Glass Structure UV Absorbing Layer for Light Control Body Protection
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Solution Overview
Problem
Light control bodies with liquid crystal or electrochromic materials deteriorate rapidly when exposed to sunlight, and existing glass structures fail to provide high transparency and effective sunlight shielding.
Innovation Solution
A glass structure with a pair of glass plates and a light control body, featuring an ultraviolet absorbing layer between the glass plates, which has specific transmittance properties to block long-wavelength ultraviolet rays while maintaining high visible light transmittance, using thermoplastic resins and ultraviolet absorbers like indole-based, benzotriazole-based, or coumarin-based compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the glass plate and adhesion layer are designed for high transparency to secure visibility, then the light permeability in visible light range is improved, but the ability to shield sunlight is worsened
Solution Approach 1:
The glass structure is segmented into multiple functional layers: glass plates, adhesion layers, and a light control body. This segmentation allows each layer to perform its specific function - the glass plates provide structural support and basic transparency, while the light control body specifically blocks ultraviolet rays without significantly affecting visible light transmission.
Solution Approach 2:
The light control body acts as an intermediary element between the glass plates. It selectively absorbs harmful ultraviolet radiation while allowing visible light to pass through, thus mediating between the need for sunlight shielding and the need for high transparency.
2Adaptability or versatility
If the light control body is exposed to sunlight to enable outdoor use, then the sunlight shielding function is activated, but the deterioration of the light control body is accelerated
Solution Approach 1:
The light control body is designed to absorb harmful ultraviolet radiation, converting this harmful exposure into a beneficial protective function. By absorbing UV rays that would otherwise deteriorate the material, the light control body protects itself and extends its service life while enabling outdoor usability.
Solution Approach 2:
The light control body performs preliminary protection by absorbing ultraviolet rays before they can reach and deteriorate other components of the glass structure. This preliminary action of UV absorption prevents cumulative damage and extends the overall durability of the system.
3Reliability
If an ultraviolet absorbing layer is added to block long-wavelength ultraviolet rays, then the protection of light control body is improved, but the structural complexity is increased
Solution Approach 1:
The light control body serves multiple functions simultaneously: it provides sunlight shielding, blocks ultraviolet rays, and maintains high visible light transmission. This multi-functionality eliminates the need for separate ultraviolet absorbing layers, as the light control body itself performs the UV absorption function.
Solution Approach 2:
The UV absorption function is merged with the light control body rather than being implemented as a separate layer. This consolidation reduces structural complexity while achieving the same protective effect, as the light control body integrates both light modulation and UV protection capabilities.
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 glass structure effectively prevents deterioration of the light control body due to sunlight while ensuring high transparency and visibility, even when exposed to outdoor sunlight, by optimizing the ultraviolet absorbing layer's transmittance characteristics.
Implementation Method 1
the ultraviolet absorbing layer has a maximum transmittance of 10% or less in a wavelength region of 370 nm or more and 400 nm or less
Data Source
Figure 1~2
AI summary
A glass structure 10 includes a pair of glass plates 11 and 12, a light control body 13 disposed between the pair of glass plates 11 and 12, and an ultraviolet absorbing layer 14 disposed between the light control body 13 and one of the glass plates 11. The ultraviolet absorbing layer 14 has a maximum transmittance of 10% or less in a wavelength region of 370 nm or more and 400 nm or less and a maximum transmittance of 50% or more in a wavelength region of more than 400 nm and 420 nm or less, and a ratio of a transmittance at 405 nm to a transmittance at 395 nm is 12 or more.