| 摘要 |
PURPOSE:To remove unpleasant audible sound when a piezoelectric bendable vibrator is driven by applying an AC signal of harmonic range through a retainer terminal having an elasticity to the piezoelectric bendable vibrator. CONSTITUTION:When an AC signal of the range which is not heard by human ears is applied by a drive circuit, a piezoelectric bendable vibrator 13 fluctuates. A terminal 15 which has an elasticity is bent rightwardly as shown by an arrow due to the displacement by the fluctuation, and repelling force which tends to return the fluctuation to the original position is applied to the vibrator 13 as a force 20 at the next moment. This force 20 is operated obliquely upwardly, and the gravity G' of the vibrator 13 is accordingly displaced vertically. Rotary force 21 is produced by the displacement of the gravity g', and the vibrator 13 rotates. Accordingly, since the input to the vibrator is a signal of harmonic range, unpleasant audible sound is not generated when the vibrator is driven. |
