Touch Input Force Thresholding for Half-Press and Full-Press Detection
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Solution Overview
Problem
Existing input check devices in electrical equipment struggle to accurately differentiate between the 'half-press' and 'full press' operations, leading to inefficiencies in determining the ON/OFF state of operating parts, particularly when the pressure changes are subtle.
Innovation Solution
An input check device equipped with a coordinate detection part, a pressing force detection part, and an identifying part that sets and compares thresholds to determine the ON/OFF state based on the minimum and peak pressing forces, allowing for precise identification of the operating part's mode transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed pressure threshold is used to differentiate half-press and full press operations, then the device complexity is reduced, but the measurement precision of pressing force differentiation deteriorates
Solution Approach 1:
The patent applies dynamics by transitioning from a static fixed threshold to a dynamic adaptive threshold that automatically adjusts based on detected pressing force patterns. The system learns the relationship between half-press and full press forces through actual usage, continuously optimizing the threshold value to accurately differentiate between operation types while maintaining simple implementation.
Solution Approach 2:
The patent implements parameter changes by modifying the threshold parameter from a predetermined fixed value to a dynamically adjusted value based on detected pressing force characteristics. The system calculates the ratio between full press and half press forces, then adjusts the threshold parameter accordingly to improve differentiation precision without increasing device complexity.
2Ease of operation
If a predetermined fixed threshold is used for determining ON/OFF states, then the ease of operation is improved, but the reliability of operation detection deteriorates when pressure changes are subtle
Solution Approach 1:
The patent implements feedback by using the detected pressing force information to continuously refine and adjust the threshold value. The system monitors the relationship between half-press and full press forces, feeds this information back to update the threshold parameter, and thereby improves reliability in detecting subtle pressure changes while maintaining ease of operation through automatic adaptation.
Solution Approach 2:
The patent applies preliminary action by pre-learning the pressing force characteristics during initial usage to establish an accurate threshold before actual operation detection begins. The system performs preliminary detection to understand the user's pressing patterns, then uses this learned information to reliably differentiate between operation types from the start of normal use.
3Measurement precision
If the threshold is set based on minimum pressing force detection, then the measurement precision of operation differentiation is improved, but the time required for accurate detection increases
Solution Approach 1:
The patent applies preliminary action by detecting and storing the minimum pressing force value during an initial calibration phase before actual operation detection begins. This pre-detected minimum value is then used as a reference point for rapid threshold calculation during subsequent operations, achieving high precision differentiation without time loss during actual use.
Solution Approach 2:
The patent implements dynamics by creating a dynamic threshold calculation method that uses the pre-detected minimum pressing force as a baseline. The system dynamically adjusts the threshold based on the ratio between full press and minimum press forces, enabling rapid and precise operation differentiation without requiring extended detection time during actual operations.
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 solution enhances the operability of electrical equipment by accurately identifying the ON/OFF states and confirming selections early, improving the overall user interface experience through precise detection of pressing force thresholds.
Implementation Method 1
a piezoelectric element that detects changes of pressure loads on the operating part
Data Source
AI summary
An input check device includes a coordinate detection part configured to detect coordinates of a touch operation a user performs on an operating surface when operating an operating part through the operating surface; a pressing force detection part configured to detect a pressing force of the touch operation; and an identifying part configured to determine whether the operating part is ON or OFF based on the pressing force detected in the pressing force detection part, and, after determining that the operating part is switched from ON mode to OFF mode, the identifying part detects a minimum value of the pressing force; and the identifying part determines that the operating part is switched from OFF to ON when, following the detection of the minimum value, the pressing force surpasses a predetermined threshold that is set based on the minimum value and that is greater than the minimum value.