Flexible PCB Coupling Structure for Bend-Safe Board Connections
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Solution Overview
Problem
Flexible printed circuit boards (FPCBs) face disconnection issues due to excessive bending when connecting printed circuit boards with close spacing, which can lead to inefficient mounting of electronic components and increased risk of electrical disconnection.
Innovation Solution
The FPCB features a dielectric substrate with a first and second conductive layer, cover layers, and conductive terminals, including a cutoff portion at the bending area to prevent disconnection, allowing the second conductive terminals to remain connected through conductive vias, ensuring electrical continuity despite bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the flexible printed circuit board is bent excessively to connect printed circuit boards with close spacing, then the mounting space for electronic components is improved, but the electrical wiring may be disconnected
Solution Approach 1:
The flexible printed circuit board is divided into multiple conductive layers (first conductive layer, second conductive layer) separated by a dielectric substrate. The cutoff portion is selectively applied to specific conductive layers at the bending region, segmenting the electrical connection paths to maintain reliability while allowing necessary bending for compact mounting space.
Solution Approach 2:
The cutoff portion is applied locally only at the bending region of the flexible printed circuit board, specifically where the first conductive layer is disconnected. Other regions maintain continuous conductive paths, providing local reinforcement exactly where bending stress occurs while preserving electrical connectivity in non-bending areas.
2Reliability
If the spacing between printed circuit boards is widened to prevent disconnection, then the electrical connection reliability is improved, but the device thickness increases
Solution Approach 1:
The patent uses a flexible printed circuit board with a thin dielectric substrate and multiple conductive layers to create a compact, flexible connection solution. This allows the circuit board to bend and adapt to close spacing between printed circuit boards without requiring increased device thickness, while the cutoff portion design ensures connection reliability is maintained.
3Adaptability or versatility
If bending is required around conductive terminals to connect printed circuit boards, then the adaptability of the connection is improved, but the possibility of disconnection increases
Solution Approach 1:
The cutoff portion is selectively applied to the first conductive layer at the bending region, while the second conductive layer maintains continuous connectivity. This local differentiation allows the FPCB to bend adaptively around conductive terminals while preserving electrical integrity through the strategically positioned cutoff that prevents stress concentration at critical connection points.
Data Source
AI summary
An electronic device is provided. The electronic device includes a flexible printed circuit board comprising a housing, a first printed circuit board disposed in an inner space of the housing, a second printed circuit board disposed so as to be spaced apart from the first printed circuit board, a connection part electrically connecting the first printed circuit board and the second printed circuit board and connected to the second printed circuit board, and a coupling part including a bent part extending from the connection part and capable of being at least partially bent.