Dual FOV Aiming Patterns for Rolling Shutter Barcode Scanners
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Solution Overview
Problem
Barcode scanners often face challenges in decoding barcodes due to inadequate illumination and unclear field of view guidance, leading to increased scanning times and errors, especially when targets are positioned at varying distances from the scanner.
Innovation Solution
The implementation of a multiple field of view aiming system that includes an illumination field source and a far field aiming source, along with near and far field optics, to provide visual guidance and illumination, indicating the field of view to the user, and utilizing a rolling shutter sensor to capture images without capturing laser light, allowing for efficient scanning at various distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single field of view is used for scanning, then the scanner can image targets at a specific distance, but it cannot scan targets at varying distances effectively
Solution Approach 1:
The patent implements a dynamic field of view system that can switch between near field and far field viewing modes. The imaging system adjusts its operational parameters based on target distance, enabling effective scanning at varying distances rather than being fixed at a single distance range.
Solution Approach 2:
The field of view is segmented into distinct near field and far field regions, each with optimized imaging characteristics. This segmentation allows the system to provide appropriate guidance and illumination for each distance range, improving adaptability to different scanning scenarios.
2Reliability
If no field of view guidance is provided, then the device is simpler, but scanning errors increase due to objects being outside or partially in the field of view
Solution Approach 1:
The patent employs visual guidance indicators that change or appear in specific field of view regions to guide users in positioning targets correctly. These visual cues help users understand whether objects are within the scannable area, reducing scanning errors.
Solution Approach 2:
Visual guidance elements act as intermediaries between the imaging system and the user, providing indirect information about field of view boundaries and target positioning. This mediator approach improves scanning reliability without requiring direct mechanical intervention.
3Measurement precision
If the target is too far from the scanner, then the scanner can capture the target in the field of view, but the image quality is insufficient for proper barcode decoding
Solution Approach 1:
The imaging system dynamically adjusts its characteristics based on target distance. For near field targets, the system optimizes for high-resolution imaging to ensure adequate image quality for barcode decoding, while maintaining awareness of far field capabilities.
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 enhances scanning efficiency by providing clear visual guidance for positioning targets within the scanner's field of view, reducing errors and scanning times, and enabling effective barcode decoding across different distances.
Implementation Method 1
The illumination source comprises a light emitting diode
Implementation Method 2
The far field aiming source comprises a laser diode
Implementation Method 3
near field optics configured to receive the illumination from the illumination field source and further configured to form the first illumination to provide near field illumination to the near field of view
Implementation Method 4
far field optics configured to receive the second illumination from the aiming source and further configured to provide the radiation pattern to the far field
Implementation Method 5
rolling shutter sensor disposed to receive light from the target and the rolling shutter sensor is configured to image the target
Data Source
AI summary
A system and methods for providing aiming guidance for an imaging system. The system includes an illumination field source configured to provide illumination along a illumination optical axis to (i) illuminate a target and (ii) indicate a near field of view of the imaging system and a far field aiming source configured to provide a radiation pattern along an aiming optical axis to indicate a far field of view of the imaging system. Near field optics are configured to receive the first illumination from the near field illumination source and to form the first illumination to provide illumination to, and indicate to a user or machine vision system, the near field of view of the imaging system, and far field optics are configured to receive radiation from the aiming source and provide the radiation pattern to the far field to indicate the far field of view of the imaging system.