Multi-Light-Source Laser Calibration for Precise Pattern Overlay
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Solution Overview
Problem
Current laser processing devices using a single light source struggle to adapt to diverse application scenarios due to differences in wavelengths leading to coordinate system discrepancies, resulting in poor overlay effects and image quality issues when multiple light sources are used.
Innovation Solution
A multi-light-source calibration method that establishes a unified coordinate system by producing patterns with different light sources, adjusting galvanometer parameters, and aligning optical paths to ensure consistent coordinate values and scanning areas, thereby maintaining processing quality across light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple light sources with different wavelengths are used to operate on the same focal plane, then the adaptability to diverse application scenarios is improved, but the coordinate systems corresponding to the light sources fail to coincide, resulting in poor overlay effect
Solution Approach 1:
The patent applies preliminary action by performing coordinate system calibration and mapping before actual multi-light-source processing. The system pre-establishes the relationship between different light source coordinate systems and the unified coordinate system through calibration patterns, so that when processing occurs, all light sources already have their coordinate transformations pre-computed, ensuring accurate overlay without real-time adjustment delays
Solution Approach 2:
The patent introduces a unified coordinate system as an intermediary between multiple light sources with different wavelengths. This intermediate coordinate framework allows each light source to be independently calibrated and mapped to the common reference frame, enabling precise coordinate transformation and overlay alignment across different wavelength sources without direct interference between them
2Adaptability or versatility
If different wavelengths of light sources are used, then diverse processing applications are enabled, but reflection paths and angles differ, causing coordinate system discrepancies
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting galvanometer parameters based on the specific wavelength being used. The system stores calibration data for different wavelengths and automatically selects and applies the appropriate galvanometer parameters for each light source, ensuring that coordinate values remain accurate and consistent despite wavelength variations affecting reflection paths and angles
3Manufacturing precision
If galvanometer parameters are adjusted for each light source, then coordinate consistency is improved, but the calibration process becomes more complex
Solution Approach 1:
The patent applies universality by creating a unified coordinate system that serves as a common reference framework for all light sources. This universal coordinate framework allows the same calibration methodology to be applied across multiple wavelengths and light sources, simplifying the overall calibration process despite the need for wavelength-specific parameter adjustments. The unified system provides a multi-functional platform that handles coordinate transformation for all light sources through a single consistent approach
Data Source
AI summary
A multi-light-source calibration method is provided. A first pattern is produced on a processing object by using a first light source, a first coordinate system is established on the processing object, and coordinate values of the first pattern in the first coordinate system are determined. A coordinate mapping relationship between the first coordinate system and a predetermined image coordinate system is constructed. A second pattern is produced on the processing object by using a second light source, and coordinate values of the second pattern in the first coordinate system are obtained. A galvanometer parameter of a laser processing device is adjusted based on the coordinate mapping relationship, to cause coordinate values of an identical image in an identical coordinate system to remain consistent when the identical image is produced separately by using the first light source and by using the second light source.