Piezoelectric ceramic and preparation method thereof

Abstract

The invention discloses piezoelectric ceramic and a preparation method thereof, and the piezoelectric ceramic comprises a vibration feedback unit which is used for deforming under the action of an electric signal to realize a vibration feedback function; the sensing and positioning unit is arranged at the top or the bottom of the vibration feedback unit, the sensing and positioning unit is divided into a plurality of sensing areas, and when any sensing area is pressed, an electric signal is generated and a pressing position on the sensing area is positioned. According to the piezoelectric ceramic, the sensing and positioning unit is integrated on the vibration feedback unit, the sensing and positioning unit can be divided into a plurality of sensing areas, the direct piezoelectric effect, the inverse piezoelectric effect and the positioning function are achieved on the same ceramic structure, and it is guaranteed that the piezoelectric ceramic can achieve the positioning, sensing and feedback functions.

Description

Technical Field

[0001] The present invention relates to the technical field of piezoelectric product manufacturing, and more particularly to a piezoelectric ceramic and a preparation method thereof. Background Art

[0002] Piezoelectric ceramics exhibit both direct and inverse piezoelectric effects. Applying pressure to a piezoelectric ceramic generates electrical signals at its positive and negative terminals, a phenomenon known as the direct piezoelectric effect. Applying a voltage across the terminals causes the ceramic to expand and contract, a phenomenon known as the inverse piezoelectric effect.

[0003] However, existing piezoelectric ceramics cannot simultaneously exhibit both direct piezoelectric effect and inverse piezoelectric effect, that is, it is impossible to simultaneously realize positioning perception and feedback functions on one ceramic. Summary of the Invention

[0004] One object of the present invention is to provide a new technical solution for piezoelectric ceramics and their preparation methods, which can at least solve the problem that existing piezoelectric ceramics cannot simultaneously realize positioning perception and feedback functions on one ceramic.

[0005] In a first aspect of the present invention, a piezoelectric ceramic is provided, comprising: a vibration feedback unit, which is configured to deform under the action of an electrical signal to achieve a vibration feedback function; a sensing and positioning unit, which is arranged at the top or bottom of the vibration feedback unit, and is divided into multiple sensing areas. When any one of the sensing areas is pressed, the sensing and positioning unit generates an electrical signal and locates the pressed position on the sensing area.

[0006] Optionally, the vibration feedback unit includes a multilayer piezoelectric ceramic body, which includes a plurality of piezoelectric ceramic layers stacked in sequence, and an electrode layer is provided between adjacent piezoelectric ceramic layers, and the electrode layer is used to apply an electrical signal to deform the vibration feedback unit.

[0007] Optionally, the vibration feedback unit further includes a side electrode, which is provided on a side of the multilayer piezoelectric ceramic body and is used to lead out a positive electrode and a negative electrode of the multilayer piezoelectric ceramic body.

[0008] Optionally, the sensing and positioning unit includes a plurality of piezoelectric ceramic sheets, which are arranged on the top or bottom of the vibration feedback unit, and each piezoelectric ceramic sheet corresponds to one sensing area.

[0009] Optionally, the sensing and positioning unit further includes a top electrode and a bottom electrode, the top electrode is arranged on the top of the piezoelectric ceramic sheet, and the bottom electrode is arranged on a side of the piezoelectric ceramic sheet facing the vibration feedback unit.

[0010] Optionally, the vibration feedback unit is a long strip structure, and the sensing and positioning unit covers the top or bottom area of the vibration feedback unit.

[0011] Optionally, the plurality of sensing areas in the sensing positioning unit are arranged in a row along a first direction and a second direction, and the sensing positioning unit determines the position of the pressed sensing area in the first direction or the second direction by combining electrical signals of different sensing areas.

[0012] Optionally, the sensing and positioning unit includes a multilayer structure, the multilayer structure includes a bottom electrode, a middle ceramic layer and a top electrode, the middle ceramic layer is divided into a plurality of sensing areas, and the plurality of sensing areas are distributed in an array in the first direction and the second direction.

