Patent ID: 11902742
Assignee: HUAWEI TECHNOLOGIES CO., LTD.
Field: Measurement (Instruments)
Classification: CPC H  G | IPC G  H

Claim 0:
1. A microphone chip, wherein the microphone chip comprises:
a substrate and a diaphragm that are disposed oppositely;
a reflector located on a side of the diaphragm and that is close to the substrate;
a grating group located between the substrate and the diaphragm; and
an optical emitter and an optical detector that are located between the substrate and the grating group, wherein
the grating group comprises a plurality of gratings, and distances between at least two gratings in the plurality of gratings and the reflector are different, wherein a difference g between the distances between the at least two gratings in the plurality of gratings and the reflector satisfies:
(2n−1)×λ/8−λ/16≤g≤(2n−1)×λ/8+λ/16, wherein λ is a wavelength of light emitted by the optical emitter, and n is an integer greater than 0.