VIBRATION DEVICE

摘要

Viewed planarly, a second piezoelectric vibrator (30) is positioned in a center portion (21) of a first piezoelectric vibrator (20). The inner surface of a frame-shaped support body (40) supports the edge of a vibrator member (10). Further, the fundamental resonance frequency of the first piezoelectric vibrator (20) is lower than the fundamental resonance frequency of the second piezoelectric vibrator (30). Further, when the first piezoelectric vibrator (20) is driven at the fundamental resonance frequency, the second piezoelectric vibrator (30) overlaps with the vibration loops generated in the vibration member (10). Ideally, the center of the second piezoelectric vibrator (30) overlaps with the center of the vibration loops generated in the vibration member (10) by means of the first piezoelectric vibrator (20).