Transparent Substrate Contour Cutting With Debris-Free Crack Propagation
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Solution Overview
Problem
Existing methods for cutting transparent substrates like glass generate significant debris and subsurface damage, requiring extensive grinding or polishing, which increases manufacturing complexity and cost, especially for applications requiring defect-free edges and surfaces.
Innovation Solution
A non-ablative process using a pulsed laser beam to induce nonlinear absorption in the substrate, creating a defect line that propagates a crack without filamentation, allowing for the removal of interior portions without generating debris or significant surface damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ablative laser processes are used to cut transparent substrates, then material can be removed layer-by-layer, but significant debris is generated that contaminates surfaces and creates subsurface damage
Solution Approach 1:
The patent changes the fundamental laser processing parameter from ablative removal to crack propagation through controlled heating. By using a defocused laser beam that heats material along a linear path rather than removing it layer-by-layer, the process achieves cutting without generating significant debris or subsurface damage, thus resolving the contradiction between productivity and harmful factors
Solution Approach 2:
The patent replaces the mechanical ablation process with a thermal-mechanical crack propagation process. Instead of using high-intensity laser beams to physically vaporize material, the system uses a lower-intensity defocused beam to heat and induce thermal stress that propagates cracks along the desired cut path, eliminating debris generation while maintaining cutting capability
2Manufacturing precision
If multiple laser passes are used to remove material layer-by-layer, then cutting can be achieved, but the process complexity and manufacturing time increase
Solution Approach 1:
The patent applies preliminary action by creating a defocused laser path that pre-heats and creates a linear defect line through the entire thickness of the substrate in a single pass. This preliminary heating action creates a controlled crack path that guides subsequent material separation, eliminating the need for multiple sequential passes and significantly reducing manufacturing cycle time while maintaining precision
3Manufacturing precision
If ablative processes are used to achieve precise cuts, then material can be removed, but extensive grinding or polishing is required to remove subsurface damage
Solution Approach 1:
The patent converts the potential harm of thermal processing into a benefit by using controlled crack propagation instead of uncontrolled ablation. The thermal field is used to create clean, predictable crack paths along the cut line, resulting in edges with minimal subsurface damage that require little to no grinding or polishing, thus converting thermal energy from a potential source of damage into a tool for precise cutting
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
The process achieves precise cutting with minimal subsurface damage and surface roughness, reducing the need for extensive finishing operations and lowering manufacturing costs by minimizing edge defects and debris generation.
Implementation Method 1
inducing nonlinear absorption in the material to be processed by directing a laser beam of sufficient intensity at the substrate, wherein the substrate would be substantially transparent to the laser beam at a lesser intensity
Implementation Method 2
heating the substrate along the first predetermined path to propagate a crack through each defect line of the first plurality of locations, thereby isolating an interior plug from the substrate
Data Source
AI summary
A method for cutting, separating and removing interior contoured shapes in thin substrates, particularly glass substrates. The method involves the utilization of an ultra-short pulse laser to form defect lines in the substrate that may be followed by use of a second laser beam to promote isolation of the part defined by the interior contour.