An ultrasonic wave unit and an ultrasonic wave beauty instrument

Abstract

This utility model relates to the field of beauty equipment technology, and provides an ultrasonic unit and an ultrasonic beauty instrument. The ultrasonic unit includes a housing, a piezoelectric ceramic sheet, a circuit board, and terminal wires. The piezoelectric ceramic sheet and the circuit board are spaced apart inside the housing, and one end of the terminal wire is electrically connected to the circuit board. A lead wire groove is provided on the inner side wall of the housing. One end of the lead wire groove extends to the side of the piezoelectric ceramic sheet facing away from the circuit board, and the other end of the lead wire groove extends towards the circuit board. A first wire is connected to the side of the piezoelectric ceramic sheet facing away from the circuit board. The first wire loops back into the housing through the lead wire groove and connects to the circuit board. A second wire is connected to the other side of the piezoelectric ceramic sheet and connects to the circuit board. This utility model overcomes the technical problem in existing ultrasonic units where the piezoelectric ceramic sheet itself blocks the opening of the housing, making it difficult for the wire located on the outside of the housing to connect to the circuit board on the inside of the housing.

Description

Technical Field

[0001] This utility model relates to the field of beauty equipment technology, and in particular to an ultrasonic unit and an ultrasonic beauty instrument. Background Technology

[0002] An ultrasonic beauty device is a skin care device that uses ultrasonic technology. Its principle is to generate ultrasonic waves through high-frequency vibrations. These waves can penetrate the skin to reach deep tissues, producing mechanical vibrations and thermal effects at corresponding locations. This promotes blood circulation, accelerates metabolism, enhances skin cell vitality, and facilitates the absorption of substances deep within the skin. Compared to traditional beauty techniques, ultrasonic beauty devices offer advantages such as non-invasive safety, wide applicability, and high comfort, and have been widely used in the beauty industry.

[0003] To generate ultrasound, existing ultrasonic beauty devices generally include a main unit and an ultrasonic unit. The ultrasonic unit includes a cylindrical shell with openings at both ends. Inside the shell, piezoelectric ceramic plates and circuit boards are arranged sequentially at intervals, with the piezoelectric ceramic plates positioned near one of the openings of the shell. The piezoelectric ceramic plates and circuit boards, as well as the circuit boards and the main unit, are electrically connected via wires and terminals. By inputting an electrical signal to the piezoelectric ceramic plates through the main unit, the piezoelectric ceramic plates can generate corresponding ultrasonic signals for treating the affected area.

[0004] However, piezoelectric ceramic sheets have positive and negative electrodes. Therefore, some existing piezoelectric ceramic sheets have wires connected to both the side facing the outside of the housing and the side facing the inside of the housing (one side is the positive electrode, and the other side is the negative electrode). To connect this type of piezoelectric ceramic sheet to a circuit board, it is necessary not only to connect the wire located inside the housing to the circuit board, but also to wrap the wire located outside the housing back inside the housing and then connect it to the circuit board. However, since the piezoelectric ceramic sheet itself blocks the opening of the housing, achieving the latter often requires wrapping the wire around the outside of the housing or making a hole in the housing, which can easily damage the sealing and appearance of the ultrasonic unit. Utility Model Content

[0005] The purpose of this invention is to overcome the technical problem in existing ultrasonic units where the piezoelectric ceramic sheet itself blocks the opening of the housing, making it difficult to connect the wires located on the outside of the housing to the circuit board on the inside of the housing, and to provide an ultrasonic unit and an ultrasonic beauty device.

[0006] In a first aspect, the present invention provides an ultrasonic unit, comprising a housing, a piezoelectric ceramic sheet, a circuit board, and terminal wires; the housing has openings at both ends, and the piezoelectric ceramic sheet and the circuit board are spaced apart within the housing along the axial direction of the housing, with the piezoelectric ceramic sheet positioned near one of the openings of the housing, and one end of the terminal wires electrically connected to the circuit board; a lead-wire groove is provided on the inner sidewall of the housing, the length of the lead-wire groove being set along the axial direction of the housing, one end of the lead-wire groove extending to the side of the piezoelectric ceramic sheet facing away from the circuit board, and the other end of the lead-wire groove extending towards the circuit board; a first wire is connected to the side of the piezoelectric ceramic sheet facing away from the circuit board, and the first wire loops back into the housing through the lead-wire groove and connects to the circuit board; a second wire is connected to the other side of the piezoelectric ceramic sheet, and the second wire is connected to the circuit board.

