Waterproof LED Sealing via Sandwiched Annular Cover
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Solution Overview
Problem
Conventional light emitting devices face issues with pressure variation and water resistance, leading to separation of waterproof films when exposed to ambient temperature changes or water pressure.
Innovation Solution
A light emitting device design featuring a substrate with a light emitting element, an annular sealing member, a waterproof sheet, and an annular cover, where the waterproof sheet is fixed between the sealing member and the cover, allowing for hermetic sealing and resistance to pressure variations, and is suitable for use in water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the air discharge passage is blocked by sealing material to prevent moisture ingress, then waterproofness is improved, but pressure variation during operation causes separation of the waterproof film
Solution Approach 1:
The patent divides the sealing structure into multiple functional components: a waterproof film for moisture barrier, an annular sealing member for pressure equalization, and a cover for structural support. This segmentation allows each component to address specific requirements without compromising others.
Solution Approach 2:
The annular sealing member acts as an intermediary between the waterproof film and the external environment, providing a compliant sealing interface that accommodates pressure variations while maintaining the hermetic seal of the waterproof film.
2Reliability
If a waterproof film is used to cover LEDs and spacers, then moisture protection is improved, but water pressure causes separation when immersed in water
Solution Approach 1:
The patent employs a flexible waterproof film that can deform under water pressure without separating from the LED structure. This flexible film works in conjunction with the annular sealing member to maintain the hermetic seal while accommodating external pressure.
Solution Approach 2:
The annular sealing member provides a counterbalancing force against water pressure, distributing the load and preventing the waterproof film from separating from the LED package under immersion conditions.
3Reliability
If the transparent member is hermetically sealed to the LED package, then waterproofness is improved, but thermal expansion and contraction cause separation
Solution Approach 1:
The patent utilizes the elastic properties of the annular sealing member to accommodate thermal expansion and contraction of the transparent member and LED package. The sealing member's material parameters are selected to provide compliance under thermal cycling conditions.
Solution Approach 2:
The design accounts for thermal expansion by using the annular sealing member as a compliant element that can expand and contract with temperature changes, maintaining the hermetic seal without causing separation of the transparent member.
Data Source
AI summary
A light emitting device includes a substrate, a light emitting element mounted on the substrate, an uninterrupted annular sealing member installed in such a manner as to surround the light emitting element, a waterproof sheet installed in such a manner as to cover an upper side of the light emitting element and the sealing member, and transmit light emitted from the light emitting element, and an uninterrupted annular cover installed on the waterproof sheet, with a region of the cover being open above the light emitting element. The waterproof sheet is being fixed by sandwiching the waterproof sheet between the sealing member and the cover. A mounting region for the light emitting element on the substrate, which is being laterally surrounded by the sealing member while being covered by the waterproof sheet, is being hermetically sealed.