Optical Body with Random Concave-Convex Surface for Solar Shading
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional window films for solar shading accelerate the heat-island phenomenon by specularly reflecting sunlight, leading to local temperature rises and adverse effects on urban areas, and also cause diffraction patterns when viewing lights at a distance.
Innovation Solution
An optical body with a random concave-convex surface and a wavelength-selective or semi-transmissive reflecting layer that diffusely reflects specific wavelengths of light, reducing heat absorption and suppressing diffraction patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a flat window glass with a reflecting layer is used for solar shading, then the sunlight reflection efficiency is improved, but the heat-island phenomenon is accelerated and local temperature rise occurs
Solution Approach 1:
The patent applies a random concave-convex surface structure to the window glass instead of a flat surface. This curvature variation causes incident sunlight to reflect in multiple directions rather than specularly, reducing the concentration of reflected heat energy in specific areas and thereby suppressing the heat-island phenomenon while maintaining solar shading effectiveness.
Solution Approach 2:
The random concave-convex surface introduces asymmetry in the surface geometry, creating varied reflection angles for incident light. This asymmetric structure prevents uniform reflection patterns that would concentrate heat in specific directions, thus reducing the harmful thermal effects on surrounding environments.
2Ease of operation
If a regular array structure is used on the optical layer, then the directional reflection control is improved, but diffraction patterns appear when viewing lights at a distance
Solution Approach 1:
The patent transitions from a uniform regular array structure to a random concave-convex surface structure where each local area has varying geometric properties. This local variation in surface quality prevents the formation of coherent diffraction patterns while still providing effective directional control of reflected light through the statistical distribution of surface features.
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 effectively reduces the heat-island phenomenon and eliminates diffraction patterns, providing clear transmission images while efficiently managing solar radiation.
Implementation Method 1
a first optical layer having a random concave-convex surface, a reflecting layer formed on the concave-convex surface... for diffusely reflecting, of incident light, light in a specific wavelength band
Implementation Method 2
the reflecting layer is a wavelength-selective reflecting layer for diffusely reflecting, of incident light, light in a specific wavelength band and transmitting light other than the specific wavelength band therethrough
Implementation Method 3
the occurrence of the diffraction pattern can be suppressed by forming the concave-convex surface of the first optical layer in a random shape
Data Source
AI summary
An optical body includes a first optical layer having a random concave-convex surface, a reflecting layer formed on the concave-convex surface, and a second optical layer formed on the reflecting layer to embed the concave-convex surface, wherein the reflecting layer is a wavelength-selective reflecting layer for diffusely reflecting, of incident light, light in a specific wavelength band and transmitting light other than the specific wavelength band therethrough.