Detection Device Using Multiple Threshold Levels for Proximity Accuracy
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Solution Overview
Problem
Existing detection systems face accuracy issues in proximity detection due to signal overload when the distance between the detection surface and the object is too short, leading to deteriorated coordinate detection accuracy.
Innovation Solution
A detection device with a sensor arrayed in a matrix configuration, utilizing a processing circuit that generates spatial coordinates by applying different thresholds to detection values from electrodes, allowing for accurate detection of object positions both on and above the detection region, including orthogonal coordinates, to enhance sensitivity and prevent signal overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distance between the detection surface and the object to be detected is too short, then sensitivity is enhanced, but detection signals may exceed the maximum value detectable by the detection circuit, deteriorating the accuracy of acquiring the detection coordinates
Solution Approach 1:
The patent segments the detection value range by introducing multiple threshold values (first threshold, second threshold, third threshold) that divide the detection value spectrum into distinct regions. This segmentation allows the system to handle different signal强度 levels appropriately, preventing signal overload from deteriorating coordinate detection accuracy while maintaining high sensitivity for close objects
Solution Approach 2:
The patent changes the parameter of threshold values from a single fixed value to multiple variable thresholds (first, second, and third thresholds) that can be selectively applied based on detection conditions. This parameter change enables the system to adapt to varying signal levels, ensuring accurate coordinate detection whether objects are close to or far from the detection surface
2Adaptability or versatility
If a single threshold is used for detection values, then the detection circuit design is simplified, but accurate detection of objects at varying distances (both close proximity and contact) cannot be achieved simultaneously
Solution Approach 1:
The patent introduces dynamic threshold selection where the processing circuit selectively applies different thresholds (first, second, or third threshold) based on the detection value magnitude and detection conditions. This dynamic approach enables the system to accurately detect objects at varying distances while maintaining manageable processing complexity through systematic threshold application rules
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
The solution effectively reduces accuracy deterioration in proximity detection by using threshold-based processing to extract precise spatial coordinates, even when objects are close to or in contact with the detection surface, thereby improving detection accuracy across varying distances.
Implementation Method 1
there is a configuration that is provided with a plurality of electrodes in the detection region and that detects capacitance generated in each of the electrodes to detect the spatial coordinates of the position where the object to be detected is present on or above the detection region
Data Source
AI summary
A detection device includes: a sensor having a detection region; electrodes arrayed in a first direction and a second direction in the detection region; a detection circuit configured to generate detection values of the electrodes based on detection signals from the electrodes; and a processing circuit configured to generate spatial coordinates indicating a position of an object to be detected on or above the detection region. The spatial coordinates include first data indicating a position in the first direction, second data indicating a position in the second direction, and third data indicating a position in a third direction. The processing circuit acquires the first to third data based on the detection values and generates the spatial coordinates when at least one of the detection values is equal to or larger than a first threshold and smaller than a second threshold larger than the first threshold.