Flexible PCB Reinforcing Element Curvature Control
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Solution Overview
Problem
Flexible printed circuit boards face damage due to small bending radii in restrictive mechanical environments, especially in dynamic contexts where they link moving electronic components, leading to reliability issues.
Innovation Solution
A flexible printed circuit board design featuring electrically insulating reinforcing elements that follow the curvature, allowing controlled bending radii and incorporating stiffening elements to manage deformation, thereby preventing damage and improving assembly reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the flexible printed circuit board is used in a restrictive mechanical environment with small bending radius, then the board can be mounted in limited space, but the small bending radius risks damaging the printed circuit board and its conductive tracks
Solution Approach 1:
The reinforcing element is divided into two distinct parts: a first substantially planar part and a second part exhibiting a predefined curvature. This segmentation allows the reinforcing element to provide structural support while accommodating the necessary bending radius, preventing damage to the flexible printed circuit board in restrictive mounting spaces.
Solution Approach 2:
The second part of the reinforcing element exhibits a predefined curvature that matches the curvature of the flexible element. This curvature design ensures that the reinforcing element follows the bend path while maintaining structural integrity, preventing excessive stress concentration that would occur with a completely rigid reinforcement.
2Reliability
If reinforcing elements are added to prevent damage from small bending radii, then the reliability of the assembly is improved, but the device complexity and assembly process may increase
Solution Approach 1:
The reinforcing element combines both planar and curved sections into a single integrated component that is mechanically secured to the flexible element. This merging approach provides comprehensive reinforcement along the entire bending path without requiring multiple separate reinforcement components, thus improving reliability while controlling device complexity.
3Manufacturing precision
If the reinforcing element follows the curvature of the flexible element, then the bending radius is controlled and managed accurately, but the manufacturing precision requirements increase
Solution Approach 1:
The reinforcing element is pre-formed with a predefined curvature that corresponds to the required bending radius of the flexible printed circuit board. This preliminary shaping allows for accurate control of the bending radius during assembly without requiring complex real-time adjustments or high-precision positioning operations during the manufacturing process.
Data Source
AI summary
A flexible printed circuit board, configured to receive electronic components, comprising an electrically insulating flexible element, configured to bear conductive component-connecting tracks, the flexible element being further configured to be bent according to a curvature, the board further comprising an electrically insulating reinforcing element, mechanically secured to the flexible element, extending on one side of the curvature, and comprising two parts: a first part being substantially planar and a second part exhibiting a predefined curvature, arranged on the side of the curvature of the flexible element, the reinforcing element being arranged so as to leave a free part for the flexible element to be bent according to the curvature.