Capacitance Sensor Mode Switching for Contact and Approach Detection
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Solution Overview
Problem
Existing electrostatic capacitance detection devices are limited in detecting diverse modes of object contact or approach, restricting their functionality.
Innovation Solution
An electrostatic capacitance detection device with multiple detection modes, utilizing a control device that detects capacitance changes through different phases of electrostatic capacitance changes, including high-resolution and low-resolution detection modes, to accurately determine object presence and type based on capacitance change patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single detection mode is used to detect capacitance changes, then the device structure remains simple, but the ability to detect diverse contact and approach modes is restricted
Solution Approach 1:
The patent implements multiple detection modes (first detection mode and second detection mode) that dynamically switch between different capacitance change detection thresholds. The control device selects different detection modes based on the detected capacitance change amount, enabling the system to adapt to diverse contact and approach modes while maintaining a relatively simple overall structure.
2Measurement precision
If high-resolution detection mode is used for all cases, then detection precision is improved, but detection time and processing load increase
Solution Approach 1:
The patent applies partial high-resolution detection by using the first detection mode (high-resolution) only when the capacitance change amount exceeds a predetermined threshold, indicating actual contact. For normal approach detection, the second detection mode (lower resolution, faster) is used. This selective application of high-resolution detection maintains precision when needed while reducing detection time for routine monitoring.
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 precise detection of various contact and approach states with improved resolution and reduced erroneous determinations, allowing for efficient object recognition and gesture detection.
Implementation Method 1
An electrostatic capacitance detection device includes an electrostatic capacitance sensor and determines presence or absence of contact or approach of an object based on a change in electrostatic capacitance of the electrostatic capacitance sensor
Data Source
AI summary
An electrostatic capacitance detection device includes: an electrostatic capacitance sensor; and a control device that controls the electrostatic capacitance sensor, wherein the control device has a plurality of detection modes for detecting a capacitance change amount corresponding to a change amount of electrostatic capacitance of the electrostatic capacitance sensor, detects the capacitance change amount in each of the plurality of detection modes, and determines presence or absence of contact or approach of an object to the electrostatic capacitance sensor based on the capacitance change amount.