Linear Sub-Refractive Optical Element for LED Light Spot Control
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Solution Overview
Problem
Conventional optical lens designs with curved surfaces cause a yellow halo phenomenon and result in small light spots, failing to meet the requirements for varying optical characteristics of light emitted by LED packages.
Innovation Solution
An optical element with a total reflection surface and linear sub-refractive surfaces at the light exit surfaces, which are designed to control the slope and length of the linear sub-refractive surfaces to eliminate the halo phenomenon and increase the size of the light spot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional curved surfaces are used for light exit surfaces, then light can be controlled to some extent, but a yellow halo phenomenon is formed and the light spot size is reduced
Solution Approach 1:
The light exit surface is segmented into multiple linear sub-refractive surfaces (first, second, third linear sub-refractive surfaces) with different slopes and angles. This segmentation allows each surface to control light in specific directions, expanding the light spot while preventing the concentration of wavelengths that causes yellow halo effect.
Solution Approach 2:
The patent employs asymmetric linear sub-refractive surfaces with different slopes and angles relative to the central axis. The first linear sub-refractive surface has a first slope, the second has a second slope, and the third has a third angle, creating asymmetric light distribution that expands the illumination area without forming symmetric halo patterns.
2Area of stationary object
If curved surfaces are used in optical lens, then light refraction is achieved, but the light spot size is limited and illumination profile is restricted
Solution Approach 1:
Each linear sub-refractive surface is designed with specific local properties (different slopes, angles, and positions) to control light in different regions. The first linear sub-refractive surface controls light from the first light guide layer, the second from the second light guide layer, and the third from the third light guide layer, creating a customized illumination profile that adapts to various application requirements.
Solution Approach 2:
The patent transitions from conventional two-dimensional curved surface control to three-dimensional linear sub-refractive surface control with multiple slopes and angles. This dimensional approach allows light to be redirected in multiple spatial dimensions, significantly expanding the light spot area and providing versatile illumination patterns.
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 optical element effectively reduces the yellow halo issue and increases the size of the light spot, providing an improved illumination profile with enhanced luminance and reduced halo effect compared to conventional curved surface lenses.
Implementation Method 1
the optical lens can be a reflection lens. Light emitted by the LED package can be reflected by a total reflection surface of the reflection lens
Implementation Method 2
the first light exit surface and a second light exit surface. Each of the first light exit surface and the second light exit surface is consisted of at least one linear sub-refractive surface
Data Source
AI summary
An optical element includes a bottom surface, a total reflection surface above the bottom surface, a recess recessed from the bottom surface toward the total reflection surface and first and second light exit surfaces. The optical element has a central axis perpendicular to the bottom surface. The total reflection surface has a peripheral boundary away from the central axis. The first light exit surface is connected to the peripheral boundary of the total reflection surface and extends toward the bottom surface away from the central axis. The second light exit surface is connected to the first light exit surface, extends away from the central axis, and is connected to the bottom surface. Each of the first and second light exit surfaces is consisted of at least one linear sub-refractive surface. Each linear sub-refractive surface is a straight line in any cross section passing through the central axis.