| 摘要 |
A magnetic circuit of the present invention uses a yoke, wherein a thickness of a bottom portion 10b of the yoke 10 is thicker than a thickness of an outer cylindrical portion 10a. The magnetic circuit of the present invention comprises the yoke, a magnet 2 bonded to the bottom portion of the yoke, and a top plate 3 bonded to the magnet, a magnetic gap being formed between the top plate and the outer cylindrical portion. According to a configuration of the present invention, it is possible to reduce the magnetic saturation in the bottom portion of the yoke and to improve the efficiency of the magnetic circuit. As a result, the configuration contributes to improve the performance and efficiency of a loudspeaker using the magnetic circuit of the present invention.
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