Variable-Width Capacitive Electrode for Press and Slide Recognition
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Solution Overview
Problem
Existing input devices with mechanical switches are prone to defects due to contamination, and electrostatic sensors with multiple electrodes require complex arrangements to distinguish between pressing and sliding operations.
Innovation Solution
An input device featuring a single electrode with a changing width dimension, generating distinct output signals for pressing and sliding operations, allowing for easy recognition of these actions using a simple arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple electrodes are arranged to detect sliding operations, then the detection capability is improved, but the device complexity increases
Solution Approach 1:
The single electrode is divided into multiple detection regions along its extension direction. Each region corresponds to a specific position when the finger slides across the electrode, allowing the system to detect sliding operations by monitoring changes in electrostatic capacity at different segments of the electrode rather than requiring multiple separate electrodes
Solution Approach 2:
The electrode is designed with a width dimension that changes along its extension direction. This dimensional variation creates distinct electrostatic capacity patterns for different sliding positions, enabling the system to detect sliding operations along one dimension using a single electrode structure rather than multiple electrodes arranged in space
2Ease of manufacture
If mechanical switches are used, then the ease of manufacture is improved, but the reliability deteriorates due to contamination
Solution Approach 1:
The patent replaces mechanical switches with an electrostatic sensor that detects finger approach and sliding operations through changes in electrostatic capacity. This substitution eliminates mechanical moving parts that are susceptible to dust and dirt contamination, thereby improving reliability while maintaining ease of manufacture through the use of solid-state sensing elements
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 effective recognition of pressing and sliding operations with a single electrode, simplifying the arrangement and improving reliability compared to multi-electrode systems.
Implementation Method 1
an output portion configured to generate an output signal an output value of which corresponds to an electrostatic capacity induced between the electrode and an electrically charged body when the electrically charged body approaches or touches the electrode
Data Source
AI summary
An input device including an electrode a width dimension of which changes in its direction of extension, an output portion an output signal of which corresponds to an electrostatic capacity induced between the electrode and an electrically charged body when the body approaches or touches the electrode, a detecting portion to detect a change of an output signal value of the output portion, and an operation recognizing portion configured to recognize, on the basis of the detected change of the output signal value, one of a pressing operation and a sliding operation of the body performed with respect to the electrode, wherein the pressing operation is performed by a moving action of the body in which the body approaches or touches the electrode, while the sliding operation is performed by a sliding action of the body in the direction of extension of the electrode while the body is held in close proximity to or in touch with the electrode.