Laser Scanner Controller Dynamic Parameter Adjustment
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Solution Overview
Problem
Conventional barcode laser scanners operate with fixed laser power and motor amplitude settings, which are inadequate for varying distances and angles to the target symbol, leading to suboptimal performance and signal noise ratio (SNR).
Innovation Solution
A scanning device with a controller that adjusts motor amplitude, receiver bandwidth, and laser output power based on range estimates from an automatic gain control (AGC) to dynamically optimize scanning parameters, allowing for increased laser power and improved SNR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed laser power and motor amplitude settings are used, then device simplicity is maintained, but scanning performance and signal quality deteriorate at varying distances
Solution Approach 1:
The patent implements dynamic adjustment of laser power and motor amplitude based on detected barcode distance. The system transitions from fixed settings to variable settings that adapt in real-time to scanning conditions, improving performance across different ranges while managing complexity through automated control
Solution Approach 2:
The system changes operating parameters (laser power level and motor amplitude) based on the detected distance to the barcode. By adjusting these parameters dynamically rather than keeping them fixed, the system achieves better adaptability to varying scanning conditions
2Length of moving object
If laser power is increased to improve reading range, then scanning capability at distance improves, but laser safety compliance may be compromised
Solution Approach 1:
The system adjusts laser power as a variable parameter based on the detected distance to the barcode. When the barcode is farther away, higher power is used; when closer, lower power suffices. This dynamic parameter adjustment extends scanning range while maintaining safety by avoiding excessive power at close distances
Solution Approach 2:
The system uses feedback from the detected barcode distance to control laser power output. The distance measurement feeds back to the control system, which then adjusts the laser power accordingly, creating a closed-loop control that balances range and safety
3Area of stationary object
If motor amplitude is increased to expand scan angle, then coverage area improves, but signal noise ratio deteriorates
Solution Approach 1:
The system adjusts motor amplitude as a controllable parameter based on scanning conditions. By optimizing the motor amplitude rather than using fixed high amplitude, the system achieves adequate coverage area while maintaining better signal noise ratio through precise parameter control
Data Source
AI summary
A scanning device includes a laser source emitting a laser scanning beam, a movable scanning mirror reflecting the laser scanning beam towards an on object to be scanned, a mirror moving element moving the movable scanning mirror and a controller receiving an input corresponding to a range estimate from the scanning device to the object and adjusting a setting of the scanning device based on the range estimate.