A piezoelectric ceramic wafer with multi-point resonance and its application

Abstract

The present invention discloses a multi-point resonant piezoelectric ceramic chip and its application. The multi-point resonant piezoelectric ceramic chip comprises a piezoelectric ceramic sheet, the front of which is provided with a central electrode region, a central electrode connecting line, an electrode closed curve region, and regional electrode connecting lines; the regional electrode connecting lines are lines of arbitrary shapes; the electrode closed curve regions are connected to each other by the regional electrode connecting lines to form a whole; and the back of the piezoelectric ceramic sheet is entirely coated with a back electrode region. By providing multiple electrode regions on a piezoelectric ceramic sheet and connecting them together by electrode connecting lines to form a whole, the present invention achieves the effect of generating multiple vibration centers in a single chip. Furthermore, the vibration of each electrode region can be controlled by changing the size, shape, material, and other factors of the electrode regions and electrode connecting lines according to usage requirements, thereby achieving various functions.

Description

Technical Field

[0001] The present invention relates to the field of transducer piezoelectric ceramics, in particular to a multi-point resonance piezoelectric ceramic wafer and applications thereof. Background Art

[0002] Currently, ultrasonic transducers on the market are generally driven by piezoelectric ceramic chips. The piezoelectric ceramic chip uses a piezoelectric ceramic sheet as the main body, and electrode materials are coated on both sides as the positive and negative poles of the piezoelectric ceramic. When the positive and negative poles are energized, the piezoelectric ceramic will produce a piezoelectric effect, causing the piezoelectric ceramic to vibrate.

[0003] Between the piezoelectric ceramic crystal and the electrode, the resistance of the piezoelectric ceramic crystal is much greater than that of the electrode material, so the current will preferentially flow to the electrode between the piezoelectric ceramic and the electrode, and will only flow to the piezoelectric ceramic when the electrode is fully charged.

[0004] Most existing piezoelectric ceramic wafers have only one vibration center due to the limitations of the piezoelectric ceramic's own properties. Their vibration intensity is small, their working efficiency is low, and they cannot make good use of energy. Some existing piezoelectric ceramic wafers with multiple vibration centers are actually not completely the same because the shape and size of each electrode and the distance between each electrode are not exactly the same. As a result, the time it takes for each area to be filled with charge and then flow to the piezoelectric ceramic to vibrate is different, resulting in a phase difference and unable to achieve true synchronous vibration. This makes the vibration of the ultrasonic transducer uncontrollable and cannot meet the various needs of users. Summary of the Invention

[0005] The purpose of the present invention is to provide a piezoelectric ceramic crystal with multi-point resonance and its application, aiming to solve the defect in the prior art that a piezoelectric ceramic chip can only produce one vibration center. The shape, number, size, position, material and other factors of the electrode area can be adjusted according to actual use requirements to control the vibration time to achieve the effect of synchronous vibration or realize other functions, thereby reducing the processing requirements of the electrode area and saving costs.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A multi-point resonant piezoelectric ceramic wafer comprises a piezoelectric ceramic sheet, the front surface of which is provided with a central electrode region, a central electrode connecting line, an electrode closed curve region, and a regional electrode connecting line; the regional electrode connecting line is a line of arbitrary shape; one end of the central electrode connecting line is connected to the central electrode region, and the other end is connected to the electrode closed curve region; the electrode closed curve regions are connected to each other via the regional electrode connecting line to form a whole; the entire back surface of the piezoelectric ceramic sheet is coated with a back electrode region.

[0008] Preferably, the number of the electrode closed curve regions is at least two.

[0009] Preferably, the thickness of the central electrode connecting line, the length of the central electrode connecting line, the area of the electrode closed curve region, and the angle between adjacent electrode closed curve regions are all independent of each other.

[0010] Preferably, the central electrode connecting line is a straight line.

[0011] Preferably, the central electrode region, the central electrode connecting line, the electrode closed curve region, the regional electrode connecting line and the back electrode region are made of a metal material having a resistance value smaller than that of the piezoelectric ceramic sheet.

[0012] Preferably, the shape of the electrode closed curve region is an arbitrary closed curve shape.

