| 摘要 |
PROBLEM TO BE SOLVED: To realize a small-sized motional feedback speaker where a drive magnetic circuit and a detection magnetic circuit are provided and a vibration speed of a diaphragm can accurately be detected without affecting the magnetic circuits. SOLUTION: In the motional feedback speaker of velocity detection type provided with a drive magnetic circuit 10 to drive a diaphragm and a detection magnetic circuit 30 to detect a vibration speed of the diaphragm, the detection magnetic circuit is independent of the drive magnetic circuit in terms of the magnetic circuit, the detection magnetic circuit is integrated inside a magnetic circuit configuration of the drive magnetic circuit, and a detection coil wining core 34 is supported by support members 36, 37 inside a drive coil winding core 14 and at a plurality of positions apart in the vibration direction. Thus, the structure hardly causing magnetic interference is obtained.
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