KR100217551B1 - Piezoelectric transformer with high boosting ratio - Google Patents

Abstract

The present invention includes a piezoelectric plate 10 having a first main surface 12 and a second main surface 14 facing the first main surface 12, wherein the piezoelectric plate 10 divides the longitudinal direction. It has at least 1 area | region, 2nd area | region, and 3rd area | region, and a 1st area | region has the length of almost 1 / n (n is an integer of 3 or more) of the length of the piezoelectric plate 10 in the longitudinal direction. On the main surface 12 and the second main surface 14 of the first region, a first primary side electrode 22 and a second primary side electrode 24 are respectively provided opposite to each other, Between the first primary side electrode 22 and the second primary side electrode 24 is polarized in the thickness direction, so that the first region and the second region of the piezoelectric plate 10 are separated by a predetermined interval in the longitudinal direction. The secondary electrode 72 is provided, and the third region is provided between the first region and the second region, and has a length of 1 / n or less of the length of the piezoelectric plate 10 in the longitudinal direction. , The first main surface 12 and the second main surface 14 of the third region. The third primary side electrode 26 and the fourth primary side electrode 28 are provided opposite to each other, and the third primary side electrode 26 and the fourth primary side electrode 28 in the third region are provided. ) Is polarized in the thickness direction and the third primary side electrode 26 and the fourth primary side electrode 28 and the first primary side electrode 22 and the second primary side electrode 24 are predetermined. The piezoelectric transformer is electrically connected in a connected state, and the second region is polarized in the longitudinal direction.

Description

Piezoelectric transformer with high boost ratio

1 (a) to 1 (d) are diagrams for explaining a conventional piezoelectric trans device, the first (a) is a perspective view, the first (b) is a sectional view, the first (c) is a stress distribution diagram, the first (d) is an amplitude distribution chart.

2 (a)-(d) are views for explaining the piezoelectric trans device of the first embodiment of the present invention. FIG. 2 (a) is a perspective view, FIG. 2 (b) is a sectional view, and FIG. FIG. 2 is the stress distribution diagram and FIG. 2 (d) is the amplitude distribution diagram.

3 is a relationship diagram between the input voltage to the piezoelectric trans device of the first embodiment of the present invention and the latitude of the cold cathode tube.

4 (a) to 4 (e) are views for explaining the piezoelectric trans device of the second to fourth embodiments of the present invention. FIG. 4 (a) is a cross sectional view of the piezoelectric trans device of the second embodiment of the present invention. 4 (b) is a cross-sectional view of the piezoelectric trans device of the third embodiment of the present invention. 4 (c) is a cross-sectional view of the piezoelectric trans device of the fourth embodiment of the present invention, and (d) is a stress distribution diagram of the piezoelectric trans device shown in FIGS. 4 (a) to 4 (c). (e) is an amplitude distribution diagram of the piezoelectric trans device shown in FIGS. 4 (a) to 4 (c).

5 (a) to 5 (c) are diagrams for explaining the piezoelectric trans device of the fifth embodiment of the present invention. FIG. 5 (a) is a cross-sectional view, FIG. 5 (b) is a stress distribution diagram, and FIG. ) Is the amplitude distribution plot.

6 (a) to 6 (d) are views for explaining the piezoelectric trans device of the sixth embodiment of the present invention. FIG. 6 (a) is a perspective view, FIG. 6 (b) is a sectional view, and FIG. FIG. 6 is the stress distribution diagram and FIG. 6 (d) is the amplitude distribution diagram.

7 (a) to 7 (d) are diagrams for explaining the piezoelectric trans devices of the seventh and eighth embodiments of the present invention. FIG. 7 (a) is a cross-sectional view of the piezoelectric trans devices of the seventh embodiment of the present invention. 7 (b) is a cross-sectional view of the piezoelectric trans device according to the eighth embodiment of the present invention. FIG. 7 (c) is a stress distribution diagram of the piezoelectric trans device shown in FIGS. 7 (a) and 7 (b). Fig. 7 (d) is an amplitude distribution diagram of the piezoelectric trans device shown in Figs. 7 (a) and 7 (b).

8 is a perspective view of a piezoelectric trans device of a ninth embodiment of the present invention.

9 is a perspective view of a piezoelectric trans device of a tenth embodiment of the present invention.

10 (a) to 10 (c) are views for explaining the piezoelectric trans device and the driving method thereof according to the eleventh embodiment of the present invention. FIG. 10 (a) is a perspective view, FIG. 10 (b) is a stress distribution diagram, 10 (c) is an amplitude distribution plot.

11 (a) to 11 (d) are views for explaining the piezoelectric trans device of the twelfth embodiment of the present invention. FIG. 11 (a) is a perspective view, 11 (b) is a sectional view, and 11 (c). FIG. 11 is the stress distribution diagram and FIG. 11 (d) is the amplitude distribution diagram.

12 (a) to 12 (d) are views for explaining the piezoelectric trans device of the thirteenth embodiment of the present invention. FIG. 12 (a) is a perspective view, 12 (b) is a sectional view, and 12 (c) Fig. 12 is the stress distribution diagram, and Fig. 12 (d) is the amplitude distribution diagram.

FIG. 13 is a perspective view for explaining a method for manufacturing a piezoelectric trans device of a thirteenth embodiment of the present invention. FIG.

Fig. 14 is a relationship diagram between the input voltage to the piezoelectric trans device of the thirteenth embodiment of the present invention and the brightness of the cold cathode tube;

15 (a) to 15 (d) are views for explaining the piezoelectric trans device of a fourteenth embodiment of the present invention. FIG. 15 (a) is a perspective view, fifteen (b) is a sectional view, and fifteen (c) FIG. 15 is the stress distribution diagram and FIG. 15 (d) is the amplitude distribution diagram.

16 (a) to 16 (d) are diagrams for explaining the piezoelectric trans device of the fifteenth and sixteenth embodiments of the present invention. FIG. 16 (a) is the piezoelectric trans device of the fifteenth embodiment of the present invention. 16 (b) is a cross-sectional view of the piezoelectric trans device according to the sixteenth embodiment of the present invention. FIG. 16 (c) is a stress distribution diagram of the piezoelectric trans device shown in FIGS. 16 (a) and 16 (b). 16 (d) is an amplitude distribution diagram of the piezoelectric trans device shown in FIGS. 16 (a) and 16 (b).

17 (a) -17 (d) are views for explaining the piezoelectric trans device of the seventeenth embodiment of the present invention. FIG. 17 (a) is a perspective view, 17 (b) is a sectional view, and 17 (c) FIG. 17 is the stress distribution diagram, and FIG. 17 (d) is the amplitude distribution diagram.

18 (a) to 18 (c) are diagrams for explaining the piezoelectric trans device of the eighteenth embodiment of the present invention. FIG. 18 (a) is a sectional view, 18 (b) is a stress distribution diagram, and 18th (c) ) Is the amplitude distribution plot.

19 (a) to 19 (e) are diagrams for explaining the piezoelectric trans device of a nineteenth embodiment of the present invention. FIG. 19 (a) is a top perspective view, and FIG. 19 (b) is a bottom perspective view, and FIG. c) is a sectional view, 19 (d) is a stress distribution, 19 (e) is an amplitude distribution.

20 (a) to 20 (d) are cross-sectional views for explaining a method for manufacturing a piezoelectric trans device of a nineteenth embodiment of the present invention.

21 (a) to 21 (e) are diagrams for explaining the piezoelectric trans device of the twentieth embodiment of the present invention. FIG. 21 (a) is a top perspective view, FIG. 21 (b) is a bottom perspective view, and FIG. c) turning section. Fig. 21 (d) is a stress distribution diagram, and Fig. 21 (e) is an amplitude distribution diagram.

Fig. 22 is a sectional view for explaining the piezoelectric trans device of the twenty-first embodiment of the present invention.

23 (a) -23 (d) are views for explaining the piezoelectric trans device of a twenty-second embodiment of the present invention. FIG. 23 (a) is a perspective view, 23 (b) is a sectional view, and 23 (c) FIG. 23 is the stress distribution diagram and FIG. 23 (d) is the amplitude distribution diagram.

24 is a perspective view for explaining the piezoelectric transformer of the twenty-third embodiment of the present invention.

25 is a perspective view for explaining the piezoelectric transformer of the twenty-fourth embodiment of the present invention.

FIG. 26 is a perspective view for explaining a piezoelectric transformer of a twenty-fifth embodiment of the invention; FIG.

27 (a) -27 (d) are views for explaining the piezoelectric trans device of a twenty-sixth embodiment of the present invention. FIG. 27 (a) is a perspective view, FIG. 27 (b) is a sectional view, and 27 (c) Fig. 1 is the stress distribution diagram and Fig. 27 (d) is the amplitude distribution diagram.

28 is a perspective view for explaining a piezoelectric trans device of a twenty-seventh embodiment of the present invention.

Fig. 29 is a perspective view for explaining the piezoelectric transformer device and mounting method thereof according to the twenty-eighth embodiment of the present invention.

30 is a piezoelectric trans device of a twenty-eighth embodiment of the present invention, in which a primary side impedance characteristic of the piezoelectric trans device is suspended in the air by a lead wire;

31 is a piezoelectric trans device of a twenty-eighth embodiment of the present invention, in which the primary-side impedance characteristics of the piezoelectric trans device are mounted as shown in FIG.

32 is a piezoelectric trans device of a twenty-eighth embodiment of the present invention, in which the secondary impedance characteristic of the piezoelectric trans device is suspended in the air by a lead wire;

33 is a piezoelectric trans device of a twenty-eighth embodiment of the present invention, in which the secondary impedance characteristics of the piezoelectric trans device are mounted as shown in FIG.

34 is a perspective view for explaining the piezoelectric transformer of the twenty-ninth embodiment of the present invention.

35 is a perspective view for explaining the piezoelectric transformer of the thirty-ninth embodiment of the present invention;

36 is a perspective view for explaining the piezoelectric transformer of the thirty-first embodiment of the present invention.

37 is a perspective view for explaining the piezoelectric transformer of the thirty-second embodiment of the present invention;

Fig. 38 is a perspective view for explaining the piezoelectric trans device of the thirty-third embodiment of the present invention.

39 (a) and 39 (b) are for explaining the piezoelectric trans device of the thirty-fourth embodiment of the present invention. FIG. 39 (a) is a perspective view and FIG. 39 (b) is a sectional view.

40 (a) to 40 (d) are views for explaining the piezoelectric trans device of a thirty-fifth embodiment of the present invention. FIG. 40 (a) is a perspective view, FIG. 40 (b) is a sectional view, and 40 (c) Figure 40 is the stress distribution diagram, and 40 (d) is the amplitude distribution diagram.

41 (a) to 41 (c) are for explaining the piezoelectric transformer of the 36th embodiment of the present invention. FIG. 41 (a) is a perspective view, 41 (b) is a stress distribution diagram, and 41 (c) is a Amplitude distribution.

42 is a perspective view for explaining a method for manufacturing a piezoelectric transformer device according to a 36th embodiment of the present invention.

43 (a) -43 (e) illustrate a piezoelectric trans device according to a thirty-seventh embodiment of the present invention. FIG. 43 (a) is a top view, 43 (b) is a bottom view, and 43 (c). ) Is a sectional view taken along line ZZ of FIG. 43 (a). FIG. 43 (d) is a stress distribution diagram, and 43 (e) is an amplitude distribution diagram.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to piezoelectric transformers, in particular cold cathode fluorescent lamps (hereinafter referred to as LCDs) used for backlighting of liquid crystal displays (hereinafter referred to as LCDs). The present invention relates to a piezoelectric transformer suitably used for lighting.

In portable devices equipped with an LCD panel such as a notebook type personal computer, miniaturization and power consumption have been demanded. The CFL widely used as the backlight of this LCD panel requires a high voltage of 1 kV or more at the start of lighting and a high voltage of several hundred V when continuously lit. As a result, high boost winding transformers have been used as transformers, but they are reaching the limits of high performance in terms of efficiency and size.

In recent years, a CFL lighting unit using a piezoelectric transformer that can realize a smaller size and higher efficiency has been developed for this LCD panel (see Japanese electronics, January 1, 1994 (No. 621), pages 147 to 157). .). The piezoelectric transformer used here has a structure called a ROSEN type, and since the boost ratio is still insufficient, a commercially available CFL lighting unit is to install a winding transformer at the front of the piezoelectric transformer.

1 (a) to 1 (d) are for explaining the conventional ROSEN type piezoelectric trans device. FIG. 1 (a) is a perspective view, FIG. 1 (b) is a sectional view and FIG. 1 (c) is a stress distribution diagram. 1 (d) is an amplitude distribution diagram.

The primary electrode 22 is provided on the left side (primary side) half of the upper surface 12 of the piezoelectric ceramic substrate 10 on the rectangular parallelepiped, and the lower surface of the piezoelectric ceramic substrate 10 faces the primary electrode 22. The primary electrode 24 is also provided at 14 so that the piezoelectric ceramic substrate 10 between the primary electrode 22 and the primary electrode 24 is in the thickness direction between the upper surface 12 and the lower surface 14. It is polarized. The secondary electrode 72 is provided on the secondary end surface 17 perpendicular to the upper surface 12 and the lower surface 14, and the piezoelectric ceramic substrate between the primary electrode 22, 24 and the secondary electrode 72 ( 10) is polarized in its longitudinal direction. One end of the power supply 200 is connected to the primary electrode 22 through the connection portion 122, and the other end thereof is connected to the primary electrode 24 through the contact portion 124. The secondary electrode 72 is connected to one end of the CFL 400 as a load, and the other end of the CFL 400 is connected to the primary electrode 24 via the connecting portion 124.

When a voltage is applied between the power supply 200 and the primary electrodes 22, 24, an electric field is applied in the thickness direction on the left half, and a longitudinal direction is caused by the piezoelectric transverse effect displaced in the direction perpendicular to the polarization direction. Longitudinal vibration is excited and the whole of the piezoelectric trans device 100 vibrates. In addition, at the right half, the same frequency as the primary voltage applied between the secondary side electrodes 72 and the primary side electrodes 22 and 24 due to the piezoelectric longitudinal effect in which mechanical unevenness occurs in the longitudinal direction and a potential difference in the polarization direction occurs. To pull out the voltage. When a driving voltage having a frequency equal to the resonance frequency of the piezoelectric transformer element 100 is applied between the primary electrodes 22 and 24, a very high boost ratio can be obtained.

However, for example, piezoelectric transformers using PZT (lead tiatnate zirconate) -based ceramics are used as boost transformers for CFL-lighted inverters used in LCD panels of A4 size notebook type personal computers. It is also necessary to apply a considerable amount of input voltage, so the boost ratio is still insufficient.

Accordingly, a main object of the present invention is to provide a piezoelectric transformer having a high boost ratio.

According to the present invention, there is provided a piezoelectric plate having a first main surface and a second main surface facing the first main surface described above, so long as the first main surface and the second main surface extend. Direction is the longitudinal direction of the piezoelectric plate described above, and the piezoelectric plate has at least a first region, a second region, and a third region dividing the above-mentioned longitudinal direction. The first region has a length in the above-mentioned longitudinal direction of the piezoelectric plate having a length of approximately 1 / n (N is an integer of 2 or more), and the above-mentioned first main surface and second of the first region. A first primary side electrode and a second primary side electrode are respectively provided on the main surface of the first surface side opposite to each other so that the first primary side electrode and the second primary side electrode of the first region are separated from each other. Polarized in the thickness direction between the main surface of the film and the second main surface, and the first region described above Secondary electrodes are provided in the second region of the piezoelectric plate spaced apart by a predetermined distance in the longitudinal direction, and the third region is formed by the first region and the second region. A third primary side of said piezoelectric plate having a length equal to or less than 1 / n of said length in said longitudinal direction, said first main surface and said second main surface of said third region; An electrode and a fourth primary side electrode are provided to face each other, and the polarization is performed in the predetermined direction in the thickness direction between the third primary side electrode and the fourth primary side electrode in the third region. At the same time, the third primary side electrode and the fourth primary side electrode, the first primary side electrode and the second primary side electrode are electrically connected in a predetermined connection state. The first piezoelectric transformer in which the second region is polarized in the length direction described above Is provided.

The resonance mode is determined by the input frequency of the primary electrode, the properties of the piezoelectric plate and the length of the vibration direction, but the length of 1 / n in the longitudinal direction of the piezoelectric plate corresponds to the half wavelength of the resonance mode. Therefore, for example, if the resonance mode is 1.5 wavelength, n is 3, and if 1 wavelength, n is 2. Since the resonance mode in the piezoelectric transformer takes a large number of waves, n takes an integer of 2 or more.

In the present invention, the length of the piezoelectric plate in the longitudinal direction is approximately 1 / n (n is an integer of 2 or more). The first primary electrode and the first main surface and the second main surface of the first region have a length of about 1 / n. The second primary electrodes are disposed to face each other, and polarize between the first primary electrode and the second primary electrode in the first region in the thickness direction between the first main surface and the second main surface, In a piezoelectric transformer in which a secondary electrode is provided in a second region of a piezoelectric plate spaced at a predetermined interval in the longitudinal direction from the first region, between the first region and the second region of the piezoelectric plate. There is a third region, and since the third primary side electrode and the fourth primary side electrode are provided opposite to each other on the first main surface and the second main surface of the third region, the electrode area on the primary side is more. The larger the input impedance of the piezoelectric transformer is. As a result, electric energy is easily supplied from the power source to the piezoelectric transformer.

In the present invention, since the first region has a length of approximately 1 / n (n is an integer of 2 or more) in the longitudinal direction of the piezoelectric plate, the first region is resonated in the longitudinal direction of the piezoelectric plate. It has a length of half a wavelength of the stress distribution of the stress distribution, and becomes a region of the piezoelectric plate in which either a positive or negative stress occurs in the longitudinal direction at the time of resonance. In addition, since the third region has a length equal to or less than 1 / n of the length of the piezoelectric plate, the third region has a length less than half the wavelength of the stress distribution during resonance in the longitudinal direction of the piezoelectric plate. It is an area | region in which either a positive or negative stress generate | occur | produces in the longitudinal direction at the time. The third primary side electrode and the fourth primary side electrode are disposed on the first main surface and the second main surface of the third region so as to face each other, so that the third primary side electrode and the fourth primary side electrode of the third region While the primary electrodes are polarized in a predetermined direction in the thickness direction, the third primary electrode, the fourth primary electrode, the first primary electrode, and the second primary electrode are in a predetermined connection state. The third and second primary electrodes and the first region of the first region in the first region in accordance with the direction of the stress generated in the third region at the time of idling. The region of may oscillate, and as a result, the resonance is further increased by the third region so that the primary side is converted into mechanical elastic energy more efficiently than the electrical energy of the input.

On the other hand, by providing the third region, the piezoelectric ceramic substrate between the secondary electrode and the end portion on the secondary side electrode of the third primary electrode and the fourth primary electrode provided in the third region is removed. And polarized in the longitudinal direction so that the second primary electrode and the second primary electrode and the second primary electrode of the first region and the secondary electrode side of the second primary electrode are not provided with the third region. The secondary side is shorter in the longitudinal direction than in the case where the piezoelectric ceramic substrate between the secondary electrodes is polarized in the longitudinal direction. In this manner, when the distance between the primary electrode and the secondary electrode is shortened, the output impedance becomes small. When the output impedance of the piezoelectric transformer decreases, the voltage applied to the load connected to the secondary side of the piezoelectric transformer increases.

Thus, by providing a 3rd area | region like this invention, the input impedance of a piezoelectric transformer becomes small, it is easy to supply electrical energy from a power supply to a piezoelectric transformer, and the electrical energy of an input on a primary side is more efficiently mechanically. It can be converted into elastic energy, and the output impedance can be made small, and the voltage applied to the load connected to the secondary side of the piezoelectric transformer is increased, so that the effective boosting ratio of the piezoelectric transformer is increased.

In addition, since the distance between the primary side electrode and the secondary side electrode is shortened by providing the third region like the present invention between the first region and the second region, the third primary electrode provided in the third region. And when polarizing the piezoelectric ceramic substrate between the end of the secondary side electrode and the secondary side of the fourth primary electrode in the longitudinal direction in the longitudinal direction, it is applied at the time of polarization as compared with the case where this third region is not provided. Absolute voltage decreases. As a result, the countermeasure of a high pressure becomes easy, and a power supply for polarization can also use a lower pressure.

In addition, the present invention works more effectively when the load connected to the secondary side of the piezoelectric transformer is CFL. The CFL requires a high voltage of 1 kV or more at the start of discharge. On the other hand, the boost ratio of the piezoelectric transformer is proportional to Qm, which is a quality factor of the resonator. Prior to the start of discharge, the impedance of the CFL is close to infinity, so that the boost ratio is proportional to the Qm of the piezoelectric transformer itself, so that the boost ratio is large. Thus, by providing the third region as in the present invention, the distance between the primary electrode and the secondary electrode is shortened, so that the boost ratio determined from the shape of the secondary side becomes small, as described above. Since Qm greatly contributes to the boosting ratio, the boosting up to the voltage at which discharge is started becomes easy. When the discharge starts, the impedance of the CFL decreases, but by providing the third region as in the present invention, the output impedance of the piezoelectric transformer decreases as described above, so that the voltage applied to the CFL can be increased accordingly.

When the third region is provided between the first region on the primary side and the secondary electrode as in the present invention, the third primary electrode and the fourth primary electrode provided on the third region are used. By adjusting the size, the output impedance of the piezoelectric transformer as well as the output impedance can be adjusted, thereby increasing the degree of freedom in design.

In addition, the third region is oscillated so as to further increase resonance excited by the first region and the first and second primary electrodes, so that the direction of stress generated in the third region during resonance When the direction of the stress in the first region is opposite to that of the first region, the polarization direction between the third primary electrode and the fourth primary electrode of the third region is determined as the first primary electrode and the second electrode of the first region. The third primary side electrode and the second primary side electrode are electrically connected to each other, and the fourth primary side electrode and the first primary side electrode are electrically connected at the same time as the polarization direction between the primary side electrodes. .

In addition, the third region is oscillated to further increase the resonance excited by the first region and the first and second primary electrodes. When the direction of the stress in the region is reversed, the polarization direction between the third primary electrode and the fourth primary electrode of the third region is determined by the first primary electrode and the second primary electrode of the first region. The third primary side electrode and the first primary side electrode may be electrically connected to each other and the fourth primary side electrode and the second primary side electrode may be electrically connected to each other while being opposite to the polarization direction therebetween.

Moreover, the distance between the third region and the first region is used to oscillate the third region so as to further increase the resonance excited by the first region and the first and second primary electrodes. Is a distance of 1 / n or more of the length in the longitudinal direction, and when the direction of the stress generated in the third region at resonance is the same as the direction of stress generated in the first region at resonance, the third primary side of the third region The polarization direction between the electrode and the fourth primary side electrode is the same as the polarization direction between the first primary side electrode and the second primary side electrode in the first region, and the third primary side electrode and the first primary side It is good to electrically connect an electrode, and to electrically connect a 4th primary side electrode and a 2nd primary side electrode.

In addition, the stress distribution during resonance in the longitudinal direction is made to have a length of 1 / n or less of the length in the longitudinal direction of the piezoelectric plate between the first region on the primary side and the second region on the secondary side. The first main surface of the fourth region and a fourth region having a length less than or equal to the wavelength of the first region in which the stress occurs only in the same direction as the direction of the stress generated in the first region upon resonance. The fifth primary side electrode and the sixth primary side electrode are provided on the second main surface so as to face each other, so that the polarization direction between the fifth primary side electrode and the sixth primary side electrode in the fourth region is changed to the first side. The polarization direction between the first primary side electrode and the second primary side electrode of the region is the same, and the fifth primary side electrode and the first primary side electrode are electrically connected, and the sixth primary side electrode and the By electrically connecting the primary electrodes of 2, the excitation of the first and second primary electrodes in the first region You can increase your jeans even further. In addition, as long as it is closer to the secondary electrode among the end portions on the secondary side electrode side of the third primary side electrode and the fourth primary side electrode and the ends on the secondary side electrode side of the fifth primary side electrode and the sixth primary side electrode. It is preferable to polarize the piezoelectric ceramic substrate between the end of the side and the secondary electrode in the longitudinal direction.

Further, a fifth region and a sixth region that divide the longitudinal direction are further provided on the piezoelectric plate, and the fifth region is provided on the side opposite to the first region with respect to the second region, and the length of the fifth region is piezoelectric. The length of the substrate in the longitudinal direction is approximately 1 / n, and the seventh primary electrodes are provided on the first main surface and the second main surface of the fifth region to face each other. Polarizing the seventh primary side electrode and the eighth primary side electrode in a predetermined direction in the thickness direction, the seventh primary side electrode and the eighth primary side electrode, the first primary side electrode and the second The primary electrode is electrically connected to the predetermined connection state, and the sixth region is provided between the fifth region and the second region, and the length of the sixth region is the length in the longitudinal direction of the piezoelectric plate. The first primary side and the second primary side of the ninth primary side and the tenth primary side of the first main surface and the second main surface of the sixth region, respectively, The poles are provided to face each other so that the ninth primary side electrode and the tenth primary side electrode in the sixth region are polarized in a predetermined direction in the thickness direction and at the same time, the ninth primary side electrode and the tenth side The primary side electrode, the first primary side electrode, and the second primary side electrode are electrically connected in a predetermined connection state, and the secondary side electrode is provided on at least one of the first or second main surfaces, and the secondary side electrode By polarizing the second regions on both sides in the longitudinal direction, the fifth region has a length of half the wavelength of the stress distribution at the resonance in the longitudinal direction of the piezoelectric plate and has either the positive or negative stress in the longitudinal direction at the resonance. This fifth region is formed so as to further increase resonance excited by the first and second primary side electrodes and the first region according to the direction of the stress generated in the fifth region at the time of resonance. And the sixth region is a piezoelectric In the longitudinal direction of the plate has a length of less than half the wavelength of the stress distribution at the time of resonance, and a region in which either positive or negative stress occurs in the longitudinal direction at the time of resonance, and according to the stress direction generated in the sixth region at the time of resonance, The sixth region can be caused to vibrate to further increase the resonance excited by the first and second primary electrodes and the first region, so that energy can be injected into the piezoelectric transformer from both sides of the secondary electrode. As a result, the boosting ratio of the piezoelectric transformer can be further increased.

