Patent attributes
Leakage flux is reduced particularly in a magnetic gap of a magnetic circuit to improve the sensitivity of a dynamic microphone. A dynamic microphone including a magnetic circuit unit 20 including a center pole piece 22 connected to one pole of a first permanent magnet 21 and a yoke 23 which is connected to the other pole of the first permanent magnet 21 and is arranged like a ring around the center pole piece 22 via a magnetic gap of a predetermined width, a diaphragm 10 having voice coils 13 disposed in the magnetic gap, and a resonator 40 which has a front acoustic terminal 41 and is disposed at the front of the diaphragm 10, the dynamic microphone further including a second permanent magnet 43 disposed on a part of the resonator 40 so as to face the center pole piece 22, the second permanent magnet 43 being polarized in such a way that the same poles of the first permanent magnet 21 and the second permanent magnet 22 face each other.