[0007] The ultrasonic unit of this solution has a lead wire groove on the inner wall of the housing, and the two ends of the lead wire groove lead to the side of the piezoelectric ceramic sheet away from the circuit board and the inner side of the housing, respectively. By inserting the first wire of the piezoelectric ceramic sheet into the lead wire groove, the first wire can be turned from the outside of the housing to the inside of the housing, and thus be successfully connected to the circuit board.

[0008] Furthermore, this solution requires minimal modification to the housing and will not affect the fit between the piezoelectric ceramic sheet and the housing, ensuring a good sealing effect between the piezoelectric ceramic sheet and the housing. At the same time, the lead groove can also provide a certain degree of limitation and protection for the first lead wire, which is beneficial to improving the appearance of this ultrasonic unit and increasing the service life of the first lead wire.

[0009] Preferably, a wire-passing hole is provided between the sidewall of the circuit board and the inner sidewall of the housing, and the first wire and the second wire both pass through the wire-passing hole and are connected to the side of the circuit board away from the piezoelectric ceramic sheet.

[0010] This solution provides a wire-passing hole between the side wall of the circuit board and the inner side wall of the housing, allowing both the first and second wires to pass through the wire-passing hole and wrap around to the side of the circuit board away from the piezoelectric ceramic sheet. This allows operators to connect the first wire to the circuit board and the second wire to the circuit board in a wider operating space, thereby improving the efficiency and quality of the corresponding connection operations.

[0011] Preferably, the piezoelectric ceramic sheet is a curved ceramic sheet, and the focal point of the piezoelectric ceramic sheet is located on the side of the piezoelectric ceramic sheet away from the circuit board.

[0012] This solution can focus the ultrasonic energy generated by the piezoelectric ceramic sheet at the focal point of the curved ceramic sheet, thereby increasing the intensity of the ultrasonic signal under the same input electrical signal.

[0013] Preferably, the number of first conductors is at least two.

[0014] Since the first wire is connected to the side of the piezoelectric ceramic sheet away from the circuit board, that is, the side of the piezoelectric ceramic sheet facing the outside of the housing, the first wire is more prone to defects such as breakage and desoldering and failure in actual use compared to the second wire. This solution connects at least two first wires to the piezoelectric ceramic sheet, and the first wires can serve as backups for each other. Even if one of the first wires fails, the other first wires can still transmit electrical signals between the circuit board and the piezoelectric ceramic sheet, thereby improving the reliability of this solution.

[0015] Preferably, the first wires are distributed at intervals along the circumference of the piezoelectric ceramic sheet, and the number and position of the lead slots match the number and position of the first wires.

[0016] This design distributes the first conductors along the circumference of the piezoelectric ceramic sheet, which reduces the probability that multiple first conductors will fail simultaneously due to external interference at a certain point on the piezoelectric ceramic sheet.

[0017] Preferably, a limiting protrusion is provided on one of the inner sidewall of the housing and the sidewall of the circuit board, and a limiting groove is provided on the other of the inner sidewall of the housing and the sidewall of the circuit board, with the limiting groove and the limiting protrusion engaging in a concave-convex fit.

[0018] This solution introduces a convex-concave fit between a limiting protrusion and a limiting groove between the circuit board and the housing. This not only achieves relative positioning between the circuit board and the housing, thus preventing the circuit board from moving freely within the housing and causing damage to the first and second conductors, but also indicates the correct installation posture of the circuit board relative to the housing, thereby improving the assembly efficiency of this solution.

[0019] Preferably, a first stop is provided on the inner sidewall of the housing, and the first stop abuts against the side of the circuit board facing the piezoelectric ceramic sheet.

[0020] This solution can limit the degree of freedom of movement of the circuit board relative to the housing along the housing axis, thereby preventing the circuit board from moving freely within the housing and causing damage to the first and second conductors.

[0021] Preferably, a second stop is provided on the housing near the opening of the piezoelectric ceramic sheet, and the second stop abuts against the side of the piezoelectric ceramic sheet away from the circuit board.

