PIEZOELECTRIC VIBRATOR AND PIEZOELECTRIC VIBRATOR ASSEMBLY

Abstract

Provided are a piezoelectric vibrator and a piezoelectric vibrator assembly having a small volume, fast response, and high energy conversion efficiency. The piezoelectric vibrator includes a piezoelectric body and an amplifying unit fixedly supported on at least one of two opposite sides of the piezoelectric body. The piezoelectric body comprises a single-layer or multi-layer material with a piezoelectric effect. The amplifying unit is a flat structure formed by an elastic reinforcing element and having a same shape as the piezoelectric body. The elastic reinforcing element is a metal sheet. The piezoelectric body, when an external voltage is applied, expands or contracts along a first direction parallel to a plane of the piezoelectric body, and simultaneously, the amplifying unit contracts or expands along a second direction. The first direction and the second direction are perpendicular to each other.

Claims

1. A piezoelectric vibrator comprising: a piezoelectric body; and an amplifying unit fixedly supported to at least one of two opposite sides of the piezoelectric body, wherein the piezoelectric body comprises a single-layer or multi-layer material with a piezoelectric effect, the amplifying unit is a flat structure formed by an elastic reinforcing element and having a same shape as the piezoelectric body, the elastic reinforcing element being a metal sheet, and when an external voltage is applied to the piezoelectric body, the piezoelectric body expands or contracts along a first direction parallel to a plane of the piezoelectric body, and simultaneously, the amplifying unit contracts or expands along a second direction, the first direction and the second direction being perpendicular to each other.

2. The piezoelectric vibrator according to claim 1, wherein the piezoelectric body comprises: a plurality of stacked internal electrodes having different polarities; a plurality of stacked piezoelectric layers surrounding peripheries of the plurality of internal electrodes and electrically connected to the plurality of internal electrodes; and a plurality of external electrodes surrounding peripheries of the plurality of piezoelectric layers and electrically connected to the plurality of piezoelectric layers, wherein the plurality of internal electrodes and the plurality of piezoelectric layers are stacked along the second direction, and each of the plurality of piezoelectric layers comprises a single piezoelectric ceramic layer or a plurality of piezoelectric ceramic layers.

3. The piezoelectric vibrator according to claim 1, wherein the piezoelectric body is in a shape of a strip or a square or a circle.

4. The piezoelectric vibrator according to claim 1, wherein the piezoelectric body comprises a plurality of piezoelectric ceramic layers polarized along the first direction.

5. The piezoelectric vibrator according to claim 1, wherein the amplifying unit comprises: a first section fixed to the piezoelectric body; two second sections respectively bending and obliquely extending from two opposite ends of the first section away from the piezoelectric body; two third sections respectively bending and extending from the two second sections in a direction away from the first section and spaced apart from the piezoelectric body; a fourth section spaced apart from and mirror-symmetrical with the first section; two fifth sections respectively extending outward from the fourth section and respectively spaced apart from and mirror-symmetrical with the two second sections; and two sixth sections respectively attached to the two third sections and mirror-symmetrical with each other, wherein each of the two third sections is attached and fixed to a corresponding sixth section of the two sixth sections and constitutes a thickened end portion of the amplifying unit together with the corresponding sixth section, wherein the thickened end portion is supported on and fixed to the piezoelectric body, and wherein the two first sections, the two second sections, the fourth section, and the two fifth sections jointly constitute the flat structure.

6. The piezoelectric vibrator according to claim 5, wherein a length of the thickened end portion along the first direction is equal to half of a length of the flat structure along the first direction.

7. The piezoelectric vibrator according to claim 5, further comprising a fixed end block, wherein the thickened end portion is supported on and connected to the piezoelectric body through the fixed end block, and the fixed end block is electrically insulated from the piezoelectric body.

8. The piezoelectric vibrator according to claim 7, wherein the amplifying unit comprises two amplifying units respectively located on the two opposite sides of the piezoelectric body, and the fixed end block comprises at least two fixed end blocks, and wherein each of the two amplifying units is connected to the piezoelectric body through one of the at least two fixed end blocks.

9. The piezoelectric vibrator according to claim 5, wherein the first section is fixed to a center of the piezoelectric body, and the amplifying unit has a symmetrical structure centered on the first section, and wherein an amplification factor of the piezoelectric vibrator is a ratio of a displacement amount of the piezoelectric body along the first direction to a displacement amount of the amplifying unit along the second direction.

10. The piezoelectric vibrator according to claim 5, wherein the amplifying unit is in a shape of a rectangle or a square or a circle.

11. The piezoelectric vibrator according to claim 5, wherein the amplifying unit further comprises a fixed portion extending from the thickened end portion and fixed to an edge of the piezoelectric body, and the thickened end portion bends and obliquely extends from the flat structure to the edge of the piezoelectric body.

12. The piezoelectric vibrator according to claim 11, wherein the amplifying unit comprises at least one amplifying unit, one amplifying unit of the at least one amplifying unit is located on one side of the piezoelectric body, and the other side of the piezoelectric body is connected to another amplifying unit of the at least one amplifying unit or a feasible structure configured to buffer amplification.

13. The piezoelectric vibrator according to claim 5, wherein the amplifying unit further comprises a bending portion bending and obliquely extending from the thickened end portion to an edge of the piezoelectric body and a fixed portion fixed to the edge of the piezoelectric body.

