Patent attributes
An acoustic apparatus comprising a yoke, a main speaker mechanism disposed on a first surface of the yoke, and a sub speaker mechanism disposed on a second surface of the yoke opposite to the first surface and adjacent to the main speaker mechanism, the main speaker mechanism including a first magnet disposed on the first surface of the yoke, a first top plate disposed on the first magnet, a vibration-transmitting panel attached to the yoke and contactable with a vibrating member in a communication device, and a first voice coil attached to the 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 disposed on the second surface of the yoke, a second top plate disposed on the second magnet, a vibrating plate attached to a frame disposed to surround the yoke and a second voice coil attached to the vibrating plate and inserted in a second magnetic gap formed between the yoke and the second magnet.