[0022] This solution prevents the piezoelectric ceramic sheet from detaching and falling out of the opening in the housing.

[0023] Preferably, the gap between the piezoelectric ceramic sheet and the housing is filled with sealant, and / or the gap between the circuit board and the housing is filled with sealant.

[0024] This solution can improve the sealing between the piezoelectric ceramic sheet and the housing, and / or between the circuit board and the housing, and is suitable for working applications with high sealing requirements.

[0025] In a second aspect, the present invention provides an ultrasonic beauty device, including a main unit and an ultrasonic unit of the present invention, wherein the main unit is electrically connected to a circuit board via terminal wires.

[0026] The ultrasonic beauty device of this solution can input electrical signals to the ultrasonic unit through the main unit, and the ultrasonic unit generates corresponding ultrasonic signals for treating the affected area; and because it uses an ultrasonic unit of this utility model, this solution also has the advantages of long service life, compact appearance and size, and good shell sealing.

[0027] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0028] 1. This utility model provides an ultrasonic unit. By opening a lead wire groove on the inner side wall of the housing, and having both ends of the lead wire groove leading to the side of the piezoelectric ceramic sheet away from the circuit board and the inner side of the housing respectively; by inserting the first wire of the piezoelectric ceramic sheet into the lead wire groove, the first wire can be turned from the outside of the housing to the inside of the housing, and thus smoothly connected to the circuit board; and this solution does not affect the fit between the piezoelectric ceramic sheet and the housing, and can ensure a good sealing effect between the piezoelectric ceramic sheet and the housing.

[0029] 2. This utility model provides an ultrasonic beauty device, in which an electrical signal is input to an ultrasonic unit through a main unit, and the ultrasonic unit generates a corresponding ultrasonic signal for treating the affected area; and because it uses an ultrasonic unit of this utility model, this solution also has the advantages of long service life, compact appearance and size, and good shell sealing. Attached Figure Description

[0030] Figure 1 This is a three-dimensional structural diagram of an ultrasonic unit according to the present invention;

[0031] Figure 2 This is a three-dimensional structural diagram of the housing of an ultrasonic unit according to this utility model;

[0032] Figure 3 This is a top view schematic diagram of the circuit board structure of an ultrasonic unit according to this utility model;

[0033] Figure 4 This is a side cross-sectional view of the piezoelectric ceramic sheet of an ultrasonic unit according to this utility model.

[0034] Figure 5 This is a first top view structural diagram of an ultrasonic unit according to the present invention;

[0035] Figure 6 This is a second top view structural diagram of an ultrasonic unit according to the present invention;

[0036] Figure 7 yes Figure 5 Schematic diagram of the first sectional view of section AA in the middle section;

[0037] Figure 8 yes Figure 5 Schematic diagram of the second sectional view of section AA;

[0038] Figure 9 yes Figure 5 Schematic diagram of the cross-sectional structure of section BB;

[0039] Figure 10 yes Figure 8 A magnified schematic diagram of the structure at point C in the middle;

[0040] Figure 11 This is a schematic diagram of the wiring of the first conductor of an ultrasonic unit according to this utility model;

[0041] Figure 12 This is a schematic diagram of the connection of the second conductor of an ultrasonic unit according to this utility model;

[0042] icon:

[0043] 1-Housing; 11-Lead groove; 12-Limiting protrusion; 13-First stop; 14-Second stop;

[0044] 2-Piezoelectric ceramic sheet; 21-First wire; 22-Second wire;

[0045] 3-Circuit board; 31-Limiting groove; 32-Wire guide hole;

[0046] 4-Terminal wire. Detailed Implementation

[0047] The present invention will be further described in detail below with reference to experimental examples and specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0048] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of the present invention is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a particular device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on the present invention.

[0049] Furthermore, the use of terms such as "horizontal," "vertical," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0050] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0051] Furthermore, in the description of the embodiments of the present invention, "several", "more than", and "a number of" represent at least two. The number can be any number, such as 2, 3, 4, 5, 6, 7, 8, or 9, and can even exceed nine.