This piezoelectric transformer is suitably applied when the resonant mode is a resonant mode in which a stress distribution of at least 1.5 wavelengths or more (preferably 1.5 wavelengths or more and an integer multiple of 1/2 wavelength) exists in the longitudinal direction.

The second region, the third region, and the sixth region are in the direction of the first or second main surface of the stress distribution at the time of resonance, and the same half wavelength at which stress is generated by either compression or pulling. You may coexist in an area | region. For this purpose, the length in the longitudinal direction of the region including the second region, the third region, and the sixth region may be 1 / n or less of the length in the longitudinal direction of the piezoelectric plate.

In addition, the first region and the fifth region are provided symmetrically with respect to the second region, and the third region and the sixth region are also provided symmetrically with respect to the second region. Double energy can be injected when the area 3 is provided only on one side of the second area.

In the above piezoelectric transformer, the piezoelectric plate has a first cross section and a second cross section orthogonal to the longitudinal direction, and the first and second primary electrodes have a first cross section in the first cross section. Extending in the longitudinal direction to a distance position of about 1/2 of the distance between the second end face and the second end face, wherein the third and fourth primary side electrodes are provided with the first and second primary side electrodes. And a third region is provided apart from the secondary side electrode, the third region is polarized in the same direction as the polarization direction of the first region in the thickness direction, and the fourth primary electrode and the first primary electrode are electrically connected to each other. The piezoelectric transformer having the third primary electrode and the second primary electrode electrically connected to the piezoelectric transformer having one wavelength stress distribution in the longitudinal direction between the first end face and the second end face. Applied very well, it can also boost boost bils.

In the first piezoelectric transformer described above, the piezoelectric plate has a first cross section and a second cross section that are orthogonal to the longitudinal direction, and the first and second primary side electrodes are arranged from the first cross section to the first cross section. Extending in the longitudinal direction to a distance position of about one third of the distance between the cross section of the second cross section and the second cross section, wherein the third and fourth primary electrodes are disposed from the first cross section to the first position. The distance position of about 2/3 or less of the distance between a 1st cross section and a 2nd cross section from a 1st cross section from the distance position of about 1/3 length of the distance between a cross section and a 2nd cross section. The first and second primary electrodes and the secondary electrode are spaced apart from each other in the longitudinal direction, and the third region is polarized in the same direction as the polarization direction of the first region in the thickness direction. The primary electrode of 4 and the primary electrode of the first are electrically connected, and the primary electrode of the third and the secondary electrode of the secondary This electrically connected piezoelectric transformer is suitably applied to piezoelectric transformers having a 1.5 wavelength distribution in the longitudinal direction between the first end face and the second end face, which can also increase the boost ratio. .

In this case, on the first main surface and the second main surface of the predetermined region of the piezoelectric plate between the third and fourth primary side electrodes and the secondary side electrodes, the third and fourth primary side electrodes and the secondary side Apart from the electrodes, the fifth and sixth primary side electrodes are further provided, so that the piezoelectric plate between the fifth primary side electrode and the sixth primary side electrode is formed in the thickness direction of the first primary side electrode and the second primary side electrode. Polarize in the same direction as the polarization direction of the piezoelectric plate between the primary electrodes, electrically connect the fifth primary electrode and the first primary electrode, and electrically connect the sixth primary electrode and the second primary electrode. By connecting to, a piezoelectric transformer having a higher boost ratio is obtained. Further, it is preferable to polarize the piezoelectric ceramic substrate between the ends of the fifth primary electrode and the sixth primary electrode and the secondary electrode in the longitudinal direction in the longitudinal direction.

In the above first piezoelectric transformer, the piezoelectric plate has a first cross section and a second cross section that are orthogonal to the longitudinal direction, and the first and second primary side electrodes are formed from the first cross section to the first cross section. Each of which extends in the longitudinal direction to a distance position of about 1/2 of the distance between the end face and the second end face, and the third and fourth primary electrodes are provided apart from the secondary electrode, respectively. The third region is polarized in a direction opposite to the polarization direction of the first region in the thickness direction, and the third primary electrode and the first primary electrode are electrically connected to each other so that the fourth primary electrode and the second primary electrode are electrically connected. The piezoelectric transformer having the primary electrode electrically connected is suitably applied to piezoelectric transformers having a stress distribution of one wavelength in the longitudinal direction between the first end face and the second end face, thereby increasing the boost ratio. Can be.

In the first piezoelectric transformer, the piezoelectric plate has a first cross section and a second cross section that are orthogonal to the longitudinal direction, and the first and second primary electrodes have a first cross section and a first cross section. Each of which extends in the longitudinal direction to a distance position of about one third of the distance between the second end face, and the third and fourth primary side electrodes are provided with the first end face and the first end face in the first end face. 1st and 2nd 1 from the position of the distance of about 1/3 length of the distance between the cross section of 2 to the distance position of the length of about 2/3 or less of the distance of a 1st cross section and a 2nd cross section. It is provided apart from the secondary electrode and the secondary electrode, respectively, extending in the longitudinal direction, and the third region is polarized in the thickness direction opposite to the polarization direction of the first region, and the third primary electrode and the first electrode Piezoelectric such that primary electrodes of the electrode are electrically connected, and the fourth primary electrode and the second primary electrode are electrically connected. Lances, a is suitably applied to the piezoelectric transformer that the stress distribution of the wavelength of 1.5 in the longitudinal direction between the one-end face of the second end surface there may also be increased step-up ratio.

In this case, on the first main surface and the second main surface of the predetermined region of the piezoelectric plate between the third and fourth primary side electrodes and the secondary side electrodes, the third and fourth primary side electrodes and the secondary side The 5th and 6th primary electrodes are provided separately from the electrode, and the piezoelectric plate between the 5th primary electrode and the 6th primary electrode is located in the thickness direction, and the 1st primary electrode and 2nd 1 Polarize in the same direction as the polarization direction of the piezoelectric plate between the secondary electrodes, electrically connect the fifth primary electrode and the first primary electrode, and electrically connect the sixth primary electrode and the second primary electrode. By connecting, a piezoelectric transformer with a higher boost ratio is obtained. Further, it is preferable to polarize the piezoelectric ceramic substrate between the ends of the fifth primary electrode and the sixth primary electrode and the secondary electrode of the sixth primary electrode in the longitudinal direction.

In addition, the secondary electrode is preferably formed in a cross section orthogonal to the longitudinal direction of the piezoelectric plate. This is because it is easy to realize an ideal vibration mode.

Moreover, the secondary side electrode may be formed in at least one of the 1st main surface and the 2nd main surface of a piezoelectric board. In this manner, the secondary electrode can be formed simultaneously with the primary electrode in one film forming step. In addition, by adjusting the area of the secondary side electrode, the distance with the primary side electrode can be adjusted, and as a result, the output impedance of the piezoelectric transformer can be adjusted. On the other hand, the resonant frequency of the piezoelectric transformer is determined by the length in the longitudinal direction of the piezoelectric plate. Thus, by forming the secondary side electrode on at least one of the first main surface and the second main surface of the piezoelectric plate, it is possible to independently control the frequency of resonance and the output impedance. Further, in the case where the secondary side electrode is formed on both the first main surface and the second main surface of the piezoelectric plate, polarization in the longitudinal direction becomes easy.

In addition, the above piezoelectric transformers are integrally stacked in a thickness direction, and a primary side region of another piezoelectric transformer is laminated on the primary side region of each piezoelectric transformer, and a secondary side region of another piezoelectric transformer is laminated on the secondary side region of each piezoelectric transformer. Thus, the polarization direction of the primary region of these piezoelectric transformers and the connection state of the primary electrodes may be set so that these piezoelectric transformers further increase vibrations with each other. In this case, the piezoelectric transformers to be stacked are of the same structure, and the corresponding electrodes are preferably electrically connected in parallel.

In this case, since the input current flows by the number of stacked layers, when the input power is constant, the input voltage becomes one of the number of stacked layers, and the input voltage can be reduced. In addition, since the input current can flow by the number of stacked layers, the input power can be increased to drive at high power. On the other hand, in the case of using a piezoelectric transformer of a single plate, when the energy density rises due to the increase in power, the loss increases beyond the threshold determined by the material, resulting in a decrease in efficiency. In order to avoid this, it is possible to reduce the energy density in the piezoelectric plate and increase the total input power level by using the stack structure as described above. In addition, by integrating the plurality of piezoelectric transformers as described above, the vibration mode of the plurality of piezoelectric transformers can be made single. By providing the support portion of the piezoelectric transformer at the position of the vibration node in the resonance mode of each piezoelectric transformer, it is possible to prevent the conversion efficiency from being lowered without damaging the vibration of the piezoelectric transformer.

In addition, a part of the primary electrode is a return electrode provided by electrically insulated from the primary electrode, and the signal is used to monitor the vibration state of the piezoelectric transformer in the form of a small signal using the feedback electrode. Can be used to feed back the piezoelectric transformer and to oscillate the piezoelectric transformer by itself.

This self-oscillation can be caused by connecting an abnormal circuit and an amplifier circuit to the feedback electrode and applying the output of the amplifier circuit to the primary electrode. According to the present invention, in the first piezoelectric transformer, the piezoelectric plate has a first cross section and a second cross section that are orthogonal to the longitudinal direction, and the first and second primary electrodes are formed of the first piezoelectric transformer. Third and fourth primary side electrodes, which extend in the longitudinal direction and extend in the longitudinal direction, respectively, from the end face to a distance position of about one third of the length in the longitudinal direction of the piezoelectric plate. From the first end face to the distance position of about 1/3 length of the length in the longitudinal direction of the piezoelectric plate, from the first end face to the distance position of about 2/3 length of the length in the longitudinal direction of the piezoelectric plate Respectively extending in the longitudinal direction, a secondary side region is provided between the third region and the second end face, and the third region is polarized in the thickness direction opposite to the polarization direction of the first region, The first primary side electrode and the third primary side electrode are electrically connected The second primary side electrode and the fourth primary side electrode are electrically connected to each other, and the secondary side region includes a seventh region and a second region on the side of the second cross section, and the secondary side electrode has a second cross section. A first main surface of the piezoelectric plate in the vicinity of the second cross section, provided on at least one of the first main surface and the second main surface at a distance position of about 1/6 of the length in the longitudinal direction of the piezoelectric plate A second secondary electrode is provided at the second end face in at least one of the second main surfaces or in the longitudinal direction of the piezoelectric plate, and the seventh region is in the longitudinal direction of the piezoelectric plate from the second end face and the second end face. Between the positions of the distance of about 1/6 of the length, and polarized in the longitudinal direction, and the second region is about 1/6 of the length in the longitudinal direction of the piezoelectric plate from the second end face. About the length in the longitudinal direction of the piezoelectric plate from the position of the length distance and the second cross section A first piezoelectric transformer is provided between the positions of a length distance of 1/3 and polarized in opposite directions in the polarization direction and the longitudinal direction of the seventh region.

In this case, the ground side electrode and the second secondary side electrode of the third primary side electrode and the fourth primary side electrode are connected.

Preferably, the second primary side electrode and the fourth primary side electrode are electrodes on the ground side, the secondary side electrodes are provided only on the first main surface of the piezoelectric plate, and the second secondary side electrode is provided on the second side of the piezoelectric plate. It is installed only on the main surface of the.

According to the present invention, in the first piezoelectric transformer, the piezoelectric plate has a first cross section and a second cross section orthogonal to the longitudinal direction, and the first and second primary side electrodes are separated from the first cross section. In the longitudinal direction of the piezoelectric plate, the third and fourth primary electrodes provided in the third region and extending in the longitudinal direction to the distance position of about one third of the length, respectively, are formed in the first cross section. From the position of about one third of the length in the longitudinal direction of the piezoelectric plate to the position of about two thirds of the length in the longitudinal direction of the piezoelectric plate from the first end face, respectively. And a secondary side region is provided between the third region and the second end face, and the third region is polarized in the same direction as the polarization direction of the first region in the thickness direction, and with the first primary electrode. The fourth primary side electrode is electrically connected and the second primary side The electrode and the third primary side electrode are electrically connected, and the secondary side region has a seventh region and a second region on the side of the second cross section, and the secondary side electrode has a longitudinal direction of the piezoelectric plate from the second cross section. It is provided in at least one of the 1st main surface and the 2nd main surface in the position of about 1/6 length of the length in, and the 1st main surface and the 2nd main surface of the piezoelectric plate near a 2nd cross section A second secondary side electrode is provided on at least one or a second end face in the longitudinal direction of the piezoelectric plate, and the seventh region is in the longitudinal direction of the piezoelectric plate from the second end face and the second end face. The position of the length distance of about 1/6 in the longitudinal direction of the piezoelectric plate from the second cross-section, between the position of the distance of 1/6 length of length and polarized in the longitudinal direction And the position of the length distance of about 1/3 in the longitudinal direction of the piezoelectric plate in the second section And between, the piezoelectric transformer of claim 3, which is polarized in the opposite directions according to the polarization direction and the longitudinal direction of the seventh region.

Also in this case, the ground side electrode and the second secondary side electrode of the third primary side electrode and the fourth primary side electrode are connected.

In the above-described second and third piezoelectric transformers, the stress is zero at both ends of the secondary side region, the stress distribution of 1/2 wavelength exists in the secondary side region, and the stress is the same in the secondary side region. Direction. On the main surface of the piezoelectric plate in the center of the secondary side region, a secondary electrode on the high side is provided, and the secondary side regions on both sides of the secondary side electrode on the high side are polarized in the opposite direction in the longitudinal direction. The second secondary electrode on the ground side, which is provided at the end of the piezoelectric plate as an end of the secondary side region, is electrically connected to the primary electrode on the ground side.

In the present invention as described above, a second secondary electrode on the ground side is provided at the end of the secondary side of the piezoelectric plate and connected to the ground electrode on the primary side, and a secondary electrode is also provided at the center of the secondary region. Since this is the high voltage side, the distance between the electrodes on the secondary side is 1/2 compared to the case where the secondary side electrode on the high side is polarized at only the end of the secondary side and the entire secondary side region is polarized in one of the longitudinal directions. Since the electrode area is doubled, the capacitance on the secondary side is quadrupled and the output impedance is 1/4. Thus, when the output impedance of a piezoelectric transformer becomes small, the voltage applied to the load connected to the secondary side electrode of a piezoelectric transformer will increase by that much.

The stress is zero at both ends of the secondary side region, and there is a half-wave stress distribution in the secondary side region, the stress is in the same direction in the secondary side region, and the primary electrode on the ground side on both sides of the secondary side region. And a second secondary electrode, respectively, and a secondary electrode on the high pressure side is provided on the top of the stress distribution in the center of the secondary side region, and both sides of the secondary electrode are polarized in opposite directions, thereby forming the second secondary electrode in the secondary region. All the generated charges can be effectively taken out.

In this way, by providing the secondary electrode at the center portion in the longitudinal direction of the secondary side region, when polarizing the secondary side region, only the secondary side electrode of the high pressure side is provided at the end of the secondary side, so that the entire secondary side region is formed. Compared with the case where the longitudinal direction is polarized in one direction, the distance between the electrodes on the secondary side is 1/2, and the absolute voltage applied when polarizing becomes small. As a result, the countermeasure of high pressure becomes easy, and the power supply for polarization can also use lower pressure.

In addition, by installing the primary electrode on the ground side and the secondary electrode on the ground side only on the same main surface of the piezoelectric plate, and the secondary side electrode on the high pressure side only on the other main surface of the piezoelectric plate. The possibility of a short circuit between the second secondary side electrode and the primary side electrode on the ground side becomes small.

In each of the above piezoelectric transformers, at least a third secondary electrode facing the secondary electrode in the longitudinal direction of the piezoelectric plate is provided in the second region, and the secondary electrode and the third secondary electrode are provided. You can get the output between and.

In this way, the output power can be taken out by the secondary electrode and the third secondary electrode, so that the primary side and the ground potential do not have to be common on the secondary side. As a result, the circuits on the primary side and the circuits on the secondary side can be separated directly from each other, and earth electrodes independent of the primary side are formed on the secondary side, respectively, to form earth on the primary side and secondary on the secondary side. It becomes possible to insulate and to float without earthing the secondary side, and the noise resistance is also improved.

As described above, in a piezoelectric transformer having at least a third secondary electrode facing the secondary electrode in the longitudinal direction of the piezoelectric plate in the secondary region, the secondary electrode is used for vibration in the resonance mode of the piezoelectric transformer. By providing at the position of the node in the longitudinal direction, the electrical connection and the mechanical support on the secondary side can be facilitated without inhibiting the vibration in the longitudinal direction of the piezoelectric transformer.

The secondary side region between the secondary side electrode and the third secondary side electrode has a length equal to or less than half the wavelength of the stress distribution at the time of resonance in the longitudinal direction, and is positive or negative in the longitudinal direction at the time of resonance. In the region of the piezoelectric plate in which any one of the stresses occurs, the second secondary electrode and the third secondary electrode between the secondary electrode and the third secondary electrode are further disposed in the longitudinal direction opposite to the fourth secondary electrode and the third secondary electrode. The piezoelectric plate between the secondary side electrode and the fourth secondary side electrode is polarized in the longitudinal direction, and the piezoelectric plate between the third secondary side electrode and the fourth secondary side electrode is formed in the longitudinal direction. Polarization is performed in a direction opposite to the polarization direction between the secondary electrodes, and the output power is drawn between the secondary electrode and the third secondary electrode and the fourth secondary electrode, so that only the secondary electrode and the secondary electrode are formed in the secondary region. Secondary electrode and secondary secondary electrode Compared to the case where the poles are polarized in one of the longitudinal directions, the distance between the secondary electrodes is shorter and the electrode area is doubled, so the capacitance on the secondary side is more than doubled and the output impedance is 1/2 or less. do. As described above, when the output impedance of the piezoelectric transformer decreases, the voltage applied to the load connected to the secondary electrode of the piezoelectric trace increases by that much.

In this way, when the fourth secondary electrode is disposed between the secondary electrode and the third secondary electrode, the secondary side electrode and the third side electrode in the secondary side region are polarized between the secondary side electrode and the third secondary side electrode. The distance between the electrodes on the secondary side is shorter as compared with the case where a secondary side electrode is provided and polarized between the secondary side electrode and the third secondary side electrode in any one direction in the longitudinal direction, and the absolute voltage applied at the time of polarization becomes small. . As a result, the countermeasure of high pressure becomes easy, and the power supply for polarization can also be used with a thing of low pressure.

The secondary side region provided with at least the secondary side electrode and the third secondary side electrode which are opposed to each other in the longitudinal direction of the piezoelectric substrate is a secondary side region provided with a plurality of secondary side electrodes facing each other in the longitudinal direction. By polarizing the piezoelectric plates between the plurality of secondary side electrodes in the longitudinal direction, the output power can be extracted from at least two predetermined secondary side electrodes which face each other in the longitudinal direction among the plurality of secondary side electrodes.

Further, the first output power is extracted from the first predetermined two or more secondary side electrodes facing in the longitudinal direction among the plurality of secondary side electrodes facing in the longitudinal direction of the piezoelectric plate, and the first of the plurality of secondary side electrodes is taken out. It is also possible to extract the second output power from the second predetermined second or more secondary side electrodes which are opposed to each other in the longitudinal direction as a second predetermined second or more secondary side electrode which is different from the predetermined second or more secondary side electrodes. .

A plurality of secondary side electrodes that face in the longitudinal direction may be provided on both main surfaces of the piezoelectric plate and on both main surfaces of the second main surface.

A plurality of secondary electrodes facing each other in the longitudinal direction may be provided in plural rows in the width direction of the piezoelectric plate perpendicular to the longitudinal direction.

In each of the piezoelectric transformers described above, the output can be drawn out between the secondary electrode and the ground electrode in the third or fourth primary electrode.

Moreover, according to this invention, the 1st main surface, the 2nd main surface corresponding to the said main surface, and the 1st cross section or 2nd orthogonal to the 1st direction which is a direction in which one side of the said 1st main surface extends, A piezoelectric plate having a substantially rectangular parallelepiped having a cross section of the first and second primary side electrodes formed from the first cross section on the first main surface and the second main surface of the piezoelectric plate; Extending in the first direction to a distance position of about 1/3 of the distance between the cross section of the second cross section and the second cross section, wherein third and fourth primary electrodes are disposed on the piezoelectric plate. On the first main surface and the second main surface, the first first surface from the position of the distance of about 1/3 of the distance between the first cross section and the second cross section from the first cross section; About 2/3 of the distance between the first end face and the second end face And the piezoelectric plates between the first primary side electrode and the second primary side electrode are disposed in the thickness direction between the first main surface and the second main surface, respectively, extending in the first direction to the position of Lee. In the thickness direction is polarized, and the third primary side electrode and the fourth primary side electrode are polarized in the above-mentioned thickness direction, and the piezoelectric plate between the third primary side electrode and the fourth primary side electrode The first primary side electrode and the second primary side electrode are electrically connected in a predetermined connection state, and the first end face and the second end face are separated from the second end face in the first direction. The predetermined region in the piezoelectric plate up to the position of the distance of about one third of the distance between the end face is the secondary side region, and the second end face of the secondary side region or the first end near the second end face. At least a secondary side electrode is provided on the main surface of 1, and the -Region has at least the piezoelectric transformer of claim 4 which is between the outlet side of the primary-side electrode and said third electrode is polarized in the direction of the first is provided for.

This fourth piezoelectric transformer is suitably applied to piezoelectric transformers having a stress distribution of 1.5 wavelengths in the first direction between the first end face and the second end face, and can increase the boost ratio.

Here, the piezoelectric plate between the third primary side electrode and the fourth primary side electrode is polarized in the same direction as the polarization direction of the piezoelectric plate between the first primary side electrode and the second primary side electrode in the thickness direction. Four primary electrodes and the first primary electrode may be electrically connected, and the third primary electrode and the second primary electrode may be electrically connected, and the third primary electrode and the fourth primary electrode may be electrically connected. The piezoelectric plate between the secondary electrodes is polarized in the thickness direction opposite to the polarization direction of the piezoelectric plate between the first primary electrode and the second primary electrode, and the third primary electrode and the first primary electrode are It may be electrically connected, and the 4th primary side electrode and the 2nd primary side electrode may be electrically connected.

According to the present invention, there is provided a substantially rectangular piezoelectric plate having a first main surface and a second main surface facing the first main surface, wherein the one side of the first main surface of the piezoelectric plate extends. Has a first primary side region, a second primary side region, and a secondary side region in a first direction, and the first primary side region, the second primary side region, and the secondary side region are different from each other; The first primary side region has a length of approximately 1 / n (n is an integer of 2 or more) of the length of the first direction of the piezoelectric plate, and the first primary side region of the first primary side region. A first primary side electrode and a second primary side electrode are respectively disposed on the first main surface and the second main surface to face each other, and between the first primary electrode and the second primary side electrode is Polarized in the thickness direction of the piezoelectric plate, wherein the second primary side region is formed in the first A length of less than or equal to 1 / n of a length in a direction, and a third primary side electrode and a fourth one on the second main surface and the second main surface of the second primary side region of the piezoelectric plate. The secondary electrodes are provided to face each other, and the third primary electrode and the fourth primary electrode in the second primary region are disposed in a predetermined direction in the thickness direction of the piezoelectric plate. While being polarized, the third primary side electrode and the fourth primary side electrode, the first primary side electrode and the second primary side electrode are connected in a predetermined connection state. In the secondary region, the first secondary electrode and the second electrode which face each other in the second direction, the direction in which the other side of the first main surface perpendicular to the one side of the first main surface extends. A secondary electrode is provided, and at least the first secondary side electrode and the second secondary in the secondary side region. The piezoelectric transformer of claim 5 is provided between the electrodes is polarized in the direction of said one second.

In the fifth piezoelectric transformer of the present invention, the first main surface of the first primary side region having a length of approximately 1 / n (n is an integer of 2 or more) of the length in the first direction of the piezoelectric plate, and A first primary side electrode and a second primary side electrode are respectively provided on the second main surface so as to face each other, and a third main surface and a second main surface of the second primary side region of the piezoelectric plate are also provided. Since the primary side electrode and the fourth primary side electrode are provided to face each other, the area of the primary side electrode is larger and the input impedance of the piezoelectric transformer is smaller. As a result, electrical energy is easily supplied from the power supply to the piezoelectric transformer.

