Flexible PCB Layout With Fan-Shaped Rigid Corner for Signal Integrity
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Solution Overview
Problem
Flexible printed circuit boards face challenges in extending and disposing within electronic devices while maintaining signal transmission performance and minimizing interference with other components in a restricted space.
Innovation Solution
The flexible printed circuit board incorporates a fan-shaped rigid portion with conductive vias and a ground structure that surrounds signal lines, along with specific bending axes and connectors to reduce interference and enhance signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the flexible printed circuit board is extended and disposed within the electronic device, then the electrical connection between first electrical element and second electrical element is achieved, but structural complexity and interference with other components increase
Solution Approach 1:
The flexible printed circuit board is divided into multiple portions (first portion, second portion, third portion) with different characteristics. The first and second portions are flexible for routing, while the third portion contains a rigid fan-shaped structure for stable electrical connection. This segmentation allows the circuit board to achieve electrical connectivity while managing structural complexity through functional division.
Solution Approach 2:
The patent employs a fan-shaped rigid portion with curved geometry instead of a straight linear structure. This curved/fan-shaped design allows the circuit board to navigate around other components in the restricted space, reducing structural interference while maintaining the necessary electrical connection path between components.
2Ease of operation
If the flexible printed circuit board is extended in restricted space, then connection between electrical elements is achieved, but signal transmission performance deteriorates due to interference
Solution Approach 1:
Different portions of the flexible printed circuit board are assigned different qualities and functions. The first and second portions are designed as flexible regions for routing, while the third portion contains a rigid fan-shaped structure with specific electrical connection characteristics. This local differentiation ensures that signal transmission occurs through optimized paths with appropriate structural support, maintaining reliability while achieving connection in restricted space.
Solution Approach 2:
The fan-shaped rigid portion acts as an intermediary structure between the flexible first and second portions. This intermediate rigid section provides stable electrical connection and signal transmission, mediating between the flexible routing sections and reducing signal degradation that would occur if the entire path were flexible.
3Stability of the object's composition
If the flexible printed circuit board uses rigid portion for stable connection, then electrical stability is improved, but flexibility and ease of disposal in restricted space is reduced
Solution Approach 1:
The circuit board is segmented into flexible portions and a rigid portion, allowing each section to fulfill its specific function. The flexible portions enable the board to be disposed in restricted spaces and adapt to the device layout, while the rigid fan-shaped portion provides stable electrical connection where needed.
Solution Approach 2:
Rigidity is applied locally only where electrical stability is critical (the third portion with fan-shaped rigid structure), while other portions remain flexible for routing and adaptation. This localized application of rigidity maintains overall flexibility of the circuit board while providing stable connection points.
Data Source
AI summary
An electronic device includes a first electrical element, a second electrical element, and a flexible printed circuit board. The flexible printed circuit board connects the first electrical element and the second electrical element. The flexible printed circuit board includes a first portion on which a first connector electrically connected to the first electrical element is disposed, a second portion on which a second connector electrically connected to the second electrical element is disposed, and a third portion between the first portion and the second portion. The third portion includes a first partial region extending from the first portion, a second partial region extending from the second portion, and a corner between the first partial region and the second partial region. The corner includes a fan-shaped rigid portion.