[0052] Furthermore, in the description of the technical solution of this invention, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0053] Example 1

[0054] like Figures 1 to 12 As shown, an ultrasonic unit includes a housing 1, a piezoelectric ceramic sheet 2, a circuit board 3, and terminal wires 4; the housing 1 has openings at both ends, the piezoelectric ceramic sheet 2 and the circuit board 3 are spaced apart inside the housing 1 along the axial direction of the housing 1, and the piezoelectric ceramic sheet 2 is positioned close to one of the openings of the housing 1.

[0055] It should be noted that in 7 to Figure 8 middle, Figure 7The diagram shown is a simplified cross-sectional view of the housing 1 without the piezoelectric ceramic sheet 2 and circuit board 3 installed. Figure 8 The diagram shown is a cross-sectional view of the structure with the piezoelectric ceramic sheet 2 and circuit board 3 installed inside the housing 1; Figure 10 In this process, the first wire 21 is bent and separated from the lead groove 11 in order to better identify the lead groove 11 blocked by the first wire 21, and does not mean that the first wire 21 must be bent in actual operation. Figure 11 and Figure 12 To more clearly show the connection between the first conductor 21 and the second conductor 22, the housing 1 was hidden, and the distance between the piezoelectric ceramic sheet 2 and the circuit board 3 was increased.

[0056] The inner wall of the housing 1 is provided with a lead wire groove 11. The length of the lead wire groove 11 is set along the axial direction of the housing 1. One end of the lead wire groove 11 extends to the side of the piezoelectric ceramic sheet 2 facing away from the circuit board 3, for example... Figure 8 and Figure 10 As shown, the lead groove 11 extends away from the circuit board 3 until its end away from the circuit board 3 exceeds the lower surface of the piezoelectric ceramic sheet 2 (the piezoelectric ceramic sheet 2 is located in...). Figure 10 The lower surface of the piezoelectric ceramic sheet 2 is such that the first wire 21 connected to the lower surface of the piezoelectric ceramic sheet 2 can pass through the lead groove 11; the other end of the lead groove 11 extends toward the circuit board 3, and the specific length of the extension is determined according to the specific connection requirements between the circuit board 3 and the first wire 21, which can be as follows: Figure 8 The circuit can extend in a direction away from the piezoelectric ceramic sheet 2 to the lower surface of the circuit board 3, or it can extend in a direction away from the piezoelectric ceramic sheet 2 beyond the lower surface of the circuit board 3, or the extension can end before reaching the lower surface of the circuit board 3.

[0057] The side of the piezoelectric ceramic sheet 2 facing away from the circuit board 3 is connected to a first wire 21. The first wire 21 is routed back into the housing 1 through the lead groove 11 and connected to the circuit board 3. For example... Figure 10 As shown; the other side of the piezoelectric ceramic sheet 2 is connected to a second wire 22, which is connected to the circuit board 3.

[0058] Terminal wire 4 includes a positive wire and a negative wire; one end of terminal wire 4 is connected to circuit board 3, and its positive wire and negative wire are respectively connected to the first wire 21 and the second wire 22l; the other end of terminal wire 4 is used to connect to the host.

[0059] In an optional embodiment, a wire-through hole 32 is provided between the sidewall of the circuit board 3 and the inner sidewall of the housing 1, such as... Figure 6As shown, both the first wire 21 and the second wire 22 pass through the through hole 32 and are connected to the side of the circuit board 3 facing away from the piezoelectric ceramic sheet 2. The specific formation of the through hole 32 includes, but is not limited to: providing a through groove along the axis of the housing 1 on one of the side wall of the circuit board 3 and the inner wall of the housing 1, then the area enclosed by the other side wall of the circuit board 3 and the through groove can serve as the through hole 32; providing through grooves along the axis of the housing 1 at corresponding positions on both the side wall of the circuit board 3 and the inner wall of the housing 1, then the area enclosed by the two through grooves can serve as the through hole 32; ensuring sufficient clearance for the first wire 21 and the second wire 22 to pass between a portion of the side wall of the circuit board 3 and the inner wall of the housing 1, such as... Figure 6 As shown, for a shell 1 with a circular inner wall cross-section, the circuit board 3, based on a circular plate of corresponding size, also has chamfered edges (or grooves) to form an arc-shaped area with the inner wall of the shell 1. This arc-shaped area can serve as a wire hole 32. The number of chamfered edges (or grooves) depends on the number of first wires 21 and second wires 22. For example, if the piezoelectric ceramic sheet 2 is connected to two first wires 21 and one second wire 22, then it can be as follows: Figure 3 The three corners of circuit board 3 are cut off as shown.

