Microactuator Extender Structure for Fast, Low-Power Deflection
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Solution Overview
Problem
Existing microactuators are not fast enough, difficult to miniaturize, and require high electrical voltage, which is a challenge for applications like optical coherence tomography.
Innovation Solution
A thermally-actuated microactuator with an extender comprising voids to reduce thermal mass and length, allowing for faster deflection with lower electrical power consumption, and a bimorph structure with layers of different thermal expansion coefficients for enhanced actuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If existing microactuator designs are used, then structural integrity is maintained, but deflection speed is insufficient and device size cannot be miniaturized
Solution Approach 1:
The microactuator is divided into two functional segments: a heated bimorph section for actuation and a cold extender section for deflection amplification. This segmentation allows the heated portion to be short and fast-responding while the extender provides additional deflection leverage without requiring heat, thereby increasing deflection speed and enabling miniaturization.
Solution Approach 2:
The extender section is positioned at an angle (e.g., 90 degrees) relative to the bimorph section, creating a L-shaped configuration. This dimensional change allows the extender to amplify deflection in a direction perpendicular to the heating section, increasing effective deflection without increasing the thermal response path length.
2Speed
If high electrical voltage is applied to achieve fast deflection, then deflection speed improves, but power consumption increases
Solution Approach 1:
The cold extender section acts as a mechanical intermediary that amplifies the small deflection of the heated bimorph section into a larger overall deflection. This mechanical leverage allows fast deflection to be achieved with lower heating power, reducing electrical energy consumption while maintaining high deflection speed.
Solution Approach 2:
By changing the geometric parameters of the extender (length, cross-sectional area, position), the mechanical advantage is optimized to amplify deflection. This allows the system to achieve fast deflection with reduced thermal input power by maximizing the leverage effect of the extender section.
3Length of moving object
If the microactuator length is increased to improve deflection, then deflection range increases, but thermal mass increases and response time decreases
Solution Approach 1:
The microactuator is segmented into a short heated bimorph section and a longer cold extender section. The heated section remains short to minimize thermal mass and maintain fast response time, while the cold extender provides additional deflection range without requiring heat, thus avoiding the penalty of increased thermal mass and response time.
Solution Approach 2:
The extender is positioned at an angle to the bimorph section, creating a L-shaped configuration. This dimensional arrangement allows the extender to contribute to deflection range in a perpendicular direction without adding to the thermal path length, thereby increasing deflection range while maintaining fast thermal response.
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 solution enables rapid deflection with reduced power requirements, suitable for applications like optical coherence tomography, facilitating the development of portable and efficient systems.
Implementation Method 1
The microactuator comprises a bimorph, wherein the bimorph comprises a first layer and a second layer, and wherein the first layer and the second layer have different coefficients of thermal expansion.
Implementation Method 2
The first layer and/or the second layer is configured as a resistive heater.
Implementation Method 3
an extender configured to increase deflection of the component by the microactuator, wherein the extender comprises one or more voids
Data Source
Figure 1~3B
Figure 4A~4C
Figure 5
AI summary
An apparatus comprising: a thermally-actuated microactuator configured to deflect a component in dependence on an applied stimulus; and an extender having a length configured to increase deflection of the component by the microactuator, wherein the extender comprises one or more voids.