In addition, since the first primary region has a length of almost 1 / n of the piezoelectric plate, the first region has a length of half the wavelength of the stress distribution at resonance in the first direction of the piezoelectric plate and at the time of resonance. It becomes an area | region of the piezoelectric plate in which the stress in any one of positive or negative part generate | occur | produces in this 1st direction. In addition, since the second primary side region has a length equal to or less than 1 / n of the length in the first direction of the piezoelectric plate, the second primary side region has half the stress distribution at resonance in the first direction of the piezoelectric plate. It becomes the area | region which has a length below a wavelength and generate | occur | produces either a positive or negative stress in a 1st direction at the time of resonance. Then, the third primary side electrode and the fourth primary side electrode are provided on the first main surface and the second main surface of the second primary side region to face each other, so that the third primary side region of the second primary side region is provided. The third primary electrode, the fourth primary electrode, the first primary electrode, the first primary electrode, and the second electrode are polarized between the primary electrode and the fourth primary electrode in a predetermined direction in the thickness direction of the piezoelectric plate. The first and second primary side electrodes of the primary side region and the first primary side of the primary side region are electrically connected to each other in a predetermined connection state since the primary electrodes of It is possible to cause the second primary side region to vibrate so as to further increase the resonance excited by the region. As a result, the resonance is further increased by the second primary side region, so that the electrical energy of the input on the primary side is increased. It is efficiently converted into mechanical elastic energy.

By providing the second primary side region as described above, the input impedance of the piezoelectric transformer is reduced, and electrical energy is easily supplied from the power supply to the piezoelectric transformer, and the electrical energy of the input on the primary side can be converted into mechanical elastic energy more efficiently. By being able to convert, the effective step-up ratio of the piezoelectric transformer can be increased.

The fifth piezoelectric transformer of the present invention further has a secondary side region which is a region different from the first primary side region and the second primary side region in the first direction of the piezoelectric plate. A first secondary side electrode and a second secondary side electrode which are opposed to each other in a second direction in which the other side perpendicular to the one side of the main surface of the first direction extends are provided, and at least a first side of the secondary side region is provided. The gap between the secondary electrode and the second secondary electrode is polarized in the second direction. Thus, the piezoelectric plate in the secondary side region is coupled in the second direction by combining the resonance and Poisson ratio in the first direction which is excited by the first primary side region and the second primary side region. Then, mechanical unevenness occurs in the second direction and a potential difference occurs in the polarization direction in the second direction, which can be taken out by the first and second secondary electrode.

In this way, since the first and second secondary electrodes are provided so as to face each other in the second direction, the first and second secondary electrodes extend in a first length to a predetermined length. It can extend so that the node of the vibration of a direction may be included. Therefore, the lead line or lead frame from the secondary electrode can be pulled out from the node of the vibration in the first direction of the first and second secondary electrodes, respectively. The electrical connection and mechanical support of the secondary side can be facilitated without disturbing the vibration in the direction of, so that the output of the piezoelectric transformer is stable and casing is also easy.

Furthermore, since the first secondary electrode and the second secondary electrode in the secondary region do not have a ground potential in common with the primary electrode, the circuit on the primary side and the circuit on the secondary side can be separated directly. On the secondary side, an earth electrode independent of the primary side can be formed to insulate the earth on the primary side and the earth on the secondary side, and it is also possible to protrude without earthing the secondary side, thereby improving noise resistance.

Preferably, the first secondary electrode is provided at one end or one end of the piezoelectric plate in the second direction, and the second secondary electrode is located near the other end or the other end of the piezoelectric plate in the second direction. It is installed. In this way, almost all the charges generated in the secondary side region can be effectively taken out.

Further, the first secondary side electrode is provided on one of the third cross sections orthogonal to the second direction of the piezoelectric plate and the fourth cross section, and the second secondary electrode is placed on the third side of the piezoelectric plate. You may provide on another cross section among a cross section and a 4th cross section.

In addition, it is preferable that the first and second secondary side electrodes are provided together on either of the first main surface and the second main surface of the piezoelectric plate. In this manner, the secondary electrode can be formed simultaneously with the primary electrode in one film forming step. Moreover, since the connection with the lead or lead frame is made only on the first and second main surfaces, the shape of the lead or lead frame is simplified.

Further, the first secondary side electrode is provided on one of the first main surface and the second main surface of the piezoelectric plate so that the second secondary side electrode is different from the first main surface and the second main surface of the piezoelectric plate. It is good to install on the main surface. Even in this case, the secondary side electrode can be formed simultaneously with the primary side electrode in each film forming process for each main surface. Moreover, since the connection with the lead or lead frame is made only on the first and second main surfaces, the shape of the lead or lead frame is simplified.

In addition, when the lead wire or the lead frame, especially the lead frame, is pulled out from the position of the node of the piezoelectric transformer, electrical connection and mechanical support are simultaneously performed at the position of the node. In particular, in the present invention, since the first and second secondary side electrodes are provided to face each other in the second direction, these first and second secondary side electrodes extend in a first length to a predetermined length. It is possible to extend so that the node of the vibration of a 1st direction may be included. Therefore, the lead wire and the lead frame can be taken out from the node of the vibration in the first direction of the first and second secondary electrodes from the secondary electrode, and as a result, the vibration in the first direction is inhibited. The electrical driving and mechanical support of the secondary side can be easily performed, and the output of the piezoelectric transformer is stabilized, and the casing is also easy.

In addition, the second primary side region is caused to vibrate further by the resonances excited by the first and second primary side electrodes of the first primary side region. If the direction of the stress is opposite to the direction of the stress generated in the first primary region at the time of resonance, the polarization direction between the third primary electrode and the fourth primary electrode in the second primary region is defined as the first In contrast to the polarization direction between the first primary electrode and the second primary electrode in the primary region, the third primary electrode and the first primary electrode are electrically connected, and the fourth primary electrode And the second primary side electrode are electrically connected.

In addition, the second primary region is generated in the second primary region during resonance to further oscillate the resonance excited by the first and second primary electrodes of the first primary region. When the direction of the stress is opposite to the direction of the stress generated in the first primary region at the time of resonance, preferably, polarization between the third primary electrode and the fourth primary electrode in the second primary region The direction is the same as the polarization direction between the first primary side electrode and the second primary side electrode in the first primary side region, and the third primary side electrode and the second primary side electrode are electrically connected. The fourth primary electrode and the first primary electrode may be electrically connected.

The second primary side region and the first primary side region in order to further oscillate the resonance excited by the first and second primary side electrodes of the first primary side region. Direction of stress generated in the first primary region at the time of resonance when the distance between the vehicle side region is at least 1 / n of the length in the longitudinal direction, and the direction of the stress generated in the second primary region at the time of resonance In this case, the polarization direction between the third primary side electrode and the fourth primary side electrode of the second primary side region is defined as the first primary side electrode and the second primary side electrode of the first primary side region. It is preferable that the third primary side electrode and the first primary side electrode are electrically connected to each other, and the fourth primary side electrode and the second primary side electrode are electrically connected to each other in the same polarization direction.

Further, a third secondary electrode is further disposed between the first and second secondary electrodes of the secondary region in a direction opposite to the first and second secondary electrodes in the second direction. Polarization is performed between the first secondary side electrode and the third secondary side electrode in the second direction, and between the second secondary side electrode and the third secondary side electrode in the secondary side region in the second direction. The secondary side electrode may be polarized in a direction opposite to the polarization direction between the third secondary electrode and the secondary side power may be extracted between the first and second secondary electrode and the third secondary electrode. .

Even in this case, the piezoelectric plate in the secondary side region is coupled in the second direction by combining the resonance and the Poisson ratio in the first direction excited by the first primary side region and the second primary side region. And mechanical distorting occurs in the second direction, so that a potential difference occurs in the polarization direction in the second direction, so that it can be pulled out between the first and second secondary electrodes and the third secondary electrode. .

Furthermore, in the secondary side region of the piezoelectric plate, a first secondary side electrode and a second secondary side electrode which are opposed to each other in the second direction are provided, and a third between the first and second secondary side electrodes is provided. Secondary side electrodes are further provided to face the first and second secondary side electrodes in the second direction, respectively, and the secondary side electric power between the first and second secondary side electrodes and the third secondary side electrode. Since the first secondary electrode and the second secondary electrode which are opposed to each other in the second direction are provided in the secondary region, the gap between the first secondary electrode and the second secondary electrode is provided. Compared with the case where the polarization is performed in one direction of the second direction, the distance between the electrodes on the secondary side is shortened and the electrode area is increased, so that the capacitance on the secondary side is increased and the output impedance is reduced. As described above, when the output impedance of the piezoelectric transformer decreases, the voltage applied to the load connected to the secondary side electrode of the piezoelectric transformer increases by that much and is driven by a low impedance load.

In this way, when polarizing the secondary side region by providing the third secondary side electrode between the first secondary side electrode and the second secondary side region, only the first and second secondary side electrodes are provided. Compared with the case where the first and second secondary electrodes are polarized in any one direction of the second direction, the distance between the electrodes on the secondary side is shorter, and the absolute voltage applied at the time of polarization becomes smaller. As a result, the countermeasure of high pressure becomes easy, and the power supply for polarization can also use a lower pressure thing.

Further, since the first, second and third secondary side electrodes are provided to face each other in the second direction, even in this case, the first, second and third secondary side electrodes are predetermined in the first direction. It is extended in length so that it can extend to include the node of vibration in the first direction. Therefore, the lead line and the lead frame from the secondary electrode can be pulled out from the node of the vibration in the first direction of the first, second and third secondary electrodes, respectively, and as a result, the vibration in the first direction is inhibited. The electrical connection and mechanical support of the secondary side can be easily performed, so that the output of the piezoelectric transformer is stable and the casing is also easy.

As described above, when the third secondary side electrode is provided, the third secondary side electrode is provided at the center portion in the second direction of the piezoelectric plate, and the first and second secondary side electrodes are arranged on the third side. It is preferable that the secondary electrodes are arranged symmetrically in the second direction.

In this way, the node of the vibration in the second direction of the piezoelectric plate becomes the center portion in the second direction of the piezoelectric plate, and the third secondary electrode is placed in this center portion in the second direction of the piezoelectric plate. Since it is provided, even if the support member of a secondary side area | region is connected to the 3rd secondary electrode, the vibration suppression of the piezoelectric transformer in the 2nd direction is suppressed, and as a result, the vibration suppression of the piezoelectric transformer in the 2nd direction is suppressed. Mechanical support on the secondary side can be provided, so that the output of the piezoelectric transformer is stable and the casing is also easy.

Further, the first to third secondary electrodes can be provided apart from the primary electrodes.

In this way, the circuit on the primary side and the circuit on the secondary side can be separated directly from each other, and earth electrodes independent of the primary side are formed on the secondary side, respectively, to form the earth and secondary sides of the primary side. It is possible to insulate the ground and to protrude without earthing the secondary side, thereby improving noise resistance.

Moreover, it is also possible to connect the secondary side electrode used as a ground side, and the primary side electrode used as a ground side among DC 1st thru | or 3rd secondary electrode directly.

In this way, the electrical connection for the grounding of the secondary side can be taken in common from the primary side, and there is no need to connect a lead frame or a lead wire for grounding to the secondary side. As a result, the inhibition of the vibration of the piezoelectric transformer due to the electrical connection for grounding the secondary side can be eliminated.

Further, the third secondary electrode is provided extending in the first direction including the node of the vibration in the first direction, and the third secondary electrode is provided at the center portion in the second direction of the piezoelectric plate. The first and second secondary electrodes are arranged symmetrically in the second direction with respect to the third secondary electrode, and the first and second secondary electrodes are used as the grounding electrodes on the secondary side. The first and second secondary electrodes and the primary electrode serving as the ground side may be connected directly.

In this way, by installing the third secondary electrode extending in the first direction including the node of the vibration in the first direction, the lead wire and the lead frame from the third secondary electrode are formed on the first side of the piezoelectric plate. It can be pulled out from the node of the vibration in the direction, and as a result, the electrical connection and mechanical support to the third secondary electrode are facilitated without disturbing the vibration in the first direction of the piezoelectric plate, so that the output of the piezoelectric transformer This is stable and the casing becomes easy.

In addition, a third secondary electrode is provided in the center portion of the piezoelectric plate in the second direction, and the first and second secondary electrodes are symmetrically disposed in the second direction with respect to the third secondary electrode. Therefore, the lead wire and the lead frame from the third secondary electrode can be pulled out from the portion of the node of the vibration in the second direction of the piezoelectric plate, and as a result, the vibration in the second direction of the piezoelectric plate is inhibited. Without this, electrical connection and mechanical support to the third secondary electrode are facilitated, so that the output of the piezoelectric transformer is stable and the casing is also easy.

Furthermore, the first and second secondary electrodes are used as the grounding electrodes on the secondary side, and the first and second secondary electrodes are connected to the primary side electrodes to be the ground side by direct current so as to take the secondary ground. Since the electrical connection can be taken in common from the primary side, there is no need to connect a lead frame or lead wire for grounding to the secondary side, and as a result, the interference of the piezoelectric transformer can be eliminated by the electrical connection for grounding the secondary side. .

In this case, the first and second secondary side electrodes and the primary side electrode serving as the ground side are preferably provided continuously on the first or second main surface.

In this way, in one film forming process, a direct current connection portion between the primary ground electrode, the first and second secondary electrodes, the primary ground electrode, and the first and second secondary electrodes can be simultaneously formed. have.

In the piezoelectric transformer in which the secondary side is polarized in the longitudinal direction, preferably, the secondary side electrode is electrically connected to one side of the secondary side electrode and the second secondary side electrode, or one side of the secondary side electrode and the third secondary side electrode. And a lead terminal for supporting a mechanically connected piezoelectric plate such that the lead terminal vibrates by bending in the longitudinal direction or the first direction according to the vibration in the longitudinal direction or the first direction of the piezoelectric plate. Equipped with.

It is also suppressed by the elastic structure that the lead terminal is electrically connected and mechanically supported by the lead terminal and the vibration of the piezoelectric plate in the longitudinal direction or the first direction is inhibited.

In addition, a lead terminal is provided for supporting piezoelectric plates electrically and mechanically connected to at least one of the first to third secondary electrodes, and the lead terminal is bent in the second direction according to the vibration in the second direction. It has an elastic structure that vibrates.

It is also suppressed by the elastic structure that the lead terminal is electrically connected and mechanically supported by the lead terminal and the vibration of the piezoelectric plate in the second direction is inhibited.

Specifically, the elastic structure portion is formed by bending the middle portion of the lead terminal.

More preferably, the elastic structure portion is formed by bending the middle portion of the lead terminal.

More preferably, the elastic structure portion is formed by processing an intermediate portion of the lead terminal in an annular shape.

The piezoelectric transformer of the present invention is suitably used as a piezoelectric transformer for cold cathode tube lighting.

The piezoelectric transformer of the present invention is suitably incorporated in an inverter.

In addition, the piezoelectric transformer of the present invention is suitably incorporated in a liquid crystal display.

Moreover, the piezoelectric transformer of the present invention is suitably used for deflection high voltage circuits of Braun tubes, high voltage generating circuits such as copiers, and fax machines.

Moreover, as a piezoelectric material used as a piezoelectric substrate in this invention, it is PZT system, for example. Or PbTiO _3, such as PbTiO ₃ based piezoelectric ceramics are used. Examples of PZT-based ceramics include PZT and Pb (Ni _1/3 Nb _2/3 ) O ₃ -Pb (Zn _1/3 Nb _2/3 ) O ₃ -PbTiO ₃ -PbZrO ₃ -based ceramics. have.

Moreover, Ag, Ag-Pd, etc. are mentioned as an electrode material used in this invention.

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

[First Embodiment]

As shown in FIG. 2 (a) and FIG. 2 (b), the primary electrode 22 is provided on the left side (primary side) half of the upper surface 12 of the rectangular piezoelectric ceramic substrate 10, and the primary side A primary side electrode 24 is also provided on the lower surface 14 of the piezoelectric ceramic substrate 10 facing the electrode 22, and the piezoelectric ceramic substrate 10 between the primary side electrode 22 and the primary side electrode 24 is provided. Silver is polarized in the thickness direction between the upper surface 12 and the lower surface 14.

On the upper surface 2 of the piezoelectric ceramic substrate 10, the piezoelectric ceramic substrate 10 is separated from the primary side end surface 16 from a position halfway from the primary side end surface 16 in the longitudinal direction of the piezoelectric ceramic substrate 10. The primary electrode 26 is provided up to a distance of 3/4 of the length in the longitudinal direction, and the primary electrode 28 is also disposed on the lower surface 14 of the piezoelectric ceramic substrate 10 facing the primary electrode 26. ) Is installed. The primary electrode 26 is provided away from the primary electrode 22, and the primary electrode 28 is provided away from the primary electrode 24. The piezoelectric ceramic substrate 10 between the primary electrode 26 and the primary electrode 28 is polarized in the thickness direction of the upper surface 12 and the lower surface 14. The polarization direction of the piezoelectric ceramic substrate between the primary electrode 22 and the primary electrode 24 and the piezoelectric ceramic substrate 10 between the primary electrode 26 and the primary electrode 28 are the same.

The secondary electrode 72 is provided on the secondary side surface 17 perpendicular to the upper surface 12 and the lower surface 14 so that the piezoelectric ceramic substrate between the primary electrodes 26 and 28 and the secondary electrode 72 ( 10) is polarized in the longitudinal direction.

One end of the power supply 200 is connected to the primary electrode 22 through the connecting portion 122, and is connected to the primary electrode 28 via the connecting portion 128. The other end of the power supply 200 is connected to the primary electrode 24 through the connection portion 124 and to the primary electrode 26 through the connection portion 126. The secondary electrode 72 is connected to one end of the load 400, and the other end of the load 400 is connected to the other end of the power source 200.

When a voltage is applied between the power supply 200 and the primary electrodes 22 and 24, the longitudinal vibration of the longitudinal direction is excited by the piezoelectric transverse effect of displacing the electric field in the thickness direction in the left half and perpendicularly to the polarization direction. The entire transformer 100 vibrates. In the piezoelectric trans device of this embodiment, the drive is driven in a resonance mode in which a stress distribution having a first wavelength exists between the primary side end face 16 and the secondary side end face 17. The voltage of the same frequency as the resonant frequency of the one wavelength mode is applied from the power supply 200. In this embodiment, support points are provided at locations away from the primary side end face 16 to the right of the 1/4 wavelength distance and at locations away from the secondary end face 17 to the left of the 1/4 wavelength. Since the primary end surface 16 and the secondary side end surface 17 of the piezoelectric ceramic substrate 10 are open together, the stress becomes zero at both ends in the longitudinal direction of the piezoelectric ceramic substrate 10 and the amplitude is maximized. In this embodiment, since the resonance is performed in one wavelength mode, the stress distribution and the amplitude distribution are as shown in Figs. 2 (c) and 2 (d), respectively.

In the present embodiment, the primary electrodes 26 and 28 are further provided in addition to the primary electrodes 22 and 24. Therefore, the electrode area of the primary side a is larger than that of the conventional piezoelectric trans device of FIG. 1, and the input impedance of the piezoelectric trans device 100 is smaller. As a result, electric energy is easily supplied from the power supply 200 to the piezoelectric transformer element 100.

The stress in the region where the primary side electrodes 22, 24 are provided is in the direction of the upper surface 12 of the piezoelectric ceramic substrate 10, whereas the stress in the region where the primary side electrodes 26, 28 are provided is the piezoelectric ceramic. It is a lower surface direction of the board | substrate 10, and a direction opposite to the stress of the area | region in which the primary side electrodes 22 and 24 are provided. The polarization direction of the piezoelectric ceramic substrate 10 between the primary electrode 26 and the primary electrode 28 is that of the piezoelectric ceramic substrate 10 between the primary electrode 22 and the primary electrode 24. Same as the polarization direction, but the direction of application of the electric field is the opposite direction. Therefore, when a voltage is applied between the primary electrodes 26 and 28 from the power source 200, the piezoelectric ceramic substrate 10 between the primary electrodes 26 and 28 is transferred from the power source 200 to the primary electrode 22. , 24) oscillates to further increase the excitation resonance by applying a voltage between them. As a result, the electrical energy supplied from the power source 200 on the primary side a is converted into mechanical elastic energy more efficiently.

On the other hand, by providing the primary electrodes 26 and 28, the region of the secondary side b becomes short in the longitudinal direction, and as a result, the output impedance becomes small. As described above, when the output impedance of the piezoelectric trans device 100 decreases, the voltage applied to the load 400 connected to the secondary electrode 72 of the piezoelectric trans device 100 increases.

In this way, the primary side electrodes 26 and 28 are provided in the region where the stress in the opposite direction to the stress in the region where the primary side electrodes 22 and 24 are provided, thereby forming the primary side electrode 26 and the primary side electrode 28. The polarization direction of the piezoelectric ceramic substrate 10 between and is the same as the polarization direction of the piezoelectric ceramic substrate 10 between the primary electrode 22 and the primary electrode 24, and the application direction of the electric field is reversed. As a result, the input impedance of the piezoelectric trans device 100 becomes small, so that the piezoelectric trans device 100 can be easily supplied as electrical energy from the power source 200, and the electrical energy of the input on the primary side a can be more efficiently mechanically elastic. It can be converted into energy, and furthermore, the output impedance is reduced, so that the voltage applied to the load 400 connected to the secondary side b of the piezoelectric trans device 100 becomes large, thereby increasing the effective step-up ratio of the piezoelectric trans device 100. Enlarge.

In addition, since the distance between the primary side electrode and the secondary side electrode is shortened by providing the primary side electrodes 26 and 28 as described in this embodiment, the distance between the primary side electrodes 26 and 28 and the secondary side electrode 72 is reduced. When the piezoelectric ceramic substrate 10 is polarized in the longitudinal direction, the absolute voltage to be applied at the time of polarization is lower than in the case of the conventional piezoelectric trans device of FIG. 1 in which the primary side electrodes 26 and 28 are not provided. Becomes smaller. As a result, the countermeasure of a high pressure becomes easy, and a polarization power supply can use a lower pressure.

Moreover, even when the load 400 connected to the secondary side b of a piezoelectric transformer is CFL, this invention works more effectively. The CFL 400 requires a high voltage of 1 kV or more at the start of discharge. Meanwhile, the boost ratio of the piezoelectric trans device 100 is proportional to Qm, which is a quality factor of the resonator. Before the start of discharge, the impedance of the CFL 400 is close to infinity, so that the boost ratio is proportional to the Qm of the piezoelectric trans device 100. Therefore, by providing the primary electrodes 26 and 28 as in the present embodiment, the distance between the primary electrode and the secondary electrode is shortened so that the boost ratio determined by the shape of the secondary side becomes small. Since the Qm of the resonator thereof contributes greatly to the boosting ratio, the boosting up to the voltage at which the discharge can be started becomes easy. When the discharge starts, the impedance of the CFL 400 decreases, but since the output impedance of the piezoelectric trans device 100 is reduced by providing the primary electrodes 26 and 28 as in the present embodiment, the CFL 400 is applied to the CFL 400 accordingly. The voltage to be increased can be increased.

In addition, if the primary electrodes 26 and 28 as in the present embodiment are provided, the output impedance can be adjusted not only in the boost ratio of the piezoelectric transformer element 100 but also by adjusting the sizes of the primary electrodes 26 and 28. This increases the degree of freedom of design.

In addition, in the present embodiment, since the nodes 202 and 204 of the vibration are used as the supporting points of the piezoelectric trans device 100, the inhibition of the vibration of the piezoelectric trans device 100 generated by supporting the piezoelectric trans device 100 can be extremely small. have. In the present embodiment, the connecting portions 122 and 124 of the primary side electrodes 22 and 24 and the electrode terminals provided at the connecting portions 122 and 124 are also provided in the node 202 of the vibration and the primary side electrode 26 is provided. And the electrode terminals provided in the connecting portions 126 and 128 and the connecting portions 126 and 128 of these, are also provided in the node 204 of the vibration, so that the vibration is not inhibited by the electrical connection portion.

In this embodiment, the length in the longitudinal direction is 20 mm from Pb (Ni _1/3 Nb _2/3 ) O ₃ -Pb (Zn _1/3 Nb _2/3 ) O ₃ -PbTiO ₃ -PbZrO ₃ -based ceramic fired body. A rectangular parallelepiped having a width of 5 mm and a thickness of 1 mm was cut out to be a piezoelectric ceramic substrate 10. Next, a silver electrode was applied to the upper surface 12 and the lower surface 14 of the piezoelectric ceramic substrate 10 by screen printing, and also to the secondary side surface 17 by peeling. . Subsequently, baking is performed at 600 ° C. in air, and primary electrodes 22 and 26 are provided on the upper surface 12 of the piezoelectric ceramic substrate 10, and the lower surface 14 of the piezoelectric ceramic substrate 10 is placed on the lower surface 14 of the piezoelectric ceramic substrate 10. The primary electrodes 24 and 28 were formed on the secondary end surface 17 of the piezoelectric ceramic substrate 10, respectively.

Subsequently, DC 2 kV was applied at 100 ° C. between the primary electrode 22 and the primary electrode 24 and between the primary electrode 26 and the primary electrode 28 at a temperature of 100 ° C. so that the primary electrode 22 and the primary electrode. Polarization treatment in the thickness direction of the piezoelectric ceramic substrate 10 between (24) and polarization treatment in the thickness direction of the piezoelectric ceramic substrate 10 between the primary electrode 26 and the primary electrode 28 were performed. . The primary side electrodes 26 and 28 are connected by connecting the primary side electrode 26 and the primary side electrode 28 to the DC high voltage power supply positive electrode and the secondary side electrode 72 to the DC high voltage power supply cathode, respectively, and applying 10 kV at 100 ° C. And the polarization treatment in the longitudinal direction of the piezoelectric ceramic substrate 10 between the secondary electrodes 72.

