| 摘要 |
PURPOSE: A dual vibration speaker and a speaker for a mobile device case are provided to a vibration plate of hard materials to one side of a bidirectional vibration structure. CONSTITUTION: A ring shaped permanent magnet(101) has a through-hole formed in the center. A plate(102) is attached to the front and back surface of the ring shaped permanent magnet. A cylindrical pole piece(103) is inserted into the through-hole of the permanent magnet and the plate. Tube shaped front and rear bobbins(104a,104b) are respectively inserted into either side of a gap between the pole piece and the plate. Front and rear dampers(105a,105b) are respectively combined with the front and rear bobbins. A voice coil(106) is rolled around the outer circumference of the front and rear bobbins. A magnetic circuit is composed of the permanent magnet, the plate, and the pole piece. |
