FPC (Flexible Printed Circuit) wire rod and ultrasonic sensor applying same

Abstract

The utility model relates to an FPC wire rod and an ultrasonic sensor using the same, and relates to the sensor technology field, the FPC wire rod comprises a flat FPC wire rod body, the FPC wire rod body comprises at least one first wire rod body, each first wire rod body is provided with a first welding spot and a second welding spot which are arranged at intervals, and the first welding spot and the second welding spot are arranged at intervals. The first welding spot can be welded with a positive electrode or a negative electrode of a piezoelectric ceramic vibrator, the second welding spot is located at one end of the first wire body, and a conductive section capable of enabling the first welding spot and the second welding spot to be electrically connected is arranged between the first welding spot and the second welding spot. Therefore, the constraint on the piezoelectric ceramic vibrator is reduced, the overall thickness of the piezoelectric ceramic vibrator is reduced, and the sensitivity upper limit of the sensor is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to sensor technical field especially relates to a kind of FPC wire and the ultrasonic sensor of application this wire. BACKGROUND

[0002] Ultrasonic sensor is a kind of equipment using ultrasonic technology to measure, detect and monitor, is widely used in distance measurement, object detection, liquid level monitoring, obstacle avoidance and other fields, its working principle is by emitting ultrasonic signal, and receiving the signal reflected back, according to the propagation time difference or intensity variation to calculate the distance or other physical quantities of target object, ultrasonic sensor is usually composed of piezoelectric ceramic vibrator, electronic circuit and related mechanical structure, wherein piezoelectric ceramic vibrator is responsible for the emission and reception of ultrasonic wave, and electronic circuit controls signal emission and reception, signal processing and data output.

[0003] However, there are still certain technical challenges in the design and manufacturing process of existing ultrasonic sensors, especially in the vibrator design and connection structure, current ultrasonic sensors generally adopt traditional cylindrical electronic wire connection mode, usually by welding method to connect electronic wire with piezoelectric ceramic vibrator, although this structure is simple and easy to realize, but it has an important defect-the height of welding point is usually too high.

[0004] The height of welding point will directly affect the structure and performance of piezoelectric ceramic vibrator, due to the existence of welding point, the thickness of piezoelectric ceramic vibrator is additionally increased, which not only leads to the increase of the overall size of ultrasonic sensor, but also may have adverse effects on the vibration characteristics of vibrator, specifically, higher welding point will increase the constraint effect of vibrator, and then limit its free vibration space and amplitude, piezoelectric ceramic vibrator usually needs to be designed and optimized within a relatively accurate thickness range to ensure its sensitivity and frequency response, when welding point is too high, the actual effective thickness of piezoelectric ceramic vibrator increases, leading to the decrease of its frequency response and sensitivity, and then affecting the working performance of ultrasonic sensor.

[0005] More importantly, the structure with too high welding point will change the natural frequency and response characteristics of vibrator system to some extent, thereby limiting the upper limit of sensor sensitivity, for high-precision application scenarios, the sensitivity of sensor is a crucial index, improper design of welding point may make the performance of ultrasonic sensor not reach the ideal level, affecting its application in high-demand fields such as industry, medical treatment and automation.

[0006] The utility model is proposed to solve the technical problems in the prior art. UTILITY MODEL CONTENT

[0007] The welding point of the electronic wire is too high, and the height of the welding point is also included in the thickness of the piezoelectric ceramic vibrator, the too high welding point increases the thickness of the piezoelectric ceramic vibrator, and the piezoelectric ceramic vibrator is too large, so that the sensitivity of the ultrasonic sensor is affected, and the upper limit of the sensitivity of the ultrasonic sensor is affected.

[0008] The technical scheme adopted by the utility model to solve its technical problems is:

[0009] An FPC wire, comprising a flat FPC wire body, the FPC wire body comprising at least one first wire body, each first wire body being provided with a first welding point and a second welding point arranged at intervals, the first welding point being capable of being welded with a positive electrode or a negative electrode of a piezoelectric ceramic vibrator, the second welding point being located at one end of the first wire body, and a conductive segment capable of electrically connecting the first welding point and the second welding point being arranged between the first welding point and the second welding point.

[0010] The first welding point on one of the first wire bodies is welded with the positive electrode of the piezoelectric ceramic vibrator, and the first welding point on the other first wire body is welded with the negative electrode of the piezoelectric ceramic vibrator; the FPC wire body further comprises a connecting segment arranged between the two first wire bodies, and the two first welding points are located on both sides of the connecting segment.