[0013] Preferably, the arrangement and combination shape of the at least two electrode closed curve regions and the shape of any electrode closed curve region connected to the electrode connecting line are arbitrary shapes.

[0014] The present invention also provides a piezoelectric driven multi-point resonance transducer, which comprises the above-mentioned multi-point resonance piezoelectric ceramic chip and a metal sheet, wherein the front surface of the piezoelectric ceramic chip is connected to the back surface of the metal sheet.

[0015] Preferably, a metal vibration region matching the electrode closed curve region on the piezoelectric ceramic wafer is provided on the front surface of the metal sheet.

[0016] Preferably, the metal vibration area is in the shape of a pit.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) By setting multiple electrode closed curve areas on a single surface and stimulating vibration through a single power supply, multiple vibration centers are achieved, which improves the vibration intensity and energy utilization, enhances work efficiency and saves electricity costs.

[0019] (2) The closed curve areas of each electrode are connected to each other through electrode connecting lines to form a whole, so that each vibration area can vibrate at the same frequency. Compared with coating the entire surface with electrode materials, the amount of electrode material used is saved, which saves costs.

[0020] (3) Due to the effect of the electrode connecting wire, the processing requirements for the size, shape, and position distance of the closed curve area of each electrode are reduced, thereby improving processing efficiency and reducing processing costs.

[0021] (4) According to the different functions to be realized, the shape, number, size, position, material and other factors of the closed curve area of each electrode on the front side are set to control the position and vibration time of the vibration area to meet the various usage requirements of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a schematic diagram of the front structure of a piezoelectric ceramic crystal;

[0024] Figure 2 This is a schematic diagram of the power connection of the piezoelectric ceramic crystal;

[0025] Figure 3 It is a charge flow diagram when a closed curve area of a certain electrode on the front of the piezoelectric ceramic crystal is full of charge;

[0026] Figure 4 This is a schematic diagram of the piezoelectric ceramic crystal when all electrode closed curve areas are fully charged;

[0027] Figure 5 A schematic structural diagram of another embodiment of the present invention;

[0028] Figure 6 A schematic structural diagram of another embodiment of the present invention;

[0029] Figure 7 Schematic diagram of the structure of a piezoelectric driven multi-point resonant transducer;

[0030] Figure 8 Front view of a piezoelectrically driven multi-point resonant transducer.

[0031] In the accompanying drawings: 1- piezoelectric ceramic sheet, 11- central electrode area, 12- central electrode connecting line, 13- electrode closed curve area, 14- regional electrode connecting line, 15- back electrode area, 2- metal sheet, 21- metal vibration area, 3- circuit, 4- AC power supply. DETAILED DESCRIPTION

[0032] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0033] The following describes the embodiments of the present disclosure through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0034] Example 1

[0035] like Figures 1 to 4 A multi-point resonant piezoelectric ceramic wafer is shown, comprising a piezoelectric ceramic sheet 1, the front surface of which is coated with a central electrode region 11, a central electrode connecting line 12, an electrode closed curve region 13, and a regional electrode connecting line 14; the regional electrode connecting line 14 is a line of arbitrary shape; one end of the central electrode connecting line 12 is connected to the central electrode region 11, and the other end is connected to the electrode closed curve region 13; the electrode closed curve regions 13 are connected to each other via the regional electrode connecting line 14 to form a whole; the entire back surface of the piezoelectric ceramic sheet 1 is coated with a back electrode region 15. In a specific embodiment, the number of central electrode region 11, central electrode connecting line 12, and regional electrode connecting line 14 is at least one, and the number of electrode closed curve regions is at least two.

[0036] like Figure 1 and Figure 2 As shown, the front and back surfaces of the piezoelectric ceramic sheet 1 are coated with electrode materials as positive and negative poles. When the AC power supply 4 is turned on, the charge flows to the electrode coating area through the circuit 3. When the front side of the piezoelectric ceramic sheet 1 is connected to the power supply, the charge first fills the central electrode area 11 and then flows to the electrode closed curve area 13 through the central electrode connecting line 12.

