PURPOSE: To improve the mass-productivity by providing a notch in a way of being overlapped onto a main electrode face at least one of end faces orthogonal to the main electrode face thereby relaxing the processing accuracy of a center slot.
CONSTITUTION: A slot 3 is provided on a piezoelectric resonance component 1 along one major surface of a piezoelectric ceramic substrate 2 in the lengthwise direction (l) and the slot 3 bisects one major surface in the direction of (l). Moreover, slots 4, 5 are provided on a position of 1/3l from the center in the direction of length (l) toward a direction in crossing with the length (l). On the other hand, an input electrode 6, an output electrode 7, independent electrodes 8∼11 are provided on the major surface while being sectioned by slots 3∼5 and an entire facial electrode 12 is provided on the other major surface. Then the depth (d) of the slot 3 is selected to be 30∼70% of the thickness (t) of the piezoelectric substrate 2. Thus, undesired vibration is suppressed and the frequency of the undesired vibration is shifted toward high frequencies in addition.
TAKAHASHI TORU
SUGIMOTO MASANOBU
