An ultrasonic focusing transducer

Abstract

This utility model discloses an ultrasonic focusing transducer, including a housing, a piezoelectric ceramic, and a circuit board. The four sides of the piezoelectric ceramic and the four sides of the circuit board abut against the inner wall of the housing. The piezoelectric ceramic includes a first electrode surface and a second electrode surface, with the first electrode surface facing the circuit board. It also includes a first conductive structure and a second conductive structure. The two ends of the first conductive structure are connected to the circuit board and the first electrode surface, respectively. One end of the second conductive structure is connected to the circuit board, and the other end passes through a clearance space in the inner wall of the housing and connects to the second electrode surface. This design prevents the wires from being squeezed and damaged by the edges of the piezoelectric ceramic. Furthermore, the electric field lines are perpendicular to the surface of the piezoelectric ceramic, and the electric field intensity is uniformly distributed along the thickness direction of the piezoelectric ceramic, effectively exciting the interior of the piezoelectric ceramic. Compared to setting two electrode regions on one surface, this design improves piezoelectric efficiency.

Description

Technical Field

[0001] This utility model relates to the field of transducer technology, specifically to an ultrasonic focusing transducer. Background Technology

[0002] An ultrasonic transducer is a device that converts electrical energy into ultrasonic energy, or vice versa. When an electrical signal (usually high-frequency alternating current) is input, the piezoelectric material inside the transducer undergoes the inverse piezoelectric effect, causing it to vibrate mechanically and radiate ultrasonic waves into the surrounding medium (such as air, water, solids, or human tissue).

[0003] Patent document CN222445203U discloses an ultrasonic ceramic sheet, which has a first surface and a second surface disposed opposite to each other, and a peripheral surface connecting the first surface and the second surface; the first surface is provided with a positive electrode region, a negative electrode region, and a first insulating region that isolates the positive electrode region and the negative electrode region, the positive electrode region being used for connection to the positive terminal of a power supply, and the negative electrode region being used for connection to the negative terminal of a power supply.

[0004] The aforementioned patent allows for convenient connection of the positive and negative electrode wires to the positive and negative electrode regions respectively, eliminating the need for the wires to bypass the peripheral wall of the ultrasonic ceramic sheet and preventing them from being squeezed out or damaged by the edges of the sheet. However, this design, which places both the positive and negative electrodes of the ultrasonic ceramic sheet on the same surface, has the following drawbacks: the electric field lines are mostly parallel to the surface of the ultrasonic ceramic sheet or decrease sharply along its thickness direction; the electric field strength is uneven along the thickness direction of the sheet, with the strongest electric field near the surface of the electrode and decreasing further inside. This means that only a thin layer near the electrode surface is driven by a strong electric field, while most of the volume inside the ultrasonic ceramic sheet cannot be effectively excited. This design reduces the utilization rate of the piezoelectric material and the overall driving efficiency, thus requiring improvement. Utility Model Content

[0005] To address the problems existing in the prior art, the purpose of this utility model is to provide an ultrasonic focusing transducer that can prevent the wire from being squeezed off or damaged by the edge of the piezoelectric ceramic, provided that the piezoelectric ceramic is set with one side as positive and the other side as negative.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] An ultrasonic focusing transducer includes a housing, a piezoelectric ceramic, and a circuit board. The four sides of the piezoelectric ceramic and the four sides of the circuit board abut against the inner wall of the housing. The piezoelectric ceramic includes a first electrode surface and a second electrode surface, with the first electrode surface disposed opposite to the circuit board. The transducer also includes a first conductive structure and a second conductive structure. The two ends of the first conductive structure are connected to the circuit board and the first electrode surface, respectively. One end of the second conductive structure is connected to the circuit board, and the other end of the second conductive structure passes through a clearance space disposed on the inner wall of the housing and is connected to the second electrode surface.

[0008] Furthermore, the bottom surface of the circuit board, the inner wall of the housing, and the first electrode surface together form a first wiring space, and the second electrode surface and the inner wall of the housing together form a second wiring space. The first wiring space is connected to the second wiring space through the clearance space. The first conductive structure is located in the first wiring space, one end of the second conductive structure is located in the first wiring space, and the other end of the second conductive structure is located in the second wiring space.