[0037] like Figure 3As shown, in actual use, due to machining precision errors, the thickness and length of each center electrode connecting line 12, the area of each electrode closed curve region 13, and the angle between two adjacent electrode closed curve regions 13 cannot be completely consistent. This results in different times for each electrode closed curve region 13 to be filled with charge. Because the resistance of the piezoelectric ceramic is greater than that of the electrode material, charge tends to flow to areas with lower resistance. The first electrode closed curve region 13 to be filled with charge will then flow to the next adjacent electrode closed curve region 13 through its connected regional electrode connecting line 14. Ultimately, all electrode closed curve regions 13 are simultaneously filled with charge, and then flow to the piezoelectric ceramic 1, "breaking through" the piezoelectric ceramic 1, generating a piezoelectric effect and achieving synchronous vibration in multiple regions. The regional electrode connecting line 14 is a line of any shape, preferably an arc in this embodiment. In addition, because the regional electrode connecting line 14 is a very narrow connecting line, the thickness of the regional electrode connecting line 14 is exaggerated in the figure for better illustration, and it has no effect on the regional vibration. In a specific embodiment, assuming that the length of the central electrode connection line R1>R2, the time it takes for the charge to fill the electrode closed curve area connected to R1 is longer than the time it takes for the electrode closed curve area connected to R2. When the electrode closed curve area connected to R2 is full of charge, the charge will flow to the regional electrode connection line 12 between the two areas, and then flow to the electrode closed curve area connected to R1, and flow to the electrode closed curve area connected to R1. Figure 3 As shown by the arrows, the electrode closed curve region 13 connected by R1 and R2 is finally filled with charge at the same time; similarly, when the area of the two electrode closed curve regions S1>S2 or the angle θ1 between the two electrode closed curve regions>θ2, the charge flow direction and the charging principle of each electrode closed curve region 13 are the same as the above situation; the same frequency vibration of other electrode closed curve regions 13 also applies to the same principle.

[0038] Furthermore, the thickness and length of the central electrode connecting line 12, the area of the electrode closed curve region 13, and the angle between adjacent electrode closed curve regions 13 are all independent of each other. Because each electrode closed curve region 13 is connected by the regional electrode connecting line 14 to form a whole, whether the thickness and length of each central electrode connecting line 12, the area of each electrode closed curve region 13, and the angle between adjacent electrode closed curve regions 13 are the same or different, each vibration region can achieve synchronous vibration, greatly reducing the machining precision requirements of the electrode coating region and saving machining costs.

[0039] Furthermore, the central electrode connecting line 12 is a straight line. The central electrode connecting line 12 is a straight line of any length or thickness, used to connect the central electrode area and each electrode closed curve area.

[0040] Furthermore, the central electrode region 11, central electrode connecting line 12, electrode closed curve region 13, regional electrode connecting line 14, and back electrode region 15 are formed of a metal material having a lower resistance than the piezoelectric ceramic sheet 1. The central electrode region 11, central electrode connecting line 12, electrode closed curve region 13, regional electrode connecting line 14, and back electrode region 15 are formed of at least one of the following metal materials with a lower resistance than the piezoelectric ceramic sheet 1: silver, copper, aluminum, titanium, etc. In this embodiment, a silver coating is preferred. Different metal materials have different resistances. The cross-sectional area, length, and conductivity of the conductive material all affect the resistance of the conductive material. Different electrode materials are selected according to actual conditions. By changing the resistance value, the time it takes to fully charge and thus the vibration time can be controlled to achieve various functions.

[0041] Furthermore, the shape of the electrode closed curve region 13 is any closed curve shape. The shape of the electrode closed curve region 13 can be changed according to actual use requirements to achieve different functions without affecting the final frequency resonance effect. In this embodiment, a circular shape is preferred.

[0042] Furthermore, the arrangement and combination of the at least two electrode closed curve regions 13, and the shape of the connection between any electrode closed curve region 13 and the regional electrode connecting line 14, can be any shape. The arrangement and combination of the electrode closed curve regions 13, or the shape of the connection between them and the regional electrode connecting line 14, can be changed according to actual use requirements to achieve different functions without affecting the final frequency resonance effect. In this embodiment, a circular shape is preferred.

[0043] Example 2

[0044] like Figure 5 As shown, its structure is the same as that of Example 1, except that its regional electrode connecting line 14 is a straight line, and the shape of the connection combination of the electrode closed curve area 13 and the regional electrode connecting line 14 is a rectangle. Its function and working principle are consistent with those described in Example 1.

