| 摘要 |
A speaker is provided to improve a sound quality by having a first vibration plate and a second vibration plate which form an air layer and have a predetermined interval. A speaker includes a frame(110), a magnetic circuit unit(120), a vibration unit(130), and a weight ring(140). The frame has a coupling hole. The magnetic circuit unit includes a first magnet(123), a second magnet(125), a pole piece(127), and a plate(129). The yoke is coupled to the coupling hole. The first magnet is coupled to an upper plane of the yoke. The second magnet is coupled to an upper plane of the yoke to cover the first magnet. The pole piece is coupled to an upper plane of the first magnet and the second magnet. The magnetic circuit unit generates a magnetic force. The vibration unit has a first vibration plate(131), a second vibration plate(133), and a voice coil(135). An outer circumference plane of the first vibration plate is coupled to the frame. The second vibration plate is located on an upper part of the first vibration plate, and has an interval from the vibration plate. An outer circumference plane of the second vibration plate is coupled to the frame. The second vibration plate is located on an upper part between the pole piece and the plate. A lower part of the voice coil is located between the pole piece and the plate. An upper part of the voice coil is coupled to a connection part of the first vibration plate and the second vibration plate. The voice coil vibrates the first and second vibration plates if a power is supplied. The weight ring is coupled to a part of the first vibration plate coupled to the voice coil. |
