Reinforced Flexible Radiation Detector to Prevent Layer Detachment
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Solution Overview
Problem
Radiation detectors face issues with the conversion layer detaching from the substrate when handled alone, as existing technologies do not adequately address the mechanical stress and flexibility of the flexible substrate, leading to potential damage during handling and use.
Innovation Solution
A manufacturing method that includes connecting flexible wiring to the substrate before affixing a reinforcement substrate, which provides additional rigidity and stability to prevent the conversion layer from detaching, using a reinforcement substrate with a higher rigidity than the base member and a yield point to suppress bending and detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a flexible base member is used in the radiation detector, then the weight is reduced and imaging of the imaging subject is facilitated, but the conversion layer may detach from the substrate due to bending of the flexible substrate
Solution Approach 1:
The patent uses a composite structure combining a flexible base member (polyimide) with a reinforcement substrate (polycarbonate or PET) that has a yield point. This composite material approach allows the detector to maintain flexibility for weight reduction while the reinforcement substrate prevents conversion layer detachment during bending, resolving the contradiction between lightweight design and structural reliability.
Solution Approach 2:
The patent introduces a reinforcement substrate with specific material parameters (yield point between 10-100 MPa, bending elastic modulus between 1000-2500 MPa) to change the mechanical behavior of the flexible base member. This parameter modification enables the substrate to resist bending forces that would otherwise cause conversion layer detachment, while maintaining overall flexibility.
2Reliability
If an electromagnetic shielding layer or support body is provided on the conversion layer, then the conversion layer is protected, but these structures do not adequately suppress detachment when the detector is handled on its own
Solution Approach 1:
The reinforcement substrate serves multiple functions simultaneously: it protects the conversion layer from detachment during handling, provides structural support, and maintains flexibility for portable applications. This multi-functionality reduces the need for separate protective components, thereby reducing overall device complexity while improving reliability.
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 method effectively suppresses the detachment of the conversion layer from the substrate during handling and use, enhancing the durability and reliability of the radiation detector.
Implementation Method 1
a conversion layer such as a scintillator to convert radiation into light
Implementation Method 2
the reinforcement substrate has a bending elastic modulus of from 1000 MPa to 2500 MPa
Implementation Method 3
the reinforcement substrate contains a material having a yield point and has a higher rigidity than the base member
Data Source
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AI summary
A radiation detector including: a substrate formed with a plural pixels in pixel region of a flexible base member, the plural pixels accumulates charges generated in response to light converted from radiation; a conversion layer provided at a surface to which the pixel region is provided on the base member, the conversion layer converts the radiation into light; and a reinforcement substrate provided at a surface of the conversion layer that faces a surface of the substrate side, the reinforcement substrate contains a material having a yield point and has a higher rigidity than the base member.