Radiation Detector Extended Electrode Stress Reduction
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Solution Overview
Problem
The existing radiation detectors using amorphous selenium charge conversion layers are prone to deterioration due to mechanical stress and scratches during manufacturing and usage, leading to reduced detection accuracy.
Innovation Solution
A radiation detector design featuring a charge conversion layer with a protection member surrounding the periphery, an extended electrode connecting to a conductor outside the protection member, and a bias electrode for applying voltage, which reduces mechanical stress on the charge conversion layer and prevents deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the high-voltage wire is connected directly to the upper electrode above the charge conversion layer, then the connection work can be performed, but the charge conversion layer is pressed or damaged by scratches from working tools, leading to deterioration
Solution Approach 1:
The patent introduces an extended electrode that protrudes from the upper electrode as an intermediary component. This extended electrode serves as a connection terminal that extends beyond the charge conversion layer, allowing high-voltage wire connection to be performed without working tools contacting the sensitive charge conversion layer, thus preventing scratches and pressing damage while enabling manufacturing connectivity
2Power
If the high-voltage wire is disposed on the charge conversion layer, then the bias voltage can be applied, but the amorphous selenium is deteriorated by crystallization due to mechanical pressure, lowering detection accuracy
Solution Approach 1:
The patent extends the electrode connection point from the vertical dimension (above the charge conversion layer) to the horizontal dimension (protruding laterally beyond the charge conversion layer boundaries). This dimensional change allows the high-voltage wire to be connected at a location that does not exert mechanical pressure on the charge conversion layer, preventing crystallization and maintaining detection accuracy while still enabling bias voltage application
3Ease of manufacture
If the charge conversion layer is exposed during high-voltage wire connection, then the wire can be connected to the upper electrode, but the charge conversion layer is subjected to mechanical stress and scratches from working tools
Solution Approach 1:
The extended electrode acts as a mediator that provides an accessible connection point for high-voltage wires without requiring exposure of the charge conversion layer. The extended electrode protrudes from the upper electrode structure, creating a dedicated connection terminal that is easily accessible for wire attachment while completely isolating the charge conversion layer from mechanical contact with working tools
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
The design effectively suppresses the deterioration of the charge conversion layer, maintaining detection accuracy and allowing for easier connection of high-voltage wires without exposing the sensitive layer, thus enhancing the stability and performance of the radiation detector.
Implementation Method 1
an indirect conversion type radiation detector, by which, after radiation such as X-rays is converted into light first, the converted light is further converted into an electric signal by photoelectric conversion
Data Source
AI summary
An extended electrode is electrically connected to a conductor in a portion outside of an inner wall of a protection member disposed on a photoconductive layer side, the pressure applied to the photoconductive layer is reduced and the deterioration of the photoconductive layer may be suppressed. Further, since the extended electrode is electrically connected to a high-voltage wire in a portion outside of the inner wall of the protection member, the extended electrode may be connected to the high-voltage wire in the state that the photoconductive layer is surrounded by the protection member. As a result, deterioration of the photoconductive layer may be suppressed even while a connection work is performed.