| 摘要 |
PROBLEM TO BE SOLVED: To provide a speaker that is made small in size and weight-reduced and very easily and quickly assembled. SOLUTION: A torus shaped inner magnetic force generating section 2, a torus shaped outer magnetic force generating section 3 whose inner circumferential face is opposed to an outer circumferential face of the inner magnetic force generating section 2 at a prescribed interval and a connection section 4 connecting the inner magnetic force generating section 2 and the outer magnetic force generating section 3 that are used for magnet 1 are integrally molded using resin with very small magnetic materials blended thereto, the magnet 1 whose inner magnetic force generating section 2 and outer magnetic force generating section 3 are magnetized in the same directions orthogonal to both the outer circumferential face of the inner magnetic force generating section 2 and the inner circumferential face of the outer magnetic force generating section 3 is used, and a gap between the outer circumferential face of the inner magnetic force generating section 2 and the inner circumferential face of the outer magnetic force generating section 3 is used for a magnetic gap 7.
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