[0009] Furthermore, the first conductive structure includes a first conductive line, with both ends of the first conductive line connected to the circuit board and the first electrode surface, respectively. The second conductive structure includes a second conductive line, with one end of the second conductive line connected to the circuit board and the other end of the second conductive line passing through the clearance space and connected to the second electrode surface.

[0010] Furthermore, the first conductive structure includes a first elastic contact pin, and the second conductive structure includes a second elastic contact pin and a third conductive wire. The first elastic contact pin and the second elastic contact pin are respectively disposed on the circuit board. The end of the first elastic contact pin abuts against the first electrode surface, the end of the second elastic contact pin abuts against an insulating area disposed on the first electrode surface, and one end of the third conductive wire is connected to the second elastic contact pin, and the other end of the third conductive wire passes through the clearance space and is connected to the second electrode surface.

[0011] Furthermore, the inner wall of the housing is formed with a first step portion and a second step portion protruding radially, the first step portion being located above the second step portion, the circuit board being disposed on the first step portion, and the piezoelectric ceramic being disposed on the second step portion.

[0012] Furthermore, the inner wall of the shell is recessed with a recessed structure, and the area enclosed by the inner wall of the recessed structure is the clearance space.

[0013] Furthermore, the recessed structure includes a first recessed substructure and a second recessed substructure that are interconnected. The first recessed substructure is recessed into the inner wall of the shell, and the second recessed substructure is recessed into the top surface of the second step.

[0014] Furthermore, the projection of the first recessed substructure onto a cross section passing through the central axis of the housing has a first angle with the projection of the second recessed substructure onto a cross section passing through the central axis of the housing.

[0015] Furthermore, the inner wall of the housing is provided with a channel, and the area enclosed by the inner wall of the channel is the clearance space.

[0016] Furthermore, the channel includes an inlet and an outlet, the projection of the inlet on the cross section being located between the projection of the piezoelectric ceramic on the cross section and the projection of the circuit board on the cross section, and the projection of the outlet on the cross section being located below the projection of the piezoelectric ceramic on the cross section.

[0017] Furthermore, the top surface of the second step is provided with a protruding structure, and the inner wall of the protruding structure, the top surface of the second step, and the inner wall of the shell together form a placement space, in which the piezoelectric ceramic is disposed.

[0018] Furthermore, the protruding structure has a second angle relative to the top surface of the second step portion, the second angle being greater than or equal to 90°.

[0019] Furthermore, the protruding structure is arc-shaped.

[0020] Furthermore, the first stepped portion has a first distance from the central axis of the housing, and the second stepped portion has a second distance from the central axis of the housing, wherein the first distance is greater than the second distance.

[0021] Furthermore, the second electrode surface is concave.

[0022] The beneficial effects of this utility model are as follows:

[0023] This invention utilizes a clearance space within the inner wall of the housing to allow the first conductive structure to directly connect the circuit board and the first electrode surface. The second conductive structure, aided by this clearance space, bypasses the piezoelectric ceramic sheet and connects to the second electrode surface. This design prevents the wires from being squeezed and damaged by the edges of the piezoelectric ceramic. Furthermore, since the first and second electrode surfaces are located on the same vertical plane, the electric field lines are perpendicular to the surface of the piezoelectric ceramic, ensuring a uniform distribution of the electric field intensity along the thickness of the ceramic. This effectively excites the interior of the piezoelectric ceramic. Compared to placing two electrode regions on a single surface, this design improves piezoelectric efficiency. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the present invention;

[0025] Figure 2 yes Figure 1 A schematic diagram of the decomposed structure;

[0026] Figure 3 yes Figure 1 A cross-sectional view;

[0027] Figure 4 yes Figure 3 Enlarged structural diagram of point A in the middle;

[0028] Figure 5 This is a cross-sectional schematic diagram of the second embodiment of the present invention;

[0029] Figure 6 This is a cross-sectional schematic diagram of the third embodiment of the present invention;

[0030] Figure 7 yes Figure 6 A three-dimensional structural diagram of the middle shell.

