LED Lens Bulge Enhancing Radiant Intensity
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Solution Overview
Problem
Existing light emitting devices face a challenge in enhancing radiant intensity in a single direction due to limitations in the design of their cavities, which restrict the lateral reflection surface, thereby failing to meet the demand for increased light emission intensity.
Innovation Solution
A light emitting device is designed with a substrate and a lens where the LED chip is exposed in a gap between the substrate and the lens, with the lens having a light output surface that bulges towards the LED chip and a light incident surface spaced apart to receive light, enhancing light transmission and reducing light spread.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the depth of the cavity is increased to enhance radiant intensity, then the light transmission in the thickness direction is improved, but the lateral reflection surface area is reduced due to cavity depth limitations
Solution Approach 1:
The invention transitions from a traditional cavity structure to a lens-based optical system. The lens introduces a new dimensional approach by utilizing refraction and focal points to concentrate light in the thickness direction, replacing the reliance on lateral reflection surfaces with optical focusing mechanisms that operate in a different spatial dimension.
Solution Approach 2:
The invention changes the optical parameters by introducing a lens with specific refractive properties. The lens focuses light through parameter optimization of its curvature and material properties, enabling enhanced radiant intensity without being constrained by cavity depth or lateral surface area limitations.
2Illumination intensity
If the cavity depth is increased to improve light emission intensity, then the light transmission is enhanced, but the structural complexity and manufacturing difficulty increase
Solution Approach 1:
The invention extracts the light-focusing function from the cavity structure itself and separates it into a dedicated lens component. This extraction simplifies the cavity design while concentrating the optical enhancement function in the lens, reducing overall structural complexity and manufacturing difficulty.
Solution Approach 2:
The invention segments the optical system into distinct functional components: the substrate with LED, the bonding layer, and the lens. This segmentation allows each component to be optimized and manufactured independently, reducing complexity compared to a monolithic deep-cavity structure.
3Illumination intensity
If the lens is positioned closer to the LED chip to reduce light spread, then the radiant intensity is enhanced, but stress on the LED chip increases
Solution Approach 1:
The bonding layer serves as an intermediary between the lens and the LED chip. It provides mechanical support and stress distribution, allowing the lens to be positioned optimally for light focusing while preventing excessive stress concentration on the fragile LED chip through the cushioning and load-distributing properties of the bonding material.
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 enhances radiant intensity in the desired direction while reducing light spread and minimizing stress on the LED chip, preventing damage and improving the device's ability to accurately sense targets.
Implementation Method 1
a lens (3) bonded to the front surface (141) of the substrate (1), wherein the lens (3) has a light output surface (511) which bulges in a direction (Za) that is defined from the substrate (1) toward the LED chip (6) and is contained in a thickness direction (Z) of the substrate (1) to transmit the light emitted from the LED chip (6)
Data Source
AI summary
The present invention provides a light emitting device which is capable of enhancing the radiant intensity on a single direction. The light emitting device comprises a substrate, a lens bonded to the substrate, and an LED chip bonded to the substrate and exposed in a gap clipped between the substrate and the lens, wherein the lens has a light output surface which bulges in a direction that is defined from the substrate toward the LED chip and is contained in a thickness direction of the substrate to transmit the light emitted from the LED chip.