Leaf-Spring Vibration Actuator Structure for Quiet High-Output Motion
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Solution Overview
Problem
Conventional vibration actuators experience noise generation due to sliding contact between the movable body and the shaft, reducing the amplitude of vibration and impacting durability.
Innovation Solution
A vibration actuator design featuring a movable body with a magnet inside a coil, supported by elastic support parts comprising leaf springs, which prevent contact between the magnet and coil, allowing for high-output vibration without noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shaft on which the movable body slides is provided in the fixing body to regulate movement and improve shock resistance, then impact resistance is improved, but sliding noise is generated during driving
Solution Approach 1:
The patent removes the shaft component from the fixing body that caused sliding noise. Instead of using a shaft for the movable body to slide on, the invention uses a different structural approach where the movable body is supported by elastic elements (springs) that allow movement without sliding contact, thereby eliminating the noise-generating sliding interface while maintaining movement regulation and shock resistance
Solution Approach 2:
The patent replaces the mechanical sliding contact system (movable body sliding on shaft) with an elastic support system (springs). This substitution eliminates direct sliding friction and contact noise while providing the necessary movement regulation and shock absorption through elastic deformation rather than rigid sliding contact
2Reliability
If the distance between the magnet and coil is increased to prevent contact and damage, then reliability is improved, but vibration amplitude is reduced
Solution Approach 1:
The patent employs elastic springs as dynamic support elements between the movable body (containing magnet) and the fixing body (containing coil). These springs allow the system to maintain a controlled dynamic distance that prevents direct contact and damage during normal operation and under shock conditions, while still enabling sufficient proximity for effective electromagnetic interaction and maintaining vibration amplitude through elastic energy storage and release
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 actuator achieves high-output vibration with impact resistance and reduced noise, ensuring effective vibration transmission to the user.
Implementation Method 1
a movable body including a magnet disposed inside the coil in a radial direction such that the magnet is relatively movable in a vibration direction orthogonal to the radial direction, the movable body being configured to vibrate with respect to the fixing body by cooperation of the magnet and the coil to which power is fed
Implementation Method 2
the elastic support part includes at least two or more leaf springs provided across the coil holding part and the movable body to sandwich the movable body in the vibration direction, and wherein the leaf springs support the movable body such that the movable body is movable in the vibration direction without making contact with the coil holding part
Data Source
AI summary
A vibration actuator includes: a movable body which includes a stack formed by a magnet, a pair of magnetic cores and a pair of non-magnetic weights, is supported at both upper and lower sides of the movable body by a pair of leaf springs made of a magnetic material connected respectively to the pair of non-magnetic weights, and is operable to move vertically inside of a coil of a fixing body. The fixing body further includes a magnetic cylindrical body which is disposed outside of the coil, and has a length, the length being longer than a distance between upper and lower ends of the pair of magnetic cores and shorter than a distance between the pair of leaf springs.