Patent ID: 7106878

Claim:
A speaker, comprising: a first magnet; a second magnet provided so as to surround the first magnet; a yoke for connecting the first magnet and the second magnet; a first voice coil; a second voice coil; a first diaphragm connected to the first voice coil; a second diaphragm oppositely provided to the first diaphragm with respect to the first magnet and connected to the second voice coil; a first magnetic plate provided between the first diaphragm and the first magnet; and a second magnetic plate provided between the second diaphragm and the second magnet, wherein: the first voice coil is provided in a first magnetic gap between the first magnetic plate and the yoke, and the second voice coil is provided in a second magnetic gap between the second magnetic plate and the yoke, and a magnetization direction of the first magnet is opposite to a magnetization direction of the second magnet.