L-Shaped Connection Bridges for Dual-Interface Transponder Modules
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Solution Overview
Problem
Existing dual-interface RFID smartcards and secure documents face challenges with fragile and inefficient connection bridges that are not robust enough to support wire bonding and require plated-through holes, limiting their functionality and durability.
Innovation Solution
The development of L-shaped connection bridges with a significant area comparable to or greater than that of contact pads, which extend around corners and are integral with a coupling frame, allowing for robust interconnections without plated-through holes and accommodating wire bonding, thereby enhancing durability and versatility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional connection bridges are used in dual-interface RFID smartcards, then the device can maintain a compact structure, but the connection bridges are fragile and not robust enough to support wire bonding
Solution Approach 1:
The connection bridge is extended into a third dimension by forming it as an integral, raised structure from the substrate material itself. This dimensional change provides inherent mechanical strength and stability, enabling the bridge to support wire bonding while maintaining a compact overall device structure. The raised configuration creates a robust platform that naturally withstands mechanical stress without requiring additional complex support structures.
Solution Approach 2:
The integral connection bridge serves multiple functions simultaneously: it provides electrical connection between contact pads and circuit elements, acts as a mechanical support structure for wire bonding, and functions as part of the substrate integration system. This multi-functionality eliminates the need for separate fragile connection structures, thereby improving robustness without significantly increasing device complexity.
2Reliability
If plated-through holes are required for connection, then electrical connectivity can be achieved, but the process becomes more complex and durability is reduced
Solution Approach 1:
The invention extracts and eliminates the plated-through hole process from the manufacturing sequence. Instead of creating holes through the substrate and applying plating, the connection bridge is formed as a continuous integral structure from the substrate material. This removal of the hole-making and plating steps significantly simplifies the manufacturing process while simultaneously improving durability by eliminating potential failure points associated with holes and plating layers.
Solution Approach 2:
The connection bridge is merged with the substrate as a single integral structure, combining what were previously separate elements (substrate and connection pathway) into one unified component. This merging eliminates the need for plated-through holes and associated complex manufacturing steps, while creating a more durable interconnection that is inherently resistant to failure.
3Adaptability or versatility
If connection bridges have small area, then the device layout remains compact, but they cannot accommodate wire bonding or handle mechanical stress
Solution Approach 1:
The connection bridge transitions from a two-dimensional planar trace to a three-dimensional raised structure. This dimensional change allows the bridge to accommodate wire bonding capability while minimizing the horizontal footprint. The vertical dimension provides the necessary mechanical strength and surface area for wire attachment without significantly increasing the overall device layout area.
4Strength
If connection bridges are made robust with large area, then they can support wire bonding and handle stress, but the overall device size increases
Solution Approach 1:
The connection bridge utilizes the vertical dimension to achieve mechanical strength rather than relying solely on horizontal area expansion. By forming a raised, three-dimensional structure, the bridge gains structural integrity and load-bearing capacity while maintaining a compact horizontal footprint. This dimensional approach allows wire bonding capability without proportionally increasing the device's overall footprint.
Solution Approach 2:
The connection bridge is formed as a thin, raised film or shell structure that provides substantial mechanical strength relative to its footprint. This thin-film approach creates a robust connection point for wire bonding while minimizing the horizontal space required, thereby achieving high strength-to-footprint ratio.
Data Source
AI summary
Connection bridges (CBR) for dual-interface transponder chip modules (TCM) 200 may have an area which is substantially equal to or greater than an area of a contact pad (CP) of a contact pad array (CPA). A given connection bridge may be L-shaped and may comprise (i) a first portion disposed external to the contact pad array and extending parallel to the insertion direction, and (ii) a second portion extending from an end of the first portion perpendicular to the insertion direction to within the contact pad array (CPA) such as between C1 and C5. The connection bridge may extend around a corner of the contact pad array, may be large enough to accommodate wire bonding, and may be integral with a coupling frame (CF) extending around the contact pad array. The transponder chip modules may be integrated into a smart card (SC).