[0011] The connecting segment is provided with an insulating layer, and the insulating layer can insulate the two first wire bodies.

[0012] The two first wire bodies are arranged in a central symmetry with the center point of the connecting segment as the center.

[0013] Each conductive segment comprises a metal foil.

[0014] Each conductive segment comprises two metal foils, each metal foil being in a wire-like shape, and the two metal foils being in an interlaced spiral shape.

[0015] The first welding point comprises a circular pad with an opening in the middle.

[0016] The FPC wire body is in a straight line-like shape.

[0017] An ultrasonic sensor, comprising a piezoelectric ceramic vibrator and an FPC wire as claimed in any one of the preceding claims.

[0018] The utility model discloses a beneficial effect is:

[0019] The utility model discloses a kind of FPC wire rod and ultrasonic sensor applying the wire rod, it is related to sensor technical field, wherein, FPC wire rod includes the FPC wire rod body of flat, the FPC wire rod body includes at least one first wire rod body, each first wire rod body is equipped with the first soldering point and second soldering point of interval arrangement, the first soldering point can be welded with the positive pole or negative pole of piezoelectric ceramic vibrator, the second soldering point is located in one end of first wire rod body, the first soldering point and second soldering point between are equipped with the electrically conductive section that can make both electrical connection, by adopting the FPC wire rod body of flat, the soldering point height of first soldering point can be effectively reduced, to reduce the restraint to piezoelectric ceramic vibrator, reduce the overall thickness of piezoelectric ceramic vibrator, to improve the upper limit of sensor sensitivity.

[0020] The utility model will be further described below in connection with the drawings and specific embodiment. DRAWINGS

[0021] Fig. 1 It is the top view schematic diagram of the FPC wire rod of the utility model;

[0022] Fig. 2 It is the top view schematic diagram of the ultrasonic sensor of the utility model. SPECIFIC EMBODIMENT

[0023] The embodiment of the utility model will be described in detail in connection with the drawings below.

[0024] As Figs. 1-2 Shown, a kind of FPC wire rod of the embodiment, including the FPC wire rod body 1 of flat, the FPC wire rod body 1 includes at least one first wire rod body 11, each first wire rod body 11 is equipped with the first soldering point 111 and second soldering point 112 of interval arrangement, the first soldering point 111 can be welded with the positive pole or negative pole of piezoelectric ceramic vibrator, the second soldering point 112 is located in one end of first wire rod body 11, the first soldering point 111 and second soldering point 112 between are equipped with the electrically conductive section 113 that can make both electrical connection.

[0025] Specifically, FPC wire rod body 1 is flat, unlike traditional cylindrical electronic wire, since FPC wire rod has larger contact surface, the height of soldering point can be effectively controlled, and the FPC wire rod body 1 of flat design can effectively reduce the height of soldering point, to reduce the restraint to piezoelectric ceramic vibrator, reduce the overall thickness of piezoelectric ceramic vibrator, to improve the upper limit of sensor sensitivity.

[0026] And, the interval arrangement of the first solder joint 111 and the second solder joint 112 is electrically connected through the conductive segment 113, so that the soldering area is relatively uniform, avoiding the stress and thickness increase problems caused by concentrated soldering. In this way, the soldering structure can be more delicate, and the additional influence on the piezoelectric ceramic vibrator (such as the core component in the ultrasonic sensor) in the soldering process is reduced.

[0027] And, the first solder joint and the second solder joint are electrically connected through the conductive segment 113, which can ensure the effective transmission of electronic signals and avoid the problems of unstable or unreliable electrical connection that may be caused in traditional soldering structures.

[0028] By adopting the flat FPC wire body, the height of the solder joint can be significantly reduced, which not only reduces the influence of the solder joint on the physical structure of the piezoelectric ceramic vibrator, but also avoids the problem of increasing the thickness of the vibrator caused by the too high solder joint. The smaller solder joint height can reduce the overall height of the vibrator and reduce the binding effect of the vibrator.

[0029] The reduction of the solder joint height helps to reduce the binding of the piezoelectric ceramic vibrator, so that it can vibrate more freely, which directly affects the sensitivity and frequency response of the vibrator. After reducing the binding, the vibration amplitude and frequency response of the piezoelectric ceramic vibrator are optimized, thereby improving the upper limit of the sensitivity of the ultrasonic sensor and further improving the measurement accuracy and detection ability.

[0030] Reducing the solder joint height and the binding effect can effectively control the thickness of the entire sensor, and the size of the ultrasonic sensor can be reduced.

