Rotary Laser Power Control for Line Sharpness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing rotating laser devices operating in line mode suffer from blurred laser lines due to motor-induced deceleration and acceleration, increasing the risk of eye damage and reducing precision.
Innovation Solution
The method adjusts laser power to zero at the end points of the rotation angle, allowing maximum power usage within the laser line and reducing eye damage risk by decelerating or accelerating the rotary device outside the line, resulting in a sharply defined laser line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the laser device operates in line mode with constant motor speed, then the laser line should be continuous, but the motor deceleration and acceleration at end points causes the laser line to blur
Solution Approach 1:
The patent applies dynamics by making the motor speed variable rather than constant. The control device dynamically adjusts the rotation speed of the rotary device based on the angular position, reducing speed near the end points to prevent blurring while maintaining higher speed in the middle section for continuous laser line coverage.
Solution Approach 2:
The patent changes the parameter of motor rotation speed as a function of angular position. By modifying the speed parameter dynamically during operation - slowing down near end points and maintaining higher speed elsewhere - the system resolves the contradiction between continuous laser line coverage and sharp definition at endpoints.
2Illumination intensity
If the laser power is maintained at maximum level, then the laser line is clearly visible, but the risk of eye damage increases when the beam is stationary at end points
Solution Approach 1:
The patent applies local quality by making the laser power non-uniform across the operating range. The control device adjusts laser power locally - reducing it to zero near the end points where the beam would be stationary and potentially harmful, while maintaining maximum power in the middle section where the beam is moving and visibility is prioritized.
Solution Approach 2:
The patent converts the potentially harmful stationary beam at endpoints into a beneficial control mechanism. By intentionally reducing power to zero at these positions, the system eliminates eye damage risk while the motor's natural deceleration and acceleration characteristics are leveraged to maintain smooth operation throughout the scanning range.
3Object-affected harmful factors
If the laser power is reduced to zero at end points, then eye damage risk is reduced, but the laser line may become discontinuous
Solution Approach 1:
The patent applies periodic action through the cyclic nature of the rotary scanning operation. The laser power follows a periodic pattern - maximum in the middle section, reduced to zero at endpoints - which repeats with each rotation cycle. This periodic modulation of power, combined with the periodic motion of the rotary device, maintains perceived continuity of the laser line while eliminating hazards at turnaround points.
Data Source
Figure 1
Figure 2a~2b
AI summary
Laser device (1) comprising a laser device (3) generating a laser beam (5) and a rotary device (9) moving the laser device (3) back and forth about a rotational axis (4) between a first turning point (W1) and a second turning point (W2), wherein the laser beam (5) generates a laser line (15) on a target surface (14) between a first endpoint (E1) and a second endpoint (E2), wherein a control device (8) is provided which adjusts the laser power of the laser beam (5) depending on a rotation angle and/or an angular velocity of the rotary device (9).