JPS5912808Y2 - piezoelectric vibrator - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a piezoelectric vibrator that is further miniaturized while ensuring the stability of the oscillation frequency by improving the support system.

Conventionally, in order to prevent vibration leakage to the outside, a bending vibrator needs to be supported with a support line having a length that is an integral multiple of λ/4 (λ is the wavelength), and the overall size of the vibrator There was a tendency for them to become larger.

Therefore, as shown in FIGS. 1 and 2, for example, the effective length of the support line 2 has been increased by curving the support line 2.

Moreover, above all in the vibrator shown in FIG.

Since the interposition of the support rod 3 hinders miniaturization, in recent years a method has been used in which the support rod is not used and the support wire is directly supported on the base. There are some things.

FIG. 3 shows this, but here the distance between the piezoelectric body 1 and the base 4 is shortened to achieve miniaturization.

In FIGS. 1 and 3, the piezoelectric body 1 has a so-called tuning fork shape, but a rod-shaped bending vibrator is also similar, for example, as shown in FIG. 2.

By the way, when the support wire 2 shown in FIG. 3 is integrally formed from a metal flat plate and assembled as a vibrator, it is a significant improvement over the support wire 2 shown in FIG. For accuracy, the width W1 on one side of this support system is the width W of the support line 2.
The width W3 of the main surface (the widest surface) of the piezoelectric body 1 is less than the width W2 of the support system in the direction perpendicular to the main surface, which limits the miniaturization of the entire vibrator. This inconvenience still remains.

Therefore, the present invention was developed with the aim of solving the above-mentioned disadvantages, and in a tuning fork-shaped bending piezoelectric vibrator,
By providing the support wire with an overhang extending in the main dimension direction of the piezoelectric body, vibration leakage can be prevented and the vibrator's
In addition to the dimension in the main dimension direction of the piezoelectric body, the dimension in the direction perpendicular thereto has also been successfully reduced.

Furthermore, by applying a similar configuration to the rod-shaped bending vibrator, that is, by providing the support wire of the vibrator with an overhang extending in the main dimension direction of the piezoelectric body, the piezoelectric body and the base can be connected. The distance between them can be further shortened.

Here, the main dimensions of the piezoelectric body are the largest dimensions.

In addition, the overhang is completely integrated with the original support line,
Some of them will be threatened.

4 and 5 each show a piezoelectric vibrator which is an embodiment of the present invention.

In FIG. 4, the support wire 2 is provided with a protrusion 5, whereas in FIG.
Both are basically the same except that the piezoelectric body 1 is supported by a protrusion 5 (which functionally corresponds to the protrusion 5).

In both countries, the distance 1 between the support point on the piezoelectric body 1 and the base 4
can be shortened to the limit that the bottom of the piezoelectric body 1 does not come into contact with the base 4, or even if it does, it can be shortened to the limit where it can come close to or touch the base 4 while deterioration of the series resonance resistance of the vibrator etc. due to it is acceptable. The role of leakage prevention is instead played by the overhanging portion 7 of the support line 2 that extends in the opposite direction to the base 4.

That is, when the vibration energy of the piezoelectric body 1 is lost from the support wire 2 to the base 4 through the protrusion 5, which is a so-called vibration leakage, the vibration energy propagates to the protrusion 7 having a predetermined length. This cancels out the reflected energy, effectively preventing vibration leakage.

This support line 2, including the overhanging part 7 (including the protruding part 5 in FIG. 4), is integrally formed from a flat metal plate using techniques such as etching, but compared to the one shown in FIG. Since the shape is simplified, processing accuracy can be improved.

As is clear from comparing FIGS. 4a and 5 with FIG. 3a, the dimensions of the entire vibrator in the main dimension direction of the piezoelectric body 1 are further shortened, and The overall dimensions of the vibrator in both directions can also be significantly reduced.

FIG. 6 shows an embodiment of the present invention for a rod-shaped bending vibrator. , the role of preventing vibration leakage is fulfilled, and the shape of the support wire is simplified compared to that shown in FIG. 2, and the piezoelectric body 1
The distance between the base and the base 4 can be shortened.

As described above, according to the present invention, it is possible to further reduce the size while preventing vibration leakage.

Moreover, since the shape of the support wire is simplified in this case, it also contributes to improvement in processing accuracy.

[Brief explanation of the drawing]

1, 2, and 3 all show conventional bending piezoelectric vibrators, and FIGS. 4, 5, and 6 each show a piezoelectric vibrator that is an embodiment of the present invention. It is. 1...Piezoelectric body, 2...Support wire, 7...
...Overhang section.

Claims (1)

[Scope of utility model registration request] In a bending piezoelectric vibrator, a support line planted in a base and standing in a row is integrated with the support line, extends in the main dimension direction of the piezoelectric body beyond the support point of the piezoelectric plate, and has an open end. A piezoelectric vibrator characterized by having an overhanging portion.