Optical Door Lock Gesture Detection for Gloved Hands
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Solution Overview
Problem
Current capacitive touch door handles are ineffective when used with leather gloves or when wet, and they lack off-surface gesture recognition, making keyless entry systems less reliable and limited in functionality.
Innovation Solution
A light-based proximity sensor system using a one-dimensional array of alternating light emitters and detectors, which projects collimated light beams and detects reflections to determine object location and movement, enabling two-dimensional touch detection and three-dimensional hover detection without the need for extensive component placement around the entire screen or surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If capacitive touch door handles are used, then touch functionality is provided, but they become ineffective when used with leather gloves or when wet
Solution Approach 1:
The patent replaces capacitive touch detection with optical detection using light emitters and detectors. The optical sensor detects gestures by measuring light reflections and interruptions, which work reliably through leather gloves and wet conditions unlike capacitive sensors that depend on electrical conductivity of the human body.
Solution Approach 2:
The system changes the detection parameter from electrical capacitance to optical properties (light reflection and interruption). By using light-based detection instead of electrical field detection, the system achieves consistent performance across different hand conditions including gloves and wet surfaces.
2Adaptability or versatility
If capacitive touch door handles are used, then basic touch functionality is provided, but they lack off-surface gesture recognition
Solution Approach 1:
The patent extends gesture detection from surface-level touch (2D) to off-surface hover detection (3D). By placing light emitters and detectors in arrays and measuring light path interruptions at multiple depths, the system can detect gestures occurring in the air above the door handle surface, enabling more versatile interaction modes.
3Adaptability or versatility
If light-based proximity sensor system with one-dimensional array is used, then two-dimensional and three-dimensional touch detection is enabled, but component placement complexity is reduced
Solution Approach 1:
The patent achieves 2D and 3D detection capabilities using a 1D array of sensors by utilizing the temporal and spatial characteristics of light reflections. Instead of requiring dense 2D sensor arrays, the system uses a linear array with optical processing to extract depth and position information from reflected light patterns, reducing component count and placement 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
This solution provides reliable two-dimensional and three-dimensional touch detection, improving the functionality of keyless entry systems by functioning effectively with various hand coverings and allowing for off-surface gesture recognition, reducing component requirements and costs.
Implementation Method 1
The light detectors detect light from the emitters that has been reflected by an object inserted into the light beam path
Data Source
AI summary
A user interface method for an automated door lock, including providing a sensor operable to identify two-dimensional locations of an object within a detection plane that extends outward from a door, providing an unlocker operative to automatically unlock the door, identifying, by a processor coupled with the sensor and the unlocker, a linear movement of the object within the detection plane, in a first direction of motion, further identifying, by the processor, a linear movement of the object within the detection plane, in a second direction of motion substantially orthogonal to the first direction of motion, and activating, by the processor, the unlocker in response to the identifying and the further identifying.