14. The piezoelectric vibrator according to claim 13, wherein the amplifying unit comprises at least one amplifying unit, one amplifying unit of the at least one amplifying unit is located on one side of the piezoelectric body, and the other side of the piezoelectric body is connected to another amplifying unit of the at least one amplifying unit or a feasible structure configured to buffer amplification.

15. The piezoelectric vibrator according to claim 8, wherein the fixed end block comprises at least one fixed end block, each fixed end block is fixed to an outer side of the piezoelectric body along the first direction, and the thickened end portions corresponding to the two amplifying units are respectively fixed to two opposite ends of a fixed end block of the at least one fixed end block along the second direction; and wherein the piezoelectric vibrator further comprises a connecting section made of a same metal as the amplifying unit; wherein the connecting section is fixed to a side of the fixed end block away from the piezoelectric body along the first direction, and the third section of the amplifying unit is connected to the connecting section.

16. The piezoelectric vibrator according to claim 15, further comprising two buffer members, the two buffer members each being fixed to a side of the corresponding first section away from the piezoelectric body and arranged apart from the fourth section.

17. The piezoelectric vibrator according to claim 16, wherein the two buffer members are made of a polymer.

18. The piezoelectric vibrator according to claim 8, further comprising a connecting section made of a same metal as the amplifying unit, wherein the connecting section is fixed to an outer side of the piezoelectric body along the first direction, and the third sections corresponding to the two amplifying units are respectively connected to the connecting section.

19. The piezoelectric vibrator according to claim 18, further comprising two buffer members, the two buffer members each being fixed to a side of the corresponding first section away from the piezoelectric body and arranged apart from the fourth section.

20. The piezoelectric vibrator according to claim 19, wherein the two buffer members are made of a polymer.

21. The piezoelectric vibrator according to claim 18, wherein the sixth sections corresponding to the two amplifying units respectively extend away from the first section, and two opposite sides of the fixed end block along the second direction are connected extension parts of the two sixth sections.

22. The piezoelectric vibrator according to claim 21, further comprising two buffer members, the two buffer members each being fixed to a side of the corresponding first section away from the piezoelectric body and arranged apart from the fourth section.

23. The piezoelectric vibrator according to claim 22, wherein the two buffer members are made of a polymer.

24. The piezoelectric vibrator according to claim 5, wherein the amplifying unit comprises a first amplifying unit, a second amplifying unit, and a third amplifying unit, the first, second and third amplifying units being all located on a same side of the piezoelectric body and jointly forming a three-layer elastic element structure, wherein the first amplifying unit and the second amplifying unit are connected side by side, the third section of the first amplifying unit and the third section of the second amplifying unit are made of a same metal sheet, wherein the sixth section of the first amplifying unit and the sixth section of the second amplifying unit are made of a same metal sheet, wherein the third amplifying unit is arranged on a side of the first amplifying unit and the second amplifying unit away from the piezoelectric body, wherein the first section of the third amplifying unit, the sixth section of the first amplifying unit, and the sixth section of the second amplifying unit are all made of a same metal sheet, wherein the two second sections of the third amplifying unit are respectively the fifth sections extending from the connected sixth sections the first amplifying unit and the second amplifying unit, wherein the two third sections of the third amplifying unit are respectively the fourth section of the first amplifying unit and the fourth section of the second amplifying unit, and wherein the two sixth sections of the third amplifying unit are fixedly attached to the fourth section of the first amplifying unit and the fourth section of the second amplifying unit respectively.

25. The piezoelectric vibrator according to claim 24, wherein the amplifying unit comprises two amplifying units respectively located on the two opposite sides of the piezoelectric body.

26. A piezoelectric vibrator assembly comprising at least two piezoelectric vibrators according to claim 8, wherein the at least two piezoelectric vibrators are fixedly stacked along the second direction, and the fourth sections in adjacent amplifying units of the at least two piezoelectric vibrators are fitted and fixed to each other.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0034] FIG. 1 is a three-dimensional view of a piezoelectric vibrator according to Embodiment 1 of the present disclosure;

[0035] FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1;

[0036] FIG. 3 is a schematic structural diagram of a piezoelectric body of the piezoelectric vibrator according to Embodiment 1 of the present disclosure;

[0037] FIG. 4 is another schematic structural diagram of the piezoelectric body of the piezoelectric vibrator according to Embodiment 1 of the present disclosure;

[0038] FIG. 5 is a schematic diagram of a principle of an amplification factor of the piezoelectric vibrator according to Embodiment 1 of the present disclosure;

[0039] FIG. 6 is a another three-dimensional view of the piezoelectric vibrator according to Embodiment 1 of the present disclosure;

[0040] FIG. 7 is a three-dimensional view of a piezoelectric vibrator according to Embodiment 2 of the present disclosure;

[0041] FIG. 8 is a cross-sectional view taken along line B-B in FIG. 7;

[0042] FIG. 9 is another three-dimensional view of the piezoelectric vibrator according to Embodiment 2 of the present disclosure;

[0043] FIG. 10 is a three-dimensional view of a piezoelectric vibrator according to Embodiment 3 of the present disclosure;

[0044] FIG. 11 is a cross-sectional view taken along line C-C in FIG. 10;

[0045] FIG. 12 is another three-dimensional view of the piezoelectric vibrator according to Embodiment 3 of the present disclosure;

[0046] FIG. 13 is a three-dimensional view of a piezoelectric vibrator according to Embodiment 4 of the present disclosure;

[0047] FIG. 14 is a three-dimensional view of a piezoelectric vibrator according to Embodiment 5 of the present disclosure;

[0048] FIG. 15 is a three-dimensional view of a piezoelectric vibrator according to Embodiment 6 of the present disclosure;

[0049] FIG. 16 is a schematic exploded view of a partial structure of a piezoelectric vibrator according to Embodiment 7 of the present disclosure; and

[0050] FIG. 17 is a schematic structural diagram of a piezoelectric vibrator assembly according to Embodiment 8 of the present disclosure.

