Asymmetric LED Light Guide for Street Lighting
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Solution Overview
Problem
Existing LED lighting devices are limited in their ability to provide uniform illumination for complex lighting tasks, as they are primarily designed for simple surfaces and lack the flexibility to adjust light distribution effectively for more intricate applications.
Innovation Solution
The development of an LED lighting device featuring a light-guiding body with asymmetric light distribution, utilizing a light guide formed from transparent materials like glass or plastic, which deflects light through refraction and/or reflection to create a main peak and secondary maximum, allowing for adjustable illumination patterns by rotating the device along its main emission axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional symmetric LED lighting devices are used, then the structure is simple and manufacturing is easy, but the light distribution is uniform only for simple surfaces and cannot handle complex lighting tasks
Solution Approach 1:
The patent applies asymmetry by designing a lens with asymmetric curved input and output surfaces that deflect light asymmetrically with respect to the main emission direction of the LED. This asymmetric optical design enables the device to handle complex lighting tasks and illuminate curved surfaces uniformly, resolving the contradiction between adaptability and complexity by introducing controlled asymmetry in the optical path.
Solution Approach 2:
The patent implements dynamics by making the LED illumination device rotatable about the main emission direction axis, allowing the main peak of the light distribution curve to be individually adjusted and oriented in different directions. This dynamic positioning capability enables the same device to adapt to various complex lighting tasks, achieving versatility without requiring multiple different device designs.
2Adaptability or versatility
If multiple LED lighting devices are deployed to handle complex lighting tasks, then the lighting coverage is improved, but the system complexity and installation requirements increase
Solution Approach 1:
The patent achieves universality by designing a single LED lighting device with asymmetric optical characteristics that can perform multiple lighting functions. The device can illuminate curved surfaces, handle complex geometric lighting tasks, and provide adjustable directional lighting all through one integrated design, eliminating the need to deploy multiple specialized devices and simplifying installation while maintaining comprehensive lighting coverage.
3Illumination intensity
If the main peak is positioned at 0° relative to the main emission direction, then the light distribution is symmetric, but the uniformity of illumination on complex surfaces is reduced
Solution Approach 1:
The patent resolves this contradiction by positioning the main peak asymmetrically at angles between 45° and 80° relative to the main emission direction, rather than at 0°. This asymmetric positioning, combined with the asymmetric lens design, creates a light distribution pattern that achieves uniform illumination on complex and curved surfaces while maintaining controlled intensity distribution, thereby improving illumination uniformity without sacrificing intensity control.
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
This solution enables the LED lighting device to provide individually adjustable luminance and accent lighting, improving uniformity and flexibility in lighting tasks such as street lighting by aligning the main peak with the road and using the secondary maximum to illuminate surrounding areas, regardless of the main peak's orientation.
Implementation Method 1
The light direction in the light guiding body is carried out by refraction and / or reflection
Implementation Method 2
The light direction in the light guiding body is carried out by refraction and / or reflection
Implementation Method 3
In the full light guide in particular total reflection on selected interfaces is possible
Data Source
AI summary
The invention relates to an LED lighting device comprising at least one LED (1) with a main emission direction in the light output of the LED (1) and a light-guiding body (3) formed from a light guide and having at least one light-exiting surface (12, 14, 18), wherein light from the LED (1) is coupled into the light-guiding body (3) and the light-guiding body (3) deflects at least a portion of the light such that it exits the light-guiding body (3) through the light-exiting surface (12, 14, 18) with a light distribution that is asymmetrical with respect to the main emission direction of the LED, characterized in that the light distribution in a cross-sectional plane in which the main emission direction of the LED (1) lies and which intersects the light-exiting surface (12, 14, 18) defines a light distribution curve that has a main maximum (13) and at least one secondary maximum, wherein the main maximum (13) is asymmetrical with respect to the main emission direction the LED (1) is located.