Sealed Capacitive Touch Keypad for Gloved Use and Skimmer Detection
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Solution Overview
Problem
Existing touch sensor keypads used in outdoor environments, such as ATMs and gas pumps, are vulnerable to skimming devices and lack waterproofing, making them susceptible to moisture and debris interference, while also being inaccessible to users wearing gloves.
Innovation Solution
A capacitive touch sensor keypad system with a sealed design incorporating a base layer, spacer board, and top layer, where the top layer deflects to create a change in capacitance when pressed, allowing operation with gloves and detecting skimming devices by altering the electric field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a touch sensor keypad is used in outdoor environments, then it provides user interaction capability, but it becomes vulnerable to moisture and debris interference
Solution Approach 1:
The patent applies a waterproof membrane or coating over the touch sensor keypad surface, creating a protective barrier that prevents moisture and debris from penetrating to the sensitive electronic components while still allowing capacitive touch input to function through the protective layer
Solution Approach 2:
The patent replaces traditional mechanical keypads with capacitive touch sensors that have no moving parts or physical gaps, eliminating entry points for moisture and debris while maintaining full user interaction capability through electrical field sensing
2Reliability
If the keypad is sealed to prevent moisture ingress, then waterproofing is improved, but access for users wearing gloves deteriorates
Solution Approach 1:
The patent uses a flexible waterproof membrane with specific capacitive properties that allows the electrical field from gloved fingers to penetrate through the sealing layer and be detected by the touch sensors, maintaining both waterproofing and gloved operation capability
Solution Approach 2:
The patent adjusts the capacitive sensitivity parameters of the touch sensor system to compensate for the insulating properties of gloves, ensuring that the electrical field changes caused by gloved finger contact remain detectable above the noise threshold
3Reliability
If skimmer detection capability is added to the keypad, then security is improved, but device complexity increases
Solution Approach 1:
The patent implements skimmer detection by utilizing the existing capacitive touch sensor electrodes and control circuitry for a secondary function: detecting abnormal capacitive patterns that indicate the presence of skimming devices, thereby achieving security enhancement without adding separate detection hardware
Solution Approach 2:
The patent incorporates feedback mechanisms where the touch controller continuously monitors capacitive values and compares them against expected ranges, automatically detecting and reporting skimmer presence through the existing communication interface without requiring additional processing complexity
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 provides waterproofing and skimmer detection, enabling operation in harsh weather conditions and with non-conductive materials, while maintaining sensitivity and accuracy.
Implementation Method 1
the top layer deflects to create a change in capacitance when pressed
Implementation Method 2
A capacitive touch sensor keypad system with a sealed design incorporating a base layer, spacer board, and top layer
Implementation Method 3
detecting skimming devices by altering the electric field
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.