Laser Condensing Spot Position Detection Method
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Solution Overview
Problem
In laser beam processing apparatuses, accurately positioning the condensing spot of a laser beam is challenging due to the need for precise spacing between the condenser and the workpiece holding means, which can lead to improper positioning of the condensing spot relative to the workpiece.
Innovation Solution
A method involving a workpiece holding means, laser beam irradiation means, processing feeding means, indexing feeding means, condensing point control means, Z-axis directional position detection, imaging, and display means to detect and display the condensing spot position by forming and imaging laser beam processed grooves on a plate-shaped body, allowing for accurate positioning of the condenser.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the spacing between the condenser and workpiece holding means is not maintained with high accuracy, then the condensing spot cannot be properly positioned relative to the workpiece, but maintaining high accuracy spacing increases device complexity and operational difficulty
Solution Approach 1:
The patent replaces mechanical spacing control mechanisms with an optical detection system. A laser beam is used to detect the condensing spot position on the workpiece, and this position information is fed back to automatically adjust the condenser position, thereby eliminating the need for complex mechanical spacing control mechanisms while achieving high positioning accuracy.
Solution Approach 2:
The patent implements a feedback control system where the condensing spot position is detected by a laser beam and imaging system, and this detected position is used to automatically adjust the condenser position. This closed-loop feedback mechanism ensures high positioning accuracy without requiring complex mechanical pre-adjustment mechanisms.
2Measurement precision
If the condensing spot position is not accurately detected, then laser beam processing accuracy deteriorates, but implementing detection mechanisms increases device complexity
Solution Approach 1:
The patent makes the laser beam serve multiple functions: it is used both for the actual workpiece processing and for detecting the condensing spot position. The same laser beam that processes the workpiece also creates a detectable pattern on the workpiece surface that indicates the condensing spot position, eliminating the need for a separate detection laser system.
Solution Approach 2:
The patent introduces an intermediary imaging system that captures the condensing spot position information from the workpiece surface. This imaging system acts as a mediator between the laser beam and the control system, converting the optical information into detectable signals without requiring direct complex measurement of the condenser position.
3Manufacturing precision
If multiple detection positions are tested to find the optimal condensing spot position, then positioning accuracy improves, but processing time increases
Solution Approach 1:
The patent performs preliminary detection by projecting the laser beam to create a pattern on the workpiece surface before actual processing begins. This preliminary action allows the system to identify the optimal condensing spot position in advance, so that subsequent processing can proceed with high accuracy without repeated adjustments and time loss.
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
Enables easy distinction of the thinnest laser beam processed groove, facilitating precise positioning of the condensing spot and improving the accuracy of laser beam processing operations.
Implementation Method 1
laser beam irradiation means provided with a condenser for irradiating the workpiece held on the workpiece holding means with a laser beam
Implementation Method 2
forming a laser beam processed groove of a predetermined length in the plate-shaped body held on the workpiece holding means
Data Source
AI summary
A method of detecting a condensing spot position in a laser beam processing apparatus, including: a detection position setting step of setting a plurality of Z-axis directional positions in a range from a starting point to an ending point of detection positions into which the condenser is positioned; a laser beam processed groove forming step of sequentially positioning the condenser into the detection positions in the range from the starting point to the ending point, performing a predetermined interval indexing feeding by operating indexing feeding means each time the detection position for the condenser is changed, and forming a laser beam processed groove of a predetermined length in the plate-shaped body at each of the detection positions for the condenser; and a laser beam processed groove imaging step of imaging the laser beam processed grooves formed in the plate-shaped body by imaging means.