[0031] Figure Labels

[0032] 100. Ultrasonic focusing transducer; 1. Housing; 11. First step; 12. Second step; 121. Protruding structure; 122. Placement space; 2. Piezoelectric ceramic; 21. First electrode surface; 22. Second electrode surface; 3. Circuit board; 4. First conductive structure; 41. First conductive wire; 42. First elastic contact pin; 5. Second conductive structure; 51. Second conductive wire; 52. Second elastic contact pin; 53. Third conductive wire; 6. Clearance space; 61. Recessed structure; 611. First recessed substructure; 612. Second recessed substructure; 62. Channel; 621. Inlet; 622. Outlet; 7. First wiring space; 8. Second wiring space; 9. Power supply component; 91. Power supply wire; 92. Protective shell. Detailed Implementation

[0033] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "top surface", "bottom surface", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In this description of the utility model, "a number" means two or more, unless otherwise explicitly specified.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection; they can refer to a direct connection or a connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] In this invention, "central axis" refers to a straight line that runs through the geometric center of an object and embodies its symmetry or main direction. "Radial" refers to the direction in which the object radiates horizontally outward from a point on the central axis or points horizontally outward towards a point on the central axis, i.e., the direction perpendicular to the central axis. "Axial" refers to the direction along the central axis.

[0037] The utility model will be further described below with reference to the accompanying drawings and specific embodiments. The following description is merely exemplary and does not limit the scope of protection of the utility model.

[0038] Please refer to the details. Figures 1-4This utility model discloses an ultrasonic focusing transducer 100, including a housing 1, a piezoelectric ceramic 2, and a circuit board 3. The four sides of the piezoelectric ceramic 2 and the four sides of the circuit board 3 abut against the inner wall of the housing 1. The piezoelectric ceramic 2 includes a first electrode surface 21 and a second electrode surface 22, with the first electrode surface 21 positioned opposite to the circuit board 3. It also includes a first conductive structure 4 and a second conductive structure 5. The two ends of the first conductive structure 4 are connected to the circuit board 3 and the first electrode surface 21, respectively. One end of the second conductive structure 5 is connected to the circuit board 3, and the other end of the second conductive structure 5 passes through a clearance space 6 provided in the inner wall of the housing 1 and connects to the second electrode surface 22. This means that even if the four sides of the piezoelectric ceramic 2 and the inner wall of the housing 1 are in close contact, the clearance space 6 provides physical protection for the second conductive structure 5. On the one hand, this allows the second conductive structure 5 to connect the circuit board 3 and the second electrode surface 22; on the other hand, it prevents the four sides of the piezoelectric ceramic 2 and the inner wall of the housing 1 from compressing the second conductive structure 5. Specifically, the first electrode surface 21 and the second electrode surface 22 are located on the same vertical plane to ensure that the electric field lines are perpendicular to the surface of the piezoelectric ceramic 2, and the electric field intensity is uniformly distributed in the thickness direction of the piezoelectric ceramic 2. The electric field can effectively excite the interior of the piezoelectric ceramic 2. Compared with setting two electrode regions on one surface, this design can improve the piezoelectric efficiency.

[0039] Please refer to the details. Figure 3 In this embodiment, the bottom surface of the circuit board 3, the inner wall of the housing 1, and the first electrode surface 21 together form a first wiring space 7, and the second electrode surface 22 and the inner wall of the housing 1 together form a second wiring space 8. The first wiring space 7 is connected to the second wiring space 8 through a clearance space 6. The first conductive structure 4 is entirely located in the first wiring space 7, one end of the second conductive structure 5 is located in the first wiring space 7, and the other end of the second conductive structure 5 is located in the second wiring space 8.

[0040] Specifically, the cross-sectional dimension of the first routing space 7 is larger than the cross-sectional dimension of the second routing space 8. Please refer to [reference needed] for details. Figure 2 and Figure 3 The inner wall of the housing 1 has a first step 11 and a second step 12 that protrude radially, with the first step 11 located above the second step 12. A cross section T passes through the central axis D1 of the housing 1 and is perpendicular to the radial direction of the housing 1. The projection of the first step 11 onto this cross section T has a first distance D2 from the central axis D1 of the housing 1, and the projection of the second step 12 onto this cross section T has a second distance D3 from the central axis D1 of the housing 1. The first distance D2 is greater than the second distance D3, therefore the cross-sectional dimension of the first trace space 7 is greater than the cross-sectional dimension of the second trace space 8. The circuit board 3 is disposed on the first step 11, and the piezoelectric ceramic 2 is disposed on the second step 12, with the first electrode surface 21 of the piezoelectric ceramic 2 facing the circuit board 3.