DESCRIPTION OF EMBODIMENTS

[0051] The present disclosure will be further described below in conjunction with the accompanying drawings and embodiments.

Embodiment 1

[0052] Embodiment 1 of the present disclosure provides a piezoelectric vibrator 100. Referring to FIG. 1 and FIG. 2, the piezoelectric vibrator 100 includes a piezoelectric body 1 and an amplifying unit 2 supported on and fixed to at least one side of two opposite sides of the piezoelectric body 1. That means one of the two opposite sides of the piezoelectric body 1 is provided with an amplifying unit 2, or two opposite sides of the piezoelectric body 1 each are provided with an amplifying unit 2.

[0053] In Embodiment 1, the piezoelectric vibrator 100 further includes a fixed end block 3. The fixed end block 3 is configured to support the amplifying unit 2 and connect the amplifying unit 2 to the piezoelectric body 1.

[0054] The piezoelectric body 1 include a single layer piezoelectric material or a multi-layer piezoelectric material. The piezoelectric material has a piezoelectric effect.

[0055] Referring to FIG. 3, the piezoelectric body 1 includes a plurality of stacked internal electrodes 11 having different polarities, a plurality of stacked piezoelectric layers 12, and external electrodes 13. The plurality of stacked piezoelectric layers 12 surround the peripheries of the plurality of internal electrodes 11 and are electrically connected to the internal electrodes 11. The external electrodes 13 surround the peripheries of the piezoelectric layers 12 and are electrically connected to the plurality of piezoelectric layers 12.

[0056] The first direction X is a length direction of the piezoelectric body 1. The first direction X is parallel to a plane of the piezoelectric body 1.

[0057] The plurality of internal electrodes 11 and the plurality of piezoelectric layers 12 are stacked along the second direction Y. The internal electrodes 11 having different polarities are alternately arranged and are connected to corresponding external electrodes 13 thereof.

[0058] The second direction Y is a thickness direction of the piezoelectric body 1. The first direction X and the second direction Y are perpendicular to each other.

[0059] In Embodiment 1, the piezoelectric body 1 is made of single-layer or multi-layer piezoelectric ceramics. Optionally, the plurality of piezoelectric layers 12 are all made of single-layer lead zirconate titanate ceramic, or the plurality of piezoelectric layers 12 are all made of multi-layer lead zirconate titanate ceramics. The piezoelectric body 1 has a first telescopic direction less than or equal to 10 mm and a second telescopic direction less than or equal to 100 mm. The thickness of the piezoelectric body 1 may be appropriately optimized and selected according to an application scenario and a number of the lead zirconate titanate ceramic layers.

[0060] In another embodiment, referring to FIG. 4, the piezoelectric body 1 is made of multi-layer piezoelectric ceramics polarized along the first direction X. A direction of strain displacement of the piezoelectric body 1 is in a same dimension as a direction of an electric field applied to the piezoelectric body 1, and an inverse piezoelectric effect in a direction d33 is adopted. In the operating mode, it is needed to apply a pre-tension force to the piezoelectric stack to prevent failure of the piezoelectric body 1.

[0061] The piezoelectric body 1 is in a shape of a strip or a square or a circle. In Embodiment 1, the piezoelectric body 1 is in a shape of a square. Certainly, the piezoelectric body 1 is not limited to the above shapes. In another embodiment, referring to FIG. 5, the piezoelectric body 1A is in a shape of a strip.

[0062] The amplifying unit 2 is in a shape of a rectangle or a square or a circle. In Embodiment 1, the piezoelectric body 1 is in a shape of a circle, and the amplifying unit 2 is in a shape of a circle, which is in a same shape as the piezoelectric body 1.

[0063] The amplifying unit 2 is a flat structure 20 formed by an elastic reinforcing element and having a same shape as the piezoelectric body 1. The elastic reinforcing element is a metal sheet. The metal sheet is made of metal materials such as titanium, titanium alloy, stainless steel, copper, and copper alloy. The elastic reinforcing element may be formed by stamping, so manufacturing costs of the piezoelectric vibrator 100 are relatively low.