[0013] A second aspect of the present invention provides a method for preparing a piezoelectric ceramic, which is used to prepare the piezoelectric ceramic described in the above embodiment, and the preparation method comprises:

[0014] A multilayer piezoelectric ceramic body is manufactured by laminating cast film strips or dry pressing, and side electrodes are provided on the sides of the multilayer piezoelectric ceramic body to form a vibration feedback unit;

[0015] A piezoelectric ceramic sheet is manufactured by tape casting or dry pressing, and electrodes are provided on the piezoelectric ceramic sheet to form a sensing and positioning unit;

[0016] The sensing and positioning unit is arranged on the top or bottom of the vibration feedback unit to prepare the piezoelectric ceramic.

[0017] Optionally, the step of forming the vibration feedback unit further includes:

[0018] Different electrode patterns are printed on the cast film to form a piezoelectric ceramic soft blank with positive and negative polarity;

[0019] The piezoelectric ceramic soft blanks are stacked.

[0020] Optionally, the step of forming the sensing and positioning unit further includes:

[0021] Making piezoelectric ceramic sheets on the cast film tape and printing electrodes;

[0022] Cutting and silver burning are carried out.

[0023] The piezoelectric ceramic of this invention integrates a sensing and positioning unit into a vibration feedback unit. This sensing and positioning unit can be divided into multiple sensing areas, achieving direct piezoelectric effect, inverse piezoelectric effect, and positioning function within the same ceramic structure, ensuring that the piezoelectric ceramic can achieve both positioning sensing and feedback functions. The piezoelectric ceramic has an ingenious overall design, a simple structure, and features a minimal number of parts and a compact design.

[0024] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0026] Figure 1 is a schematic structural diagram of a piezoelectric ceramic according to embodiment 1 of the present invention;

[0027] Figure 2 is a structural diagram of a vibration feedback unit according to a first embodiment of the present invention;

[0028] Figure 3 is a schematic structural diagram of a bottom electrode according to a first embodiment of the present invention;

[0029] Figure 4 is a schematic structural diagram of a negative electrode according to embodiment 1 of the present invention;

[0030] Figure 5 is a schematic structural diagram of a positive electrode according to embodiment 1 of the present invention;

[0031] Figure 6 is a structural diagram of a sensing and positioning unit according to Embodiment 1 of the present invention;

[0032] Figure 7 is a schematic structural diagram of a piezoelectric ceramic according to a second embodiment of the present invention;

[0033] Figure 8 is a structural diagram of a vibration feedback unit according to a second embodiment of the present invention;

[0034] Figure 9 is a structural diagram of a sensing and positioning unit according to Embodiment 2 of the present invention;

[0035] Figure 10 FIG. 4 is another structural diagram of a sensing and positioning unit according to the second embodiment of the present invention.

[0036] Reference numerals:

[0037] Vibration feedback unit 10; piezoelectric ceramic body 11; positive electrode 12; negative electrode 13; bottom electrode 14; side electrode 15;

[0038] Sensing and positioning unit 20 ; piezoelectric ceramic sheet 21 ; multilayer structure 22 ; bottom electrode 221 ; middle ceramic layer 222 ; top electrode 223 ; sensing area 25 . DETAILED DESCRIPTION

[0039] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention.

[0040] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0041] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0042] In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0043] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0044] In the specification and claims of the present invention, references to features using the terms "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more. Furthermore, in the specification and claims, "and / or" refers to at least one of the connected entities, and the character " / " generally indicates an "or" relationship between the connected entities.

[0045] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0046] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, these terms may refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0047] The piezoelectric ceramic according to the embodiment of the present invention is described in detail below with reference to the accompanying drawings.

[0048] like Figure 1 and Figure 7 As shown, the piezoelectric ceramic according to the embodiment of the present invention includes a vibration feedback unit 10 and a sensing and positioning unit 20 .

[0049] Specifically, the vibration feedback unit 10 is configured to deform in response to an electrical signal to implement the vibration feedback function. The sensing and positioning unit 20 is disposed at the top or bottom of the vibration feedback unit 10. The sensing and positioning unit 20 is divided into a plurality of sensing areas 25. When any sensing area 25 is pressed, the sensing and positioning unit 20 generates an electrical signal and locates the pressed position of the sensing area 25.