[0041] Of course, in other implementations, the first distance D2 is less than the second distance D3, so that the cross-sectional size of the first routing space 7 is less than the cross-sectional size of the second routing space 8 (not shown), and this is not limited here.

[0042] Please refer to the details. Figure 3 In this embodiment, the first conductive structure 4 includes a first conductive line 41, and the second conductive structure 5 includes a second conductive line 51. The first conductive line 41 is located in the first wiring space 7, and its two ends are connected to the circuit board 3 and the first electrode surface 21, respectively. The first part of the second conductive line 51 is located in the first wiring space 7, the second part of the second conductive line 51 is located in the clearance space 6, and the third part of the second conductive line 51 is located in the second wiring space 8. One end of the second conductive line 51 is connected to the circuit board 3, and the other end of the second conductive line 51 passes through the clearance space 6 and connects to the second electrode surface 22. The advantage of using this linear structure of the first conductive line 41 and the second conductive line 51 as a connector is that the first conductive line 41 and the second conductive line 51 have bending and stretching capabilities, allowing the first conductive line 41 to adapt to the gap between the circuit board 3 and the piezoelectric ceramic 2, and allowing the second conductive line 51 to adapt to the shape of the clearance space 6, thereby bypassing the clearance space 6 to connect the circuit board 3 and the second electrode surface 22.

[0043] In this embodiment, the second electrode surface 22 is concave. When a voltage is applied to the piezoelectric ceramic 2, the ultrasonic waves emitted from different positions of the second electrode surface 22 will naturally focus towards the center of curvature of the concave surface (i.e., the focal point). Therefore, the energy will naturally be superimposed and enhanced during the propagation process.

[0044] Please refer to the details. Figures 1-4In this embodiment, a recessed structure 61 is provided on the inner wall of the shell 1. The area enclosed by the inner wall of the recessed structure 61 is the aforementioned clearance space 6. The inward distance of the recessed structure 61 is substantially the same as the thickness of the first step portion 11. Specifically, the recessed structure 61 includes a first recessed substructure 611 and a second recessed substructure 612 that are interconnected. The first recessed substructure 611 is recessed into the inner wall of the shell 1, and the second recessed substructure 612 is recessed into the top surface of the second step portion 12. More specifically, the projection of the first recessed substructure 611 onto the cross-section T is linear, and the projections of the first recessed substructure 611 onto the cross-section T and the projections of the second recessed substructure 612 onto the cross-section T have a first angle L1. The magnitude of the first angle L1 can be any value between 60°, 70°, 80°, 90°, 100°, 110°, and 120°. In a preferred embodiment, the first angle L1 is 90°, and the length direction of the first recessed substructure 611 is parallel to the direction of the central axis D1 of the housing 1. Of course, in other embodiments, the projection of the first recessed substructure 611 on the cross-section T may be curved, depending on the actual working conditions, and is not limited here.

[0045] The projection of the first recessed substructure 611 onto section T has a first length (not shown in the figure), and the projection of the first trace space 7 onto section T has a first width (not shown in the figure). The first length is greater than the first width to ensure that the first recessed substructure 611 has sufficient length to extend into the second trace space 8. At this time, the second recessed substructure 612 is located below the piezoelectric ceramic 2 and is connected to the second trace space 8. Therefore, the second conductive wire 51 can enter the second trace space 8 from the first trace space 7 under the action of the first recessed substructure 611 and the second recessed substructure 612.

[0046] Please refer to the details. Figures 2-4In this embodiment, a protruding structure 121 is provided on the top surface of the second step portion 12, specifically located at the edge of the top surface of the second step portion 12. The inner wall of the protruding structure 121, the top surface of the second step portion 12, and the inner wall of the shell 1 together form a placement space 122, in which the piezoelectric ceramic 2 is placed. The purpose of providing the protruding structure 121 is that when supported only by the second step portion 12, the piezoelectric ceramic 2 is fixed in the Z-axis direction (equivalent to the vertical direction), but in the X and Y-axis directions (equivalent to the horizontal direction), it is only fixed by interference fit or adhesive to the inner wall of the shell 1. Under long-term reverse piezoelectric effect, the piezoelectric ceramic 2 is prone to displacement. After providing the protruding structure 121, the inner wall of the protruding structure 121, the top surface of the second step portion 12, and the inner wall of the shell 1 form a U-shaped enclosure structure, which constrains the piezoelectric ceramic 2 in three directions, thereby reducing the displacement of the piezoelectric ceramic 2 caused by long-term reverse piezoelectric effect. Specifically, the protruding structure 121 has a second angle L2 relative to the top surface of the second step portion 12. In one embodiment, the second angle L2 is 90°, and the protruding structure 121 is in point contact with the piezoelectric ceramic 2.

