Annular-Coil Vibration Generator for Thin High-Force Electronics
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Solution Overview
Problem
Existing vibration generating devices for electronic devices are difficult to thin or downsize while maintaining the required vibration force.
Innovation Solution
A vibration generating device with a protruding part, a base formed with a magnetic body, an annular coil surrounding the protruding part, a plate facing the base and formed with a magnetic body, and an elastic member supporting the plate with respect to the base, forming a magnetic circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a conventional vibration generating device structure is used, then the required vibration force can be generated, but the device cannot be thinned or downsized
Solution Approach 1:
The patent transitions from a conventional coil-wound-core structure to a planar annular coil configuration where the coil lies flat in a plane. This dimensional change allows the magnetic field to be generated in a thin profile while maintaining the necessary magnetic flux density for vibration force generation, effectively resolving the contradiction between vibration force and device thickness.
Solution Approach 2:
The patent integrates multiple functional components into a unified planar structure. The base, annular coil, and plate are merged into a compact assembly where the magnetic circuit is formed by the base and plate facing each other with the coil in between. This merging eliminates the need for separate core structures and reduces overall device volume while maintaining vibration force.
2Volume of moving object
If the device is thinned or downsized, then the device size is reduced, but the vibration force generation capability is compromised
Solution Approach 1:
The patent concentrates the magnetic field generation in the localized gap region between the base and plate where the annular coil is positioned. By optimizing the magnetic circuit in this specific local area with high magnetic flux density, the device achieves effective vibration force generation despite the overall thin profile. The magnetic field is locally intensified where needed rather than requiring a large overall structure.
3Length of stationary object
If a flat magnetic body plate structure is used, then the device can be thinned, but the vibration efficiency and noise reduction are insufficient
Solution Approach 1:
The patent incorporates an elastic member that preliminarily applies a pressing force to press the plate against the base, establishing optimal magnetic circuit contact before the device operates. This preliminary action ensures that the magnetic flux path is firmly established, reducing magnetic leakage and associated noise while maintaining the thin profile. The elastic member pre-positions the components to minimize harmful effects during 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
Enables the vibration generating device and electronic devices to be thinned or downsized while maintaining a large vibration surface, improving vibration efficiency and reducing noise.
Implementation Method 1
an annular coil surrounding the protruding part... The plate and the base form a magnetic circuit
Implementation Method 2
a base formed with a magnetic body... a plate facing the base and formed with a magnetic body... The plate and the base form a magnetic circuit
Implementation Method 3
an elastic member supporting the plate with respect to the base
Data Source
AI summary
In accordance with one aspect of the present disclosure, a vibration generating device includes a protruding part; a base provided with the protruding part and formed of a magnetic body; an annular coil surrounding the protruding part; a plate facing the base and formed of a magnetic body; and an elastic member supporting the plate with respect to the base. The plate and the base constitute magnetic circuit.