Wafer level package of MEMS microphone and manufacturing method thereof
First Claim
1. A wafer level package of micro electromechanical system (MEMS) microphone, comprising:
- a substrate;
a plurality of dielectric layers stacked on the substrate;
a MEMS diaphragm disposed between two adjacent dielectric layers of the dielectric layers, and a first chamber being formed between the MEMS diaphragm and the substrate;
a plurality of supporting rings disposed in some of the dielectric layers respectively and stacked with each other, and the supporting rings surrounding the MEMS diaphragm;
a protective layer disposed on the upmost supporting ring and above the MEMS diaphragm, a second chamber being formed between the MEMS diaphragm and the protective layer, and the protective layer defining a plurality of first through holes for exposing the MEMS diaphragm therefrom; and
a guard ring, wherein the guard ring is located in some of the dielectric layers under the MEMS diaphragm and surrounds the first chamber.
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Abstract
A wafer level package of micro electromechanical system (MEMS) microphone includes a substrate, a number of dielectric layers stacked on the substrate, a MEMS diaphragm, a number of supporting rings and a protective layer. The MEMS diaphragm is disposed between two adjacent dielectric layers. A first chamber is between the MEMS diaphragm and the substrate. The supporting rings are disposed in some dielectric layers and stacked with each other. An inner diameter of the lower supporting ring is greater than that of the upper supporting ring. The protective layer is disposed on the upmost supporting ring and covers the MEMS diaphragm. A second chamber is between the MEMS diaphragm and the protective layer. The protective layer defines a number of first through holes for exposing the MEMS diaphragm. The wafer level package of MEMS microphone has an advantage of low cost.
154 Citations
18 Claims
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1. A wafer level package of micro electromechanical system (MEMS) microphone, comprising:
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a substrate; a plurality of dielectric layers stacked on the substrate; a MEMS diaphragm disposed between two adjacent dielectric layers of the dielectric layers, and a first chamber being formed between the MEMS diaphragm and the substrate; a plurality of supporting rings disposed in some of the dielectric layers respectively and stacked with each other, and the supporting rings surrounding the MEMS diaphragm; a protective layer disposed on the upmost supporting ring and above the MEMS diaphragm, a second chamber being formed between the MEMS diaphragm and the protective layer, and the protective layer defining a plurality of first through holes for exposing the MEMS diaphragm therefrom; and a guard ring, wherein the guard ring is located in some of the dielectric layers under the MEMS diaphragm and surrounds the first chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A manufacturing method for wafer level package of micro electromechanical system (MEMS) microphone, comprising:
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forming a plurality of dielectric layers on a substrate in sequence, forming a MEMS diaphragm between two adjacent dielectric layers of the dielectric layers and forming a plurality of supporting rings in some of the dielectric layers, wherein the supporting rings are stacked with each other, and the supporting rings surround the MEMS diaphragm; forming a protective layer on the upmost supporting ring and above the MEMS diaphragm, and the protective layer defining a plurality of first through holes; and forming a first chamber between the MEMS diaphragm and the substrate, and forming a second chamber between the MEMS diaphragm and the protective layer, wherein during forming the dielectric layers, a guard ring is formed in some of the dielectric layers, and the undermost supporting ring is located on the guard ring and coupled to the guard ring. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification