JPS593885B2 - piezoelectric vibrator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric vibrator, and particularly to a piezoelectric vibrator in which a piezoelectric element is fixed to a support via a support wire of the support.

In a piezoelectric vibrator, the piezoelectric element is fixed to the support body by fixing the wire fixed to the excitation electrode part of the piezoelectric element to the support wire of the support body consisting of a support line and a support base. For example, if the type vibrator is a bending piezoelectric vibrator, the number of excitation electrodes, that is, the number of electrically independent wires, must be four or more, and therefore the number of support wires that firmly support these wires must also be the same number. becomes.

On the other hand, in order to securely hold the support wire on the support base and increase vibration resistance and impact resistance, it is preferable to hold the support wire firmly on the support base at at least two places instead of just one. The body structure becomes large, making it difficult to miniaturize the piezoelectric vibrator.

Therefore, an object of the present invention is to provide a piezoelectric vibrator that is small in size and has excellent vibration resistance and impact resistance.

In the piezoelectric vibrator of the present invention, the support wire has a special structure in order to obtain the piezoelectric vibrator as described above.

That is, in the piezoelectric vibrator of the present invention, the above-mentioned method is used to fix a support consisting of a piezoelectric element having a plurality of wires fixed thereto, a support base, and support wires fixedly held at at least two places on the support base. In the piezoelectric vibrator configured such that a plurality of wires are fixedly supported by the support wires, the portions of the support wires that fixedly support the plurality of wires are all made of metal, and these metal portions At least a portion of the middle portion of the material is made of an insulating material.

Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 shows a conventional type of bending piezoelectric vibrator shown to clarify the features of the present invention, in which a is a perspective view thereof and b is a sectional view taken along line A.

Excitation electrodes 2 are formed on the bidirectional surfaces of the piezoelectric vibrating element 1 by a method such as vapor deposition or plating to form a rice-shaped element.

A wire 3 is fixed to this excitation electrode 2 with a conductive binder (not shown), and this wire 3 is fixedly supported by a support wire 5 whose both ends are fixedly held on a support base 4.

With this structure, there is no problem with earthquake resistance and impact resistance, but as is clear from the figure, the support base 4
and support line 5, that is, the structure of the support body becomes larger,
Therefore, it is inevitable that the piezoelectric vibrator as a whole becomes large.

Fig. 2 shows a bent electric vibrator in which the support wire 5 is fixedly held to the support body 4 at only one place, where a is a front view and b is a cross section taken along line B. It's raining pictures.

With this structure, the support wire 5 and the support base 4, that is, the structure of the support body itself, can be small, but since the support wire 5 is fixed and held in a so-called cantilever beam, as mentioned at the beginning, it is earthquake resistant. and poor impact resistance.

FIG. 3 shows an example of the present invention using a bending piezoelectric vibrator, in which a is a front view and b is a sectional view taken along line C.

Excitation electrodes 2 are provided on both sides of the piezoelectric vibrating plate 1, and wires 3 are fixed to each of the excitation electrodes 2.
It is firmly supported by the support line 5 of the book.

This support line is connected to the support stand 4 at two metal parts near both ends.
However, unlike the conventional case, the central part thereof is made of an insulating material 6, such as glass.

Therefore, although the support wire 5 is mechanically one wire, it can electrically serve as two support wires.

Therefore, although the piezoelectric vibrator shown in Fig. 3 has vibration resistance and impact resistance equivalent to or better than the conventional one shown in Fig. 1, its overall thickness is comparable to that of the conventional one. This has the advantage that it can be the same as the small-sized one shown in FIG.

According to an actual example, the amount of frequency change due to vibration or impact is about half L or less compared to that of the vibrator shown in Figure 2.
When compared in terms of volume, it is approximately one-half or less compared to the vibrator shown in FIG.

FIG. 4 shows another actual case of the present invention, in which a is a front view and b is a sectional view along the line.

What is different from the one in FIG. 3 is the structure of the support base, in which the stem 7 and its lead wire 8 are combined to form the support base 4 in FIG.
It has a support structure that is used as a Buddhist monk.

A structure in which such a stem 7 is covered with a case (not shown) is suitable for practical use.

FIG. 5 is a plan view showing still another actual case of the present invention.

This actual case aims to increase the frequency of the long-side piezoelectric vibrator (three times the fundamental wave), and the support structure that combines the stem 7 and lead wire 8 is of the same type as the one in FIG.

The support wire 5 is composed of three metal parts that firmly support the wire 3 and two insulating material parts 6 between them,
The three metal parts are fixedly held on the lead wire 8 at portions near both ends of the support wire and at a portion near the center.

Therefore, this piezoelectric vibrator is small and has high vibration and shock resistance, and it is easy to increase the frequency of the piezoelectric vibrator.
It has many practical advantages.

As described above, according to the present invention, a piezoelectric vibrator which is small in size and has excellent earthquake and shock resistance can be obtained.

[Brief explanation of the drawing]

1A is a perspective view of a conventional bending piezoelectric vibrator, b is a cross-sectional view thereof, and FIG. 2A is a front view of another conventional bending piezoelectric vibrator, b is a cross-sectional view thereof, 3a is a front view of an embodiment of the present invention using a bending piezoelectric vibrator, b is a sectional view thereof, and FIG. 4a is a front view of another example of the present invention, b 5 shows a cross-sectional view thereof, and FIG. 5 shows a plan view of still another actual case of the present invention using a long-side piezoelectric vibrator. Explanation of symbols: 1 is a piezoelectric vibrating element, 2 is an excitation electrode, 3 is a wire, 4 is a support base, 5 is a support wire, 6 is an insulating material, 7 is a stem, and 8 is a lead wire.

Claims (1)

[Claims] 1. A support body consisting of a piezoelectric element to which a plurality of wires are fixed, a support base, and support wires that are fixedly held at at least two places on the support base, and fixed by firmly supporting the plurality of wires with the support wires. A piezoelectric vibrator comprising a piezoelectric vibrator, characterized in that each of the portions of the support wire that firmly supports the plurality of wires is made of metal, and at least a part of the middle of the portions is made of an insulating material. Child.