Scintillator Panel Thermal Expansion Compensation Layer
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Solution Overview
Problem
Scintillator panels with resin substrates face warpage and crack formation due to thermal expansion differences between the phosphor and substrate, leading to image quality deterioration, and existing solutions require rigid plates or warpage prevention films.
Innovation Solution
A scintillator panel with a flexible substrate and a thermal expansion compensation layer having a higher linear expansion coefficient than the phosphor, covered with a moisture-impermeable protective layer, to maintain constant contact with the photoelectric conversion device without using rigid plates or films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a resin substrate is used to meet demands for lighter weight and thinner thickness, then weight and thickness are reduced, but the scintillator panel warps and cracks due to thermal expansion differences
Solution Approach 1:
The patent introduces a thermal expansion compensation layer with a linear expansion coefficient greater than that of the phosphor layer. This layer compensates for thermal expansion differences between the resin substrate and phosphor during heating processes, preventing warpage and crack formation while maintaining the lightweight and thin characteristics of the resin substrate.
2Reliability
If a thermal expansion compensation layer is added to prevent warpage, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent controls the linear expansion coefficient of the thermal expansion compensation layer to be within a specific range (10-50 ppm/K) and maintains its thickness between 1-100 μm. By optimizing these parameters, the layer effectively compensates for thermal expansion while minimizing the increase in structural complexity.
Solution Approach 2:
The thermal expansion compensation layer is formed as a composite structure combining a resin base material with inorganic particles. This composite approach provides the necessary thermal expansion characteristics while maintaining flexibility and adhesion to the phosphor layer, reducing the need for additional rigid support structures.
3Weight of moving object
If the scintillator panel is made flexible to reduce weight, then weight is reduced, but the panel cannot maintain constant contact with the photoelectric conversion device
Solution Approach 1:
The thermal expansion compensation layer ensures that the flexible substrate maintains constant contact with the photoelectric conversion device by compensating for thermal expansion during operation. This allows the lightweight flexible design to preserve stable contact without requiring rigid support structures.
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
Prevents warpage and crack formation in the scintillator panel, ensuring consistent image quality by managing thermal expansion and maintaining close contact with the photoelectric conversion device.
Implementation Method 1
a linear expansion coefficient of the thermal expansion compensation layer is greater than a thermal expansion coefficient of the phosphor
Data Source
AI summary
A scintillator panel includes: a flexible substrate; a phosphor arranged on the flexible substrate; and a thermal expansion compensation layer disposed between the flexible substrate and the phosphor, wherein a linear expansion coefficient of the thermal expansion compensation layer is greater than a thermal expansion coefficient of the phosphor, and surfaces, of the thermal expansion compensation layer and of the flexible substrate, in contact with each other each contain an organic substance.