Hybrid Laser-Imager Barcode Reader with Interference Control
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Solution Overview
Problem
Existing barcode readers, particularly imager-based ones, face limitations in ergonomic design for handheld mode, struggle with reading two-dimensional symbols, and lack visual guidance for positioning symbols correctly, leading to inefficiencies and potential errors in scanning.
Innovation Solution
A hybrid reader with a gun-shaped housing and pivotable base, featuring a dual module setup with a solid-state imager and laser scanning module, controlled by a controller to prevent interference and provide visual indication of the field of view, enabling effective reading of one- and two-dimensional symbols in both hands-free and handheld modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an imager-based reader is designed for hands-free mode, then it can read one- and two-dimensional symbols effectively, but it fails ergonomically in handheld mode due to housing design
Solution Approach 1:
The reader is divided into two functional modules: a laser scanning module for one-dimensional symbols and an imager module for two-dimensional symbols. Each module can operate independently, allowing the device to optimize performance for different symbol types while maintaining a unified housing structure that supports both handheld and hands-free modes effectively.
Solution Approach 2:
The housing is designed with universal ergonomics that accommodate both handheld and hands-free operation modes. The trigger mechanism serves dual purposes: initiating laser scanning in handheld mode and coordinating imager operation in hands-free mode. This multi-functional design eliminates the need for mode-specific housing variations while maintaining ease of operation across both modes.
2Adaptability or versatility
If a moving laser beam-based reader is used, then it works well in handheld mode for one-dimensional symbols, but it cannot read certain two-dimensional symbols
Solution Approach 1:
The patent merges a laser scanning module and an imager module into a single integrated reader system. The laser module handles one-dimensional barcodes with its precise line scanning capability, while the imager module captures two-dimensional data matrices and other complex symbols. Both modules share common housing, power supply, and control circuitry, achieving enhanced symbol type coverage without proportionally increasing device complexity.
Solution Approach 2:
The reader is designed as a universal scanning device that can read both one-dimensional barcodes and two-dimensional data matrices. The system automatically detects the symbol type and activates the appropriate module, providing versatile symbol coverage across different industries and applications while maintaining a single unified device structure.
3Measurement precision
If an imager-based reader is used in hands-free mode, then it can capture symbols, but it lacks visual guidance for positioning symbols correctly
Solution Approach 1:
The system incorporates visual feedback through LED indicators that show the imager's field of view boundaries and symbol detection status. During hands-free operation, these indicators provide real-time feedback to operators about symbol positioning accuracy, allowing immediate correction without requiring complex camera-based visualization systems. The feedback mechanism enhances positioning precision while adding minimal device complexity.
4Productivity
If a laser scanning module and imager module operate simultaneously, then reading coverage is maximized, but reading interference occurs between modules
Solution Approach 1:
The system employs periodic operation where the laser scanning module and imager module take turns activating based on symbol type detection. The controller rapidly switches between modules in a periodic manner, with the laser module scanning for one-dimensional barcodes and the imager module capturing two-dimensional symbols. This time-division multiplexing approach maximizes reading throughput while preventing light interference that would compromise reading accuracy.
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 enhances ergonomic 'aim-and-shoot' functionality, improves reading accuracy for wide symbols like driver's licenses, and increases working distance range in handheld mode, reducing errors and improving scanning efficiency.
Implementation Method 1
The imager comprises an array of cells or photosensors, which correspond to image elements or pixels in a field of view of the imager
Implementation Method 2
A laser generates a laser beam directed to a symbol associated with a product for reflection and scattering from the symbol
Implementation Method 3
The illumination light source may be located within and/or externally of the reader, and comprises one or more light emitting diodes (LEDs)
Data Source
Figure 1~2
Figure 3~4
AI summary
An imaging module is supported by a housing of a reader for electro-optically reading indicia. The imaging module includes a solid-state imager having an array of image sensors for capturing return light from the indicia during reading. A laser scanning module is also supported by the housing and includes a scanner for scanning at least one of a laser beam from a laser and a field of view of a light detector in a scan pattern across the indicia during reading. A controller is operatively connected to the modules, and is operative for preventing reading interference between the modules during reading.