[0064] Specifically, the amplifying unit 2 includes a first section 21, two second sections 22, two third sections 23, a fourth section 24, two fifth sections 25, and two sixth sections 26. The first section 21 is fixed to the piezoelectric body 1 and includes two opposite ends. The two second sections 22 bend and obliquely extend, in a direction away from the piezoelectric body 1, from the two opposite ends of the first section 21 respectively. The two third sections 23 bend and extend, in a direction away from the first section 21, from the two second sections 22 respectively, and are spaced apart from the piezoelectric body 1. The fourth section 24 is spaced apart from the first section 21 and is mirror-symmetrical with the first section 21. The two fifth sections 25 extend outward from the fourth section 24 and are respectively spaced apart from and mirror-symmetrical with the two second sections 22. The two sixth sections 26 are respectively fitted to the two third sections 23 and mirror-symmetrical with the two third sections 23. Each of the third sections 23 is attached and fixed to a corresponding one of the sixth sections 26 and constitutes a thickened end portion 2A of the amplifying unit 2 together with the corresponding sixth section 26.

[0065] The thickened end portion 2A is supported on and fixed to the piezoelectric body 1. In Embodiment 1, the thickened end portion 2A is supported on and fixed to the piezoelectric body 1 through the fixed end block 3. The fixed end block 3 is electrically insulated from the piezoelectric body 1. In specific manufacturing, the fixed end block 3 is connected to two ends of the piezoelectric body 1 by means of glue bonding or the like.

[0066] The first section 21, the second sections 22, the fourth section 24, and the fifth sections 25 jointly constitute the flat structure 20. The flat structure 20 is fixed to an end portion of the piezoelectric body 1 close to an outer edge, so as to make full use of mechanical deformation of the piezoelectric body 1. The amplifying unit 2 adopts a triangular amplification principle, and the amplifying unit 2 on one side of the piezoelectric body 1 adopts a double-layer elastic reinforcing element to form a prismatic amplification unit structure, that is, the flat structure 20.

[0067] The sixth section 26 forms a platform for connecting a load required to be driven, or for a fixed substrate. In the amplifying unit 2, an angle of a lower part of a prism cannot be too small, generally larger than an angle of an upper part of the prism, and rigidity of the amplifying unit 2 cannot be too large, so as to prevent an excessive limitation on telescopic displacement of the piezoelectric layer.

[0068] In Embodiment 1, a length of the thickened end portion 2A along the first direction X is equal to half of a length of the flat structure 20 along the first direction X. The structure enables the flat structure 20 to realize a prismatic amplification unit structure.

[0069] When the piezoelectric body 1 is subjected to an external voltage, due to the inverse piezoelectric effect, the piezoelectric body 1 expands or contracts along the first direction X parallel to a plane of the piezoelectric body 1, that is, perpendicular to a direction of an electric field of the internal electrodes, namely a d31 effect. At the same time, the amplifying unit 2 contracts or expands along the second direction Y. The amplifying unit 2 can not only convert a movement along the first direction X to a movement along the second direction Y, but also amplify displacement of the piezoelectric body 1 along the first direction X, so as to alleviate the problem of small response displacement or a requirement for a high stimulus voltage of the piezoelectric body 1. By use of an inverse piezoelectric effect of a piezoelectric material of the piezoelectric body 1, the piezoelectric vibrator 100 is not affected by an electromagnetic environment. A pre-tension force may be applied. The piezoelectric material employs a telescopic mode. Compared with a bending mode, reliability of the material is greatly improved. Therefore, the piezoelectric vibrator 100 of the present disclosure has a small volume, fast response, an adjustable resonance frequency, a wide operating frequency, and high energy conversion efficiency. Therefore, the piezoelectric vibrator 100 of the present invention is used as a piezoelectric motor for tactile feedback and applied to many fields such as mobile phones, tablets, notebook computers, vehicles, and stylus pens. The piezoelectric vibrator 100 of the present disclosure is further used as a sounding unit of a speaker and applied to basic electronic devices in application fields such as sound on display and bone conduction. The piezoelectric vibrator 100 of the present disclosure is also used as a pressure sensor to sense an external pressure change and convert the external pressure change into a voltage signal.

[0070] In some embodiments, two amplifying units 2 are provided. The two amplifying units 2 are respectively located on two opposite sides of the piezoelectric body 1. This configuration is conducive to further improving a displacement amplification ratio of the piezoelectric vibrator 100 of the present disclosure.

[0071] In Embodiment 1, the first section 21 is fixed to a central position of the piezoelectric body 1. The amplifying unit 2 has a symmetrical structure with respect to the first section 21. The structure converts lateral displacement of the piezoelectric body 1 into longitudinal displacement of the amplifying unit 2. Referring to FIG. 6, an amplification factor of the piezoelectric vibrator 100 is a ratio of a displacement amount of the piezoelectric body 1 along the first direction X to a displacement amount of the amplifying unit 2 along the second direction Y. The displacement amount of the piezoelectric body 1 along the first direction X is ?x1. The displacement amount of the amplifying unit 2 along the second direction Y is ?x2. The following formula is satisfied: the amplification factor of the piezoelectric vibrator 100=?x2/?x1. Therefore, the amplifying unit 2 can be formed by combining two layers of metal brackets, and a total amplification factor is a sum of amplification factors of upper and lower parts of a prism formed by the metal brackets, thereby further increasing the amplification factor. In a specific design, the amplification factor of the amplifying unit 2 can be flexibly designed, and various design goals can be achieved by changing opening angles and structures of the upper and lower metal brackets respectively.

[0072] The fixed end block 3 is made of metal. The fixed end block 3 made of metal is conducive to manufacturing and forming.

