Magnetic Circuit Vibration Module for Thin Devices With Strong Force
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Solution Overview
Problem
Existing vibration generating devices for electronic devices are not adequately thinned or downsized to meet the requirements for compact designs while maintaining effective vibration generation.
Innovation Solution
A vibration generating device with a magnetic circuit comprising a base, a plate, an annular coil, and elastic members, where the plate and base form a magnetic circuit with a protruding part and a flange part, and the elastic members support the plate to enhance magnetic attraction and vibration efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the vibration generating device is thinned or downsized, then the device size is reduced, but the vibration force generation capability deteriorates
Solution Approach 1:
The device is segmented into distinct functional components: a base with protruding part, a plate with recessed part, elastic members for support, and an annular coil. This segmentation allows each component to be optimized for its specific function while maintaining a compact overall structure, resolving the contradiction between small size and effective vibration generation.
Solution Approach 2:
The plate with recessed part is nested within the base structure, and the annular coil is positioned around the protruding part. This nesting arrangement maximizes the use of available space, allowing the device to maintain compact dimensions while incorporating all necessary components for effective vibration force generation.
2Device complexity
If the magnetic circuit structure is simplified, then the device complexity is reduced, but the magnetic efficiency deteriorates
Solution Approach 1:
The magnetic circuit is designed with local quality variations: the protruding part and recessed part create concentrated magnetic flux paths, while the annular coil provides localized magnetic field generation. This localized optimization of magnetic properties maintains high magnetic efficiency without requiring a complex overall structure.
Solution Approach 2:
The base and plate are merged to form an integrated magnetic circuit structure, eliminating the need for separate magnetic path components. This merging simplifies the overall device complexity while maintaining efficient magnetic flux transmission through the integrated structure.
3Length of stationary object
If the plate is positioned closer to the base, then the device thickness is reduced, but the vibration transmission efficiency deteriorates
Solution Approach 1:
The plate is supported by elastic members that allow dynamic movement between the plate and base. This dynamic support system enables the plate to be positioned close to the base for thin device profile while maintaining optimal vibration transmission efficiency through elastic coupling that adapts to vibration demands.
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 solution enables the generation of a strong vibration force in a compact form, allowing for efficient vibration transmission to electronic devices while preventing abnormal noise and improving magnetic efficiency.
Implementation Method 1
an annular coil surrounding the protruding part
Implementation Method 2
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.