[0047] In some other embodiments, the second angle L2 is greater than 90°, so that the protrusion structure 121 plays a guiding role during installation and automatically corrects the position of the piezoelectric ceramic 2 when assembling the piezoelectric ceramic 2.

[0048] In the third embodiment, the protrusion structure 121 is arc-shaped, and the curvature of the protrusion structure 121 matches the curvature of the second electrode surface 22 of the piezoelectric ceramic 2. Similarly, its function is to change the point contact between the protrusion structure 121 and the piezoelectric ceramic 2 into a surface contact, thereby playing a role in buffering and guiding.

[0049] In this embodiment, the housing 1 is cylindrical. The first step portion 11 can be any of a cube-shaped structure, a cuboid-shaped structure, a spherical structure, or a ring-shaped structure. As a preferred embodiment, the first step portion 11 is a ring-shaped structure in this embodiment. The advantage of setting the first step portion 11 in a ring-shaped structure is that the ring-shaped first step portion 11 provides a larger support surface for the circuit board 3, so that the pressure of the circuit board 3 is evenly distributed across the entire surface of the first step portion 11, which can effectively disperse stress and reduce the risk of breakage of the first step portion 11. Similarly, the second step portion 12 in this embodiment is also a ring-shaped structure.

[0050] Please refer to the details. Figures 1-2In this embodiment, a power supply component 9 is also included. The power supply component 9 includes a power supply line 91, which is connected to the circuit board 3. The power supply component 9 also includes a protective shell 92, which surrounds the power supply line 91 to prevent damage to the power supply line 91 from external environmental factors. The lengths of the power supply line 91 and the protective shell 92 are not limited here and are determined according to the actual working conditions.

[0051] The working principle of this utility model is described below to facilitate a better understanding of it:

[0052] The piezoelectric ceramic 2 is disposed on the second step portion 12. The two ends of the first conductive line 41 are connected to the circuit board 3 and the first electrode surface 21, respectively. One end of the second conductive line 51 is connected to the circuit board 3, and the other two ends of the second conductive line 51 pass sequentially through the first recessed substructure 611 and the second recessed substructure 612 into the second wiring space 8, and are connected to the second electrode surface 22. The circuit board 3 is disposed on the first step portion 11. Power is supplied to the circuit board 3 through the power supply line 91. The circuit board 3 forms a circuit by connecting the first conductive line 41 to the first electrode surface 21 and the second conductive line 51 to the second electrode surface 22, applying voltage to the piezoelectric ceramic 2. The piezoelectric ceramic 2 exhibits the inverse piezoelectric effect, thereby generating high-frequency vibrations. These high-frequency vibrations propagate through the medium in contact with it, forming ultrasonic waves. Since the second electrode surface 22 is concave, ultrasonic waves emitted from different positions on the second electrode surface 22 naturally focus towards the center of curvature of the concave surface (i.e., the focal point), thus the energy is superimposed and amplified during propagation.

[0053] This invention provides a clearance space 6 on the inner wall of the housing 1, allowing the first conductive structure 4 to directly connect the circuit board 3 and the first electrode surface 21. The second conductive structure 5, under the influence of the clearance space 6, bypasses the piezoelectric ceramic 2 and connects to the second electrode surface 22. This design prevents the wires from being squeezed and damaged by the edges of the piezoelectric ceramic 2. Furthermore, since the first electrode surface 21 and the second electrode surface 22 are located on the same vertical plane, the electric field lines are perpendicular to the surface of the piezoelectric ceramic 2, and the electric field intensity is uniformly distributed along the thickness direction of the piezoelectric ceramic 2, effectively exciting the interior of the piezoelectric ceramic 2. Compared to setting two electrode areas on a single surface, this design improves piezoelectric efficiency.