[0073] The fixed end block 3 is respectively connected to the piezoelectric body 1 and the amplifying unit 2 and located on an edge of the piezoelectric body 1. The amplifying unit 2 is connected to an end portion edge of the piezoelectric body 1 to maximize the use of deformation generated by the piezoelectric body 1. In some embodiments, an extension beam of the sixth section 26 is parallel to a surface of the piezoelectric body 1, and the sixth sections 26 are tightly adhered or brazed to two ends of the piezoelectric body 1 through the thickened end portion 2A, so as to prevent relative motion between the amplifying structure and the piezoelectric layer.

[0074] In Embodiment 1, at least two fixed end blocks 3 are provided. Each of the amplifying units 2 is connected to the piezoelectric body 1 through one of the fixed end blocks 3.

Embodiment 2

[0075] Embodiment 2 of the present disclosure provides a piezoelectric vibrator 200.

[0076] The piezoelectric vibrator 200 in Embodiment 2 of the present disclosure is basically the same as the piezoelectric vibrator 100 in Embodiment 1 of the present disclosure. The piezoelectric vibrator 200 in Embodiment 2 of the present disclosure is different from the piezoelectric vibrator 100 as follows.

[0077] Referring to FIG. 7 and FIG. 8, the amplifying unit 2a further includes a bending portion 2Ca bending and obliquely extending from the thickened end portion 2Aa to an edge of the piezoelectric body 1a and a fixed portion 2Ba fixed to the edge of the piezoelectric body 1a. The fixed portion 2Ba is electrically insulated from the piezoelectric body 1a.

[0078] The thickened end portion 2Aa functions as a parallel beam, the bending portion 2Ca is arranged by obliquely and downwards from the thickened end portion 2Aa, and the fixed portion 2Ba is fixed to the piezoelectric body 1a. The structure can realize a same function as the amplifying unit 2 of the piezoelectric vibrator 100 in Embodiment 1 of the present disclosure. Certainly, compared with the amplifying unit 2, the amplifying unit 2a has certain differences in implementation difficulty and performance.

[0079] Compared with the piezoelectric vibrator 100 in Embodiment 1, the bending portion 2Ca and the fixed portion 2Ba in Embodiment 2 jointly constitute the fixed end block 3 of the piezoelectric vibrator 100 in Embodiment 1.

[0080] According to the piezoelectric vibrator 200 in Embodiment 2 of the present disclosure, the amplifying unit 2a is directly connected to the piezoelectric body 1a through the bending portion 2Ca and the fixed portion 2Ba, so there is no need to additionally arrange the fixed end block 3 of the piezoelectric vibrator 100 in Embodiment 1, which simplifies the entire solution and facilitates machining and manufacturing of the piezoelectric vibrator 200. The piezoelectric vibrator 200 in Embodiment 2 of the present disclosure has certain change in the structure due to the addition of the bending portion 2Ca, and displacement amplification performance thereof is inferior to that of the piezoelectric vibrator 100 in Embodiment 1 of the present invention.

[0081] In Embodiment 2, at least one amplifying unit 2a is provided, the amplifying unit 2a is located on one side of the piezoelectric body 1a, and the other side of the piezoelectric body 1a is provided with a structure having a same shape as the piezoelectric body 1a. The other side of the piezoelectric body 1a is connected to another amplifying unit 2a or another feasible structure configured to buffer amplification. That is, the structure arranged on the other side of the piezoelectric body 1a may be another structure adopted according to an actual design requirement, for example, another amplifying unit 2a, or another feasible structure may alternatively be adopted as required.

[0082] In another embodiment, referring to FIG. 9, the piezoelectric body 1Aa is in a shape of a strip.

Embodiment 3

[0083] Embodiment 3 of the present disclosure provides a piezoelectric vibrator 300.

[0084] The piezoelectric vibrator 300 in Embodiment 3 of the present disclosure is basically the same as the piezoelectric vibrator 100 in Embodiment 1 of the present invention. The piezoelectric vibrator 300 in Embodiment 3 of the present disclosure is different from the piezoelectric vibrator 100 in Embodiment 1 of the present disclosure as follows.

[0085] Referring to FIG. 10 and FIG. 11, the amplifying unit 2b further includes a fixed portion 2Bb extending from the thickened end portion 2Ab and fixed to an edge of the piezoelectric body 1b. The thickened end portion 2Ab obliquely bends from the flat structure 20b and extends from the flat structure 20b to the edge of the piezoelectric body 1b. The fixed portion 2Bb is electrically insulated from the piezoelectric body 1b.

[0086] Compared with the piezoelectric vibrator 100 in Embodiment 1, the fixed portion 2Bb in Embodiment 3 plays the role of the fixed end block 3 of the piezoelectric vibrator 100 in Embodiment 1.

[0087] According to the piezoelectric vibrator 300 in Embodiment 3 of the present disclosure, the amplifying unit 2b is directly connected to the piezoelectric body 1b through the fixed portion 2Bb, so there is no need to additionally arrange the fixed end block 3 of the piezoelectric vibrator 100 in Embodiment 1, which simplifies the entire solution and facilitates machining and manufacturing of the piezoelectric vibrator 300. However, the structure is connected to the piezoelectric body 1b through an inclined cantilever, that is, the inclined thickened end portion 2Ab, and a length of the inclined thickened end portion 2Ab can be changed, thereby adjusting the amplification factor of the entire amplifying structure. Moreover, since the thickened end portion 2Ab as a cantilever has certain deformation, displacement amplification performance thereof is inferior to the displacement amplification performance of both the piezoelectric vibrator 100 in Embodiment 1 and the piezoelectric vibrator 200 in Embodiment 2 of the present disclosure.

