X-Ray Tube Getter Layout for Cathode Gas Protection
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Solution Overview
Problem
The existing X-ray tubes suffer from cathode deterioration due to gas adherence, which occurs when gas released from members near the cathode adheres to the cathode before being adsorbed by the getter, located outside the electron gun.
Innovation Solution
The getter is positioned in a region where the electron trajectory from the cathode to the target cannot be seen within a tubular body surrounding the cathode, allowing efficient gas adsorption and preventing re-release of adsorbed gas, while being supported by wires and facing openings in a second tubular body to maintain operation and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the getter is disposed in a space inside the housing and outside the electron gun, then the gas generated in the housing can be adsorbed, but gas released from members near the cathode adheres to the cathode before being adsorbed by the getter
Solution Approach 1:
The patent positions the getter in a specific three-dimensional location within the electron gun structure, utilizing spatial dimensionality to create an optimal gas adsorption zone. The getter is disposed at a position where it can intercept gas molecules before they reach the cathode, while maintaining clearance from the electron beam trajectory. This spatial arrangement resolves the contradiction by creating a protective zone around the cathode without interfering with electron emission.
Solution Approach 2:
The getter acts as an intermediary substance between the gas-releasing members and the cathode. It captures and holds gas molecules that would otherwise adhere to the cathode, preventing direct contact between the harmful gas and the cathode surface. This intermediary function protects the cathode while allowing the getter to be positioned in the limited space within the electron gun.
2Productivity
If the getter is positioned close to the cathode for efficient gas adsorption, then gas can be adsorbed quickly, but the electron beam trajectory may be blocked or electrons may collide with the getter
Solution Approach 1:
The patent applies local quality by creating a specialized zone within the electron gun where the getter is positioned. This local region has specific characteristics: it is close enough to the cathode for efficient gas adsorption, but positioned in a location that is not in the direct path of the electron beam. The getter is typically placed on the side walls or in corners of the electron gun structure, providing localized gas capture without interfering with the central electron trajectory.
Solution Approach 2:
The solution utilizes three-dimensional spatial arrangement to resolve the proximity problem. Instead of placing the getter directly in front of the cathode (which would block electrons), it is positioned in the lateral or radial dimensions, adjacent to but not obstructing the electron beam path. This dimensional placement allows the getter to be close to the cathode for rapid gas adsorption while maintaining clear electron beam trajectory.
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 effectively suppresses cathode deterioration by efficiently adsorbing and retaining gas, stabilizing the electric field, and ensuring proper cathode function, thereby enhancing the X-ray tube's performance.
Implementation Method 1
a getter disposed in a region where a trajectory of the electrons from the cathode to the target is not allowed to be seen in an inner region of the first tubular body
Implementation Method 2
a cathode disposed in the housing and configured to release electrons
Implementation Method 3
a target disposed in the housing and configured to generate X-rays upon incidence of the electrons
Data Source
AI summary
An X-ray tube includes a housing, a cathode disposed in the housing and configured to release electrons, a target disposed in the housing and configured to generate X-rays upon incidence of the electrons, a first tubular body surrounding the cathode inside the housing, and a getter disposed in a region where a trajectory of the electrons from the cathode to the target is not allowed to be seen in an inner region of the first tubular body.