JPS645374Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a piezoelectric resonator whose piezoelectric substrate is prevented from being damaged by external shocks.

Conventionally, piezoelectric resonators, as shown in Figure 1a,
A piezoelectric substrate 3 is sandwiched between a pair of metal terminal plates 1 and 2, and electrode films 4 formed on both main surfaces of the piezoelectric substrate 3,
With the protrusions 6 and 7 protruding from the centers of the metal terminal plates 1 and 2 being pressed into contact with the metal terminal plates 1 and 2, the entire body is housed in a case 8 and sealed with a sealing member 9.

By the way, when an external shock is applied to the piezoelectric resonator as described above, the piezoelectric substrate 3 tilts and collides with the metal terminal plate 1 or 2, as shown in FIG. , as shown in FIG. 1c, it sometimes cracked or was damaged.

The present invention was developed in view of the above-mentioned circumstances regarding conventional piezoelectric resonators.The present invention has been developed in view of the above-mentioned circumstances regarding conventional piezoelectric resonators. The object of the present invention is to provide a piezoelectric resonator that reduces stress generated in a substrate and improves impact resistance.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

An embodiment of the present invention is shown in FIG.

In FIG. 2, 1 and 2 are metal terminal plates made of elastic metal materials, 3 is a piezoelectric resonator, 8 is a case, and 9 is a sealing member.
Since both are the same as those in FIG. 1, they are shown with the same reference numerals and redundant explanation will be omitted.

In the embodiment shown in FIG. 2, each corner of the metal terminal plates 1 and 2 is bent toward the projecting side of the protrusions 6 and 7, as shown in FIG. Elastic shock absorbing portions 11 are formed around the terminal surfaces of the terminals 3 on the sandwiching side.
The piezoelectric substrate 3 has a gap g between it and the shock absorbing section 11 described above. In addition, the metal terminal plates 1 and 2
is between it and the inner wall surface of the case 8 that it faces,
It has a slight gap g'.

If this is done, a gap g will exist between the piezoelectric substrate 3 and the shock absorbing section 11, so the position of the vibration node of the piezoelectric substrate 3 needs to correspond to the shock absorbing section 11. Therefore, there is no restriction on the formation position of the shock absorbing portion 11. Furthermore, when an impact force of more than a certain level is applied from the outside to the casing 8 of the piezoelectric resonator, and the piezoelectric substrate 3 tilts and collides with the impact absorption part 11 of the metal terminal plates 1 and 2, the metal terminal plate 1 or 2
Since it has the above-mentioned gap g' between it and the case 8, it can bend toward the casing side. Also,
The shock absorbing portion 11 also bends due to its own elasticity. As a result, the impact force applied to the piezoelectric substrate 3 is freely absorbed by the impact absorption part 11,
It is possible to prevent damage such as cracks from occurring in the piezoelectric substrate 3.

Instead of bending the four corner portions of the metal terminal plates 1 and 2 at the dotted line positions to form the shock absorbing portions 11, . . . , 11 as in the embodiment shown in FIG. As shown in FIG. 4b, cuts 12, . The impact absorbing parts 11, . . . , 11 may be formed by bending the metal terminal plates 1 and 2 toward the protrusions 6 and 7, respectively, at the dotted line positions in FIG.

Even if the metal terminal plates 1 and 2 as described above are used, the same effect as the piezoelectric resonator shown in FIG. 2 can be obtained.

The present invention can be widely applied to piezoelectric resonators used as piezoelectric oscillators, piezoelectric filters, frequency-impedance converters, and the like.

According to the present invention, the impact force applied to the piezoelectric substrate is freely absorbed by the shock absorbing section provided around the metal terminal plate, so that when an external impact is applied to the piezoelectric resonator, the piezoelectric substrate hits the metal terminal plate. Even in the event of a collision, the impact applied to the piezoelectric substrate is reduced, the impact resistance of the piezoelectric resonator is greatly improved, and the reliability of the piezoelectric resonator is also greatly improved.

Furthermore, according to the present invention, since there is a gap between the piezoelectric substrate and the shock absorbing section, the position of the vibration node of the piezoelectric substrate does not need to correspond to the shock absorbing section, and the shock absorbing section It also has the advantage that there are no restrictions on the formation position.

[Brief explanation of drawings]

Figure 1a is a vertical cross-sectional view of a conventional piezoelectric resonator;
Figures b and 1c are longitudinal cross-sectional views showing the piezoelectric resonator of Figure 1a in a state where the piezoelectric substrate is damaged due to an impact, and Figure 2 is a longitudinal cross-sectional view of an embodiment of the piezoelectric resonator according to the present invention. 3 is a plan view of a metal terminal plate used in the piezoelectric resonator of FIG. 2, and FIGS. 4a and 4b are a plan view and a side view of a modified example of the metal terminal plate, respectively. be. 1, 2...metal terminal plate, 3...piezoelectric substrate, 4,
5... Electrode film, 6, 7... Protrusion, 8... Casing, 9... Sealing member, 11... Shock absorption part, 12
...Notch, g...gap.

Claims (1)

[Scope of utility model registration request] A protrusion is provided at the center of each of the pair of metal terminal plates, and a piezoelectric substrate is supported approximately parallel to the metal terminal plate between the protrusions at the periphery of each metal terminal plate. A bent part is provided with a predetermined gap to form an elastic shock absorbing part, and a pair of metal terminal plates is supported within the case with a slight gap between the bent part and the case. A piezoelectric resonator, characterized in that substantially the center of the piezoelectric substrate is sandwiched between a pair of protrusions, and the impact when the piezoelectric substrate is tilted is absorbed by the elasticity of the impact absorption part.