Multi-Beam Laser Processing for Precision Cutting
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Solution Overview
Problem
Conventional laser processing methods are inefficient in terms of takt time and accuracy, particularly when forming densely spaced modified regions along a line, leading to potential overstriking and reduced processing quality.
Innovation Solution
A laser processing method that converges multiple laser beams at separated positions along a line and moves them relative to the object to form a series of modified spots, ensuring that later converging positions are between earlier ones to prevent overlap and maintain beam intensity, thereby shortening processing time and enhancing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single laser beam is used to form modified spots along a line to cut, then the processing accuracy can be maintained, but the takt time becomes excessively long
Solution Approach 1:
The invention divides a single laser beam into multiple separate laser beams using a beam splitter. Each beam is then converged at a different position along the line to cut, allowing simultaneous formation of multiple modified spots. This segmentation of the laser beam enables parallel processing, significantly reducing takt time while maintaining processing accuracy through controlled separation of convergence positions.
2Productivity
If multiple laser beams are converged simultaneously at multiple positions, then the takt time is shortened, but the modified spots may become superposed causing overstriking
Solution Approach 1:
The invention applies local quality by giving each laser beam a distinct convergence position along the line to cut. The separation distance between convergence positions is carefully controlled so that modified spots are formed at different locations without superposition. This localized differentiation of beam convergence points enables simultaneous processing while preventing overstriking, thus maintaining manufacturing precision.
3Manufacturing precision
If multiple laser beams are converged at closely spaced positions to form dense modified spots, then the processing quality improves, but the beam intensity may be reduced due to superposition
Solution Approach 1:
The invention transitions from a one-dimensional sequential approach to a multi-dimensional simultaneous approach by converging multiple laser beams at different positions along the line to cut at the same time. The beams are separated in space (different convergence positions) but processed simultaneously, achieving dense modified spot formation without energy loss from superposition. This dimensional approach allows dense spacing while maintaining beam intensity.
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 significantly reduces takt time and achieves precise formation of modified regions without overstriking, maintaining beam intensity and ensuring accurate cutting along the desired line.
Implementation Method 1
irradiating an object to be processed with laser light while locating a converging position within the object, so as to form a modified region in the object along a line to cut
Data Source
AI summary
Laser lights L1 to L3 are relatively moved along a line to cut 5, while repeating a converging step of simultaneously converging the laser lights L1 to L3 at converging positions P1 to P3 separated from each other along the line 5. This forms a plurality of modified spots S along the line 5 and causes the plurality of modified spots S to form a modified region 7. The converging positions P1 to P3 in the repeated converging steps are kept from being superposed on each other, while at least one of converging positions P21 to P23 in the converging step in a later stage is located between converging positions P11 to P13 in the converging step in an earlier stage.