Stacked Actuating Electrode Structure for Electrical Isolation
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Solution Overview
Problem
Existing techniques for electrically induced mechanical movement in devices, such as Eccentric Rotating Mass (ERM) vibration motors and linear resonant actuators, face issues like high power consumption, low durability, complex designs, and poor scalability, especially on flexible surfaces, leading to challenges in achieving effective electrical isolation and preventing sparks between layers in stacked structures.
Innovation Solution
A stacked structure comprising at least two active element layers with conductive surfaces, an elastic layer of nodules, and conductive adhesive for electrical connection, which provides rigidity, electrical isolation, and a simple manufacturing process to prevent sparks and lateral displacement, using book binding edges and adhesive connections for enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If traditional ERM vibration motors or LRA are used for electrically induced mechanical movement, then mechanical actuation is achieved, but power consumption is high and device complexity increases
Solution Approach 1:
The patent replaces traditional mechanical actuation systems (ERM motors, LRA) with an electrostatic actuation system that uses electric fields to directly deform an elastomeric membrane. This substitution eliminates complex mechanical components like rotating masses, magnets, and springs, resulting in lower power consumption and reduced device complexity while achieving the same tactile feedback function
Solution Approach 2:
The patent changes the fundamental actuation mechanism from mechanical (motor-driven) to electrostatic (field-driven). By applying voltage differences across conductive layers, the system exploits electrostatic forces to deform the elastomeric membrane, fundamentally altering the physical parameter space from mechanical rotation/movement to electrical field control
2Adaptability or versatility
If stacked structures are used to improve actuation performance, then scalability is enhanced, but electrical isolation between layers becomes difficult and sparks may occur
Solution Approach 1:
The patent introduces an elastomeric membrane as an intermediary layer between stacked conductive elements. This membrane serves as both a mechanical substrate that transmits actuation forces and an electrical insulator that prevents sparking between layers. The elastomeric material with dielectric properties acts as a mediator that enables close stacking while maintaining electrical isolation
Solution Approach 2:
The patent employs composite structures combining conductive materials (for electrodes) with elastomeric insulating materials (for isolation and mechanical support). This composite approach allows the stacked layers to be placed in close proximity for enhanced actuation performance while the elastomeric layers provide necessary electrical isolation to prevent sparks
3Reliability
If conductive surfaces are placed close together for better electrical connection, then electrical connectivity is improved, but lateral displacement between layers increases
Solution Approach 1:
The patent extracts the electrical connection function from direct physical contact between conductive surfaces and implements it through the elastomeric membrane medium. The conductive layers are connected electrically through the insulating elastomeric material rather than through direct contact, which allows close spacing for good connectivity while the elastomeric layer physically prevents lateral displacement
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 achieves effective electrical isolation, prevents sparks between layers, and enhances the robustness and scalability of stacked structures for electrically induced mechanical movement, while maintaining cost-effective manufacturing and scalability.
Implementation Method 1
an electrostatic actuator configured to compress in response to a voltage difference between the first and second electrodes
Implementation Method 2
the elastic layer comprising a plurality of elastic nodules spanning the compression space and contacting the second substrate, the plurality of elastic nodules configured to be compressed by relative movement of the first conductive surface and the second conductive surfaces toward each other in response to a voltage difference
Implementation Method 3
a conductive adhesive contacting at least the connecting region of the first conductive surface and the connecting region of the second conductive surface; and a conductive element coupled to the conductive adhesive, for electrically connecting the two AE layers
Implementation Method 4
Each of the first conductive surface and the second conductive surface is totally formed on its respective substrate with no exposed edges. This configuration provides robust electrical isolation that prevents sparks from occurring between stacked AE layers
Data Source
AI summary
A stacked structure formed of two active element (AE) layers includes: a first substrate; a second substrate; a first conductive surface and a second conductive surface totally formed on the first substrate and second substrate, respectively, and including an active region and a connecting region; a compression space between the first active region of the first conductive surface and the second substrate; an elastic layer including a plurality of elastic nodules spanning the compression space and contacting the second substrate, formed on the active region of the first conductive surface or on an exposed surface of the second substrate, the elastic nodules compressed in response to a voltage difference between the first and second conductive surfaces or to an external force; a conductive adhesive contacting the connecting region of the first and second conductive surfaces; and a conductive element coupled to the conductive adhesive, for electrically connecting the AE layers.