Circular Array Laser Cutting for Glass Substrate Edge Quality
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Solution Overview
Problem
Mechanical scribing of substrates like glass or quartz for cutting hard disk media results in micro-fractures and splintering, requiring additional repair steps that increase production time and cost.
Innovation Solution
A laser cutting apparatus with multiple independently movable laser sources arranged in a circular array, capable of cutting and shaping substrates to produce defect-free articles by emitting laser beams that heat, fracture, or modify the substrate chemistry for precise separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If mechanical scribing is used to cut glass or quartz substrates, then cutting can be achieved, but micro-fractures and splintering occur requiring additional repair steps
Solution Approach 1:
The patent replaces the mechanical scribing system with a laser-based system. Multiple laser sources emit laser beams that heat, fracture, or modify the substrate chemistry to enable precise separation without mechanical contact, thereby eliminating micro-fractures and splintering caused by mechanical tools while achieving clean cuts with smooth edges
Solution Approach 2:
The patent changes the physical state and chemical properties of the substrate through laser-induced heating and thermal effects. By controlling laser parameters such as power, pulse duration, and wavelength, the system modifies the substrate material properties locally to enable fracture and separation without mechanical stress, producing defect-free surfaces
2Ease of manufacture
If tapping step is used to separate articles from substrate, then separation is achieved, but micro-shock waves cause further fracture and splintering
Solution Approach 1:
The patent eliminates the mechanical tapping step by using laser-induced fracture and chemical modification. The laser beams create controlled stress fields and modify substrate chemistry to enable automatic separation of articles from the substrate without mechanical impact, thereby preventing micro-shock waves and associated damage
Solution Approach 2:
The laser system performs preliminary action by creating micro-fractures and modifying substrate chemistry along the desired cut path before any separation occurs. This pre-conditioning of the substrate material allows for clean separation without requiring subsequent mechanical tapping that would cause damage
3Manufacturing precision
If additional repair steps are implemented to fix damage, then article quality is improved, but production time and cost increase
Solution Approach 1:
The patent converts the potential harm of laser-induced heating and thermal stress into a beneficial effect by precisely controlling these parameters to create clean fractures and smooth edges directly during the cutting process. This eliminates the need for subsequent repair steps that would be required after mechanical cutting, thereby improving both article quality and production efficiency
Solution Approach 2:
By replacing mechanical cutting and repair systems with a laser-based system, the patent achieves both high-quality cuts and improved productivity. The laser system performs cutting and edge finishing in a single integrated process without requiring separate mechanical repair operations, reducing production time and cost while maintaining high manufacturing precision
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 apparatus enables simultaneous cutting and shaping of substrates with smooth edges and high dimensional integrity, reducing defects and production time by using thermal infrared, pulsed, or thermal transparent laser technologies.
Implementation Method 1
The first and second laser sources are each operable to cut a substrate... capable of cutting and shaping substrates to produce defect-free articles by emitting laser beams that heat, fracture, or modify the substrate chemistry
Implementation Method 2
emitting laser beams that heat, fracture, or modify the substrate chemistry for precise separation
Implementation Method 3
emitting laser beams that heat, fracture, or modify the substrate chemistry for precise separation
Data Source
AI summary
Provided herein is an apparatus that includes a first and second laser source. The first and second laser sources are each operable to cut a substrate and are each independently movable with respect to one another. Further, the first and second laser sources are included within a multitude of laser sources that are arranged in a circular array.