[0050] In other words, see Figure 1 and Figure 7 According to the embodiment of the present invention, the piezoelectric ceramic mainly comprises a vibration feedback unit 10 and a sensing positioning unit 20. Figure 2 and Figure 8 As shown, the vibration feedback unit 10 is mainly used to deform under the action of an electrical signal, thereby realizing the vibration feedback function. When an electrical signal is applied to the vibration feedback unit 10, the piezoelectric ceramic can produce expansion and contraction deformation, converting electrical energy into mechanical energy (i.e., the inverse piezoelectric effect of the piezoelectric ceramic). Figure 6 and Figure 9 As shown, the sensing and positioning unit 20 can be set at the top or bottom of the vibration feedback unit 10. The sensing and positioning unit 20 is divided into multiple sensing areas 25 and is connected to the outside using a connector. When pressing on different sensing areas 25, the sensing area 25 generates an electrical signal, which is output to the outside through the connector for analysis and positioning, so that the pressed area can be identified. While identifying the corresponding pressed sensing area 25, the external drive outputs an electrical signal to the vibration part of the piezoelectric ceramic, causing the piezoelectric ceramic to vibrate. Therefore, when pressing force is applied to the surface of the sensing and positioning unit 20 of the piezoelectric ceramic, the piezoelectric ceramic generates an electrical signal to convert mechanical energy into electrical energy. And when pressing different sensing areas 25 in the sensing and positioning unit 20, the pressing position of the sensing area 25 where the pressure is applied can be accurately identified and located.

[0051] Thus, according to the piezoelectric ceramic of the embodiment of the present invention, the sensing and positioning unit 20 is integrated into the vibration feedback unit 10, and the sensing and positioning unit 20 can be divided into multiple sensing areas 25. The direct piezoelectric effect, the inverse piezoelectric effect, and the positioning function are realized in the same ceramic structure, ensuring that the piezoelectric ceramic can realize the positioning sensing and feedback functions. The overall design of the piezoelectric ceramic is ingenious, the structure is simple, and it has the design characteristics of few parts and miniaturization.

[0052] According to one embodiment of the present invention, the vibration feedback unit 10 includes a multilayer piezoelectric ceramic body 11, which includes a plurality of piezoelectric ceramic layers stacked in sequence, and an electrode layer is provided between adjacent piezoelectric ceramic layers. The electrode layer is used to apply an electrical signal to deform the vibration feedback unit 10.

[0053] That is to say, if Figure 2 As shown, the vibration feedback unit 10 is mainly composed of a multilayer piezoelectric ceramic body 11, wherein the multilayer piezoelectric ceramic body 11 includes a plurality of piezoelectric ceramic layers stacked in sequence. The present invention can use a cast film tape stacking method to manufacture the multilayer piezoelectric ceramic body 11, and an electrode layer is provided between adjacent piezoelectric ceramic layers, such as Figures 3 to 5 As shown, the electrode layer includes a bottom electrode 14, a negative electrode 13, and a positive electrode 12. The electrode layer can be used to apply an electrical signal to deform the vibration feedback unit 10. The operating principle of the vibration feedback unit 10 is: applying a sine wave electrical signal to the piezoelectric ceramic, due to the inverse piezoelectric effect of the piezoelectric ceramic, the piezoelectric ceramic will produce expansion and contraction deformation in the length direction and the opposite width direction, causing the piezoelectric ceramic to vibrate.

[0054] According to one embodiment of the present invention, the vibration feedback unit 10 further includes a side electrode 15 . The side electrode 15 is disposed on a side of the multilayer piezoelectric ceramic body 11 . The side electrode 15 is used to lead out the positive and negative electrodes of the multilayer piezoelectric ceramic body 11 .

[0055] In other words, if Figure 1 and Figure 2 As shown, the vibration feedback unit 10 also includes a side electrode 15, which can be printed on the side of the multilayer piezoelectric ceramic body 11. The side electrode 15 is mainly used to lead out the positive and negative electrodes of the multilayer piezoelectric ceramic body 11 to form a multilayer piezoelectric ceramic embryo with positive and negative electrodes.

[0056] According to one embodiment of the present invention, the sensing and positioning unit 20 includes a plurality of piezoelectric ceramic sheets 21 , which are arranged on the top or bottom of the vibration feedback unit 10 , and each piezoelectric ceramic sheet 21 corresponds to a sensing area 25 .

