Multi-Liquid Inkjet Deposition for Application-Specific Inorganic Optics
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Solution Overview
Problem
Traditional methods for manufacturing optical materials, such as melt-quenching and solid-state sintering, face challenges with high-temperature processing requirements, difficulty in achieving high-purity materials, and controlling microstructure and properties.
Innovation Solution
An inkjet deposition process using multiple printheads to deposit inorganic nanoparticles, precursors, and additives, allowing for precise control over the composition and microstructure of optical elements, enabling the creation of bespoke optical elements with tailored complex dielectric properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional melt-quenching and solid-state sintering methods are used to manufacture optical materials, then high-purity materials can be achieved, but high-temperature processing requirements and difficulties in controlling microstructure and properties occur
Solution Approach 1:
The patent changes the processing parameters from high-temperature sintering to low-temperature inkjet deposition and drying. The inkjet printing process allows precise control of material deposition at ambient or mildly elevated temperatures, followed by controlled drying to achieve the desired microstructure and optical properties without traditional high-temperature processing
Solution Approach 2:
The patent replaces the thermal-mechanical sintering process with a deposition-based approach. Instead of using high temperature and pressure to densify and form optical materials, the invention uses inkjet deposition to precisely place material followed by drying, substituting the thermal-mechanical field with a deposition-evaporation field
2Adaptability or versatility
If traditional manufacturing methods are used, then optical materials can be produced, but flexibility in creating complex shapes and tailored properties is limited
Solution Approach 1:
The patent segments the manufacturing process into discrete digital layers and deposition patterns. The inkjet printing system deposits material layer by layer with precise spatial control, allowing complex three-dimensional shapes to be built from simple digital models. This segmentation enables flexible creation of custom geometries without requiring complex tooling or molds
Solution Approach 2:
The patent introduces dynamic control through digital patterning and variable deposition parameters. The inkjet system can dynamically adjust deposition location, amount, and composition for each layer based on digital design requirements, enabling real-time customization of complex shapes and graded properties without changing physical tooling
3Manufacturing precision
If inkjet deposition is used to precisely control composition and microstructure, then bespoke optical elements with tailored properties can be created, but the process requires multiple printheads and complex deposition patterns
Solution Approach 1:
The patent makes each inkjet printhead multi-functional by enabling it to deposit multiple different inorganic materials through material swapping or multi-material cartridges. Each printhead can function as multiple specialized printheads, reducing the total number of physical printheads needed while maintaining the ability to deposit diverse materials with different optical properties
Solution Approach 2:
The patent uses periodic deposition patterns where materials are deposited in alternating sequences or cycles across different layers. By strategically alternating the deposition of materials with different refractive indices and dispersion properties in a periodic manner, the system achieves precise control over optical properties through the cumulative effect of multiple periodic layers rather than requiring simultaneous complex multi-printhead coordination
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 optical elements with precise control over refractive index, dispersion, and partial dispersion, facilitating the creation of complex-shaped glass-ceramic optics with improved quality and flexibility, suitable for various applications including optical lenses and mirrors.
Implementation Method 1
each including a volatile solvent
Implementation Method 2
sintering the series of pre-sintered layers to form a vitreous monolith
Data Source
AI summary
An example method for making an optical element comprises: (a) receiving in a printing device a plurality of liquids, each including a volatile solvent, wherein one or more of the liquids also includes a suspension of particles or a sol-gel precursor; (b) receiving in the printing device a plurality of print maps corresponding to the plurality of liquids, each print map defining a pattern of application of the corresponding liquid for a series of pre-sintered layers of the optical element; (c) for each pre-sintered layer, operating the printing device to: (i) deposit the plurality of liquids according to the patterns defined in the plurality of print maps for that pre-sintered layer, and (ii) dry the pre-sintered layer; and (d) sintering the series of pre-sintered layers to form a vitreous monolith comprising the optical element.