Finnegan, Henderson, Farabow, Garrett & Dunner, L.L.P.
Directional microphone
A directional microphone includes a yoke, and a magnet and a washer disposed in the yoke. An annular cap body encloses a surrounding wall portion of the yoke, and has a plurality of first air passages extending from a front portion through a rear portion of the cap body and are angularly spaced apart from each other, and second air passages formed in the front portion and having radial first sections and axial second sections. A voice coil is disposed around the washer and the magnet within the yoke. A diaphragm is disposed adjacent to the front portion of the cap body and is connected to the voice coil. A protective cover has an annular surrounding wall coupled to the front portion of the cap body without covering the second air passages, and a perforated cover plate disposed proximate to the diaphragm. An air chamber unit is coupled to the rear portion of the cap body and is in communication with the first air passages. The rear portion of the cap body has an outer wall surface formed with a guide groove unit and a plurality of recesses for inter-communicating the second air passages and the guide groove unit.
H
H04R
inventional
Chao-Chih
Chang