[0057] That is to say, if Figure 1 and Figure 6As shown, the sensing and positioning unit 20 is mainly composed of a plurality of piezoelectric ceramic sheets 21, and the plurality of piezoelectric ceramic sheets 21 can be arranged at the top or bottom of the vibration feedback unit 10. Each piezoelectric ceramic sheet 21 can correspond to a sensing area 25. When the sensing area 25 of a different piezoelectric ceramic sheet 21 is pressed, the piezoelectric ceramic sheet 21 generates an electrical signal, which is output to the outside through the connection port for analysis and positioning, so that the pressed area can be identified. While identifying the corresponding pressed sensing area 25, the external drive outputs an electrical signal to the vibration part of the piezoelectric ceramic, causing the piezoelectric ceramic to vibrate. Therefore, when pressing force is applied to the surface of the piezoelectric ceramic sheet 21 of the piezoelectric ceramic, the piezoelectric ceramic generates an electrical signal, converting mechanical energy into electrical energy. And when pressing different sensing areas 25 in the sensing and positioning unit 20, the pressing position of the sensing area 25 where the pressure is applied can be accurately identified and located.

[0058] According to one embodiment of the present invention, the sensing and positioning unit 20 further includes a top electrode 223 and a bottom electrode 221 . The top electrode 223 is arranged on the top of the piezoelectric ceramic piece 21 , and the bottom electrode 221 is arranged on the side of the piezoelectric ceramic piece 21 facing the vibration feedback unit 10 .

[0059] That is to say, if Figure 10 As shown, the sensing and positioning unit 20 may further include a top electrode 223 and a bottom electrode 221, wherein the top electrode 223 is arranged on the top of the piezoelectric ceramic sheet 21, and the bottom electrode 221 is arranged on the side of the piezoelectric ceramic sheet 21 facing the vibration feedback unit 10. The top electrode 223 and the bottom electrode 221 in the sensing and positioning unit 20 can be output to the outside through the connection port for analysis and positioning, that is, the pressed area can be identified. When the corresponding pressed sensing area 25 is identified, the external drive outputs an electrical signal to the vibration part of the piezoelectric ceramic, causing the piezoelectric ceramic to vibrate.

[0060] According to one embodiment of the present invention, the vibration feedback unit 10 is a long strip structure, and the sensing and positioning unit 20 covers the top or bottom area of the vibration feedback unit 10. In other words, Figure 1 As shown, the vibration feedback unit 10 can be designed as a long strip structure, and the sensing and positioning unit 20 can cover the top or bottom area of the vibration feedback unit 10, realizing positioning perception at any position on the surface of the piezoelectric ceramic. In the present invention, the piezoelectric ceramic with integrated sensing and feedback can be a long strip structure, the vibration feedback unit 10 is arranged along the length direction, and the sensing and positioning unit 20 covers the top or bottom area of the vibration feedback unit 10. This structural design facilitates integration and application in some specific devices, such as a strip-shaped touch sensing module.

[0061] According to one embodiment of the present invention, the multiple sensing areas 25 in the sensing and positioning unit 20 are arranged in a row along the first direction and the second direction, and the sensing and positioning unit 20 determines the position of the pressed sensing area 25 in the first direction or the second direction by combining the electrical signals of different sensing areas 25.

[0062] That is to say, if Figure 7 and Figure 9 As shown, the plurality of sensing areas 25 in the sensing positioning unit 20 can be arranged in a row along a first direction and a second direction, wherein the first direction and the second direction can be understood as an X direction and a Y direction respectively (the first direction and the second direction refer to Figure 7 The sensing and positioning unit 20 determines the X / Y position of the pressed sensing area 25 by combining the electrical signals from different sensing areas 25. Pressing a specific area of the top piezoelectric ceramic can locate the area pressed by the finger. Furthermore, an external driver generates an electrical signal that acts on the feedback ceramic at the bottom, causing it to expand and contract, thus achieving vibration feedback.

[0063] According to one embodiment of the present invention, the sensing and positioning unit 20 includes a multilayer structure 22, which includes a bottom electrode 221, an intermediate ceramic layer 222 and a top electrode 223. The intermediate ceramic layer 222 is divided into a plurality of sensing areas 25, and the plurality of sensing areas 25 are distributed in an array in a first direction and a second direction.

