Nested Dual-Movable Vibration Actuator for Multi-Band Output
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Solution Overview
Problem
Existing vibration actuators struggle to generate various vibration outputs with different frequency bands while maintaining a compact size.
Innovation Solution
A vibration actuator design featuring a housing with a first movable part, including a magnet, and a second movable part, including a coil, both supported by elastic support parts. This configuration allows for independent movement of the parts, enabling the generation of vibrations across different frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single movable part configuration is used, then the actuator structure is simple, but the vibration output is limited to a single frequency band
Solution Approach 1:
The movable part is divided into two independent segments: a first movable part with a magnet and a second movable part with a coil. Each segment can move independently in the vibration direction, allowing the actuator to generate vibrations at different frequency bands simultaneously or separately, thus expanding the vibration frequency range without requiring multiple separate actuators
Solution Approach 2:
The first movable part is disposed inside the second movable part in a nested configuration. The first movable part with the magnet is positioned coaxially within the second movable part that contains the coil. This nested arrangement allows both movable parts to move independently while sharing the same space, achieving multi-frequency vibration capability without significantly increasing the overall actuator size
2Adaptability or versatility
If multiple separate actuators are used to generate different vibration frequencies, then the vibration frequency range is expanded, but the overall device size increases
Solution Approach 1:
The first movable part is disposed inside the second movable part in a nested configuration. The first movable part with the magnet is positioned coaxially within the second movable part that contains the coil. This nested arrangement allows both movable parts to move independently while sharing the same space, achieving multi-frequency vibration capability without significantly increasing the overall actuator size
Solution Approach 2:
Two vibration generation systems (first movable part with magnet and second movable part with coil) are merged into a single integrated actuator structure. Both systems share common components such as the housing, elastic support parts, and magnetic circuit elements, allowing multi-frequency vibration generation while maintaining a compact form factor
3Volume of moving object
If a compact actuator design is used, then the device size is reduced, but the vibration output stability deteriorates
Solution Approach 1:
Different regions of the actuator are designed with specialized functions: the first movable part with magnet is optimized for generating vibrations in one frequency band, while the second movable part with coil is optimized for another frequency band. Each region has tailored electromagnetic parameters and mechanical properties to ensure stable vibration output in its designated frequency range, maintaining overall vibration stability in a compact design
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 effectively generates stable and varied vibration outputs across different frequency bands, while reducing the overall size of the device.
Implementation Method 1
Vibration is generated by driving the first movable part and the second movable part through energization to the coil part
Implementation Method 2
a first elastic support part joined at both end portions of the magnet part in an axis direction
Data Source
AI summary
This vibration actuator includes: a housing; a first movable part that has a magnet part and is disposed in such a manner as to be capable of reciprocating in a vibration direction that is along the axial direction, such reciprocation being within the housing and via a first elastic support part joined to both ends of the magnet part, the ends being separated in the axial direction of the magnet part; and a second movable part that has a coil part disposed to surround the magnet part, and that is disposed so as to be capable of reciprocating along the vibration direction at the outer periphery of the first movable part such reciprocation being within the housing and via a second elastic support part joined to both ends of the coil part, the ends being separated in the axial direction of the coil part.