FPC Grounding Structure for Edge USB Connector Layouts
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Solution Overview
Problem
Conventional electronic devices face challenges in grounding flexible printed circuits (FPCs) due to insufficient ground space, particularly when USB sockets are disposed at the edge, leading to issues with parasitic inductance and electromagnetic radiation.
Innovation Solution
The electronic device incorporates a flexible printed circuit, a preset connector, a mainboard, a mainboard ground member, and a conductive structural member to facilitate nearby grounding of the FPC by shortening the ground path, using a conductive structural member to connect the FPC to the mainboard ground member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the USB socket is disposed at an edge of the electronic device, then the device structure is more flexible and compact, but the FPC cannot be grounded nearby due to insufficient ground space
Solution Approach 1:
The patent introduces a conductive structural member that extends in the thickness direction (first direction) to bridge the FPC and mainboard ground member. This vertical dimension approach allows grounding connection without requiring sufficient horizontal ground space, thus resolving the contradiction between edge positioning flexibility and grounding reliability.
Solution Approach 2:
The conductive structural member acts as an intermediary element between the FPC and the mainboard ground member. It provides a dedicated grounding path that connects the FPC ground terminal to the mainboard ground member, enabling reliable grounding even when traditional ground space is insufficient.
2Area of stationary object
If a long ground path is used for FPC grounding, then ground space requirements are met, but parasitic inductance increases and electromagnetic radiation worsens
Solution Approach 1:
The conductive structural member is positioned locally between the FPC and mainboard ground member, creating a short and direct grounding path. This localized approach reduces the ground path length significantly, thereby minimizing parasitic inductance and electromagnetic radiation while still providing adequate grounding capability.
3Stability of the object's composition
If the FPC is clamped between the interface socket and reinforcement plate, then the FPC location is stabilized, but additional structural components are required
Solution Approach 1:
The conductive structural member serves multiple functions: it provides the grounding connection path, acts as a support structure for clamping the FPC, and reinforces the interface socket assembly. By combining grounding and structural support functions into a single component, the patent reduces overall device complexity while achieving both grounding reliability and FPC stability.
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 solution effectively reduces parasitic inductance and improves grounding reliability, ensuring stable and reliable electrical connections while meeting electromagnetic radiation design requirements.
Implementation Method 1
the flexible printed circuit is electrically connected to the mainboard by using the conductive structural member and the preset connector
Implementation Method 2
the mainboard is connected to the mainboard ground member, to ground by using the mainboard ground member
Data Source
AI summary
This application discloses an electronic device. The electronic device includes a flexible printed circuit, a preset connector, a mainboard, a mainboard ground member, and a conductive structural member. The mainboard and the flexible printed circuit are disposed opposite to each other and spaced apart in a first direction, and the mainboard is connected to the mainboard ground member, to ground by using the mainboard ground member. The conductive structural member and the preset connector are disposed between the mainboard and the flexible printed circuit, and the flexible printed circuit is electrically connected to the mainboard by using the conductive structural member and the preset connector, to enable the flexible printed circuit to ground by using the mainboard ground member.