Optical Waveguide for Luminaire Light Distribution
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Solution Overview
Problem
Existing outdoor luminaires for parking lots and structures face challenges in efficiently distributing light over large areas while minimizing glare and maintaining aesthetic appeal, with current LED-based systems suffering from low efficiency due to losses in coupling light from Lambertian sources into waveguides.
Innovation Solution
The luminaire design incorporates elongate optical waveguides with refractive and reflective portions, tapered in one direction and constant in another, featuring varying light extraction features to control light distribution and extraction, enhancing light transfer efficiency and minimizing glare.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If LED-based luminaires use waveguides to distribute light over large areas, then illumination coverage is improved, but light coupling efficiency deteriorates due to losses from Lambertian sources
Solution Approach 1:
The waveguide is divided into multiple segments with different optical properties along its length. The first portion has optical features optimized for coupling light from Lambertian LED sources, while the second portion has different optical features optimized for light extraction and distribution. This segmentation allows each portion to specialize in its function, improving overall system efficiency while maintaining large area coverage.
Solution Approach 2:
Different portions of the waveguide are given different local optical qualities. The first portion contains coupling-optimized features such as specific refractive index profiles or surface structures, while the second portion contains extraction-optimized features. This local differentiation enables the waveguide to efficiently perform both light coupling and distribution functions simultaneously, resolving the contradiction between coverage area and coupling efficiency.
2Illumination intensity
If luminaires are designed to illuminate large parking lot areas, then illumination intensity is improved, but glare increases which distracts drivers
Solution Approach 1:
The waveguide enables dynamic control of light extraction along its length through varying optical features. By adjusting the extraction characteristics at different positions, the system can distribute illumination intensity smoothly across the parking lot area rather than creating concentrated bright spots. This dynamic distribution maintains adequate illumination levels while preventing excessive glare that would distract drivers.
Solution Approach 2:
The waveguide acts as an intermediary between the LED light sources and the parking lot area. It receives light from the LEDs and progressively extracts it along its length, transforming the light distribution pattern. This intermediary function allows the system to achieve broad area illumination with controlled intensity levels, preventing direct glare while maintaining sufficient illumination for safe vehicle travel.
3Shape
If luminaires present a uniform appearance for aesthetic appeal, then aesthetic quality is improved, but adaptability to different mounting locations deteriorates
Solution Approach 1:
The waveguide structure serves multiple functions simultaneously: it provides the primary aesthetic visual element, acts as the light distribution medium, and enables adaptation to various mounting configurations. The elongated waveguide can be oriented horizontally or vertically, and its optical features can be adjusted to suit different mounting locations while maintaining a consistent uniform appearance. This multi-functionality resolves the contradiction between aesthetic uniformity and mounting versatility.
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 design achieves efficient light distribution with reduced glare and improved aesthetic appeal by effectively directing and extracting light from LEDs, resulting in a more robust and cost-effective lighting solution for large areas.
Implementation Method 1
The optical component includes a refractive portion disposed between the first and second sides
Implementation Method 2
The optical component includes a plurality of separate reflective portions
Implementation Method 3
exhibits a total internal reflection characteristic
Data Source
AI summary
An optical component has an elongate length extending between first and second ends and a width transverse to and substantially smaller than the length and extending between first and second sides. The optical component includes a refractive portion disposed between the first and second sides and extending along the length between the first and second ends, and a plurality of separate reflective portions. At least one of the plurality of separate reflective portions is spaced from the refractive portion and extending along the length between the first and second ends.