Focused ultrasonic transducer

Abstract

The application provides a focused ultrasonic transducer, comprising a shell, a piezoelectric ceramic sheet, a first electrode and a second electrode, the shell is provided with a cavity, the piezoelectric ceramic sheet is arranged in the cavity, the piezoelectric ceramic sheet comprises opposite first and second surfaces, the outer contours of the first and second surfaces are circular, the first surface is connected with the second surface through a side surface, and the side surface corresponds to the inner wall of the cavity; the first electrode is circularly arranged on the first surface, the first electrode is concentrically arranged with the first surface, the second electrode comprises a circular shape covering the second surface and extending to at least the side surface, the shapes of the second electrode and the first electrode are symmetrical about the diameter of the first surface, the second electrode is spaced apart from the first electrode, and the first electrode and the second electrode are respectively led out to the outside of the shell through lead wires; the application can realize single-sided lead wires, compared with the traditional single-sided lead wire mode, the two poles of the lead wires of the application are located on one side of the piezoelectric ceramic sheet, which is convenient for packaging, improves the uniformity and symmetry of the emitted sound field, and has good sound field emission effect.

Description

Technical Field

[0001] This invention relates to the field of ultrasonic transducer technology, and more particularly to a focused ultrasonic transducer. Background Technology

[0002] Focused ultrasound (FUS) significantly increases the sound intensity at specific points by focusing a sound field, thereby achieving targeted treatment. In recent years, FUS technology has been widely applied in numerous fields, such as using directional focused ultrasound energy to break down and ablate tumor cells, dissolve thrombi in blood vessels, regulate the nervous system, treat subcutaneous tissue in cosmetic procedures, and lyse samples in molecular diagnostics—all within the biomedical field. FUS technology can also be used in advanced manufacturing fields such as laser processing and semiconductor manufacturing.

[0003] Among them, the uniformity of the sound field emitted by the focused ultrasound transducer plays a crucial role in the morphology of the focusing focal zone and the effect of focused ultrasound.

[0004] In the prior art, the focused ultrasonic transducer, due to the electrode form and packaging method of its built-in piezoelectric ceramic sheet, will cause the emitted sound field to be uneven, which will cause the focal zone shape to be distorted. Summary of the Invention

[0005] This invention provides a focusing ultrasonic transducer to solve the defect of uneven sound field emission in the prior art.

[0006] This invention provides a focused ultrasonic transducer, comprising:

[0007] The shell has a cavity;

[0008] A piezoelectric ceramic sheet is disposed in the cavity. The piezoelectric ceramic sheet includes a first surface and a second surface that are opposite each other. The outer contours of the first surface and the second surface are both circular, and the first surface and the second surface are connected by a side surface, which corresponds to the inner wall of the cavity.

[0009] The first electrode is circularly disposed on the first surface and is concentrically disposed with the first surface.

[0010] The second electrode includes a circular electrode that covers the second surface and extends at least to the side surface. The shapes of the second electrode and the first electrode are symmetrical about the diameter of the first surface. The second electrode and the first electrode are spaced apart. The first electrode and the second electrode are respectively led out to the outside of the housing by leads.

[0011] According to the focused ultrasonic transducer provided by the present invention, the second electrode is annularly covering the side surface.

[0012] According to the focused ultrasonic transducer provided by the present invention, the second electrode extends to the first surface and the second electrode covers the periphery of the first surface in a ring shape.

[0013] According to the focused ultrasonic transducer provided by the present invention, a groove is formed between the side surface and the first surface, and the second electrode is disposed between the bottom of the groove and the second surface.

[0014] According to the focused ultrasonic transducer provided by the present invention, the side is arranged in a stepped manner between the first surface and the second surface, including a first vertical surface, a horizontal connecting surface and a second vertical surface, and the second electrode is annularly covered on the first vertical surface and the connecting surface; the first vertical surface is in contact with the inner wall of the cavity, the connecting surface is horizontally arranged, the second vertical surface is connected between the connecting surface and the first surface, and the diameter of the second vertical surface is smaller than the diameter of the first vertical surface.

