| 摘要 |
PROBLEM TO BE SOLVED: To provide a multifunctional speaker wherein occurrence of positional deviation is prevented, adhering work of a magnet is facilitated, and exfoliation of an adhesive of the magnet can be prevented against exertion of a shock. SOLUTION: A shell type magnetic circuit section 3 is formed by using a pole piece 4 including a center pole 4a and a flange 4b, by fixing the annular magnet 5 to the flange 4b of the pole piece 4 at the center of the center pole 4a, and by fixing an annular top plate 6 to an upper face of the magnet 5, the magnetic circuit section 3 is elastically supported in a cover by an upper support spring 7 and a lower support spring 8, a diaphragm 9 with a voice coil 10 fixed thereto is fitted to the cover so as to attain the configuration wherein the voice coil 10 is located in a magnetic gap formed by the outer circumference of the center pole 4a and the inner circumference of the top plate 6, a magnet positioning projection 4c is provided to the flange 4b of the pole piece 4 in a way that a pair of projection inner walls 4d are opposed to each other on a line passing through the center of the pole piece 4 thereby positioning the magnet 5. Since the magnet 5 is joined with a face of the flange 4b and faces of the projection inner walls 4d, the contact area is increased to improve an adhesion fixing force. COPYRIGHT: (C)2005,JPO&NCIPI
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