Fluid-Damped Vibration Actuator for Wide-Band Output
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Solution Overview
Problem
Existing vibration actuators face challenges in achieving size reduction while maintaining high output and generating vibrations across a wide frequency band suitable for various environments.
Innovation Solution
A vibration actuator design featuring a movable body with a magnet and a fixing body, where the movable body is supported via elastic support parts within a gap, and a fluid flow is directed opposite to the movement direction to generate pipe resistance, allowing for a wide frequency band operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the vibration actuator is reduced in size, then the device compactness is improved, but the vibration output and frequency band are deteriorated
Solution Approach 1:
The patent introduces a fluid (air) flow mechanism through the gap between the movable body and fixing body. The fluid flow generates pipe resistance that acts as a damping force, enabling the vibration actuator to produce suitable vibration output across a wide frequency band while maintaining a reduced size. This pneumatic/hydraulic approach replaces traditional mechanical damping structures.
Solution Approach 2:
The patent changes the physical state and flow characteristics of the fluid in the gap to control the pipe resistance. By adjusting fluid flow parameters (flow rate, viscosity, density) and gap dimensions, the actuator achieves wide frequency band operation with appropriate vibration output despite its compact size.
2Volume of moving object
If the vibration actuator is reduced in size, then the device compactness is improved, but the frequency band width is deteriorated
Solution Approach 1:
The fluid flow mechanism provides frequency-dependent damping characteristics that enable the compact actuator to operate effectively across a wide frequency band. The pipe resistance generated by fluid flow varies with frequency, allowing the actuator to adapt to different operating conditions and environments.
Solution Approach 2:
The fluid-filled gap structure serves multiple functions simultaneously: it provides damping, controls resonance, and enables wide frequency band operation. This multi-functional design allows the compact actuator to be versatile and adaptable to various application environments.
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 design enables suitable vibration output across a wide frequency band while maintaining a reduced size, suitable for handheld and wearable devices.
Implementation Method 1
a coil is disposed in a state of being attached to the other plate-shaped elastic body. When electric currents having different frequencies are given to the coil in a switching manner through an oscillation circuit, the pair of plate-shaped elastic bodies selectively resonates to generate a vibration and the yoke vibrates
Implementation Method 2
the main body part supports the movable body via an elastic support part such that the movable body is vibratable in an axial direction of the movable body
Implementation Method 3
The vibration actuator is configured to cause a flow of a fluid in a direction opposite to a direction of movement of the movable body in the gap and to generate a pipe resistance to the fluid
Data Source
AI summary
Provided is a vibration actuator including: a movable body including a magnet having a pillar shape; and a fixing body including a coil and a main body part. The main body part includes an inner peripheral surface, which surrounds the movable body with a gap between the inner peripheral surface and an outer peripheral surface of the movable body inside the coil, and supports the movable body via an elastic support part such that the movable body is vibratable in an axial direction of the movable body. The vibration actuator is configured to cause a flow of a fluid in a direction opposite to a direction of movement of the movable body in the gap and to generate a pipe resistance to the fluid.