Dynamic microphone unit and dynamic microphone

摘要

A dynamic microphone unit includes: a diaphragm that vibrates in response to received sound waves; a voice coil that is fixed to the diaphragm and vibrates together with the diaphragm; a magnetic circuit that generates a magnetic field in a magnetic gap, the voice coil being disposed in the magnetic gap; a resonator that is disposed adjacent to the obverse of the diaphragm; and a noise canceling coil that is fixed to a surface of the resonator so as to face a position of fixing the voice coil, the surface facing the diaphragm. The noise canceling coil is connected in series with the voice coil and has a winding direction different from that of the voice coil.

主权项

1. A dynamic microphone unit comprising:
a diaphragm that vibrates in response to received sound waves; a voice coil that is fixed to the diaphragm and vibrates together with the diaphragm; a magnetic circuit that generates a magnetic field in a magnetic gap, the voice coil being disposed in the magnetic gap; a resonator that is disposed adjacent to the obverse of the diaphragm; and a noise canceling coil fixed to a surface of the resonator, the surface facing the diaphragm, the noise cancelling coil facing the voice coil, wherein the resonator has a convex surface positioned on the surface facing the diaphragm, wherein the convex surface is being formed by a flattened cylindrical surface along a circle concentric with the voice coil, and wherein an inner circumferential surface of the noise canceling coil is fit along the convex surface to align and fix the noise canceling coil to the convex surface of the resonator.