[0060] It is important to note that, compared to Figure 5 , Figure 6 The lines below the wire hole 32 have been omitted to facilitate identification of the arc-shaped wire hole 32 formed by the chamfer (or groove) and the inner wall of the housing 1.

[0061] In an optional embodiment, the piezoelectric ceramic sheet 2 is a curved ceramic sheet, and the focal point of the piezoelectric ceramic sheet 2 is located on the side of the piezoelectric ceramic sheet 2 away from the circuit board 3, for example... Figures 8 to 9 As shown, the center of the piezoelectric ceramic sheet 2 protrudes towards the side closer to the circuit board 3, so that the focal point of the piezoelectric ceramic sheet 2 is located on the side away from the circuit board 3; the curved surface shape of the curved ceramic sheet includes, but is not limited to, a sphere, a parabola or a hyperboloid.

[0062] In the above embodiment, the side of the piezoelectric ceramic sheet 2 closest to the circuit board 3 is spherical A, and the side of the piezoelectric ceramic sheet 2 away from the circuit board 3 is spherical B. The centers of spherical A and spherical B coincide, and the diameter of spherical A is larger than the diameter of spherical B.

[0063] In an optional implementation, the number of first wires 21 is at least two.

[0064] In an optional embodiment, the first wires 21 are spaced apart circumferentially along the piezoelectric ceramic sheet 2, and the number and position of the lead grooves 11 match the number and position of the first wires 21. For example Figure 11As shown, two first wires 21 are connected to the piezoelectric ceramic sheet 2, and the angle between the two first wires 21 along the circumference of the piezoelectric ceramic sheet 2 is 180°.

[0065] In an optional embodiment, a limiting protrusion 12 is provided on one of the inner wall of the housing 1 and the side wall of the circuit board 3, and a limiting groove 31 is provided on the other of the inner wall of the housing 1 and the side wall of the circuit board 3, with the limiting groove 31 and the limiting protrusion 12 engaging in a concave-convex fit. For example Figure 2 As shown, a limiting protrusion 12 is provided on the inner side wall of the housing 1, and a limiting groove 31 is provided at the corresponding position on the side wall of the circuit board 3. When the limiting protrusion 12 and the limiting groove 31 are aligned, it means that the angle of the circuit board 3 relative to the housing 1 is correct, and subsequent installation and connection operations can be carried out.

[0066] It is important to note that, in Figure 2 and Figure 7 In the diagram, the dashed line between the limiting protrusion 12 and the first stop 13 is for easy distinction between the limiting protrusion 12 and the first stop 13. However, the limiting protrusion 12 and the first stop 13 can be two different parts on an integrated component or two independent components connected to each other.

[0067] In an optional embodiment, a first stop 13 is provided on the inner sidewall of the housing 1, and the first stop 13 abuts against the side of the circuit board 3 facing the piezoelectric ceramic sheet 2.

[0068] In an optional embodiment, a second stop 14 is provided on the housing 1 near the opening of the piezoelectric ceramic sheet 2, and the second stop 14 abuts against the side of the piezoelectric ceramic sheet 2 facing away from the circuit board 3.

[0069] In the above embodiments, the specific structural form of the first stop 13 includes, but is not limited to: a protrusion disposed on the side of the circuit board 3 facing the piezoelectric ceramic sheet 2 and extending radially toward the center of the housing 1; and the inner sidewall of the housing 1 being made into a stepped hole, with the stepped surface of the stepped hole serving as the first stop 13. The specific structural form of the second stop 14 is similar, including, but not limited to: a protrusion disposed on the side of the piezoelectric ceramic sheet 2 away from the circuit board 3 and extending radially toward the center of the housing 1; and the inner sidewall of the housing 1 being made into a stepped hole, with the stepped surface of the stepped hole serving as the second stop 14. For example... Figure 7 As shown, the inner wall of the housing 1 can be made into a stepped hole with three different diameters, and the diameter gradually decreases from top to bottom, thereby forming two stepped surfaces from top to bottom, namely the first stepped surface and the second stepped surface. The first stepped surface serves as the first stop 13 to limit the position of the circuit board 3; the second stepped surface serves as the second stop 14 to limit the position of the piezoelectric ceramic sheet 2.