[0064] In other words, if Figure 10 As shown, the sensing and positioning unit 20 is mainly composed of a multilayer structure 22, wherein the multilayer structure 22 includes a bottom electrode 221, an intermediate ceramic layer 222 and a top electrode 223. The intermediate ceramic layer 222 can be divided into a plurality of sensing areas 25, and the plurality of sensing areas 25 can be arrayed in the X / Y direction. The sensing and positioning unit 20 can determine the position of the pressed sensing area 25 in the X / Y direction by combining the electrical signals of different sensing areas 25. When a certain area of the top piezoelectric ceramic is pressed, the area pressed by the finger can be located, and under the action of an external driver, the electrical signal acts on the feedback ceramic at the bottom, causing the piezoelectric ceramic to produce expansion and contraction deformation, thereby realizing the vibration feedback function.

[0065] In the present invention, the piezoelectric ceramic with integrated sensor feedback has X / Y positioning capabilities. The sensor positioning unit 20 determines the X / Y position of the pressed area by combining electrical signals from different regions. The sensor positioning unit 20 comprises a multilayer structure 22, comprising a bottom electrode 221, a middle ceramic layer 222, and a top electrode 223. The middle ceramic layer 222 is divided into a plurality of sensing regions 25, which are arranged in an array in the X / Y directions. This allows for more precise positioning of the pressed area, making it suitable for applications requiring high positioning accuracy, such as high-precision touch screens.

[0066] In summary, the piezoelectric ceramic according to the embodiment of the present invention integrates the sensing and positioning unit 20 into the vibration feedback unit 10. Furthermore, the sensing and positioning unit 20 can be divided into multiple sensing areas 25. This achieves the direct piezoelectric effect, the inverse piezoelectric effect, and the positioning function within the same ceramic structure, ensuring that the piezoelectric ceramic can achieve both positioning sensing and feedback functions. This piezoelectric ceramic has an ingenious overall design, a simple structure, and features a minimal number of parts and a compact design.

[0067] Of course, for those skilled in the art, other structures and working principles of piezoelectric ceramics are understandable and achievable, and will not be described in detail in the present invention.

[0068] According to the second aspect of the present invention, Figures 1 to 10 As shown, a method for preparing a piezoelectric ceramic is provided, which is used to prepare the piezoelectric ceramic in the above embodiment. The preparation method includes:

[0069] The multilayer piezoelectric ceramic body 11 is manufactured by laminating cast film strips or dry pressing, and side electrodes 15 are provided on the sides of the multilayer piezoelectric ceramic body 11 to form the vibration feedback unit 10;

[0070] A piezoelectric ceramic sheet 21 is manufactured by tape casting or dry pressing, and electrodes are provided on the piezoelectric ceramic sheet 21 to form a sensing and positioning unit 20;

[0071] The sensing and positioning unit 20 is disposed on the top or bottom of the vibration feedback unit 10 to prepare a piezoelectric ceramic.

[0072] That is, see Figures 1 to 10, the preparation method of the piezoelectric ceramic according to the embodiment of the present invention is mainly used to prepare the piezoelectric ceramics in the above-mentioned embodiment. In the preparation method of the piezoelectric ceramic of the present invention, first, a multilayer piezoelectric ceramic body 11 can be made by laminating or dry pressing a cast film strip, and a side electrode 15 can be printed on the side of the multilayer piezoelectric ceramic body 11 to form a vibration feedback unit 10. Then, a piezoelectric ceramic sheet 21 can be made by casting or dry pressing, and an electrode is set on the piezoelectric ceramic sheet 21 to form a sensing and positioning unit 20. Finally, the sensing and positioning unit 20 can be superimposed on the top or bottom of the vibration feedback unit 10 to prepare a piezoelectric ceramic. The preparation method of the present invention has a simple process and strong operability. Both cast film strip lamination and dry pressing have a mature process basis and are easy to realize industrial production.

[0073] According to one embodiment of the present invention, the step of forming the vibration feedback unit 10 further includes:

[0074] Different electrode patterns are printed on the cast film to form a piezoelectric ceramic soft blank with positive and negative polarity;

[0075] The piezoelectric ceramic soft green sheets are stacked and arranged.

