Speaker apparatus
A speaker apparatus includes a speaker frame, an acoustic vibrating plate movably supported on the speaker frame, and a magnetic driver formed in the speaker frame for vibrating the acoustic vibrating plate. The magnetic driver is connected such that it may vibrate different portions of the acoustic vibrating plate independently. The acoustic vibrating plate of the speaker apparatus may vibrate with the same phase, thereby increasing sound pressure and improving acoustic efficiency.
1. A speaker apparatus, comprising:
a speaker frame;
an acoustic vibrating plate movably supported to the speaker frame;
a magnetic driver connected to the speaker frame adapted to vibrate the acoustic vibrating plate, wherein the magnetic driver independently vibrates different portions of the acoustic vibrating plate; and
a gasket connected to the speaker frame and to the acoustic vibrating plate to prevent separation of the acoustic vibrating plate from the speaker frame by vibration of the acoustic vibrating plate, the gasket being formed separately from the acoustic vibrating plate,
wherein the magnetic driver includes
a first magnetic circuit adapted to vibrate a central portion of the acoustic vibrating plate; and
a second magnetic circuit adapted to vibrate a specific portion between the central portion and a peripheral portion of the acoustic vibrating plate,
wherein the first magnetic circuit includes
a first magnet formed corresponding to the center of the acoustic vibrating plate;
a second magnet wound around the first magnet with a predetermined gap therebetween; and
a first coil unit connected to the acoustic vibrating plate disposed between the first and second magnets and adapted to be moved by an interaction with the first and second magnets when current is applied thereto,
wherein the first coil unit includes
a first bobbin connected to the acoustic vibrating plate; and
a first coil wound around the first bobbin to which current is applied,
wherein the second magnetic circuit includes
a third magnet formed at a specific portion between the central and the peripheral portions of the acoustic vibrating plate and wound around the second magnet;
a fourth magnet wound around the third magnet with a predetermined gap therebetween; and
a second coil unit connected to the acoustic vibrating plate and disposed between the third and fourth magnets, and adapted to be moved by an interaction with the third and fourth magnets when current is applied thereto,
wherein the second coil unit includes
a second bobbin connected to the acoustic vibrating plate; and
a second coil wound around the second bobbin and to which current is applied,
wherein a first damper supports the first bobbin on the speaker frame and maintains the balance of the first bobbin, the first damper being disposed between the first and second bobbins, and
wherein a second damper supports the second bobbin on the speaker frame and maintains the balance of the second bobbin, the second damper being disposed between the second bobbin and the speaker frame.
2. The speaker apparatus as claimed in claim 1 , wherein
the second and third magnets are the same magnet.
3. The speaker apparatus as claimed in claim 1 , wherein
a bottom metal plate is connected to the first and fourth magnets and to the speaker frame; and
a top metal plate is disposed opposite to the bottom metal plate across the second and third magnets.
4. The speaker apparatus as claimed in claim 1 , wherein
the second magnet is substantially ring-shaped.
5. The speaker apparatus as claimed in claim 4 , wherein
the second magnet is substantially concentric with respect to the first magnet.
6. The speaker apparatus as claimed in claim 1 , wherein
the fourth magnet is substantially concentric with respect to the third magnet.
7. The speaker apparatus as claimed in claim 1 , wherein
the third magnet is substantially ring-shaped.