End Cap Recess Design for LED Lighting Sealing
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Solution Overview
Problem
Existing lighting devices for outdoor use, such as LED linear light sources, face challenges in achieving effective sealing without color differences and bubbles on the surface, and require numerous assembly steps to meet IP protection standards.
Innovation Solution
A lighting device design featuring a cover with a circuit board and an end cap that includes a recess for adhesive sealant, allowing for simplified assembly and improved sealing, where the end cap is made from elastomer materials and integrated with a power line and electrical contact pin for enhanced sealing and reduced steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If glue is used to seal the end cap first and then potting material is potted directly at the LED, then the lighting device can be encapsulated, but color difference and bubbles appear on the LED surface
Solution Approach 1:
The end cap is divided into two portions: a first portion that closely mounts into the cover and a second portion at the outside of the cover configured to form a recess. This segmentation allows the adhesive sealant to be contained in the recess while potting material is applied to the cover, preventing direct contact between the two materials and eliminating bubbles and color differences on the LED surface.
Solution Approach 2:
The recess in the second portion of the end cap acts as an intermediary structure that receives and contains the adhesive sealant. This intermediary design separates the sealing function from the potting function, allowing each material to be applied independently without causing defects to the LED surface.
2Reliability
If the end cap is first sealed and then potting material is potted to the cover with circuit board, then sealing is achieved, but too many assembling steps are required
Solution Approach 1:
The end cap integrates both sealing and structural functions in a single component. The first portion provides sealing by closely mounting into the cover, while the second portion with the recess provides the sealing cavity. This merging allows the adhesive sealant to seal both the end cap and the cover simultaneously during a single potting operation, reducing the number of assembly steps while maintaining reliable sealing.
Solution Approach 2:
The end cap is designed as a multi-functional component: the first portion serves as the sealing interface with the cover, the second portion forms the recess for adhesive containment, and the integrated power line provides electrical connection. This multi-functionality eliminates the need for separate sealing and assembly operations, streamlining the manufacturing process.
3Loss of substance
If the second portion protrudes beyond the cover, then adhesive sealant flow is prevented, but adhesive sealant waste increases
Solution Approach 1:
The second portion of the end cap features a large diameter segment that protrudes beyond the cover only at the specific location where adhesive sealant containment is needed. This localized protrusion design prevents adhesive sealant from flowing outward during potting while minimizing the overall volume of the protrusion, thereby reducing adhesive sealant waste while maintaining encapsulating quality.
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 fine sealing effect with fewer assembly steps, reducing adhesive sealant waste and ensuring effective electrical contact, while maintaining a low-cost production process.
Implementation Method 1
adhesive sealant encapsulate the cover and seal the end cap by flowing into the recess
Data Source
AI summary
A lighting device may include: a cover in which a circuit board mounted with multiple lighting modules is provided, an end cap which is used to close the cover at least one end of the cover, as well as adhesive sealant, wherein the end cap includes a first portion that can be closely mounted into the cover and a second portion at the outside of the cover, and the second portion is configured to form a recess, the adhesive sealant encapsulate the cover and seal the end cap by flowing into the recess.