Patent ID: 8983105
Filing Date: 2015-03-17
Classification: B81B,H01L,H04R

Abstract:
1. A microphone comprising: a housing formed by a cap sealed to a substrate; a MEMS die mounted on the substrate, the MEMS die incorporating a membrane, the membrane having a first surface facing the substrate and in fluid communication with an acoustic inlet port in the cap via an acoustic path, and a second surface facing the inner surface of the cap, which second surface along with part of the inner surface of the cap defines at least part of a sealed chamber within which a volume of air is trapped; and an insert comprising an upright nozzle, the insert provided within the sealed chamber and the upright nozzle being surrounded by the sealed chamber volume; wherein the acoustic path is defined at least in part by the upright nozzle terminating at the acoustic inlet port at a first end and at a channel at the second end, the channel leading to a second chamber beneath the first surface of the membrane.