[0070] In an optional embodiment, the gap between the piezoelectric ceramic sheet 2 and the housing 1 is filled with sealant, and / or the gap between the circuit board 3 and the housing 1 is filled with sealant.

[0071] Example 2

[0072] An ultrasonic beauty device includes a main unit and an ultrasonic unit as described in Embodiment 1. The main unit is electrically connected to a circuit board 3 via a terminal wire 4. The main unit transmits electrical signals to the circuit board 3 and then to the piezoelectric ceramic sheet 2, thereby causing the piezoelectric ceramic sheet 2 to generate corresponding ultrasonic signals for treating the affected area.

[0073] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An ultrasonic unit, comprising a housing (1), a piezoelectric ceramic sheet (2), a circuit board (3), and a terminal wire (4); the housing (1) has openings at both ends, the piezoelectric ceramic sheet (2) and the circuit board (3) are spaced apart within the housing (1) along the axial direction of the housing (1), the piezoelectric ceramic sheet (2) is disposed near one of the openings of the housing (1), and one end of the terminal wire (4) is electrically connected to the circuit board (3), characterized in that: The inner wall of the housing (1) is provided with a lead wire groove (11). The length of the lead wire groove (11) is set along the axial direction of the housing (1). One end of the lead wire groove (11) extends to the side of the piezoelectric ceramic sheet (2) away from the circuit board (3), and the other end of the lead wire groove (11) extends toward the circuit board (3). The piezoelectric ceramic sheet (2) has a first wire (21) connected to the side facing away from the circuit board (3). The first wire (21) winds back into the housing (1) through the lead groove (11) and is connected to the circuit board (3). The other side of the piezoelectric ceramic sheet (2) has a second wire (22) connected to the circuit board (3).

2. The ultrasonic unit according to claim 1, characterized in that, A wire hole (32) is provided between the side wall of the circuit board (3) and the inner side wall of the housing (1). The first wire (21) and the second wire (22) pass through the wire hole (32) and are connected to the side of the circuit board (3) away from the piezoelectric ceramic sheet (2).

3. The ultrasonic unit according to claim 1, characterized in that, The piezoelectric ceramic sheet (2) is a curved ceramic sheet, and the focal point of the piezoelectric ceramic sheet (2) is located on the side of the piezoelectric ceramic sheet (2) away from the circuit board (3).

4. An ultrasonic unit according to claim 1, characterized in that, The number of the first conductor (21) is at least two.

5. An ultrasonic unit according to claim 4, characterized in that, The first conductor (21) is distributed at intervals along the circumference of the piezoelectric ceramic sheet (2), and the number and position of the lead grooves (11) match the number and position of the first conductor (21).

6. An ultrasonic unit according to any one of claims 1 to 5, characterized in that, A limiting protrusion (12) is provided on one of the inner sidewall of the housing (1) and the sidewall of the circuit board (3), and a limiting groove (31) is provided on the other of the inner sidewall of the housing (1) and the sidewall of the circuit board (3). The limiting groove (31) and the limiting protrusion (12) are in concave-convex fit.

7. An ultrasonic unit according to any one of claims 1 to 5, characterized in that, The inner wall of the housing (1) is provided with a first stop (13), which abuts against the side of the circuit board (3) facing the piezoelectric ceramic sheet (2).

8. An ultrasonic unit according to any one of claims 1 to 5, characterized in that, A second stop (14) is provided on the housing (1) near the opening of the piezoelectric ceramic sheet (2), and the second stop (14) abuts against the side of the piezoelectric ceramic sheet (2) away from the circuit board (3).

9. An ultrasonic unit according to any one of claims 1 to 5, characterized in that, The gap between the piezoelectric ceramic sheet (2) and the housing (1) is filled with sealant, and / or the gap between the circuit board (3) and the housing (1) is filled with sealant.

10. An ultrasonic beauty device, comprising a main unit, characterized in that, It also includes an ultrasonic unit as described in any one of claims 1 to 9, wherein the host is electrically connected to the circuit board (3) via a terminal wire (4).

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