X-Ray Target and Window Layout for Short FOD Imaging
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Solution Overview
Problem
The existing X-ray generation devices face a decrease in X-ray generation efficiency when the electron beam is incident at an angle close to parallel to the target portion, leading to reduced contrast and focus-to-object distance (FOD), which affects image quality in imaging devices.
Innovation Solution
The X-ray generation device is designed with a target portion having elongated targets disposed parallel to each other, an electron gun, and an X-ray emission window positioned to allow perpendicular X-ray emission, maintaining a sufficient inclination angle for electron beam incidence, thereby preventing parallel incidence and ensuring efficient X-ray generation while supporting target cooling and heat management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the space between the X-ray emission window and the target portion is narrowed to reduce FOD and improve image magnification, then the focus-to-object distance decreases and image magnification improves, but the electron beam incident angle becomes closer to parallel with the target portion surface, causing electron beam reflection and decreased X-ray generation efficiency
Solution Approach 1:
The patent introduces a new spatial dimension by tilting the X-ray emission window relative to the target portion. Instead of simply narrowing the space between components, the window is disposed at an inclination angle θ2 (0° < θ2 ≤ 90°) with respect to the normal direction of the target portion. This dimensional change allows the X-ray emission path to be separated from the electron beam incidence path, enabling small FOD while maintaining optimal electron beam incidence angles for efficient X-ray generation.
2Length of stationary object
If the electron beam incident angle is adjusted to be closer to parallel with the target portion to reduce FOD, then the focus-to-object distance decreases, but the electron beam is reflected on the target portion surface and X-ray generation efficiency decreases
Solution Approach 1:
The patent segments the functional relationships by separating the electron beam incidence function from the X-ray emission function. The target portion maintains its orientation for optimal electron beam incidence, while the X-ray emission window is independently tilted at angle θ2 to direct X-rays toward the imaging device. This segmentation allows each component to be optimized for its specific function without compromising the other.
3Illumination intensity
If the X-ray emission window is disposed parallel to the target portion to emit X-rays perpendicular to the target portion, then the X-ray contrast is sufficient for imaging, but the space between the electron gun and target portion must be narrowed, causing the electron beam incident angle to become too shallow
Solution Approach 1:
The patent introduces asymmetry in the geometric configuration by tilting the X-ray emission window at an angle θ2 relative to the normal of the target portion. This asymmetric disposition breaks the symmetry between the electron beam incidence geometry and the X-ray emission geometry, allowing the X-ray window to be optimized for image contrast while the electron beam incidence angle is independently optimized for maximum X-ray generation efficiency.
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 achieves a sufficient X-ray generation efficiency, desired contrast, and optimal focus-to-object distance, enhancing image quality by maintaining electron beam incidence efficiency and reducing target consumption through effective heat transfer and cooling.
Implementation Method 1
a target portion in which a plurality of elongated targets that generate an X-ray because of incidence of the electron beam are disposed parallel to each other
Implementation Method 2
targets that generate an X-ray because of incidence of the electron beam
Implementation Method 3
an X-ray emission window portion provided in the housing portion to emit the X-ray generated in the target portion, to an outside of the housing portion
Data Source
AI summary
An X-ray generation device includes: an electron gun that emits an electron beam; a target portion in which a plurality of elongated targets that generate an X-ray because of incidence of the electron beam are disposed parallel to each other; a housing that accommodates the electron gun and the target portion; and an X-ray emission window provided in the housing to emit the X-ray generated in the target portion, to an outside of the housing. The targets are disposed on the target portion to face the electron gun at a predetermined inclination angle with respect to an emission axis of the electron beam. The X-ray emission window is disposed at a position where the X-ray generated in a direction perpendicular to the target portion is transmittable through the X-ray emission window, to face the target portion at a predetermined inclination angle.