Electrostatic Input Device with Start-Position Slide Filtering
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Solution Overview
Problem
Existing electrostatic input devices fail to accurately detect and process repeated sliding operations in a single direction due to capacitance detection in unintended directions when the user releases and returns the operation body, leading to incorrect output.
Innovation Solution
The electrostatic input device employs a plurality of electrostatic sensor electrodes, a measurement circuit, and a control unit to calculate and store the start position of the operation body, determining the direction and amount of movement by subtracting a reference value from measured capacitance, and excluding opposite direction movements to ensure accurate direction detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the user releases and returns the operation body in the opposite direction, then the operation body can be repositioned, but the capacitance in the opposite direction is detected causing incorrect output
Solution Approach 1:
The control unit stores the position of the electrostatic sensor electrode close to the operation body as a start position before the sliding operation begins. This preliminary action establishes a reference point that allows the system to distinguish between intentional sliding movements and return movements, thereby preventing incorrect output while allowing easy repositioning of the operation body.
2Measurement precision
If the capacitance of the operation body is detected during return movement, then the operation body position can be detected, but the sliding operation cannot be performed appropriately
Solution Approach 1:
The control unit continuously monitors the capacitance correction value and compares it with the stored start position. When the operation body returns to a position close to the start position, the system detects this through capacitance feedback and prevents incorrect sliding operation output. This feedback mechanism maintains measurement precision while ensuring appropriate sliding operation responsiveness by filtering out spurious return movements.
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 approach allows for precise calculation of the intended sliding operation direction and amount, preventing incorrect volume adjustments despite user intent, thereby enhancing the accuracy of electrostatic input devices.
Implementation Method 1
a measurement circuit configured to measure a capacitance between each of the plurality of electrostatic sensor electrodes and an operation body
Data Source
AI summary
An electrostatic input device includes a plurality of electrostatic sensor electrodes arrayed in one direction, a measurement circuit configured to measure a capacitance between each of the plurality of electrostatic sensor electrodes and an operation body, a storage unit, and a control unit configured to calculate a position of the operation body based on a capacitance correction value obtained by subtracting a reference value from the capacitance measured by the measurement circuit, determine whether the operation body is close to at least one of the plurality of electrostatic sensor electrodes based on the capacitance correction value, and calculate a direction of movement and an amount of movement of the operation body.