Thereafter, one end of the power supply 200 is connected to the primary electrode 22 through the connecting portion 122, the first electrode 28 is connected via the connecting portion 128, and the other end of the power supply 200 is connected to the connecting portion 122. It connected with the primary side power supply 24 through 124, and was connected with the primary side electrode 26 through the connection part 126. As shown in FIG. The secondary side electrode 72 was connected to one end of the CFL 400, and the other end of the CFL 400 was connected to the other end of the power supply 200. As CFL 400, the thing of length 22mm and diameter 2.6mm used for the notebook type personal computer of A4 was used.

In the nodes 202 and 204 of the vibration, the voltage of the CFL 400 and the input voltage to the piezoelectric trans device 100 are applied by applying a voltage of 160 kV from the power supply 200 while supporting the piezoelectric trans device 100. The relationship with was measured. The result is shown in FIG. 3 (see curve P). In FIG. 3, in the piezoelectric trans device 100 shown in FIG. 2, between the primary side electrodes 22 and 24 and the secondary side electrode 72 without providing the primary side electrodes 26 and 28. FIG. The piezoelectric ceramic substrate 10 is also shown for comparison by a piezoelectric trans element having polarized in the longitudinal direction (see curve Q). In the primary side piezoelectric did not install the electrodes 26 and 28 also after the transport to the CFL (90) 400 to obtain the 27,000cd / ㎡ but requires an input voltage of 66V _rms as the input voltage of 30V _rms In the embodiment The same brightness was obtained.

The lighting of the CFL 400 could be started by applying an input voltage of about 15 V _rms .

[2nd to 5th Example]

As shown in FIG. 4 (a), in the second embodiment, the primary electrodes 26 and 28 are enlarged so that the ends of the primary electrodes 26 and 28 on the secondary electrode 72 side. The point closer to the side of the secondary electrode 72 than the first embodiment is different from that of the first embodiment, but the difference is the same, and the manufacturing method is the same.

As shown in FIG. 4 (b), in the third embodiment, the primary electrodes 26 and 28 are made smaller so that the ends of the secondary electrode electrodes 72 of the primary electrodes 26 and 28 are removed. The point farther from the secondary electrode 72 side than in the first embodiment is different from that in the first embodiment, but the difference is the same, and the manufacturing method is the same.

As shown in FIG. 4 (c), in the fourth embodiment, the primary electrodes 26 and 28 are made smaller, and the ends of the primary electrodes 26 and 28 on the side of the secondary electrode 72 are different. The distance from the secondary side electrode 72 is the same as that of the first embodiment, but the end surface 16 side of the primary side electrodes 26 and 28 is separated from the primary side electrodes 22 and 24 than the first embodiment. Although the distance is different from the first embodiment, the difference is the same and the manufacturing method is the same.

As shown in Figs. 5 (a) to 5 (c), in the fifth embodiment, the end portions of the secondary electrode 72 side of the primary electrode 26 and 28 of the fourth embodiment are removed. The extension of the secondary electrode 72 side by a predetermined length from that of the fourth embodiment is different from that of the fourth embodiment, but the difference is the same, and the manufacturing method is the same. In this embodiment, the position and size of the primary electrodes 26 and 28 are set to a predetermined position and size, thereby making it easy to adjust the input impedance and the output impedance, and to draw the support point and lead wire of the vibrator.

Also in the second to fifth embodiments, the primary side electrodes 26 and 28 are provided in the region where the stress in the direction opposite to the stress in the region where the primary side electrodes 22 and 24 are provided. The polarization direction of the piezoelectric ceramic substrate 10 between the primary electrode 28 and the primary electrode 28 is the polarization direction of the piezoelectric ceramic substrate 10 between the primary electrode 22 and the primary electrode 24. Since the application direction of the electric field is reversed, the input impedance of the piezoelectric transelement 100 becomes small, so that the electric energy is easily supplied from the power supply 82 to the piezoelectric transelement 100, and the input electric is applied on the primary side a. The energy is converted into mechanical elastic energy more efficiently, and the output impedance becomes smaller, so that the voltage applied to the load 400 connected to the secondary side b of the piezoelectric trans device 100 becomes large, thus the piezoelectric trans device 100 The effective boosting ratio becomes large.

In the second embodiment, since the primary side electrodes 26 and 28 are enlarged, the electrode area of the primary side a is larger than that of the piezoelectric trans device 100 of the first embodiment, so that The impedance is small. As a result, electrical energy is easily supplied from the power supply 200 to the piezoelectric trans device 100. On the primary side a, the electrical energy supplied from the power source 200 can be converted into mechanical elastic energy more efficiently than in the first embodiment. In addition, since the ends of the primary electrodes 26 and 28 on the secondary electrode 72 side are closer to the secondary electrode 72 side than in the first embodiment, the area of the secondary side b becomes shorter in the longitudinal direction. As a result, the output impedance becomes smaller. As a result, the voltage applied to the load 400 connected to the secondary side b of the piezoelectric trans device 100 is increased, thereby increasing the substantial step-up ratio of the piezoelectric trans device 100.

In the third embodiment, the ends of the secondary side electrodes 72 of the primary side electrodes 26 and 28 are farther from the secondary side electrode 72 side than in the first embodiment, so that the voltage generated on the secondary side is increased. It is possible to increase the voltage raising ratio of the piezoelectric trans device 100.

[Sixth Embodiment]

As shown in FIG. 6 (a) and FIG. 6 (b), the primary electrode 32 is provided in the area 1/3 of the left side of the upper surface 12 of the rectangular piezoelectric ceramic substrate 10. The primary electrode 34 is also provided on the lower surface 14 of the piezoelectric ceramic substrate 10 opposite the primary electrode 32 so that the piezoelectric ceramic substrate between the primary electrode 32 and the primary electrode 34 ( 10 is polarized in the thickness direction between the upper surface 12 and the lower surface 14.

On the upper surface 12 of the piezoelectric ceramic substrate 10, the piezoelectric ceramic substrate 10 is separated from the primary side end surface 16 from a position separated by a distance of 1/3 of the longitudinal length of the piezoelectric ceramic substrate 10 from the primary side end surface 16. The primary electrode 36 is provided up to a distance of 2/3 of the length in the longitudinal direction thereof, and the primary electrode 38 is also disposed on the lower surface 14 of the piezoelectric ceramic substrate 10 to face the primary electrode 36. Is installed. The primary electrode 36 is provided away from the primary electrode 32, and the primary electrode 38 is provided away from the primary electrode 34. The piezoelectric ceramic substrate 10 between the primary electrode 36 and the primary electrode 38 is polarized in the thickness direction of the upper surface 12 and the lower surface 14.

On the upper surface 12 of the piezoelectric ceramic substrate 10, the piezoelectric ceramic substrate (from the primary side end surface 16) is located at a distance of 2/3 of the length in the longitudinal direction of the piezoelectric ceramic substrate 10 from the primary side end surface 16 ( The primary electrode 42 is provided up to a distance of 5/6 of the length in the longitudinal direction of 10, and is also disposed on the lower surface 14 of the piezoelectric ceramic substrate 10 to face the primary electrode 42. 44) is installed. The primary electrode 42 is provided away from the primary electrode 36, and the primary electrode 44 is provided away from the primary electrode 38. The piezoelectric ceramic substrate 10 between the primary side electrode 42 and the primary side electrode 44 is polarized in the thickness direction. Polarization direction of the piezoelectric ceramic substrate 10 between the primary electrode 32 and the primary electrode 34 and of the piezoelectric ceramic substrate 10 between the primary electrode 36 and the primary electrode 38. The polarization direction is the same as the polarization direction of the piezoelectric ceramic substrate 10 between the primary electrode 42 and the primary electrode 44. The secondary electrode 72 is provided on the secondary electrode 17 which is perpendicular to the upper surface 12 and the lower surface 14 so that the piezoelectric ceramic substrate between the primary electrodes 42 and 44 and the secondary electrode 72 ( 10) is polarized in the longitudinal direction.

One end of the power supply 200 is connected to the primary electrode 32 through the connecting portion 132, the primary electrode 38 is connected through the connecting portion 138, and the primary electrode 42 through the connecting portion 142. ) Is connected. The other end of the power source 200 is connected to the primary electrode 34 through the connecting portion 134, and is connected to the primary electrode 36 through the connecting portion 136, and is connected to the primary electrode 44 through the connecting portion 144. Connected. The secondary electrode 72 is connected to one end of the load 400 and the other end of the load 400 is connected to the other end of the power supply 200.

When a voltage is applied between the power supply 200 and the primary electrodes 32 and 34, an electric field is applied in the thickness of the left 1/3, and the longitudinal direction in the longitudinal direction is caused by a piezoelectric transverse effect that is displaced perpendicularly to the polarization direction. Vibration is excited and the whole of the piezoelectric trans device 100 vibrates.

In the piezoelectric trans device of the present embodiment, it is possible to drive in a resonance mode in which a stress distribution of 1.5 wavelengths exists between the primary electrode 16 and the secondary side end face 18. In this way, a voltage having the same frequency as the resonance frequency of the 1.5 wavelength mode is applied from the power supply 200. In this embodiment, a place away from the primary side end face 16 at a distance of 1/4 wavelength, a place away from the primary side end face 16 at a distance of 3/4 wavelength, and from a secondary end face 18 A support point was installed at the location 4 wavelengths to the left. Since the primary end face 16 and the secondary end face 17 of the piezoelectric ceramic substrate 10 are open together, the stress becomes zero at both ends in the longitudinal direction of the piezoelectric ceramic substrate 10 and the amplitude is maximized. In this embodiment, since the resonance is performed in the 1.5 wavelength mode, the stress distribution and the amplitude distribution are as shown in Figs. 6 (c) and 6 (d), respectively.

In the present embodiment, the electrode area of the primary side a is increased, and the input impedance of the piezoelectric transistor element 100 is reduced accordingly. As a result, electric energy is easily supplied from the power supply 200 to the piezoelectric trans device 100.

The stress in the region where the primary side electrodes 32, 34 are provided is in the direction of the upper surface 12 of the piezoelectric ceramic substrate 10, whereas the stress in the region where the primary side electrodes 36, 38 are provided is piezoelectric. The ceramic substrate 10 is in the lower surface direction and is opposite to the stress in the region in which the primary electrodes 32 and 34 are provided. The polarization direction of the piezoelectric ceramic substrate 10 between the primary electrode 36 and the primary electrode 38 is the polarization direction of the piezoelectric ceramic substrate 10 between the primary electrode 32 and the primary electrode 34. It is the same as the polarization direction, but the direction of applying the electric field is the opposite direction. Therefore, when a voltage is applied between the power source 200 and the primary side electrodes 36 and 38, the piezoelectric ceramic substrate 10 between the primary side electrodes 36 and 38 is transferred from the power source 200 to the primary side electrode 32,. The oscillation further increases the excitation resonance as a voltage is applied between 34 and 34).

In addition, the primary electrodes 42 and 44 likewise contribute to further increasing resonance, and as a result, the electrical energy supplied from the power supply 200 on the primary side a is converted into mechanical elastic energy more efficiently.

On the other hand, by providing the primary side electrodes 42 and 44, the region of the secondary side b becomes short in the longitudinal direction, and as a result, the output impedance becomes small. As described above, when the output impedance of the piezoelectric trans device 100 decreases, the voltage applied to the load 400 connected to the secondary electrode 72 of the piezoelectric trans device 100 increases.

In addition, since the distance between the primary electrode and the secondary electrode is shortened by providing the primary electrodes 42 and 44 as in the present embodiment, the piezoelectric ceramic between the primary electrodes 42 and 44 and the secondary electrode 72 is reduced. The absolute voltage applied when the substrate 10 is polarized in the longitudinal direction becomes small. As a result, the countermeasure of high pressure becomes easy, and the power supply for polarization can also use lower pressure.

In addition, in this embodiment, since the nodes 212, 214, and 216 of the vibration are used as the supporting points of the piezoelectric trans device 100, the inhibition of the vibration of the piezoelectric trans device 100 generated by supporting the piezoelectric trans device 100 is extremely small. You can do it.

In the present embodiment, the connecting portions 132 and 134 of the primary electrodes 32 and 34 and the electrode terminals provided at the connecting portions 132 and 134 are also provided in the node 212 of the vibration and the primary electrode 36 , And the electrode terminals provided at the connecting portions 136 and 138 of the wires and the connecting portions 136 and 138 thereof are also provided at the node 214 of the vibration, and the connecting portions 142 and 144 of the primary electrodes 42 and 44, and Since the electrode terminals provided at the connection portions 142 and 144 are also provided at the node 216 of vibration, the vibration is prevented from being inhibited by the electrical connection portion.

In addition, the manufacturing method of the piezoelectric trans device 100 of this embodiment is the same as that of 1st embodiment.

[Seventh and Eighth Embodiments]

As shown in Fig. 7 (a), in the seventh embodiment, the primary side electrodes 36 and 38 and the secondary side electrode 72 are not provided without the primary side electrodes 42 and 44 of the sixth embodiment. The polarization of the piezoelectric ceramic substrate 10 in the longitudinal direction in the extending direction of the upper surface 12 and the lower surface 14 is different from that in the sixth embodiment, and the other is the same, and the manufacturing method is the same. .

As shown in FIG. 7 (b), in the eighth embodiment, the primary side electrodes 36 and 38 of the seventh embodiment are made smaller so that the secondary side electrode 72 of the primary side electrodes 36 and 38 is smaller. The end point of the side is farther from the secondary electrode 72 side than the seventh embodiment is different from the seventh embodiment, the other is the same, and the manufacturing method is the same.

9th and 10th Example

8 is a perspective view of the piezoelectric transformer of the ninth embodiment. In the first embodiment, the secondary electrode 72 is provided on the secondary side surface 17 of the piezoelectric ceramic substrate 10. In the ninth embodiment, the secondary electrode 74 is the piezoelectric ceramic substrate 10. The secondary electrode 76 and the secondary electrode electrode 76 and the secondary electrode electrode 76 are electrically connected to the lower surface 14 of the piezoelectric ceramic substrate 10. The point of connection to one end of the load 400 is different from that of the first embodiment, the other points are the same, and the manufacturing method is the same.

9 is a perspective view of the piezoelectric transformer of the tenth embodiment. In the first embodiment, the secondary electrode 72 is provided on the secondary side surface 17 of the piezoelectric ceramic substrate 10. In the tenth embodiment, the secondary electrode 74 is the piezoelectric ceramic substrate 10. The second side electrode 74 is connected to one end of the load 400 by being installed on the upper surface 12 of the first embodiment, different from the first embodiment, the other is the same, and the manufacturing method is the same.

When the secondary side electrode 74 is provided on the upper surface 12 of the piezoelectric ceramic substrate 10, the secondary side electrode 74 can be formed in the same process as that of forming the primary side electrodes 22 and 26, When the secondary side electrode 76 is provided on the lower surface 14 of the piezoelectric ceramic substrate 10, the secondary side electrode 76 can be formed in the same process as the steps of forming the primary side electrodes 24 and 28. There is no need to provide a step of forming the secondary electrodes 74 and 76.

In addition, by adjusting the areas of the secondary electrodes 74 and 76, the distance from the primary electrodes 26 and 28 can be adjusted, and as a result, the impedance of the piezoelectric trans device 100 can be adjusted. On the other hand, the resonant frequency of the piezoelectric trans device 100 is determined by the length of the piezoelectric ceramic substrate 10 in the longitudinal direction. Thus, by forming the secondary side electrodes 74 and 76 on at least one of the upper surface 12 and the lower surface 14 of the piezoelectric ceramic substrate 10, the frequency of the resonance and the output impedance can be controlled independently. Further, in the case where the secondary side electrodes 74 and 76 are formed on both the upper surface 12 and the lower surface 14 of the piezoelectric ceramic substrate 10 as in the ninth embodiment, polarization in the longitudinal direction becomes easy.

[Eleventh Embodiment]

Referring to FIGS. 10 (a) to 10 (c), in the piezoelectric trans device 100 of the present embodiment, a part of the primary electrode 22 is electrically insulated from the primary electrode 22 and installed. One return electrode 23 is different from the first embodiment, the other points are the same, and the manufacturing method is the same.

In this way, a part of the primary electrode 22 is a feedback electrode 23 which is electrically insulated from the primary electrode 22, thereby using the feedback electrode 23 to form a piezoelectric trans element in the form of a minute signal. A signal for monitoring the vibration state of the device 100 can be picked up, and feedback can be applied to the piezoelectric trans device 100 by using this, so that the piezoelectric trans device 100 can be oscillated by itself.

This self-excited oscillation is preferably performed by connecting the abnormal circuit 286 and the amplifying circuit 284 to the feedback electrode 23 and applying the output of the amplifying circuit 284 to the primary electrodes 22 and 24. I can cause it. In addition, the abnormal circuit 286 here uses the same thing as a reactance circuit preferably.

[Twelfth Example]

As shown in FIGS. 11A and 11B, the primary electrode 322 is provided in the area of the left quarter of the upper surface 302 of the rectangular piezoelectric ceramic substrate 300. The primary electrode 324 is also provided on the bottom surface 304 of the piezoelectric ceramic substrate 300 to face the secondary electrode 322, and the piezoelectric ceramic substrate between the primary electrode 322 and the primary electrode 324 ( 300 is polarized in the thickness direction between the upper surface 302 and the lower surface 304.

On the upper surface 302 of the piezoelectric ceramic substrate 300, the piezoelectric ceramic is separated from the primary side end surface 306 from a position distant from the primary side end surface 306 by a quarter of the length in the longitudinal direction of the piezoelectric ceramic substrate 300. The primary electrode 326 is further provided to a position separated by 3/8 of the length in the longitudinal direction of the substrate 300, and the lower surface 304 of the piezoelectric ceramic substrate 300 is opposed to the primary electrode 326. ) Is further provided with a primary side electrode 328. The primary electrode 326 is provided away from the primary electrode 322, and the primary electrode 328 is provided away from the primary electrode 324. The piezoelectric ceramic substrate 300 between the primary electrode 326 and the primary electrode 328 is polarized in the thickness direction between the upper surface 302 and the lower surface 304.

A primary side electrode 422 is provided in an area of the right quarter of the upper surface 302 of the piezoelectric ceramic substrate 300, and also faces the lower surface 304 of the piezoelectric ceramic substrate 300 facing the primary side electrode 422. The primary electrode 424 is provided, and the piezoelectric ceramic substrate 300 between the primary electrode 422 and the primary electrode 424 has a thickness direction between the upper surface 302 and the lower surface 304. It is polarized.

The piezoelectric ceramic substrate 300 has a length of the piezoelectric ceramic substrate 300 from the primary side end surface 308 from a position separated by a distance 1/4 of the length in the longitudinal direction of the piezoelectric ceramic substrate 300 from the primary side end surface 308. The primary electrode 426 is further provided to a position separated by 3/8 of the length in the direction, and the primary electrode 428 also faces the lower surface 304 of the piezoelectric ceramic substrate 300 to face the primary electrode 426. ) Is installed. The primary electrode 426 is provided away from the primary electrode 422, and the primary electrode 428 is provided away from the primary electrode 424. The piezoelectric ceramic substrate 300 between the primary electrode 426 and the primary electrode 428 is polarized in the thickness direction between the upper surface 302 and the lower surface 304.

Polarization direction of the piezoelectric ceramic substrate 300 between the primary electrode 322 and the primary electrode 324 and piezoelectric ceramic substrate 300 between the primary electrode 326 and the primary electrode 328. The polarization direction is the same, and the polarization direction of the piezoelectric ceramic substrate 300 between the primary electrode 422 and the primary electrode 424 and between the primary electrode 426 and the primary electrode 428 Although the polarization direction of the piezoelectric ceramic substrate 300 is the same, the polarization direction of the piezoelectric ceramic substrate 300 between the primary electrode 322 and the primary electrode 324 and the primary electrode 422 and the primary electrode ( The polarization direction of the piezoelectric ceramic substrate 300 is opposite to that of 424, and the polarization direction of the piezoelectric ceramic substrate 300 between the primary electrode 326 and the primary electrode 328 and the primary electrode ( The polarization direction of the piezoelectric ceramic substrate 300 between 426 and the primary side electrode 428 is reversed.

On the upper surface 302 of the piezoelectric ceramic substrate 300, a secondary side electrode 374 is further provided at the center in the longitudinal direction of the piezoelectric ceramic substrate 300, and the piezoelectric ceramic substrate 300 faces the secondary side electrode 374. The secondary side electrode 376 is further provided on the bottom surface 304 of the. The piezoelectric ceramic substrate 300 between the primary electrodes 326 and 328 and the secondary electrodes 374 and 376 is polarized in the longitudinal direction in the extending direction of the upper surface 302 and the lower surface 304. The piezoelectric ceramic substrate 300 between the primary electrodes 426 and 428 and the secondary electrodes 374 and 376 is polarized in the longitudinal direction in the extending direction of the upper and lower surfaces 302 and 304. The polarization direction of the piezoelectric ceramic substrate 300 between the primary side electrodes 326 and 328 and the secondary side electrodes 374 and 376 and between the primary side electrodes 426 and 428 and the secondary side electrodes 374 and 376. The polarization direction of the piezoelectric ceramic substrate 300 therebetween is the same direction.

One end of the power supply 200 is connected to the primary electrode 322 through the connecting portion 522, is connected to the primary electrode 328 through the connecting portion 528, and the primary electrode 428 through the connecting portion 628. ) Is connected to the primary electrode 422 via the contact portion 622. The other end of the power supply 200 is connected to the primary electrode 324 through the connecting portion 524, and is connected to the primary electrode 326 through the connecting portion 526, and the primary electrode 426 through the connecting portion 626. It is connected with the primary side electrode 424 through the connection part 624.

The secondary side electrode 374 and the secondary side electrode 376 are electrically connected together and connected to one end of the load 400, and the other end of the load 400 is connected to the other end of the power supply 200. In the present embodiment, the eleventh (c) can be driven at two wavelengths as shown in the eleventh (d).

In this embodiment, a piezoelectric ceramic substrate 300 having a length of 40 mm, a width of 5 mm, and a thickness of 1 mm was used. This embodiment has a shape in which the piezoelectric transformer of the first embodiment is provided symmetrically about the secondary side electrodes 374 and 376, and the piezoelectric trans device of the first embodiment is mounted on the piezoelectric transformer 100. Compared to the case, since it can supply twice as much energy, there is an effect of further reducing the input voltage. In addition, in the first embodiment, the secondary electrode 72 is provided on the secondary end surface 17. In the present embodiment, the secondary electrode 374 is formed at the center of the upper surface 302 of the piezoelectric ceramic substrate 300. And a secondary side electrode 376 is provided in the center of the lower surface 304 of the piezoelectric ceramic substrate 300 to face the secondary side electrode 374.

In the present embodiment, since the nodes 222, 224, 226, and 228 of vibration are used as the supporting points of the piezoelectric trans device 100, the vibration of the piezoelectric trans device 100 generated by supporting the piezoelectric trans device 100 is suppressed. You can make it very small.

In addition, the manufacturing method of the piezoelectric trans device 100 of this embodiment is the same as that of 1st embodiment.

In this embodiment, the polarization between the primary electrodes 326 and 328 and between the 426 and 428 may be reversed to electrically lower all primary electrodes on the same main surface.

[Thirteenth Embodiment]

In the first embodiment, the piezoelectric transformer 100 shown in FIGS. 12 (a) and 12 (b) has polarization of a portion exceeding the left half wavelength in the primary side region in the left half wavelength region. This is the reverse of polarization. The electrode can be one electrode 52 or 54 after polarization treatment as in the twelfth (a) and twelfth (b).

In this embodiment, driving can be performed in one wavelength mode as shown in Figs. 12 (c) and 12 (d).

The primary electrodes 52 and 54 extend from the primary electrode 16 to the position 3/4 of the length in the longitudinal direction of the piezoelectric ceramic substrate 10 from the primary side end surface 16. As a result, the electrode area of the primary side c + d is larger than that of the conventional piezoelectric transformer shown in FIG. 1, and the input impedance of the piezoelectric transelement 100 is smaller. As a result, electrical energy is easily supplied from the power supply 200 to the piezoelectric trans device 100.

The stress in the region c is in the direction of the upper surface 12 of the piezoelectric ceramic substrate 10, whereas the stress in the region d is in the lower surface direction of the piezoelectric ceramic substrate 10 and opposite to the stress in the region c. The polarization direction of the region c is opposite to the polarization direction of the region d, but the direction of applying the electric field is the same. Therefore, when a voltage is applied between the power source 200 and the primary electrodes 52 and 54, the piezoelectric ceramic substrate 10 in the region d further increases the resonance excited by the voltage applied from the power source 200 to the region c. To vibrate. As a result, the electrical energy supplied from the power source 200 on the primary side c + d can be converted into mechanical elastic energy more efficiently.

On the other hand, by providing the region d, the region f on the secondary side is shortened in the longitudinal direction, and as a result, the output impedance is reduced. As described above, when the output impedance of the piezoelectric transformer 100 decreases, the voltage applied to the CFLs 200 and 400 connected to the secondary electrode 72 of the piezoelectric transformer 100 increases.

In the same manner as in the first embodiment, piezoelectric ceramic substrates of the same size were manufactured. As illustrated in FIG. 13, polarization electrodes 521 and 523 are disposed on the upper surface 12 of the piezoelectric ceramic substrate 10, and polarization electrodes 541 and 543 are disposed on the lower surface 14, and the secondary electrode 17 is disposed on the lower surface 14. Secondary electrodes 72 were formed, respectively.

