| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic circuit for speaker that is applicable to a speaker used for video and acoustic units, can supply sufficient magnetic flux to a magnetic gap in spite of its small-sized configuration and have a sufficient driving force. SOLUTION: The magnetic circuit B for a speaker is configured with a 1st magnet 3 and a 2nd magnet 4 respectively placed on a lower side of a 1st plate 1 and its upper side in a magnetically repulsing direction, a 3rd magnet 5 placed on a lower side of a 2nd plate 2 in a magnetically repulsing direction, and cylindrical yoke 6 forming 1st and 2nd magnetic gaps a1 and a2 with outer circumferential faces of the 1st plate 1 and the 2nd plate 2, and most of magnetic flux emitted from the 1st magnet 3, the 2nd magnet 3, and the 3rd magnet 5 is leaked to the 1st and 2nd magnetic gaps a1 and a2 so as to realize the small-sized magnetic circuit for the speaker with a high efficiency whose driving force is enhanced.
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