| 摘要 |
PURPOSE:To improve the characteristic such as a drift due to a temperature change by adhering a piezoelectric element to at least 3 side faces in a polygonal shape vibrator and forming the position of at least one end of one piezoelectric element and other piezoelectric element to be deviated when viewing from a lengthwise direction of the vibrator. CONSTITUTION:A vibrator 10 includes a polygonal shape made of a constant elastic metallic material such as a regular triangular shaped vibrator 12, and piezoelectric elements 14a-14c are adhered in the center of 3 side faces of the vibrator 12 respectively. Since the length of the piezoelectric element 14a in the lengthwise direction of the vibrator 12 is formed shorter than the length of the other two piezoelectric elements 14b, 14c, the vibrator 12 is bent in the vibrator 10 in a direction nearly orthogonal to a face with the piezoelectric element 14a adhered thereon due to temperature change. That is, distortion such as bent or twist caused due to the difference from the thermal expansion coefficient between the vibrator 12 and the piezoelectric elements 14a-14c is oriented in one direction and the distortion in other directions is relaxed. Thus, the characteristic such as a drift due to temperature change is improved. |
