Radiation Detector Flexible Rigid Circuit Board Segmentation
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Solution Overview
Problem
Conventional radiation detectors with flexible circuit boards face issues such as stripping stress, mechanical damage from vibrations, noise due to deformation, and limited arrangement of electronic components, which affect connection reliability and signal quality.
Innovation Solution
A radiation detector design incorporating a flexible circuit board connected to a rigid IC mounting board with anisotropic conductive film bonding, providing stable electrical connections and reducing noise by using a multilayer circuit substrate for improved terminal connections and mechanical support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If a flexible circuit board is used to connect the photodetector and circuit board, then the detector size and weight are reduced, but connection reliability deteriorates due to stripping stress and mechanical damage from vibrations
Solution Approach 1:
The circuit board is divided into two distinct parts: a flexible circuit board for connecting the photodetector array (enabling weight reduction and thin profile) and a rigid IC mounting board for mounting signal processing ICs (providing mechanical strength and vibration resistance). This segmentation allows each part to fulfill its specific functional requirements while overcoming the limitations of using a single board type.
Solution Approach 2:
The invention uses a composite structure combining flexible and rigid materials in the circuit board system. The flexible circuit board (using flexible PCB material) connects to the rigid IC mounting board (using rigid PCB material), creating a hybrid system that exhibits both flexibility for weight reduction and rigidity for connection reliability. This composite approach resolves the contradiction between weight reduction and connection reliability.
2Device complexity
If a flexible circuit board is used, then device complexity is reduced, but noise increases due to deformation and limited electronic component arrangement
Solution Approach 1:
By segmenting the circuit board into flexible and rigid portions, the invention isolates the IC components on the rigid portion where they can be properly arranged and grounded without the constraints of flexibility. This segmentation allows for optimal electronic component layout and grounding design, reducing noise while maintaining the simplicity of using a flexible board for the photodetector connection.
Solution Approach 2:
The rigid IC mounting board acts as an intermediary between the flexible circuit board and the signal processing ICs. It provides a stable, low-noise platform for the ICs while being connectable to the flexible board, thus mediating between the need for flexibility and the need for low-noise signal processing.
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
Enhances connection reliability, reduces noise, and maintains signal stability and signal-to-noise ratio, allowing for smaller detector size and improved performance.
Implementation Method 1
anisotropic conductive film bonding, providing stable electrical connections
Implementation Method 2
a radiation detector, comprising a fluorescent film to convert radiation, particularly X-rays into light
Implementation Method 3
a photoelectric conversion element to convert the light into an electric signal
Data Source
Figure 1
Figure 2
Figure 3A~3C
AI summary
A radiation detector includes a photodetector (19) comprising a fluorescent film to convert radiation into light, and a photoelectric conversion element to convert light into an electrical signal, a circuit board (13) which electrically drives the photodetector, and electronically processes an output signal from the photodetector, and a connection board (14) which electrically connects the photodetector and circuit board, and comprising flexible circuit board (28), and an IC mounting board (30) which is less flexible than the flexible circuit board and provided with an IC semiconductor element (29), the flexible circuit board and IC mounting board being connected to each other.