Galvano-scanner transient current reduction via variable speed scanning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-speed scanning in laser processing systems leads to transient current peaks in the Galvano-scanner, which can be detrimental to the power supply, especially when the scanning speed is accelerated, causing potential damage and inefficiency.
Innovation Solution
A program is developed to generate coordinate data for laser processing that divides straight line segments into sub-segments with varying scanning speeds, gradually increasing and decreasing the scanning speed to reduce the peak transient current by setting specific scanning speeds for different parts of the line segments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the scanning speed of the Galvano-mirror is accelerated to achieve high-speed printing, then the productivity is improved, but a large transient current flows causing harmful effects on the power supply
Solution Approach 1:
The patent applies dynamics by making the scanning speed variable rather than constant. The scanning speed is dynamically adjusted according to the position along the line segment, being lower at the start and end portions and higher at the intermediate portion. This dynamic speed adjustment reduces acceleration and deceleration demands on the Galvano-mirror, thereby suppressing transient current peaks while maintaining high overall scanning speed for improved productivity.
Solution Approach 2:
The patent changes the scanning speed parameter along the length of the line segment. Instead of using a single constant speed, the scanning speed is varied as a function of position, with specific speed values assigned to different segments (start, intermediate, and end portions). This parameter change allows the system to operate at high speeds when possible while reducing speed during acceleration and deceleration phases to minimize transient current.
2Productivity
If the point-to-point distance between coordinate points is increased to reduce data amount, then the productivity is improved, but the manufacturing precision of curved lines deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the treatment of different portions of line segments. The line segments are divided into start portions, intermediate portions, and end portions, with different scanning speed characteristics assigned to each. This local differentiation allows the system to optimize for both speed and precision in different regions, maintaining high data transfer efficiency while ensuring manufacturing precision where needed.
Data Source
AI summary
To form a print design on a workpiece with a laser beam, the print design is divided into one or more straight line segments. For each of the straight line segment, coordinate data representing coordinate points is generated. The laser beam is scanned from a start point of the straight line segment toward an end point thereof via the coordinate points while irradiating the laser beam onto the start point, coordinate points, and the end point. The first part of the straight line segment following the start point and the second part ahead of the end point of the straight line segment are scanned at a speed lower than a designated top speed. An intermediate part between the first and the second parts is scanned at the designated top speed, whereby the peak level of the transient current flowing in the scanning section can be lowered.