Wearable Barcode Reader With Motion Trigger and Rest-Phase Detection
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Solution Overview
Problem
Existing barcode scanners face issues with ergonomics and efficiency in high-volume scanning scenarios, including time-consuming touchscreen activation, risk of carpal tunnel syndrome from trigger button use, and unreliable movement-based triggering mechanisms.
Innovation Solution
A barcode scanner integrated with an accelerometer and optionally a gyroscope, attached to the user's hand, triggers the reading head upon detecting a specific movement pattern of acceleration followed by a rest phase, allowing for reliable and efficient scanning without manual button presses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the scanner is triggered by pressing a trigger button, then the scanning speed is improved, but the user develops carpal tunnel syndrome or tendon irritation
Solution Approach 1:
The patent replaces the mechanical trigger button pressing action with an accelerometer-based motion detection system. The scanner automatically detects hand movements through acceleration measurements and triggers scanning without requiring the user to press any buttons, thereby eliminating the harmful repetitive strain on tendons while maintaining high scanning speed.
Solution Approach 2:
The scanner performs self-triggering by automatically detecting its own motion through the integrated accelerometer. The system monitors its own movement patterns and autonomously initiates scanning when the characteristic motion pattern is detected, eliminating the need for separate manual triggering by the user.
2Speed
If the scanner reading head is kept constantly ready to read, then the scanning response time is improved, but the battery discharges too quickly
Solution Approach 1:
Instead of keeping the reading head constantly active, the system uses periodic motion detection to trigger scanning only when needed. The accelerometer continuously monitors for specific motion patterns, and the reading head is activated only during these detected periods, creating an on-demand operation mode that reduces overall energy consumption while maintaining quick response when motion is detected.
Solution Approach 2:
The accelerometer continuously monitors for motion patterns in advance, detecting the user's intent to scan before the actual scanning needs to occur. This preliminary detection allows the system to prepare and trigger the reading head at the optimal moment, ensuring fast response time without requiring the reading head to remain constantly active.
3Ease of operation
If the scanner is triggered by a specific movement pattern, then the ease of operation is improved, but false triggers occur due to everyday movements
Solution Approach 1:
The system uses multiple parameters from the accelerometer data (acceleration magnitude, direction, duration, and temporal pattern) to define the trigger condition. By requiring a specific combination of these parameters to match the predetermined motion pattern, the system achieves high sensitivity to intended scanning gestures while maintaining immunity against unrelated everyday movements that don't match the full parameter set.
Solution Approach 2:
The system continuously monitors accelerometer data and provides real-time feedback by comparing current motion patterns against the predetermined trigger pattern. This continuous feedback mechanism allows the system to distinguish between intentional scanning gestures and incidental movements, triggering only when the feedback confirms a match across all monitored parameters.
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 ergonomic and efficient scanning by eliminating the need for manual activation, reducing fatigue, and minimizing false triggers, particularly suitable for high-volume scanning tasks.
Implementation Method 1
The accelerometer measures the accelerations that occur when the hand is moved.
Implementation Method 2
The read head unit, the controller, the accelerometer, and the optional gyroscope are all conveniently integrated into a single housing
Data Source
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AI summary
Barcode scanner with at least one read head unit and means for attaching the at least one read head unit to a hand and/or arm of the user, as well as a control unit and an accelerometer that measures the accelerations that occur during the movement of the hand (whether hand alone or hand with arm), wherein the barcode scanner is configured to cause the read head unit to scan as soon as the scanner measures an acceleration that exceeds a first limit acceleration, and a subsequent first rest phase in which the hand is essentially at rest.