LED Lens with Cavity Hole for Uniform Illumination
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Solution Overview
Problem
Conventional light source designs using LEDs suffer from non-smooth light distribution, resulting in ring-shaped areas of strong light and heat dissipation issues due to the complete coverage of the light-emitting diode chip within a cavity.
Innovation Solution
A light source device with a lens featuring a concave bottom surface and a hole above it, allowing light to be emitted directly into the hole, reducing total reflection and enhancing smoothness, while a honeycomb arrangement of these devices improves light distribution and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the light-emitting diode chip is completely covered within the cavity formed by the lens, then the lens structure is simple and easy to manufacture, but heat dissipation problems occur
Solution Approach 1:
The cavity is segmented into an upper cavity and a lower cavity by a partition wall. The light-emitting diode chip is disposed in the lower cavity while the upper cavity remains open for heat dissipation. This segmentation allows the lens structure to maintain manufacturing simplicity while enabling effective heat dissipation pathways.
2Area of stationary object
If the lens outer surface is designed to emit light at a larger angle, then the light-emitting area is increased, but ring shaped areas of strong light are formed and light smoothness deteriorates
Solution Approach 1:
The inner surface of the lens is designed with different local qualities: the upper portion has a first refractive index and the lower portion has a second refractive index. This local differentiation allows light to be emitted at larger angles through the upper portion while the lower portion with different refractive index prevents ring-shaped strong light areas, thereby maintaining both large light-emitting area and light smoothness.
3Reliability
If the light-emitting diode chip is completely covered within the cavity, then the lens provides complete coverage, but total reflection occurs and light smoothness decreases
Solution Approach 1:
Instead of completely enclosing the light-emitting diode chip within a closed cavity, the design inverts the approach by leaving the upper cavity open. The partition wall provides coverage where needed while the open upper cavity prevents total reflection, thereby maintaining light coverage reliability while improving light smoothness.
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 design achieves improved light smoothness by minimizing dark spots and ring formations, along with enhanced heat dissipation through the air layer between the light source and the lens, resulting in a more uniform and efficient illumination.
Implementation Method 1
the light emitting from the illumination area may be completely or substantially emitted into the hole through the opening. Through this design, light emitted from the inner top surface may pass through the inner top surface and be emitted out to the projection area corresponding to the light-emitting top surface. This improves light smoothness by decreasing the chances of total reflection.
Data Source
AI summary
A light source device and a light source system using the same are provided. The light source device includes a lens and a light source disposed under the lens. The lens has a light-emitting top surface and a bottom surface having a hole that is surrounded by an inner wall surface and an inner top surface. The inner top surface and a projection area of thereof onto the light-emitting top surface are flat surfaces. The light source has an illumination area, wherein an opening of the hole covers a projection area of the illumination area onto the bottom surface. The light source system includes a plurality of the light source device disposed in a honeycomb arrangement, wherein the light source devices are spaced apart from each other.