Low Frequency Vibrating Actuator with Asymmetric Support
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Solution Overview
Problem
Existing low frequency vibrating actuator devices are unable to output vibrations within the frequency range that can be detected by humans, as their resonant frequencies are typically higher than the frequencies perceivable by the human body.
Innovation Solution
A low frequency vibrating actuator device is designed with a substrate, actuator, support, vibration membrane, and vibrating mass, where the actuator includes laminated insulating layers and internal electrodes, and the support's top surface area is equal to or less than its bottom surface area, allowing for efficient vibration transmission and reducing the resonant frequency to be within the human-detectable range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the actuator generates vibration at high resonant frequency, then the actuator can operate effectively, but the vibration frequency is too high for human detection
Solution Approach 1:
The patent introduces intermediate components (support structure, vibration membrane, and vibrating mass) between the actuator and the external environment. These intermediaries transform the high-frequency actuator vibration into low-frequency detectable vibration, allowing the actuator to operate at its optimal high resonant frequency while producing human-detectable low-frequency output.
Solution Approach 2:
The patent changes the physical parameters of the system by introducing a vibrating mass with specific mass and damping characteristics. This mass interacts with the actuator to shift the resonant frequency of the overall system from the actuator's high natural frequency to a lower frequency within the human detection range (20-200 Hz), while the actuator itself continues to operate at its high resonant frequency.
2Productivity
If the support top surface area is reduced to match or be less than bottom surface area, then vibration transmission efficiency improves, but the support structure becomes more constrained
Solution Approach 1:
The support structure is designed with asymmetric surface areas where the top surface area is equal to or less than the bottom surface area. This asymmetric design optimizes the vibration transmission path by concentrating the vibration energy transfer at specific contact points rather than distributing it across equal areas, thereby improving transmission efficiency while maintaining structural simplicity.
3Productivity
If the resonant frequency of the actuator is greater than the vibrating mass, then effective vibration transmission is achieved, but the frequency mismatch may cause energy loss
Solution Approach 1:
The patent utilizes periodic vibration action where the actuator operates at its high resonant frequency in a periodic manner. The vibrating mass is designed to respond to these periodic excitations, and through careful tuning of the mass and damping characteristics, the system achieves effective energy transfer from the high-frequency actuator to the low-frequency output, minimizing energy loss despite the frequency mismatch.
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 device effectively outputs low frequency vibrations of 500 Hz or less, enabling human perception of vibrations, while maintaining a resonant frequency greater than the vibrating mass, thus ensuring effective vibration transmission.
Implementation Method 1
an actuator provided on the pair of connection electrodes to generate vibration; the actuator includes a plurality of laminated insulating layers and internal electrodes that are alternately laminated between the insulating layers adjacent to each other
Implementation Method 2
a vibrating mass provided on the vibration membrane to vibrate according to the vibration membrane, wherein the actuator has a resonant frequency greater than that of the vibrating mass
Data Source
AI summary
Provided is a low frequency vibrating actuator device. The low frequency vibrating actuator device includes a substrate including a pair of connection electrodes, an actuator provided on the pair of connection electrodes to generate vibration, a support provided on the actuator, a vibration membrane provided on the support to vibrate according to the actuator, and a vibrating mass provided on the vibration membrane to vibrate according to the vibration membrane. The actuator includes a plurality of laminated insulating layers and internal electrodes that are alternately laminated between the insulating layers adjacent to each other, and a top surface of the support, which contacts the vibration membrane, has an area that is equal to or less than that of a bottom surface of the support, which contacts the actuator.