Seal Structure for Flexible Wiring Boards Using Self-Adhesive Liquid Rubber
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Solution Overview
Problem
Existing seal structures for electronic devices face challenges in achieving good sealing performance without peeling off insulating layers, leading to high manufacturing costs and reduced service life of electromagnetic shielding layers, while also complicating assembly and making it difficult to integrate seal members with flexible wiring boards.
Innovation Solution
A seal structure is developed where self-adhesive liquid rubber is used to directly form seal members on the insulating layers of flexible wiring boards with elastic materials and conductive electromagnetic shielding layers, eliminating the need to peel off insulating layers and allowing for secure integration and cost-effective manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the insulating layer is peeled off to integrally form seal members on the flexible wiring board, then the seal members can be securely fixed, but the manufacturing cost increases and the service life of the electromagnetic shielding layer is adversely affected
Solution Approach 1:
A primer layer is introduced as an intermediary between the insulating layer and the seal member. The primer enhances adhesion between these two layers, allowing the seal member to be securely fixed without peeling off the insulating layer. This resolves the contradiction by providing strong fixing strength while maintaining the integrity and service life of the electromagnetic shielding layer.
2Strength
If the insulating layer is peeled off to form seal members, then secure integration is achieved, but the work required increases and assembly becomes more complex
Solution Approach 1:
The primer layer is applied in advance to the insulating layer before the seal member is formed. This preliminary action prepares the surface for optimal adhesion, allowing the seal member to be integrally formed directly on the insulating layer without subsequent peeling operations. This reduces assembly work and simplifies the manufacturing process while achieving secure integration.
3Reliability
If adhesive agents are used to fill gaps between wiring members and housing, then waterproof function is provided, but disassembly and reassembly become difficult
Solution Approach 1:
The seal member is designed to be self-adhesive through the primer layer, creating a self-sealing structure that provides waterproof function without requiring additional adhesive agents. This self-service approach maintains the waterproof reliability while allowing for easier disassembly and reassembly, as the seal member itself provides the sealing function without permanent adhesive bonding.
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 approach enables cost-effective and secure integration of seal members with flexible wiring boards, enhances waterproofing performance, and simplifies assembly, while maintaining good electrical and heat-resistant properties, effectively preventing water intrusion and supporting downsizing and weight reduction in electronic devices.
Implementation Method 1
the seal member is integrally formed directly on the insulating layers by using a self-adhesive liquid rubber
Implementation Method 2
a base FPC made of an elastic material
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Provided is a seal structure which has a seal member integrally formed on a flexible wiring board without peeling out an insulating layer (top coat) of the flexible wiring board, has excellent sealing performance and can be manufactured at a low cost. The seal structure is composed of a housing wherein the flexible wiring board is inserted through, and the seal member, which is integrally formed with the flexible wiring board and seals a gap between the housing and the flexible wiring board. The flexible wiring board is composed of a base FPC composed of an elastic material, a patterned copper foil and an adhesive layer, a conductive electromagnetic shielding layer formed on the surface of the base FPC, and an insulating layer covering the surface of the electromagnetic shielding layer. The seal member is directly and integrally formed on the insulating layer by using a self-adhesive liquid rubber.