Linear Scanner Synchronization for Overexposure-Free Conveyor Imaging
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Solution Overview
Problem
Existing machine-readable symbol readers with overlapping fields of view often experience overexposure issues due to simultaneous illumination by multiple illuminators, leading to degraded image quality.
Innovation Solution
A system with multiple linear scanners and a controller that adjusts image acquisition based on conveyor speed, using synchronized triggers and speed-based modes to prevent overexposure by coordinating image capture across scanners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple linear scanners with overlapping fields of view are used to capture images of machine-readable symbols, then the coverage area and reading capability are improved, but overexposure occurs due to simultaneous illumination by multiple illuminators
Solution Approach 1:
The patent implements periodic action by alternating the operation of multiple illuminators in time-separated intervals. Each illuminator is activated only when its associated scanner is actively acquiring images, while other illuminators remain inactive. This periodic activation pattern prevents simultaneous illumination of the same area by multiple illuminators, thereby eliminating overexposure while maintaining comprehensive coverage through the coordinated operation of multiple scanners.
2Productivity
If multiple linear scanners operate simultaneously with overlapping fields of view, then image acquisition speed is improved, but synchronization issues cause overexposure and degraded image quality
Solution Approach 1:
The patent implements feedback mechanisms through a controller that receives encoder signals indicating conveyor speed and position. Based on this feedback information, the controller dynamically adjusts the triggering of individual scanners and the activation of illuminators to maintain proper synchronization. The system continuously monitors operational parameters and adjusts timing accordingly, ensuring that image acquisition is coordinated and that illuminators are activated only when needed, thus preventing overexposure while maintaining high acquisition speeds.
Solution Approach 2:
The patent applies dynamics by making the scanner triggering and illuminator activation adaptive to varying conveyor speeds. Rather than using fixed timing, the system dynamically adjusts acquisition parameters based on real-time encoder feedback. When conveyor speed changes, the controller modifies the timing and coordination of scanner triggers and illuminator activation accordingly, allowing the system to maintain optimal performance across different operating conditions without sacrificing image quality.
3Device complexity
If linear scanners use fixed triggering intervals, then synchronization is simplified, but image distortion occurs when conveyor speed varies
Solution Approach 1:
The patent implements dynamic adjustment of scanner triggering intervals based on real-time conveyor speed feedback from encoders. Rather than using fixed triggering intervals, the system continuously adapts the timing between scanner triggers to match the actual conveyor speed. This dynamic approach allows the system to maintain accurate image capture even when conveyor speed varies, preventing image distortion while keeping synchronization manageable through automated controller-based adjustment.
Data Source
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AI summary
A system including at least one linear scanner. The system utilizes multiple modes to synchronize image acquisition of the at least one linear scanner. A first mode directly triggers image acquisition by the at least one linear scanner based on a distance a conveyor of the object carrying a machine-readable symbol has advanced. A second mode includes sending a speed value for the conveyor. The system transitions between the first mode and the second mode based on an operating parameter of the system to optimize performance of the system. The first mode is more accurate at slower conveyor speeds, for example during stop and go events, and the second mode uses less bandwidth at higher speeds, for example during steady-state operation.(Fig. 5)