Contactless Smart-Card Reader Coil via Segmented PCB Tracks
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Solution Overview
Problem
Existing smart card readers are restrictive and costly due to the complexity of manufacturing a planar coil antenna, which requires manual winding and connection of metal wire, limiting their usability and efficiency in reading both contactless and contact smart cards without compromising the user interface.
Innovation Solution
A smart card reader design featuring two electronic cards joined by electrical connectors, where the coil is formed by tracks on each card connected via these connectors, eliminating the need for manual winding and reducing production overhead, allowing for both contactless and contact communication without additional assembly steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a planar coil antenna is manufactured using traditional manual winding methods, then the coil can be produced with required precision, but the manufacturing complexity and cost increase significantly
Solution Approach 1:
The coil is segmented across two separate electronic cards (card 31 and card 32), with each card carrying a portion of the coil windings. The connectors bridge these segments to form the complete coil circuit, dividing the manufacturing complexity across standard PCB production processes rather than requiring single-piece manual winding
Solution Approach 2:
The manual mechanical winding process is replaced by automated PCB track fabrication. The coil windings are created as conductive tracks on the electronic cards using standard PCB manufacturing techniques, eliminating the need for manual wire winding and connection operations
2Adaptability or versatility
If an external coil component is added to the reader, then contactless reading capability is achieved, but the manufacturing cost and assembly complexity increase
Solution Approach 1:
The coil antenna is merged with the electronic cards that are already part of the reader system. The conductive tracks on the cards serve dual purposes as both circuit interconnections and coil windings, eliminating the need for separate external coil components and their associated mounting and connection hardware
Solution Approach 2:
The electronic cards serve multiple functions: they provide structural support, electrical interconnections through their circuit traces, and the coil antenna functionality. This multi-functionality eliminates the need for dedicated external coil components, reducing part count and assembly complexity
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
The solution enables cost-effective production and flexible operation, allowing for seamless reading of contactless and contact smart cards without disturbing the user interface, as the coil's magnetic axis is perpendicular to the detection face, naturally selecting between communication modes without manual conflict management.
Implementation Method 1
the electromagnetic signals not only allow the exchange of data between the smart card and the reader, but also the remote power supply of the card by magnetic induction
Data Source
Figure 1~2
AI summary
The invention relates to a reader adapted for contactless reading of a smart card, comprising two electronic cards (31, 32) joined together by electrical connectors (34) and an electromagnetic signal transmission/reception antenna comprising a coil with a plurality of coaxial windings. The reader is characterized in that a winding of the coil consists of: • a first track (21) traced on the first electronic card (31), • a second track traced on the second electronic card (32), a first end of the second track being electrically connected to a first end of the first track by an internal connecting element of a first connector (34), and a second end of the second track being electrically connected to an internal connecting element of a second connector (34). Application to the implementation of a healthcare smart card reader