The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 20, 2022
Filed:
Aug. 20, 2021
Aac Acoustic Technologies (Shenzhen) Co., Ltd., Shenzhen, CN;
Yannick Pierre Kervran, HK, CN;
AAC Acoustic Technologies (Shenzhen) Co., Ltd., Shenzhen, CN;
Abstract
An optical microphone with a dual light source is provided. The optical microphone includes: a housing including an inner cavity and a sound inlet communicating the inner cavity with the outside; a MEMS module disposed in the inner cavity and including a flexible membrane and two gratings; two photoelectric modules, one being disposed in a front cavity and the other in a rear cavity, and each of the photoelectric modules including a light source and a light detector; and an ASIC module disposed in the rear cavity and electrically connected to the photoelectric modules. The optical microphone provides differential measurement, such that the output signal change on one of the two sides of the flexible membrane is positive and the output signal change on another side of the flexible membrane is negative. Therefore, a differential measurement structure is formed to improve the performance of the microphone.