[0031] Further, the use of FPC wire can reduce the risk of stress concentration and uneven soldering during the soldering process. FPC itself has good flexibility and variability, which helps to improve the stability of the soldering process and improves the long-term reliability and consistency of the sensor.

[0032] And, the flat FPC wire body 1 is lighter and thinner, which can be welded by machine welding technology, using fixtures and laser welding machines. The machine welding uses fixtures, and then the laser welding machine is used to complete the point soldering at the specified position and melt the solder paste by laser irradiation to complete the welding. The combination of machine welding and laser welding technology can realize efficient automation production, reduce manual intervention and errors, and make the welding process more stable and efficient. The automatic process not only speeds up the production speed, but also can produce stably on a large scale, improves the production efficiency of the production line, and the laser welding can more accurately control the melting process of the solder paste, so as to ensure that the solder joint is small and uniform, thereby improving the production efficiency and yield of the FPC wire.

[0033] For example, Figs. 1-2As shown, the number of first wire bodies 11 in this embodiment is two, one of which is welded to the positive electrode of the piezoelectric ceramic vibrator, and the other of which is welded to the negative electrode of the piezoelectric ceramic vibrator; the FPC wire body 1 further comprises a connecting section 12 arranged between the two first wire bodies 11, and the two first welding points 111 are located on both sides of the connecting section 12.

[0034] Specifically, each first wire body 11 is provided with a first welding point 111, one of which is connected to the positive electrode of the piezoelectric ceramic vibrator, and the other of which is connected to the negative electrode. The purpose of this is to ensure the stability of the electrical connection and signal transmission of the sensor by connecting the positive and negative electrodes with two different wires.

[0035] The two first wire bodies 11 are connected to each other by the connecting section 12 to form a unified FPC wire body 1. This design makes the two wires physically more closely combined together to form a larger FPC wire structure, while also improving the overall stability and strength.

[0036] Since the connecting section 12 connects the two wire bodies 11 into a single whole, the assembly process no longer needs to separately position and connect two independent wires, but rather directly assembles the entire FPC wire body 1. In this way, the assembly time and manual operation on the production line can be reduced, and the assembly efficiency is greatly improved.

[0037] Since the FPC wire body 1 is composed of two first wire bodies 11 and a connecting section 12, the workload of the welding and assembly process is greatly reduced, and in the production process, the entire wire can be directly fixed and welded without the need to handle multiple independent wires separately, thereby improving the assembly efficiency. This design can achieve a 100% improvement in assembly efficiency, especially in mass production, which can significantly improve production speed and reduce labor costs.

[0038] Moreover, connecting the two wire bodies together through the connecting section 12 eliminates the need to butt joint multiple wires separately, avoiding assembly problems caused by positional errors or inaccurate butt jointing. The connecting section provides a stable fixing structure, ensuring the relative positions of the two wires are accurate and consistent, thereby reducing errors in the welding process, making the welding point position more accurate, and improving the consistency and stability of the product.

[0039] By combining the two wire bodies, the physical volume of the FPC wire is increased, and the overall structure becomes more robust, which not only helps to improve the tensile strength and durability of the wire, but also enhances the stability of the FPC wire during assembly, avoiding the problem of thin or soft FPC wires being easily bent or deformed.

[0040] And, each first wire body 11 is connected to the positive and negative poles of the piezoelectric ceramic vibrator respectively, so that the electrical connection is stable, and the electrical isolation between the two wires is more clear. The design of the connecting section 12 ensures that the electrical connection remains stable, while avoiding electrical interference and loss in signal transmission.

[0041] And, the positive and negative poles of the piezoelectric ceramic vibrator can be electrically connected using one FPC wire, further improving the assembly efficiency between the FPC wire and the sensor.

[0042] As shown in Figs. 1-2 The connecting section 12 of the embodiment is provided with an insulating layer, which can insulate the two first wire bodies 11.

[0043] Specifically, the insulating layer is provided in the connecting section 12, which mainly provides electrical isolation, so that the connecting section 12 completely electrically isolates the two first wire bodies 11, which means that the two wire bodies are not electrically connected to each other, avoiding electrical performance problems caused by short circuit or electrical interference.

[0044] Further, the two first wire bodies 11 are respectively connected to the positive and negative poles of the piezoelectric ceramic vibrator, so that the electrical independence needs to be maintained to ensure the normal operation and accuracy of signal transmission. By adding an insulating layer in the connecting section 12, the insulating layer can ensure that the two first wire bodies 11 do not form an electrical connection in the middle part of the connecting section 12, and ensure that when they are respectively connected to the positive and negative poles of the piezoelectric ceramic vibrator, the electrical function is not disturbed, avoiding the possible electrical short circuit or misconnection between the two wires.

