Laser Scanning Apparatus Overlapping Angular Ranges
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Solution Overview
Problem
Existing laser scanning technologies face a decrease in scanning density at distant target positions due to increasing pitch between adjacent beams, leading to reduced measurement accuracy and increased costs when attempting to mitigate this through motor speed reduction or shorter light emission intervals.
Innovation Solution
A laser scanning apparatus and method where the rotary body repeatedly rotates in partially overlapping angular ranges with successive start position shifts, allowing for increased scanning density without the need for costly motor adjustments or larger light emission components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the rotation speed of the motor is reduced to maintain scanning density, then the scanning density is improved, but the rotation unevenness increases which adversely affects measurement accuracy
Solution Approach 1:
The scanning area is divided into multiple sub-areas by performing laser scanning multiple times with different start positions. Each scan covers a partial angular range, and by segmenting the overall scanning task into multiple passes with shifted start positions, the system achieves higher scanning density without requiring slow rotation that would cause unevenness.
Solution Approach 2:
The laser scanning is performed periodically multiple times with a predetermined interval between emissions. By using periodic action with multiple repetitions and shifting start positions, the system maintains consistent rotation speed while achieving high scanning density through repeated scans on overlapping areas.
2Productivity
If the interval of emission of scanning light is shortened to increase scanning density, then the scanning density is improved, but the cost and size of light emission component increase
Solution Approach 1:
The system dynamically adjusts the start positions of repeated scans rather than changing the light emission interval. By making the scanning process dynamic through variable start positions across multiple passes, the system achieves higher scanning density while maintaining the same light emission component specifications.
3Measurement precision
If the pitch between adjacent beams is reduced to maintain scanning density at distant positions, then the scanning density is improved, but the rotation speed must be reduced which increases rotation unevenness
Solution Approach 1:
The system adds the dimension of time by performing multiple repeated scans instead of attempting to achieve high density in a single pass. By utilizing multiple passes with shifted start positions, the system achieves high scanning density at distant positions without compromising rotation speed, effectively solving the problem in a different dimensional approach.
Data Source
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AI summary
Scanning density of laser scanning is increased at low cost. A laser scanning apparatus includes a horizontal rotation unit and a controller. The horizontal rotation unit determines an area of laser scanning. The controller controls rotation of the horizontal rotation unit. The horizontal rotation unit is rotated while the laser scanning is performed, whereby scanning using laser scanning light is performed in a vertical angle direction at a predetermined interval. The controller makes the horizontal rotation unit repeatedly rotate multiple times in angular ranges that partially overlap one another, in order to perform the laser scanning multiple times on areas of the laser scanning that overlap one another. Start positions of the rotation of multiple times of the horizontal rotation unit are successively shifted by a predetermined amount. The predetermined amount of shifting corresponds to a distance shorter than the predetermined interval.