| 摘要 |
PROBLEM TO BE SOLVED: To provide an excellent speaker capable of enhancing a sound pressure level thereof while achieving a low profile. SOLUTION: A yoke 23 of the speaker is made of at least two kinds of materials with different saturation magnetic flux densities or more, a part of the yoke 23 at which magnetic saturation easily takes place employs the material with high saturation magnetic density, and a part of the yoke 23 at which the magnetic saturation hardly takes place employs an ordinary material, then the magnetic flux of a magnet can effectively be utilized even when the yoke has a low profile and the enhancement of the sound pressure level of the speaker can be attained. COPYRIGHT: (C)2004,JPO&NCIPI
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