Multifocal Paraboloid Reflecting Cup for LED Light Concentration
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Solution Overview
Problem
Conventional light emitting diode (LED) products face challenges in reducing the light exiting angle without increasing the device volume and aligning the LED with reflecting structures, as they typically use a single focal point paraboloid which is inadequate for concentrating light effectively due to the LED being a plane or body light source rather than a point source.
Innovation Solution
A light emitting device with a side-emitting assembly featuring a wavelength conversion layer, a reflecting layer, and a multifocal paraboloid reflecting cup, where the focal points of the multistage paraboloids are symmetrically distributed to concentrate light, reducing the required length of the reflecting cup and enhancing light concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflecting structure is added to reduce the light exiting angle, then the light concentration is improved, but the total volume of the light emitting diode product increases
Solution Approach 1:
The reflecting cup is integrated into the package cavity, nesting the reflecting function within the existing package structure rather than adding a separate external reflecting component. This reduces the overall volume while maintaining the light concentration effect
Solution Approach 2:
The patent transitions from conventional point-source reflecting structures to a multifocal paraboloid design that accommodates the extended light source geometry, effectively solving the light concentration problem in a different dimensional approach that reduces volume requirements
2Device complexity
If a conventional single focal point paraboloid reflecting structure is used, then the structure is simple, but the light emitting angle cannot be well narrowed because the LED is a plane or body light source
Solution Approach 1:
The reflecting cup's inner surface is divided into multiple paraboloid sections, each with its own focal point. This segmentation allows each section to handle light from different regions of the LED chip, achieving better overall light concentration while maintaining manageable structural complexity
Solution Approach 2:
Different regions of the reflecting cup inner surface have different curvatures and focal points optimized for their specific local light source regions. This local optimization ensures effective light concentration across the entire LED chip surface rather than treating it as a single point
3Volume of stationary object
If the reflecting structure is arranged around the periphery of the light emitting diode, then the volume is reduced, but the alignment between the light emitting diode and the reflecting structure becomes difficult
Solution Approach 1:
The reflecting cup and package are merged into a single integrated component, eliminating the need for separate alignment of the reflecting structure with the LED chip. The reflecting cup is formed as part of the package molding process, making alignment automatic and simplifying manufacturing
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 achieves a more concentrated light emission with a reduced light exiting angle, allowing for a thinner LED product design and improved alignment, resulting in a more efficient and compact light emitting device.
Implementation Method 1
The reflecting cup includes an inner surface facing the side surface of the side-emitting assembly. The inner surface of the reflector cup includes a multifocal paraboloid.
Implementation Method 2
A light emitting device with a side-emitting assembly featuring a wavelength conversion layer
Data Source
AI summary
A light emitting device includes a side-emitting assembly, a reflecting cup arranged on a side of the side-emitting assembly, and a package for accommodating the side-emitting assembly and the reflecting cup. The side-emitting assembly with a side surface includes a light emitting chip, a wavelength conversion layer coated on the light emitting chip, and a reflecting layer arranged above the wavelength conversion layer. The reflecting cup has an inner surface facing the side surface of the side-emitting assembly. The inner surface of the reflecting cup is a multifocal paraboloid. The multifocal paraboloid includes multistage paraboloids. The corresponding focal points of the multistage paraboloids are symmetrically distributed on the side surface of the side-emitting assembly.