Dielectric Composite for Transducer Compliance Control

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Solution Overview

Problem

Existing transducers using electroactive polymers face challenges in controlling the direction of compliance of corrugated electrodes, leading to high electrical resistance and prolonged response times, which limits actuation force and efficiency.

Innovation Solution

A composite structure with a dielectric film having a surface pattern of raised and depressed portions, where a conductive layer is deposited to replicate the surface pattern, allowing for elongation in one direction without stretching the conductive layer, thereby enhancing compliance and reducing electrical resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If corrugated electrodes are used to provide compliance, then the transducer can deflect in a compliant direction, but the direction of compliance becomes difficult to control and electrical resistance increases

Engineering Contradiction:

Improvecompliance controlVSAvoidelectrical resistance

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The electrode is segmented into multiple parallel metal traces instead of a continuous corrugated structure. This segmentation allows independent control of electrical pathways while maintaining compliance through the patterned arrangement, reducing electrical resistance by providing multiple parallel conduction paths.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the electrode structure are assigned different properties: metal traces provide high conductivity in specific directions, while the charge distribution layer provides compliance and charge facilitation. This local differentiation optimizes both electrical performance and mechanical compliance control.

Inventive Principle:

Principle #3Local quality

2Reliability

If the electrically conductive layer is made rigid to reduce electrical resistance, then electrical resistance decreases, but the transducer loses compliance and ability to deflect

Engineering Contradiction:

Improveelectrical resistanceVSAvoidcompliance

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The electrode system uses a composite structure combining metal traces (for low electrical resistance) with a charge distribution layer (for compliance). The charge distribution layer has intermediate conductance properties, bridging the gap between rigid metal and flexible polymer, allowing the structure to maintain both electrical efficiency and mechanical compliance.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

Compliance is achieved not by making the conductive layer itself flexible, but by introducing a dimensional pattern (parallel traces with spacing) that allows deflection in the compliant direction while maintaining electrical connectivity through the trace network.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Ease of operation

If the transducer structure is made more complex to control compliance direction, then compliance control improves, but manufacturing complexity and device complexity increase

Engineering Contradiction:

Improvecompliance direction controlVSAvoidstructure complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The charge distribution layer serves multiple functions simultaneously: it facilitates charge distribution between metal traces, provides mechanical compliance, and enables directional deflection control. This multi-functionality reduces the need for separate components, simplifying the overall device structure while maintaining compliance control.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The metal traces and charge distribution layer are applied to opposite surfaces of the polymer in a pre-configured pattern before actuation. This preliminary structuring establishes the compliance direction and charge distribution pathways in advance, simplifying the actuation process and reducing operational complexity.

Inventive Principle:

Principle #10Preliminary action

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 increased actuation force, improved reaction time, and extended lifetime of transducers by providing precise control over compliance direction and reducing electrical resistance, allowing for efficient conversion between mechanical and electrical energies.

Implementation Method 1

An electrically conductive layer is deposited onto the surface pattern and forms an electrode layer thereon

Methodology Applied

Scientific EffectPhysical Vapour Deposition: Physical Vapour Deposition

Implementation Method 2

An electrical potential difference between two electrodes located on opposite surfaces of an elastomeric body generates an electric field leading to a force of attraction

Methodology Applied

Scientific EffectDielectric Elastomer Actuation: Dielectric

Data Source

PatentUS7880371B2Dielectric composite and a method of manufacturing a dielectric composite

Publication Date: 2011.02.01 DANFOSS AS

AI summary

A composite for a transducer facilitates an increased actuation force as compared to similar prior art composites for transducers. The composite facilitates increased compliance of the transducer in one direction, an improved reaction time as compared to similar prior art composites for transducers, and provides an increased lifetime of the transducer in which it is applied.