Non-Abrasive Thin Glass Shaping via Magnetic Field Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional polishing technologies are costly and inefficient for accurately shaping thin glass surfaces, particularly due to substrate deformation during grinding and polishing, which makes it difficult to correct glass surface deformations and impart desired convexity or concavity without abrasive processes.
Innovation Solution
A method and apparatus for non-abrasive thin glass shaping that involves receiving information about the actual and desired surface profiles, determining corrective curvature using a Laplacian algorithm, and applying parameters for processes like laser melting, roughening, adhesive deposition, or electro-active polymer deposition to achieve the desired surface profile, using a 3D printer gantry and other tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional abrasive polishing is used to correct glass surface deformations, then manufacturing precision can be improved, but manufacturing cost and process complexity increase significantly
Solution Approach 1:
The patent replaces conventional mechanical abrasive polishing with a non-contact magnetic field-based shaping process. Magnets are positioned behind the glass substrate to apply localized forces that reshape the glass without physical contact, eliminating the need for abrasive materials and complex iterative polishing steps while reducing manufacturing cost and complexity
Solution Approach 2:
The patent changes the fundamental parameter of surface shaping from material removal (abrasive polishing) to material deformation via magnetic force. By controlling the strength and position of magnets, the glass substrate can be shaped into desired convex or concave forms directly, achieving high precision without the costly iterative process of conventional polishing
2Manufacturing precision
If abrasive polishing is used to shape thin glass surfaces, then desired surface profile can be achieved, but substrate deformation occurs during the process making correction difficult
Solution Approach 1:
Instead of applying force from the front surface where deformation is visible, the patent applies magnetic forces from the back surface of the glass substrate. This inverted approach allows the glass to be shaped without disturbing the front optical surface, preventing substrate deformation during the shaping process and maintaining process stability
Solution Approach 2:
The patent introduces magnets as an intermediary tool that indirectly shapes the glass substrate through magnetic attraction forces. This intermediary approach allows precise control of glass deformation without direct mechanical contact, eliminating the substrate deformation issues that occur during conventional abrasive polishing
3Manufacturing precision
If conventional polishing processes are used for large optical surfaces, then optical quality can be achieved, but manufacturing cost increases to hundreds of thousands of dollars per square meter
Solution Approach 1:
The patent segments the glass substrate into multiple zones, each influenced by specific magnets positioned behind the glass. This segmentation allows independent control of different regions of the glass surface, enabling large optical surfaces to be shaped cost-effectively by addressing each zone separately rather than requiring expensive full-surface polishing
Solution Approach 2:
The patent replaces expensive mechanical polishing equipment and abrasive materials with inexpensive magnets and positioning systems. This substitution dramatically reduces manufacturing cost for large optical surfaces while maintaining optical quality through precise magnetic field control
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 enables the production of thin glass products with residual surface shape errors less than 50 nm over 1-10 cm length scales, reducing manufacturing costs and maintaining optical quality, and is scalable for large glass surfaces.
Implementation Method 1
the at least one glass shaping process is laser melting and the at least one parameter is at least one of (A) laser power, (B) laser wavelength, (C) laser spot size, and (D) laser dwell time
Implementation Method 2
the at least one glass shaping process is adhesive deposition and the at least one parameter is at least one of (A) adhesive area, (B) adhesive strength, (C) adhesive shrinkage, and (D) adhesive type
Data Source
AI summary
A thin glass sheet having a desired surface profile is produced by: (a) receiving information about an actual surface of a thin glass sheet to be processed; (b) receiving information describing the desired surface profile of the thin glass sheet; (c) determining a corrective curvature based on (1) the information describing the actual surface of the thin glass sheet, and (2) the information describing the desired surface profile of the thin glass sheet; (d) determining at least one parameter of at least one glass shaping process; and (e) applying the at least one glass shaping process to the thin glass sheet using the parameter (s). The corrective curvature may be determined using a Laplacian of surface data of the thin glass sheet and the desired surface profile.