Laser Autofocus Using Dual Light Spots for Variable Workpiece Thickness
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Solution Overview
Problem
Current laser focusing methods require manual adjustment of the distance between the light output module and the processing platform, leading to variations in processing quality when working with workpieces of different thicknesses, increasing operational complexity and difficulty.
Innovation Solution
An automatic focusing method using a first and second light output module, where the first module emits a light spot for processing and the second module emits a spot for indication, allowing for the acquisition of multiple images at different distances to determine the workpiece thickness and adjust the focal point automatically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual adjustment of the distance between the light output module and the processing platform is used, then the initial focusing can be achieved, but the processing quality varies when working with workpieces of different thicknesses
Solution Approach 1:
The system uses its own light output modules to emit light spots that serve dual purposes: the first light spot for processing and the second light spot for indication and measurement. By analyzing the images of these light spots at different distances, the system automatically determines workpiece thickness and adjusts focusing without external measurement devices
Solution Approach 2:
The imaging module captures images of the light spots at different distances, and the processor analyzes these images to determine the distance between the light output module and the workpiece surface. This feedback information is then used to automatically adjust the focal point position, creating a closed-loop control system that adapts to different workpiece thicknesses
2Manufacturing precision
If manual adjustment of the light output module distance is used, then focusing can be achieved, but the operational complexity and difficulty increase
Solution Approach 1:
The patent replaces manual mechanical adjustment with an automated optical measurement and control system. The imaging module captures light spot images, the processor analyzes the images to determine distances, and the system automatically adjusts the focal point position, eliminating the need for manual mechanical focusing adjustments
Solution Approach 2:
The imaging module and processor act as intermediaries between the light output module and the workpiece. Instead of direct manual adjustment, the system uses image capture and analysis as an intermediary step to automatically determine the optimal focal point position based on the captured light spot images
3Extent of automation
If multiple images at different distances are acquired to determine workpiece thickness, then automatic focusing is achieved, but the device complexity increases
Solution Approach 1:
The first light output module serves multiple functions: it emits the primary processing light spot and also contributes to the measurement process. The imaging module captures images that provide both processing information and measurement information, allowing the same components to serve multiple purposes and reducing the need for separate dedicated measurement devices
Solution Approach 2:
The patent merges the processing light output function with the measurement function by using the same light output modules and imaging system for both purposes. The first and second light spots are emitted from the same module or integrated modules, and their images are captured together, combining multiple functions into a unified system
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 method reduces manual involvement, minimizes operational errors, and enhances processing precision and efficiency by accurately positioning the focal point on the workpiece surface, lowering the need for detection components and reducing processing costs.
Implementation Method 1
acquiring a plurality of images of the workpiece at different distances, each of the plurality of images including the first light spot and the second light spot
Data Source
AI summary
An automatic focusing method, a laser processing apparatus and system, and a non-transitory computer-readable storage medium are provided. The automatic focusing method for a laser processing apparatus includes: controlling the first light output module to emit a first light spot onto a workpiece, and controlling the second light output module to emit a second light spot onto the workpiece; controlling the first light output module to move downward, and acquiring a plurality of images of the workpiece at different distances; and determining, based on the plurality of images, a distance between a processing surface of the workpiece and the first light output module or a thickness of the workpiece.