Touch Sensor Sensitivity Adjustment for Gloved Operation
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Solution Overview
Problem
Existing touch sensors require users to remove hand covers in cold temperatures to interact effectively, as they are calibrated for bare fingers and fail to register insulated fingers, leading to inconvenient exposure to cold conditions.
Innovation Solution
A touch sensor assembly with a selectable sensitivity level, featuring a control unit that varies the threshold unrelated to environmental effects, allowing activation even when wearing hand covers by decreasing the sensitivity level when a condition such as low temperature is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the touch sensor threshold is set to activate upon contact with a bare human finger, then accurate detection of bare finger contact is achieved, but users wearing hand covers cannot activate the touch sensor
Solution Approach 1:
The touch sensor system dynamically adjusts the threshold value based on environmental conditions (temperature, humidity) and usage patterns. The controller monitors the operational environment and automatically modifies the threshold to accommodate either bare finger contact or insulated contact with hand covers, making the system adaptive to different user states without requiring manual intervention
Solution Approach 2:
The system changes the electrical parameter (threshold value) of the touch sensor based on detected environmental conditions and contact patterns. By adjusting the threshold parameter, the system can differentiate between low-capacitance bare finger contact and high-capacitance insulated contact, enabling accurate detection regardless of hand cover usage
2Ease of operation
If the touch sensor threshold is lowered to detect insulated fingers, then users wearing hand covers can activate the sensor, but misdetection increases for bare finger contact
Solution Approach 1:
The system continuously monitors touch sensor activations and environmental conditions, using this feedback to dynamically adjust the threshold. By analyzing patterns of contact and environmental data, the controller can determine whether to operate in a mode optimized for bare finger contact or insulated contact, thereby maintaining high reliability across different usage scenarios
Solution Approach 2:
The threshold is not fixed but dynamically adjusted based on real-time environmental conditions and usage patterns. This dynamic adjustment allows the system to optimize for either bare finger or hand cover usage depending on the current context, preventing both false positives and false negatives
3Adaptability or versatility
If the touch sensor is exposed to elements, then environmental adaptability is improved, but hand cover removal becomes necessary for operation
Solution Approach 1:
The system compensates for environmental effects by dynamically changing the threshold parameter based on temperature and humidity conditions. This allows the touch sensor to maintain accurate detection capabilities whether exposed to cold outdoor elements or warmer indoor environments, eliminating the need for users to remove hand covers in cold weather
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
Enables users to interact with touch sensors while wearing hand covers, overcoming the need to remove them and ensuring accurate activation in cold environments.
Implementation Method 1
The touch sensor detects a change in the electrostatic capacity and determines the presence or absence of contact (i.e., activation of the touch sensor) by comparing the detected value with a threshold value
Implementation Method 2
the touch sensor detects a value corresponding to the capacitance of the touch sensor
Implementation Method 3
the hand covering acts as an insulator between the touch sensor and the user's finger thereby significantly decreasing the body capacitance able to be sensed by the touch sensor
Data Source
AI summary
A touch sensor assembly having a selectable sensitivity level allows for a user to activate a touch sensor while wearing hand covers. The touch sensor assembly includes a touch sensor, a comparison unit, and a control unit. The touch sensor has a selectable sensitivity level, and detects a value corresponding to a capacitance of the touch sensor. The comparison unit has a predetermined threshold stored therein, and determines activation of the touch sensor if the detected value exceeds the predetermined value. The control unit is operable to select a sensitivity level of the touch sensor by varying the predetermined threshold by an amount unrelated to an environmental effect on the touch sensor.