Detachable Fingerprint Sensor with Integrated Terminals
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Solution Overview
Problem
Capacitance type fingerprint sensors face durability issues due to the fragility of dielectric thin films, which are prone to damage from friction and degradation, leading to low durability and increased maintenance costs.
Innovation Solution
A detachable fingerprint sensor design with integrated metal terminals in both the sensor and case members, allowing for easy replacement of the sensor module while maintaining electrical connectivity, reducing the number of terminals needed and preventing voltage drop, and incorporating detection, driving, and amplifier circuits within the sensor module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dielectric thin film is formed on the detection surface to enable capacitance-based fingerprint detection, then fingerprint sensing capability is achieved, but the dielectric thin film becomes prone to damage from friction and degradation, reducing durability
Solution Approach 1:
The invention divides the fingerprint sensor into a detachable sensor module that can be separated from the case member. This segmentation allows the fragile dielectric thin film to be protected within the sensor module while enabling easy replacement when damaged, thus maintaining sensing capability without compromising durability.
Solution Approach 2:
The detachable sensor module design enables the dielectric thin film to be discarded and replaced when damaged, rather than being permanently fixed. The sensor module can be recovered and reused in another device, extending the overall system lifespan while maintaining reliable fingerprint sensing.
2Ease of repair
If the fingerprint sensor is made detachable to improve replaceability, then maintenance cost is reduced, but electrical connection reliability may be compromised
Solution Approach 1:
The invention combines multiple functions into the detachable sensor module: fingerprint detection, electrical connection terminals, and positioning features. This merging ensures that when the module is detached and reattached, all electrical connections and positioning are restored simultaneously, maintaining connection reliability while enabling easy replacement.
Solution Approach 2:
The case member acts as an intermediary that provides both electrical connection terminals and positioning structures. This intermediary component ensures stable electrical contact and precise positioning when the sensor module is reattached, maintaining connection reliability independent of the sensor module's condition.
3Device complexity
If multiple circuit parts are integrated in the case member to reduce terminal count, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The invention segments the circuit architecture by placing driving and amplifier circuits within the sensor module rather than in the case member. This segmentation reduces the number of terminals needed in the case member and eliminates complex alignment requirements, as the sensor module's internal circuits are self-contained and require only simple external connections.
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 design enhances the reliability of electrical connections, reduces manufacturing costs, and allows for precise positioning, enabling cost-effective and efficient fingerprint authentication with improved sensitivity and durability.
Implementation Method 1
The capacitance type fingerprint sensor detects a fingerprint pattern by determining capacitance which varies due to a distance between the fingerprint having concavity and convexity and a detection surface
Implementation Method 2
a dielectric thin film having a thickness of about 200-500 mm is formed on the detection surface to which the fingerprint contacts
Data Source
AI summary
An identity authentication device including a case member, a fingerprint sensor member being detachable from the case member, a first metal terminal formed in the finger print sensor member and a second metal terminal formed in the case member and electrically connectable with the first metal terminal.