[0054] Please refer to the details. Figure 5 , Figure 5 This is a cross-sectional schematic diagram of the second embodiment of the present invention. The difference between the second embodiment and the first embodiment lies in the modification of the first conductive structure 4 and the second conductive structure 5, specifically:

[0055] In this embodiment, the first conductive structure 4 includes a first elastic contact pin 42, and the second conductive structure 5 includes a second elastic contact pin 52 and a third conductive wire 53. The first elastic contact pin 42 and the second elastic contact pin 52 are respectively disposed on the circuit board 3. The end of the first elastic contact pin 42 abuts against the first electrode surface 21, and the end of the second elastic contact pin 52 abuts against an insulating area (not shown in the figure) disposed on the first electrode surface 21. One end of the third conductive wire 53 is connected to the second elastic contact pin 52, and the other end of the third conductive wire 53 passes through the clearance space 6 and connects to the second electrode surface 22. The advantage of this structure is that, firstly, springs are respectively disposed inside the first elastic contact pin 42 and the second elastic contact pin 52. The springs can provide continuous pressure for the contact between the end of the first elastic contact pin 42 and the first electrode surface 21, ensuring that the first elastic contact pin 42 and the first electrode surface 21 are always in close contact. This close contact can reduce the contact resistance between the first elastic contact pin 42 and the first electrode surface 21, thereby improving the conductivity stability. Similarly, the spring can also provide continuous pressure for the contact between the end of the second elastic contact pin 52 and the insulating area provided on the first electrode surface 21, thereby ensuring that the second elastic contact pin 52 always abuts against the insulating area. The second elastic contact pin 52 serves as a support, preventing the piezoelectric ceramic 2 from shifting due to the force of the first elastic contact pin 42 alone. On the other hand, the second elastic contact pin 52 serves to connect the third conductive line 53 and the circuit board 3. Secondly, during the use of the ultrasonic focusing transducer 100, when vibration occurs due to external factors, the piezoelectric ceramic 2 and the circuit board 3 may experience slight displacement. The first elastic contact pin 42 and the second elastic contact pin 52 can compensate for this slight displacement to ensure a stable connection between the first elastic contact pin 42 and the first electrode surface 21, as well as a stable connection between the second elastic contact pin 52 and the second electrode surface 22.

[0056] Other technical features and effects are the same as in the first embodiment, and will not be repeated here. Please refer to the above description for details. Figures 1-4 Explanation.

[0057] Please refer to Figures 6-7 , Figure 6 This is a cross-sectional schematic diagram of the third embodiment of the present invention. Figure 7 This is a three-dimensional structural diagram of the shell 1 in the third embodiment of this utility model. The difference between the third embodiment and the first embodiment lies in the change of the structure of the clearance space 6, specifically:

[0058] In this embodiment, a channel 62 is provided inside the housing 1. The channel 62 includes an inlet 621 and an outlet 622. The projection of the inlet 621 on the cross-section T is located between the projections of the piezoelectric ceramic 2 and the circuit board 3 on the cross-section T, which means that the inlet 621 is connected to the first wiring space 7. The projection of the outlet 622 on the cross-section T is located below the projection of the piezoelectric ceramic 2 on the cross-section T, which means that the outlet 622 is connected to the second wiring space 8. The area enclosed by the inner wall of the channel 62 is the aforementioned clearance space 6. One end of the second conductive structure 5 is connected to the circuit board 3, and the other end of the second conductive structure 5 passes through the inlet 621 and the outlet 622 in sequence until it enters the second wiring space 8 and is connected to the second electrode surface 22.

[0059] The advantage of using channel 62 instead of recessed structure 61 is that, since recessed structure 61 is an open recess located on the inner wall of housing 1, the second conductive structure 5, even when placed within recessed structure 61, remains exposed to the internal environment of housing 1. When the ultrasonic focusing transducer 100 vibrates due to external environmental factors, the second conductive structure 5 is at risk of rubbing against the piezoelectric ceramic 2, causing wear and affecting piezoelectric efficiency. Channel 62, being a closed structure, completely encloses the second conductive structure 5, isolating it from the interior of housing 1 and avoiding the risk of friction between the second conductive structure 5 and the piezoelectric ceramic 2. This improves the long-term reliability of the ultrasonic focusing transducer 100.

[0060] Other technical features and effects are the same as in the first embodiment, and will not be repeated here. Please refer to the above description for details. Figures 1-4 Explanation.

