LED Lens with Dual Emitting Surfaces for Uniform Illumination
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Solution Overview
Problem
Traditional lighting systems, such as halogen and incandescent, suffer from high power consumption and inefficiencies in light dispersion, leading to non-uniform illumination, while early LED systems were limited to small areas due to light attenuation issues with distance, necessitating improved optical designs for applications requiring uniform illumination.
Innovation Solution
The illumination system incorporates an LED module with a lens featuring an optical axis, light source recess, and multiple light emitting surfaces with convex lenses, allowing for controlled beam width and intensity distribution to achieve uniform illumination across larger areas by varying the radius, height, and lateral dimensions of the lenses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If traditional incandescent or fluorescence lighting apparatus are used, then illumination coverage is achieved, but power consumption is high and light dispersion efficiency is poor
Solution Approach 1:
The patent changes the light source parameter from traditional incandescent/fluorescence to LED, which fundamentally alters the energy conversion efficiency and reduces power consumption while improving light dispersion characteristics
Solution Approach 2:
The patent replaces the traditional metal shield mechanical structure with an optical lens system that uses refraction and reflection principles to achieve superior light dispersion and uniformity without the drawbacks of metal shield blocking
2Area of stationary object
If LED light module illuminates large area, then illumination coverage is improved, but light intensity becomes non-uniform due to attenuation with distance
Solution Approach 1:
The patent divides the single LED light source into multiple LED units arranged in an array, with each unit having its own optical lens. This segmentation allows independent control and optimization of light distribution zones, achieving uniform illumination across large areas by combining multiple controlled zones
Solution Approach 2:
The patent introduces optical lenses as intermediary elements between the LED light sources and the illuminated area. These lenses actively shape and distribute light rays to compensate for natural attenuation, ensuring uniform intensity across the entire illumination area regardless of distance variations
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 configuration ensures that illumination patterns closer and farther from the LED module have similar luminance, providing a nearly uniform illumination experience, effectively addressing the limitations of traditional systems and enhancing the quality of displayed products in applications like exhibition halls and showcases.
Implementation Method 1
a lens having an optical axis, a light source recess for disposing a light source, a first light emitting surface, a second light emitting surface, a critical reflection surface formed between the light source recess and the first and second light emitting surfaces, and a transitional surface formed between the critical reflection surface and the first and second light emitting surfaces
Implementation Method 2
a critical reflection surface formed between the light source recess and the first and second light emitting surfaces
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
An illumination system includes at least an LED module, and at least an illuminated area. The LED module includes an LED, and a lens mounted in light path of the LED. The lens includes a light source recess, a first light emitting surface, a critical reflecting surface, and a second light emitting surface intersecting with the first light emitting surface and being on same side with the first light emitting surface. The first light emitting surface can receive more light quantity than the second light emitting surface. Although the light emitted from the first light emitting surface may have greater attenuation than the light emitted from the second light emitting surface, light emitted from the first light emitting surface can make up the intensity losses of attenuation as the first light emitting surface receives more light quantity than the second light emitting surface. As a result, the illumination system 100 have uniform illumination pattern.