Patent ID: 7369674
Filing Date: 2008-05-06
Classification: H04R

Abstract:
1. An acoustic apparatus, comprising: a yoke including a central portion and a flange; a main speaker mechanism having functions as a receiver and disposed on a first surface of the yoke; a sub speaker mechanism having functions as a receiver and disposed on a second surface of the yoke opposite to the first surface and adjacent to the main speaker mechanism; and a frame disposed to surround the yoke and an outer periphery of the flange of the yoke being connected to a sub-frame positioned inside the frame, the main speaker mechanism including a first magnet disposed on the first surface of the yoke at the central portion thereof, a first top plate disposed on the first magnet, an annular vibration-transmitting panel connected to the sub-frame through a first suspension, and a first annular voice coil attached to a lower surface of the annular vibration-transmitting panel and inserted in a first magnetic gap formed between the yoke and the first magnet, the sub speaker mechanism including a second magnet which has an annular shape and is disposed on the second surface of the yoke at the flange thereof, a second top plate disposed on the second magnet, a vibrating plate which is attached at a circumferential portion thereof to the frame and provided over the second magnet and the second top plate, and a second voice coil attached to the vibration plate and inserted in a second magnetic gap formed between the yoke and the second magnet.