Anode Connecting Electrode Layer Same-Side Bonding for Crack Prevention
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Solution Overview
Problem
In X-ray generating tubes, the repeated temperature rises and drops due to X-ray generation cause stress concentration at bonding boundaries, leading to potential cracks in the conductive layer, destabilizing the anode potential and electron beam trajectory, which complicates maintaining a steady X-ray dose.
Innovation Solution
The anode design includes a tubular anode member with a connecting electrode layer that is bonded to both the supporting substrate and the anode member on the same side, reducing stress on bonding boundaries and preventing cracks by ensuring the connecting electrode layer is not sandwiched between them, thus maintaining electrical conductivity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conductive layer is sandwiched between the anode member and the target supporting substrate to electrically connect them, then the electrical conductivity is improved, but the bonding boundaries experience stress concentration during repeated temperature cycles, leading to crack formation
Solution Approach 1:
The patent repositions the bonding boundaries from being distributed on both sides of the conductive layer to being concentrated on the same side. This dimensional reorganization changes the stress distribution pattern, preventing stress concentration at multiple bonding interfaces and eliminating the root cause of crack formation during thermal cycling.
Solution Approach 2:
The patent extracts the conductive layer from the sandwiched configuration between the anode member and target supporting substrate, and repositions it so that both bonding boundaries are on the same side. This extraction from the harmful sandwiched structure eliminates the repeated stress concentration that causes cracking while preserving the electrical conductivity function.
2Productivity
If the conductive layer is made thin to reduce interference with electron beam, then the X-ray generation efficiency is improved, but the bonding boundaries become more susceptible to stress concentration and crack formation
Solution Approach 1:
The patent repositions both bonding boundaries to the same side of the thin conductive layer, which prevents stress concentration even in the thin film structure. This allows the conductive layer to maintain its thin profile for high X-ray generation efficiency while the repositioned bonding boundaries protect against crack formation during thermal cycling.
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 stabilizes the X-ray dose by preventing cracks in the conductive layer, ensuring consistent anode potential and electron beam trajectory, thereby enhancing the reliability and stability of the X-ray generating apparatus.
Implementation Method 1
The accelerated electrons collide with a target layer formed in the anode, thereby generating an X-ray
Implementation Method 2
repeated rises/drops in the temperature of the target layer. As a result, not only the target layer but also a supporting substrate of the target layer, an anode member, and a conductive layer connected to the target layer and to the anode member repeatedly rise and drop in temperature, and expand and shrink at thermal expansion coefficients of their respective materials
Data Source
AI summary
Provided is an anode capable of keeping the X-ray dose steady in an X-ray generating tube by preventing a crack in a connecting electrode layer, which electrically connects a target layer and an anode member. The anode includes a first bonding boundary where the connecting electrode layer, which electrically connects the target layer and the anode member, is bonded to a supporting substrate of a target, and a second bonding boundary where the connecting electrode layer is bonded to the anode member in which the connecting electrode layer is formed so that the first bonding boundary and the second bonding boundary are on the same side with respect to the connecting electrode layer.