[0088] In Embodiment 3, at least one amplifying unit 2b is provided, the amplifying unit 2b is located on one side of the piezoelectric body 1b, and the other side of the piezoelectric body 1b is provided with a structure having a same shape as the piezoelectric body 1b. The other side of the piezoelectric body 1b is connected to another amplifying unit 2b or a feasible structure configured to provide buffer amplification. That is, the structure arranged on the other side of the piezoelectric body 1b may be a structure adopted according to an actual design requirement, for example, another amplifying unit 2b, or a feasible structure may alternatively be adopted as required.

[0089] In another embodiment, referring to FIG. 12, the piezoelectric body 1Ab is in a shape of a strip.

Embodiment 4

[0090] Embodiment 4 of the present disclosure provides a piezoelectric vibrator 400.

[0091] The piezoelectric vibrator 400 in Embodiment 4 of the present disclosure is basically the same as the piezoelectric vibrator 100 in Embodiment 1 of the present disclosure. The piezoelectric vibrator 400 in Embodiment 4 of the present disclosure is different from the piezoelectric vibrator 100 in Embodiment 1 of the present disclosure as follows.

[0092] Referring to FIG. 13, specifically, at least one fixed end block 3c is provided. The fixed end block 3c is fixed to an outer side of the piezoelectric body 1c along the first direction Xc. The thickened end portions 2Ac corresponding to the two amplifying units 2c are respectively fixed to two opposite sides of the fixed end block 3c along the second direction Yc.

[0093] The piezoelectric vibrator 400 further includes a connecting section 4c. The connecting section 4c is made of a same metal as the amplifying unit 2c. The connecting section 4c is fixed to a side of the fixed end block 3c away from the piezoelectric body 1c along the first direction Xc. The third section 23c of the amplifying unit 2c is connected to the connecting section 4c. In the piezoelectric vibrator 400, the fixed end block 3c is an integral structure and has two parts on two sides of the piezoelectric body 1c, and the third section 23c of the amplifying unit 2c and the connecting section 4c can be integrally formed, thereby improving the reliability of the piezoelectric vibrator 400.

[0094] At the end region of the piezoelectric vibrator 400, the connecting section 4c and one fixed end block 3c adopt an integral structure to realize a vertically integral rigid body, and an outer side of the piezoelectric vibrator 400 is welded to the third section 23c through the connecting section 4c to provide higher-strength support.

[0095] The piezoelectric body 1c is connected to the fixed end block 3c by a pre-tension force, and the piezoelectric body 1c only bears pressure but not tension, so as to prevent the problem of insufficient strength due to glue connection, or only serves as a means of auxiliary positioning, thereby improving the reliability of the piezoelectric vibrator 400.

[0096] In the structure of the piezoelectric vibrator 400, the two amplifying units 2c further constitute a complete elastic amplifying frame. After the overall assembly is completed, the piezoelectric body 1c may be positioned and pre-tensioned to simplify the assembly process, so that the piezoelectric vibrator 400 is easy to manufacture.

[0097] In order to increase the amplification factor of the amplifying unit 2c, the piezoelectric vibrator 400 in Embodiment 4 of the present disclosure is structurally the same as the piezoelectric vibrator 100 in Embodiment 1 of the present disclosure, and two amplifying units 2c are provided. The two amplifying units 2c are respectively located on two opposite sides of the piezoelectric body 1c.

[0098] In Embodiment 4, the piezoelectric vibrator 400 further includes a buffer member 5c. Two buffer members 5c are provided. Each of the two buffer members 5c is fixed to a side of the corresponding first section 21c away from the piezoelectric body 1c and arranged apart from the fourth section 24c.

[0099] The buffer member 5c is made of a polymer. Optionally, the buffer member 5c is made of a polymer such as foam or rubber. In Embodiment 4, the buffer member 5c is made of foam. The buffer member 5c that uses foam for a buffer effect prevents structural collapse and failure. The buffer member 5c is used for position limiting and used as a buffer structure to prevent structure failure caused by excessive extrusion due to damages to the structure caused by excessively large pressure on the piezoelectric vibrator 400, thereby improving the reliability of the piezoelectric vibrator 400.

Embodiment 5

[0100] Embodiment 5 of the present disclosure provides a piezoelectric vibrator 500.

[0101] The piezoelectric vibrator 500 in Embodiment 5 of the present disclosure is basically the same as the piezoelectric vibrator 100 in Embodiment 1 of the present disclosure. The piezoelectric vibrator 500 in Embodiment 5 of the present disclosure is different from the piezoelectric vibrator 100 in Embodiment 1 of the present disclosure as follows.

[0102] Referring to FIG. 14, specifically, the piezoelectric vibrator 500 further includes a connecting section 4d. The connecting section 4d is made of a same metal as the amplifying unit 2d. The connecting section 4d is fixed to an outer side of the piezoelectric body 1d along the first direction Xd. The third sections 23d corresponding to the two amplifying units 2d are respectively connected to the connecting section 4d.

