| 摘要 |
PROBLEM TO BE SOLVED: To provide a speaker which vibrates two diaphragms by a single magnetic circuit part, with less leakage of magnetic flux, comprising efficient magnetic circuit part. SOLUTION: A speaker 1 comprises a magnetic circuit part 4 and a pair of vibrating parts 5a and 5b. The magnetic circuit part 4 comprises a magnet 6 and a pair of yokes 7a and 7b. One yoke 7a comprises a flat part 8 on which the magnet 6 is stacked and a rising post 9 raised from the center of the flat part 8. The other yoke 7b comprises the flat part 10 on which the magnet 6 is stacked and an outer edge rising wall 11 which is raised from the outer edge of the flat part 10. Between an outer peripheral surface 8a of the flat part 8 and the outer edge rising wall 11, one magnetic gap G1 is formed where a voice coil 12 of one vibrating part 5a is positioned. Between an inner peripheral surface 10a of the flat part 10 and the rising post 9, the other magnetic gap G2 is formed where a voice coil 12 of the other vibrating part 5b is positioned. COPYRIGHT: (C)2009,JPO&INPIT
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