UV LED Light Source Unit Moisture-Proof Film Sealing
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Solution Overview
Problem
Ultraviolet ray emitting diodes (UV LEDs) used in high humidity or underwater environments face reliability issues due to deterioration of moisture-proof and waterproof functions, leading to decreased operational reliability.
Innovation Solution
A light source unit design featuring a moisture-proof film adhered to the light-emitting device and a substrate, surrounded by a resin member between two covers, which includes a fixing frame to enhance sealing and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UV LEDs are used in high humidity or underwater environments, then the light-emitting function is achieved, but the moisture-proof and waterproof functions deteriorate leading to decreased reliability
Solution Approach 1:
The patent implements a nested waterproof structure where the transparent adhesive layer is positioned between the light-emitting chip and the first substrate, the first waterproof layer is formed on the first substrate, and the second waterproof layer is formed on the second substrate. This multi-layer nested configuration creates progressive barriers against moisture and water penetration, protecting the UV LED from harmful environmental factors while maintaining operational reliability
Solution Approach 2:
The patent employs composite material structures combining different waterproof layers (first waterproof layer, second waterproof layer, transparent adhesive layer) with distinct functional properties. Each layer is made of specific materials selected for their moisture-resistant characteristics, creating a composite barrier system that effectively prevents water and humidity damage to the UV LED while preserving light transmission and electrical functionality
2Reliability
If multiple waterproof layers are added to protect UV LEDs, then moisture-proof function is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple waterproofing functions into an integrated multi-layer structure where the transparent adhesive layer serves both as an adhesive bonding layer and a waterproof barrier. The first and second waterproof layers are formed as integral parts of the substrate assembly process, combining sealing, protection, and structural functions into a unified design that prevents moisture ingress without requiring separate complex waterproofing components
Solution Approach 2:
The patent utilizes thin film structures for the waterproof layers and transparent adhesive layer, which provide effective moisture barriers through their continuous coverage and material properties. These thin films are deposited or applied as uniform layers across the substrate surfaces, creating flexible yet effective waterproof seals that protect the UV LED while maintaining a relatively simple and compact device structure
Data Source
AI summary
A light source unit disclosed in an embodiment includes a first cover which has an open region; a second cover which is coupled to the first cover; a light source module which is disposed between the first cover and the second cover, and has a light-emitting device disposed on the open region and a circuit board on which the light-emitting device is disposed; a fixing frame which is disposed between the second cover and the circuit board; and a resin member which is filled in an region between the first cover and the second cover and supports the light source module and the fixing frame. The light source module includes a moisture-proof film which covers an upper surface and side surfaces of the light-emitting device and extends to an upper surface of the circuit board.