Fold-Shaped Light Guiding Slat for Sun Protection
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Solution Overview
Problem
Existing light guiding slats for sun protection systems are rigid and cannot be coiled without deforming, leading to impaired light guiding properties and increased glare due to pendulum reflections, which result in excessive heat absorption.
Innovation Solution
The development of fold-shaped light guiding slats made from band material with micro-folds that can be coiled without substantial plastic deformation, featuring a concave-convex arch and precise fold edge positioning to ensure optimal reflection and minimal glare, allowing for flexible processing and improved daylight entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If slats are formed in fold-shape by embossing or large folds, then light guiding properties are improved, but the slats become rigid and cannot be wound on a coil for further processing
Solution Approach 1:
The slat is divided into multiple fold sections with fold edges that can be precisely positioned. This segmentation allows the slat to maintain its light guiding function while enabling coiling capability, as the folded structure can be wound without substantial plastic deformation
Solution Approach 2:
The invention changes the geometric parameters of the folds, specifically positioning fold edges at precise locations and creating a concave-convex arch shape. This parameter optimization allows the slat to spring back to its original position after coiling, maintaining light guiding properties while enabling processing flexibility
2Adaptability or versatility
If slats are wound on a coil for further processing, then processability is improved, but the slats deform or twist without springing back to their straight original position
Solution Approach 1:
The slat is given a concave-convex arch shape with specific curvature characteristics. This pre-formed curvature compensates for deformation during coiling, allowing the slat to spring back to its intended shape after winding and unrolling, thus maintaining both processability and shape stability
3Reliability
If Venetian blinds slats are arched out concavely/convexly, then light guidance is improved, but the slats cannot be coiled without creasing or plastic deformation
Solution Approach 1:
The arched slat is segmented into multiple fold sections with precisely positioned fold edges. This segmentation allows the slat to be coiled without substantial plastic deformation, as the folded structure can accommodate winding stresses while maintaining its light guiding function
Solution Approach 2:
The invention optimizes the geometric parameters of the arch and folds, specifically the position of fold edges and the curvature of the arch. These parameter changes enable the slat to spring back to its original arched position after coiling, maintaining both light guidance and coiling capability
4Illumination intensity
If slats have pendulum reflections, then more light is reflected, but heat absorption increases and glare is excessive
Solution Approach 1:
The invention creates different local reflection characteristics on the slat surface. The fold edges are precisely positioned to create monoreflectivity, where light is reflected in a controlled manner rather than creating pendulum reflections. This local quality control reduces glare and heat absorption while maintaining adequate light reflection for illumination
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 slats to maintain their shape and light guiding properties when coiled and uncoiled, reducing glare and heat absorption by ensuring monoreflectivity and minimizing pendulum reflections, thus providing effective sun protection and improved interior illumination.
Implementation Method 1
the fold edges extend between the fold sides in longitudinal direction of the light guiding slat... at least two neighbouring fold sides are folded relative to each other... ensure optimal reflection and minimal glare
Data Source
Figure 0~1.2
Figure 2.1~3.4
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AI summary
Light guiding slat for a sun protection system, wherein the light guiding slat is made of a band material equipped with a Fresnel reflector made by folding and/or bending the band material whereby the light guiding slat has a total height (G) which is so small that the light guiding slat has a form to be coilable with a coiling radius of 1 m or less without any substantial plastic deformation.