Optical Scanner Light-Receptive Field Angle Adjustment
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Solution Overview
Problem
Existing optical scanners face accuracy issues due to the scanning speed of light deflectors, leading to insufficient light-receptive field angles and potential failure in object detection, especially at longer distances.
Innovation Solution
The light-receptive field angle of the optical scanner is set to be greater than or equal to the angle of divergence of laser beams and the scanning angular speed, ensuring reliable light reception despite the shifting angles caused by scanning speed and distance, using a configuration that optimizes the light-emitting and light-receptive field angles based on the scanning characteristics of the light deflector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the scanning angular speed of the light deflector is increased, then the productivity of the optical scanner is improved, but the measurement precision of object detection deteriorates due to angle shifting
Solution Approach 1:
The patent implements feedback by measuring the actual scanning angular speed of the light deflector and using this information to dynamically adjust the light-receptive field angle. The control unit continuously monitors the scanning speed and modifies the receptive field parameters in real-time to compensate for angle shifts, ensuring that the light receiver maintains proper alignment with the returning light regardless of scanning speed variations.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the light-receptive field angle based on the scanning angular speed. When the scanning speed changes, the system modifies the receptive field parameters (angle and duration) to match the new scanning conditions, thereby maintaining detection accuracy across different scanning speeds without requiring a fixed geometric configuration.
2Reliability
If the light-receptive field angle is widened to cover angle shifts, then the reliability of light reception is improved, but the device complexity increases
Solution Approach 1:
The patent applies dynamics by making the light-receptive field angle variable rather than fixed. The optical system dynamically adjusts the receptive field angle according to the actual scanning speed, transforming a static geometric configuration into a dynamic, adaptive system that maintains reliability without requiring excessive angular margin in all conditions.
Solution Approach 2:
The system changes the parameter of the light-receptive field angle based on operating conditions. By adjusting this parameter dynamically, the system achieves reliable light reception only when necessary (when angle shifts occur) rather than maintaining a permanently wide receptive field, thereby balancing reliability with device simplicity.
3Productivity
If the detection distance is increased, then the productivity of the optical scanner is improved, but the measurement precision deteriorates due to larger angle shifts
Solution Approach 1:
The control unit uses feedback from the measured scanning angular speed to adjust the light-receptive field parameters. This feedback mechanism allows the system to compensate for the increased angle shifts that occur at longer detection distances, maintaining measurement precision while extending the detection range by adapting the receptive field to the actual optical path conditions.
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 configuration ensures reliable detection of objects with high precision across various distances, even with slow scanning speeds, by ensuring the light-receptive field angle covers the movement of the light deflector and maintains accurate angle alignment for both emitted and received laser beams.
Implementation Method 1
a light deflector that deflects laser beams emitted from a light emitter
Implementation Method 2
a photodetector detects the light reflected or dispersed from the object
Data Source
Figure 1
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AI summary
An optical scanner (1) includes a light source unit (10, 20) configured to emit a laser beam, a light deflector (30) configured to deflect and scan the laser beam emitted from the light source unit (10, 20) towards an object existing in a detection field, and a light-receptive optical device (50) configured to receive the laser beam deflected and scanned by the light deflector (30) and then reflected or scattered by the object existing in the detection field. A light-receptive field angle (θr) of the light-receptive optical device (50) is determined based on a scanning angular speed of the light deflector (30), a longest detection distance (L) of the object in the detection field, and an angle of divergence (θt) of the laser beam in the detection field.