| 摘要 |
PROBLEM TO BE SOLVED: To provide a planar vibrator which uses a high magnetostriction material, is capable of miniaturization and simplification, and is suitable for a speaker or an ultrasonic-wave generating source. SOLUTION: The planar vibrator includes a planar magnetostriction member 2, a bias magnetic-field generating magnet 4 and a coil 6 respectively arranged at different positions in planar directions L of the magnetostriction member, and a yoke 8 arranged in a direction T perpendicular to the planar directions of the magnetostriction member from the periphery of the magnetostriction member and extending at least up to the height same as that of the bias magnetic-field generating magnet. The planar vibrator functions as a vibrator by making the magnetostriction member be expanded and contracted in the planar directions by a signal supplied to the coil 6. COPYRIGHT: (C)2009,JPO&INPIT
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