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 product volume and aligning the LED with the reflecting structure, as the paraboloid reflecting structure with a single focal point is insufficient for concentrating light effectively due to the LED's nature as a plane or body light source rather than a point light source.
Innovation Solution
A light emitting device featuring a light emitting chip with a multifocal paraboloid reflecting cup, where the inner surface of the cup is made of a specular reflective material and includes multiple stages of paraboloids with symmetrically distributed focal points on the chip's surface, allowing for more concentrated light emission by reducing the length of the reflecting cup and improving focusing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a paraboloid reflecting structure with a single focal point is used, then the light emitting angle can be reduced, but the condenser capacity is limited because the LED is a plane or body light source rather than a point light source
Solution Approach 1:
The patent divides the single focal point into multiple focal points arranged in an array. The reflecting cup contains multiple paraboloid surfaces, each with its own focal point, collectively forming a focal point array that matches the LED chip's light emitting surface, thereby improving light concentration effectiveness
Solution Approach 2:
Different regions of the reflecting cup are designed with different paraboloid geometries tailored to specific local requirements. Each paraboloid segment is optimized for its particular position and function, with focal lengths and orientations adjusted to collectively achieve uniform light distribution across the entire LED chip surface
2Illumination 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 is enlarged
Solution Approach 1:
The reflecting cup is integrated within the LED package structure, with the LED chip positioned at the focal point array of the reflecting cup. This nested arrangement allows the reflecting structure to be compact and closely coupled with the light source, minimizing the overall volume while maintaining effective light concentration
Solution Approach 2:
The patent transitions from a conventional single-direction reflecting structure to a three-dimensional focal point array configuration. By distributing focal points in multiple dimensions and orientations, the system achieves comprehensive light control in various directions, improving concentration efficiency without requiring excessive space
3Illumination intensity
If a reflecting structure is added to reduce the light exiting angle, then the light concentration is improved, but it is difficult to align the light emitting diode with the reflecting structure during assembly
Solution Approach 1:
The LED chip itself serves as the alignment reference for the reflecting cup structure. The chip's physical dimensions and light emitting surface are directly used to determine the position and orientation of the focal point array, eliminating the need for separate alignment procedures and enabling self-aligned assembly
Solution Approach 2:
The LED chip performs multiple functions: it is both the light source and the alignment reference for the reflecting cup. By using the chip's own geometric features as the basis for positioning the focal point array, the system eliminates the need for additional alignment fixtures or procedures
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 device achieves a more concentrated light output with a reduced light exiting angle, enhancing light-emitting efficiency and allowing for better alignment and reduced product volume, making it suitable for applications like high beam lamps.
Implementation Method 1
The inner surface of the reflecting cup is a multifocal paraboloid... made of a specular reflective material... corresponding focus points of the multistage paraboloids are symmetrically distributed on the first light emitting surface
Data Source
AI summary
A light emitting device includes a light emitting chip, a reflecting cup arranged on a side of the light emitting chip, and a package encapsulating the light emitting chip and the reflecting cup. The light emitting chip includes a first light emitting surface and a second light emitting surface coupled to the first light emitting surface. The reflecting cup has an inner surface facing the second light emitting surface of the light emitting chip. The reflecting cup arranges around a periphery of the second light emitting surface. The inner surface of the reflecting cup is a multifocal paraboloid. The multifocal paraboloid includes multistage paraboloids. The corresponding focus points of the multistage paraboloids are symmetrically distributed on the first light emitting surface of the light emitting chip.