| 摘要 |
PROBLEM TO BE SOLVED: To suppress even distortion occurrence at the time of applying a big input to a low-distortion speaker. SOLUTION: The speaker comprises a frame 5, a magnetic circuit 1 supported by the frame 5, a voice coil body 2 arranged in a movable fashion in relation to a magnetic gap 8 provided at the magnetic circuit 1, and a vibration plate 3. An outer perimeter end of the vibration plate 3 is connected to the frame 5 through a first edge 4, and an inner perimeter end of the vibration plate 3 is connected to the voice coil body 2. The magnetic circuit 1 comprises a plate-like magnet 1a, a plate 1b provided at the vibration plate 3 side of the magnet 1a, and a yoke 1c provided at a side opposite to the plate 1b and extended towards a section facing the voice coil body 2 side end of the plate 1b for constituting a magnetic gap 8. A riser plane (a) at the magnet 1a side is formed on the voice coil body 2 side end of the plate 1a. In addition, a magnetic gap plane (b) projected to the yoke 1c side is formed at the vibration plane 3 side of the riser plane (a). COPYRIGHT: (C)2007,JPO&INPIT
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