Liquid Lens Sidewall Reflow via Mobile Component Migration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Isothermal glass pressing is limited to small glass articles with simple geometries due to high viscosity and mold complexity, making it difficult to produce large or complex shaped articles with smooth surfaces suitable for applications like liquid lenses.
Innovation Solution
A method involving the deposition of a surface modification layer on the sidewalls of cavities formed in a glass or glass-ceramic article, using a glass material with a mobile component that migrates and reflows, reducing the annealing point and surface roughness of the sidewalls, allowing for the production of smooth cavities and liquid lenses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If isothermal glass pressing is used to maintain high viscosity and prevent sticking, then surface quality is maintained, but the article size and geometric complexity are limited
Solution Approach 1:
A surface modification layer is deposited on the mold cavity sidewalls before the glass pressing process. This layer contains mobile components that will later migrate to create a low-viscosity surface region, enabling complex geometries while maintaining surface quality through pre-prepared surface conditions
Solution Approach 2:
The viscosity parameter of the glass surface is dynamically changed during the process. The mobile component migration creates a gradient in viscosity - high viscosity in the bulk prevents sticking, while low viscosity at the surface enables complex shaping. This parameter transformation resolves the contradiction between maintaining surface quality and achieving geometric complexity
2Manufacturing precision
If high viscosity glass is used to prevent sticking to the mold, then surface quality is maintained, but the glass cannot be reflowed to smooth surfaces
Solution Approach 1:
The glass structure is made non-uniform with different viscosity characteristics in different regions. The bulk glass maintains high viscosity to prevent sticking, while the surface region modified by mobile component migration achieves low viscosity for easy reflowing and smoothing. This local differentiation resolves the contradiction between preventing sticking and enabling surface reflow
Solution Approach 2:
The glass system effectively becomes composite with two distinct phases: a high-viscosity bulk phase and a low-viscosity surface phase created by mobile component migration. This composite structure allows simultaneous achievement of non-sticking properties and surface reflow capability
3Adaptability or versatility
If complex mold geometries are used to produce shaped articles, then article complexity is improved, but mold complexity and pressing force requirements increase
Solution Approach 1:
The surface modification layer is applied in advance to the mold cavity, preparing the surface conditions needed for complex shaping. This preliminary action reduces the complexity requirements of the mold itself by providing a ready-made low-viscosity surface layer that facilitates complex geometry formation without requiring equally complex mold features
4Adaptability or versatility
If high pressing force is applied to achieve complex geometries, then article complexity is improved, but the risk of glass sticking to the mold increases
Solution Approach 1:
The viscosity parameter of the glass surface is transformed through mobile component migration, creating a low-viscosity surface layer that prevents sticking. This allows high pressing forces to be applied for complex geometry formation without the harmful sticking effect, as the surface viscosity has been fundamentally changed
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
Enables the production of large or complex shaped articles with reduced sidewall roughness, facilitating the manufacturing of liquid lenses with smooth surfaces and improved optical properties.
Implementation Method 1
At least a portion of the mobile component is migrated from the surface modification layer into surface regions of the sidewalls of the shaped article
Implementation Method 2
The surface modification layer and the surface regions of the sidewalls are reflowed
Data Source
AI summary
A method includes depositing a surface modification layer on sidewalls of a plurality of cavities of a shaped article. The surface modification layer is formed from a glass material including a mobile component. The shaped article is formed from a glass material, a glass ceramic material, or a combination thereof. At least a portion of the mobile component is migrated from the surface modification layer into surface regions of the sidewalls of the shaped article, whereby subsequent to the migration, the surface regions have a reduced annealing point compared to a bulk of the shaped article. The surface modification layer and the surface regions of the sidewalls are reflowed. A surface roughness of the surface modification layer disposed on the sidewalls following the reflowing is less than a surface roughness of the sidewalls prior to the depositing.