Patent ID: 9661420
Date: 2017-05-23
CPC Classifications: H04R

Claim:
1. An electromechanical transducer comprising: a magnetic circuit having a magnet configured to generate a magnetic field and an annularly shaped magnetic gap into which a voice coil associated with a diaphragm is at least partially inserted, the magnetic field having a primary flux component and a secondary flux component; and a housing positioned around the magnetic circuit, the housing having an acoustic spout that forms a sound outlet opening for outputting sound from the housing, and wherein the acoustic spout is positioned outside of a portion of the magnetic field that is dominated by the primary flux component such that a strength of the magnetic field at the acoustic spout is 10 mT to 30 mT less than a strength of the magnetic field over the magnet and the acoustic spout extends from an outer surface of the housing a distance sufficient to deflect a particle traveling in a direction that is off-axis with respect to an axis of the acoustic spout and toward the acoustic spout, away from the sound outlet opening.