[0103] At least one fixed end block 3d is provided. The fixed end block 3d is fixed to a side of the connecting section 4d away from the piezoelectric body 1d along the first direction Xd. The structure of the piezoelectric vibrator 500 is that the fixed end block 3d is placed on outermost sides of the piezoelectric body 1d and the amplifying unit 2d.

[0104] The structural design of the piezoelectric vibrator 500 that the fixed end block 3d is welded to an end portion of the connecting section 4d realizes a vertically overall rigid body, and an inner side is welded to the third section 23d through the connecting section 4d, which provides higher-strength support, thereby improving reliability of the piezoelectric vibrator 500.

[0105] The piezoelectric body 1d is connected to the fixed end block 3d by a pre-tension force, and the piezoelectric body 1d only bears pressure but not tension, so as to prevent the problem of insufficient strength of glue connection, or only serves as a means of auxiliary positioning, thereby improving the reliability of the piezoelectric vibrator 500.

[0106] In the structure of the piezoelectric vibrator 500, the two amplifying units 2d further constitute a complete elastic amplifying frame. After the overall assembly is completed, the piezoelectric body 1d may be positioned and pre-tensioned to simplify an assembly process, so that the piezoelectric vibrator 500 is easy to manufacture.

[0107] In order to increase the amplification factor of the amplifying unit 2d, the piezoelectric vibrator 500 in Embodiment 5 of the present disclosure is structurally the same as the piezoelectric vibrator 100 in Embodiment 1 of the present disclosure, and two amplifying units 2d are provided. The two amplifying units 2d are respectively located on two opposite sides of the piezoelectric body 1d.

[0108] In Embodiment 5, the piezoelectric vibrator 500 further includes two buffer members 5d. Each of the two buffer members 5d is fixed to a side of the corresponding first section 21d away from the piezoelectric body 1d and arranged apart from the fourth section 24d.

[0109] The buffer member 5d is made of a polymer. Optionally, the buffer member 5d is made of a polymer such as foam or rubber. In Embodiment 5, the buffer member 5d is made of foam. The buffer member 5d uses the cushioning effect of the foam to prevent structural collapse and failure. The buffer member 5d can be used for position limiting and used as a buffer structure to prevent structure failure caused by excessive extrusion due to damages to the structure caused by excessively large pressure on the piezoelectric vibrator 500, thereby improving the reliability of the piezoelectric vibrator 500.

Embodiment 6

[0110] Embodiment 6 of the present disclosure provides a piezoelectric vibrator 600.

[0111] The piezoelectric vibrator 600 in Embodiment 6 of the present disclosure is basically the same as the piezoelectric vibrator 500 in Embodiment 5 of the present disclosure. The piezoelectric vibrator 600 in Embodiment 6 of the present disclosure is different from the piezoelectric vibrator 500 in Embodiment 5 of the present disclosure as follows.

[0112] Referring to FIG. 15, specifically, the sixth sections 26f corresponding to the two amplifying units 2f respectively extend in a direction away from the corresponding first section 21f, and two opposite sides of the fixed end block 3f along the second direction Yf are connected extension parts of the two sixth sections 26f. The connection manner between the amplifying unit 2f and the fixed end block 3f in the structure of the piezoelectric vibrator 600 is a right-angle cladding mode.

[0113] In the piezoelectric vibrator 600, the fixed end block 3f is welded to an end portion of the connecting section 4f to realize a vertically overall rigid body, and an inner side is welded to the third section 23f through the connecting section 4f, which provides higher-strength support, thereby improving reliability of the piezoelectric vibrator 600.

[0114] The piezoelectric body 1f is connected to the fixed end block 3f by a pre-tension force, and the piezoelectric body 1f only bears pressure but not tension, so as to prevent the problem of insufficient strength of glue connection, or only serves as a means of auxiliary positioning, thereby improving the reliability of the piezoelectric vibrator 600.

[0115] In the structure of the piezoelectric vibrator 600, the two amplifying units 2f further constitute a complete elastic amplifying frame. After the overall assembly is completed, the piezoelectric body 1f may be positioned and pre-tensioned to simplify an assembly process, so that the piezoelectric vibrator 600 is easy to manufacture.

[0116] In Embodiment 6, the piezoelectric vibrator 600 further includes a two buffer members 5f. Each of the two buffer members 5f is fixed to a side of the corresponding first section 21f away from the piezoelectric body 1f and arranged apart from the corresponding fourth section 24f.

[0117] The buffer member 5f is made of a polymer. Optionally, the buffer member 5f is made of a polymer such as foam or rubber. In Embodiment 6, the buffer member 5f is made of foam. The buffer member 5f uses the cushioning effect of the foam to prevent structural collapse and failure. The buffer member 5f can be used for position limiting and used as a buffer structure to prevent structure failure caused by excessive extrusion due to damages to the structure caused by excessively large pressure on the piezoelectric vibrator 600, thereby improving the reliability of the piezoelectric vibrator 600.

Embodiment 7

[0118] Embodiment 7 of the present disclosure provides a piezoelectric vibrator 700.

[0119] The piezoelectric vibrator 700 in Embodiment 7 of the present disclosure is basically the same as the piezoelectric vibrator 100 in Embodiment 1 of the present disclosure. The piezoelectric vibrator 700 in Embodiment 7 of the present disclosure is different from the piezoelectric vibrator 100 in Embodiment 1 of the present disclosure as follows.

