Radiation Image Detection Panel With High Modulus Optical Coupling Layer
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Solution Overview
Problem
Radiation image detection devices face issues with image sharpness due to light scattering through protective layers and experience image unevenness and peeling caused by temperature fluctuations, especially when the adhesive layer is not in direct contact with the scintillator.
Innovation Solution
A radiation image detection panel design where the scintillator layer is in direct contact with a thermoplastic optical coupling layer, which has a storage elastic modulus of 1×10^7 Pa or more at 0 to 40°C, ensuring minimal deformation from temperature changes and maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective layer is disposed on the scintillator, then the scintillator is protected, but light scattering occurs and sharpness is lowered
Solution Approach 1:
The patent removes the protective layer from the scintillator surface, extracting the harmful element that causes light scattering. This allows light to pass directly from the scintillator to the optical coupling layer without scattering, thereby improving image sharpness while the scintillator remains protected through alternative means.
Solution Approach 2:
The patent introduces an optical coupling layer as an intermediary between the scintillator and the sensor panel. This intermediary layer serves multiple functions: it maintains direct contact with the scintillator to prevent light scattering, provides optical coupling for efficient light transmission, and acts as a protective interface.
2Device complexity
If the adhesive layer is not in direct contact with the scintillator, then the structure is simplified, but image unevenness and peeling occur due to temperature fluctuation
Solution Approach 1:
The patent merges the optical coupling layer and adhesive layer into a single integrated component. This optical coupling layer is made of thermoplastic resin that directly contacts the scintillator, combining the functions of optical coupling and adhesion. This integration ensures direct contact with the scintillator, preventing image unevenness and peeling caused by temperature fluctuations while maintaining structural simplicity.
3Strength
If the optical coupling layer penetrates between columnar crystals, then adhesion is improved, but deformation occurs due to temperature fluctuation
Solution Approach 1:
The patent changes the material parameter of the optical coupling layer by selecting thermoplastic resin with specific physical properties: storage elastic modulus of 1×10^7 Pa or more at 0 to 40°C and glass transition temperature of -50°C or lower. These parameter changes enable the layer to maintain adequate adhesion while resisting deformation under temperature fluctuations.
Solution Approach 2:
The patent uses composite material design by incorporating fillers or additives in the thermoplastic resin to achieve the desired balance between adhesion strength and dimensional stability. The optical coupling layer is formulated as a composite material that provides both strong bonding to columnar crystals and resistance to thermal 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
This design enhances image sharpness and prevents image unevenness by maintaining the integrity of the optical coupling layer, even under temperature fluctuations, resulting in a stable and high-quality radiation image detection.
Implementation Method 1
a scintillator layer for converting radiation into light that can be detected by the light receiving elements
Implementation Method 2
an optical coupling layer... a material constituting the optical coupling layer has a storage elastic modulus of 1×10^7 Pa or more at 0 to 40° C.
Implementation Method 3
a material constituting the optical coupling layer has a storage elastic modulus of 1×10^7 Pa or more at 0 to 40° C.
Data Source
AI summary
A radiation image detection panel includes: a scintillator layer formed of columnar crystals; an optical coupling layer; and a planar light receiving element, wherein a material constituting the optical coupling layer has a storage elastic modulus of 1×107 Pa or more at 0 to 40° C.