Scanner Mirror Incidence Geometry for High-Power Laser Machining
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Solution Overview
Problem
Existing laser machining systems face limitations in deflection speed and process stability due to thermal load and susceptibility to soiling of scanner mirrors, particularly when using high laser powers.
Innovation Solution
A laser machining head with a scanner unit featuring a scanner mirror tiltably mounted about two rotational axes, with a laser beam incident at an angle of up to 30° relative to the scanner mirror's surface normal, and incorporating a collimation, deflection, and focusing units to optimize beam alignment and reduce scanner mirror size and mass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the laser beam is incident on the scanner mirror at a larger angle of incidence, then the scanner mirror size can be reduced, but the susceptibility to soiling and thermal load increases
Solution Approach 1:
The patent optimizes the angle of incidence parameter to a specific range (5° to 30°) to achieve the best compromise between scanner mirror size and resistance to soiling/thermal load. This parameter optimization resolves the contradiction by finding the optimal value that satisfies both requirements simultaneously.
2Reliability
If the scanner mirror is made larger to reduce susceptibility to soiling, then thermal resistance improves, but the deflection speed decreases
Solution Approach 1:
The patent optimizes the angle of incidence parameter to a specific range (5° to 30°) to achieve the best compromise between scanner mirror size and resistance to soiling/thermal load. This parameter optimization resolves the contradiction by finding the optimal value that satisfies both requirements simultaneously.
3Productivity
If high laser power is used to improve machining productivity, then processing speed increases, but the thermal load on scanner optical elements increases
Solution Approach 1:
The patent optimizes the angle of incidence parameter to minimize thermal load on the scanner mirror while maintaining high laser power processing capability. This allows high productivity to be achieved without excessive thermal accumulation on the optical elements.
4Speed
If the scanner mirror mass is reduced to increase deflection speed, then dynamics improve, but the susceptibility to thermal load increases
Solution Approach 1:
The patent optimizes the angle of incidence parameter to achieve a balance where the scanner mirror can be lightweight for high deflection speed while minimizing its exposure to thermal load through the optimized beam incidence geometry.
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
Enhances deflection speed, reduces susceptibility to high laser powers, and minimizes soiling, improving dynamics, contour accuracy, and thermal resistance in laser machining processes.
Implementation Method 1
a laser beam which runs through the beam path is incident on the scanner mirror at an angle of incidence α of at most 30° relative to a surface normal of the scanner mirror
Data Source
AI summary
A laser machining head includes a scanner arranged in a beam path of the laser machining head. The scanner includes a scanner mirror that is tiltably mounted about two rotational axes. The scanner is arranged in the laser machining head such that a laser beam which runs through the beam path is incident on the scanner mirror at an angle of incidence α of at most 30° relative to a surface normal of the scanner mirror.