Microphone unit

摘要

A microphone unit includes a case; a diaphragm arranged inside the case; and an electric circuit unit that processes an electric signal generated in accordance with vibration of the diaphragm. The case has a first sound introducing space that introduces a sound from outside of the case to a first surface of the diaphragm via a first sound hole; and a second sound introducing space that introduces a sound from outside of the case to a second diaphragm, via a second sound hole. A resonance frequency of the diaphragm is set in the range of ±4 kHz based on the resonance frequency of at least one of the first sound introducing space and the second sound introducing space.

主权项

1. A microphone unit, comprising:
a case; and a diaphragm arranged inside the case; wherein: the case includes a first sound introducing space that introduces a sound from outside of the case to a first surface of the diaphragm via a first sound hole and a second sound introducing space that introduces a sound from outside of the case to a second surface of the diaphragm, which is an opposite surface of the first surface of the diaphragm, via a second sound hole; wherein the first and second sound holes are formed in the same surface; and a distance between the centers of the first and second sound holes is not less than 4 mm and not more than 6 mm; and a resonance frequency fd of the diaphragm fulfills formula below:
7000