[0120] Referring to FIG. 16, specifically, three amplifying units 2h are provided and are respectively a first amplifying unit 201h, a second amplifying unit 202h, and a third amplifying unit 203h. The three amplifying units 2h are all located on a same side of the piezoelectric body 1h and jointly form a three-layer elastic element structure. The first amplifying unit 201h and the second amplifying unit 202h are connected side by side. The third section 23h1 of the first amplifying unit 201h and the third section 23h2 of the second amplifying unit 202h formed into one piece, that means the third section 23h1 and the third section 23h2 are made of a same metal sheet. The sixth section 26h1 of the first amplifying unit 201h and the sixth section 26h2 of the second amplifying unit 202h formed into one piece, that means the sixth section 26h1 and the sixth section 26h2 are made of a same metal sheet. The third amplifying unit 203h is arranged on a side of the first amplifying unit 201h and the second amplifying unit 202h away from the piezoelectric body 1h. The first section 21h3 of the third amplifying unit 203h, the sixth section 26h1 of the first amplifying unit 201h, and the sixth section 26h2 of the second amplifying unit 202h are all made of a same metal sheet. The two second sections 22h3 of the third amplifying unit 203h are respectively the fifth sections 25h1 extending from the connected sixth sections 26h1 of the first amplifying unit 201h and the second amplifying unit 202h. The two third sections 23h3 of the third amplifying unit 203h are respectively the fourth section 24h1 of the first amplifying unit 201h and the fourth section 24h2 of the second amplifying unit 202h. The two sixth sections 26h3 of the third amplifying unit 203h are attached and fixed to the fourth section 24h1 of the first amplifying unit 201h and the fourth section 24h2 of the second amplifying unit 202h respectively. The amplifying unit 2h in the overall structure of the piezoelectric vibrator 700 adopts a design of a three-layer elastic element structure, which can further increase a displacement amplification factor. The three-layer elastic element structure is in a same piezoelectric body 1h. Based on parallel distribution of two-layer prismatic amplification structures, a third layer of the elastic reinforcing element may be arranged thereon, thereby forming a multi-layer amplifying structure. The three-layer elastic element structure has a larger displacement amplification factor, which is a sum of amplification factors of the three elastic reinforcing element layers.

[0121] In Embodiment 7, the three-layer elastic element structure may be designed in one piece by pre-tensioning and glue-free fixing.

[0122] In order to increase the amplification factor of the amplifying unit 2h, the piezoelectric vibrator 700 in Embodiment 7 of the present invention is structurally the same as the piezoelectric vibrator 100 in Embodiment 1 of the present invention, in which two amplifying units 2c are provided and the two amplifying units 2c are respectively located on two opposite sides of the piezoelectric body 1h.

Embodiment 8

[0123] Embodiment 8 of the present disclosure provides a piezoelectric vibrator assembly 800.

[0124] The piezoelectric vibrator assembly 800 includes any one of at least two piezoelectric vibrators 100, two piezoelectric vibrators 200, two piezoelectric vibrators 300, two piezoelectric vibrators 400, two piezoelectric vibrators 500, two piezoelectric vibrators 600, and two piezoelectric vibrators 700. The piezoelectric vibrator assembly 800 can enhance strength of a piezoelectric motor.

[0125] Referring to FIG. 17, in Embodiment 8, the piezoelectric vibrator assembly 800 includes at least two piezoelectric vibrators 100. The two piezoelectric vibrators 100 are stacked and connected along the second direction Yg. The fourth sections 24g in adjacent amplifying units 2g of the two piezoelectric vibrators 100 are attached and fixed.

[0126] When the two piezoelectric vibrators 100 are superimposed, piezoelectric displacement can be amplified to the greatest extent, and an overall amplification factor is a product of amplification factors of the two.

[0127] When the two piezoelectric vibrators 100 are stacked, only middle parts of the amplifying units 2g are required to be welded or bonded.

[0128] Compared with the related art, according to the piezoelectric vibrator and the piezoelectric vibrator assembly of the present disclosure, a piezoelectric body is provided, and at least one of two opposite sides of the piezoelectric body is provided with an amplifying unit fixedly supported thereon. The piezoelectric body is made of a single-layer or multi-layer material with a piezoelectric effect. When the piezoelectric body is subjected to an external voltage, due to an inverse piezoelectric effect, the piezoelectric body contracts or expands along a first direction parallel to a plane of the piezoelectric body. Since the amplifying unit is a flat structure formed by an elastic reinforcing element and having a same shape as the piezoelectric body and the elastic reinforcing element is a metal sheet, the amplifying unit contracts or expands along the second direction simultaneously. The first direction and the second direction are perpendicular to each other. The structure alleviates the problem of small response displacement or requirement of a high stimulus voltage of the piezoelectric body, so that the piezoelectric vibrator and the piezoelectric vibrator assembly of the present disclosure have a small volume, fast response, an adjustable resonance frequency, a wide operating frequency, and high energy conversion efficiency.

[0129] The above are only embodiments of the present disclosure and not thus intended to limit the patent scope of the present disclosure. All equivalent structures or equivalent flow transformations made by virtue of contents of the specification and the drawings of the present disclosure or direct or indirect application of the contents to the other related technical fields shall fall within the patent protection scope of the present disclosure.