[0045] Example 3

[0046] like Figure 6 As shown, its structure is the same as that of Example 1, except that the shape of its electrode closed curve area 13 is elliptical, the number of electrode closed curve areas 13 is three, the regional electrode connecting line 14 is a straight line, and the figure of the connection combination of the electrode closed curve area 13 and the regional electrode connecting line 14 is a triangle. Its function and working principle are consistent with those described in Example 1.

[0047] Example 4

[0048] like Figures 7 and 8The piezoelectric driven multi-point resonant transducer shown comprises the above-mentioned multi-point resonant piezoelectric ceramic wafer and a metal sheet 2 , wherein the front surface of the piezoelectric ceramic wafer is connected to the back surface of the metal sheet 2 .

[0049] During use, the operator first applies the liquid that needs to be atomized and absorbed in the metal vibration area 21, turns on the power, and the piezoelectric ceramic chip forms multiple vibration areas, driving the metal vibration area 21 in the metal sheet 2 to vibrate, thereby refining the liquid in the metal vibration area 21, which helps the skin absorb and achieve a beauty effect.

[0050] Furthermore, a metal vibration area matching the electrode closed curve area on the piezoelectric ceramic wafer is provided on the front surface of the metal sheet.

[0051] Furthermore, the metal vibration area is in a pit shape.

[0052] In the description of the present invention, it should be understood that the terms "middle", "length", "upper", "lower", "front", "back", "vertical", "horizontal", "inner", "outer", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship 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 operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0053] In the present invention, unless otherwise expressly specified or limited, a first feature "on" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. "Multiple" means at least two, such as two or three, unless otherwise expressly specified or limited.

[0054] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0055] The above is only for explaining the embodiments of the present invention and is not intended to limit the present invention. For those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention without creative work should be included in the scope of protection of the present invention.

Claims

1. A multi-point resonant piezoelectric ceramic chip, characterized in that: It comprises a piezoelectric ceramic sheet, the front of which is provided with a central electrode area, a central electrode connecting line, an electrode closed curve area and a regional electrode connecting line; the regional electrode connecting line is a line of any shape; one end of the central electrode connecting line is connected to the central electrode area, and the other end is connected to the electrode closed curve area; the electrode closed curve areas are connected to each other through the regional electrode connecting line to form a whole; the entire back surface of the piezoelectric ceramic sheet is coated with a back electrode area; the central electrode area, central electrode connecting line, electrode closed curve area, regional electrode connecting line and back electrode area are made of a metal material with a resistance value lower than that of the piezoelectric ceramic sheet.

2. The multi-point resonant piezoelectric ceramic chip according to claim 1, characterized in that: The number of the electrode closed curve regions is at least two.

3. The multi-point resonant piezoelectric ceramic chip according to claim 2, characterized in that: The thickness of the central electrode connecting line, the length of the central electrode connecting line, the area of the electrode closed curve region, and the angle between adjacent electrode closed curve regions are all independent of each other.

4. The multi-point resonant piezoelectric ceramic chip according to claim 1, characterized in that: The central electrode connecting line is a straight line.

5. The multi-point resonant piezoelectric ceramic chip according to claim 1, characterized in that: The shape of the electrode closed curve region is any closed curve shape.

6. The multi-point resonant piezoelectric ceramic chip according to claim 3, characterized in that: The arrangement and combination shape of the at least two electrode closed curve regions and the shape of any electrode closed curve region connected to the electrode connecting line are arbitrary shapes.

7. A piezoelectric driven multi-point resonant transducer, characterized in that: The piezoelectric ceramic chip with multi-point resonance according to any one of claims 1 to 6 and a metal sheet, wherein the front surface of the piezoelectric ceramic chip and the back surface of the metal sheet are connected together.

8. The piezoelectric driven multi-point resonant transducer according to claim 7, characterized in that: A metal vibration area matching the electrode closed curve area on the piezoelectric ceramic wafer is provided on the front side of the metal sheet.

9. The piezoelectric driven multi-point resonant transducer according to claim 8, characterized in that: The metal vibration area is in a pit shape.

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