[0076] That is to say, if Figures 2 to 5 As shown, in the process of forming the vibration feedback unit 10, a printing process can be first used to print different electrode patterns on the cast ceramic film tape to form a piezoelectric ceramic blank with positive and negative polarity. Then, the piezoelectric ceramic blanks are stacked in a lamination manner, and side electrodes 15 are brushed on the sides to lead out the positive and negative electrodes of the piezoelectric ceramic, forming a multilayer piezoelectric ceramic body with positive and negative electrodes 13.

[0077] Of course, in another embodiment of the present invention, piezoelectric ceramics can be dry-pressed and sintered into piezoelectric ceramic blocks, and electrodes can be printed on both sides of the ceramic blocks. After printing is completed, multiple ceramic sheets are stacked and side electrodes 15 are printed to connect the positive and negative electrodes 13 of the multilayer piezoelectric ceramics to form a multilayer piezoelectric ceramic body 11.

[0078] According to one embodiment of the present invention, the step of forming the sensing and positioning unit 20 further includes:

[0079] Making a piezoelectric ceramic sheet 21 on the cast film tape and printing electrodes;

[0080] Cutting and silver burning are carried out.

[0081] That is to say, in the process of forming the sensing and positioning unit 20, a piezoelectric ceramic sheet 21 can be made on the cast film tape and the electrode can be printed. Then, after sintering, a small ceramic block is formed, and a top electrode is printed on the top of the ceramic sheet. After silver is fired, a small piezoelectric ceramic sheet 21 is formed.

[0082] In the method for preparing the piezoelectric ceramic of the present invention, Figure 1 and Figure 6 As shown, regarding the preparation of the vibration feedback unit 10, a multilayer piezoelectric ceramic structure can be produced by laminating cast film strips or dry pressing. When the cast film strip lamination method is adopted, a printing process is first used to print different electrode patterns on the cast ceramic film strip to form a piezoelectric ceramic soft blank with positive and negative polarity. The piezoelectric ceramic soft blank is then laminated according to a certain pattern so that the electrode layer and the piezoelectric ceramic layer are arranged alternately, and side electrodes 15 are printed on the side to form a multilayer piezoelectric ceramic blank with positive and negative electrodes 13. The multilayer piezoelectric ceramic blank is then subjected to isostatic pressing to make its structure more dense and uniform. It is then cut into the required size and shape. After that, debinding is performed to remove organic additives in the ceramic blank. Then sintering is performed to densify the ceramic blank and improve its performance. Finally, slicing is performed to obtain a vibration feedback unit 10 that meets the requirements.

[0083] When dry pressing is used, Figure 7 and Figure 8 As shown, piezoelectric ceramic raw materials are first dry-pressed into small piezoelectric ceramic blocks, which are then sintered to form a piezoelectric ceramic block with specific performance. Electrodes are then printed on both sides of the ceramic block. After printing, multiple ceramic sheets are stacked and side electrodes 15 are printed to connect the positive and negative electrodes 13 of the multilayer piezoelectric ceramics, forming a multilayer piezoelectric ceramic body 11, i.e., a vibration feedback unit 10.

[0084] Regarding the preparation of the sensing and positioning unit 20, the small piezoelectric ceramic sheet 21 can also be produced by casting or dry pressing. If casting is used, the small piezoelectric ceramic sheet 21 is produced on the cast ceramic film strip and the electrodes are printed. Then, subsequent processes such as cutting and silver firing are carried out to ensure that the small piezoelectric ceramic sheet 21 has good conductivity and stability, forming the sensing and positioning unit 20. If dry pressing is used, a small ceramic sheet is first dry pressed and formed. After sintering, a small ceramic block is formed. The top electrode is printed on the top of the ceramic sheet, and after silver firing, the small piezoelectric ceramic sheet 21 is formed to form the sensing and positioning unit 20.

[0085] Finally, the vibration feedback unit 10 and the sensor positioning unit 20 are combined. Specifically, the prepared sensor positioning unit 20 is placed on the top or bottom of the vibration feedback unit 10, and the two are connected together through silver sintering or other suitable connection methods. During the connection process, ensure that the electrical connection between the sensor positioning unit 20 and the vibration feedback unit 10 is good and the mechanical connection is firm, thus forming a sensor-feedback integrated piezoelectric ceramic with both sensing and feedback functions.

