Fluidic Lens Pre-Tensioning for Orientation Stability
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Solution Overview
Problem
Existing fluidic lens technologies face challenges in controllably altering optical power and maintaining stability under varying orientations, particularly due to the effect of gravity on fluid pressure, which can lead to lens aberrations and reduced durability.
Innovation Solution
A fluidic lens design featuring a transparent window, a distensible membrane, an inner ring, a layer of liquid, and a piston ring that applies a displacement force to the membrane, allowing for adjustable curvature and pre-tensioning to counteract gravity-induced asymmetries, using materials like silicone-based polymers and fluorinated fluids for reduced light scattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fluidic lens uses gravity-dependent fluid pressure to actuate the membrane, then the lens can be actuated with simple structure, but the lens exhibits orientation-dependent aberrations and reduced stability
Solution Approach 1:
The patent introduces a counterweight mechanism that applies an opposing force to balance the gravitational effect on the fluid pressure. This counterweight system compensates for orientation-dependent pressure variations, maintaining consistent lens performance across different orientations while preserving the simple fluidic actuation structure.
Solution Approach 2:
The patent employs pre-tensioning of the membrane with specific tension values (e.g., 0.1-10 N/m) to counteract gravity-induced asymmetries. By adjusting the membrane tension parameter, the system maintains optical stability across orientations without requiring complex active control mechanisms.
2Adaptability or versatility
If the membrane is made highly distensible to enable large optical power changes, then the lens achieves high adaptability, but the membrane durability decreases
Solution Approach 1:
The patent optimizes the membrane material properties and pre-tension parameters to achieve an optimal balance between distensibility and durability. By carefully selecting membrane material characteristics and initial tension values, the system enables large optical power changes while maintaining membrane integrity and extending operational lifespan.
Solution Approach 2:
The patent applies pre-tensioning to the membrane before operation to create a protective baseline tension that prevents excessive stress during actuation. This pre-cushioning effect protects the membrane from damage while still allowing sufficient distension for large optical power changes.
3Ease of manufacture
If conventional lens materials are used, then manufacturing is straightforward, but light scattering increases reducing optical quality
Solution Approach 1:
The patent employs composite material structures, such as fluorinated polymer combinations or multi-layer configurations, that reduce light scattering while remaining manufacturable. These composite materials combine the optical benefits of low scattering with the processing advantages of conventional materials.
Solution Approach 2:
The patent modifies material optical parameters, such as refractive index matching and surface roughness control, to minimize light scattering. By adjusting these material parameters within manufacturable ranges, the system achieves reduced scattering without requiring exotic or difficult-to-process materials.
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 design enables precise control of optical power and stability across orientations, extending the lens's operational lifespan and reducing aberrations, while maintaining durability and minimizing light scattering.
Implementation Method 1
The piston ring may be adapted to apply a liquid displacement force to the membrane in a direction perpendicular to a plane of an aperture of the inner ring to cause a change in a radius of curvature of the membrane
Implementation Method 2
Pressurization of the fluid causes the membranes to bulge, thereby controllably altering the optical power of the lens. The elastic energy of the membranes provides the restoring force which prevails, once the actuating force is diminished.
Implementation Method 3
using materials like silicone-based polymers and fluorinated fluids for reduced light scattering
Data Source
AI summary
A fluidic lens may have a transparent window member, a transparent distensible membrane, an inner ring between the window member and membrane, and a top ring disposed such that the membrane is between the piston ring and the inner ring. A layer of liquid may be stored between the window member, the inner ring and the membrane. The top ring may be adapted to apply a liquid displacement force to the membrane in a direction perpendicular to a plane of an aperture of the inner ring to cause a change in a radius of curvature of the membrane. The membrane may be pre-tensioned prior to assembly with the other components.