Piezoelectric assembly and ultrasonic transducer
By setting up a mounting area and a conductive layer on the side of the ultrasonic transducer body to connect the electrode wires, the problem of reduced effective working area of the piezoelectric chip caused by welding leads is solved, and the performance of the ultrasonic transducer is maintained and the cost is reduced.
Patent Information
- Application Number
- CN202421215380.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-30
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-05-30
AI Technical Summary
In the existing technology, the size of the solder joints of the welding leads is difficult to control, resulting in a reduction in the effective working area of the piezoelectric chip, reducing the sensitivity and sound power of the ultrasonic transducer, and failing to meet scenarios with high sensitivity or sound power requirements.
A mounting area is set on the side of the ultrasonic transducer body, and the electrode wire is connected to the first electrode through bonding and a conductive layer to avoid electrode flanging and ensure that the electrode wire is connected to the first electrode without occupying the electrode coverage area.
The invention effectively avoids the performance degradation of the ultrasonic transducer, increases the effective working area, reduces the manufacturing cost, and simplifies the manufacturing process steps.
Smart Images
Figure CN223300365U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of transducers, in particular to a piezoelectric component and an ultrasonic transducer. Background Art
[0002] An ultrasonic transducer is a device that converts electromagnetic energy into mechanical vibration energy. It is usually composed of a piezoelectric chip, a matching layer, and an electrode. The matching layer can ensure the sensitivity and accuracy of the ultrasonic transducer. By connecting the electrode to a wire, a voltage is generated on the piezoelectric chip, causing the piezoelectric chip to vibrate.
[0003] In the prior art, since the size of the solder joints of the welding leads is difficult to control, the electrodes on one side of the piezoelectric chip are usually flanged to the same side of the electrodes on the other side to facilitate the welding lead operation; however, the provision of the electrode flange reduces the effective working area of the piezoelectric chip, thereby reducing the sensitivity and acoustic power of the transducer, and is not suitable for scenarios with high requirements for sensitivity or acoustic power.
[0004] That is, the use of electrode flange leads has the disadvantage of reducing the effective working area of the piezoelectric chip, thereby reducing the sensitivity and acoustic power of the transducer. Utility Model Content
[0005] The purpose of the utility model is to provide a piezoelectric component and an ultrasonic transducer, which can effectively avoid the performance degradation of the ultrasonic transducer while ensuring the space for electrode leads.
[0006] To achieve this purpose, the present invention adopts the following technical solutions:
[0007] The utility model provides a piezoelectric component, which includes:
[0008] A body, comprising a piezoelectric element and a first electrode, wherein the piezoelectric element has an electrode covering surface, the first electrode is laminated and arranged on the electrode covering surface, and a mounting area is provided on a side surface of the body;
[0009] An electrode wire is provided at the location of the installation area, and the electrode wire is adhered to the piezoelectric component and communicated with the first electrode.
[0010] As an optional technical solution for a piezoelectric component, the installation area is a installation plane or a installation notch.
[0011] As an optional technical solution for a piezoelectric component, the electrode wire portion is attached to the installation area, and the end of the electrode wire is connected to the first electrode.
[0012] As an optional technical solution of a piezoelectric component, the end of the electrode wire is flush with the surface of the first electrode facing away from the piezoelectric component.
[0013] As an optional technical solution of a piezoelectric component, a conductive layer is provided at the connection between the electrode wire and the first electrode, the conductive layer is located on the installation area, and the electrode wire is connected to the first electrode through the conductive layer.
[0014] As an optional technical solution for a piezoelectric component, the conductive layer is formed by solidifying a conductive silver paste material.
[0015] As an optional technical solution for a piezoelectric component, the piezoelectric element is disk-shaped, the disk surface of the piezoelectric element is the electrode covering surface, and the mounting area is arranged on the peripheral side surface of the body and extends in a direction perpendicular to the disk surface.
[0016] As an optional technical solution for a piezoelectric component, the electrode wire includes:
[0017] Conductive wires, used to transmit signals;
[0018] The insulating layer is coated on the outside of the conductive wire and is used to protect the conductive wire.
[0019] As an optional technical solution for a piezoelectric component, the piezoelectric element is made of a piezoelectric crystal material.
[0020] The utility model provides an ultrasonic transducer, which comprises the piezoelectric component mentioned above.
[0021] Beneficial effects:
[0022] The utility model provides a piezoelectric assembly, comprising a body and an electrode wire. The body comprises a piezoelectric element and a first electrode. The piezoelectric element has an electrode covering surface, and the first electrode is laminated and disposed on the electrode covering surface. A mounting area is provided on the side of the body. The electrode wire is located in the mounting area, adhered to the piezoelectric element, and communicates with the first electrode. By providing the mounting area on the side of the body, a lead space is formed between the housing of the ultrasonic transducer and the piezoelectric element. This allows the electrode wire to communicate with the first electrode without requiring an electrode flange. The connection position of the electrode wire does not occupy the area of the electrode covering surface, effectively preventing degradation of the ultrasonic transducer's performance.
