Patent ID: 8624385
Filing Date: 2014-01-07
Classification: B81B,B81C,H01L,H04R,Y10T

Abstract:
1. A solder reflow surface mount microelectromechanical system (MEMS) microphone device comprising: a substrate comprising multiple layers of non-conductive material, each layer having a predetermined coefficient of thermal expansion, and the substrate having a planar upper surface and a planar lower surface, the upper surface having an interior region and a peripheral region that completely surrounds the interior region, the substrate further comprising: a MEMS microphone die mounted to the upper surface of the substrate and electrically coupled to at least one of the first plurality of metal pads on the upper surface of the substrate, wherein the acoustic passage positions a diaphragm of the MEMS microphone die away from the upper surface of the substrate; and a single-piece cover having a predetermined shape that comprises a top region having a port that passes completely through the cover, and a substantially vertical sidewall region that adjoins the central region at a substantially perpendicular angle and that completely surrounds and supports the top region, the sidewall region having a predetermined height, an exterior sidewall surface, an interior sidewall surface, and a bottom surface, wherein the bottom surface of the sidewall region is aligned with and attached to the peripheral region of the upper surface of the substrate, and wherein the predetermined shape of the cover and the predetermined height of the sidewall region, in cooperation with the interior region of the upper surface of the substrate, forms a protective enclosure for the MEMS microphone die and defines an acoustic chamber for the MEMS microphone die.