Code Reader Magnetic Field Detection for Mode Switching
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Solution Overview
Problem
Existing code reading terminals face inefficiencies in determining whether an object is a printed code or an electronically displayed code, leading to degraded battery life and performance due to the need for manual switching and hit-and-trial methods.
Innovation Solution
The use of magnetic sensors to measure changes in the magnetic field, allowing the terminal to automatically switch between printed and electronically displayed code reading modes based on detected magnetic field changes, thereby optimizing image capture settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual switching or hit-and-trial methods are used to determine code type, then code reading capability is maintained, but battery life and terminal performance degrade
Solution Approach 1:
The system performs preliminary detection of magnetic field characteristics before image capture to determine code type. By measuring magnetic field strength and comparing it against threshold values in advance, the terminal automatically selects the appropriate imaging mode (printed code mode with illumination or electronically displayed code mode without illumination), eliminating the need for hit-and-trial attempts and conserving battery life.
2Reliability
If manual switching or hit-and-trial methods are used to determine code type, then code reading capability is maintained, but terminal performance degrades
Solution Approach 1:
The system performs preliminary detection of magnetic field characteristics before image capture to determine code type. By measuring magnetic field strength and comparing it against threshold values in advance, the terminal automatically selects the appropriate imaging mode (printed code mode with illumination or electronically displayed code mode without illumination), eliminating the need for hit-and-trial attempts and conserving battery life.
3Measurement precision
If different modes are used for imaging printed and electronically displayed codes, then imaging accuracy is improved, but device complexity increases
Solution Approach 1:
The terminal uses its own magnetic sensor to automatically detect the type of code being imaged and selects the appropriate imaging mode without external intervention. The system self-determines whether to use printed code mode (with illumination) or electronically displayed code mode (without illumination) based on magnetic field detection, eliminating the need for manual switches or complex external control mechanisms while maintaining high imaging accuracy for both code types.
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 approach enables efficient and automatic mode selection before image capture, reducing the need for hit-and-trial methods and conserving battery life by accurately distinguishing between printed and electronically displayed codes.
Implementation Method 1
measuring a magnetic field experienced at the electro-optical code reading terminal
Data Source
AI summary
An electro-optical code reading terminal for dynamically switching mode of operation from a printed code reading mode to an electronically displayed code reading mode is provided. The electro-optical code reading terminal measures and monitors, using one or more magnetic sensors, a magnetic field experienced at the electro-optical code reading terminal. When the electro-optical code reading terminal device determines that a change in the measured magnetic field exceeds a predetermined threshold within a predetermined time period, the electro-optical code reading terminal device infers presence of an electronically displayed code. The electro-optical code reading terminal device then switches its mode of operation from the printed code reading mode of operation to the electronically displayed code reading mode of operation.