PDMS Lens Fabrication via Thermal Curing on Heated Substrates
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Solution Overview
Problem
Current methods for fabricating high-quality optical lenses are complex, costly, and limited in size, requiring iterative processes and precise control of fabrication parameters, while also lacking flexibility and mechanical stability.
Innovation Solution
A method for curing liquid polydimethylsiloxane (PDMS) on a pre-heated substrate, allowing for the production of high-quality, inexpensive, and flexible optical lenses and fibers with variable focal lengths by controlling the volume of PDMS, substrate temperature, and motion, eliminating the need for molds and iterative steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional mechanical polishing or injection molding is used to fabricate lenses, then high optical quality can be achieved, but fabrication complexity increases and yield reduces
Solution Approach 1:
The patent replaces traditional mechanical polishing and injection molding processes with a chemical curing process. Liquid PDMS is deposited onto a heated substrate where it cures to form optical lenses, eliminating the need for complex mechanical fabrication equipment and iterative polishing steps while maintaining high optical quality
Solution Approach 2:
The patent changes the fabrication parameters from mechanical processes to thermal-chemical processes. By controlling substrate temperature, PDMS composition, and deposition parameters, high-quality optical lenses are formed through curing rather than mechanical shaping, reducing fabrication complexity while maintaining precision
2Manufacturing precision
If iterative gravity-assisted processes are used to fabricate mold-free PDMS lenses, then high quality lenses can be produced, but production time increases due to required iterative steps
Solution Approach 1:
The patent applies preliminary action by pre-heating the substrate before PDMS deposition. This prepares the substrate in advance to immediately cure the PDMS upon contact, eliminating the need for iterative gravity-assisted processes and reducing production time while maintaining lens quality
Solution Approach 2:
The patent achieves continuous useful action by having the PDMS cure continuously as it deposits on the heated substrate. The thermal field is maintained continuously, allowing the PDMS to flow and cure in a single continuous process rather than through discrete iterative steps
3Ease of manufacture
If fluidic lenses are used to create small high quality lenses, then simplicity is achieved, but mechanical stability and evaporation prevention require additional systems
Solution Approach 1:
The patent uses phase transition by curing the liquid PDMS into a solid elastomeric state through thermal processing. This phase change from liquid to solid provides inherent mechanical stability and structural integrity to the lens, eliminating the need for additional encapsulation systems while maintaining fabrication simplicity
Solution Approach 2:
The patent creates composite structures by forming the solid PDMS lens on a heated substrate. The resulting composite provides both the optical properties of the PDMS lens and the mechanical stability of the substrate, achieving reliability without compromising ease of manufacture
4Manufacturing precision
If lithographic or molding equipment is used to fabricate lenses, then good optical characteristics can be achieved, but costs increase significantly
Solution Approach 1:
The patent employs disposable low-cost substrates (such as glass slides or metal plates) that are pre-heated and then discarded or reused after a single PDMS lens fabrication. This eliminates the need for expensive lithographic or molding equipment while maintaining good optical characteristics, dramatically reducing fabrication costs
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 method enables the production of high-quality optical materials with adjustable focal lengths, achieving imaging resolutions of 10 μm and optical magnification of ×12, and can transform mobile devices into microscopes or enhance magnification in eyeglasses, with lenses ranging from 0.5 mm to 10 cm focal length, at a low material cost.
Implementation Method 1
curing liquid polydimethylsiloxane (PDMS) in or on heated substrates
Implementation Method 2
The process for fabricating optical material requires simply ejecting a volume of polydimethylsiloxane (PDMS) in liquid form into or onto a substrate having a pre-selected temperature and allowing the PDMS to cure to solid form
Implementation Method 3
When PDMS is dropped onto a surface, interfacial surface energies allow the droplet to hold itself up into a droplet shape which naturally acts as a lens
Data Source
AI summary
A lithography-free, mold-free method of fabricating high quality optical material by curing polydimethylsiloxane (PDMS) droplets in or on pre-heated substrates allows lenses with different focal lengths to be made by varying the volume and surface temperature, as well as the substrate.