Capacitive-Coupled Enrollment Pad for Contactless Biometric Cards
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Solution Overview
Problem
Challenging to provide secure, reliable, and convenient biometric enrollment for devices with limited user interfaces, such as contactless smartcards, due to the complexity of aligning the smartcard with the user device during enrollment.
Innovation Solution
An enrollment assistance device with conductor spirals and capacitive coupling pads that facilitate wireless power transfer between a user device and a contactless smartcard, allowing for guided enrollment without the need for active user alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a visual marker is displayed on the mobile device screen to guide user positioning, then the user can be guided to correctly arrange the smartcard, but the enrollment process becomes cumbersome requiring the user to simultaneously press the smartcard against the device backside while following display instructions
Solution Approach 1:
The patent introduces an intermediary alignment mechanism (alignment marks or guides on the enrollment assistance device) that mediates between the user device and smartcard positioning. This intermediary provides passive visual guidance without requiring the user to simultaneously process active display instructions and perform precise manual alignment, thereby reducing procedural complexity while maintaining ease of operation.
2Reliability
If conductive vias are used to connect conductor layers in the enrollment assistance device, then electrical connectivity can be achieved, but production costs and environmental impact increase
Solution Approach 1:
The patent extracts and eliminates the need for conductive vias from the enrollment assistance device structure. By redesigning the electrical connection approach to use alternative methods (such as edge contacts or surface-mounted connections), the invention removes the problematic via structure entirely, thereby reducing production costs and environmental impact while maintaining reliable electrical connectivity between conductor layers.
3Use of energy by moving object
If a battery is included in the enrollment assistance device to power the biometric arrangement, then the device can operate independently, but device complexity and production costs increase
Solution Approach 1:
The patent replaces the mechanical/electrical battery power system with a wireless power transfer system using electromagnetic induction. The enrollment assistance device incorporates a power transfer coil that wirelessly transmits power to the biometric arrangement in the smartcard or user device, eliminating the need for a physical battery, its associated power management circuitry, and housing modifications, thereby reducing device complexity and production costs while maintaining independent operation capability.
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
Enables a more user-friendly and efficient biometric enrollment process with higher quality templates, reducing environmental impact and production costs by eliminating the need for conductive vias and batteries.
Implementation Method 1
the first conductor end is conductively connected to a first capacitive coupling pad of the first conductor spiral and the second conductor end is conductively connected to a second capacitive coupling pad of the first conductor spiral; and a second conductor spiral in a second conductor layer of the enrollment assistance device conductively separated from the first conductor layer by an insulating layer
Data Source
AI summary
An enrollment assistance device with a first surface portion for a user device, and a second surface portion for a contactless smartcard; a first conductor spiral arranged in the first surface portion; a second conductor spiral conductively separated from the first conductor spiral and arranged in the second surface portion. The first conductor spiral and the second conductor spiral are coupled to each other by capacitive coupling pads.