This pre-treatment removes surface contaminants and creates a cleaner surface that prevents electron and voltage leaks during operation, thereby improving high-voltage stability and extending cathode lifetime before the actual assembly is completed
Solution Approach 2:
The patent applies local quality by implementing curved gaps at specific locations (corners) of the base assembly rather than uniform welding throughout. These localized curved gaps at the corners prevent stress concentration and reduce electron leaks at critical areas, improving overall high-voltage stability while maintaining manufacturing feasibility
2Duration of action of stationary object
If conventional welding is performed around the entire perimeter, then assembly is simpler, but stress concentration occurs at corners reducing cathode lifetime
Solution Approach 1:
The patent applies segmentation by dividing the continuous welding perimeter into separate segments with curved gaps at the corners. Instead of welding continuously around the entire perimeter, the welding is segmented to exclude the corner regions, creating distinct weld sections that avoid stress concentration points and extend cathode operational life
Solution Approach 2:
The patent applies asymmetry by introducing curved gaps at specific corner locations rather than maintaining symmetric continuous welding around the perimeter. This asymmetric modification targets the specific stress concentration zones at corners, reducing electron leaks and improving cathode lifetime while adding minimal complexity to the welding process
3Reliability
If angled geometries are used for focusing features, then machining is easier, but focusing capability is limited and high-voltage stability is reduced
Solution Approach 1:
The patent applies spheroidality (curvature) by specifying that focusing features be machined with rounded edges and curved geometries rather than sharp angles. This curvature improves electron focusing capability and reduces electric field distortion that causes high-voltage leaks, while the electro-polishing process enables achievement of these curved geometries with appropriate surface finish
4Reliability
If surfaces are not thoroughly cleaned, then manufacturing process is shorter, but electron and voltage leaks occur reducing cathode performance
Solution Approach 1:
The patent applies preliminary action by performing electro-polishing as a pre-treatment step on the focusing element before assembly and welding. This preliminary cleaning action removes surface contaminants, oxides, and irregularities that would cause electron and voltage leaks, ensuring improved cathode performance while the integrated electro-polishing process maintains reasonable manufacturing cycle time
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
The approach results in increased high-voltage stability, extended cathode lifetime, and improved focusing capabilities, allowing for a wider range of focusing field sizes and shapes, thereby enhancing the reliability and emission performance of the cathode.
Implementation Method 1
The electrons originate from a filament of a cathode assembly with current flowing therethrough. The filament may be heated by the current flowing through it to liberate electrons from the cathode and accelerate the electrons toward the anode. Additional filaments heated by currents at different voltages may be used to focus the electron beam towards the anode
Implementation Method 2
The focusing element is welded to the base assembly at weld features along a first edge, a second edge, a third edge, and a fourth edge of the base assembly
Data Source
AI summary
Various methods and systems are provided for a cathode of an X-ray imaging system. A method for fabricating the cathode comprises machining a plurality of focusing features on a focusing element and welding the focusing element to a base assembly.