| 摘要 |
PURPOSE:To eliminate a deteriorated frequency characteristic for resonance of diaphragm due to in-yoke stiffness, to improve the sensitivity and to simplify the manufacture. CONSTITUTION:Apertures 17b, 19a are provided to a yoke 17 and a cavity 19 and a space at a gap between the yoke and the magnet is linked to an outer side of a microphone unit and a resistor 21 of nearly sheet form provides a proper resistance to the apertures 17b, 19a. Moreover, a compressed foaming member 20 is used as a resistor at the outside of the aperture 17a. Moreover, a diaphragm 14 and a voice coil 15 are mounted onto an equalizer 12 and it is mounted to a position at which the yoke 17 and the magnet 16 are provided. |
