Radiation Detector Reflective Layer Peeling Suppression

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Solution Overview

Problem

Radiation detectors face issues with the peeling of reflective light layers due to substrate bending, particularly in flexible substrates, which degrades image quality when pressure-sensitive adhesives are used for fixation.

Innovation Solution

A radiation detector design featuring a reflective pressure-sensitive adhesive layer directly on the conversion layer, with an adhesive layer covering the substrate surface, and a protective layer to prevent peeling and maintain image quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a pressure sensitive adhesive layer is provided between the reflective layer and the conversion layer to fix the reflective layer, then the peeling of the reflective layer is suppressed, but the image quality of the radiographic image degrades

Engineering Contradiction:

Improvepeeling suppressionVSAvoidimage quality

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

An adhesive layer is introduced as an intermediary component between the reflective layer and the substrate. This adhesive layer has different properties from the pressure sensitive adhesive layer: it provides strong bonding to suppress peeling of the reflective layer, while being positioned such that it does not interfere with the optical path and thus does not degrade image quality. The adhesive layer acts as a mediator that resolves the contradiction between mechanical fixation and optical performance.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If the substrate has flexibility to improve adaptability, then the reflective layer is easily peeled off due to bending, but flexibility is needed for application

Engineering Contradiction:

ImproveflexibilityVSAvoidpeeling resistance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The adhesive layer is provided in advance between the reflective layer and the substrate to cushion and prevent peeling that would otherwise occur during bending. This preparatory measure ensures that when the flexible substrate is bent during use, the reflective layer remains firmly attached and does not peel off, thus maintaining reliability while preserving the flexibility needed for application.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 suppresses peeling of the reflective layer without degrading image quality, even in flexible substrates, by ensuring strong adhesion and protection, thus enhancing the performance of radiographic imaging.

Implementation Method 1

a conversion layer that converts the radiation into light

Methodology Applied

Scientific EffectPhotoelectric effect: Photoelectric Effect

Implementation Method 2

a reflective pressure sensitive adhesive layer that reflects the light converted by the conversion layer

Methodology Applied

Scientific EffectLight reflection: Reflection

Data Source

PatentUS11633162B2Radiation detector and radiographic imaging apparatus

Publication Date: 2023.04.25 FUJIFILM CORP

AI summary

Provided is a radiation detector having a portion in which a substrate in which a plurality of pixels for accumulating electric charges generated in accordance with light converted from radiation are formed in a pixel region, a conversion layer that converts radiation into light, a reflective pressure sensitive adhesive layer that reflects the light converted by the conversion layer, and an adhesive layer that covering a region including a region ranging from an end part of the pressure sensitive adhesive layer to a surface of the substrate are provided in this order.