DYNAMIC MICROPHONE UNIT, METHOD OF MANUFACTURING MAGNETIC CIRCUIT UNIT FOR DYNAMIC MICROPHONE, AND DYNAMIC MICROPHONE

摘要

PROBLEM TO BE SOLVED: To provide a dynamic microphone unit in which an acoustic resistance body can be arranged adjacent to a back portion of a voice coil and a magnetic circuit component can be positioned precisely and stably, a method of manufacturing a magnetic circuit unit for a dynamic microphone, and a dynamic microphone.;SOLUTION: A dynamic microphone unit includes a magnetic circuit component including a permanent magnet 3 and forming a magnetic gap; a diaphragm 8 vibrating by receiving a sound wave; a voice coil 9 fixed to the diaphragm 8 and arranged in the magnetic gap; and an acoustic resistance body 20 filling a space behind the voice coil 9. The acoustic resistance body 20 has a relief hole 201 corresponding to the back portion of the voice coil. The magnetic circuit component may be integrated while the porous acoustic resistance body 20 is manufactured by pressing and sintering an acoustic resistance body material.;COPYRIGHT: (C)2013,JPO&INPIT