Laser Scanning Apparatus Periodic Pulse Emission Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing laser scanning technologies face challenges in maintaining scanning density at a distance due to increased pitch between laser beams, leading to decreased measurement accuracy and higher costs when attempting to address this issue through rotation speed reduction or light emission interval shortening.
Innovation Solution
A laser scanning apparatus with a rotary body emitting pulses of light orthogonally to its rotation axis, utilizing a controller to shift the emission position and timing of pulses based on periodic signals with varying phases, allowing for increased scanning density without the need for costly motor adjustments or larger light emission components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the rotation speed of the motor is reduced to maintain scanning density, then the scanning density is improved, but the unevenness in rotation becomes conspicuous and measurement accuracy deteriorates
Solution Approach 1:
The patent applies periodic action by emitting laser scanning light at specific intervals during rotation rather than continuously. The controller is configured to emit pulses of laser scanning light at predetermined timing during each rotation, creating a periodic scanning pattern that maintains density without requiring slow rotation speeds.
Solution Approach 2:
The patent implements preliminary action by pre-calculating and pre-setting the emission timing of laser pulses based on the rotation phase. The controller determines in advance when to emit each pulse during the rotation cycle, ensuring uniform angular distribution without needing to slow down the rotation to maintain precision.
2Manufacturing precision
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 the light emission component increase
Solution Approach 1:
The system uses periodic pulse emission controlled by a timer unit that generates emission signals at predetermined intervals based on rotation phase. This temporal periodicity allows high scanning density to be achieved through timing control rather than through increasing the physical complexity or size of the light emission components.
Solution Approach 2:
The patent changes the temporal parameter of light emission by controlling the phase and timing of pulse emission relative to the rotation cycle. By adjusting the emission timing parameter rather than the physical configuration of components, the system achieves high scanning density without increasing device complexity or cost.
3Area of stationary object
If radial laser scanning is performed, then the scanning coverage is maximized, but the pitch between beams increases with distance and scanning density decreases
Solution Approach 1:
The system employs periodic pulse emission synchronized with the rotation phase, emitting laser pulses at predetermined angular intervals. This periodic timing ensures that beams are distributed uniformly across the scanning area, maintaining constant pitch and density throughout the entire coverage area regardless of distance from the center.
Solution Approach 2:
The controller pre-determines the emission timing of each laser pulse based on the desired angular distribution before emission occurs. This preliminary timing calculation ensures that beams are emitted at precisely spaced angular intervals, maintaining uniform pitch across the entire scanning coverage area without density degradation at distant positions.
Data Source
AI summary
Scanning density of laser scanning is increased at low cost. A laser scanning apparatus includes a vertical rotation unit and a controller. The vertical rotation unit emits pulses of laser scanning light. The controller controls emission of pulses of the laser scanning light. Assuming that a symbol “n” is a natural number of one or more, the controller controls so that a position in a rotation direction of emission of pulses of the laser scanning light for (n+1)th rotation of the vertical rotation unit will be different from that for nth rotation of the vertical rotation unit.