Capacitive Coupling Pad Layout for Contactless Card Biometric Enrollment

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Solution Overview

Problem

Biometric enrollment in contactless smartcards is cumbersome due to the lack of user interfaces and the need for users to actively position the smartcard during enrollment, making it difficult to achieve secure and convenient biometric authentication.

Innovation Solution

An enrollment assistance device using wireless power transfer from a mobile phone to a contactless smartcard, facilitated by conductor spirals and capacitive coupling pads, allowing the smartcard and mobile phone to be arranged without active user intervention, enabling guided biometric enrollment and eliminating the need for batteries or conductive connections.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of information

If visual markers are displayed on mobile device screen to guide smartcard positioning, then enrollment guidance is improved, but user operation becomes cumbersome due to requiring simultaneous card pressing and display following

Engineering Contradiction:

Improveenrollment guidanceVSAvoiduser operation

Core Design Contradiction:

Loss of informationVSEase of operation

Solution Approach 1:

The patent introduces an intermediary enrollment assistance device that acts as a mediator between the mobile device and smartcard. This device receives guidance information from the mobile device display and transmits it to the smartcard, eliminating the need for the user to simultaneously watch the display and position the card. The intermediary handles the coordination, improving ease of operation while maintaining enrollment guidance.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If wireless power transfer is implemented between mobile phone and smartcard, then user intervention during positioning is reduced, but device complexity increases due to additional power transfer components

Engineering Contradiction:

Improvepositioning interventionVSAvoidpower transfer components

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The enrollment assistance device incorporates multiple functions into a single device: it serves as a power transfer interface, a communication intermediary, and a positioning aid. By combining these functions, the system reduces the need for separate components in each device (mobile phone and smartcard), thereby reducing overall system complexity while enabling wireless power transfer and automated positioning.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system enables self-service positioning where the smartcard and mobile device automatically align through wireless power transfer guidance without requiring active user intervention for positioning. The enrollment assistance device facilitates this self-alignment process, reducing operational complexity despite adding power transfer capabilities.

Inventive Principle:

Principle #25Self-service

3Adaptability or versatility

If capacitive coupling pads are used to connect conductor spirals, then conductive vias are eliminated enabling multi-layer configurations, but manufacturing precision requirements increase

Engineering Contradiction:

Improvemulti-layer configurationVSAvoidcapacitive coupling alignment

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The capacitive coupling pads use a simple, inexpensive structure that can be easily manufactured and replaced if needed. Rather than requiring complex conductive via structures that demand high precision, the patent employs simple capacitive coupling elements that are tolerant to manufacturing variations, reducing precision requirements while enabling multi-layer configurations.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 simplifies the enrollment process, enhances biometric template quality, reduces production costs, and allows for multi-layer configurations without conductive vias, resulting in a more user-friendly and cost-effective biometric enrollment system.

Implementation Method 1

capacitive coupling pads arranged to capacitively connect the first and second conductor spirals such that power can be transferred from the mobile phone to the contactless smartcard via the first and second conductor spirals and the capacitive coupling pads

Methodology Applied

Scientific EffectCapacitive coupling: Capacitance

Implementation Method 2

a first conductor spiral arranged to form a first wireless power transfer link with a wireless power transfer arrangement of the mobile phone when the mobile phone is arranged on a first surface portion of the enrollment assistance device

Methodology Applied

Scientific EffectWireless power transfer: Electromagnetic Induction

Data Source

PatentEP4296887B1Enrollment assistance device with capacitive coupling pads, biometric system and enrollment method

Publication Date: 2024.06.26 FINGERPRINT CARDS ANACATUM IP AB

Figure 1A~1B
Figure 2
Figure 3A~3B

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.