Laser Processing Coordinate Mapping for Positioning Error Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Laser processing systems face challenges in achieving precise positioning due to cumulative positioning errors of interacting components, which affect the accuracy of processing and measurement.
Innovation Solution
A method involving the use of two coordinate systems, a processing coordinate system and a measuring coordinate system, where a mapping is defined to associate positions between the two systems, allowing for precise processing without requiring high-accuracy alignment of components, and enabling compensation for dynamic errors and image distortions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple components are positioned and aligned with high accuracy with respect to a fixed point, then processing precision is improved, but positioning errors of individual components add up cumulatively
Solution Approach 1:
A marker is introduced as an intermediary reference object on the workpiece. Instead of directly aligning multiple components with a fixed point, the marker serves as a common reference that both the detection device and processing device can independently locate. This eliminates cumulative positioning errors by providing a single, stable reference point on the workpiece itself.
Solution Approach 2:
The system creates a digital copy or representation of the marker's position and characteristics. The detection device captures information about the marker, and this information is used to establish the coordinate transformation between the detection coordinate system and the processing coordinate system. This copying approach allows precise position transfer without physical repositioning errors.
2Manufacturing precision
If high-accuracy alignment of components is required, then processing accuracy is improved, but device complexity and alignment difficulty increase
Solution Approach 1:
The marker acts as a mediator that simplifies the alignment process. Rather than requiring complex multi-component alignment with a fixed point, the system only needs to detect the marker's position and compute a coordinate transformation. This reduces alignment complexity from multiple mechanical alignment steps to a single detection and computation step.
Solution Approach 2:
The patent replaces mechanical alignment systems with an optical/detector-based system. Instead of mechanically aligning components with high precision, the system uses a detection device to optically or electronically detect the marker position and computationally determines the coordinate transformation. This substitution of mechanical alignment with detection-based positioning reduces device complexity.
3Ease of operation
If absolute positioning with respect to a fixed point is used, then position reference is simplified, but cumulative errors from multiple components degrade precision
Solution Approach 1:
The marker serves as a local reference intermediary on the workpiece. Instead of using a fixed point in space that requires multiple components to align with it, the marker is attached to or on the workpiece itself. Both detection and processing operations reference this single marker, eliminating cumulative errors while maintaining simple position reference through the marker's location.
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 approach allows for high-accuracy processing and measurement by using repeat accuracy instead of absolute positioning, reducing the need for precise alignment and compensating for errors, thereby improving the overall precision of laser processing.
Implementation Method 1
a laser device configured to emit a laser beam onto a workpiece for processing the workpiece
Implementation Method 2
a sensor device configured to determine a measuring position of the marking in a measuring coordinate system by measuring the marking
Data Source
AI summary
Disclosed is a method comprising: processing a workpiece in a processing position and thereby generating a marking in the processing position, the processing position being defined by coordinates in a processing coordinate system; determining a measuring position of the marking in a measuring coordinate system by measuring the marking; defining a mapping using the processing position and the measuring position, wherein the mapping maps a position in the measuring coordinate system onto a position in the processing coordinate system.