[0015] The focused ultrasonic transducer provided by the present invention further includes an electrical adapter plate, a first elastic connector, and a second elastic connector. The electrical adapter plate is horizontally disposed in the cavity and corresponds to the first surface. A first end of the first elastic connector contacts the second electrode, and a second end of the first elastic connector is connected to the electrical adapter plate. A first end of the second elastic connector contacts the first electrode, and a second end of the second elastic connector is connected to the electrical adapter plate. Both leads are connected to the electrical adapter plate.

[0016] According to the focused ultrasonic transducer provided by the present invention, the inner wall of the cavity is provided with a limiting structure, and the side of the electrical adapter plate facing away from the piezoelectric ceramic sheet abuts against the limiting structure.

[0017] According to the focused ultrasonic transducer provided by the present invention, the limiting structure includes a slot and a retaining spring. The slot is disposed on the inner wall of the cavity, and the retaining spring is inserted into the slot and abuts against the electrical adapter plate.

[0018] According to the focusing ultrasonic transducer provided by the present invention, the piezoelectric ceramic sheet is configured as a spherical crown, the first surface is an outwardly convex surface, and the second surface is configured as an inwardly concave surface.

[0019] The focusing ultrasonic transducer provided by the present invention further includes a cover plate, which is connected to the open end of the housing.

[0020] This invention provides a focusing ultrasonic transducer, comprising a housing, a piezoelectric ceramic sheet, a first electrode, and a second electrode. The ultrasonic transducer provided by this invention, through the design of the position and shape of the first and second electrodes of the piezoelectric ceramic sheet, enables single-sided wiring after being installed in the housing. Compared to the traditional single-sided wiring method, the leads of this invention are both located on one side of the piezoelectric ceramic sheet, facilitating encapsulation and improving the uniformity and symmetry of the emitted sound field, preventing focal "distortion" and resulting in excellent sound field emission performance.

[0021] Furthermore, by using electrode leads to make contact connections with the electrodes of the piezoelectric ceramic sheet, the stability of the internal electrical connections of the focusing transducer can be improved. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the piezoelectric ceramic sheet provided in an embodiment of the present invention;

[0024] Figure 2 for Figure 1 Schematic diagram of the mounting structure in the housing;

[0025] Figure 3 In another embodiment Figure 1 Schematic diagram of the mounting structure in the housing;

[0026] Figure 4 This is a schematic diagram of the structure of a piezoelectric ceramic sheet provided in another embodiment of the present invention;

[0027] Figure 5 for Figure 4 Schematic diagram of the mounting structure in the housing;

[0028] Figure 6 This is a schematic diagram of the structure of a piezoelectric ceramic sheet provided in another embodiment of the present invention;

[0029] Figure 7 for Figure 6 A schematic diagram of the side structure of a medium-voltage ceramic plate;

[0030] Figure 8 for Figure 6 Schematic diagram of the mounting structure in the housing;

[0031] Figure 9 In another embodiment Figure 6Schematic diagram of the mounting structure in the housing;

[0032] Figure 10 This is a schematic diagram of the structure of a piezoelectric ceramic sheet provided in another embodiment of the present invention;

[0033] Figure 11 for Figure 10 Schematic diagram of the mounting structure in the housing;

[0034] Figure 12 This is a schematic diagram of the installation structure of a piezoelectric ceramic sheet with a double-sided electrode in a housing in the prior art;

[0035] Figure 13 This is a schematic diagram of the structure of a piezoelectric ceramic sheet with a flanged electrode in the prior art;

[0036] Figure 14 for Figure 13 A schematic diagram of the installation structure within the housing.

[0037] Figure label:

[0038] 1. Housing; 2. Piezoelectric ceramic sheet; 21. First electrode; 22. Second electrode; 3. Side; 31. First elevation; 32. Horizontal connecting surface; 33. Second elevation; 4. Electrical adapter plate; 5. First elastic element; 6. Second elastic element; 7. Recessed groove; 8. Snap ring; 9. Cover plate. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0040] In existing technologies, ultrasonic transducers typically consist of a spherical piezoelectric ceramic sheet 2, on which two electrodes are mounted. The piezoelectric ceramic sheet 2 is sealed to the housing 1, and the two electrodes on the piezoelectric ceramic sheet 2 are led to the outside of the transducer via lead wires. Common electrode configurations include double-sided electrodes and flanged electrodes, such as... Figure 12 As shown, the piezoelectric ceramic sheet 2 uses double-sided electrodes. During assembly, the electrode leads of one side need to be wound to the back. This affects the sound field emission and makes encapsulation difficult. Since waterproofing is required, it can only be filled with potting compound, which also affects the aesthetics.

