Laser Focus Zone Orientation Control for Smooth Glass Separation
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Solution Overview
Problem
Current laser processing methods for transparent workpieces, such as glass substrates, face challenges in achieving precise control over the formation of material modifications to ensure a smooth separating surface during separation, as existing technologies lack effective control over the direction and alignment of focus zones.
Innovation Solution
An apparatus and method that utilize a beam shaping device to form an elongate focus zone with an asymmetric cross-section, allowing for open-loop or closed-loop control of the preferred direction of the focus zone, which is alterable during processing to align material modifications parallel to the advancement direction, thereby enabling smoother separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a pulsed laser beam with an elongate focus zone is used to process transparent workpieces, then material modifications can be formed for separation, but the control over the direction and alignment of the focus zone is insufficient, resulting in poor separating surface quality
Solution Approach 1:
The patent employs dynamic control of the focus zone orientation through rotation of the beam shaping device or use of a galvo mirror, allowing the preferred direction of the elongate focus zone to be adjusted in real-time during laser processing. This dynamic adjustment capability enables precise alignment of material modifications with the advancement direction, resolving the contradiction between alignment precision and system complexity by providing control only when needed.
Solution Approach 2:
The patent changes the orientation parameter of the focus zone by rotating the beam shaping device or altering the beam propagation direction using optical elements. This parameter change allows the focus zone to be aligned with the advancement direction, improving separating surface quality without requiring a completely new control system architecture.
2Adaptability or versatility
If the focus zone orientation is fixed, then the device complexity is reduced, but the ability to align material modifications parallel to the advancement direction is limited, affecting separation quality
Solution Approach 1:
The system transitions from a fixed focus zone orientation to a dynamically adjustable orientation using rotation mechanisms or galvo mirrors. This dynamic capability provides adaptability to different processing requirements while maintaining relatively simple implementation through well-established optical rotation techniques.
Solution Approach 2:
The beam shaping device is designed to perform multiple functions: it creates the elongate focus zone, controls its orientation, and can be integrated with existing laser processing systems. This multi-functionality increases adaptability without proportionally increasing overall system complexity.
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 allows for precise control over the formation and alignment of material modifications, resulting in a smoother separating surface during the separation of transparent workpieces, enhancing the efficiency and quality of the laser processing.
Implementation Method 1
a beam shaping device for forming a focus zone from an input laser beam, wherein the focus zone is formed in elongate fashion in relation to a longitudinal axis
Implementation Method 2
the focus zone impinges on a material of the workpiece and the focus zone is moved relative to the material, wherein material modifications are formed in the material
Data Source
AI summary
An apparatus for laser processing of a workpiece is provided. The workpiece includes a transparent material. The apparatus includes a beam shaping device for forming a focus zone from an input laser beam. The focus zone is formed in elongate fashion in relation to a longitudinal axis. The focus zone has, in a plain perpendicular to the longitudinal axis, an asymmetric cross-section with a preferred direction. The apparatus further includes an actuating device for altering the preferred direction during the laser processing of the workpiece, and a control device for controlling the actuating device based on a predefined assignment specification in order to control the preferred direction by open-loop control or closed-loop control during the laser processing of the workpiece.