Textile Light Deflecting System with Non-Circular Weft Threads
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Solution Overview
Problem
Existing light control systems for sunlight in buildings are inadequate in providing targeted control over light incidence, leading to issues with glare, heat input, and inefficient use of natural light.
Innovation Solution
A textile fabric with varying diameter weft threads arranged in groups, forming a two-layer structure with a light-guiding surface that can reflect or absorb light, allowing for angle-selective reflection and transmission to control sunlight incidence, and integrated with a reflective or transmissive coating for optimal shading and illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If narrow longitudinal boundaries are used to keep out unwanted radiation and precipitation, then protection effectiveness is improved, but light is also reflected into the shielded area causing glare and heat input
Solution Approach 1:
The patent applies local quality by differentiating the optical properties of different parts of the fabric structure. The weave pattern creates regions with different thread orientations and densities, where some areas reflect light while others transmit it, allowing simultaneous protection and glare reduction through spatially differentiated optical characteristics
Solution Approach 2:
The patent uses composite materials by combining threads with different optical properties in a woven structure. The interplay between light-reflecting and light-transmitting threads creates a composite optical system that manages both protection and glare control through the integrated behavior of heterogeneous material components
2Object-affected harmful factors
If the fabric provides effective shading to avoid glare and heat input, then comfort is improved, but transparency and natural light utilization deteriorate
Solution Approach 1:
The fabric employs local quality by creating zones with different optical densities and thread configurations. Certain areas of the weave pattern are optimized for light reflection and shading, while adjacent areas maintain higher transparency, allowing the fabric to simultaneously provide glare reduction and natural illumination through spatially varying optical properties
Solution Approach 2:
The patent applies segmentation by dividing the fabric's optical function into distinct weave pattern segments. The repeating units contain both light-blocking and light-transmitting elements, creating a segmented optical system where different portions perform different functions - some segments shade while others transmit, achieving both comfort and illumination
3Ease of manufacture
If the fabric structure is simplified for ease of manufacture, then production cost is reduced, but the ability to target light guidance and control incidence angles is limited
Solution Approach 1:
The patent applies periodic action through its repeating weave pattern units. The systematic repetition of standardized thread configurations with specific orientations and spacings creates predictable optical behavior at different incidence angles, allowing targeted light guidance through periodic structural modulation that can be manufactured using conventional weaving processes
Solution Approach 2:
The fabric utilizes parameter changes by varying thread diameter, orientation, and spacing within the weave pattern to control light guidance. These parametric variations are implemented within a standard weave structure, enabling targeted optical performance while maintaining compatibility with conventional manufacturing methods through controlled adjustments of geometric parameters
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 manages sunlight incidence, reducing glare and heat while providing adjustable light guidance to enhance interior brightness, enabling seasonally adjusted solar radiation use without artificial lighting.
Implementation Method 1
the light directing surface forms a translucent surface, with the weft threads being transparent, so that the light is directed away from the light incidence side and thus into the room to be illuminated
Implementation Method 2
A further improvement in shading while at the same time providing good transparency is achieved by providing the weft threads with a light-reflecting or absorbing coating and/or by coloring them dark
Data Source
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AI summary
The invention relates to a light-directing system, comprising a textile sheet material (12), which can be positioned in a light incidence region in front of a space (14) and has a weft-thread layer (26) composed of a plurality of weft threads (20), wherein the weft threads (20) are extended substantially linearly and bound mesh openings (24) of the sheet material (12). According to the invention, some or all weft threads (20) have a non-circular thread cross-section bounded by a plurality of individual side parts (32) and are arranged parallel to each other, the orientation of the side parts (32) of said weft threads being uniform.