Plate-Spring Vibration Actuator for Quiet Shock-Resistant Output
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional vibration actuators with a shaft for movable body sliding suffer from sliding noise, which reduces vibration amplitude, and existing solutions fail to achieve high output vibration without noise while ensuring impact resistance.
Innovation Solution
A vibration actuator design featuring a movable body with a magnet inside a coil, supported by elastic leaf springs that prevent contact with the coil holding part, allowing for high-amplitude vibration without noise and impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shaft is provided for the movable body to slide on, then shock resistance is improved, but sliding noise is generated
Solution Approach 1:
The patent replaces the mechanical sliding contact system (movable body sliding on shaft) with an elastic support system (leaf springs). This substitution eliminates direct mechanical contact between moving parts, thereby removing the source of sliding noise while maintaining shock resistance through the elastic deformation capability of the leaf springs.
Solution Approach 2:
The patent introduces leaf springs as an intermediary element between the movable body and the shaft. Instead of direct contact, the leaf springs mediate the interaction, allowing the movable body to be supported and guided while accommodating shocks through elastic deformation, thus preventing noise-generating sliding contact.
2Reliability
If the distance between magnet and coil is increased to prevent contact, then coil damage from impact is reduced, but vibration output is reduced
Solution Approach 1:
The patent employs dynamic positioning of the movable body through elastic leaf springs, allowing the system to adapt its configuration during operation. The leaf springs enable controlled movement and positioning that maintains optimal magnet-coil spacing for vibration output while dynamically protecting against impact forces through elastic deformation.
Solution Approach 2:
The patent implements beforehand cushioning by positioning the movable body at an optimal distance from the coil using leaf springs with predetermined elastic properties. This pre-configured spacing provides a cushioning effect that prevents direct impact contact while maintaining effective vibration coupling during normal operation.
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 high-output vibration transmission with reduced noise and enhanced impact resistance, ensuring effective sensory feedback in electronic devices.
Implementation Method 1
a movable body 20 including a magnet 30... configured to vibrate with respect to the fixing body 50 by cooperation of the magnet and the coil to which power is fed
Implementation Method 2
an elastic support part 81, 82... the leaf springs support the movable body 20 such that the movable body is movable in the vibration direction
Data Source
AI summary
This vibration actuator has: a stationary body having a coil; a movable body having a magnet disposed radially inside the coil; and an elastic support part for supporting the movable body so that the movable body can move relative to the stationary body. The stationary body has a coil holding part. The coil holding part has, on the inner diameter side of the coil, a coil protection wall part. The elastic support part has at least two or more plate springs bridged between the coil holding part and the movable body so as to sandwich the movable body in a vibration direction. In order that the movable body does not come into contact with the coil holding part when not vibrating and when vibrating, the plate springs support the movable body so that the movable body is movable in the vibration direction.