Hermetic LED Lens Cooling via Fan-Driven Airflow
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Solution Overview
Problem
Small-sized wearable LED illumination apparatuses face challenges with heat buildup due to reduced surface area and hermetic sealing, leading to decreased optical output and shortened LED life, as well as difficulties in effective heat exchange and cooling within the compact lens casing.
Innovation Solution
The apparatus features a tubular lens casing with a concave base part and a fan device supported by protruding columns, where the fan takes in air and exhausts it through window parts, enhancing heat exchange through airflow and radiation, with heat being transmitted via screws and further enhanced by grooves and heat radiation coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lens casing is hermetically sealed to prevent dust and moisture ingress, then reliability is improved, but temperature inside the casing rises quickly leading to reduced LED performance and lifespan
Solution Approach 1:
The lens casing is divided into a light-shielding casing and a base part that serves as a heat dissipation structure. The base part includes protruding heat dissipation fins that extend outward, separating the light path function from the heat dissipation function. This segmentation allows the hermetic seal to protect against dust and moisture while the external fins provide thermal management.
Solution Approach 2:
The patent introduces an intermediary heat dissipation structure (the base part with fins) between the LED light source and the external environment. This intermediary structure conducts heat away from the sealed internal space through thermal conduction to the external fins, which then dissipate heat to the surrounding air, allowing hermetic sealing while managing temperature.
2Weight of moving object
If the lens casing volume is reduced to make the apparatus lightweight and compact, then portability is improved, but the surface area of the illumination part is reduced making it more susceptible to dirt and water droplet accumulation
Solution Approach 1:
The patent extends the heat dissipation function into a third dimension by adding protruding fins that extend outward from the base part. This dimensional extension increases the effective surface area for heat dissipation without significantly increasing the overall volume or weight of the apparatus, thereby maintaining portability while improving thermal management capability.
3Temperature
If fins are provided on the back surface of the substrate inside the hermetically sealed casing to dissipate heat, then heat dissipation is attempted, but effective heat exchange is difficult to achieve in the sealed space
Solution Approach 1:
The patent extracts the primary heat dissipation function from the internal sealed space by providing heat dissipation fins on the external base part. The fins are positioned outside the hermetic seal, allowing direct thermal exchange with the external environment. This extraction eliminates the heat exchange limitations of the sealed interior while maintaining the protective sealing.
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 effectively manages heat within the hermetically sealed casing, improving the durability and longevity of the LED illumination apparatus by enhancing heat radiation efficiency and preventing dust and moisture ingress.
Implementation Method 1
a fan device having a frame supported by the support columns, the fan device making taken-in air collide with the end face of the base part that faces away from the concave part and exhausting the air through the window parts
Implementation Method 2
heat radiation coatings
Data Source
AI summary
A lens casing in an LED illumination apparatus hermetically housing LED elements is cooled. The LED illumination apparatus includes a tubular lens casing, an LED holding part mounting the LED elements thereon, and a base part to which the lens casing is coupled. The base part has a concave part for housing the LED holding part, and the lens casing is coupled to the base part, thereby hermetically sealing the internal space of the lens casing. The base part has support columns protruding into a space outside the LED illumination apparatus and supporting a fan device. The fan device makes taken-in air collide with the base part and exhausts the air through the window parts each formed by adjacent support columns and the side of the frame of the fan device and the side of the base part that face each other as upper and lower frames thereof.