Microphone port with foreign material ingress protection

摘要

An electronic device may be provided with a microphone in a microphone port. A shield may cover a microelectromechanical systems microphone device on a microphone substrate. An opening in the microphone substrate may form a sound port for the microphone. The microphone port may be formed by perforations in the microphone substrate or other layers such as a flexible printed circuit layer, a sheet metal layer, a layer of adhesive, a flexible polymer carrier layer in an adhesive tape, or an electronic device housing. The perforations may be sufficiently small to help resist the intrusions of foreign material such as liquid and dirt into the sound port of the microphone. Larger openings may be formed in other structures such as an electronic device housing. The larger openings may serve as sound passageways for the microphone port while being sufficiently large to resist clogging.

主权项

1. Apparatus, comprising:
an electronic device housing having opposing inner and outer surfaces; a first plurality of openings each of which passes part way from the inner surface into the electronic device housing; a second plurality of openings each of which has a larger diameter than the openings of the first plurality of openings and each of which passes part way from the outer surface into the electronic device housing, wherein the second plurality of openings joins with the first plurality of openings to form microphone port sound passageways through the electronic device housing; and a microphone having a sound port in alignment with the first plurality of openings that receives sound through the microphone port sound passageways, wherein the first plurality of openings is interposed between the second plurality of openings and the sound port.