Anisotropic Optical Lens for Uniform LED Illumination
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Solution Overview
Problem
Existing light emitting diode (LED) systems face challenges in achieving uniform and symmetric light diffusion, leading to luminance unevenness and interference between optical lenses, which affects the reliability and performance of light emitting modules.
Innovation Solution
An optical lens with a specific anisotropic design featuring a reflective pattern, rough regions, and a flange portion is used, providing wider light diffusion in one axis direction while minimizing interference and luminance unevenness by altering the light exit surface and incident surface geometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional symmetric optical lens is used, then the structure is simple and easy to manufacture, but the light diffusion distribution is not uniform and luminance unevenness occurs
Solution Approach 1:
The patent applies asymmetry by designing an anisotropic optical lens with different dimensional characteristics in different directions. The lens has a first axis direction and a second axis direction perpendicular to it, where the light diffusion distribution intentionally differs between these two directions. This asymmetric design resolves the luminance unevenness problem by matching the light diffusion pattern to the specific application requirements, achieving uniform luminance distribution across the illumination area.
Solution Approach 2:
The patent implements local quality by creating different surface characteristics in different regions of the optical lens. Specifically, it includes a first rough region around the recess with a first surface roughness, and second and third rough regions with a second surface roughness that is greater than the first. This localized variation in surface roughness optimizes light diffusion in specific areas while maintaining overall performance.
2Area of stationary object
If LEDs are arranged in a compact configuration, then the device size is reduced, but interference between adjacent optical lenses increases
Solution Approach 1:
The anisotropic optical lens design creates an asymmetric light diffusion pattern that extends further in the first axis direction than in the second axis direction. This directional light distribution reduces optical interference between adjacent lenses arranged in arrays, as the light beams are more narrowly confined in one direction while providing adequate coverage in the other direction, enabling closer spacing without interference.
3Manufacturing precision
If the light exit surface is enlarged to improve light diffusion, then the luminance distribution improves, but the interference between adjacent lenses increases
Solution Approach 1:
The patent resolves this contradiction by creating an asymmetric light diffusion pattern where the effective light exit area is optimized differently in different directions. The lens provides extended light diffusion in the first axis direction while maintaining tighter confinement in the second axis direction, achieving good luminance distribution without excessive interference with adjacent lenses.
Solution Approach 2:
The patent applies local quality through differentiated surface roughness in different regions. The first rough region around the recess has a lower surface roughness compared to the second and third rough regions, which have higher surface roughness. This localized control of light scattering properties optimizes the balance between light diffusion and interference reduction.
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 enhances luminance distribution uniformity, reduces noise and hot spots, and improves the reliability of light emitting modules by minimizing interference between adjacent optical lenses, resulting in a more efficient and uniform light distribution.
Implementation Method 1
a first rough region around the recess, and second and third rough regions around the first rough region
Implementation Method 2
the bottom surface includes a first reflective pattern adjacent to the flange portion rather than the recess
Data Source
AI summary
The invention discloses an optical lens and a light emitting module having the same. The optical lens includes an incident surface around a recess in a center of the bottom surface; a light exit surface for emitting light incident; and a flange portion disposed between the light exit surface and a second edge of the bottom surface. A bottom of the recess has a width in a first axis direction that is greater than a width in a second axis direction orthogonal to the first axis direction. An outer diameter of the bottom surface has a length in the first axis direction that is smaller than a length in the second axis direction. The bottom surface includes a first rough region around the recess and second and third rough regions around the first rough region.