Flexible Inductor Bridge with Segmented Rigid and Flexible Substrates
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Solution Overview
Problem
Conventional flexible inductor bridges in electronic devices face issues with poor connection reliability and inductance deviation due to bending stress, which affects the joining portion and coil performance.
Innovation Solution
The design incorporates a flexible substrate with a combination of rigid and flexible portions, where the rigid portions include a coil and a joining portion, and the flexible portion is adjacent to the rigid portion, reducing stress transmission and maintaining connection reliability while minimizing inductance deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the inductor bridge is arranged in a limited space with bending portions, then the inductor bridge can be mounted on circuit boards and connect different circuit portions, but bending stress is applied to the joining portion causing poor connection
Solution Approach 1:
The inductor bridge is divided into distinct rigid portions and flexible portions. The rigid portions maintain structural stability and reliable connections, while the flexible portions accommodate bending and spatial constraints. This segmentation allows the inductor bridge to be mounted in limited spaces without compromising connection reliability at the joining portions.
Solution Approach 2:
Different portions of the inductor bridge are designed with different mechanical properties: rigid portions where connections are made have high stiffness to prevent deformation, while intermediate portions have flexibility to accommodate bending. This local differentiation of mechanical properties ensures that bending stress does not affect the joining portions.
2Adaptability or versatility
If the coil is deformed under bending influence, then the inductor bridge can adapt to spatial constraints, but the inductance deviates from specified value
Solution Approach 1:
The coil is positioned within rigid portions that are separated from flexible portions. This segmentation ensures that the coil structure remains stable and undeformed while the flexible portions bend to adapt to spatial constraints, thereby maintaining precise inductance values.
Solution Approach 2:
The rigid portions containing the coil are designed with high stiffness to prevent deformation and maintain precise inductance, while other portions are designed with flexibility for spatial adaptation. This local quality differentiation allows the inductor bridge to meet both spatial and electrical performance requirements.
Data Source
AI summary
An inductor bridge includes a flexible substrate and a coil defined by a conductor pattern provided on or in the flexible substrate, and connects a plurality of circuit portions. The flexible substrate includes a rigid portion and a flexible portion, the rigid portion being wider than the flexible portion. The rigid portion includes the coil and a joining portion connected to another circuit. The coil includes two coil portions located at different positions in plan view, a flexible portion is located adjacent to one side of the rigid portion, and at least two coil portions of the plurality of coil portions are located on the one side when viewed from the joining portion.