LED Street Light Lens Rectangular Beam Design
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Solution Overview
Problem
Conventional light sources emit light in all directions, leading to inefficiencies and uneven illumination of target areas, particularly in applications requiring directional light patterns, such as street lighting, where much light is wasted and not utilized effectively.
Innovation Solution
A lens assembly comprising dioptric and catadioptric surfaces that refract and reflect light to produce a substantially rectangular light output, combined with a reflector to achieve asymmetrical beam patterns, minimizing back spill and optimizing light distribution for specific target areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional light source is used without any direction control devices, then the light source structure is simple, but the light is emitted in all directions causing light waste and uneven illumination of the target area
Solution Approach 1:
The patent introduces a lens as an intermediary optical element between the LED light source and the target area. The lens includes multiple surfaces (first surface, second surface, third surface, and fourth surface) that act as mediators to refract and direct light rays, converting the omnidirectional light emission into a controlled rectangular beam pattern that illuminates the target area efficiently while minimizing light waste.
Solution Approach 2:
The patent changes the optical parameters of light propagation by using a lens with specifically designed surface curvatures and refractive indices. The lens modifies the direction, convergence, and distribution parameters of light rays, transforming the light emission pattern from spherical (360 degrees) to a controlled rectangular beam pattern, thereby improving light utilization efficiency.
2Illumination intensity
If a light source without direction control is used, then the device complexity is low, but the illumination uniformity of the target area is poor
Solution Approach 1:
The lens serves as an intermediary optical system that uniformly distributes light across the target area. The multiple surfaces of the lens (first, second, third, and fourth surfaces) work together to refract light rays and eliminate hot spots, achieving uniform illumination intensity across the rectangular beam pattern while maintaining a relatively simple overall device structure.
Solution Approach 2:
The patent applies local quality by designing different surface characteristics in different regions of the lens. Each surface (first, second, third, fourth) has specific curvature and refractive properties tailored to control light rays in particular directions, ensuring uniform illumination distribution across the target area while maintaining structural efficiency.
3Productivity
If a lens with multiple dioptric and catadioptric surfaces is used to control light direction, then light distribution efficiency is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent combines multiple optical functions into a single integrated lens structure. The lens integrates dioptric surfaces (first and second surfaces) and catadioptric surfaces (third and fourth surfaces) into one monolithic component, achieving complex light control functions while simplifying manufacturing compared to using separate optical elements. This merging approach improves light distribution efficiency while maintaining ease of manufacture.
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 efficiently directs light to desired areas, achieving uniform illuminance and reducing light waste, suitable for applications like street lighting, general area lighting, and corridor lighting by converting circular light outputs into asymmetrical rectangular patterns.
Implementation Method 1
a first surface and a second surface that are dioptric, a first surface and a third surface that are dioptric, and a first surface and a fourth surface that are catadioptric
Implementation Method 2
a first surface and a fourth surface that are catadioptric
Data Source
AI summary
The present invention is directed to a lens. In one embodiment, the lens includes a first surface, a second surface that bends a light emitted from a light source with the first surface, a third surface that bends the light emitted from the light source with the first surface and a fourth surface coupled to the second surface and the third surface that bends the light emitted from the light source with the first surface. The first surface and the second surface are dioptric. The first surface and the third surface are dioptric. The first surface and the fourth surface are catadioptric.