JPH09246900A - Piezoelectric vibrator holding structure - Google Patents

Abstract

(57) [Abstract] [Problem] There is little influence on the characteristics of the piezoelectric vibrator,
Provided is a piezoelectric vibrator holding structure for realizing stable holding. In a holding structure for a piezoelectric vibrator using a piezoelectric material, the piezoelectric vibrator 4 is held by a holder 8 via a sintered body 6 having fine irregularities on its surface.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a piezoelectric ceramic,
The present invention relates to a piezoelectric vibrator holding structure using a piezoelectric material such as quartz or niobium lithium oxide.

[0002]

2. Description of the Related Art A conventional structure of a piezoelectric vibrator holding structure using a piezoelectric material such as piezoelectric ceramic, crystal, niobium lithium oxide, etc. will be described below.

Piezoelectric vibrators used for mechanical filters, oscillators, etc. are made of materials such as piezoelectric ceramics, crystal, and niobium lithium oxide. Depending on the frequency range used,
The appropriate vibration mode is excited by the piezoelectric effect. These piezoelectric vibrators have a vibration amplitude of 0 so as not to suppress vibration.
It is held in the vicinity of the node that becomes (zero), and is configured as a filter or oscillator. Since the node having the vibration amplitude of 0 (zero) is a point or line having no area, ideally it is desirable to hold the piezoelectric vibrator at a point or line of area 0 (zero). However, in practice, it is difficult to hold the piezoelectric vibrator with a point or line having an area of 0 (zero), so in order to realize stable holding of the piezoelectric vibrator, a certain finite area is given to form a dot shape. Or it is held in a line.

FIG. 6 is a perspective view of a conventional rectangular plate type piezoelectric vibrator 1 made of a piezoelectric material such as a piezoelectric ceramic. Electrodes are provided on the main surfaces of the rectangular plate type piezoelectric vibrator 1 which face each other. 2 is provided, and the spreading vibration of the rectangular plate is excited by applying an electric field between the electrodes. The node of this vibration mode is a point at the center of the rectangular plate type piezoelectric vibrator 1. In this conventional technique, as shown in FIG. The piezoelectric vibrator 1 is held from both sides by a holder 3 having a circular flat end and having a spring property.

FIG. 7 is a perspective view of another conventional rectangular plate type piezoelectric vibrator 4 made of a piezoelectric material, in which the length vibration of the rectangular plate is excited. In length vibration, the vibration node is linear in the center of the rectangle.
As shown in FIG. 5, the piezoelectric vibrator 4 is held in the vicinity of a node by a holder 5 having a certain width and having a linear spring property.

In these conventional holding structures, holding becomes unstable when the holding area is small, and conversely, when the holding area is large, the vibrating portion is pressed down, so vibration is suppressed. As a result, the characteristics of the vibrator deteriorate.

[0007]

In the conventional piezoelectric vibrator holding structure, the piezoelectric vibrator is directly held by a holding tool in a dot shape or a linear shape having a certain area. Therefore, if the holding area is reduced to prevent deterioration of the characteristics of the piezoelectric vibrator, holding becomes unstable, and if a drop etc. occurs, the posture of the vibrator changes due to the impact and the characteristics of the vibrator also change. I will end up. In addition, if the area of the holding portion is increased to obtain a stable holding structure, the vibrating portion is suppressed, and the vibration of the vibrator is suppressed,
The oscillator characteristics deteriorate.

The present invention has been made to solve the above problems, and is a piezoelectric vibrator for realizing stable and highly reliable holding with little influence on the vibrator characteristics of the piezoelectric vibrator. It is intended to provide a holding structure for the.

[0009]

In order to achieve the above object, a holding structure for a piezoelectric vibrator according to the present invention is characterized in that the piezoelectric vibrator is held by a holder via a sintered body having fine irregularities on its surface. It is characterized by being held.

By doing so, the sintered body and the holder are partially in contact with each other. Therefore, in order to stabilize the holding, the contact portion between the piezoelectric vibrator (actually the sintered body) and the holder is enlarged. However, the effective contact area can be suppressed. Therefore, the suppression of the vibration of the piezoelectric vibrator can be reduced, and the vibration leaking through the holder can be reduced, so that the deterioration of the characteristics of the piezoelectric vibrator due to the holding can be extremely reduced.

The sintered body is preferably made of metal or ceramic, and the holder preferably has a spring property. Further, it is preferable to hold the vicinity of the vibration node of the piezoelectric vibrator. By holding the vicinity of the vibration node, it is possible to reduce the influence on the vibration characteristics of the piezoelectric vibrator.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a holding structure for a piezoelectric vibrator according to a first embodiment of the present invention. In FIG. 1, a rectangular plate-shaped piezoelectric vibrator 4 made of a piezoelectric material such as piezoelectric ceramics, crystal, or niobium lithium oxide is provided with electrodes 2 on its facing surface. Then, by applying an AC electric field to the electrode 2, a length vibration mode having a main displacement in the length direction of the piezoelectric vibrator 4 is excited. The node of this length vibration is linear in the central part of the rectangular plate, and a sintered body 6 of nickel, chromium, aluminum or the like having fine irregularities is bonded to the vicinity of this node line via an adhesive layer 7.

