Radiographic Detector Base With Anisotropic Heat Diffusion
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Solution Overview
Problem
Existing radiographic image detection devices suffer from non-uniform temperature distribution on the base surface due to varying heat generation by circuit substrates, leading to local heating of the sensor panel and degradation of image quality.
Innovation Solution
The device employs a base with anisotropic thermal conductivity, specifically using pitch-based carbon fiber reinforced resin to align fiber directions for high thermal conductivity in one direction, thereby diffusing heat evenly across the rear surface and reducing local heating of the sensor panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a base with isotropic thermal conductivity (honeycomb structure) is used to insulate the sensor panel from circuit substrate heat, then heat transfer to the sensor panel is reduced, but non-uniform temperature distribution on the base surface causes local heating of the sensor panel and image quality degradation
Solution Approach 1:
The base is designed with spatially varying thermal conductivity properties. The region beneath circuit substrates has higher thermal conductivity to dissipate heat, while other regions maintain insulating properties. This local differentiation of thermal conductivity prevents non-uniform temperature distribution and protects image quality while maintaining overall heat insulation.
Solution Approach 2:
The base employs a composite structure combining materials with different thermal conductivity characteristics. By integrating heat-conductive materials in specific regions with insulating materials in other regions, the base achieves both heat insulation functionality and uniform temperature distribution, resolving the contradiction between reducing heat transfer and preventing local heating.
2Adaptability or versatility
If circuit substrates are arranged with various sizes, shapes, and layouts to fulfill functional requirements, then device functionality is achieved, but non-uniform heat generation causes non-uniform temperature distribution on the base surface
Solution Approach 1:
The base's thermal conductivity is tailored to match the specific layout and heat generation characteristics of circuit substrates. Regions with high heat generation from variously sized and shaped circuit substrates are designed with higher thermal conductivity, while regions with low heat generation maintain lower thermal conductivity. This local adaptation allows flexible circuit substrate arrangements while maintaining temperature uniformity.
3Object-affected harmful factors
If heat insulation measures are implemented to prevent heat transfer to the sensor panel, then sensor panel heating is reduced, but non-uniform temperature distribution still causes local density unevenness in radiographic images
Solution Approach 1:
The base's thermal conductivity parameter is strategically varied across different regions. By adjusting the thermal conductivity parameter locally rather than uniformly, the base achieves both heat insulation (reducing overall heat transfer to the sensor panel) and temperature uniformity (preventing local density unevenness in images). This parameter differentiation resolves the contradiction between heat insulation and image quality.
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 effectively prevents local heating of the sensor panel, maintaining image quality by ensuring uniform temperature distribution and reducing local density unevenness in radiographic images.
Implementation Method 1
a base having a front surface to which the sensor panel is attached and a rear surface on which circuit substrates of various circuits are mounted, wherein the base has anisotropic thermal conductivity in at least the rear surface
Implementation Method 2
the base has anisotropic thermal conductivity in at least the rear surface
Data Source
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AI summary
Provided is a radiographic image detection device that can reduce the possibility that a sensor panel will be locally heated by the driving heat of a circuit substrate and can suppress the degradation of the quality of a radiographic image. A first sensor panel, a second sensor panel, and a base are accommodated in a housing of an electronic cassette. Circuit substrates are mounted on a rear surface of the base. The base is made of a pitch-based carbon fiber reinforced resin obtained by impregnating a pitch-based carbon fiber with a matrix resin. The fiber directions of the pitch-based carbon fibers are aligned with one direction. Therefore, the base has high thermal conductivity in a direction parallel to the fiber direction. As a result, the driving heat of the circuit substrates is rapidly diffused to the entire rear surface.