Laser Processing Focus Control Using Plasma Light Feedback
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Solution Overview
Problem
Conventional laser processing devices face challenges in accurately processing workpieces without high-quality 3D CAD data, as they struggle to correctly condense laser light, leading to deteriorated processing quality, especially when the workpiece's posture changes or is indefinite.
Innovation Solution
A laser processing device equipped with an optical scanning unit, condenser lens, and plasma light sensor, where the control unit generates processing position data based on plasma light detection results, ensuring accurate laser light condensation and processing even without highly accurate 3D CAD data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional laser processing devices rely on 3D CAD data for processing, then processing can be performed with existing data, but processing quality deteriorates when 3D CAD data is inaccurate or unavailable
Solution Approach 1:
The system uses the workpiece itself to generate plasma light when laser light is applied, and detects this plasma light to automatically determine the focal position and surface location, eliminating the need for external 3D CAD data. The workpiece provides its own information through plasma emission for positioning and focusing.
Solution Approach 2:
The patent replaces the mechanical/optical system based on 3D CAD data with a plasma light detection system. Instead of using pre-programmed positional information from CAD data, the system uses plasma light emission characteristics to dynamically determine processing positions and focal points.
2Manufacturing precision
If laser light is condensed on the workpiece without accurate focal position detection, then processing can proceed, but processing quality deteriorates due to incorrect laser condensation
Solution Approach 1:
The system applies laser light to the workpiece, detects the plasma light generated in real-time, and uses this detection feedback to determine the focal position and surface location. This closed-loop feedback mechanism ensures accurate focusing without requiring pre-known workpiece geometry.
Solution Approach 2:
Before actual processing, the system performs a preliminary scanning operation where laser light is applied and plasma light is detected to identify the workpiece surface and focal position. This preliminary action establishes accurate positioning information for subsequent processing.
3Adaptability or versatility
If the workpiece posture changes or is indefinite, then flexibility is maintained, but processing quality deteriorates
Solution Approach 1:
The system dynamically adapts to workpiece posture changes by continuously detecting plasma light during scanning. Instead of relying on fixed positional data from 3D CAD, the system实时更新 focal position and surface location based on actual plasma emission, maintaining processing quality regardless of workpiece orientation or positioning variations.
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
This solution enables high-accuracy processing of workpieces by adjusting laser light intensity and focal position based on plasma light detection, maintaining processing quality regardless of the workpiece's CAD data accuracy and posture changes.
Implementation Method 1
a plasma light sensor for detecting plasma light emitted from a workpiece
Implementation Method 2
a condenser lens that condenses the laser light onto a workpiece
Implementation Method 3
an optical scanning unit that scans laser light
Data Source
AI summary
A laser processing device includes an optical scanning unit that scans laser light; a condenser lens that condenses the laser light onto a workpiece; a plasma light sensor that detects plasma light from the workpiece; and a control unit configured to generate processing position data for the laser light for processing the workpiece, wherein the control unit causes the optical scanning unit to scan the laser light and causes the plasma light sensor to acquire a detection result of detecting the plasma light from the workpiece, and the control unit generates the processing position data for the laser light for processing the workpiece on the basis of the detection result.