FIG. 2 shows a holding structure for the piezoelectric vibrator 4 shown in FIG. The piezoelectric vibrator 4 is held so as to be sandwiched by a holder 8 having a spring property via a sintered body 6 bonded to the piezoelectric vibrator 4 with an adhesive layer 7.

FIG. 3 is a perspective view showing a piezoelectric vibrator holding structure according to a second embodiment of the present invention. In FIG. 3, a disk-shaped piezoelectric vibrator 9 is provided with electrodes 10 on its opposing surfaces. Then, by applying an AC electric field to the electrode 10, it is possible to excite the radial spreading vibration mode having the main displacement in the radial direction of the vibrator 9. The node of this vibration is a point at the center of the disk, and in the vicinity of this node,
A disc-shaped sintered body 11 having fine irregularities is bonded via an adhesive layer 12.

FIG. 4 shows a holding structure for the piezoelectric vibrator 9 shown in FIG. The piezoelectric vibrator 9 has an adhesive layer 12 on the piezoelectric vibrator 9.
It is held so as to be sandwiched by a holder 13 having a spring property via the sintered body 11 adhered by.

FIG. 5 is an enlarged view of the holding portion of the holding structure for the piezoelectric vibrators 4 and 9 in each of the embodiments described above. The piezoelectric vibrators 4 and 9 and the sintered bodies 6 and 11 are bonded to each other by the adhesive layers 7 and 12, and the piezoelectric vibrators 4 and 9 are held by the sintered bodies 6 and 11 having a spring property. It is performed so as to be sandwiched between the tools 8 and 13. Sintered body 6,1
Since 1 has minute irregularities peculiar to the sintered bodies 6 and 11 on its surface, it comes into partial contact with the holders 8 and 13, and the piezoelectric vibrators 4 and 4 are provided to stabilize the holding. 9
The effective contact area can be reduced by increasing the contact area between the (actually, the sintered body 6, 11) and the holder 8, 13.

Therefore, by holding the piezoelectric vibrators 4 and 9 via the sintered bodies 6 and 11, it is possible to reduce the suppression of vibration of the piezoelectric vibrators 4 and 9 and to hold the holders 8 and 13. Since the vibration leaking through can be reduced, the deterioration of the characteristics of the piezoelectric vibrators 4 and 9 due to the holding can be extremely reduced.

In each of the above embodiments, the case where a metal sintered body is used has been described, but the present invention is not limited to this, and a sintered body formed of ceramic or the like may be used. .

Further, in each of the embodiments, the structure in which the sintered body is adhered to the piezoelectric vibrator to form the holding portion has been described, but the present invention is not limited to this. For example, a holding structure in which a sintered body formed of metal or ceramic is adhered to the holder, and the piezoelectric vibrator is held through the sintered body, and further, both the piezoelectric vibrator and the holder are made of metal or A holding structure may be used in which a sintered body such as ceramic is adhered to hold the vibrator through the sintered body.

[0020]

As described above, according to the piezoelectric vibrator holding structure of the present invention, the piezoelectric vibrator is held by the holder via the sintered body having fine irregularities on the surface. It is possible to realize both stable holding by increasing the area of the holding portion and holding with less deterioration of the piezoelectric vibrator characteristics by reducing the effective contact area at the same time.

Further, since the piezoelectric vibrator is held through the sintered body of an elastically stable inorganic material such as metal or ceramic, the sintered body is not plastically deformed by the holder, so that the sintered body is held. Can be thinned. Therefore, the influence of the sintered body on the piezoelectric vibrator can be minimized, and moreover, stable holding with little change over time can be realized.

[Brief description of drawings]

FIG. 1 is a perspective view of a piezoelectric vibrator used in a holding structure according to a first embodiment of the present invention.

FIG. 2 is a schematic view of a piezoelectric vibrator holding structure according to the first embodiment of the present invention.

FIG. 3 is a perspective view of a piezoelectric vibrator used in a holding structure according to a second embodiment of the present invention.

FIG. 4 is a schematic view of a piezoelectric vibrator holding structure according to a second embodiment of the present invention.

FIG. 5 is an enlarged view of a holding portion in a holding structure for a piezoelectric vibrator according to each embodiment of the present invention.

FIG. 6 is a perspective view of a conventional holding structure for a rectangular plate type piezoelectric vibrator.

FIG. 7 is a perspective view of a conventional holding structure for a rectangular plate type piezoelectric vibrator.

[Explanation of symbols]

 4,9 Piezoelectric vibrator 6,11 Sintered body 8,13 Holder

Claims (4)

[Claims] 1. A piezoelectric vibrator holding structure using a piezoelectric material, wherein the piezoelectric vibrator is held by a holder via a sintered body having fine irregularities on its surface. Vibrator holding structure. 2. The holding structure for a piezoelectric vibrator according to claim 1, wherein the sintered body is made of metal or ceramic. 3. The holding structure for a piezoelectric vibrator according to claim 1, wherein the holder has a spring property. 4. The holding structure for a piezoelectric vibrator according to claim 1, wherein the piezoelectric vibrator is held near a vibration node of the piezoelectric vibrator.