Variable Liquid Aperture Device Using Uneven Channel and Electrowetting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing variable aperture technologies, such as MEMS and optofluidic systems, face limitations in miniaturization and aperture ratio due to mechanical movements and friction, and require external pumps for operation, restricting their efficiency and compactness.
Innovation Solution
A variable liquid device with channels of uneven heights, utilizing a non-transmissive first fluid and a light-transmittable second fluid, where the aperture is adjusted by varying the interface between the two fluids, and an electric field is applied to control the fluid's location, allowing for symmetric movement and expansion or reduction of the fluid loop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mechanical blades are used to adjust aperture, then aperture control is achieved, but device size increases and miniaturization is restricted due to mechanical movements and friction
Solution Approach 1:
The patent replaces mechanical blade systems with a liquid-based aperture control system. A liquid lens or liquid membrane is used to adjust the aperture by changing the shape or position of the liquid, eliminating mechanical movements and friction while enabling miniaturization.
Solution Approach 2:
The patent employs liquid pressure and fluid dynamics to control the aperture. By applying pressure to a liquid membrane or liquid lens, the aperture can be adjusted without mechanical components, achieving both compact size and effective aperture control.
2Volume of moving object
If electrostatic MEMS aperture is used, then miniaturization is enabled, but aperture ratio is low (1% or less) and gap between blades reduces effectiveness
Solution Approach 1:
The patent changes the physical state and parameters of the aperture control medium from solid mechanical blades or electrostatic membranes to liquids. By controlling liquid pressure, shape, and position, the system achieves both miniaturization and high aperture ratios, overcoming the limitations of MEMS structures.
Solution Approach 2:
The patent utilizes the fluid phase of liquids to create a flexible, continuous aperture control mechanism. The liquid can be pressed, shaped, and positioned to create variable aperture openings, achieving higher aperture ratios than solid-state MEMS devices while maintaining miniaturization.
3Productivity
If optofluidic variable aperture with PDMS membrane is used, then aperture ratio is improved, but syringe pump is required which increases device complexity and size
Solution Approach 1:
The patent employs a self-driven liquid pressure system where the liquid membrane or liquid lens automatically adjusts the aperture in response to pressure changes. This eliminates the need for external syringe pumps and complex driving mechanisms, reducing device complexity while maintaining high aperture ratios.
Solution Approach 2:
The patent replaces the mechanical syringe pump system with a fluid-pressure-based control mechanism. By using liquid pressure directly to deform the liquid membrane or lens, the system achieves aperture control without external pumping devices, simplifying the overall device structure.
4Ease of operation
If channels with uneven heights are used, then fluid flow control and aperture adjustment are improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent intentionally creates local variations in channel height to achieve specific fluid flow patterns and aperture control. By designing channels with different heights in different regions, the system controls fluid pressure and flow direction to achieve variable aperture openings, accepting that manufacturing precision must be localized rather than uniform.
Solution Approach 2:
The patent uses dynamic liquid pressure to compensate for static channel height variations. The liquid membrane or liquid lens responds to pressure changes by deforming to create the desired aperture shape, allowing the system to adapt to manufacturing tolerances in channel height while maintaining precise aperture control.
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 solution enables effective control of fluid flow and light transmittance, achieving a higher aperture ratio and miniaturization potential by balancing Laplace pressures and using electrowetting phenomena for precise aperture adjustment.
Implementation Method 1
controlling a location of the fluid by balancing Laplace pressure according to heights of channels
Implementation Method 2
using electrowetting phenomena for precise aperture adjustment
Data Source
AI summary
The variable liquid device includes: a chamber including a channel, in which a fluid flows, having an inconsistent height in at least a part of the channel; a first fluid filled in the chamber and formed of a non-transmissive material; and a second fluid filled in the chamber and formed of a light transmittable material that does not mix with the first fluid, wherein an aperture, through which light is transmitted, is adjusted according to a variation of an interface between the first fluid and the second fluid.