光マイクロフォンアセンブリ

Japanese Patent JP7387645

B2

An optical microphone assembly comprises a rigid substrate; an interferometric arrangement, a light source, at least one photo detector and an enclosure. The interferometric arrangement comprises a membrane and at least one optical element spaced from the membrane, wherein the at least one optical element comprises a surface of the substrate and/or is disposed on a surface of the substrate. The light source is arranged to provide light to the interferometric arrangement such that a first portion of the light propagates along a first optical path via the interferometric arrangement and a second portion of the light propagates along a second different optical path via the interferometric arrangement, thereby giving rise to an optical path difference between the first and second optical paths which depends on a distance between the membrane and the optical element. The photo detector(s) are arranged to detect at least part of an interference pattern generated by said first and second portions of light dependent on said optical path difference. The enclosure is arranged to form an acoustic cavity in fluid communication with one side of the membrane. The volume of the acoustic cavity is at least 3 mm multiplied by d2, where d is a diameter of the membrane.

Anderskol, Halvar
Bakke, Thor
Johansen, Eve-Run
Lacole, Mathieu
Bena Rod, Jacob
Vogl, Andreas
Wang, Doug

JP2020564489A

November 28, 2023

May 15, 2019

Click for automatic bibliography generation  

Syntef Tio Actiesel Turnip

H04R23/00

JP2016529480A

US20160219375
US20110194711

Ariko Patent Office

Previous Patent: Processing apparatus and method with level control of gas separation devices

Next Patent: System for displaying optical images