Patent ID: 11950053
Assignee: AAC ACOUSTIC TECHNOLOGIES (SHENZHEN) CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  B | IPC B  H

Claim 0:
1. A MEMS chip comprising:
a substrate with a back cavity;
a capacitance system disposed on the substrate, comprising:
a back plate;
a membrane opposite to the back plate forming an inner cavity; and
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;

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 protruding portion comprises an annular first protruding portion and an annular second protruding portion surrounding the first protruding portion; wherein

the back plate is located on one side of the membrane away from the back cavity; the first fixation portion is in an annular shape; the second fixation portion is located inside the first fixation portion and spaced apart from the first fixation portion.