[0086] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A piezoelectric ceramic, characterized in that: include: A vibration feedback unit (10), the vibration feedback unit (10) being configured to deform under the action of an electrical signal to achieve a vibration feedback function; A sensing and positioning unit (20) is provided at the top or bottom of the vibration feedback unit (10), the sensing and positioning unit (20) is divided into a plurality of sensing areas (25), and when any one of the sensing areas (25) is pressed, an electrical signal is generated and a pressed position on the sensing area (25) is located.

2. The piezoelectric ceramic according to claim 1, characterized in that The vibration feedback unit (10) comprises a multilayer piezoelectric ceramic body (11), wherein the multilayer piezoelectric ceramic body (11) comprises a plurality of piezoelectric ceramic layers stacked in sequence, and an electrode layer is provided between adjacent piezoelectric ceramic layers, wherein the electrode layer is used to apply an electrical signal to deform the vibration feedback unit (10).

3. The piezoelectric ceramic according to claim 2, characterized in that: The vibration feedback unit (10) further includes a side electrode (15), wherein the side electrode (15) is provided on the side of the multilayer piezoelectric ceramic body (11), and the side electrode (15) is used to lead out the positive electrode and the negative electrode of the multilayer piezoelectric ceramic body (11).

4. The piezoelectric ceramic according to claim 1, wherein The sensing and positioning unit (20) comprises a plurality of piezoelectric ceramic sheets (21), wherein the plurality of piezoelectric ceramic sheets (21) are arranged on the top or bottom of the vibration feedback unit (10), and each of the piezoelectric ceramic sheets (21) corresponds to one of the sensing areas (25).

5. The piezoelectric ceramic according to claim 4, characterized in that The sensing and positioning unit (20) further includes a top electrode (223) and a bottom electrode (221), wherein the top electrode (223) is arranged on the top of the piezoelectric ceramic sheet (21), and the bottom electrode (221) is arranged on a side of the piezoelectric ceramic sheet (21) facing the vibration feedback unit (10).

6. The piezoelectric ceramic according to claim 1, wherein: The vibration feedback unit (10) is a long strip structure, and the sensing and positioning unit (20) covers the top or bottom area of the vibration feedback unit (10).

7. The piezoelectric ceramic according to claim 1, characterized in that The plurality of sensing areas (25) in the sensing positioning unit (20) are arranged in a row along a first direction and a second direction, and the sensing positioning unit (20) determines the position of the pressed sensing area (25) in the first direction or the second direction by combining electrical signals of different sensing areas (25).

8. The piezoelectric ceramic according to claim 7, characterized in that The sensing and positioning unit (20) comprises a multilayer structure (22), the multilayer structure (22) comprising a bottom electrode (221), an intermediate ceramic layer (222) and a top electrode (223), the intermediate ceramic layer (222) being divided into a plurality of sensing areas (25), the plurality of sensing areas (25) being distributed in an array in a first direction and a second direction.

9. A method for preparing a piezoelectric ceramic, for preparing the piezoelectric ceramic according to any one of claims 1 to 8, characterized in that: The preparation method comprises: A multilayer piezoelectric ceramic body (11) is manufactured by laminating cast film strips or dry pressing, and side electrodes (15) are provided on the sides of the multilayer piezoelectric ceramic body (11) to form a vibration feedback unit (10); A piezoelectric ceramic sheet (21) is manufactured by casting or dry pressing, and electrodes are provided on the piezoelectric ceramic sheet (21) to form a sensing and positioning unit (20); The sensing and positioning unit (20) is arranged on the top or bottom of the vibration feedback unit (10) to prepare the piezoelectric ceramic.

10. The method for preparing a piezoelectric ceramic according to claim 9, wherein: The step of forming the vibration feedback unit (10) further includes: Different electrode patterns are printed on the cast film to form a piezoelectric ceramic soft blank with positive and negative polarity; The piezoelectric ceramic soft blanks are stacked.

11. The method for preparing a piezoelectric ceramic according to claim 9, wherein: The step of forming the sensing and positioning unit (20) further includes: Making a piezoelectric ceramic sheet (21) on the cast film strip and printing electrodes; Cutting and silver burning are carried out.

Images