Patent ID: 8526665

Claim:
An electro-acoustic transducer, comprising: a substrate comprising a plurality of conducting paths; and a cover attached to said substrate thus forming an inner chamber and a space outside said chamber, wherein said cover comprises at least one port; and a MEMS sensor comprising a first side and second side and at least one hole extending from the first side to the second side and a membrane being arranged in said hole transverse to the hole axis thus forming a first hole space and a second hole space and having a plurality of electrical connectors adapted to carry electrical signals representing sound acting on said membrane, the connectors being connected to said conducting paths; and a mechanism for equalizing air pressure between said chamber and said outside space, said mechanism comprising at least on of a hole in the substrate, a hole in the cover, a hole in the MEMS sensor, a hole in the membrane, and a port formed by said cover and the substrate or the MEMS sensor, in particular by a break of a seal between said cover and the substrate or the MEMS sensor; wherein said first side of said MEMS sensor is attached to said substrate and said second side of said MEMS sensor is attached to said cover; and wherein said MEMS sensor is arranged inside said chamber in such a way that said second hole space is connected to said outside space via said at least one port and said first hole space is connected to said inner chamber via at least one gap formed between said first side and said substrate.