Diffusive Body for Illumination Device with Nanoparticle Scattering
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Solution Overview
Problem
Existing illumination devices that simulate a natural sky face challenges in achieving a low-profile design while maintaining color uniformity and effectively reproducing the sky's color tone, as they often require a thick structure and suffer from color unevenness due to Rayleigh scattering.
Innovation Solution
A diffusive body with a scattering layer and a transmission layer, where light enters through an end part, allowing light to move back and forth between the layers, utilizing nanoparticles for scattering, and a multilayer structure to control light incidence and exit angles, reducing color unevenness and achieving a higher correlated color temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If light enters through the end part of the diffusive body to achieve a low-profile shape, then the device thickness is reduced, but color unevenness occurs due to preferential scattering of higher correlated color temperature light
Solution Approach 1:
The diffusive body is divided into multiple light guide paths with different light guide distances. By segmenting the light guide function across multiple paths, the patent achieves both low profile thickness and uniform color distribution, as shorter paths prevent excessive scattering of blue light while still enabling effective Rayleigh scattering for sky color reproduction
Solution Approach 2:
Different regions of the diffusive body have different optical properties. The patent creates local variations in light guide distance and scattering characteristics, allowing certain areas to have shorter light guide paths that reduce color unevenness while maintaining overall sky color reproduction effectiveness
2Manufacturing precision
If the concentration of particles is reduced to lower scattering probability, then color unevenness is reduced, but the ability to reproduce sky color tone deteriorates
Solution Approach 1:
The patent optimizes the particle concentration parameter to achieve a balance between scattering probability and color uniformity. By carefully controlling the concentration of scattering particles in the diffusive body, the system maintains sufficient Rayleigh scattering for blue sky color reproduction while avoiding excessive scattering that would cause color unevenness
3Device complexity
If a single-layer diffusive structure is used, then the device complexity is reduced, but the ability to control light emission angles and reproduce sky appearance deteriorates
Solution Approach 1:
The patent transitions from a single-layer structure to a multilayer structure with different functional layers. This dimensional change in structural complexity enables independent control of scattering and light guiding functions, allowing precise control over light emission angles and sky color reproduction while maintaining reasonable device complexity
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 enables a low-profile illumination device that effectively reproduces the sky's color tone with reduced color unevenness, achieving a higher correlated color temperature and improved light utilization efficiency.
Implementation Method 1
the scattering layer includes an optical medium on a nanometer order and generates the scattered light by having the entered first light scattered by the optical medium on the nanometer order, and a correlated color temperature of the scattered light is higher than the correlated color temperature of the first light
Implementation Method 2
the diffusive body functions as a light guide path that makes the entered first light move to and fro between the scattering layer and the transmission layer
Data Source
AI summary
The diffusive body lets first light enter and emits scattered light, wherein a scattering layer and a transmission layer, the diffusive body has a light incidence surface that lets the first light enter and a main surface where a first light emission surface emitting the scattered light is formed, the light incidence surface is formed at an end face forming a first end part of the main surface, the diffusive body functions as a light guide path that makes the entered first light move to and fro between the scattering layer and the transmission layer, the scattering layer includes an optical medium on a nanometer order and generates the scattered light by having the first light scattered by the optical medium on the nanometer order, and a correlated color temperature of the scattered light is higher than the correlated color temperature of the first light.