Optical Element with Orthogonal Pillars for Solar Shading
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Solution Overview
Problem
Existing solar shading films that reflect solar light directionally to mitigate the heat island phenomenon often suffer from stripe-like film-thickness irregularities during the enclosing and burying process, degrading film visibility.
Innovation Solution
An optical element with a concavo-convex surface featuring a wavelength-selective reflection layer, where structural elements are oriented orthogonally to allow resin flow during the enclosing process, preventing irregularities and maintaining transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflection layer is formed on a concavo-convex surface and enclosed with a resin material, then directional reflection of solar light is achieved, but stripe-like film-thickness irregularities are generated during the enclosing process
Solution Approach 1:
The concavo-convex surface is segmented into multiple independent pillar-shaped elements arranged in a matrix pattern. This segmentation allows the resin material to flow into the spaces between pillars uniformly, preventing stripe-like film-thickness irregularities while maintaining the directional reflection function of each pillar element.
Solution Approach 2:
The pillar-shaped elements are designed with specific local geometric properties (height, width, spacing) that optimize both the directional reflection performance and the resin flow characteristics during encapsulation. The local structure of each pillar is tailored to achieve uniform resin distribution without compromising the optical reflection function.
2Illumination intensity
If a reflection layer is formed on a plane surface, then regular reflection occurs, but light rays reach the ground and cause heat island phenomenon
Solution Approach 1:
Instead of using a plane surface that produces regular reflection toward the ground, the invention inverts the approach by creating a concavo-convex surface with pillar elements that redirect reflected light upward toward the sky. This inversion changes the reflection direction from harmful (groundward) to beneficial (skyward), mitigating the heat island effect.
Solution Approach 2:
The invention transitions from a two-dimensional plane surface to a three-dimensional concavo-convex surface with vertically extended pillar elements. This dimensional change enables the reflection layer to redirect light in the vertical dimension (toward the sky) rather than only in the horizontal plane, thereby preventing light from reaching the ground and reducing heat island phenomenon.
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 suppresses the generation of stripe-like film-thickness irregularities, ensuring improved visibility and functionality of the solar shading device.
Implementation Method 1
the wavelength-selective reflection layer directionally reflects a light ray having a specific wavelength band, while transmitting light rays having wavelength bands other than the specific wavelength band
Implementation Method 2
a wavelength-selective reflection layer formed on the concavo-convex surface... the wavelength-selective reflection layer directionally reflects a light ray having a specific wavelength band
Data Source
AI summary
An optical element is provided with an optical layer in which a concavo-convex surface is formed on the surface thereof, and a wavelength-selective reflection layer formed on the concavo-convex surface. The wavelength-selective reflection layer directionally reflects light having a specific wavelength band selectively, while transmitting light having wavelength bands other than the specific wavelength band. The concavo-convex surface is provided with a plurality of first structural elements that are extended in a first direction within the surface of the optical layer and a plurality of second structural elements that are extended in a second direction within the surface of the optical layer, and placed to be spaced apart from each other, with the first direction and the second direction intersecting with each other.