Structured Nanovoided Polymer Actuators for Bidirectional Displacement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electromechanical devices, such as actuators, often exhibit asymmetric output forces and compromised expansive capabilities, limiting their efficiency and versatility in applications like virtual and augmented reality systems where bidirectional displacement is required.
Innovation Solution
The development of nanovoided polymer-based actuators with structured layers and negative stiffness springs, which utilize inkjet printing to create nanovoided polymer materials with high surface area-to-volume ratios and controlled deformation responses, enabling enhanced expansive forces without compromising compressive force output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If nanovoided polymer materials with high surface area-to-volume ratios are used, then energy and power densities are enhanced, but manufacturing complexity increases
Solution Approach 1:
The patent utilizes porous nanovoided polymer materials with controlled void structures to achieve high surface area-to-volume ratios. This porous architecture enhances energy and power densities by providing increased active material surface area for electrochemical reactions while maintaining low density. The controlled porosity is integrated into the actuator structure to optimize performance without excessive manufacturing complexity.
Solution Approach 2:
The patent employs composite materials combining nanovoided polymers with conductive fillers and electrode structures. This composite approach enables simultaneous achievement of high power density through enhanced electrical conductivity and mechanical flexibility, while the integrated composite structure reduces manufacturing steps compared to assembling separate components.
2Adaptability or versatility
If bidirectional displacement capability is implemented, then versatility in VR/AR applications is improved, but device complexity increases
Solution Approach 1:
The patent achieves bidirectional displacement capability through a unified actuator design that can generate forces in both expansion and compression directions. The asymmetric structured actuator serves multiple functions: it provides controlled expansion, controlled compression, and can be configured in series arrangements to achieve complex motion patterns. This multi-functionality in a single device structure reduces overall system complexity compared to using separate actuators for each direction.
Solution Approach 2:
The patent implements bidirectional displacement through segmented actuator stacks arranged in series configurations. Each stack can be independently controlled to produce displacement in specific directions, and by coordinating multiple stacks, complex bidirectional motion is achieved. This segmentation allows independent optimization of each stack while achieving versatile overall 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
These actuators achieve higher energy and power densities, improved mechanical durability, and bidirectional displacement efficiency, making them suitable for advanced applications in virtual and augmented reality systems and other optical and mechanical systems.
Implementation Method 1
Each stack may include a first electroactive polymer layer and a second electroactive polymer layer. The electroactive polymer layers may be poled PVDF or copolymers, such as PVDF-TrFE. The nanovoided polymer layers may be formed by inkjet printing.
Implementation Method 2
The development of nanovoided polymer-based actuators with structured layers and negative stiffness springs, which utilize inkjet printing to create nanovoided polymer materials with high surface area-to-volume ratios and controlled deformation responses
Implementation Method 3
The development of nanovoided polymer-based actuators with structured layers and negative stiffness springs
Data Source
AI summary
An actuator assembly includes (i) a first actuator stack having a first primary electrode, a first secondary electrode overlapping at least a portion of the first primary electrode, and a first electroactive layer disposed between and abutting the first primary electrode and the first secondary electrode, (ii) a second actuator stack having a second primary electrode, a second secondary electrode overlapping at least a portion of the second primary electrode, and a second electroactive layer disposed between and abutting the second primary electrode and the second secondary electrode; and (iii) a bonding layer disposed between the first actuator stack and the second actuator stack.