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US 2010/0150381 A1Published application
Micro-speaker and manufacturing method thereof
AssigneeIndustrial Technology Research Institute
InventorsHsin-Li Lee, Chin-Horng Wang, Cheng-Hsin Chuang, Jin-Yao Lai
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Abstract
A micro-speaker and a manufacturing method thereof are provided. The micro-speaker has a sandwich structure. The micro-speaker includes two piezoelectric material layers and a diaphragm disposed between the two piezoelectric material layers, where the piezoelectric material layers have a ring-shaped structure. The problem of insufficient sound pressure at low frequency is resolved, and the flexibility of the micro-speaker is improved.
Claims18
A micro-speaker, comprising:
- a first piezoelectric material layer and a second piezoelectric material layer;
- and
- a diaphragm, disposed between the first piezoelectric material layer and the second piezoelectric material layer, wherein a peripheral area of the diaphragm is held by the first piezoelectric material layer and the second piezoelectric material layer, and a central area of the diaphragm is served as a vibrating area of the micro-speaker for producing sound.
A manufacturing method of a micro-speaker, comprising:
- forming two piezoelectric material layers by piezoelectric materials;
- forming with metal electrodes at both sides of each of the piezoelectric material layers;
- cutting the two piezoelectric material layers to form a first piezoelectric material layer with a hollow area and a second piezoelectric material layer with a hollow area;
- forming a diaphragm;
- and
- combining the first piezoelectric material layer, the diaphragm, and the second piezoelectric material layer to form a sandwich structure, wherein the diaphragm is disposed between the first piezoelectric material layer and the second piezoelectric material layer, a peripheral area of the diaphragm is held by the first piezoelectric material layer and the second piezoelectric material layer, and a central area of the diaphragm is exposed through the hollow areas and the central area served as a working area of the micro-speaker for producing sound through the hollow areas of the first piezoelectric material layer and the second piezoelectric material layer.
3 more elements
Dependencies are inferred from the claim text.