US Patent 10231061 Sound transducer with housing and MEMS structure

A sound transducer includes a housing with a sound port and a MEMS structure disposed in an interior space of the housing. The MEMS structure and the sound port are acoustically coupled to each other. The MEMS structure separates a front volume from a back volume of the housing. At least one vent hole of the MEMS structure allows a gas exchange between the front volume and the back volume. The sound port allows a liquid to enter the front volume. Further, the MEMS structure prevents liquid from entering the back volume.