Acrylic Light Diffusion Material Spectral Uniformity
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Solution Overview
Problem
Current acrylic light diffusion materials exhibit poor spectral uniformity, especially with LED light sources, leading to significant losses in transmission efficiency for wavelengths in the near-UV range, which is problematic for applications like Violet LED disinfection.
Innovation Solution
A 0.080″ thick light diffusing cover composed of a transparent polymer matrix with 0.1 to 40 weight percent of diffusing particles, providing a light transmission of greater than 40% across the visible spectrum with minimal variation (less than 6% absolute difference) and a hiding performance of at least 65%.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If scattering particles are added to the cover to soften LED light and improve diffusion, then hiding performance is improved, but light transmission is reduced
Solution Approach 1:
The patent applies parameter changes by carefully controlling the particle size distribution (bimodal or multimodal with specific ranges), particle concentration (0.1-40 wt%), and refractive index mismatch parameters to optimize both hiding performance and light transmission. This resolves the contradiction by finding the optimal parameter range where diffusion effectiveness is achieved without excessive light loss.
Solution Approach 2:
The patent uses composite materials by combining multiple types of scattering particles (inorganic and organic) with different size ranges and refractive indices within the polymer matrix. This composite approach allows the system to achieve both high hiding performance and maintained light transmission by leveraging the complementary properties of different particle types.
2Ease of operation
If conventional diffusion materials are used with LED light sources, then diffusion is achieved, but spectral uniformity deteriorates with significant transmission loss in near-UV range
Solution Approach 1:
The patent addresses spectral uniformity by changing the particle size distribution parameters (using bimodal or multimodal distributions with specific size ranges), selecting particles with appropriate refractive indices, and optimizing concentration levels. These parameter adjustments ensure uniform light transmission across the visible spectrum including the near-UV range while maintaining effective diffusion.
Solution Approach 2:
The patent employs composite materials combining inorganic particles (such as TiO2, SiO2, BaSO4) with organic particles, each contributing different optical properties. This composite structure enables the material to maintain spectral uniformity across different wavelengths while providing effective light diffusion, resolving the contradiction between diffusion and spectral stability.
3Ease of manufacture
If high concentration of scattering particles is used to improve hiding performance, then diffusion and hiding are improved, but light transmission and spectral uniformity worsen
Solution Approach 1:
The patent optimizes the particle concentration parameter within the range of 0.1-40 wt% (preferably 0.5-20 wt%) to achieve the right balance. This parameter optimization ensures sufficient hiding performance and diffusion while preventing excessive light absorption and scattering that would reduce transmission and compromise spectral uniformity.
Solution Approach 2:
The patent applies local quality by using a bimodal or multimodal particle size distribution where smaller particles (0.1-10 μm) provide effective scattering for hiding performance, while larger particles (10-100 μm) contribute to diffusion. This localized optimization of particle functions within different size ranges achieves both high hiding performance and maintained light transmission.
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 achieves high spectral uniformity and light transmission across the visible spectrum, effectively addressing the issue of poor spectral uniformity in existing materials while maintaining sufficient hiding performance.
Implementation Method 1
The scattering of the light emitted by the light source is achieved by dispersing scattering particles of organic or mineral nature in the plastic
Implementation Method 2
Light transmission and diffusion can be managed through the use of diffusion particles-both inorganic and organic in a polymer matrix
Data Source
AI summary
The invention relates to an acrylic light diffusing material providing spectral uniformity over the visible light range, defined herein as from 400 to 800 nm. The light diffusing material provides a uniform light transmission for light engines having two or more light sources with different spectral emission peaks. Due to its high hiding performance, the light diffusing material of the invention is especially useful with LED point light sources. The diffusing material contains a transparent polymer matrix and one or more types of diffusing materials, providing an optimal balance of spectral uniformity, light transmission, diffusion, and hiding performance.