Patent ID: 7724915

Claim:
A speaker device comprising: a housing having an opening portion; a vibration system member vibrating to generate sound; a support system member connected to said housing and for supporting said vibration system member in a manner which allows said vibration system member to vibrate; a first magnetic circuit disposed inside said housing and having a first magnet provided on a surface thereof facing the opening portion, and a first yoke provided lateral to the first magnet; and a second magnetic circuit having a second magnet disposed facing the first magnet of said first magnetic circuit via a first magnetic gap, and a second yoke provided lateral to the second magnet, wherein a second magnetic gap is formed in at least one of an interval between a side surface of the first magnet and the first yoke in said first magnetic circuit and an interval between a side surface of the second magnet and the second yoke in said second magnetic circuit, said vibration system member includes: a first voice coil; a first voice coil bobbin provided to dispose the first voice coil in the second magnetic gap; and a diaphragm including a magnetic member, the magnetic member being made of a magnetic material other than a magnet, being connected directly or indirectly to the first voice coil bobbin and being disposed in the first magnetic gap between the first magnet of said first magnetic circuit and the second magnet of said second magnetic circuit, wherein when said vibration system member is displaced to said first magnetic circuit from a balanced position, the magnetic member receives a pulling force in a direction which causes the magnetic member to travel away from the balanced position by the magnetic field formed by said first magnetic circuit and when said vibration system member is displaced to said second magnetic circuit from a balanced position, the magnetic member receives a pulling force in a direction which causes the magnetic member to travel away from the balanced position by the magnetic field formed by said second magnetic circuit.