Claims

1. An ultrasonic focusing transducer, characterized by, include: The package includes a housing, a piezoelectric ceramic, and a circuit board. The four sides of the piezoelectric ceramic and the four sides of the circuit board abut against the inner wall of the housing. The piezoelectric ceramic includes a first electrode surface and a second electrode surface, with the first electrode surface positioned opposite to the circuit board. It also includes a first conductive structure and a second conductive structure. The two ends of the first conductive structure are respectively connected to the circuit board and the first electrode surface. One end of the second conductive structure is connected to the circuit board, and the other end of the second conductive structure passes through the clearance space provided in the inner wall of the housing and is connected to the second electrode surface.

2. The ultrasonic focusing transducer according to claim 1, characterized in that: The bottom surface of the circuit board, the inner wall of the housing, and the first electrode surface together form a first wiring space, and the second electrode surface and the inner wall of the housing together form a second wiring space. The first wiring space is connected to the second wiring space through the clearance space. The first conductive structure is located in the first trace space, one end of the second conductive structure is located in the first trace space, and the other end of the second conductive structure is located in the second trace space.

3. The ultrasonic focusing transducer according to claim 2, characterized in that: The first conductive structure includes a first conductive line, with both ends of the first conductive line connected to the circuit board and the first electrode surface, respectively. The second conductive structure includes a second conductive line, with one end of the second conductive line connected to the circuit board and the other end of the second conductive line passing through the clearance space and connected to the second electrode surface.

4. The ultrasonic focusing transducer according to claim 2, characterized in that: The first conductive structure includes a first elastic contact pin, and the second conductive structure includes a second elastic contact pin and a third conductive wire. The first elastic contact pin and the second elastic contact pin are respectively disposed on the circuit board. The end of the first elastic contact pin abuts against the first electrode surface, the end of the second elastic contact pin abuts against an insulating area disposed on the first electrode surface, and one end of the third conductive wire is connected to the second elastic contact pin, and the other end of the third conductive wire passes through the clearance space and is connected to the second electrode surface.

5. The ultrasonic focusing transducer according to any one of claims 2-4, characterized in that: The inner wall of the housing has a first step and a second step that protrude radially. The first step is located above the second step. The circuit board is disposed on the first step, and the piezoelectric ceramic is disposed on the second step.

6. The ultrasonic focusing transducer according to claim 5, characterized in that: The inner wall of the shell is recessed with a recessed structure, and the area enclosed by the inner wall of the recessed structure is the clearance space.

7. The ultrasonic focusing transducer according to claim 6, characterized in that: The recessed structure includes a first recessed substructure and a second recessed substructure that are interconnected. The first recessed substructure is recessed into the inner wall of the shell, and the second recessed substructure is recessed into the top surface of the second step.

8. The ultrasonic focusing transducer according to claim 7, characterized in that: The projection of the first recessed substructure onto a cross section passing through the central axis of the housing has a first angle with the projection of the second recessed substructure onto a cross section passing through the central axis of the housing.

9. The ultrasonic focusing transducer according to claim 5, characterized in that: The inner wall of the housing is provided with a channel, and the area enclosed by the inner wall of the channel is the clearance space.

10. The ultrasonic focusing transducer according to claim 9, characterized in that: The channel includes an inlet and an outlet. The projection of the inlet in the cross section is located between the projection of the piezoelectric ceramic in the cross section and the projection of the circuit board in the cross section. The projection of the outlet in the cross section is located below the projection of the piezoelectric ceramic in the cross section.

11. The ultrasonic focusing transducer according to claim 5, characterized in that: The top surface of the second step is provided with a protruding structure. The inner wall of the protruding structure, the top surface of the second step, and the inner wall of the shell together form a placement space, in which the piezoelectric ceramic is placed.

12. The ultrasonic focusing transducer according to claim 11, characterized in that: The protruding structure has a second angle relative to the top surface of the second step, and the second angle is greater than or equal to 90°.

13. The ultrasonic focusing transducer according to claim 11, characterized in that: The protruding structure is arc-shaped.

14. The ultrasonic focusing transducer according to claim 5, characterized in that: The first stepped portion has a first distance from the central axis of the housing, and the second stepped portion has a second distance from the central axis of the housing, wherein the first distance is greater than the second distance.

15. The ultrasonic focusing transducer according to claim 1, characterized in that: The second electrode surface is concave.

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