[0041] like Figures 13-14As shown, flanged electrodes are typically flanged into one or a pair of "C" shapes on one side or opposite sides. While this solves the problem of double-sided electrodes, the "C" shape of the flanged edges affects the symmetry of the sound field distribution, causing focal distortion.

[0042] The following is combined with Figures 1 to 11 This invention describes a focused ultrasonic transducer provided in an embodiment of the invention.

[0043] This embodiment provides a focused ultrasonic transducer, comprising: a housing 1, a piezoelectric ceramic sheet 2, a first electrode 21, and a second electrode 22.

[0044] The housing 1 has a cavity, and the piezoelectric ceramic sheet 2 is disposed in the cavity. The piezoelectric ceramic sheet 2 includes a first surface and a second surface that are opposite each other. The outer contours of the first surface and the second surface are both circular, and the first surface and the second surface are connected by a side surface 3, which corresponds to the inner wall of the cavity. The first electrode 21 is circularly disposed on the first surface and is concentrically disposed with the first surface. The second electrode 22 is circularly disposed on the second surface and extends at least to the side surface 3. That is, the second electrode 22 is at least turned onto the side surface 3, and can be partially or completely turned onto the side surface 3 or the first surface. The second electrode 22 and the first electrode 21 are symmetrical about the diameter of the first surface. The second electrode 22 and the first electrode 21 are spaced apart, and the first electrode 21 and the second electrode 22 are respectively led out to the outside of the housing 1 by leads.

[0045] As can be seen from the above scheme, the ultrasonic transducer provided by the present invention, through the design of the position and shape of the first electrode 21 and the second electrode 22 of the piezoelectric ceramic sheet 2, can achieve single-sided lead wire after it is installed in the housing 1. Compared with the traditional single-sided lead wire method, the two electrode leads of the present invention are located on one side of the piezoelectric ceramic sheet 2, which is convenient for packaging and improves the uniformity and symmetry of the emitted sound field, does not cause focal "distortion", and has a good sound field emission effect.

[0046] The piezoelectric ceramic sheet 2 is located inside the cavity, with its side surface 3 corresponding to the inner wall of the cavity. The side surface 3 can be in contact with the inner wall of the cavity, or there can be a certain gap between them. The piezoelectric ceramic sheet 2 is fixed by applying insulating glue at the gap.

[0047] Optionally, the second electrode 22 extends to the first surface, and the second electrode 22 is arranged in a ring covering the periphery of the first surface; as shown Figure 1 and Figure 2 As shown, the piezoelectric ceramic sheet 2 has its first surface facing down in the cavity, and both electrode leads are connected to the first surface, achieving the above-mentioned effects while also being aesthetically pleasing.

[0048] Optionally, the second electrode 22 is arranged in a ring shape covering the side 3, for example, as shown in the figure. Figure 4 and Figure 5 As shown, the piezoelectric ceramic sheet 2 has its first surface facing down in the cavity, and the two electrode leads are respectively connected to the side 3 and the first surface. Compared with the above-mentioned form where the second electrode 22 extends to the first surface, this method can increase the effective area of ​​sound radiation (increase the area of ​​the first electrode 21 on the first surface). The second electrode 22 is completely or partially turned off to the side 3, which can also achieve the goal of not having to wrap the leads to the upper second surface, without affecting the sound field emission and packaging.

[0049] In some embodiments, the piezoelectric ceramic sheet 2 is configured as a spherical crown shape to form a focused ultrasonic transducer, wherein the first surface is an outwardly convex surface and the second surface is configured as an inwardly concave surface.

[0050] Furthermore, it also includes an electrical adapter plate 4, a first elastic connector 5, and a second elastic connector 6. The electrical adapter plate 4 is horizontally disposed in the cavity and corresponds to the first surface. The first end of the first elastic connector 5 is in contact with the second electrode 22, and the second end of the first elastic connector 5 is connected to the electrical adapter plate 4. The first end of the second elastic connector 6 is in contact with the first electrode 21, and the first end of the second elastic connector 6 is connected to the electrical adapter plate 4. Both leads are connected to the electrical adapter plate 4.