Thereafter, the polarization electrode 541 and the polarization electrode 523 were connected to the polarization power supply positive electrode, and the polarization electrode 521 and the polarization electrode 543 were connected to the polarization power supply negative electrode, and were 100 ° C. Polarization in the thickness direction of the c region and the d region was performed by applying 2 kV in the silicon oil of. Thereafter, the polarization electrode 521 and the polarization electrode 523 are connected by a conductor to form a primary electrode 52, and the polarization electrode 541 and the polarization electrode 543 are connected to a conductor to form a primary side. It was set as the electrode 54. Then, the primary side electrode 52 and the primary side electrode 54 are connected to the polarization power supply positive electrode, and the secondary side electrode 72 is connected to the polarization power supply negative electrode, and 10 kV is applied in a 100 degreeC silicon oil to apply the region f. The polarization treatment in the longitudinal direction of was performed.

One end of the power supply 200 was connected to the primary electrode 52 through the connecting portion 152, and the other end of the power supply 200 was connected to the primary electrode 54 through the connecting portion 154. The secondary electrode 72 was connected to one end of the CFL serving as the load 400, and the other end of the CFL 400 was connected to the other side of the power supply 200. As the CFL 400, a length of 225 mm and a diameter of 2.6 mm used for the A4 notebook personal computer were used.

In the nodes 202 and 204 of the vibration, a voltage of 160 kV is applied from the power supply 200 while the piezoelectric trans device 100 is supported, and the luminance of the CFL and the input voltage to the piezoelectric trans device 100 are applied. The relationship was measured. The result is shown in FIG. 14 (see curve P '). In FIG. 14, in the piezoelectric trans device 100 shown in FIG. 2, between the primary side electrodes 22 and 24 and the secondary side electrode 72 without providing the primary side electrodes 26 and 28. FIG. The piezoelectric ceramic substrate 10 is also shown for comparison by a piezoelectric trans element having polarized in the longitudinal direction (see curve Q '). In piezoelectric transformers in which the secondary electrodes 26 and 28 are not provided in the second piezoelectric transducer 100, an input voltage of 66 V _rms is required to obtain 27,000 cd / m2 of luminance in the CFL 200 and 400. However, in the present embodiment, the same luminance was obtained with an input voltage of 30 V _rms .

In addition, lighting of the CFL 400 could be started by applying an input voltage of about 15 V _rms .

In the present embodiment, the region d in FIG. 12 (b) may be shorter or longer than 1/4 wavelength depending on the use of the piezoelectric transformer.

In the former case, since the end portions of the primary electrodes 52 and 54 on the secondary electrode 72 side are closer to the secondary electrode 72 side than in this embodiment, the secondary side f region becomes shorter in the longitudinal direction. The result is a smaller output impedance. As a result, the voltage applied to the CFL 400 connected to the secondary side f of the piezoelectric trans device 100 becomes large, so that the effective boosting ratio of the piezoelectric trans device 100 can be increased.

In the latter case, the ends of the secondary electrode side 72 of the primary electrodes 52 and 54 are separated from the secondary electrode 72 side than in the embodiment of FIG. 14, so that the voltage generated on the secondary side can be increased. Therefore, the boosting ratio of the piezoelectric trans device 100 can be made larger.

Fourteenth Example

15 (a) to 15 (d) show a fourteenth embodiment. In the sixth embodiment, the polarization directions of the three regions on the primary side are reversed in neighboring regions, and can be driven at 1.5 wavelengths as in the sixth embodiment. The effect has all the effects of the sixth embodiment. In addition, since the primary electrode can be pulled out by a pair of lines, it can be connected only by the vibration node.

In addition, the manufacturing method of the piezoelectric trans device 100 of this embodiment is the same as that of the thirteenth embodiment.

[Fifteenth and Sixteenth Embodiments]

As shown in Fig. 16 (a), in the fifteenth embodiment, the area e of the fourteenth embodiment is not provided, which is different from the fourteenth embodiment, the other points are the same, and the manufacturing method is the same.

As shown in FIG. 16 (b), in the sixteenth embodiment, the region d of the fifteenth embodiment is reduced, and the end portion of the region d on the secondary side electrode 72 side is smaller than that of the embodiment of FIG. Although the distance from 72 is different from the fifteenth embodiment, the differences are the same and the manufacturing method is the same. With such a structure, the output of the secondary side can be made larger.

After the polarization treatment, the divided electrodes may be connected by a conductor paste, or may be connected by a lead line and a node point as shown in FIG. 16 (a).

[Example 17]

As shown in Fig. 17 (a) and Fig. 17 (b), the primary electrode 322 is provided in the region of the left 1/3 of the upper surface 302 of the rectangular piezoelectric ceramic substrate 300, and the primary electrode A primary side electrode 324 is also provided on the bottom surface 304 of the piezoelectric ceramic substrate 300 to face the 322, and the piezoelectric ceramic substrate 300 between the primary side electrode 322 and the primary side electrode 324 is disposed. ) Is polarized in the thickness direction between the upper surface 302 and the lower surface 304.

On the upper surface 302 of the piezoelectric ceramic substrate 300, the piezoelectric ceramic substrate is separated from the primary end surface 306 by a distance of 1/3 of the length in the longitudinal direction of the piezoelectric ceramic substrate 300 from the primary end surface 306. The primary side electrode 326 is further provided to a position separated by 5/12 distance of the length in the longitudinal direction of the 300, and also faces the lower surface 304 of the piezoelectric ceramic substrate 300 to face the primary side electrode 326. The primary side electrode 328 is further provided. The primary electrode 326 is provided away from the primary electrode 322, and the primary electrode 328 is provided away from the primary electrode 324. The piezoelectric ceramic substrate 300 between the primary electrode 326 and the primary electrode 328 is polarized in the thickness direction thereof.

The primary axis electrode 422 is provided in an area of the right 1/3 of the upper surface 302 of the piezoelectric ceramic substrate 300, and also faces the lower surface 304 of the piezoelectric ceramic substrate 300 facing the primary electrode 422. The primary electrode 424 is provided, and the piezoelectric ceramic substrate 300 between the primary electrode 422 and the primary electrode 424 is polarized in the thickness direction thereof.

On the upper surface 302 of the piezoelectric ceramic substrate 300, the piezoelectric ceramic is separated from the primary end surface 308 from a position separated by a distance 1/3 of the length in the longitudinal direction of the piezoelectric ceramic substrate 300 from the primary end surface 308. The primary electrode 426 is further provided to a position separated by a distance of 5/12 in the longitudinal direction of the substrate 300, and the lower surface 304 of the piezoelectric ceramic substrate 300 is opposed to the primary electrode 426. In addition, the primary electrode 428 is further provided. The primary side electrode 426 is provided away from the primary side electrode 422, and the primary side electrode 428 is provided away from the primary side electrode 424. The piezoelectric ceramic substrate 300 between the primary electrode 426 and the primary electrode 428 is polarized in the thickness direction between the upper surface 302 and the lower surface 304.

The polarization direction of the piezoelectric ceramic substrate 300 between the primary electrode 322 and the primary electrode 324 and the piezoelectric ceramic substrate 300 between the primary electrode 326 and the primary electrode 328. ), The polarization direction of the piezoelectric ceramic substrate 300 between the primary electrode 422 and the primary electrode 424, and between the primary electrode 426 and the primary electrode 428 The piezoelectric ceramic substrate 300 has the same polarization direction.

On the upper surface 302 of the piezoelectric ceramic substrate 300, a secondary side electrode 374 is provided at the center of the piezoelectric ceramic substrate 300 in the longitudinal direction, and faces the secondary side electrode 374 of the piezoelectric ceramic substrate 300. The secondary side electrode 376 is also provided on the lower surface 304. The piezoelectric ceramic substrate 300 between the primary electrodes 326 and 328 and the secondary electrodes 374 and 376 is polarized in the longitudinal direction in the extending direction of the upper surface 302 and the lower surface 304. The piezoelectric ceramic substrate 300 between the primary electrodes 426 and 428 and the secondary electrodes 374 and 378 is polarized in the longitudinal direction. Polarization direction of the piezoelectric ceramic substrate 300 between the primary side electrodes 326 and 328 and the secondary axis electrodes 374 and 376 and between the primary side electrodes 426 and 428 and the secondary side electrodes 374 and 376. The polarization direction of the piezoelectric ceramic substrate 300 therebetween is the opposite direction.

One end of the power supply 200 is connected to the primary electrode 322 through the connecting portion 522, is connected to the primary electrode 328 through the connecting portion 528, and the primary electrode 428 through the connecting portion 628. ) Is connected to the primary electrode 422 through the connecting portion 622. The other end of the power source 200 is connected to the primary electrode 324 through the connecting portion 524, and connected to the primary electrode 326 through the connecting portion 526, and is connected to the primary electrode 426 through the connecting portion 626. It is connected with the primary side electrode 424 through the connection part 624. FIG.

The secondary side electrode 374 and the secondary side electrode 376 are electrically connected together and connected to one end of the load 400, and the other end of the load 400 is connected to the other end of the power source 200.

In this embodiment, it is possible to drive in the resonance mode in which the stress distribution of 1.5 wavelength exists between the primary end surface 306 and the primary end surface 308. The voltage of the same frequency as the resonant frequency of the 1.5 wavelength mode is applied from the power supply 200. Since both ends 306 and 308 of the piezoelectric ceramic substrate 300 are open together, stress is zero at both ends in the longitudinal direction of the piezoelectric ceramic substrate 300 to maximize the amplitude. In this embodiment, since the resonance is performed in the 1.5 wavelength mode, the stress distribution and the amplitude distribution are as shown in Figs. 17 (c) and 17 (d), respectively.

Since the stress, polarization direction, and electric field direction of the region where the primary side electrodes 322 and 324 are provided are the same in the stress, polarization direction, and electric field direction of the region where the primary side electrodes 422 and 424 are provided, the primary side electrode Both the vibrations that are excited by the application of a voltage from the power source 200 between 322 and 324 and the vibrations that are excited by the application of a voltage from the power source 200 between the primary side electrodes 422 and 424 further increase the vibrations. Vibrate.

The stress in the region where the primary side electrodes 326 and 328 are provided is opposite to the stress in the region where the primary side electrodes 322 and 324 are provided and the stress in the region where the primary side electrodes 422 and 424 are provided. Direction. The polarization direction of the region where the primary side electrodes 326 and 328 are provided is the polarization direction of the region where the primary side electrodes 322 and 324 are provided and the polarization direction of the region where the primary side electrodes 422 and 424 are provided. The direction in which the electric field is applied to the region in which the primary electrodes 326 and 328 are provided is the same direction as that of the primary electrode and the primary electrodes 422 and 424. Is opposite to the direction of applying the electric field to the area where Therefore, when a voltage is applied between the power supply 200 and the primary electrodes 326 and 328, the piezoelectric ceramic substrate 300 between the primary electrodes 326 and 328 is connected to the primary electrode 322 and 324. The oscillation is made to further increase the excitation oscillation by applying the voltage from the power supply 200 between the oscillation which is excited by the application of the voltage from the power supply 200 and the primary side power supplies 422 and 424.

The stress in the region where the primary side electrodes 426 and 428 are provided is different from the stress in the region where the primary side electrodes 322 and 324 are provided and the stress in the region where the primary side electrodes 422 and 424 are provided. In the opposite direction. The polarization direction of the region where the primary side electrodes 426 and 428 are provided is the polarization direction of the region where the primary side electrodes 322 and 324 are provided and the polarization of the region where the primary side electrodes 422 and 424 are provided. The direction in which the electric field is applied to the region in which the primary electrodes 426 and 428 are provided, but the direction in which the electric field is applied to the region in which the primary electrodes 322 and 324 are provided and the primary electrode ( The direction opposite to the application direction of the electric field to the area where 422 and 424 are provided. Therefore, when a voltage is applied between the power supply 82, 200 between the primary electrodes 426, 428, the piezoelectric ceramic substrate 300 between the primary electrodes 426, 428 is disposed between the primary electrodes 322, 324. The oscillation is made to further increase the excitation oscillation by applying the voltage from the power supply 200 between the vibration which is excited by the application of a voltage from the power supply 200 to the primary side electrodes 422 and 424.

Therefore, the electrical energy supplied from the power supply 200 to the primary sides a and a 'can be converted into mechanical elastic energy more efficiently.

In the present embodiment, in addition to the primary electrodes 322, 324, 422, and 424, the primary electrodes 326, 328, 426, and 428 are further provided, whereby the electrode areas of the primary a and a 'are increased. The input impedance of the piezoelectric trans element is small. As a result, electric energy is not easily supplied from the power supply 200 to the piezoelectric trans device 100.

Further, by providing the primary electrodes 326 and 328, the region of the secondary side b is shortened in the longitudinal direction, and by providing the primary side electrodes 426 and 428, the region of the secondary side b 'is shortened in the longitudinal direction. As a result, the output impedance of the piezoelectric transelement 100 becomes small. When the output impedance of the piezoelectric trans device 100 decreases, the voltage applied to the load 400 connected to the secondary electrodes 374 and 356 of the piezoelectric trans device 100 increases by that much.

Further, by providing the primary electrodes 326, 328, 426, and 428 as in this embodiment, the distance between the primary electrode and the secondary electrode is shortened, so that the primary electrodes 326, 328 and 2 When the piezoelectric ceramic substrate 300 between the secondary electrodes 374 and 376 is polarized in the longitudinal direction and the piezoelectric ceramic substrate between the primary electrodes 426 and 428 and the secondary electrodes 374 and 376 ( In the case of polarizing 300 in the longitudinal direction, the absolute voltage of the high voltage applied at the time of polarization becomes smaller than in the case where these primary side electrodes 326, 328, 426 and 428 are not provided. As a result, the countermeasure of high pressure becomes easy, and the power supply for polarization can also use a lower voltage power supply.

In addition, in the present embodiment, since the nodes 232, 234 and 236 of the vibration are used as the supporting points of the piezoelectric trans device 100, the vibration inhibition of the piezoelectric trans device 100 generated by supporting the piezoelectric trans device 100 can be reduced. have.

In addition, the manufacturing method of the piezoelectric trans device 100 of this embodiment is the same as that of 1st embodiment.

In addition, the polarization of the region sandwiched between the electrodes 326 and 328 is reversed, and the polarization of the region sandwiched between the electrodes 426 and 428 is reversed to connect the connection portions 526 and 626 to the lines of the connection portions 522 and 622 ( line), and the connection parts 528 and 628 may be connected to the lines of the connection parts 524 and 624. FIG.

[Example 18]

As shown in FIG. 18 (a), the piezoelectric ceramic substrates 730, 740, and 750 having the same size are stacked and integrated to form a piezoelectric ceramic substrate 700. As shown in FIG.

A primary electrode 742 is provided on the left side (primary side) half of the upper surface 712 of the piezoelectric ceramic laminated substrate 700, and is 1/3 of the thickness direction from the upper surface 712 of the piezoelectric ceramic laminated substrate 700. At the distance point, that is, at the boundary between the piezoelectric ceramic laminated substrate 730 and the piezoelectric ceramic substrate 740, the primary electrode 744 is provided in parallel and opposite to the primary electrode 742, and the piezoelectric ceramic laminated substrate 700 The primary side electrode 746 is parallel to the primary side electrode 742 at a point at a distance of 2/3 in the thickness direction from the upper surface 712 of the top surface 712, that is, between the piezoelectric ceramic substrate 740 and the piezoelectric ceramic substrate 750. In addition, the primary electrode 748 is also provided in parallel with the primary electrode 742 on the lower surface 714 of the piezoelectric ceramic multilayer substrate 700.

On the upper surface 712 of the piezoelectric ceramic laminated substrate 700, the piezoelectric element from the primary side end surface 716 is separated from the primary side end surface 716 by a distance of about half of the length of the piezoelectric ceramic laminated substrate 700 in the longitudinal direction. The primary electrode 752 is provided to a position separated by 3/4 of the length of the ceramic substrate 700 in the longitudinal direction, and is 1/3 of the thickness direction from the upper surface 712 of the piezoelectric ceramic laminated substrate 700. The primary side electrode 754 is provided in parallel with the primary side electrode 752 at the boundary between the piezoelectric ceramic substrate 730 and the piezoelectric ceramic substrate 740 and faces the piezoelectric ceramic laminated substrate ( The primary side electrode 756 is the primary side electrode 752 at a distance of 2/3 of the thickness direction from the upper surface 712 of the 700, that is, the boundary between the piezoelectric ceramic substrate 740 and the piezoelectric ceramic substrate 750. Parallel to and opposite to each other, and the primary electrode 758 is also formed on the lower surface 714 of the piezoelectric ceramic multilayer substrate 700. 2) parallel to and opposite to each other. The primary electrode 752 is provided away from the primary electrode 742, the primary electrode 754 is installed away from the primary electrode 744, and the primary electrode 756 is separated from the primary electrode 746. The primary electrode 758 is provided away from the primary electrode 748.

The primary electrodes 742, 744, 746, 748, 752, 754, 756, 758 extend in the width direction from one widthwise cross section of the piezoelectric ceramic laminate 700 to the other widthwise cross section, respectively. It is installed.

Between primary side electrode 742 and primary side electrode 744 Between primary side electrode 744 and primary side electrode 746, between primary side electrode 746 and primary side electrode 748, Between the primary electrode 752 and the primary electrode 754, between the primary electrode 754 and the primary electrode 756, and between the primary electrode 756 and the primary electrode 758 The piezoelectric ceramic laminated substrate 700 is polarized in the thickness direction. The polarization direction between the primary electrode 742 and the primary electrode 744 is opposite to the polarization direction between the primary electrode 744 and the primary electrode 746. It is the same as the polarization direction between the primary electrode 748, and is opposite to the polarization direction between the primary electrode 752 and the primary electrode 754, and the primary electrode 754 and the primary electrode 756 Is the same as the polarization direction between the first side electrode 756 and the primary side electrode 758.

Secondary electrodes 772 are provided on the secondary end surface 718 perpendicular to the upper and lower surfaces 712 and 714 and between the primary electrodes 752, 754, 756 and 758 and the secondary electrodes 772. The piezoelectric ceramic laminated substrate 700 is polarized in the longitudinal direction.

One end of the power supply 200 is connected to the primary electrode 742 through the connecting portion 842, is connected to the primary electrode 752 through the connecting portion 852, and the primary electrode 746 through the connecting portion 846. Is connected to the primary electrode 756 via a connecting portion 856. The other end of the power supply 200 is connected to the primary electrode 744 through the connection part 844, and is connected to the primary electrode 754 through the connection part 854, and the primary electrode 748 through the connection part 848. ) Is connected to the primary electrode 758 through a connection portion 858. The secondary electrode 772 is connected to one end of the load 400, and the other end of the load 400 is connected to the other end of the power source 200. In addition, the connecting portions 842, 844, 846, and 848 are provided in the vibration node 202, and the connecting portions 852, 854, 856 and 858 are provided in the vibration node 204.

As described above, in the stacked piezoelectric trans device 2000 of the present embodiment, the piezoelectric trans devices 130 and 140 of a single plate are stacked on a back plate, and the piezoelectric trans devices 140 and 150 of a single plate are stacked on a back plate. The corresponding primary side electrodes are connected in parallel.

In the stacked piezoelectric trans device 2000 according to the present embodiment, it is possible to drive in the resonance mode in which the stress distribution of the first wavelength between the primary side end face 716 and the secondary side end face 718 exists. The voltage of the same frequency as that of the resonance of the one wavelength mode is applied from the power supply 200. In the present embodiment, support points are provided at locations far to the right of the 1/4 wavelength from the primary end surface 716 and locations far to the left of the 1/4 wavelength from the secondary end surface 718.

Since the primary end surface 716 and the secondary side end surface 718 of the piezoelectric ceramic laminated substrate 700 are open together, the stress becomes zero at both ends in the longitudinal direction of the piezoelectric ceramic laminated substrate 700 to maximize the amplitude. In this embodiment, since the resonance is performed in one wavelength mode, the stress distribution and the amplitude distribution are as shown in Figs. 18 (b) and 18 (c), respectively.

The piezoelectric contact elements 130, 140, and 150 of the single plate exhibit the same operations and effects as those of the pressure contact transducers 100 of the thirteenth embodiment, respectively. It has the same effect and effect as the trans element 100.

In addition, in the stacked piezoelectric trans device 2000 of the present embodiment, the input current flows three times as much as the piezoelectric trans devices 130, 140, and 150 of the single plate, and therefore, when the input power is constant, the input voltage is 1/3. The voltage can be reduced. In addition, since the input current can be tripled, if the input voltage is made constant, the input power can be increased three times to drive high power. On the other hand, when the piezoelectric trans devices 130, 140, and 150 of the single plate are used, when the energy density increases due to the increase in power, the loss increases above the threshold value determined by the material, resulting in a decrease in efficiency. In order to avoid this, the laminated structure as described above can lower the energy density in the piezoelectric ceramics and thus increase the total input power level.

In addition, by integrating the plurality of piezoelectric transformers 130, 140, and 150 as described above, the vacuum modes of the plurality of piezoelectric transformers 130, 140, and 150 can be arranged in a single manner.

In addition, the stacked piezoelectric trans device 2000 of the present embodiment may be formed by adhering the piezoelectric trans devices 130, 140, and 150 of a single plate, or may be formed by sintering integrally.

19th Example

As shown in FIGS. 19 (a) to 19 (c), the primary electrode 61 is provided in the region of the left 2/3 of the upper surface 12 of the rectangular piezoelectric ceramic substrate 10, and 1 A primary side electrode 62 is also provided on the lower surface 14 of the piezoelectric ceramic substrate 10 facing the primary side electrode 61, and between the primary side electrode 61 and the primary side electrode 62 (primary side region). The piezoelectric ceramic substrate 10 of a) is polarized in the thickness direction between the upper surface 12 and the lower surface 14. However, the piezoelectric ceramic substrate 10 between the primary side end face 16 and the primary side end face 16 and the point of distance 1/3 of the length in the longitudinal direction of the piezoelectric ceramic substrate 10 (area g) is downward. And the length of the distance 1/3 of the length in the longitudinal direction of the piezoelectric ceramic substrate 10 from the primary side end face 16 and the length in the longitudinal direction of the piezoelectric ceramic substrate 10 from the primary end face 16. The piezoelectric ceramic substrate 10 in the region (area h) is upwardly polarized between the point of distance 3 and the polarization of the piezoelectric ceramic substrate 10 in the region g and the polarization of the piezoelectric ceramic substrate 10 in the region h. In the opposite direction.

Piezoelectric element between the secondary side end face 18 and the point of the distance of 2/3 length in the longitudinal direction of the piezoelectric ceramic board 10 from the primary side end face 16 of the piezoelectric ceramic substrate 10 (secondary side area b). The ceramic substrate 10 is polarized in the longitudinal direction which is the extending direction of the upper surface 12 and the lower surface 14. However, 5/6 of the length of the longitudinal direction of the piezoelectric ceramic substrate 10 from the primary side end face 16 and the distance of 2/3 of the length in the longitudinal direction of the piezoelectric ceramic board 10 from the primary side end face 16. The piezoelectric ceramic substrate 10 in the region (area i) is polarized to the left and is a point 5/6 of the length in the longitudinal direction of the piezoelectric ceramic substrate 10 from the primary side end face 16. And the piezoelectric ceramic substrate 10 between the secondary end surface 18 (region j) are polarized to the right, polarization of the piezoelectric ceramic substrate 10 of region i and polarization of the piezoelectric ceramic substrate 10 of region j. Are opposite to each other.

The secondary electrode 77 is perpendicular to the longitudinal direction of the piezoelectric ceramic substrate 10 on the upper surface 12 of the point 5/6 of the length in the longitudinal direction of the piezoelectric ceramic substrate 10 from the primary side end surface 16. It is provided over the full width of the phosphorus width direction. On the secondary end of the lower surface 14 of the piezoelectric ceramic substrate 10, the secondary electrode 78 is provided over the full width of the piezoelectric ceramic substrate 10 in the width direction.

One end of the power supply 200 is connected to the primary electrode 61 through the connecting portion 161, and the other end of the power supply 200 is connected to the primary electrode 62 through the connecting portion 162. The secondary electrode 78 is connected to the other end of the power supply 200 and the primary electrode 62 through the connection portion 178. The secondary electrode 77 is connected to one end of the load 400 through the connecting portion 177, and the other end of the load 400 is the secondary side electrode 78, the primary side electrode 62, and the other end of the power supply 200. Is connected to.

When a voltage is applied between the power supply 200 and the primary electrodes 61 and 62, an electric field is applied in the thickness direction in the region of the left 2/3 (primary region a), and the piezoelectric element is displaced in a direction perpendicular to the polarization direction. The longitudinal vibration in the longitudinal direction is excited by the lateral effect, and the whole of the piezoelectric trans device 100 vibrates. The piezoelectric trans device of this embodiment can be driven in a resonance mode in which a stress distribution of 1.5 wavelengths exists between the primary electrode 16 and the secondary side end surface 17. The voltage of the same frequency as the resonance frequency of the 1.5 wavelength mode is applied from the power supply 200. In the present embodiment, since the primary side end surface 16 and the secondary side end surface 17 of the piezoelectric ceramic substrate 10 are opened together, the stress is zero at both ends in the longitudinal direction of the piezoelectric ceramic substrate 10 and the amplitude is maximum. It becomes In this embodiment, since the resonance is performed in the 1.5 wavelength mode, the stress distribution and the amplitude distribution are as shown in Figs. 19 (d) and 19 (e), respectively.