[0045] The insulating layer ensures the electrical independence between the two first wire bodies 11, which is crucial to ensure the stability of signal transmission. If there is no effective electrical isolation between the two wire bodies, short circuit or electrical interference may occur, which will affect the operation of the piezoelectric ceramic vibrator and cause the performance of the sensor to decline. By providing an insulating layer, electrical isolation is ensured, and the signal transmission of the sensor is not disturbed.

[0046] Preferably, the connecting section 12 itself is designed by the insulating layer, which will not cause electrical interference with other parts. Even if the connecting section 12 plays a mechanical supporting role in the electrical structure of the sensor, the insulating layer ensures that it remains isolated in electrical performance and does not adversely affect the operation of the sensor.

[0047] The insulation layer separates the electrical isolation problem from the mechanical design, reduces the need for complex electrical wiring, simplifies the entire design process, and in addition, the guarantee of electrical independence makes the entire FPC wire design more reliable, reducing the risk of failure due to design defects. This not only improves the long-term reliability of the product, but also reduces maintenance costs.

[0048] Preferably, the FPC wire in the embodiment, wherein the two first wire bodies 11 are integrated into the same FPC wire, and the middle part (i.e. the connecting section 12) of the FPC wire removes the conductive layer and only retains the base material, which is directly pasted at the center position of the sensor.

[0049] In the design, the connecting section 12 of the FPC wire removes the conductive layer and only retains the base material (usually flexible material such as polyimide or polyester film), which ensures that the connecting section 12 has no electrical conductivity, so this part will not interfere with the electrical signal, and only retaining the base material makes this part not affect the electrical isolation and independent work of the two first wire bodies 11 when installed at the center position of the sensor.

[0050] Moreover, the connecting section 12 is composed of only the base material, which can be more flexible to fit the center position of the sensor, ensuring the close connection between the wire body and the sensor, and there will be no electrical problems caused by the presence of the conductive layer. The flexibility of the base material makes it easier to make close contact with the surface of the sensor during installation, enhancing the mechanical stability.

[0051] Since the two first wire bodies 11 are integrated into the same FPC wire, the design achieves a simplified wiring structure, avoiding the problem of needing multiple independent wires for connection. The integrated FPC wire can maintain consistent shape and structure during assembly, improving assembly efficiency.

[0052] Further, since the connecting section 12 removes the conductive layer, the middle part of the FPC wire becomes more flexible and does not contain conductive material, so it can be directly pasted when installed at the center position of the sensor, ensuring that the FPC wire can be more closely attached to the surface of the sensor. This design effectively improves the accuracy during assembly, avoids electrical interference, and improves the stability of installation, ensuring stability during long-term operation.

[0053] By retaining only the base material, the middle part of the FPC wire becomes more flexible and weak, allowing it to better adapt to the shape and structure of the sensor. When pasted at the center position of the sensor, this flexible base material can better adhere to the surface of the sensor, thereby improving the stability of mechanical connection and avoiding performance problems caused by poor adhesion or misalignment.

[0054] As Figs. 1-2As shown, in order to minimize the impact on the sensor's operating mode, the two first wire bodies 11 described in this embodiment are arranged in a centrally symmetrical manner with respect to the center point of the connecting segment 12, that is, the first solder joint 111 is arranged in a centrally symmetrical manner with respect to the center point of the connecting segment 12.

[0055] Preferably, the center point of the connecting segment 12 in this embodiment coincides with the center of the sensor. This design ensures that the solder joints of the FPC wire are symmetrically distributed relative to the center of the sensor. The two first solder joints are located at symmetrical positions on the same circumference with the center of the sensor as the center. The two solder joints are located on the same circumference with the center of the sensor as the center, and the two solder joints are completely symmetrical in space. Due to the symmetry of the solder joint positions, it can be ensured that the mechanical influence of the two solder joints on the sensor is balanced, and it will not lead to asymmetrical mechanical stress distribution or unbalanced electrical interference.

[0056] Furthermore, the welding points have a certain influence on the sensor's operating modes (such as vibration modes or sound wave propagation modes). Through symmetrical layout, the influence of the two welding points is uniform in space and will not produce any offset or distortion effects. This allows the sensor's operating modes to maintain symmetry during vibration or sound wave propagation, ensuring its performance stability and accuracy.

