| 摘要 |
PROBLEM TO BE SOLVED: To resolve conventional problems by improving the form of an exciting coil and the support structure of a movable magnetic pole body, and to increase vibration acceleration by increasing the stroke of the movable magnetic pole body. SOLUTION: A first vibration system is composed of the movable magnetic pole body 4, a thin sounding board 1 disposed within a magnetic field of the movable magnetic pole body with its outer periphery supported on a resin-made base 3a, and the exciting coil 2 disposed in the sounding board. The magnetic pole body has a magnet 4a and a york 4b serving as a magnetic path of the magnet, and is supported on a housing with its top part faced to the inner diameter part of the exciting coil by a conical coil spring 6 contracting/expanding in the movable direction via the york. COPYRIGHT: (C)2004,JPO
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