Patent ID: 11968497
Assignee: AAC ACOUSTIC TECHNOLOGIES (SHENZHEN) CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  B | IPC B  H

Claim 0:
1. A Micro-Electro-Mechanical System (MEMS) chip comprising:
a substrate with a back cavity;
a capacitance system disposed on the substrate, comprising:
a back plate;
a membrane in a circle shape opposite to the back plate forming an inner cavity;
a protruding portion accommodated in the inner cavity, fixed on one of the back plate and the membrane and spaced apart from the other along a vibration direction; and
a reinforce portion fixed to the membrane, having an area smaller than that of the membrane;

a support system configured to support the capacitance system, comprising:
a first fixation portion suspending the membrane on the substrate; and
a second fixation portion suspending the back plate on the substrate; wherein

the reinforce portion comprises a plurality of reinforce ribs in a strip shape; the reinforce rib extends along a radial direction of the membrane; the reinforce ribs are arranged as a ring around a center of the membrane;
the protruding portion comprises a first protrusion located in a central position and a second protrusion surrounding the first protrusion;
a projection of the first protrusion along the vibration direction located inside an area enclosed by an inner end of each reinforce rib;
a projection of the reinforce portion along the vibration direction is located inside the second protrusion.