| 摘要 |
PROBLEM TO BE SOLVED: To provide a dynamic electroacoustic transducer whereby a high sound pressure is attained, having maintained its small size. SOLUTION: A magnetic circuit unit 16 is constituted of a base 28 comprising a bottom wall part 28A extended in a horizontal direction at a lower part than a voice coil 14 and an annular wall part 28B, extended upward from the outer circumferential edge of the bottom wall part 28A; a magnet 30 placed and fixed on the upper surface of the bottom wall part 28A; and a yoke 32 placed and fixed on its upper surface 30b, and the annular wall part 28B of the base 28 and the outer circumferential face 32a of the yoke 32 are configured to form an annular magnetic gap G for accommodating the lower part of the voice coil 1. In this case, the magnet 30 is configured to be magnetized, directed from its lower surface 30a toward the upper surface 30b, in a direction tilting toward the magnetic gap G with respect to a vertical direction. Thus, leakage magnetic flux going upward from the yoke 32 is reduced, and effective magnetic flux toward the magnetic gap G is increased by that amount. COPYRIGHT: (C)2007,JPO&INPIT
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