Fluid Lens Zero-Strain Membrane Guide Path
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Solution Overview
Problem
Conventional fluid lenses require high actuation forces to adjust optical power, limiting their compactness and efficiency, as the strain energy in the membrane changes significantly during adjustment, necessitating larger and more power-hungry actuators.
Innovation Solution
The development of a 'zero-strain' fluid lens configuration where the membrane profile adjustment occurs without appreciable change in elastic energy, using a pre-strained flexible membrane with a guide wire or support structure that allows control points to move along guide paths without altering the membrane's strain energy, reducing actuation forces by an order of magnitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional fluid lens adjustment methods are used, then optical power can be changed, but high actuation forces are required
Solution Approach 1:
The patent applies equipotentiality by designing a membrane configuration where the control points move along equipotential lines of the elastic energy field. The guide paths are specifically shaped so that the membrane remains at constant strain energy throughout the adjustment process, eliminating the need for actuators to overcome varying elastic forces. This is achieved through mathematical optimization of the guide path geometry to maintain constant energy potential.
Solution Approach 2:
The patent changes the geometric parameters of the membrane and guide paths to achieve constant strain energy. By optimizing the shapes of the membrane, guide paths, and support structures, the system transitions from conventional adjustment methods to a configuration where elastic energy remains invariant during optical power changes. This parameter optimization directly reduces the actuation force required.
2Power
If conventional fluid lenses are used, then optical power adjustment is possible, but larger and more power-hungry actuators are needed
Solution Approach 1:
By maintaining constant elastic energy throughout the adjustment range, the system eliminates the need for high-power actuators. The equipotential configuration means actuators only need to overcome minimal friction and inertia, not significant elastic restoring forces. This dramatically reduces both the power consumption and physical size of the actuators required.
Solution Approach 2:
The patent replaces the conventional mechanical actuation system that must directly overcome large elastic forces with a system that utilizes geometric constraints and energy conservation. The guide path geometry and membrane configuration substitute for mechanical force multiplication, allowing much smaller actuators to achieve the same optical power adjustment range.
3Reliability
If membrane profile is adjusted in conventional fluid lenses, then optical power changes, but elastic strain energy changes significantly
Solution Approach 1:
The patent creates an equipotential system where the membrane operates at constant elastic energy during adjustment. The guide paths are mathematically optimized to ensure that as control points move to change the membrane profile, the overall strain energy remains invariant. This provides stable optical performance without energy fluctuations.
Solution Approach 2:
The patent introduces dynamic geometric adaptation where the guide path shapes and membrane configurations are specifically designed to maintain constant energy states. The system dynamically adjusts the geometric parameters of the guide paths and support structures to ensure that energy conservation is maintained throughout the adjustment range, enabling reliable optical performance.
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 configuration significantly reduces the actuation force required, enabling smaller, more efficient actuators and a more compact form factor, while maintaining optical performance, by keeping the strain energy constant during adjustments.
Implementation Method 1
a pre-strained flexible membrane with a guide wire or support structure that allows control points to move along guide paths without altering the membrane's strain energy
Data Source
AI summary
Examples include a device including a fluid lens having a membrane (that may be in elastic tension), a substrate, a fluid at least partially enclosed between the membrane and the substrate, and a support structure configured to provide a guide path for an edge portion of the membrane, such as a membrane attachment at a periphery of the membrane. The guide path may be configured to greatly reduce (or substantially eliminate) changes in the elastic energy of the membrane as the membrane profile is adjusted. The guide path may be configured so that the elastic force exerted by the membrane is generally normal to the guide path for each location on the guide path. Adjustment of the membrane profile may include applying an actuation force that is normal to the elastic force exerted by the membrane. Various other methods and apparatus are also disclosed.