Flexible PCB Bending Structure for Tight Board Spacing
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Solution Overview
Problem
In electronic devices, flexible printed circuit boards (FPCBs) face disconnection issues due to excessive bending during connection processes, especially when the spacing between printed circuit boards is small or when bending is required around conductive terminals.
Innovation Solution
The flexible printed circuit board includes a connection part connected to a printed circuit board and a linkage part with a bending portion that is at least partially bendable. This design features a dielectric substrate with conductive layers and cover layers, and includes a cutoff portion in the conductive layer at the bending portion to prevent disconnection, with second conductive terminals connected through conductive via for reliable electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the spacing between printed circuit boards is reduced to achieve slimming of the electronic device, then the device thickness is reduced, but the flexible printed circuit board may be excessively bent causing disconnection of internal wiring
Solution Approach 1:
The flexible printed circuit board is segmented into a connection part with conductive terminals and a linkage part with bending portions. The conductive layer is divided into multiple sections (first conductive layer, second conductive layer) connected through conductive vias, allowing each segment to handle stress independently while maintaining overall electrical connectivity.
Solution Approach 2:
Different portions of the flexible printed circuit board are designed with different properties: the connection part has exposed conductive terminals for reliable connection, the linkage part has bending portions with cutoff portions in the conductive layer to prevent disconnection, and the dielectric substrate provides insulation throughout. This local differentiation allows the board to accommodate bending while maintaining wiring integrity.
2Adaptability or versatility
If bending is required around conductive terminals exposed to the outside to connect printed circuit boards, then connection flexibility is improved, but the possibility of disconnection of electrical wiring increases
Solution Approach 1:
Cutoff portions are pre-formed in the conductive layer at the bending portions during manufacturing. These cutoff portions prevent stress concentration and potential disconnection before actual bending occurs during assembly or use, ensuring wiring integrity is maintained from the outset.
Solution Approach 2:
Conductive vias act as intermediaries connecting the first conductive layer and second conductive layer through the dielectric substrate. This intermediary structure allows the conductive path to continue through the bending portion without direct stress on the conductive terminals, maintaining electrical connectivity while accommodating flexibility.
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.