Touch Operation Panel With Adaptive Threshold Switching
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Solution Overview
Problem
Existing operation panels struggle to accurately detect user input on switches due to variations in finger size, leading to inconsistent operation feelings and detection accuracy for users with different finger sizes.
Innovation Solution
An operation panel that adjusts threshold values based on the detected contact area, using a control unit to set variable threshold values for switch operation detection, ensuring accurate detection regardless of finger size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a small threshold value is set for switch operation detection, then users with large fingers can easily operate the panel, but users with small fingers may experience simultaneous switching with contact
Solution Approach 1:
The patent applies dynamics by making the threshold value variable rather than fixed. The control unit dynamically adjusts the threshold based on the detected contact area magnitude. When the contact area is small (users with small fingers), a smaller threshold is used; when the contact area is large (users with large fingers), a larger threshold is used. This dynamic adjustment resolves the contradiction between ease of operation for large-fingered users and detection accuracy for small-fingered users.
Solution Approach 2:
The patent changes the parameter of the threshold value from a constant to a variable that depends on the contact area. The control unit determines the magnitude of the contact area and sets the threshold accordingly. This parameter change allows the system to adapt to different finger sizes, ensuring accurate detection regardless of whether the user has large or small fingers.
2Reliability
If a large threshold value is set for switch operation detection, then false switching is prevented for users with large fingers, but users with small fingers cannot exceed the threshold and the switch may not activate
Solution Approach 1:
The system dynamically adjusts the threshold based on contact area magnitude. For users with small fingers who generate smaller contact areas, a smaller threshold is applied, allowing them to successfully activate the switch. For users with large fingers who generate larger contact areas, a larger threshold is applied, preventing false switching while still allowing intentional operations. This dynamic behavior resolves the contradiction between reliability and ease of operation.
Solution Approach 2:
The threshold parameter is changed from a fixed value to a variable that adapts to the user's finger size through contact area measurement. The control unit selects different threshold values based on the detected contact area magnitude, ensuring that the threshold is appropriate for each user's physical characteristics. This resolves the contradiction by making the system reliable for large-fingered users while remaining accessible to small-fingered users.
3Device complexity
If a fixed threshold value is used for all users, then the system is simple to implement, but it cannot accurately detect operations for users with different finger sizes
Solution Approach 1:
The system performs self-adjustment by automatically determining the contact area magnitude and selecting an appropriate threshold value without requiring manual configuration. The control unit autonomously adapts to each user's finger size based on real-time contact area measurements, eliminating the need for complex pre-programming or manual threshold setting for different user types while maintaining high detection accuracy.
Solution Approach 2:
The system uses feedback from the contact area detection to adjust the threshold value. The sensor unit detects the contact area, the control unit determines its magnitude, and based on this feedback, selects an appropriate threshold. This closed-loop feedback mechanism allows the system to automatically adapt to different finger sizes without increasing device complexity, resolving the contradiction between simplicity and accuracy.
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 solution enables precise detection of switch operations, providing consistent operation feelings and improved accuracy across different finger sizes by dynamically setting threshold values based on contact area measurements.
Implementation Method 1
a sensor unit configured to output an electrical signal corresponding to a contact area between a finger of the user and the switch unit
Data Source
AI summary
An operation panel includes a touch position sensor configured to output an electrical signal corresponding to a contact area between a finger of a user and a switch and a controller to which an electrical signal is input from the touch position sensor. The controller is configured to: determine that the finger of the user and the touch position sensor are in contact with each other when the calculation value calculated based on the electrical signal input from the touch position sensor exceeds the preset first threshold value, and set, based on the calculation value, the second threshold value larger than the first threshold value in accordance with a magnitude of the calculation value; and determine that the touch position sensor is in the operation state of being operated when the calculation value exceeds the second threshold value.