[0057] Moreover, the performance of a sensor (especially an ultrasonic sensor) is closely related to its operating mode, particularly the characteristics of sound wave propagation. By symmetrically distributing solder joints, stress concentration or local vibration mode imbalance caused by structural asymmetry can be reduced, thereby optimizing the propagation path and efficiency of sound waves. The symmetrical solder joint layout makes the sensor's operating mode closer to the ideal state, thus improving the stability and uniformity of its sound wave propagation.

[0058] Furthermore, symmetrical solder joint design can effectively eliminate the mechanical imbalance caused by the asymmetry of solder joint positions. The sensor's operating modes (such as vibration modes) are affected by the position of the solder joints and additional mechanical interference on the sensor surface. By setting the solder joints to be centrally symmetrical, the performance stability of the sensor is ensured, and performance fluctuations caused by position errors are avoided.

[0059] Furthermore, the centrally symmetrical layout simplifies the production and assembly process. The symmetrical design of the welding points and FPC wires simplifies the installation and adjustment steps, reducing the requirement for precise positioning of the sensor center point. This not only improves production efficiency but also ensures the consistency and high quality of each sensor during the production process.

[0060] like Figs. 1-2 As shown, each of the conductive segments 113 in this embodiment includes a metal foil, which can provide a low-resistance, high-efficiency current transmission path, ensuring signal stability and transmission accuracy.

[0061] Moreover, metal foils generally have high mechanical strength and durability, providing reliable physical support to ensure that the FPC wire does not cause poor electrical contact or line breakage due to bending or stretching during long-term use. At the same time, metal foils are also flexible and can adapt to different shapes and space requirements, facilitating precise adhesion to the surface of the sensor.

[0062] Preferably, each of the conductive segments 113 of the present embodiment includes two metal foils, each of which is in the form of a wire, and the two metal foils are in the form of an interwoven spiral. This spiral structure enhances the mechanical properties of the entire conductive segment through the interweaving of two or more layers of metal foils. The spiral structure itself has the ability to distribute torsion and stretching, which can effectively disperse external forces and reduce local stress concentration of the material. This can greatly improve the mechanical stability and pressure resistance of the FPC wire during long-term use, especially when it may be subjected to vibration, impact or pressure in the working environment.

[0063] Preferably, the interwoven spiral structure provides mutual support among the multiple layers of metal foils, making the FPC wire more uniform under stress and improving overall strength. Compared to traditional single metal foil structures, the spiral interwoven design has stronger mechanical strength and can effectively resist external pressure or physical impact.

[0064] FPC wires are usually subjected to tensile and bending stress during installation or use. The spiral interwoven structure, through the spiral arrangement of metal foils, gives the FPC wire stronger tensile resistance. When subjected to external tensile force, the force is evenly distributed on the entire metal foil, avoiding local breakage or damage.

[0065] At the same time, the spiral structure also enhances the bending resistance of the FPC. When bending or twisting, the metal foil will deform flexibly and is not easily broken, thereby improving the durability of the FPC wire.

[0066] Moreover, due to the interwoven nature of the spiral structure, even if part of the metal foil is damaged or broken, the overall conductive path can still continue to be effective through other parts, thereby reducing the risk of complete power failure or open circuit caused by damage to a single foil layer, and improving the fault tolerance and reliability of the FPC wire.

[0067] In addition to improving mechanical properties, the spiral structure can also provide more stable electrical connections. The two interwoven metal foil layers can enhance the stability of electrical contact, reduce poor electrical contact caused by external forces or environmental factors, and improve the stability of electrical connections, especially in high-speed signal transmission and high-precision applications.

[0068] In other embodiments, the conductive segment 113 is a whole piece of metal foil, and the appropriate design can be selected according to actual needs.

[0069] As shown in Figs. 1-2 The first solder joint 111 of the embodiment includes a circular pad with an opening in the middle, which helps to evenly distribute the welding heat and reduce stress concentration during the welding process. The design of the opening in the middle further optimizes the physical structure of the solder joint, allowing better control of the flow and distribution of solder during the welding process, avoiding the problem of too much or too little solder.

[0070] Moreover, the main function of the pad opening design is to reduce the height of the solder joint while effectively controlling the material flow during the welding process. The opening design allows the solder to flow to the welding area during the heating process, avoiding excessive accumulation of solder, thereby effectively compressing the height of the solder joint and further reducing the increase in solder joint size.

