Capacitive Handgrip Gesture Input for False Unlock Prevention
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Solution Overview
Problem
Existing door handgrip systems often experience erroneous detection when a hand is simply moved close to the handgrip, leading to unintentional unlocking of doors.
Innovation Solution
An operation input device with detecting electrodes and a determining unit that differentiate between a stopping state and a gesture operation by analyzing changes in capacitance values between electrodes, reducing erroneous detection by combining a stopping state with a gesture operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a door handgrip system detects hand presence by capacitance changes, then the door can be unlocked by simply moving a hand close to the handgrip, but erroneous detection occurs leading to unintentional unlocking
Solution Approach 1:
The detecting electrodes are divided into multiple regions (first detecting electrode and second detecting electrode) with different capacitance characteristics. This segmentation allows the system to analyze spatial distribution of capacitance changes and distinguish between intentional gestures and unintentional hand movements, resolving the contradiction between ease of operation and detection accuracy.
Solution Approach 2:
The patent introduces a temporal dimension by requiring both a stopping state (hand held stationary) and a gesture operation (hand moved). This two-stage requirement adds a time-based dimension to the detection process, enabling the system to differentiate between intentional gestures (which involve deliberate movement after positioning) and unintentional movements (which lack this structured temporal pattern), thereby improving reliability while maintaining ease of operation.
2Productivity
If the door handgrip responds to any hand movement, then door access is simplified, but false unlocking occurs due to unintentional gestures
Solution Approach 1:
The system requires a preliminary stopping state where the hand is held stationary before the gesture operation is executed. This preliminary action serves as a confirmation step that filters out unintentional movements, ensuring that only deliberate gestures trigger door unlocking, thus eliminating false unlocking while preserving efficient door access.
Solution Approach 2:
The determining unit continuously monitors capacitance changes and provides feedback by analyzing both the stopping state and subsequent gesture operation. This feedback mechanism allows the system to validate the intent behind hand movements and only trigger unlocking when the pattern matches an intentional gesture, preventing erroneous detection while maintaining high door access efficiency.
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 minimizes unintentional erroneous operations on sliding doors by accurately distinguishing between hand presence and gesture operations, thereby preventing unnecessary unlocking.
Implementation Method 1
a detecting unit configured to detect a capacitance that occurs between each of the detecting electrodes and an operating body when the operating body is brought close to the substrate
Data Source
AI summary
Operation input device with few gesture operation erroneous detections is provided. Operation input device includes substrate; plurality of detecting electrodes provided on substrate surface; detecting unit detecting capacitance occurring between each detecting electrode and operating body upon operating body being brought close to substrate; and determining unit determining whether gesture operation by operating body has been performed. Detecting electrodes include first and second electrodes of which capacitance values decrease/increase to match amount of movement of operating body when operating body is moved in longer direction. Upon sensing of operation of moving operating body after being stopped relative to detecting electrodes, or operation of stopping operating body after being moved relative to detecting electrodes, gesture operation by operating body is determined to have been performed. Operating body is determined to be stopped when changes in sum of, and ratio between, capacitance values of first and second electrodes are ≤predetermined values.