When driven in such a 1.5 wavelength mode, the node of vibration is determined from the point (section 212) of the distance 1/6 from the primary side end surface of the piezoelectric ceramic substrate 10 and the primary side end surface 16 of the piezoelectric ceramic substrate 10. It becomes three places of the point (section 214) of the distance of 1/2 and the point (section 216) of the distance of 5/6 from the primary side end surface 16 of the piezoelectric ceramic substrate 10. FIG. In this embodiment, the connection parts 161 and 162 are provided in the node 212 of vibration, and the connection part 177 is provided in the node 216 of vibration.

In this embodiment, the secondary electrode 78 is provided at the right end of the secondary side of the piezoelectric ceramic substrate 10 to be connected to the ground electrode 62 on the primary side, and at the same time, the secondary side region b is connected to the center portion of the secondary side region b. Since the secondary electrode 77 is installed at the high voltage side, only the secondary electrode (not shown) is provided at the right end of the secondary side, and compared with the case where the entire secondary side region b is polarized in one direction to the right or to the left. Since the distance between the electrodes on the secondary side is 1/2 and the electrode area is doubled, the capacitance on the secondary side is quadrupled and the output impedance becomes 1/4. As described above, when the output impedance of the piezoelectric trans device 100 decreases, the voltage applied to the load 400 connected to the secondary electrode 77 of the piezoelectric trans device 100 increases by that much.

The stress is zero at both ends of the secondary side region b, and there is a half-wave stress distribution in the secondary side region b, the stresses are in the same direction in the secondary side region b, and the ground side on both sides of the secondary side region b. The primary electrode 62 on the ground side and the secondary electrode 78 on the ground side are respectively provided, and the secondary electrode 77 on the high pressure side is provided at the point of the mountain of the stress distribution in the center of the secondary side region b. Since both sides of the electrode 77 are polarized in opposite directions, the electric charges generated in the secondary side region b can be almost effectively picked up. Since the secondary side region b is targeted for the secondary electrode 77 in this manner, the frequency of the output is also in a single mode, so that the operation of the piezoelectric transformer element 100 is also stable.

In addition, in the case of polarizing the secondary side region b by providing the secondary side electrode 77 in the secondary side region b, the secondary side electrode (not shown) of the high voltage side is provided only at the right end of the secondary side. Compared with the case where the whole area b is polarized in one direction of the right or left direction, the distance between the electrodes on the secondary side is 1/2, so that the absolute voltage applied at the time of polarization becomes small. As a result, the countermeasure of high pressure becomes easy, and the power supply for polarization can also use lower pressure.

In addition, in the present embodiment, the primary electrode 62 on the ground side and the secondary electrode 78 on the ground side are provided on the same lower surface 14 of the piezoelectric ceramic substrate 10, and the secondary electrode on the high voltage side ( 77 is provided on the upper surface 12 of the piezoelectric ceramic substrate 10, so the possibility of a short circuit between the secondary electrode 77 on the high voltage side and the secondary electrode 78 and the primary electrode 62 on the ground side is reduced. It can be suppressed.

In this embodiment, the positions of the primary electrodes 61 and 62 are two-thirds of the length in the longitudinal direction of the piezoelectric ceramic substrate 10 from the primary end face 16 and from the primary end face 16. It extends to. Therefore, the electrode area of the primary side is increased, and the input impedance of the piezoelectric trans device 100 is reduced accordingly. As a result, electric energy is easily supplied from the power supply 200 to the piezoelectric trans device 100.

Further, the regions g and h are polarized in the reverse direction, receive an electric field in the same direction, and the direction of the stress is reverse, so that the oscillation is further increased. As a result, the electrical energy supplied from the power source 200 on the primary side can be converted into mechanical elastic energy more efficiently.

On the other hand, by providing the region h, the region b on the secondary side is shortened in the longitudinal direction by that amount, and as a result, the output impedance is reduced. As described above, when the output impedance of the piezoelectric trans device 100 decreases, the voltage applied to the load 400 connected to the secondary side of the piezoelectric trans device 100 increases.

In the case where the load 400 connected to the secondary side of the piezoelectric transformer element 100 is a CFL as in the present embodiment, the present invention works more effectively. The CFL 400 requires a high voltage of 1 kV or more at the start of discharge. On the other hand, the lift ratio of the piezoelectric trans device 100 is proportional to Qm, which is a quality factor of the resonator. Before the start of discharge, the impedance of the CFL 400 is close to infinity, so that the boosting ratio is proportional to the Qm of the piezoelectric trans device 100 itself, thereby increasing the boosting ratio. Therefore, even if the boost ratio determined in the shape of the secondary side is small by providing the secondary side electrodes 77 and 78 as in this embodiment, the Qm of the resonator itself contributes greatly to the boost ratio at the start of discharge as described above. This makes it easy to boost the voltage to the voltage at which the discharge starts. When the discharge is started, the impedance of the CFL 400 decreases, but since the output impedance of the piezoelectric trans device 100 is reduced by providing the secondary electrodes 77 and 78 as in the present embodiment, the CFL 400 is applied to the CFL 400 accordingly. The voltage to be increased can be increased.

In addition, in the present embodiment, since the nodes 212 and 216 of the vibration are used as the supporting points of the piezoelectric trans device 100, vibration reduction of the piezoelectric trans device 100 generated by supporting the piezoelectric trans device 100 can be made very small. . In this embodiment, the electrode terminals provided at the connection points 161 and 162 of the primary electrodes 61 and 62 and the contacts 161 and 162 thereof are also provided at the node 212 of the vibration and the secondary electrode ( The electrode terminal provided at the connection point 177 and the connection point 177 of 77 is also provided at the node 216 of vibration, and the place where the connection point 178 of the secondary side electrode 78 is provided is an open end. Since the flexible lead is connected to the point shift point 178, it can also prevent that vibration is inhibited by the electrical connection part.

Next, a method of manufacturing the piezoelectric trans device 100 of the present embodiment will be described with reference to FIGS. 20 (a) to 20 (d). 20 (a) to 20 (d) are sectional views showing part of the manufacturing process of the piezoelectric transformer 100 of the present embodiment in the order of stroke.

In the present embodiment, as shown in FIG. 20 (a), Pb (Ni _1/3 Nb _2/3 ) O ₃ -Pb (Zn _1/3 Nb _2/3 ) O ₃ -PbTiO ₃ -PbZrO ₃ system From the piezoelectric ceramic fired body, a rectangular parallelepiped having a length of 36 mm, a width of 7.6 mm, and a thickness of 1 mm was cut out to be a piezoelectric ceramic substrate 10. Next, silver electrodes were applied to the upper surface 12 and the lower surface 14 of the piezoelectric ceramic substrate 10 by screen printing. Thereafter, the substrate is baked at 600 ° C. in the air to form a primary electrode 611 on the upper surface 12 of the region g of the piezoelectric ceramic substrate 10, and a primary side on the lower surface 14 of the region g of the piezoelectric ceramic substrate 10. The electrode 621 is formed on the upper surface 12 of the region h of the piezoelectric ceramic substrate 10, and the primary electrode 613 is formed on the lower surface 14 of the region h of the piezoelectric ceramic substrate 10. The secondary electrode 77 is formed on the upper surface 12 of the central portion of the secondary region b of the piezoelectric ceramic substrate 10, and the secondary electrode 77 is formed on the lower surface 14 of the right end of the secondary region b of the piezoelectric ceramic substrate 10. Electrodes 78 were formed, respectively.

Thereafter, as shown in FIG. 20 (b), the primary side electrode 611 is connected to the positive electrode of the polarization high voltage DC power supply 281, and the primary side electrode 621 is polarized high voltage DC power supply 281. The primary side electrode 613 is connected to the negative electrode of the high voltage direct current power supply 282 for polarization, and the primary electrode 623 is connected to the positive electrode of the high voltage direct current power supply 282 for polarization. Polarization in the thickness direction of the g region and the h region was performed by applying 2 kV from the high voltage DC power supplies 281 and 282 in the silicone oil, respectively.

Thereafter, as shown in FIG. 20 (c), the primary side electrodes 611, 613, 621, 623 and the secondary side electrode 78 are connected to the negative electrode of the high voltage DC power supply 283 for polarization, and the secondary side. The electrode 77 was connected to the positive electrode of the high-voltage DC power supply 283, and 12 kV was applied in 100 degreeC silicone oil, and the polarization process of the secondary side area | region b was performed.

Thereafter, as shown in FIG. 20 (d), the primary electrodes 611 and 613 are connected by the conductive paste 633, and the primary side shown in FIGS. 28 (a) to 28 (c) is shown. The electrode 61 was used to connect the primary side electrodes 621 and 623 with the conductive paste 643 to form the primary side electrode 62 shown in FIGS. 19 (a) to 19 (c). Moreover, you may connect with a lead wire, without connecting with an electrically conductive paste.

Thereafter, as shown in FIGS. 19A to 19C, one end of the power supply 200 is connected to the primary electrode 61 through the connecting portion 161, and the other end of the power supply 200 is connected. Was connected to the primary side electrode 62 via the connecting portion 162. The secondary side electrode 78 is connected to the other end of the power supply 200 and the primary side electrode 62 through the connecting portion 178, and the secondary side electrode 77 is connected to the load of the CFL 400 through the connecting portion 177. The other end of the CFL 400 was connected to the other end of the secondary electrode 78, the primary electrode 62, and the power supply 200. As the CFL 400, 225 mm and 2.6 mm in diameter used for the A4 notebook personal computer were used. A piezoelectric trans device 100 and a CFL 400 are mounted, followed by a module of a liquid crystal display in which a shield plate is used.

A 135 kV voltage was applied from the power supply 200. In this embodiment, when the CFL 400 is assembled to a liquid crystal panel and a shield plate is attached, the luminance of the CFL 400 of 33.000 cd / m 2 is obtained at an input voltage of 29 V _rms . The lighting of the CFL 400 could be started by applying an input voltage of about 12 V _rms .

In the case of using a piezoelectric transformer in which the secondary electrode of the high voltage side is provided only at the right end of the secondary side of the piezoelectric ceramic substrate 10 and the whole secondary side region b is polarized in one direction of right or left in the longitudinal direction, Due to the stray capacitance between the high voltage wirings, it was not possible to apply sufficient voltage to the CFL 400 and the CFL 400 could not be turned on.

Example of 20

21 (a) to 21 (e) are views for explaining the piezoelectric transformer of this embodiment. In this case, the piezoelectric trans device 100 is supported by the lead frames 1061, 1062, and 1066. The lead frames 1061, 1062, and 1066 are supported by the support members 1101, 1103, and 1102, respectively. One end portion of the lead frame 1061 is fixed to the connecting portion 161 and connected to the primary electrode 61 by welding. One end portion of the lead frame 1062 is connected to the secondary side electrode 77 by welding to the connecting portion 177. One end portion of the lead frame 1066 is fixed to the connecting portion 161 and connected to the primary electrode 62 by welding. In addition, the secondary electrode 78 is connected to and fixed to the connecting portion 178 near one end of the lead frame 1067, and the other end of the lead frame 1067 is connected to the connecting electrode 167 by welding with the primary electrode 62. The connection is fixed.

One end of the power supply 200 is connected to the other end of the lead frame 1061 through the connecting portion 1361, and the other end of the power supply 200 is connected to the other end of the lead frame 1066 through the connecting portion 1366. One end of the load 400 is connected to the other end of the lead frame 1062 through the contact part 1362, and the other end of the load 400 is connected to the other end of the lead frame 1066 and the power supply 200 through the connection part 1366. Is connected to the other end of the

The node of vibration is a point (section 212) located at a distance 1/6 from the primary side end surface 16 of the piezoelectric ceramic substrate 10, and a half point distance from the end face 16 of the piezoelectric ceramic substrate 10. 214 and the connection portions 161 and 162 to the nodes 212 of vibration because they are three places of the points (section 216) 5/6 from the primary side end surface 16 of the piezoelectric ceramic substrate 10. Is installed in the node 216 of vibration. Therefore, the electric interference of the piezoelectric transelement 100 caused by the electrical connection to the piezoelectric transelement 100 or the support of the piezoelectric transelement 100 can be made very small.

In addition, the secondary electrode 78 is connected to the lead frame 1067 through the connection point 178, and the lead frame 1067 is connected to the primary electrode 62 through the connection point 167. Since the 178 and the connection point 167 are vibration sites of the same phase, the lead frame 1067 may be connected to the lead electrode 1067 by connecting the secondary electrode 78 and the primary electrode 62 through these connection portions 178 and 167. The stiffness does not suppress vibration.

In the twentieth embodiment, a thickness of 0.15 mm and a width of 0.5 to 0.8 mm were used for the lead frames 1061, 1062, 1066, and 1067. Materials include iron-Ni alloys, phosphor bronzes, and the like.

[Example 21]

22 is a cross-sectional view for explaining the piezoelectric trans device of the twenty-first embodiment of the present invention.

In the present embodiment, the load is two, the secondary side electrode 79 is connected to one end of the load 402, the secondary side electrode 81 is connected to the other end of the load 402, and the secondary side electrode 80 ) Is connected to one end of the load 403, and the secondary electrode 82 is connected to the other end of the load 403 to independently load the upper and lower surfaces 12 and 14 of the piezoelectric ceramic substrate 10. It is running independently. The secondary side electrodes 79-82 are provided over the full width of the piezoelectric ceramic substrate 10 in the width direction.

On the secondary side, the primary side and the ground potential do not need to be common, so it is possible to separate the circuit on the primary side and the circuit on the secondary side directly, and to form the earth electrode independent of the primary side on the secondary side, respectively. It is also possible to insulate the ground and the earth on the secondary side, and to protrude without earthing the secondary side, and the noise resistance is also improved.

[22nd Example]

23 (a) to 23 (d) are views for explaining the piezoelectric trans device of the twenty-second embodiment of the present invention.

In the twenty-first embodiment described above, the entire secondary side region b is polarized in only one direction in the longitudinal direction of the piezoelectric ceramic substrate 10, and the secondary electrodes 79 and 81 are respectively provided on both sides of the load 402. The load 402 is connected to drive the load 403, and the secondary electrodes 80 and 82 are connected to both sides of the load 403 to drive the load 403. However, in the present embodiment, the piezoelectric ceramic substrate 10 The upper surface 12 and the lower surface 14 of the distance position 1/6 of the longitudinal length of the piezoelectric ceramic substrate 10 from the secondary side end surface 17 of the cross section) over the full width of the piezoelectric ceramic substrate 10 in the width direction. The secondary side electrode 91 and the secondary side electrode 92 are respectively provided so that the piezoelectric ceramic substrate (from the secondary side end surface 17 of the piezoelectric ceramic substrate 10 and the secondary side end surface 17 of the piezoelectric ceramic substrate 10 is formed). The piezoelectric ceramic substrate 10 is polarized to the left in the longitudinal direction of the piezoelectric ceramic substrate 10 to a distance position of 1/6 of the longitudinal length of 10). From the secondary side end surface 17 of the piezoelectric ceramic substrate 10 to the distance position 1/6 of the longitudinal length of the piezoelectric ceramic substrate 10, the piezoelectric body from the secondary side end surface 17 of the piezoelectric ceramic substrate 10. The piezoelectric ceramic substrate 10 to the distance position 1/3 of the longitudinal direction of the ceramic substrate 10 is polarized in the right direction in the longitudinal direction of the piezoelectric ceramic substrate 10, and the secondary electrode 91 is connected to the connection portion 191. The secondary side electrode 81 is connected to one end of the load 408 through the connection portion 179, and the secondary side electrode 81 is connected to the other end of the load 408 through the connection portion 179. Is connected to the other end of the load 408, the secondary electrode 92 is connected to one end of the load 409 via the connecting portion 192, and the secondary electrode 80 is connected to the load 409 through the connecting portion 180. The secondary electrode 82 is connected to the other end of the load 409 via the connecting portion 182 at the same time as the other end of the twenty-first embodiment. As in the twenty-first embodiment, on the secondary side, the primary side and the ground potential do not have to be common, and the circuit on the primary side and the circuit on the secondary side can be separated, and the earth electrode independent of the primary side on the secondary side. It is also possible to form and to insulate the earth of the primary side and the earth of the secondary side, and to protrude without earthing the secondary side, and the noise resistance is also improved.

In this embodiment, the secondary electrodes 79 and 81 are commonly connected to one output shaft, the secondary electrode 91 is to the other output side, and the secondary electrodes 80 and 82 are commonly connected to one side. The second side electrode 92 is used as the output side of the second side, and the output side of the second side electrode 92 is pulled out from between the secondary side electrodes 79 and 81 and the output side is taken out from the secondary side electrodes 80 and 82. In comparison with the embodiment of the present invention, since the distance between the electrodes on the secondary side is about 1/2, and the electrode area is doubled, the capacitance on the secondary side is about 4 times and the output impedance is about 1/4. As described above, when the output impedance of the output impedance element of the piezoelectric trans element is small, the voltage applied to the load connected to the secondary side electrode of the piezoelectric trans element 100 is increased by that much, so that the heavy load can be driven.

In addition, the secondary side electrode 91 is provided between the secondary side electrodes 79 and 81 and the secondary side electrode 924 is provided between the secondary side electrodes 80 and 82 to polarize the secondary side electrodes. In this case, only the secondary electrodes 79 and 81 are provided on the upper surface 12 of the secondary region, and the secondary electrodes 80 and 82 are provided on the lower surface 14 between the secondary electrodes 79 and 81. And the distance between the secondary electrodes is shorter than the case in which the secondary electrodes 80 and 82 are polarized in either the right or left direction in the longitudinal direction, so that the absolute voltage applied when polarizing is reduced. As a result, the countermeasure of high pressure is easy, and a polarization power supply can use a lower pressure.

In this embodiment, since the connection points 191 and 192 are provided at the nodes 216 of the longitudinal vibration of the piezoelectric ceramic substrate 10, the connection points 191 are supported on the secondary side of the piezoelectric transformer element 100. 912, the vibration suppression in the longitudinal direction of the piezoelectric transmissive yarn 100 can be reduced.

23rd Example

24 is a perspective view for explaining the piezoelectric transformer of the twenty-third embodiment of the present invention. This embodiment is applied to a piezoelectric trans device in which the secondary side region is polarized in the longitudinal direction.

In FIG. 24, the piezoelectric trans device 100 is supported by lead frames 1010, 1020 and 1430. In FIG. The lead frame 1010 is supported by the support member 1001, the lead frame 1020 is supported by the support member 1002, and the lead frame 1430 is supported by the support member 1003. The lead frames 1010 and 1020 are provided in a direction perpendicular to the longitudinal direction of the piezoelectric ceramic substrate 10, and the lead frame 1430 is provided in a direction parallel to the longitudinal direction of the piezoelectric ceramic substrate 10. .

The vicinity of one end of the lead frame 1010 is connected and fixed to the primary electrode 52 by welding to the connecting portion 152, and the vicinity of the other end of the lead frame 1010 is connected and fixed to the support member 1001. One end portion of the lead frame 102 is fixed to the connecting portion 154 by welding to the primary electrode 54, and the other end portion of the lead frame 1020 is fixed to the supporting member 1002. The connecting portions 152 and 154 are located at a quarter of the length in the longitudinal direction of the piezoelectric ceramic substrate 10 from the primary side end face 16 of the piezoelectric ceramic substrate 10, and the length of the piezoelectric ceramic substrate 10. It is provided in the center position of the width direction orthogonal to a direction.

In this way, the connecting portion 152 between the primary electrode 52 and the lead frame 1010 and the connecting portion 154 between the primary electrode 54 and the lead frame 102 are formed in the longitudinal direction of the piezoelectric ceramic substrate 10. Since it is provided in the vibration node 202, the vibration suppression in the longitudinal direction of the piezoelectric trans element 100 produced by connecting the lead terminal to the piezoelectric trans element 100 can be made very small.

The lead frame 1430 is a sub lead frame 1431-1434. The secondary lead frame 1431 is a linear lead frame extending in the longitudinal direction of the piezoelectric ceramic substrate 10, and one end portion of the secondary lead frame 1431 is near the one end portion by welding to the connecting portion 174 by the secondary electrode 74. The connection is fixed with. The connecting portion 174 is provided at the center portion in the width direction of the piezoelectric ceramic substrate 10. The sub lead frame 1432 is a linear lead frame extending in the longitudinal direction of the piezoelectric ceramic substrate 10, and one end portion of the sub lead frame 1432 is connected to and fixed to the support member 1003.

The sub lead frame 1433 extends from the other end of the sub lead frame 1431 in the width direction of the piezoelectric ceramic substrate 10 toward the cross section 18 in the width direction of the piezoelectric ceramic substrate 10, and the sub lead frame 1431. The lengthwise direction of the piezoelectric ceramic substrate from the width direction of the piezoelectric ceramic substrate 10 from the other end of the piezoelectric ceramic substrate 10 toward the widthwise end surface 18 of the piezoelectric ceramic substrate 10, and bend in the direction away from the piezoelectric ceramic substrate 10. have. The sub lead frame 1434 extends from the other end of the sub lead frame 1432 in the width direction of the piezoelectric ceramic substrate 10 toward the cross section 18 in the width direction of the piezoelectric ceramic substrate 10, and the sub lead frame 1432. The piezoelectric ceramic substrate 10 is closer to the piezoelectric ceramic substrate 10 in the longitudinal direction of the piezoelectric ceramic substrate 10 from the width direction of the piezoelectric ceramic substrate 10 as it faces from the other end of the piezoelectric ceramic substrate 10 in the width direction end face 18. It is bent in the direction, and the leading end of the sub lead frame 1433 and the sub lead frame 1434 are integrated, and the elastic structure part 1436 is comprised by the sub lead frame 1433 and the sub lead frame 1434.

The connecting portion 74 between the secondary electrode 74 and the lead frame 1430 is near the secondary side end surface 17 of the piezoelectric ceramic substrate 10, and is not present in the vibration node in the longitudinal direction of the piezoelectric ceramic substrate 10.

However, in the present embodiment, the lead frame 1430 is provided with an elastic structure portion 1434 so that the sub lead frames 1433 and 1434 are respectively around the point 1435 in accordance with the longitudinal vibration of the piezoelectric trans element 100. Bending occurs and vibrates. Therefore, vibration inhibition in the longitudinal direction of the piezoelectric trans device 100 is suppressed.

24th Example

25 is a perspective view for explaining the piezoelectric transformer of the twenty-fourth embodiment of the present invention. In the present embodiment, the connecting portion 174 between the secondary electrode 74 and the lead frame 1430 is near the secondary end surface 17 of the piezoelectric ceramic substrate 10, and the vibration in the longitudinal direction of the piezoelectric ceramic substrate 10 is performed. Although the lead frame 1440 has a sub lead frame 1443 extending in the width direction of the piezoelectric ceramic substrate 10, the sub lead frame 1443 in accordance with the longitudinal vibration of the piezoelectric transducer element 100. ) Bends around the point 1444 and vibrates. Therefore, vibration inhibition in the longitudinal direction of the piezoelectric trans device 100 is suppressed.

25th Example

26 is a perspective view for explaining a piezoelectric transformer of a twenty-fifth embodiment of the invention.

The connecting portion 174 of the secondary electrode 74 and the lead frame 1450 is near the secondary side end surface 17 of the piezoelectric ceramic substrate 10, and is not in the node of the longitudinal vibration of the piezoelectric ceramic substrate 10. In this embodiment, the lead frame 1450 is provided with an elastic structure portion 1456, respectively, around the point 1455 of the sub lead frames 1453 and 1454 in accordance with the longitudinal direction of the piezoelectric trans element 100. Bending occurs and vibrates. Therefore, vibration inhibition in the longitudinal direction of the piezoelectric trans device 100 is suppressed.

In the twenty-third to twenty-fifth embodiments, phosphor bronze is preferably used as the material of the lead frames 1430, 1440, and 1450, and the thickness is preferably 0.15 to 0.2 mm.

[Example 26]

As shown in FIG. 27 (a) and FIG. 27 (b), the primary electrode 32 is provided on the left third of the upper surface 12 of the rectangular piezoelectric ceramic substrate 10, and the primary electrode A primary side electrode 34 is also provided on the lower surface 14 of the piezoelectric ceramic substrate 10 opposite to the 32, and the piezoelectric ceramic substrate 10 between the primary electrode 32 and the primary side substrate 34 is disposed. ) Is polarized in the thickness direction between the upper surface 12 and the lower surface 14.

On the upper surface 12 of the piezoelectric ceramic substrate 10, the piezoelectric ceramic substrate is separated from the primary end surface 16 from a position one third of the length in the longitudinal direction of the piezoelectric ceramic substrate 10 from the primary side end surface 16. The primary electrode 36 is provided to a position separated by 2/3 distance of the length in the longitudinal direction of (10), and the primary side also faces the lower surface 14 of the piezoelectric ceramic substrate 10 facing the primary electrode 36. The electrode 38 is provided. The primary electrode 36 is provided away from the primary electrode 32, and the piezoelectric ceramic substrate 10 between the primary electrode 36 and the primary electrode 38 is polarized in the thickness direction thereof. The piezoelectric ceramic substrate 10 between the polarization direction of the piezoelectric ceramic substrate 10 between the primary electrode 32 and the primary electrode 34 and the primary electrode 36 and the primary electrode 38. The polarization direction of is the same.

