Visual Error Calibration for Laser Processing Precision
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Solution Overview
Problem
In laser microprocessing, visual positioning errors occur due to the difference in optical axes between laser and visible light beams, leading to reduced precision in precision processing.
Innovation Solution
A visual error calibration method that involves providing an alignment mark with multiple alignment points, adjusting parameters of a scanning module to align image points on a visible area, and recording positions and parameters to create an alignment table, thereby calibrating visual positioning errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If coaxial vision technique is used to achieve visual positioning, then the processing object can form an image on the charge-coupled device, but the optical axis of the laser light beam differs from the optical axis of the visible light beam due to different wavelengths, generating optical path error and visual errors
Solution Approach 1:
The patent uses an alignment mark with alignment points that are imaged by the visible light beam onto the charge-coupled device. By copying the physical position of alignment points in the working area to their image positions on the sensor, the system establishes a correspondence relationship between real space and image space, enabling calibration of visual positioning errors without requiring the laser and visible light optical axes to coincide
Solution Approach 2:
The patent calibrates visual positioning errors by adjusting parameters including the positions of alignment points in the working area, their corresponding image positions on the charge-coupled device, and parameters of the scanning module. This parameter calibration process creates an alignment table that compensates for optical path differences between laser and visible light beams of different wavelengths
2Adaptability or versatility
If the optical axis of the laser light beam is made different from the optical axis of the visible light beam to accommodate different wavelengths, then laser processing can be performed, but optical path error is generated which reduces visual positioning precision
Solution Approach 1:
The patent introduces an alignment mark as an intermediary element between the laser processing system and the vision system. The alignment mark with its alignment points serves as a reference that connects the physical working area with the image capture area, allowing the system to measure and compensate for optical path differences without requiring the laser and visible light beams to share the same optical axis
Solution Approach 2:
The system captures images of alignment points on the charge-coupled device and uses the measured positions to calculate visual positioning errors. This feedback information is then used to adjust the alignment table parameters, creating a closed-loop calibration process that continuously improves visual positioning precision despite the inherent optical axis misalignment between different wavelength beams
Data Source
AI summary
A visual error calibration method configured to calibrate visual positioning errors of a laser processing apparatus is provided. The method includes: providing an alignment mark having at least one alignment point; locating a preset point of the alignment mark at a first preset position of a working area, and locating a preset image point at a preset position of the visible area; locating the alignment point at one of the second preset positions in the working area; adjusting parameters of a scanning module to locate an alignment image point at the preset position; relatively moving the alignment image point to positions of the visible area in sequence; recording the positions of the alignment image point in the visible area, the positions of the alignment point in the working area and the parameters of the scanning module, so as to produce an alignment table.