Image Display Device Sealing for Waterproof Case Fittings
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Solution Overview
Problem
Existing image display devices face issues with waterproofing deterioration due to loosening of exterior case fittings, compromising the integrity of the waterproof function.
Innovation Solution
The image display device incorporates a metallic frame supporting a circuit board, an optical case, and an exterior case with a first seal member at a facing portion between the upper and lower cases, enhancing sealing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If waterproofing is achieved by fitting the inner case and the exterior case together, then the device can be waterproofed, but when fastening of the exterior case is loosened, the waterproof function deteriorates in the fitting portion
Solution Approach 1:
The patent employs seal members (gaskets) made of flexible elastic materials at the fitting portions between case members. These flexible sealing elements can deform to maintain contact and sealing effectiveness even when fastening loosens slightly, thereby preserving the waterproof function while accommodating variations in assembly tightness.
2Ease of manufacture
If multiple case members are fitted together to achieve waterproofing, then the device structure can be modular and waterproofed, but the complexity of ensuring consistent sealing increases
Solution Approach 1:
The use of elastic seal members simplifies the sealing structure by replacing complex rigid sealing mechanisms with flexible gaskets that naturally conform to the fitting surfaces. This maintains modular assembly ease while reducing sealing complexity, as the elastic materials self-adjust to maintain waterproofing without requiring precision fastening.
Solution Approach 2:
The seal members act as intermediary elements between the case members, providing a dedicated sealing interface that isolates the complexity of waterproofing from the structural assembly. This intermediary layer allows the case members to be simply fitted together while the seal member handles the sealing function, reducing overall system complexity.
Data Source
AI summary
An image display device includes a display element, an optical member for imaging, a circuit board, an optical case configured to accommodate the display element and the optical member, a metallic frame configured to support the circuit board from below, and an exterior case configured to accommodate the optical case and the metallic frame, wherein the metallic frame is disposed above the optical case, and the exterior case includes an upper case and a lower case, and includes a first seal member at a first facing portion between the upper case and the lower case.