| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic circuit for speakers that can achieve magnetic induction having efficient magnetic gap and at the same time can reduce the weight of a pole piece. SOLUTION: A main magnet (1) and a repulsion magnet (2) are mounted to the pole piece (3), thus generating magnetic flux by both the magnets. The shape of the pole piece is formed so that a site (3c) where an annular repulsion magnet is plated becomes thicker than other sites (3a). As a result, magnetic flux that is generated from the repulsion magnet passes through the thick section of the pole piece and can be easily guided to the direction of a magnetic gap (5), thus improving the induction efficiency in magnetic flux. Additionally, since the pole piece can be thinned partially, the weight of the pole piece can be reduced.
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