Electrostatic Contact Sensing Across Regions at Startup
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Solution Overview
Problem
Conventional contact detection devices using capacitance sensors struggle to accurately detect human contact at startup, as the initial reference value is often set with a hand already touching the interface, leading to inaccurate readings.
Innovation Solution
A contact detection apparatus featuring an electrostatic sensor with multiple detection regions and a determination processor that sets a reference value for each region during an initial process, comparing capacitance values to determine contact or non-contact based on threshold values, ensuring accurate detection even if a conductor is in contact at startup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the initial reference value is set during startup, then the device can begin operation quickly, but contact detection accuracy deteriorates when a hand is already touching the interface at startup
Solution Approach 1:
The detection interface is divided into multiple independent detection regions (first detection region, second detection region, etc.), each with its own capacitance measurement and reference value. This segmentation allows the system to identify which specific region is being touched and use appropriate reference values for accurate detection.
Solution Approach 2:
The system performs preliminary actions by setting reference values for all detection regions before normal operation begins. During startup, the system measures capacitance values and establishes baseline reference values for each region, ensuring that accurate contact detection is enabled from the moment the device becomes operational.
Solution Approach 3:
The system continuously monitors capacitance values in each detection region and compares them against stored reference values. When a contact is detected, the system provides feedback by identifying the touched region and can update reference values based on the detected state, enabling adaptive and accurate contact detection throughout operation.
2Measurement precision
If multiple detection regions are monitored independently, then contact detection accuracy improves, but device complexity increases
Solution Approach 1:
The determination processor serves multiple functions: it measures capacitance values, compares them against reference values, identifies touched detection regions, and updates reference values as needed. This multi-functionality allows the system to achieve accurate contact detection across multiple regions without proportionally increasing hardware complexity.
Solution Approach 2:
The system monitors changes in capacitance parameters across different detection regions. By detecting parameter changes (capacitance variations) and comparing them against reference values, the system can accurately identify contact events while using a unified processing approach that manages complexity.
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 accurate detection of conductor contact by setting appropriate reference values, improving the reliability of contact detection and handling changes over time or environmental factors.
Implementation Method 1
an electrostatic sensor 7 having a plurality of detection regions 22 with which a conductor comes into contact; and a determination processor detecting whether the conductor is in contact with the plurality of detection regions based on a capacitance equivalent value of each of the plurality of detection regions
Data Source
AI summary
A contact detection apparatus includes an electrostatic sensor, and a determination processor detecting whether a conductor comes into contact with a plurality of detection regions. The determination processor includes a storage unit, a determination reference value setting unit, and a determination processing unit. The determination reference value setting unit determines a detection region in which a difference between a capacitance equivalent value and a setting reference value exceeds a threshold value as a contact region where the conductor is in contact, determines a detection region in which the difference is equal to or less than the threshold value as a non-contact region where the conductor is not in contact, and sets the setting reference value corresponding to the non-contact region as a determination reference value of the contact region for the contact region when determining that the contact region exists and that the non-contact region exists.