[0071] As shown in Figs. 1-2 The FPC wire body 1 of the embodiment has a shape similar to a straight line, i.e. the wire is basically straight in overall shape, although there may be slight bends or twists at certain positions. The overall design maintains a relatively simple linear layout, which occupies the smallest area in space and facilitates arrangement and installation in various devices and systems.

[0072] The linear design of the FPC wire body 1 allows it to be laid out or arranged in a straight line, simplifying the wiring process. Especially in circuits that require a large number of line connections, this design helps to reduce unnecessary turns or curves, reducing interference and loss in signal transmission.

[0073] The linear shape allows for more flexible adaptation to different space constraints during installation, especially in environments with limited space or complex shapes. The linear wire facilitates efficient layout and maximizes the use of limited space.

[0074] The linear FPC wire body is relatively stable after installation and is not easily affected by external forces. Compared to excessive bending or complex shapes, the linear design makes the FPC more mechanically stable, reducing the risk of damage or deformation caused by external forces.

[0075] As shown in Figs. 1-2 The ultrasonic sensor of the embodiment includes a piezoelectric ceramic vibrator 2 and an FPC wire as described in any of the above embodiments. This design not only allows for more uniform welding process and avoids local stress concentration.

[0076] The flat design of the FPC wire body effectively reduces the height of the solder joint, which helps to reduce the constraint on the physical structure of the piezoelectric ceramic vibrator. Especially during vibration or dynamic changes, smaller solder joints can reduce interference with the performance of the vibrator, thereby improving the upper limit of the sensitivity of the sensor.

[0077] And because the height of the welding points is effectively controlled, the thickness of the entire sensor is significantly reduced, which not only helps to reduce the volume and size of the device, but also to a certain extent, reduces the binding effect of the piezoelectric ceramic vibrator, improves its working efficiency, increases its sensitivity and response speed.

[0078] Further, the design of the flat FPC wire body and the interval arranged welding points can improve the fineness of the entire welding structure, reduce errors in the production process, make the welding more uniform, the structure more stable, and improve the reliability and durability of the ultrasonic sensor, especially in the case of long-term high-frequency use, which can ensure that the performance of the sensor is not affected.

[0079] Further, by reducing the height of the welding points and the overall thickness of the piezoelectric ceramic vibrator, the volume of the device can be effectively reduced.

[0080] The above is only to further illustrate the technical content of the present application by way of examples, so that the reader can more easily understand, but it does not mean that the embodiments of the present application are limited to this, any technical extension or re-creation made according to the present application is protected by the present application. The scope of protection of the present application is subject to the claims.

Claims

1. An FPC wire characterized by, The FPC wire body (1) includes at least one first wire body (11), each of the first wire bodies (11) is provided with a first welding point (111) and a second welding point (112), the first welding point (111) can be welded with the positive or negative electrode of the piezoelectric ceramic vibrator, the second welding point (112) is located at one end of the first wire body (11), and a conductive section (113) electrically connecting the first welding point (111) and the second welding point (112) is arranged between the first welding point (111) and the second welding point (112).

2. The FPC wire according to claim 1, wherein The number of the first wire bodies (11) is two, the first welding point (111) on one of the first wire bodies (11) is welded with the positive electrode of the piezoelectric ceramic vibrator, and the first welding point (111) on the other first wire body (11) is welded with the negative electrode of the piezoelectric ceramic vibrator; the FPC wire body (1) further includes a connecting section (12) arranged between the two first wire bodies (11), and the two first welding points (111) are located on the two sides of the connecting section (12).

3. The FPC wire according to claim 2, wherein An insulating layer is arranged in the connecting section (12), and the two first wire bodies (11) are insulated by the insulating layer.

4. The FPC wire according to claim 2, wherein The two first wire bodies (11) are centrally symmetrically arranged with the center point of the connecting section (12) as the center.

5. The FPC wire according to any one of claims 1 to 4, wherein Each of the conductive sections (113) includes a metal foil.

6. The FPC wire according to claim 5, wherein Each of the conductive sections (113) includes two metal foils, each of the metal foils is in a wire-like shape, and the two metal foils are in an interlaced spiral shape.

7. The FPC wire according to any one of claims 1 to 4, wherein The first welding point (111) includes a circular pad with an opening in the middle.

8. The FPC wire according to any one of claims 1 to 4, wherein The FPC wire body (1) is in a straight line-like shape.

9. An ultrasonic sensor, characterized by The FPC wire body (1) is in a straight line-like shape. The FPC wire body (1) is in a straight line-like shape. The FPC wire body (1) is in a straight line-like shape.

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