LED Lens with Concave-Convex Incident Surface for Streetlamp Light Extraction
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Solution Overview
Problem
Streetlamps using light emitting diodes face challenges in efficiently directing light due to light being trapped by the flange of the lens, leading to reduced light intensity and uneven illumination patterns.
Innovation Solution
A light emitting module design that refracts light emitted through the side surface of the light emitting diode chip in an upper direction, using a lens with a concave and convex light incident surface to minimize light entry into the flange, thereby enhancing light intensity and directional control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional lens structure with a flange is used, then the lens can be easily manufactured and assembled, but light emitted from the light emitting diode chip is trapped by the flange, reducing light intensity and directional control
Solution Approach 1:
The lens light incident surface is divided into multiple regions: a first region with a first incident angle range and a second region with a second incident angle range. This segmentation allows different portions of the light emitting diode chip to be directed toward different regions, preventing light trapping by the flange and improving light intensity and directional control.
2Ease of operation
If the lens is designed to direct light in a particular direction, then asymmetric illumination can be achieved, but light may be trapped by the flange, leading to uneven illumination patterns
Solution Approach 1:
Different regions of the lens light incident surface are assigned different incident angle ranges tailored to specific light emitting diode chip regions. This local optimization ensures that light from each chip region is directed appropriately, achieving both directional control and uniform illumination by preventing light trapping in specific areas.
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 module effectively increases light intensity and improves directional light emission, reducing light loss and enhancing the illumination coverage area, particularly in streetlamp applications.
Implementation Method 1
a light emitting module has an effect of increasing intensity of light via a lens that can refract light emitted through a side surface of a light emitting diode chip in an upper direction of the lens
Implementation Method 2
A light emitting diode may be formed from an inorganic semiconductor device that emits light through recombination of electrons and holes
Data Source
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AI summary
A light emitting module includes a substrate, a light emitting diode chip, and a lens. The light emitting diode chip is disposed on the substrate. The lens is coupled to the substrate and covers the light emitting diode chip. The lens includes a light incident surface and a light exit surface. The light incident surface receives light from the light emitting diode chip. The light exit surface outputs the light from the lens. The light incident surface includes a concave light incident surface and a convex light incident surface. The concave light incident surface overlaps the light emitting diode. The convex light incident surface extends from the concave light incident surface.