Radiation Detector Adhesion via Localized Protective Films
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Solution Overview
Problem
Conventional radiation detectors face challenges in maintaining adhesion strength between the scintillator layer and the substrate, as well as between the moisture-proof body and the substrate, leading to characteristics degradation and moisture permeation, especially in high-temperature high-humidity and cold-hot environments.
Innovation Solution
The radiation detector incorporates an organic resin protective layer as the outermost layer in the active area for the scintillator layer and an inorganic protective film as the outermost layer in the bonding area, with a moisture-proof body and adhesive layer configuration that enhances adhesion strength and moisture-proof performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single material is used for the substrate outermost layer, then the structure is simple and manufacturing is easy, but adhesion strength cannot be optimized for both the scintillator layer and the moisture-proof body simultaneously
Solution Approach 1:
The substrate outermost layer is designed with different materials for different regions: the active area has an organic resin protective layer optimized for scintillator adhesion, while the bonding area has an inorganic protective film optimized for moisture-proof body adhesion. This local differentiation allows each region to have optimal adhesion properties without compromising the other.
Solution Approach 2:
The substrate outermost layer is segmented into two distinct regions with different materials. The active area region uses organic resin while the bonding area region uses inorganic protective film, allowing independent optimization of adhesion characteristics for each functional zone.
2Manufacturing precision
If the scintillator layer is formed by vacuum evaporation, then the film quality is high and resolution is improved, but adhesion strength is insufficient leading to peeling in subsequent processes
Solution Approach 1:
An organic resin protective layer is introduced as an intermediary between the vacuum-evaporated scintillator layer and the substrate. This intermediate layer provides optimal adhesion properties for the scintillator while maintaining the high film quality achieved through vacuum evaporation processing.
3Reliability
If a conventional moisture-proof structure is used, then moisture-proof performance is adequate, but adhesion strength between the moisture-proof body and substrate degrades in high-temperature high-humidity environments
Solution Approach 1:
The material properties of the substrate outermost layer in the bonding area are changed by using an inorganic protective film instead of conventional organic materials. This parameter change provides superior adhesion strength that remains stable in high-temperature high-humidity environments, ensuring reliable moisture-proof performance.
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 ensures high reliability by maintaining strong adhesion between the scintillator layer and the substrate, and between the moisture-proof body and the substrate, preventing peeling and moisture permeation, even in extreme environments.
Implementation Method 1
The scintillator layer is formed on the organic resin protective layer so as to cover the photoelectric conversion element and configured to convert radiation to the fluorescence
Implementation Method 2
pixels are formed in a matrix on the substrate. The pixel includes a photoelectric conversion element such as photodiode
Implementation Method 3
The reflective film is configured to increase fluorescence reaching the photoelectric conversion element side by reflecting the fluorescence emitted by the scintillator layer
Implementation Method 4
The adhesive layer is formed on the inorganic protective layer and bonds the moisture-proof body to the substrate
Data Source
Figure 1~2
Figure 3A~4
Figure 5~7
AI summary
[Problem] To provide a radiation detector that has excellent adhesion between a scintillator layer and a substrate and between a moisture-proof body and a substrate, and that is highly reliable in cold environments and in high-temperature high-humidity environments. [Solution] A radiator detector (11) comprises the following: an array substrate (12) having pixels (17); a scintillator layer (13) formed on the pixels (17); a conductive moisture-proof body (15) formed so as to cover the scintillator layer (13); and an adhesive layer (16) that adheres the moisture-proof body (15) to the array substrate (12). The array substrate (12) of the radiation detector is divided into at least an active area (A) and an adhesion are (B), the active area (A) is provided with an organic-resin protective film (26a) on the scintillator layer (13) forming surface, and the adhesive area (B) is provided with an inorganic protective film (26b) on the adhesive layer (16) forming surface.