Eccentric X-ray Exit Window for Oblique Imaging
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Solution Overview
Problem
Conventional X-ray tubes face challenges in increasing the magnification ratio of enlarged perspective images for miniaturized electronic circuit boards, particularly when imaging solder balls from oblique angles, as this requires larger X-ray exit windows, leading to excessive X-ray leakage and increased costs.
Innovation Solution
The X-ray tube design features an X-ray exit window eccentric to the tube axis, allowing oblique irradiation without increasing the exit window size, which reduces X-ray leakage and enables higher magnification ratios while maintaining efficient X-ray transmission and reducing contamination risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the diameter of the X-ray exit window is increased to increase the irradiation angle for oblique imaging, then the magnification ratio of enlarged perspective images is improved, but excessive X-rays leak from the X-ray tube
Solution Approach 1:
The patent applies asymmetry by positioning the X-ray exit window eccentrically relative to the tube axis, creating an asymmetric configuration that enables oblique irradiation at high magnification ratios without requiring an increased window diameter, thus preventing excessive X-ray leakage
Solution Approach 2:
The patent utilizes dimensional change by moving the X-ray exit window from a central position on the tube axis to an eccentric position in the radial direction, enabling oblique irradiation geometry that achieves high magnification ratios without increasing the window size
2Adaptability or versatility
If the diameter of the X-ray exit window is increased to enable oblique irradiation, then the irradiation angle is improved, but equipment to prevent leakage of unnecessary X-rays becomes necessary
Solution Approach 1:
The asymmetric positioning of the X-ray exit window relative to the tube axis enables oblique irradiation with adequate irradiation angles while maintaining a compact window size, eliminating the need for additional leakage prevention equipment
Solution Approach 2:
By changing the positional dimension of the X-ray exit window from central to eccentric, the patent achieves versatile oblique irradiation capabilities without requiring additional shielding or leakage prevention components
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 design enhances the magnification ratio of enlarged perspective images while preventing unnecessary X-ray leakage, improving image clarity and reducing manufacturing costs by optimizing the X-ray exit window size and position.
Implementation Method 1
X-rays are generated by making electrons emitted from an electron gun incident into a target of the anode
Implementation Method 2
The X-rays are transmitted through an X-ray exit window provided on a tube axis of the tubular member housing the target
Data Source
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AI summary
In an X-ray tube 1A that makes electrons emitted from an electron gun 17 into a target 9 of an anode 8 arranged in a tubular vacuum enclosure body 6, and extracts the X-rays through an X-ray exit window 18, the anode 8 is arranged on a tube axis C1 -of the vacuum enclosure body 6, and in a sealing portion 5g provided at an end portion of the vacuum enclosure body 6, provided is the X-ray exit window 18 eccentric with respect to the tube axis C1 of the vacuum enclosure body 6.