Internal vent structure for waterproof microphone acoustic cavity

• Main Authors: John Kevin Arledge, Deborah A Gruenhagen, David J Meyer, Andrew P Miehl, Gary A Lee, Karl F Mueller
• Format: Patent
• Language: English
• Published: 05.12.2018
• Subjects: DEAF-AID SETS; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS; PUBLIC ADDRESS SYSTEMS

A printed circuit board assembly 409 for a sealed electronic device comprises a microphone mounted on the printed circuit board, a first acoustic input hole 417 formed through the printed circuit board adjacent to the microphone and an acoustically resistive air permeable venting structure 401 formed in the printed circuit board. The printed circuit board assembly may be configured to be enclosed in a sealed electronic device such that acoustic vibrations pass through a water resistant membrane of the sealed electronic device and through the first acoustic input hole to reach the microphone wherein the acoustically resistive air permeable venting structure is configured to vent an active acoustic cavity of the sealed electronic device to provide viscous acoustic damping. The acoustically resistive air permeable venting structure may include a plurality of pitched channels formed in the printed circuit board