Waterproof Touch Keypad Structure for Skimmer Detection
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Solution Overview
Problem
Existing touch sensor keypads are vulnerable to skimming devices in outdoor environments, particularly at ATMs and unattended payment systems, and lack waterproofing and functionality with gloves, making them susceptible to data theft and operational interference from moisture.
Innovation Solution
A capacitive touch sensor keypad system with a sealed design incorporating a base layer, spacer board, and top layer with conductive traces, where the top layer deflects to create a change in capacitance when pressed, allowing for skimmer detection and operation with gloves, while maintaining waterproofing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional touch sensor keypad is used in outdoor environments, then it provides basic touch functionality, but it becomes vulnerable to moisture damage and skimming device attacks
Solution Approach 1:
The touch sensor keypad is designed to perform multiple functions simultaneously: basic touch input, waterproofing, and skimmer detection. The sealed enclosure protects against moisture while integrated electrodes detect skimming devices, allowing a single device to replace what would otherwise require separate protective measures and detection systems.
Solution Approach 2:
The patent combines the waterproof enclosure structure with skimmer detection functionality by integrating detection electrodes directly into the sealed housing. The base layer, spacer board, and top layer are merged into a unified sealed structure that simultaneously provides environmental protection and security monitoring capabilities.
2Reliability
If the keypad is sealed to prevent moisture entry, then waterproofing is achieved, but skimmer detection capability may be compromised
Solution Approach 1:
The detection electrodes are strategically positioned in specific locations on the sealed enclosure - on the exterior surface and within the sealed structure - to detect skimmers without compromising the waterproof seal. This localized electrode placement allows the majority of the enclosure to remain fully sealed while providing targeted detection zones for security monitoring.
3Ease of operation
If the keypad allows operation with gloves, then usability in cold weather is improved, but capacitive sensing may be interfered with by non-conductive materials
Solution Approach 1:
The system uses an intermediary detection method that senses changes in the electrical properties of the enclosure itself rather than relying solely on direct finger capacitance. The electrodes detect the presence of conductive skimmer devices attached to the enclosure surface, providing an indirect detection mechanism that works through non-conductive glove materials while maintaining measurement precision.
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 system effectively detects skimming devices and operates in wet conditions, ensuring user confidentiality and functionality with non-conductive materials like gloves, providing enhanced security and reliability.
Implementation Method 1
the top layer includes a plurality of parallel drive electrodes that are co-planar but perpendicular to a direction of the sense electrodes. Intersections of the sense electrodes and the drive electrodes form switches, wherein each of the plurality of apertures in the spacer board layer and each of the buttons on the overlay are disposed at each of the intersections that a button is desired. A deflection of the top layer over any of the plurality of apertures that is over an intersection will result in a detectable change in capacitance at the intersection
Implementation Method 2
A deflection of the top layer over any of the plurality of apertures that is over an intersection will result in a detectable change in capacitance at the intersection and the identification of a button that is being pressed on the overlay. The plurality of layers are sealed to prevent penetration of water
Data Source
AI summary
A system and method that combines skimmer detection technology with a waterproof and sealed touch sensor keypad that may be used outdoors in wet environments, and is capable of being operated by a user wearing gloves.