Electromechanical Polymer Linear Resonant Actuator
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Solution Overview
Problem
Conventional linear resonant actuators are limited by narrow bandwidth, high power consumption, and size constraints, making them unsuitable for many mobile applications, and require difficult resonance tuning and hazardous high voltages for operation.
Innovation Solution
The development of electromechanical polymer (EMP)-based linear resonant actuators with a substrate-mounted EMP actuator, inertial mass element, and clamping structures that allow vibration in response to electrical stimulation, using lower voltages and optimized contact surfaces for enhanced stability and vibration amplitude, and optionally featuring two out-of-phase EMP actuators for reinforced vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional linear resonant actuators are used, then they can provide haptic response, but they have narrow bandwidth and high power consumption
Solution Approach 1:
The patent replaces the conventional electromagnetic actuator with an electromechanical polymer (EMP) actuator. The EMP actuator uses electroactive polymer material that converts electrical energy directly to mechanical motion through electrostatic actuation, eliminating the need for traditional electromagnetic coils, magnets, and complex mechanical resonance structures. This substitution enables wider bandwidth operation and reduced power consumption while maintaining haptic response capability
Solution Approach 2:
The patent changes the fundamental operating parameters by using EMP material properties (electrostatic actuation characteristics) instead of electromagnetic parameters. The EMP actuator operates at lower voltages and frequencies, enabling broader bandwidth operation. The contact surface area parameters are also optimized to enhance vibration amplitude efficiency, allowing the system to achieve effective haptic feedback with lower power input
2Volume of moving object
If conventional linear resonant actuators are used, then they can create vibration, but they are limited in size and require significant power
Solution Approach 1:
The EMP actuator replaces bulky electromagnetic components with thin-film polymer structures that can be deposited on flexible substrates. This enables miniaturization while maintaining actuation force. The inertial mass element is also miniaturized and strategically positioned to maximize vibration efficiency with minimal power input
Solution Approach 2:
The patent uses composite structures combining EMP material layers, flexible substrate, clamping structures, and inertial mass elements. This composite design enables the actuator to achieve high power density in a compact form factor, delivering strong haptic feedback while consuming minimal power and occupying minimal space
3Ease of operation
If conventional linear resonant actuators are used, then they can provide haptic feedback, but resonance tuning is difficult
Solution Approach 1:
The EMP actuator provides dynamic control capability where the actuation frequency and amplitude can be electronically adjusted without mechanical tuning. The resonant frequency can be programmatically controlled through software, eliminating the need for physical resonance tuning mechanisms. This dynamic adjustment simplifies operation while reducing device complexity
Solution Approach 2:
The patent replaces mechanical resonance tuning mechanisms with electronic control of the EMP actuator. Instead of adjusting physical parameters like mass distribution or spring stiffness, the resonant characteristics are controlled through electrical signals, making tuning straightforward and eliminating complex mechanical adjustment components
4Reliability
If conventional linear resonant actuators are used, then they can operate, but they require hazardous high voltages
Solution Approach 1:
The EMP actuator uses electrostatic actuation at low voltages (typically 50-200V) compared to high-voltage electromagnetic actuators. The electroactive polymer material efficiently converts low-voltage electrical energy into mechanical motion, eliminating the need for hazardous high-voltage power supplies and improving operational safety for handheld devices
Solution Approach 2:
The patent changes the voltage parameter from high voltage (hazardous) to low voltage (safe) operation. The EMP material properties enable efficient actuation at low voltages, and the device design optimizes the electric field distribution to maximize actuation effectiveness while maintaining safe operating voltages that eliminate electrical hazard concerns
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 EMP-based actuators provide improved power efficiency, wider bandwidth, and reduced size, enabling effective haptic responses in handheld devices with lower voltage requirements and enhanced stability, while maintaining high definition haptic capabilities.
Implementation Method 1
an electromechanical polymer (EMP) actuator... in response to an electrical stimulation of the EMP actuator
Implementation Method 2
an inertial mass element having a contact surface for attaching to the substrate... Driving the mass in reciprocal motion about the central quiescent position causes a vibration
Implementation Method 3
The mass may also be attached to a spring, which helps it return to a central quiescent position
Implementation Method 4
linear resonant actuators... Driving the mass in reciprocal motion about the central quiescent position causes a vibration
Data Source
AI summary
A linear resonant actuator includes: (a) an electromechanical polymer (EMP) actuator; (b) a substrate having a first surface and a second surface, the EMP actuator being mounted on the first surface of the substrate; (c) clamping structure provided on two sides of the substrate so as to allow the substrate to vibrate freely between the two sides of the substrate, in response to an electrical stimulation of the EMP actuator; and (d) an inertial mass element having a contact surface for attaching to the substrate at the second surface of the substrate. The inertial mass element may include contact structures provided to attach to the substrate along thin parallel lines. In one embodiment, the inertial mass element may have a âTâ shape, or any suitable shape for stability.