[0051] This configuration allows the electrode leads to be connected in contact with the electrodes, reducing the impact of welding joints on the transducer's vibration effect and minimizing the damage to the performance of the piezoelectric ceramic element caused by the welding process temperature. Furthermore, by using an adapter plate to connect the leads and extend them outside the transducer housing 1, it is possible to prevent the internal leads from breaking due to external pulling on the transducer.

[0052] Reference Figure 3 In this embodiment, the piezoelectric ceramic sheet 2 is shaped like a spherical crown, the second electrode 22 extends to the first surface, and the second electrode 22 covers the periphery of the first surface in a ring. The first elastic connector 5 and the second elastic connector 6 are both springs, and the diameter of the first elastic connector 5 is larger than the diameter of the second elastic connector 6. During installation, the first end of the first elastic connector 5 contacts the second electrode 22, and the second end of the first elastic connector 5 is connected to the electrical adapter plate 4. The second elastic connector 6 is located inside the first elastic connector 5, and its first end contacts the first electrode 21. The second end of the second elastic connector 6 is connected to the electrical adapter plate 4. Both leads are connected to the electrical adapter plate 4 and led out of the housing 1. In this way, the piezoelectric ceramic sheet 2 and the leads can be connected in contact.

[0053] Reference Figure 6 , Figure 7 and Figure 9In some embodiments, the piezoelectric ceramic sheet 2 is shaped like a spherical crown, with the first electrode 21 covering the first surface. The side surface 3 is stepped and positioned between the first and second surfaces, including a first vertical surface 31, a horizontal connecting surface 32, and a second vertical surface 33. The second electrode 22 is annularly covering the first vertical surface 31 and the connecting surface. The first vertical surface 31 contacts the inner wall of the cavity, the connecting surface is horizontal, and the second vertical surface 33 connects the connecting surface and the first surface. The diameter of the second vertical surface 33 is smaller than the diameter of the first vertical surface 31. Both the first elastic connector 5 and the second elastic connector 6 are elastic. The spring has a diameter greater than that of the second elastic connector 6. During installation, the first elastic connector 5 is sleeved around the second vertical surface 33, with its first end in contact with the second electrode 22 of the horizontal connecting surface 32, and its second end connected to the electrical adapter plate 4. The second elastic connector 6 is located inside the first elastic connector 5, with its first end in contact with the first electrode 21, and its second end connected to the electrical adapter plate 4. Both leads are connected to the electrical adapter plate 4 and led out of the housing 1, thus achieving a contact connection between the piezoelectric ceramic sheet 2 and the leads.

[0054] Optionally, such as Figure 8 As shown, the two leads can be directly connected to the first vertical surface 31 and the first surface, or they can be connected to the horizontal connecting surface 32 and the first surface, respectively, thus eliminating the need to wind the leads to the upper second surface.

[0055] Reference Figure 10 and Figure 11 In other embodiments, the piezoelectric ceramic sheet 2 is shaped like a spherical crown, with the first electrode 21 covering the first surface. A groove 7 is formed between the side 3 and the first surface. The groove 7 can be one or two symmetrically arranged. A second electrode 22 is provided between the bottom of the groove 7 and the second surface. The first elastic connector 5 is an elastic pin, and the second elastic connector 6 is a spring. During installation, the first end of the first elastic connector 5 is embedded in the groove 7 and contacts the second electrode 22 at the bottom of the groove 7, and its second end is connected to the electrical adapter plate 4. The second elastic connector 6 is located at the center of the cavity, with its first end contacting the first electrode 21 and its second end connected to the electrical adapter plate 4. Both leads are connected to the electrical adapter plate 4 and led out of the housing 1. This also achieves a contact connection between the piezoelectric ceramic sheet 2 and the leads. Compared with other methods, this method can obtain the largest effective area for sound radiation, but the uniformity of the sound field distribution is not as good as other methods.

[0056] Furthermore, a limiting structure is provided on the inner wall of the cavity, and the side of the electrical adapter plate 4 facing away from the piezoelectric ceramic sheet 2 abuts against the limiting structure.