The widthwise end surface 18 in the width direction perpendicular to the longitudinal direction of the piezoelectric ceramic substrate 10 has a length in the longitudinal direction of the piezoelectric ceramic substrate 10 from the secondary end surface 17 and the secondary end surface 17. The secondary side electrode 93 is provided to a position that is about a distance of about / 3, and the secondary side electrode 94 is also disposed in the cross section 19 of the piezoelectric ceramic substrate 10 in the widthwise direction opposite to the secondary side electrode 93. It is installed. The secondary side electrode 93 is provided away from the primary side electrodes 36 and 38 by a predetermined distance, and the secondary side electrode 94 is also provided away from the primary side electrodes 36 and 38 by a predetermined distance. have. The piezoelectric ceramic substrate 10 between the secondary side electrode 93 and the secondary side electrode 94 is polarized in the width direction between the secondary side end face 18 and the secondary side electrode 19.

One end of the power supply 200 is connected to the primary electrode 32 via the connecting portion 132, and is connected to the primary electrode 38 via the connecting portion 138. The other end of the power supply 200 is connected to the primary electrode 34 through the connection portion 134 and to the primary electrode 36 through the connection portion 136.

The secondary electrode 93 is connected to one end of the load 400 via the connecting portion 193, and the other end of the load 400 is connected to the secondary electrode 94 via the connecting portion 194.

When a voltage is applied between the power source 200 and the primary electrodes 32, 34, the electric field is applied in the thickness direction in the region of the left third, and the longitudinal direction is caused by the piezoelectric transverse effect displaced in the direction perpendicular to the polarization direction. Longitudinal vibration is excited to vibrate the entire piezoelectric trans device 100. In the piezoelectric transformer of the present embodiment, it is possible to drive in a resonance mode in which a stress distribution of 1.5 wavelength exists between the primary end face 16 and the secondary end face 17. The voltage of the same frequency as the resonance frequency of the 1.5 wavelength mode is applied from the power supply 200. In this embodiment, support points are provided at a place 212 separated to the right by a distance of 1/6 wavelength from the primary end face 16 and at a place 216 to a left of 1/6 wavelength left from the secondary end face 17. . Since the primary end face 16 and the secondary end face 17 of the piezoelectric ceramic substrate 10 are open together, the stress is zero at both ends in the longitudinal direction of the piezoelectric ceramic substrate 10, and the amplitude is maximized. In this embodiment, since the resonance is performed in the 1/5 wavelength mode, the stress distribution and the amplitude distribution are as shown in Figs. 27 (c) and 27 (d), respectively.

When driven in the 1.5 wavelength mode, the node of vibration is a point (node 212) at a distance of 1/6 from the primary end surface 16 of the piezoelectric ceramic substrate 10, and the primary end surface of the piezoelectric ceramic substrate 10 ( It becomes three places of the 5/6 point (section 216) from the point (section 214) of 1/2 distance from 16), and the primary end surface 16 of the piezoelectric ceramic substrate 10. As shown in FIG.

In this embodiment, the primary electrodes 36 and 38 are further provided in addition to the primary electrodes 32 and 34. Therefore, the electrode area of the primary side is enlarged, and the pressure impedance of the piezoelectric trans device 100 is reduced accordingly. As a result, electric energy is easily supplied from the power supply 200 to the piezoelectric trans device 100.

In addition, since the primary electrode is formed in two regions, when the voltage is applied from the power supply 200 to the primary electrode for the reasons described above, the piezoelectric ceramic substrate 10 between the primary electrodes 36 and 38 When the voltage is applied from the power supply 200 to the primary electrodes 32 and 34, the oscillation is further increased. As a result, the electrical energy supplied from the power supply 200 on the primary side can be converted into mechanical elastic energy more efficiently.

In this way, the primary side electrodes 36 and 38 are provided in the region where the stress in the direction opposite to that of the region where the primary side electrodes 32 and 34 are provided, and the primary side electrode 36 and the primary side electrode ( The polarization direction of the piezoelectric ceramic substrate 10 between the first and second electrodes 32 and 34 is the same as the polarization direction of the piezoelectric ceramic substrate 10 between the primary electrode 32 and the primary electrode 34. By conversely, the piezoelectric impedance of the piezoelectric trans device 100 is reduced, so that the electric energy can be easily supplied from the power supply 200 to the piezoelectric trans device 100, and the energy of the input on the primary side is more efficiently mechanical elastic energy. The effective step-up ratio of the piezoelectric trans device 100 can be increased by being able to be converted into.

In the present embodiment, the secondary side electrode 93 is further provided in the cross section 18 of the piezoelectric ceramic substrate 10 in the width direction, and the cross section of the piezoelectric ceramic substrate 10 in the width direction of the piezoelectric ceramic substrate 10. 19, a secondary side electrode 94 is further provided, so that the piezoelectric ceramic substrate 10 between the secondary side electrode 93 and the secondary side electrode 94 has a secondary side end face 18 and a secondary side end face 19. It is polarized in the width direction between and. Therefore, the piezoelectric ceramic substrate 10 between the secondary side electrode 93 and the secondary side electrode 94 is the piezoelectric ceramic substrate 10 and the primary side electrodes 36 and 38 between the primary side electrodes 32 and 34. Oscillation in the width direction combined with the resonance in the longitudinal direction and poisson ratio excited by the piezoelectric ceramic substrate (10) between the two, the potential difference occurs in the polarization direction in the width direction due to mechanical distortion in the width direction 2 It can be pulled out by the difference electrodes 93 and 94.

In this way, the secondary side electrode 91 and the secondary side electrode 94 are provided on the secondary side independently of the primary side electrodes 32, 34, 36, and 38, so that the circuits on the primary side and the secondary side It is possible to separate the circuits directly, and to form the earth electrodes independent of the primary side on the secondary side (for example, the primary side electrodes 34 and 36 and the secondary side electrode 93 are independent of each other). It is also possible to insulate the earth on the primary side and the earth on the secondary side, and to protrude without earthing the secondary side (for example, to protect the secondary side electrode 93 without earthing). It also improves noise.

In the present embodiment, on the secondary side, the lead wires and lead frames from the secondary side electrodes 93 and 94 can be drawn out from the portions of the vibrating nodes 216 in the longitudinal direction of the piezoelectric ceramic substrate 10, respectively. As a result, the electrical connection and the mechanical support of the secondary side can be easily performed without inhibiting the vibration in the longitudinal direction, so that the output of the piezoelectric trans device 100 is stabilized and the casing is also easy.

In addition, in this embodiment, since the nodes 212 and 214 of the vibration are used as the supporting points of the piezoelectric trans device 100, the vibration suppression of the piezoelectric trans device 100 generated by supporting the piezoelectric trans device 100 can be made very small. .

[Example 27]

FIG. 28 is a perspective view of the piezoelectric trans device of the embodiment of FIG. 27. FIG. In the twenty-sixth embodiment, the secondary side electrodes 93 and 94 are provided in the widthwise end surfaces 18 and 19 of the piezoelectric ceramic substrate 10, respectively. In the present embodiment, the secondary side electrodes 95 and 96 are provided. ), The secondary side end surface 17 so as to face each other in the width direction end face 18 and the width direction end face 19 side of the upper surface 12 of the piezoelectric ceramic substrate 10 in the width direction of the piezoelectric ceramic substrate 10. From the secondary side end surface 17 to a position separated by a distance of about 1/3 of the length in the longitudinal direction of the piezoelectric ceramic substrate 10 from the 26th embodiment, but other points are the same.

In the present embodiment, since the secondary electrodes 95 and 96 are provided together on the upper surface 12 of the piezoelectric ceramic substrate 10, the secondary electrodes 95 and 96 are formed by the same film forming process as the primary electrodes 32 and 36. ) Can be formed. Further, the connection with the lead or lead frame is made only on the upper surface 12 and the lower surface 14, and the shape of the lead or lead frame can be simplified.

28th Example

29 is a perspective view for explaining the piezoelectric trans device 100 of the present embodiment and the mounting method of the present embodiment.

The piezoelectric trans device 100 has the polarization direction of the piezoelectric trans device of the embodiment of FIG. 27 and the two regions on the primary side in opposite directions, so that the corresponding electrodes 61 and 62 are electrically integrated with each other. The other is the same.

The piezoelectric transelements 100 are supported by lead frames 1081, 1082, 1083 and 1084. The lead frames 1082 and 1083 are supported by the support member 1091, and the lead frames 1081 and 1084 are supported by the support member 1092. One end portion of the lead frame 1081 is fixed to the connecting portion 161 and connected to the primary electrode 61 by welding. One end of the lead frame 1082 is fixed to the connecting portion 162 by the primary electrode 62 by welding. One end of the lead frame 1083 is fixed to be connected to the secondary electrode 95 by welding to the connecting portion 195, and one end of the lead frame 1084 is welded to the connecting portion 196 by welding to the secondary side electrode ( 96) is fixed to the connection. The connecting portions 161 and 162 are provided at a central position in the width direction perpendicular to the longitudinal direction of the piezoelectric ceramic substrate 10 at a distance of 1/6 from the primary end surface 61 of the piezoelectric ceramic substrate 10. It is. The connecting portions 195 and 196 are provided at points 1/6 from the secondary end surface 17 of the piezoelectric ceramic substrate 10.

In the present embodiment, the connection section 161 of the primary side electrode 61 and the lead frame 1081 and the connection portion 162 of the primary side electrode 62 and the lead frame 1082 are subjected to vibration nodes 212. And the connecting portion 195 of the secondary electrode 95 and the lead frame 1083, and the connecting portion 196 of the secondary side electrode 96 and the lead frame 1084. In addition, since the lead frames 1081 to 1084 are thin and more spring-rich, vibration suppression of the piezoelectric trans device 100 generated by making an electrical connection to the piezoelectric trans device 100 or supporting the piezoelectric trans device 100 is prevented. Can be made very small.

Pb (Ni _1/3 Nb _2/3 ) O ₃ -Pb (Zn _1/3 Nb _2/3 ) O ₃ -PbTiO ₃ -PbZrO _3- based piezoelectric ceramic fired body 36 mm in length and 7 in width A rectangular parallelepiped having a size of 1 mm and a thickness of 1 mm was cut out to obtain a piezoelectric ceramic substrate 10. Next, using this piezoelectric ceramic substrate 10, the primary side was prepared as in the nineteenth embodiment. The secondary electrode 95 is provided in the longitudinal direction of the piezoelectric ceramic substrate 10 over the length of 10 mm from the secondary side end face 17 and the piezoelectric ceramic substrate 10 over the length of 1 mm from the widthwise end face 18. ) Inward in the width direction. The secondary electrode 96 is provided in the longitudinal direction of the piezoelectric ceramic substrate 10 over the length of 10 mm from the secondary side end face 17 and the piezoelectric ceramic substrate 10 over the length of 1 mm from the widthwise end surface 19. ) Inward in the width direction. The distance between the secondary electrode 95 and the secondary electrode 96 was 5 mm, and the length of the secondary electrode 95 and the secondary electrode 96 facing each other was 10 mm.

The secondary side electrode 95 is connected to the negative electrode of the high voltage direct current power supply (not shown) for polarization, and the secondary side electrode 96 is connected to the positive electrode of this high voltage direct current power supply, and 10 kV is applied in 100 degreeC silicone oil. The polarization treatment in the width direction of the secondary region b was thereby performed.

The piezoelectric trans device 100 was suspended by a lead wire and the impedance characteristics of the primary side and the secondary side were measured. The impedance characteristic of the primary side is shown in FIG. 30, and the impedance characteristic of the secondary side is shown in FIG.

Next, as shown in FIG. 29, the primary electrode 61 is connected to and fixed to the vicinity of one end of the lead frame 1081 by welding to the connection portion 161, and the primary electrode 62 is connected to the connection portion 162. FIG. Was fixed to the vicinity of one end of the lead frame 1082 by welding. The secondary electrode 95 is fixed to the connecting portion 195 near one end of the lead frame 1083, and the secondary electrode 96 is welded to the connecting portion 196 at one end of the lead frame 1084. Fixed connection with nearby.

In this state, the primary and secondary impedance characteristics were measured. Fig. 31 shows the impedance characteristic of the primary side. 33 shows impedance characteristics of the secondary side. Even in comparison with the impedance characteristics in the case where the piezoelectric transformer element 100 is suspended with the lead wires shown in Figs. 30 and 32, the level is practically ineffective even if the resonance impedance is somewhat increased. In addition, spurous is not observed and shows the outstanding characteristic.

Thereafter, one end of the power supply (not shown) is connected to the primary electrode 61 through the lead frame 1081 and the other end of the power supply (not shown) is connected to the primary electrode 62 through the lead frame 1082. Connected with The secondary electrode 95 is connected to one end of a load (not shown) through the lead frame 1083, and the other end of the load (not shown) is connected to the secondary electrode 96 through the lead frame 1084. did. As the load, a CFL having a length of 225 mm and a diameter of 2.6 mm used in an A4-type notebook personal computer was used.

A voltage of 130 mA was applied from a power supply (not shown). In this embodiment, a luminance of CFL of 30,000 cd / m 2 was obtained at an input voltage of 30 V _rms . The CFL could be turned on by applying an input voltage of about 18 V _rms .

29th Example

34 is a perspective view for explaining the piezoelectric transformer of the present invention.

The piezoelectric transelements 100 are supported by lead frames 1081, 1082, 1110 and 1210. The lead frames 1082 and 1110 are supported by the support member 1091, and the lead frames 1081 and 1210 are supported by the support member 1092. The lead frames 1081, 1082, 1110 and 1210 are provided in a direction perpendicular to the longitudinal direction of the piezoelectric ceramic substrate 10.

One end of the lead frame 1081 is a vibration node in the longitudinal direction, and is connected and fixed to the primary electrode 61 by welding to the connecting portion 161 which is a node of the vibration in the width direction, and the other end of the lead frame 1081. The vicinity is connected and fixed to the support member 1092. One end portion of the lead frame 1082 is fixed to the primary electrode 62 by welding to the connection portion 162 at a position opposite to the connection portion 161, and the other end portion of the lead frame 1082 is supported. It is connected and fixed to the member 1091. In this way, the connection points 161 and 162 are the nodes of the vibration in the longitudinal direction and the width direction, and thus the width direction of the piezoelectric trans device 100 generated by connecting the lead frames 1081 and 1082 on the primary side to the piezoelectric trans device 100. Vibration inhibition can be made very small.

The connecting portion 195 of the secondary electrode 95 and the lead frame 1110 and the connecting portion 196 of the secondary electrode 96 and the lead frame 1210 are vibrated in the longitudinal direction of the piezoelectric ceramic substrate 10. Since it is provided in the node 216, the vibration suppression in the longitudinal direction of the piezoelectric transelement 100 produced by connecting the lead frames 1110 and 1210 to the piezoelectric transelement 100 can be made very small.

On the other hand, the piezoelectric ceramic substrate 10 between the secondary electrode 95 and the secondary electrode 96 is polarized in the width direction of the piezoelectric ceramic substrate 10. Therefore, the piezoelectric ceramic substrate 10 between the secondary electrode 95 and the secondary electrode 96 is excited by the piezoelectric ceramic substrate 10 between the primary electrodes 61 and 62. Vibration in the width direction of the piezoelectric ceramic substrate 10 is coupled by the resonance in the longitudinal direction of the 10 and the Poisson's ratio. As a result, the vibration node in the width direction becomes the center portion in the width direction, and the contact portion 195 of the secondary side electrode 95 and the lead frame 1110 and the contact between the secondary side electrode 96 and the lead frame 1210 are in contact with each other. The baking part 196 is not in the node of the vibration of the width direction.

In the present embodiment, the lead frames 1110 and 1210 are provided with elastic structures 1120 and elastic structures 1220, respectively, and the sub lead frames 1113 and 1115 according to the vibration in the width direction of the piezoelectric trans element 11. ) Bends around the point 1117 and vibrates, and the sub lead frames 1114 and 1116 vibrate around the point 1118 and vibrates in the width direction, and the sub lead frames 1213 and 1215 Bending occurs around the silver point 1217 and vibrates, and sub lead frames 1214 and 1216 vibrate in the width direction, respectively, due to bending around the point 1218. Therefore, the vibration inhibition in the width direction of the piezoelectric trans device 100 is suppressed.

In addition, in the present embodiment, the lead frame of the secondary side electrode has an elastic structure portion, for example, a ring-shaped elastic structure portion 1220 composed of secondary lead frames 1216, 213 and 1215. May be a U-shaped elastic structure portion, for example, an elastic structure portion 1222 constituted by sub lead frames 1216 and 1218.

30th Example

35 is a perspective view for explaining the piezoelectric transformer of the thirtieth embodiment of the present invention.

In the present embodiment, the connecting portion 195 of the secondary electrode 95 and the lead frame 1140, and the connecting portion 196 of the secondary electrode 96 and the lead frame 1240 are formed at the node of the vibration in the width direction. However, since the lead frames 1140 and 1240 have secondary lead frames 1143 and 1242 respectively extending in the longitudinal direction of the piezoelectric ceramic substrate 10, the lead frames 1140 and 1240 are arranged in accordance with the vibration in the width direction of the piezoelectric transformer element 100. The frame 1143 vibrates due to bending around the point 1144, and the sub lead frame 1243 vibrates due to bending around the point 1244. Therefore, the vibration inhibition in the width direction of the piezoelectric trans device 100 is suppressed.

31st Embodiment

36 is a perspective view for explaining the piezoelectric transformer of the thirty-first embodiment of the present invention.

The connecting portion 195 of the secondary electrode 95 and the lead frame 1150 and the connecting portion 196 of the secondary electrode 96 and the lead frame 1250 are not in the node of vibration in the width direction. The lead frames 1150 and 1250 are provided with secondary lead frames 1153 and 1253 extending in the longitudinal direction of the piezoelectric ceramic substrate 10, so that the lead frames 1150 and 1250 may be mounted according to the vibration in the width direction of the piezoelectric trans device 100. The lead frame 1153 vibrates due to bending around the point 1154, and the sub lead frame 1253 vibrates due to bending around the point 1254. Therefore, the vibration inhibition in the width direction of the piezoelectric trans device 100 is suppressed.

In the 29th to 31st embodiments described above, the lead frames 1081, 1082, 1110, 1140, 1150, 1210, 1240, and 1250 can be easily processed by etching or pressing. As the material of the lead frames 1081, 1082, 1110, 1140, 1150, 1210 1240 and 1250, phosphor bronze is preferably used, and the thickness is preferably 0.15 to 0.2 mm.

32nd Embodiment

37 is a perspective view for explaining the piezoelectric transformer of the thirty-second embodiment of the present invention.

The connecting portion 195 of the secondary electrode 95 and the lead frame 1160 and the connecting portion 196 of the secondary side electrode 96 and the lead frame 1260 are not in the node of vibration in the width direction. However, the lead frames 1160 and 1260 have elastic structures 1169 and elastic structures 1269, respectively. The sub lead frames 1163 and 1164 are bent around the point 1165 due to the vibration in the width direction of the piezoelectric trans device 100, and the sub lead frames 1263 and 1264 vibrate around the point 1265. Bends on the device and vibrates. Therefore, the vibration inhibition in the width direction of the piezoelectric trans device 100 is suppressed.

As the material of the lead frames 1160 and 1260, an iron alloy or phosphor bronze is preferably used, and the thickness is preferably 0.15 to 0.2 mm.

The thirty-third to thirty-second embodiments indicate the same as those used in the twenty-eighth embodiment as the piezoelectric trans device 100, but the present invention is not limited thereto, but is applied to piezoelectric transformers in which the secondary side region is polarized in the width direction.

33rd Example

38 is a perspective view of the piezoelectric trans device of the thirty-third embodiment. The difference from the twenty-eighth embodiment shown in FIG. 29 is that the secondary electrodes 93 and 94 are moved from the secondary side end surface 17 to the widthwise end faces 18 and 19 of the piezoelectric ceramic substrate 10. The point is provided from the end face 17 to a position separated by a distance of about 1/3 of the length in the longitudinal direction of the piezoelectric ceramic substrate 10.

34th Example

39 (a) and 39 (b) are diagrams of the piezoelectric transistor element of the thirty-fourth embodiment. FIG. 39 (a) is a perspective view and FIG. 39 (b) is a sectional view.

Different from the twenty-eighth embodiment shown in FIG. 29, the secondary electrode 95 is formed from the secondary end surface 17 on the side of the widthwise end surface 18 of the upper surface 12 of the piezoelectric ceramic substrate 10. The secondary side electrode 97 is provided at a position separated by a distance less than 1/3 of the length in the longitudinal direction of the piezoelectric ceramic substrate 10 from the vehicle side end surface 17, and the lower surface 14 of the piezoelectric ceramic substrate 10 is disposed. Of the piezoelectric ceramic substrate 10 from the secondary end surface 17 and the secondary end surface 17 so as to face the secondary electrode 91 and the piezoelectric ceramic substrate 10 in the width direction thereof. It is installed up to a distance less than 1/3 of the length in the longitudinal direction.

In this embodiment, since the secondary electrode 95 is provided on the upper surface 12 of the piezoelectric ceramic substrate, the secondary electrode 95 can be formed by the same film forming process as the primary electrode 61, and the secondary electrode 95 is formed. Since the 97 is provided on the lower surface 14 of the piezoelectric ceramic substrate, the secondary side electrode 97 can be formed by the same film forming process as the primary side electrode 62. In addition, the connection with the lead or lead frame is made only on the upper surface 12 and the lower surface 14, so that the shape of the lead or lead frame can be simplified.

35th Example

40 (a) and 40 (b), the primary electrode 52 is provided in the region of the left 3/4 of the upper surface 12 of the rectangular piezoelectric ceramic substrate 10, A primary side electrode 54 is also provided on the lower surface 14 of the piezoelectric ceramic substrate 10 facing the primary side electrode 52, and between the primary side electrode 52 and the primary side electrode 54 (primary side region). The piezoelectric ceramic substrate 10 of a) is polarized in the thickness direction between the upper surface 12 and the lower surface 14. However, the piezoelectric ceramic substrate 10 between the primary end end face 16 and the primary end end face 16 at a distance 1/2 of the length in the longitudinal direction of the piezoelectric ceramic board 10 (area o) is downward. Of the distance of 1/2 of the length in the longitudinal direction of the piezoelectric ceramic substrate 10 from the primary end surface 16 and the length of the longitudinal direction of the piezoelectric ceramic substrate 10 from the primary end surface 16. The piezoelectric ceramic substrate 10 is polarized upward between the points at a distance of 3/4 (region p), and the polarization of the piezoelectric ceramic substrate 10 in region o and the polarization of the piezoelectric ceramic substrate 10 in region p It is opposite to each other.

Between the point 3/4 of the length in the longitudinal direction of the piezoelectric ceramic substrate 10 from the primary end surface 16 of the piezoelectric ceramic substrate 10 and the secondary end surface 17 (secondary region b). In the widthwise end face 18 and the widthwise end face 19 of the piezoelectric ceramic substrate 10, the secondary electrodes 98 and 99 are formed from the secondary end face 17 and from the secondary end face 17. Each of them is provided to a position separated by a distance of less than a quarter of the length in the longitudinal direction. The secondary electrode 98 is provided apart from the primary electrodes 52 and 54 by a predetermined distance, and the secondary electrode 99 is provided away from the primary electrodes 52 and 54 by a predetermined distance. The piezoelectric ceramic substrate 10 between the secondary electrode 98 and the secondary electrode 99 is polarized in the width direction of the piezoelectric ceramic substrate 10.

One end of the power supply 200 is connected to the primary electrode 52 through the connection portion 152, and the other end of the power supply 200 is connected to the primary electrode 54 through the connection portion 154.

The secondary electrode 98 is connected to one end of the load 400 via the connecting portion 198, and the other end of the load 400 is connected to the secondary electrode 99 via the connecting portion 199.

The 40th (c) can also be driven at a frequency such that the first wavelength mode is the same as that of the 40th (d). The point (node 202) and the place (section 204) three quarters from the primary end surface 16 of the piezoelectric ceramic substrate 10 are provided. In this embodiment, the connecting portions 152 and 154 are provided in the node 202 of vibration.

In this embodiment, the primary electrodes 52 and 54 are moved from the primary end face 16 to the position of a distance of 3/4 of the length in the longitudinal direction of the piezoelectric ceramic substrate 10 from the primary end face 16. It is extending. Therefore, the electrode area of the primary side is increased, and the impedance of the piezoelectric trans device 100 is reduced accordingly. As a result, electrical energy is easily supplied from the electric power 200 to the pressure element 100.

The stress in the region o is in the upper surface 12 direction of the piezoelectric ceramic substrate 10, whereas the stress in the region p is in the lower surface direction of the piezoelectric ceramic substrate 10 and is opposite to the stress in the region o. The polarization direction of the region o is opposite to the polarization direction of the region p, but the direction of application of the electric field is the same. Therefore, when a voltage is applied between the power source 200 and the primary electrodes 52 and 54, the piezoelectric ceramic substrate 10 in the region p may further increase the resonance which is excited by applying a voltage from the power supply 200 to the region o. Vibrate. As a result, the electrical energy supplied from the power supply 200 on the primary side can be converted into mechanical elastic energy more efficiently.

In this way, the secondary electrode 98 and the secondary electrode 99 are provided on the secondary side independently of the primary electrodes 52 and 54 so that the circuit on the primary side and the circuit on the secondary side are directly It is possible to separate them separately, so that each of the earth electrodes independent of the primary side is formed on the secondary side (for example, the primary side electrode 54 and the secondary side electrode 98 are independent of each other as the earth electrode), It is also possible to insulate the earth on the primary side and the earth on the secondary side, and to protrude without earthing the secondary side (for example, to protrude without earthing the secondary side electrode 98), thereby improving noise resistance.

