Variable Thickness Flexible Printed Circuit Bending
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Solution Overview
Problem
Forming bends in flexible printed circuits with relatively thick substrate materials is challenging, as existing methods struggle to accommodate both the mechanical and electrical requirements for transmission lines and bending within the confines of electronic devices.
Innovation Solution
Flexible printed circuit structures are designed with regions of varying thickness and mechanical properties, utilizing different substrate thicknesses and features like grooves and openings to facilitate bending, achieved through techniques such as die forming, extrusion, and light-based processing, allowing for the integration of these circuits in tight electronic device housings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If flexible printed circuits use relatively thick substrate material, then mechanical strength and electrical performance are improved, but the ability to form bends is worsened
Solution Approach 1:
The substrate is divided into multiple thickness zones, with thicker regions providing mechanical strength and electrical performance, and thinner regions enabling bend formation. This segmentation allows different parts of the substrate to serve different functional requirements simultaneously.
Solution Approach 2:
The substrate exhibits non-uniform thickness distribution, with locally varied mechanical properties. Thicker regions are positioned where strength is needed, while thinner regions are positioned where flexibility and bendability are required, creating local quality variations that resolve the contradiction.
2Volume of moving object
If flexible printed circuits are bent to fit tight device housing, then space utilization is improved, but substrate integrity and electrical performance are worsened
Solution Approach 1:
The substrate is segmented into different thickness regions, allowing bends to form in thinner regions while thicker regions maintain structural integrity and electrical performance. This enables the circuit to conform to tight housing spaces without compromising overall reliability.
Solution Approach 2:
The substrate thickness parameter is varied spatially to optimize both bendability and integrity. By changing the thickness parameter in different regions, the substrate can achieve the necessary flexibility for tight packaging while maintaining adequate strength and electrical characteristics in critical areas.
3Ease of manufacture
If uniform thickness substrate is used, then manufacturing simplicity is improved, but ability to satisfy both transmission line and bending requirements is worsened
Solution Approach 1:
The substrate is designed with non-uniform thickness, creating local quality variations that enable different regions to satisfy different requirements. Thicker regions optimize transmission line performance while thinner regions facilitate bending, allowing the single substrate to meet multiple conflicting requirements simultaneously.
Data Source
AI summary
Flexible printed circuit structures may be provided that have regions with different electrical and mechanical properties. A flexible printed circuit substrate may be formed from a sheet of polymer having different regions with different thicknesses. The flexible printed circuit substrate may be bent in a thin region of the substrate. Additional flexible printed circuit substrate portions may be coupled to the flexible printed circuit substrate. The additional portions may have different substrate thicknesses. A groove or other recess may be formed in a flexible printed circuit substrate to promote bending. Openings may also be formed in the substrate to promote bending.