Heat Reflective Substrate With Slit Layout for Radio Wave Transmission
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Solution Overview
Problem
Existing heat ray reflecting glass technologies compromise heat shielding performance due to slits designed for radio wave transmissibility, which reduce the area covered by the heat ray reflecting film.
Innovation Solution
A heat ray reflecting substrate is configured with a dielectric substrate and a heat ray reflecting film, featuring a radio wave transmitting region with a slit portion that causes optical scattering, ensuring both excellent radio wave transmissibility and heat ray reflection performance by optimizing solar heat gain coefficients and luminous transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If slits are provided in the heat ray reflecting film to allow radio waves to transmit, then radio wave transmissibility is improved, but heat shielding performance deteriorates due to reduced area covered by the heat ray reflecting film
Solution Approach 1:
The patent applies local quality by creating distinct regions with different properties: regions with slits for radio wave transmission and regions without slits for heat reflection. The slit portions are strategically positioned and sized to allow radio waves to pass through while the non-slit portions maintain heat ray reflection, achieving both functions simultaneously in different local areas of the same substrate
Solution Approach 2:
The patent utilizes parameter changes by controlling the aperture rate (ratio of slit area to total area) and the dimensions of slit portions to optimize both radio wave transmission and heat reflection. By adjusting these parameters, the patent achieves a balance where sufficient radio wave transmissibility is obtained while maintaining adequate heat shielding performance through the remaining heat ray reflecting film area
2Adaptability or versatility
If the area covered by the heat ray reflecting film is reduced to improve radio wave transmissibility, then radio wave transmission is enhanced, but heat ray reflection performance deteriorates
Solution Approach 1:
The patent creates local quality differences by having slit portions in some regions and non-slit portions in other regions. This allows the substrate to exhibit different properties in different areas: high radio wave transmission in slit regions and high heat reflection in non-slit regions, thereby maintaining overall heat ray reflection performance while enabling radio wave transmission
Solution Approach 2:
The patent applies partial action by providing slits only in specific regions rather than across the entire substrate. The aperture rate is controlled to be within a specific range, ensuring that enough heat ray reflecting film remains to maintain reliable heat reflection performance while still providing sufficient radio wave transmission capability
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 substrate achieves enhanced radio wave transmissibility while maintaining good heat ray reflection performance, effectively addressing the trade-off between these two properties in previous technologies.
Implementation Method 1
a heat ray reflecting film formed on at least one main surface of the dielectric substrate
Implementation Method 2
the radio wave transmitting region includes a slit portion where the heat ray reflecting film is not present
Implementation Method 3
the inventors of the present invention have found that when a heat ray reflecting substrate is configured to cause optical scattering in a slit portion
Data Source
Figure 1(A)~1(B)
Figure 2
Figure 3
AI summary
The present invention relates to a heat reflective substrate that comprises a dielectric substrate and a heat reflective film on at least one principal surface of the dielectric substrate, and has a radio wave transmissive region on at least part of the at least one principal surface in plan view, wherein the radio wave transmissive region is provided with a slit portion where the heat reflective film is not present, and in the radio wave transmissive region, a solar radiation heat acquisition rate (g0) obtained by a predetermined method in a region not including the slit portion, and a solar radiation heat acquisition rate (g1) in a region including the slit portion satisfy a specific relationship.