| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic circuit for a speaker at a low cost that can reduce leakage magnetic flux and easily enhance the performance. SOLUTION: An annual magnetic body 12 made of a material with higher saturation magnetic density than that of a yoke 1 is placed on an inner bottom face 1a of the yoke 1 existing around the rising part of a pole piece 2 and the magnetic body 12 is in contact with an outer circumferential face of the pole piece 2. Since much of the magnetic flux directed to the outside in the radial direction from the rising part of the pole piece 2 passes through the magnetic body 12 with high saturation magnetic flux density, increase in the leakage magnetic flux when high energy is supplied to magnets 4, 5 can simply be suppressed at a low cost so as to easily increase the magnetic flux in magnetic gaps G1, G2.
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