X-Ray Target Thickness Layout for Voltage-Adaptive Beam Incidence
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Solution Overview
Problem
Existing X-ray generation devices require complex control mechanisms to ensure the electron beam is incident at an appropriate position on the target, necessitating adjustments to both acceleration and deflection voltages.
Innovation Solution
The device employs a magnetic field-forming unit, such as a permanent magnet, to automatically adjust the deflection of the electron beam based on tube voltage, combined with a target thickness distribution that ensures appropriate incidence regardless of voltage changes, thereby simplifying control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a deflection electrode is added to control electron beam incidence position, then the electron beam can be incident at an appropriate position on the target, but the control system becomes more complex
Solution Approach 1:
The patent removes the deflection electrode from the system and instead uses a target with non-uniform thickness distribution to control electron beam incidence. By extracting the deflection electrode, the control system complexity is reduced while maintaining the ability to achieve appropriate electron beam incidence positions through the thickness variation of the target material.
Solution Approach 2:
The target is designed with non-uniform thickness distribution, where different regions of the target have different thicknesses. This local quality variation allows the electron beam to be incident at appropriate positions for different acceleration voltages without requiring active deflection control, thus simplifying the overall control system.
2Device complexity
If the target thickness is made uniform, then the target structure is simpler, but the electron beam cannot be incident at appropriate positions for varying acceleration voltages
Solution Approach 1:
The target is designed with non-uniform thickness distribution, where different regions of the target have different thicknesses. This local quality variation allows the electron beam to be incident at appropriate positions for different acceleration voltages without requiring active deflection control, thus simplifying the overall control system.
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 approach allows the electron beam to be accurately incident on the target without complicating control processes, optimizing X-ray output and reducing thermal damage across varying tube voltages.
Implementation Method 1
the radius of the circular motion of the electron caused by a Lorentz force changes
Implementation Method 2
an electron-emitting unit configured to emit an electron inside the housing
Implementation Method 3
a target configured to generate an X-ray upon an incidence of the electron inside the housing
Data Source
AI summary
An X-ray generation device includes: a housing; an electron gun including an electron-emitting unit that emits an electron inside the housing; a target that generates an X-ray upon an incidence of the electron inside the housing; a window member that seals an opening of the housing and that transmits the X-ray; a tube voltage application unit that applies a tube voltage between the electron-emitting unit and the target; and a magnetic field-forming unit for deflecting the electron by forming a magnetic field between the electron-emitting unit and the target. A thickness of the target has a distribution, and the target is disposed such that the electron is incident on a portion of the target which is relatively thinner in the thickness when the tube voltage is relatively low than when the tube voltage is relatively high.