Flexible Printed Circuit Interposer for Reliable Electrical Coupling
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Solution Overview
Problem
Dense contact arrays in electronic circuitry face challenges in achieving reliable electrical coupling without faults or discontinuities, leading to increased costs for correcting inadequate contact issues.
Innovation Solution
The use of a flexible printed circuit with a compliant interposer material positioned between contact arrays on a card and a receptacle, allowing for alignment and electrical coupling, with the interposer material providing compliance to ensure effective mating and reduce frictional forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If contact arrays are made denser to increase signal capacity, then the quantity of contacts and signal transmission capability are improved, but the difficulty of achieving reliable electrical coupling increases and fault rates rise
Solution Approach 1:
The patent changes the physical state and mechanical properties of the interposer material from rigid to compliant/flexible. This allows the interposer to deform and adapt to misalignments between contact arrays, maintaining reliable electrical coupling even when contact density increases and tolerances tighten. The compliant material's ability to undergo elastic deformation compensates for manufacturing variations and assembly tolerances.
Solution Approach 2:
The patent introduces a compliant interposer material as an intermediary component between the first and second contact arrays. This interposer serves as a mediator that absorbs misalignments and ensures reliable electrical coupling. The interposer's compliance allows it to conform to the actual contact array positions, preventing faults that would occur with rigid direct coupling, especially important when contact density is high and tolerances are tight.
2Manufacturing precision
If rigid coupling structures are used to maintain alignment, then manufacturing precision is easier to achieve, but the ability to conform to receptacle topology and reduce frictional forces is lost
Solution Approach 1:
The patent transforms the static, rigid coupling structure into a dynamic, compliant structure. The interposer material can deform elastically to adapt to the receptacle's topology and contact array positions. This dynamic capability allows the system to maintain manufacturing precision while simultaneously adapting to variations in receptacle geometry and reducing frictional forces during insertion and operation.
Solution Approach 2:
The patent employs a compliant interposer material that functions similarly to flexible shells and thin films. This material can bend, stretch, and conform to the receptacle's topology, providing both alignment precision and adaptability. The flexible nature of the interposer allows it to maintain contact pressure while accommodating manufacturing tolerances and receptacle variations, unlike rigid structures that would either fail to conform or generate excessive friction.
3Adaptability or versatility
If compliant interposer material is used to ensure conformance, then adaptability to receptacle topology is improved and frictional forces are reduced, but manufacturing complexity increases
Solution Approach 1:
The patent merges the interposer material with the flexible printed circuit board (FPC) or integrates it directly into the card assembly. This combination simplifies manufacturing by reducing the number of separate components and assembly steps. The compliant material is incorporated into the existing FPC fabrication process or attached during standard assembly operations, thereby achieving adaptability without proportionally increasing manufacturing complexity.
Solution Approach 2:
The patent utilizes materials with specific compliance parameters that can be selected and optimized during the design phase. By choosing interposer materials with appropriate durometer values, thickness, and elastic properties, the system achieves the desired conformance and friction reduction while maintaining compatibility with standard manufacturing processes. The material parameters are tuned to provide sufficient compliance without requiring complex multi-layer or multi-material constructions.
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 ensures reliable electrical coupling between contact arrays by conforming to the receptacle's topology, reducing the risk of dislodgment and maintaining stable connections, thereby minimizing costs associated with correcting contact anomalies.
Implementation Method 1
conforming the second pad array to a topology of the corresponding contact array in the receptacle by virtue of a degree of compliance of the compliant interposer material
Data Source
AI summary
Disclosed are various embodiments of electrical coupling apparatuses and methods. In one embodiment, an electrical coupling apparatus is provided having a first contact array on a card, where the first contact array is located at a first predefined position relative to an insertion edge of the card. The apparatus also includes a flexible printed circuit having a second contact array corresponding to the first contact array, where the second contact array is positioned in alignment with the first contact array. A compliant interposer material is positioned between the first and second contact arrays, the compliant interposer material electrically coupling respective pairs of contacts in the first and second contact arrays. Also, the insertion edge is configured to be inserted into a receptacle, the second contact array being positioned relative to the insertion edge so as to mate with a corresponding contact array in the receptacle when the insertion edge is inserted into the receptacle.