| 摘要 |
PURPOSE:To obtain a bend vibration type ceramic vibrator whose capacity ratio is small by joining a sheet material consisting of a constant elastic metallic material to both surfaces of a pizoelectric porcelain plate polarized in the longitudinal direction. CONSTITUTION:A longitudinal effect utilizing piezoelectric porcelain plate 11 is polarized in the lengthwise direction as shown in a polarized direction 12, and electrodes 13, 13' are provided on the center part in the lengthwise direction of both surfaces in this thickness direction. These electrodes 13, 13' are formed by a constant elastic metallic material, and joined by a conductive adhesive. When a ceramic vibrator is formed in this way, and an AC electric field is impressed between the electrodes 13, 13', a vibration is generated by a vibration mode having a large electric machine coupling coefficient, therefore, the capacity ratio becomes small. In this way, a bend vibration type ceramic vibrator whose capacity ratio is small is obtained. |
