Patent ID: 9301075
Filing Date: 2016-03-29
CPC Classification: H01L,H04R,Y10T

Claim Text:
1. An acoustic apparatus, the apparatus comprising: a substrate including a permanent opening extending there through; a micro electro mechanical system (MEMS) die disposed over the permanent opening, the MEMS die including a pierce-less diaphragm that is moved by sound energy; an integrated circuit being disposed on the substrate and being electrically coupled to the MEMS die; a first temporary opening that extends through the substrate the first temporary opening not being an electrical conduit but being suited only for outgassing and a second opening extending through the integrated circuit, the first temporary opening being generally aligned with the second opening; a cover that is coupled to the substrate and that encloses the MEMS die and the integrated circuit, such that the cover and the substrate form a back volume, and such that the diaphragm separates the back volume from a front volume; such that the first temporary opening and the second opening are unrestricted at a first point in time after assembly to allow gasses present in the back volume to exit through the first temporary opening and the second opening to the exterior, the pierce-less diaphragm preventing the gasses from passing there through; and such the first temporary opening is later substantially filled and closed at a second point in time after assembly and after outgassing has occurred, after which the acoustic device becomes operational.