[0057] like Figure 3 , Figure 9 and Figure 11 As shown, the limiting structure includes a slot and a retaining spring 8. The slot is set on the inner wall of the cavity, and the retaining spring 8 is inserted into the slot and abuts against the electrical adapter plate 4. Since one side of the electrical adapter plate 4 is subjected to the elastic force of the first elastic connector 5 and the second elastic connector 6, the electrical adapter plate 4 is positioned by setting a limiting structure on the other side, and can be easily disassembled and assembled by removing the retaining spring 8.

[0058] In this embodiment, a cover plate 9 is also included, which is connected to the open end of the housing 1, such as... Figure 3 , Figure 9 and Figure 11 As shown, the cover plate 9 corresponds to the side of the electrical adapter plate 4 that faces away from the piezoelectric ceramic sheet 2, and the components inside the housing 1 are encapsulated by the cover plate 9.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A focusing ultrasonic transducer, characterized in that, include: The housing (1) has a cavity; A piezoelectric ceramic sheet (2) is disposed in the cavity. The piezoelectric ceramic sheet (2) includes a first surface and a second surface opposite to each other. The outer contours of the first surface and the second surface are both circular, and the first surface and the second surface are connected by a side surface (3). The side surface (3) corresponds to the inner wall of the cavity. The first electrode (21) is circularly disposed on the first surface and is concentrically disposed with the first surface; The second electrode (22) is circular and covers the second surface and extends at least to the side (3). The shape of the second electrode (22) and the first electrode (21) are symmetrical about the diameter of the first surface. The second electrode (22) and the first electrode (21) are spaced apart, and the first electrode (21) and the second electrode (22) are respectively led out to the outside of the housing (1) by leads.

2. The focusing ultrasonic transducer according to claim 1, characterized in that, The second electrode (22) is circumferentially covered on the side (3).

3. The focusing ultrasonic transducer according to claim 1, characterized in that, The second electrode (22) extends to the first surface and is circumferentially covered around the first surface.

4. The focusing ultrasonic transducer according to claim 1, characterized in that, A groove (7) is provided between the side surface (3) and the first surface, and the second electrode (22) is provided between the bottom of the groove (7) and the second surface.

5. The focusing ultrasonic transducer according to claim 1, characterized in that, The side surface (3) is arranged in a stepped manner between the first surface and the second surface, including a first vertical surface (31), a horizontal connecting surface (32), and a second vertical surface (33). The second electrode (22) is annularly covered on the first vertical surface (31) and the connecting surface. The first vertical surface (31) is in contact with the inner wall of the cavity. The connecting surface is horizontally arranged. The second vertical surface (33) is connected between the connecting surface and the first surface, and the diameter of the second vertical surface (33) is smaller than the diameter of the first vertical surface (31).

6. The focusing ultrasonic transducer according to any one of claims 3-5, characterized in that, It also includes an electrical adapter plate (4), a first elastic connector (5), and a second elastic connector (6). The electrical adapter plate (4) is horizontally disposed in the cavity and corresponds to the first surface. The first end of the first elastic connector (5) is in contact with the second electrode (22), and the second end of the first elastic connector (5) is connected to the electrical adapter plate (4). The first end of the second elastic connector (6) is in contact with the first electrode (21), and the second end of the second elastic connector (6) is connected to the electrical adapter plate (4). Both leads are connected to the electrical adapter plate (4).

7. The focusing ultrasonic transducer according to claim 6, characterized in that, The inner wall of the cavity is provided with a limiting structure, and the side of the electrical adapter plate (4) facing away from the piezoelectric ceramic sheet (2) abuts against the limiting structure.

8. The focusing ultrasonic transducer according to claim 7, characterized in that, The limiting structure includes a slot and a retaining spring (8). The slot is disposed on the inner wall of the cavity, and the retaining spring (8) is inserted into the slot and abuts against the electrical adapter plate (4).

9. The focusing ultrasonic transducer according to claim 1, characterized in that, The piezoelectric ceramic sheet (2) is configured as a spherical crown, with the first surface being an outwardly convex surface and the second surface being an inwardly concave surface.

10. The focusing ultrasonic transducer according to claim 1, characterized in that, It also includes a cover plate (9) which is connected to the open end of the housing (1).

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