Also in this embodiment, since the node 202 of vibration is used as the support point of the piezoelectric trans device 100, the vibration inhibition of the piezoelectric trans device 100 generated by supporting the piezoelectric trans device 100 can be reduced.

36th Example

As shown in FIG. 41 (a), a primary side electrode 61 is provided in the region 2/3 of the left side of the upper surface 12 of the piezoelectric ceramic substrate 10 on the rectangular parallelepiped, and is opposed to the primary side electrode 61. The primary electrode 62 is also provided on the lower surface 14 of the piezoelectric ceramic substrate 10, and the piezoelectric ceramic substrate 10 is disposed between the primary electrode 61 and the primary electrode 62 (primary region a). ) Is polarized in the thickness direction of the upper surface 12 and the lower surface 14. However, between the primary end surface 16 and the primary end surface 16, the piezoelectric ceramic substrate 10 between the points (distance k) of 1/3 of the length in the longitudinal direction of the piezoelectric ceramic substrate 10 is Polarized downward and having a distance 1/3 of the length in the longitudinal direction of the piezoelectric ceramic substrate 10 from the primary end surface 16 and the length in the longitudinal direction of the piezoelectric ceramic substrate 10 from the primary end surface 16. The piezoelectric ceramic substrate 10 in the region 1 is polarized upwardly between the two thirds of the points of the distance, and the polarization of the piezoelectric ceramic substrate 10 in the region k and the piezoelectric ceramic substrate 10 in the region 1 are polarized. Are opposite to each other.

Between the point 2/3 of the length in the longitudinal direction of the piezoelectric ceramic substrate 10 from the primary end surface 16 of the piezoelectric ceramic substrate 10 and the secondary end surface 17 (secondary region b). On the widthwise end face 18 side and the widthwise end face 19 side of the piezoelectric ceramic substrate 10 of the lower surface 14 of the piezoelectric ceramic substrate 10, secondary electrodes 64 and 65 are formed on the piezoelectric ceramic substrate 10. They are provided from the secondary end face 17 so as to face each other in the width direction from the secondary end face 17 to a position separated by a distance of a little less than a third of the length in the longitudinal direction of the piezoelectric ceramic substrate 10. The secondary electrodes 64 and 65 are provided apart from the primary electrode 62 by a predetermined distance.

Between the point 2/3 of the length in the longitudinal direction of the piezoelectric ceramic substrate 10 from the primary end surface 16 of the piezoelectric ceramic substrate 10 and the secondary end surface 17 (secondary region b). In the center portion in the width direction of the piezoelectric ceramic substrate 10 of the upper surface 12 of the piezoelectric ceramic substrate 10, the secondary electrode 63 is formed of the secondary electrode electrodes 64, 65 and the piezoelectric ceramic substrate 10. From the secondary side end surface 17, it is provided from the secondary side end surface 17 to the position separated from the secondary side end surface 17 so that the width direction 1/3 may be a little less than 1/3 of the length of the piezoelectric ceramic substrate 10 in the longitudinal direction. The secondary electrode 63 is provided a predetermined distance away from the primary electrode 61.

The length from the secondary side end surface 17 of the secondary side electrode 63 is equal to the length from the secondary side end surface 17 of the secondary side electrodes 64 and 65.

Between the secondary side electrode 64 and the secondary side electrode 63 is polarized in the width direction of the piezoelectric ceramic substrate 10, and between the secondary side electrode 65 and the secondary side electrode 63 in the width direction of the piezoelectric ceramic substrate. It is polarized in the direction opposite to the polarization direction between the secondary electrode 64 and the secondary electrode 63.

When a voltage is applied between the primary electrodes 61 and 62, an electric field is applied in the thickness direction in the region of the left 2/3 (primary region a), so that the piezoelectric transverse effect displaces in the direction perpendicular to the polarization direction. The vertical vibration of the excitation causes the entire piezoelectric trans device 100 to vibrate.

In the piezoelectric trans device 100 according to the present embodiment, driving is performed in a resonance mode in which a stress distribution having a wavelength of 1.5 exists between the primary end face 16 and the secondary end face 17. A voltage having a frequency equal to the resonance frequency of the 1.5 wavelength mode is applied between the primary electrodes 61 and 62. In this embodiment, since the primary side end face 16 and the secondary side end face 17 of the piezoelectric ceramic substrate 10 are open together, the stress is zero at both ends in the longitudinal direction of the piezoelectric ceramic substrate 10 and the amplitude is maximum. It becomes In this embodiment, the resonance can be made in the 1.5 wavelength mode. In this case, the stress distribution and the amplitude distribution are as shown in Figs. 41 (b) and 41 (c), respectively.

When driven in the 1.5 wavelength mode, the node of vibration is a point (node 212) at a distance of 1/6 from the primary end surface 16 of the piezoelectric ceramic substrate 10, and the primary end surface of the piezoelectric ceramic substrate 10 ( It becomes three places of the point (section 214) of 1/2 distance from 16), and the point (section 216) of 5/6 distance from the primary end surface 16 of the piezoelectric ceramic substrate 10. FIG. In this embodiment, the connection parts 161 and 162 are provided in the node 212 of vibration, and the connection part 263 is provided in the node 214 of vibration.

In the present embodiment, in the primary side region a, the primary side electrodes 61 and 62 are extended to the region l in which the stress in the direction opposite to that of the region k occurs, and the polarization direction of the region k is the same as the polarization direction of the region l. Alternatively, the impedance of the piezoelectric trans device 100 is reduced by making it the same as the direction in which the electric field is applied, and from a power source (not shown) connected to the piezoelectric trans device 100 between the primary side terminals 1201 and 1202. Since the electrical energy can be easily supplied and the electrical energy of the input can be more efficiently converted into elastic energy in the primary region a, the effective boosting ratio of the piezoelectric trans device 100 can be increased.

In addition, compared with the case where the secondary electrodes 64 and 65 are polarized in either of the width directions, the distance between the electrodes on the secondary side is 1/2 and the electrode area is doubled, so that the capacitance on the secondary side is 4 Doubled and reduced to 1/4 output impedance. As such, when the output impedance of the piezoelectric trans device 100 decreases, the voltage applied to the load connected between the secondary terminals 1301 and 1302 of the piezoelectric trans device 100 increases, thereby driving a low impedance load. do.

In addition, since the distance between the electrodes on the secondary side is short, the absolute voltage applied at the time of polarization becomes small. As a result, the countermeasure of high pressure is easy, and the power supply for polarization can also use lower pressure.

Next, with reference to FIG. 42, the manufacturing method of the piezoelectric transformer element 100 of this embodiment is demonstrated.

In this embodiment, the primary electrode 611 is provided on the upper surface 12 of the region of the piezoelectric ceramic substrate 10 by screen printing, and the primary electrode is formed on the lower surface 14 of the region k of the piezoelectric ceramic substrate 10. 621, the primary electrode 613 is disposed on the upper surface 12 of the region l of the piezoelectric ceramic substrate 10, and the primary electrode 623 is disposed on the lower surface 14 of the region d of the piezoelectric ceramic substrate 10. The secondary electrode 63 is disposed on the upper surface 12 of the secondary region b of the piezoelectric ceramic substrate 10, and the secondary electrodes 64 and 65 are formed on the lower surface 14 of the secondary region b of the piezoelectric ceramic substrate 10. Form each.

Thereafter, the primary side electrodes 611 and 621 are connected to a high voltage direct current power supply (not shown) for polarization, and the primary side electrodes 613 and 623 are connected to another high voltage direct current power supply (not shown) for polarization. Then, high voltage is applied from each of the high voltage direct current power supplies to polarize the thickness in the k region and the l region.

On the other hand, the secondary electrodes 64 and 65 are connected to one end of the high voltage direct current power supply (not shown) for polarization, and the secondary electrode 63 is connected to the other end of the high voltage direct current power supply (not shown) for polarization. Then, the polarization treatment in the width direction of the piezoelectric ceramic substrate 10 in the secondary region b is performed by applying a high voltage.

Thereafter, the primary side electrodes 611 and 613 are connected by the conductive paste 633 to form the primary side electrode 61 shown in FIG. 41 (a), and the primary side electrode by the conductive paste 643. Reference numerals 621 and 623 were connected to form the primary electrode 62 shown in FIG. 41 (a).

In the present embodiment, the primary electrodes 611 and 613 and 621 and 623 are connected by conductive paste, but may be electrically connected by lead wires as well as the conductive face.

37th Example

43 (a) -43 (e) are views for explaining the piezoelectric trans device of a thirty-seventh embodiment, FIG. 43 (a) is a top view, and 43 (b) is a bottom view, Fig. 43 (c) is a sectional view taken along the line XX of Fig. 43 (a), and Fig. 43 (d) is a diagram showing a stress distribution when driving at 1.5λ, and Fig. 43 (e) is a diagram showing an amplitude distribution.

In this way, since the common ground electrode 70 between the secondary electrodes 66 and 67 and the primary electrode 62 is provided on the lower surface 14 of the piezoelectric ceramic substrate 10, the secondary electrodes 66 and 67 are connected to the secondary electrodes 66 and 67. It is not necessary to make the electrical connection to the lead wire or the like from the outside. In addition, the secondary electrode 63 is connected to a lead frame (not shown) at the connecting portion 263.

In the present embodiment, the polarization direction of the two regions on the primary side is the reverse direction, but one region electrode may be connected to the electrode on the opposite side of the other region by making the polarization direction of the two regions of the primary side electrode the same.

Claims (24)

A piezoelectric substrate having a first main surface and a second main surface opposed to the first main surface described above, wherein one direction in which the first main surface and the second main surface extend is defined as the longitudinal direction of the piezoelectric plate. And the piezoelectric plate has at least a first region, a second region and a third region dividing the longitudinal direction, wherein the first region of the piezoelectric plate is one in the longitudinal direction of the piezoelectric plate. / n (n is an integer of 2 or more), and the first primary side electrode and the second primary side electrode face each other on the first main surface and the second main surface of the first region, respectively. And the first primary electrode and the second primary electrode of the first region are polarized in the thickness direction between the first main surface and the second main surface, and the first region Is in the second region of the piezoelectric plate spaced apart by a predetermined distance in the longitudinal direction. Secondary electrodes are provided, and the third region is provided between the first region and the second region, and has a length of 1 / n or less in the longitudinal direction of the piezoelectric plate, A third primary side electrode and a fourth primary side electrode are respectively provided on the first main surface and the second main surface of the third region so as to face each other, and the third primary side electrode of the third region is provided. And the fourth primary electrode are polarized in a predetermined direction in the thickness direction and at the same time, the third primary electrode, the fourth primary electrode, the first primary electrode and the second electrode A piezoelectric transformer having a high boosting ratio in which primary electrodes are electrically connected in a predetermined connection state, and the second region is polarized in the longitudinal direction. The polarization direction between the third primary side electrode and the fourth primary side electrode of the third region includes: the first primary side electrode and the second primary side of the first region; Same as the polarization direction between the electrodes, the third primary side electrode and the second primary side electrode are electrically connected, and the fourth primary side electrode and the first primary side electrode are electrically connected. Piezoelectric transformer with high boost ratio. The polarization direction between the third primary side electrode and the fourth primary side electrode of the third region includes: the first primary side electrode and the second one of the first region; The third primary side electrode and the first primary side electrode are electrically connected to each other, and the fourth primary side electrode and the second primary side electrode are electrically connected to each other in a direction opposite to the polarization direction between the secondary side electrodes. Piezoelectric transformer with high boosting ratio. The piezoelectric substrate of claim 1, further comprising a fifth region and a sixth region dividing the longitudinal direction, wherein the fifth region comprises: the first region relative to the second region; It is provided on the opposite side, the length in the longitudinal direction has a length of 1 / n, the seventh primary side electrode and the eighth primary side electrode on the first main surface and the second main surface of the fifth region; Respectively provided opposite to each other, and between the seventh primary side electrode and the eighth primary side electrode of the fifth region are polarized in a predetermined direction in the thickness direction, and the seventh primary side electrode and The eighth primary side electrode, the first primary side electrode and the second primary side electrode are electrically connected in a predetermined connection state, and the sixth region is the fifth region and the second region. Installed between the regions, having a length of less than or equal to 1 / n of the length in the longitudinal direction, A ninth primary side electrode and a tenth primary side electrode are disposed on the first main surface and the second main surface of the sixth region so as to face each other, and the ninth primary side electrode of the sixth region is provided. And the tenth primary side electrode are polarized in a predetermined direction in the thickness direction and at the same time, the ninth primary side electrode and the tenth primary side electrode light, the first primary side electrode and the second The primary side electrodes of are electrically connected in a predetermined connection state, the secondary side electrodes are provided on at least one of the first or second main surfaces, and the second regions on both sides of the secondary side electrodes A piezoelectric transformer with a high boost ratio that is polarized in the longitudinal direction. The said piezoelectric plate is a 1st cross section or a 2nd cross section orthogonal to the said longitudinal direction, The said 1st 2nd primary electrode is a said 1st cross section from the said 1st cross section. Extending in the longitudinal direction to a position of a distance of 1/2 the length of the distance between the cross section of the cross section and the second cross section, wherein the third and fourth primary electrodes are provided with the first and the second electrodes. Respectively disposed apart from the primary electrode 2 and the secondary electrode, the third region is polarized in the thickness direction in the same direction as the polarization direction of the first region, and the fourth primary electrode and the first electrode A piezoelectric transformer having a high boosting ratio in which a primary electrode of one is electrically connected, and wherein the third primary electrode and the second primary electrode are electrically connected. The said piezoelectric plate is a 1st cross section or a 2nd cross section orthogonal to the said longitudinal direction, The said 1st and 2nd primary electrode is a 1st cross section from a said 1st cross section. Extending in the longitudinal direction to a position of a distance 1/3 of the distance between the end face and the second end face, wherein the third and fourth primary side electrodes are formed from the first end face; 2 of the distance between the first cross section and the second cross section from the first cross section from the position of the distance 1/3 of the distance between the first cross section and the second cross section. Spaced apart from the first and second primary electrodes up to a distance of a length of less than or equal to 3, and extending in the longitudinal direction, respectively, wherein the third region is polarized in the first region in the thickness direction. Direction is polarized in the same direction, and the fourth primary electrode and the first primary side Pole is electrically connected to said third primary-side electrode and a high voltage step-up ratio of the piezoelectric transformer, which is the primary-side electrode of the second electrically connected to the. The piezoelectric plate according to claim 1, wherein the piezoelectric plate has a first cross section and a second cross section that are orthogonal to the longitudinal direction, and wherein the first and second primary side electrodes are formed of the first cross section from the first cross section. Each extending in the longitudinal direction to a distance position of a length of 1/2 of the distance between the end face and the second end face, wherein the third and fourth primary electrodes are separated from the secondary electrode. Each of the third regions is polarized in a direction opposite to the polarization direction of the first region in the thickness direction, and the third primary side electrode and the first primary side electrode are electrically connected; A piezoelectric transformer having a high boosting ratio in which the fourth primary side electrode and the second primary side electrode are electrically connected. The piezoelectric plate according to claim 1, wherein the piezoelectric plate has a first cross section and a second cross section that are orthogonal to the longitudinal direction, and wherein the first and second primary side electrodes are formed of the first cross section from the first cross section. Extending in the longitudinal direction to a position of a distance 1/3 of the distance between the end face and the second end face, wherein the third and fourth primary side electrodes are formed from the first end face; 2/3 of the distance between the first cross section and the second cross section from the first cross section from the position of the distance 1/3 of the distance between the first cross section and the second cross section. The first and second primary side electrodes and the secondary side electrodes are provided to extend in the longitudinal direction, respectively, to a position of a distance of the following length, and the third region extends the first region in the thickness direction. Polarized in a direction opposite to the polarization direction of the region, wherein the third primary electrode and A piezoelectric transformer having a high voltage raising ratio in which the first primary side electrode is electrically connected, and the fourth primary side electrode and the second primary side electrode are electrically connected. The piezoelectric plate according to claim 1, wherein the piezoelectric plate has a first cross section and a second cross section orthogonal to the longitudinal direction, and the first and second primary side electrodes of the piezoelectric plate are separated from the first cross section. The third and fourth primary electrodes provided in the longitudinal direction, respectively, extending in the longitudinal direction to a position of a length distance of 1/3 of the length in the longitudinal direction, are provided in the first section. From the position of the length distance 1/3 of the distance in the longitudinal direction of the piezoelectric plate from the first end face to the distance position of the length of 2/3 of the length in the longitudinal direction of the piezoelectric plate in the longitudinal direction Respectively, and the secondary side region is provided between the third region and the second cross section, and the third region is in the thickness direction and in a direction opposite to the polarization direction of the first region. Polarized, and the first primary side And the third primary side electrode are electrically connected to each other, the second primary side electrode and the fourth primary side electrode are electrically connected to each other, and the second secondary side region is formed at a seventh side of the second cross-sectional side. And the second region, wherein the secondary side electrode has the first main surface and the second main surface at a distance position of a length of 1/6 of the length direction of the piezoelectric plate from the second end surface. And a second two on at least one of the first main surface and the second main surface of the piezoelectric plate near the second end surface or on the second end surface of the longitudinal direction of the piezoelectric plate. The difference electrode is provided, and the seventh region is between the second end face and the distance position of the length of one sixth the distance in the longitudinal direction of the piezoelectric plate from the second end face, and the length Direction is polarized, and the said 2nd area | region is the said 2nd Is located between a position of a distance of 1/6 of the length in the longitudinal direction of the piezoelectric plate from a cross section of a position of a length distance of a distance 1/3 of the longitudinal direction of the piezoelectric plate from the second end face, A piezoelectric transformer having a high boosting ratio that is polarized in a direction opposite to the polarization direction and the longitudinal direction of the seventh region. The piezoelectric plate according to claim 1, wherein the piezoelectric plate has a first cross section and a second cross section orthogonal to the longitudinal direction, and the first and second primary side electrodes of the piezoelectric plate are separated from the first cross section. The third and fourth primary side electrodes provided in the longitudinal direction, respectively, extending in the longitudinal direction to a distance position of one third of the distance in the longitudinal direction, are provided in the first cross section. From the position of the length distance of 1/3 of the distance in the longitudinal direction of the piezoelectric plate from the first end face to the distance position of the length of 2/3 of the distance in the longitudinal direction of the piezoelectric plate, respectively Extends and is provided in the secondary region between the third region and the second cross section, and the third region is polarized in the same direction as the polarization direction of the first region in the thickness direction; , The first primary side war And the fourth primary side electrode are electrically connected to each other, the second primary side electrode and the third primary side electrode are electrically connected to each other, and the secondary side region includes a seventh side of the second cross-sectional side. An area of the first main surface and the second main surface at a distance position of a length of 1/6 of the distance in the longitudinal direction of the piezoelectric plate from the second end surface; A second secondary side provided at at least one side and at least one of the first main surface and the second main surface of the piezoelectric plate in the vicinity of the second end surface, or at the second end surface in the longitudinal direction of the piezoelectric plate; An electrode is provided, and the seventh region is between the second end face and the position of the length distance of 1/6 of the distance in the longitudinal direction of the piezoelectric plate from the second end face, and in the longitudinal direction. Polarized by the second region to the second region Between the position of the length distance of 1/6 of the distance in the longitudinal direction of the piezoelectric plate from the surface and the position of the length distance of 1/3 of the distance in the longitudinal direction of the piezoelectric plate from the second end face; And a piezoelectric transformer having a high boosting ratio which is polarized in a direction opposite to the polarization direction of said seventh region and said longitudinal direction. The said 2nd area | region is provided with at least the 3rd secondary side electrode which opposes the said secondary side electrode in the said longitudinal direction, The said secondary side electrode and the said 1st A piezoelectric transformer with a high voltage-ratio that allows the output to be drawn out between the secondary electrode of 3. The piezoelectric transformer according to any one of claims 1 to 10, wherein the piezoelectric transformer has a high boost ratio to draw an output between the secondary side electrode and the ground side of the third or fourth primary electrode. Substantially having a first main surface, a second main surface opposite to the first main surface, and a first cross section and a second cross section orthogonal to a first direction which is a direction in which one side of the first main surface extends A first and second primary electrode having a rectangular piezoelectric plate, wherein first and second primary electrodes are formed on the first main surface and the second main surface of the piezoelectric plate from the first end face and the second end face; Each of which extends in the first direction to a position of a length distance of 1/3 of the distance between the end faces, and third and fourth primary side electrodes are provided on the first main surface and the second of the piezoelectric plate. From the first end face to the first end face from the position of the length distance 1/3 of the distance between the first end face and the second end face from the first end face In the first direction to a position of a length distance of 2/3 of the distance between the second end face The piezoelectric plates between the first primary side electrode and the second primary side electrode are polarized in the thickness direction between the first main surface and the second main surface, respectively; The piezoelectric plate between the primary side electrode and the fourth primary side electrode is polarized in the thickness direction, and the third primary side electrode and the fourth primary side electrode and the first primary side electrode and the second side electrode are polarized. The primary electrode of is electrically connected in a predetermined connection state and has a length of 1/3 of the distance between the first end face and the second end face from the second end face in the first direction. A predetermined region of the piezoelectric plate up to a distance position is a secondary side region, and at least a secondary side electrode is provided on the first main surface near the second end surface or the second end surface of the secondary side region, At least the secondary electrode and the secondary region; It is between the third primary-side electrode of the high voltage step-up ratio of the piezoelectric transformer, which is polarized in the direction of the first. A substantially rectangular parallelepiped piezoelectric plate having a first main surface and a second main surface facing the first main surface, wherein the piezoelectric plate is a direction in which one side of the first main surface extends; There is a 1st primary side area | region, a 2nd primary side area | region, and a secondary side area | region, and a said 1st primary side area | region, a said 2nd primary side area | region, and a said secondary side area | region are different areas, and the said 1st The vehicle-side region has a length of 1 / n (n is an integer of 2 or more) of the length in the first direction of the piezoelectric plate, and the first main surface and the second of the first primary-side region A first primary side electrode and a second primary side electrode are respectively provided on the main surface thereof so as to face each other, and between the first primary side electrode and the second primary side electrode are polarized in the thickness direction of the piezoelectric plate, The second primary side region has a length of 1 / n or less in length in the first direction of the piezoelectric plate. A third primary side electrode and a fourth primary side electrode are provided to face each other on the first main surface and the second main surface of the second primary side region of the piezoelectric plate, respectively. Between the third primary side electrode and the fourth primary side electrode of the second primary side region is polarized in a predetermined direction in the thickness direction of the piezoelectric plate, and the third primary side electrode and the fourth The first main surface, the first primary side electrode and the second primary side electrode are electrically connected in a predetermined connection state, and the first main surface is perpendicular to the one side of the first main surface in the secondary side region. A first secondary side electrode and a second secondary side electrode are provided to face each other in a second direction, a direction in which other sides of the second side extend, and at least the first secondary side electrode and the second second side of the secondary side region are provided. The boost ratio in which the differential electrodes are polarized in the second direction A piezoelectric transformer. 15. The display device of claim 14, wherein a third secondary electrode is disposed between the first and second secondary electrode electrodes of the secondary region in the first and second secondary electrode and the second direction, respectively. Opposite to each other, between the first secondary side electrode and the third secondary side electrode in the secondary side region are polarized in a second direction, and the second secondary side electrode and the third secondary side electrode in the secondary side region Between the secondary side electrodes is polarized in a direction opposite to the polarization direction between the first secondary side electrode and the third secondary side electrode in the second direction, and the first and second secondary side electrodes and the third A piezoelectric transformer with a high voltage-ratio ratio that draws secondary power from and to the secondary electrode. The said secondary side electrode is electrically mechanically connected to one of the said secondary side electrode and the said 2nd secondary side electrode, or one of the said secondary side electrode and the said 3rd secondary side electrode. It further has a lead terminal for supporting the piezoelectric plate, the piezoelectric high piezoelectric ratio of the lead terminal has an elastic structure portion in which the longitudinal direction or the first direction bends and vibrates in the longitudinal direction or the first direction in accordance with the vibration Trance. 16. The lead terminal according to claim 14 or 15, further comprising a lead terminal for supporting the piezoelectric plate electrically and mechanically connected to at least one of the first to third secondary side electrodes, wherein the lead terminal is in the second direction. A piezoelectric transformer having a high boosting ratio having an elastic structure portion which bends and vibrates in the second direction according to the vibration of. An inverter incorporating the piezoelectric transformer according to claim 1. A liquid crystal display incorporating the piezoelectric transformer according to claim 1. 15. The apparatus according to claim 13, wherein the secondary side electrode is electrically and mechanically connected to one of the secondary side electrode and the second secondary side electrode or to a family of the secondary side electrode and the third secondary side electrode. It further has a lead terminal for supporting the piezoelectric plate, the piezoelectric high piezoelectric ratio of the lead terminal has an elastic structure portion in which the longitudinal direction or the first direction bends and vibrates in the longitudinal direction or the first direction in accordance with the vibration Trance. An inverter incorporating the piezoelectric transformer according to claim 13. An inverter incorporating the piezoelectric transformer according to claim 14. A liquid crystal display incorporating the piezoelectric transformer according to claim 13. A liquid crystal display incorporating the piezoelectric transformer according to claim 14.