Fingerprint Sensor Antenna Assembly for Mass-Produced Chip Cards
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current biometric smart cards with fingerprint sensors face challenges in cost-effectiveness, reliability, and mass production feasibility due to complex constructions and non-standard production methods for PCB-substrate-based sensors.
Innovation Solution
A sensor device comprising a fingerprint sensor and an integrated antenna, assembled from a sensor component and a carrier component using standard 35 mm carrier tape for roll-to-roll production, enabling easy integration into chip cards via inductive coupling for both data transmission and energy supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If PCB-substrate-based biometric sensors are produced from PCB panels using stamping, milling or cutting, then the sensors can be manufactured, but the production method is not suitable for mass production and lacks standard provision
Solution Approach 1:
The sensor device is divided into separate components: the sensor element and the carrier component. This segmentation allows the sensor to be produced using standard PCB methods while the carrier provides mass-production compatibility through standardized mounting structures and carrier tape integration.
Solution Approach 2:
The carrier component serves multiple functions: it provides mechanical support for the sensor, enables standardized mounting in chip cards, facilitates mass production through carrier tape compatibility, and provides electrical connections. This multi-functionality resolves the contradiction between specialized sensor production and general mass production requirements.
2Adaptability or versatility
If a complex construction with multiple components electrically connected is used for biometric smart cards, then the functionality is enhanced, but the construction complexity increases and cost-effectiveness decreases
Solution Approach 1:
The sensor element, antenna, and mounting structure are merged into a single integrated sensor device. The carrier component consolidates multiple functions including mechanical support, electrical connections, and antenna integration, reducing the overall system complexity while maintaining biometric functionality.
Solution Approach 2:
The sensor element is nested within the carrier component, which itself is integrated into the chip card structure. This nested arrangement reduces the number of separate components and simplifies the overall construction while maintaining all necessary functionalities.
3Ease of operation
If standard chip card implanting equipment and hotmelt implantation are used, then the integration process is simplified, but the sensor device must be easily mountable and suitable for mass production
Solution Approach 1:
The sensor element is pre-mounted onto the carrier component with pre-formed mounting structures and electrical connections. This preliminary assembly ensures proper alignment and connection before the final hotmelt implantation into the chip card, maintaining both ease of operation and mounting reliability.
Solution Approach 2:
The carrier component acts as an intermediary between the sensor element and the chip card. It provides standardized mounting interfaces that are compatible with both the sensor and the chip card implantation process, ensuring reliable integration while simplifying the overall assembly operation.
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 provides a cost-effective, reliable, and easily assembled biometric sensor system suitable for mass production, integrating a fingerprint sensor and antenna within a chip card using standard equipment and processes, enhancing functionality and reducing production complexities.
Implementation Method 1
an antenna coupled to the fingerprint sensor, for inductively coupling the fingerprint sensor to a booster antenna
Data Source
AI summary
A sensor device including a fingerprint sensor and an antenna. The a fingerprint sensor has a silicon-based area sensor, a sensor area, and an electrically conductive contact region arranged laterally adjacent to the sensor area and configured to be touched upon the contact area being touched by a finger in order to bring the finger to a predetermined potential. The antenna is coupled to the fingerprint sensor to inductively couple the fingerprint sensor to a booster antenna.