JPS62209998A - Vibrator - Google Patents

Abstract

PURPOSE:To allow the user to obtain easily a different characteristic from a single vibrator by forming splittingly at least a vibrator electrode of one face of the element into plural number. CONSTITUTION:The plural split vibrator electrodes are formed to at least one face of the element. For example, plural split electrode films 4, 5, 6 are formed on the upper face of the piezoelectric element 2, any of the split electrode films 4, 5, 6 is selected and a lead is connected to the elected electrode film, then the resonance frequency characteristic corresponding to the area of the selected split electrode film is obtained. In connecting >=2 of the plural split electrode films 4, 5, 6 by leads together, the resonance frequency characteristic corresponding to the total sum of the areas of the selected split electrode films is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of the Invention This invention relates to, for example, a
A that detects the acoustic emission) signal
The present invention relates to a vibrator used as an E-sensor or an ultrasonic oscillator.

(0) Disclaimer of the Invention Conventionally, as the vibrator of the above-mentioned example, there is a vibrator having the following structure, for example.

That is, it is a vibrator in which electrode films as vibrator electrodes are printed on both the front and back surfaces of a cylindrical piezoelectric element made of a semiconductive barium titanate sintered body or the like, covering the entire area of these opposing surfaces.

This vibrator is used to convert electrical energy into vibration energy or vice versa, but the vibrator having the conventional structure described above has the following problems.

In other words, since the area of the electrode film mentioned above is fixed depending on the shape of the piezoelectric element, characteristics such as natural resonance frequency are limited depending on the shape of the piezoelectric element, and in order to obtain a specific different vibrator, it is necessary to or the composition and degree of sintering of the semiconducting barium titanate sintered body mentioned above, it is impossible for the user to obtain different characteristics from a single vibrator. Ta.

(c) Purpose of the Invention The present invention aims to provide a vibrator that allows a user to easily obtain different characteristics from a single vibrator by making the structure of the vibrator electrode unique. .

(d) Summary of the Invention The present invention is characterized in that it is a vibrator in which a vibrator electrode on at least one side of the element is divided into a plurality of parts.

(e) Effects of the invention According to this invention, at least one side of the above-mentioned element has
Since a plurality of divided vibrator electrodes are formed, for example, the lead wire connection position for the plurality of vibrator electrodes can be selected to select an arbitrary vibrator electrode, or the vibrator electrode to be used can be selected. You can increase or decrease the number by connecting the lead wire,
Furthermore, by short-circuiting any number of electrodes of the plurality of divided vibrator electrodes, the user can easily obtain various characteristics from a single vibrator.

In addition, on the manufacturing side, the shape, composition, and degree of sintering of the element can be made constant, which has the effect of improving productivity.

(f) Examples of the invention An embodiment of the present invention will be described in detail below based on the drawings.

The drawing shows a vibrator, and in FIG. 1, this vibrator 1 has a cylindrical Vi electric element 2 formed of ceramic such as a semiconductive barium titanate sintered body, and a lower surface of this piezoelectric element 2. An electrode film 3 as a vibrator electrode is printed over the entire area, and a plurality of concentric divided electrode films 4, 5, and 6 having mutually different areas are printed on the upper surface of the piezoelectric element 2. There is.

In the above-mentioned vibrator configured in this way, for example, when an alternating electric field is applied to the above-mentioned piezoelectric element 2, mechanical vibration at a predetermined resonance frequency can be obtained, and the inverse vibration energy can be converted into electrical energy. You can also.

By the way, on the upper surface of the piezoelectric element 2 described above, there is a divided electrode film 4.
Since a plurality of electrodes 5.6 are formed, each of the above-mentioned divided electrodes 1
By selecting one of 1 m4 and 5.6 m and connecting a lead wire to the selected divided electrode film, it is possible to obtain resonance frequency characteristics corresponding to the area of the selected divided electrode film.

Also, multiple divided electrodes 1t! When two or more E of 14.5.6 are connected at the same time with lead wires, a resonance frequency characteristic corresponding to the total area of the selected divided electrode films can be obtained.

Similarly, when two or more of the plurality of divided electrode films 4.5.6 described above are short-circuited to each other using lead wires or conductive paste, the result corresponds to the sum of the areas of the short-circuited divided electrode films. Resonant frequency characteristics can be obtained.

In fact, the area of the divided electrode film and the resonance frequency are approximately inversely proportional.

As a result, the user can easily obtain a variety of different characteristics from a single vibrator 1, and the manufacturer can keep the shape, composition, and degree of sintering of the piezoelectric element 2 constant. Therefore, there is an effect that productivity can be improved.

FIG. 2 shows another embodiment, and the vibrator 1' shown in the same figure is
An electrode film 3 is printed on the entire lower surface of the piezoelectric element 2, and on the upper surface of the piezoelectric element 2, a plurality of divided electrodes 1 with the same area corresponding to approximately a concave half of a circle are formed! ! 7, 8, 9, and 10 are printed and formed, respectively.

The vibrator 1' configured in this manner can also obtain a resonant frequency corresponding to the selected number a of the divided electrode films 7 to 10 in the same manner as described above.

The relationship between the selected number m of divided electrode films and the resonance frequency is shown in the following table.

When selecting a plurality of the above-mentioned divided electrode films 7 to 10, lead wires or solder (not shown) may be used to short-circuit each divided electrode film, and conductive wires such as those shown in FIG. A conductive paste 11 may be used as a paint.

Here, when the above-mentioned conductive pastes 1 to 11 are used,
It goes without saying that the contact area of the paste 11 with the surface of the piezoelectric element 2 is involved in the above-mentioned resonance frequency characteristics.

In summary, a plurality of divided electrode films 4 are provided on one side of the piezoelectric element 2.
10, a plurality of divided electrodes 114 to 1 are formed.
By selecting the lead wire connection position with respect to 0 and selecting an arbitrary divided electrode membrane, or increasing or decreasing the number of meters of divided electrode membranes 4 to 10 to be used by connecting the lead wires, there are multiple divided Wl. By short-circuiting any number of electrode films among the electrode films 4 to 10, the user can easily obtain various resonance frequency characteristics from a single camera element.

Regarding the correspondence between the structure of the present invention and the above-described embodiments, the element of the present invention corresponds to the piezoelectric element 2 of the embodiment, and similarly, the vibrator electrode corresponds to the electrode film 3 and was formed in segments. Although the vibrator electrodes correspond to the divided electrode films 4 to 10, the present invention is limited only to the configuration of the above-mentioned embodiments.
It's not a CD.

For example, semiconductive barium titanate sintered body so-called BaT
It goes without saying that the piezoelectric element 2 made of iO3 ceramics may be replaced by a piezoelectric element made of other PZT ceramics.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a perspective view of a vibrator, FIG. 2 is a perspective view of another embodiment of the IJitiF11 element, and FIG. 3 is an example of a short circuit between divided electrode films. FIG.

Claims (1)

[Scope of Claims] 1. A vibrator in which vibrator electrodes are formed on opposite surfaces of an element, wherein the vibrator electrode on at least one side of the element is divided into a plurality of parts.