| 摘要 |
A speaker with a magnetic leakage prevention structure is provided to improve sound efficiency and realize clear sound by suppressing second and third-order harmonics generated from a magnetic circuit. A housing(3) has a diaphragm(4) on an open side surface. A cap(5) has a plurality of sound holes and protects the open side surface of the housing. A yoke(7) is installed at an inner center of the housing and has a bottom(7h) and a side wall(7v). Both ends of a leaf spring(6) are connected to an outer peripheral surface of the side wall of the yoke and an inner peripheral surface of the housing respectively to support the yoke and the housing elastically. A permanent magnet(9) is attached to an upper surface of the bottom of the yoke and forms a magnetic circuit by vertically polarizing N and S poles. One end of a voice coil(8) is fixed to the diaphragm, and the other end thereof is arranged between the side wall of the yoke and the permanent magnet. The yoke is curved from the bottom to the side wall of which an end cross section is curved to face a side surface of the permanent magnet. |
