JPS59193612A - Piezoelectric resonator and its manufacture - Google Patents

Abstract

PURPOSE:To improve the spurious characteristic and to attain mass-production by stacking square piezoelectric resonator elements in broadwise direction while tilting them so as to eliminate both end corners. CONSTITUTION:Square piezoelectric boards 6 are stacked in broadwise direction while being tilted, both ends of the stacked plates are cut off in a direction of the arrow and lots of resonators are formed at the same time. No spurious oscillation is produced as an oscillator and the spurious response as a filter is reduced through the construction above. Further, the piezoelectric resonator having a good spurious characteristic is subjected to mass-production by using the manufacture above.

Description

[Detailed description of the invention] The present invention relates to a piezoelectric resonator and a method for manufacturing the same.

In a piezoelectric resonator that uses an area vibration mode such as a spreading vibration mode, it is necessary to improve spurious characteristics mainly caused by thickness. Conventionally, as shown in FIGS. 1 and 2, a taber 2 is provided near one side of a square piezoelectric element 1, or a third
~ As shown in Figure 4, a step 4 was provided near one side of the square piezoelectric element 3, but this required grinding and cutting for each piezoelectric element, making it a structure suitable for mass production. It wasn't the method.

An object of the present invention is to provide a piezoelectric resonator with excellent spurious characteristics.

Another object of the present invention is to provide a method for mass-producing piezoelectric resonators with excellent spurious characteristics.

Embodiments of the present invention will be described below with reference to the drawings.

5-6 show an exemplary piezoceramic resonant element 5 in which the sides of the square piezoelectric plate are parallelograms, as shown particularly clearly in FIG.

The angle θ is related to the level of spurious response, and is set to an appropriate value.

The piezoelectric ceramic resonant element 5 having such a structure is manufactured as shown in FIG. That is, a plurality of square piezoelectric plates 6 (the side surfaces are rectangular as shown in FIG. 7) are prepared and stacked diagonally in the thickness direction.Then, both ends of the stacked body are cut in the direction of the arrow in the figure.Then, 5th ~
6. Many resonators 5 (not shown in FIG. 6) are completed at the same time.

Although the embodiment is a piezoelectric resonator in which the principal plane (the surface on which the electrodes are provided) is square, the present invention is also applicable to other piezoelectric resonators whose principal planes are parallelograms or rectangles, for example. .

With such a structure, when used as an oscillator, spurious oscillation will not occur, and when used as a filter, the spurious response in the thickness vibration mode will be reduced. Moreover, with this manufacturing method, piezoelectric resonators with good spurious characteristics can be obtained with good mass production.

[Brief explanation of drawings]

Fig. 1 is a plan view of a conventional example, Fig. 2 is a side view of a conventional example, Fig. 3 is a plan view of a conventional example, Fig. 4 is a side view of a conventional example, and Fig. 5 is a plan view of an embodiment of the present invention. 6 is a side view, and FIG. 7 is a side view. 5 is a piezoelectric ceramic resonant element, and 6 is a piezoelectric plate. Patent applicant: Tsukita Seisakusho Co., Ltd.

Claims (2)

[Claims] (1) A piezoelectric resonator whose side surfaces are parallelograms. (2) A piezoelectric resonator characterized in that the sides of the rectangular piezoelectric resonator are made into parallelograms by sequentially tilting a plurality of rectangular piezoelectric resonator elements and stacking them in the thickness direction and removing the corner portions at both ends. Production method.