Curved Sensor Panel Attachment for Radiography Detectors
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Solution Overview
Problem
Radiation detectors with large-area sensor panels, such as those using thin film transistors (TFTs), face stability issues due to thermal expansion and contraction differences between the sensor panel and the support table, leading to potential wrinkles and lifting of the panel, which affect image quality and stability.
Innovation Solution
A radiation detector design featuring a support table with a curved surface, a sensor panel with a curved surface attached, and a combination of fixing and contact members that securely attach the panel, including elastic contact members that deform to accommodate thermal changes and a holding member for increased rigidity, ensuring stable attachment and minimizing thermal expansion effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a large-area sensor panel with flexible substrate is attached to a metal support table with curved surface shape, then the sensor panel can achieve higher resolution and larger imaging area, but the sensor panel will experience thermal expansion and contraction differences causing wrinkles and lifting from the support table
Solution Approach 1:
The support table surface is divided into multiple attachment regions with fixing members distributed across the surface. This segmentation allows the large-area sensor panel to be secured at multiple discrete points, preventing overall thermal deformation and lifting while maintaining the large imaging area.
Solution Approach 2:
Fixing members are strategically positioned at specific locations on the support table surface rather than uniformly distributed. This local quality approach provides targeted stabilization at critical regions while allowing other areas to accommodate thermal expansion, preventing wrinkles and lifting.
2Stability of the object's composition
If the sensor panel is rigidly fixed across the entire attachment surface, then the panel stability is improved, but the thermal expansion and contraction is restricted causing wrinkles and potential damage
Solution Approach 1:
Instead of fixing the entire sensor panel surface, only specific regions are secured by fixing members. This partial action provides sufficient stability to prevent lifting and maintain positioning while leaving other areas free to expand and contract thermally, avoiding wrinkle formation and stress concentration.
Solution Approach 2:
The contact members are designed with elastic properties that allow their contact pressure with the sensor panel to change in response to thermal expansion and contraction. This parameter change enables the system to maintain stability while accommodating thermal deformations without creating harmful stresses.
3Stability of the object's composition
If contact members with high rigidity are used to press the sensor panel against the support table, then the panel stability is improved, but the thermal expansion and contraction is restricted causing deformation
Solution Approach 1:
Contact members with elastic properties are used instead of rigid components. These elastic contact members can deform under thermal stress, maintaining contact with the sensor panel while accommodating expansion and contraction, thus preventing shape deformation while preserving stability.
Solution Approach 2:
The contact members are designed to dynamically adjust their contact pressure in response to thermal changes. As the sensor panel expands or contracts, the elastic contact members deform accordingly, maintaining stable contact without imposing rigid constraints that would cause shape deformation.
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 solution effectively stabilizes the sensor panel, reducing the risk of wrinkles and lifting, thereby enhancing the stability and image quality of radiographic images, even under thermal stress, and allowing for wider and more efficient imaging without significant quality deterioration.
Implementation Method 1
the contact member is deformed according to thermal expansion and contraction of the sensor panel in a direction parallel to the attachment surface
Implementation Method 2
wrinkles caused by thermal expansion and contraction may occur in the sensor panel
Data Source
AI summary
A radiation detector includes a support table, a sensor panel, a fixing member, and a contact member. An attachment surface having an arc surface shape is formed in the support table. The sensor panel has an imaging region in which a plurality of pixels detecting radiation are two-dimensionally arranged. A first surface of the sensor panel is attached to the attachment surface following the arc surface shape. The fixing member partially fixes the first surface to the attachment surface. The contact member comes into contact with a second surface of the sensor panel which is opposite to the first surface to suppress the lifting of the sensor panel from the support table.