[0023] The utility model provides an ultrasonic transducer. By arranging the ultrasonic transducer with a piezoelectric component, the electrode line can be connected to the first electrode without arranging a flange, thereby ensuring the performance of the ultrasonic transducer. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 This is a schematic structural diagram of a piezoelectric assembly provided by an embodiment of the present utility model;
[0025] Figure 2 This is a schematic structural diagram of the main body of the piezoelectric component provided by an embodiment of the present utility model;
[0026] Figure 3 This is a schematic structural diagram of an electrode wire provided by an embodiment of the present utility model;
[0027] Figure 4 It is a partial structural diagram of the piezoelectric component provided by an embodiment of the present utility model.
[0028] In the picture:
[0029] 10. Piezoelectric element; 20. First electrode; 30. Second electrode; 40. Mounting area;
[0030] 50. Electrode wire; 51. Conductive wire; 52. Insulation layer. DETAILED DESCRIPTION
[0031] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.
[0032] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.
[0033] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.
[0034] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.
[0035] Ultrasonic transducers are usually composed of piezoelectric chips, matching layers, and electrodes. The matching layer is usually attached to the side of the piezoelectric chip close to the working medium to play an acoustic matching and insulation role. The thickness of the matching layer is usually one-quarter of the ultrasonic wavelength; the higher the frequency of the ultrasonic transducer, the thinner the matching layer.
[0036] Ultrasonic transducers usually use the traditional tin soldering method to directly solder the wires to the outer ring of the electrode sheet through soldering, and the size of the solder joints is difficult to control. In the process of manufacturing ultrasonic transducers, manual soldering is generally used, which is flexible, convenient and low-cost. The thickness of the matching layer of the emitting surface of the ultrasonic transducer is different in different application scenarios; if the electrode lead of the emitting surface (that is, the outer surface of the negative electrode sheet of the ultrasonic transducer) is soldered with tin, when the tin solder joint is small and the matching layer is thick, the electrode will generally not be exposed during the subsequent matching layer grinding process; but when the matching layer thickness is less than the solder joint height, the solder joint will be exposed during the subsequent matching layer grinding process, causing insulation failure (for example, when the matching layer thickness is less than 0.5mm, it is very easy to cause the electrode to be exposed after the matching layer is ground), resulting in a high product scrap rate, which is difficult to improve in the subsequent complex process implementation and process control.
[0037] If the transducer's emitting surface electrode is introduced to the back of the transducer (i.e., the electrode flange), part of the ultrasonic transducer's electric field area will be wasted, increasing the transducer's manufacturing process and cost, resulting in a decrease in the average sound power per unit area. For example, if a transducer with a 10mm diameter is flanged, the emitting surface electrode solder joint area accounts for approximately 20% of the total area, resulting in a 20% reduction in the sound power of the ultrasonic transducer with the electrode flange at the same voltage.
[0038] like Figures 1 to 4 As shown, an embodiment of the present invention provides an ultrasonic transducer, which includes a piezoelectric component, which includes a main body and an electrode wire 50. The main body includes a piezoelectric part 10 and a first electrode 20. The piezoelectric part 10 has an electrode covering surface, and the first electrode 20 is adhered to the electrode covering surface. The side of the main body is provided with an installation area 40; the electrode wire 50 is arranged at the position of the installation area 40, and the electrode wire 50 is adhered to the piezoelectric part 10 and connected to the first electrode 20.
[0039] By setting a mounting area 40 on the side of the main body to form a lead space between the shell of the ultrasonic transducer and the piezoelectric component 10, the electrode wire 50 can be connected to the first electrode 20 without setting an electrode flange. The connection position of the electrode wire 50 will not occupy the area covered by the electrode, effectively avoiding the performance degradation of the ultrasonic transducer.
[0040] Specifically, the piezoelectric element 10 is made of a piezoelectric crystal material, including but not limited to quartz crystal and ceramic crystal. The piezoelectric element 10 is disc-shaped, with the upper and lower disc surfaces of the piezoelectric element 10 being electrode-covered surfaces, and the lateral surfaces of the piezoelectric element 10 being non-electrode-covered surfaces. The piezoelectric element 10 is the core component of the ultrasonic transducer. When a voltage is applied to the piezoelectric element 10, it deforms and generates mechanical vibrations, thereby generating ultrasonic waves that propagate into the surrounding medium. In other embodiments, the piezoelectric element 10 is not limited to a circular shape and may also have any other shape.
[0041] Among them, the first electrode 20 is the emitting surface electrode of the ultrasonic transducer, and the first electrode 20 is the negative electrode; the main body also includes a second electrode 30 with opposite polarity to the first electrode 20, and the first electrode 20 and the second electrode 30 are both adhered to the electrode covering surface, and the first electrode 20 and the second electrode 30 are respectively arranged on both sides of the piezoelectric component 10.
[0042] See also Figure 2 , the mounting area 40 is a mounting plane or a mounting notch; the mounting area 40 is located on the peripheral side of the body and extends in a direction perpendicular to the disk surface of the piezoelectric element 10. In this embodiment, the mounting area 40 is a mounting plane, and the mounting plane is polished. In other embodiments, the mounting area 40 can also be a mounting inclined surface, or a mounting notch of any shape, such as a notch with a semicircular cross-section. By providing a mounting plane or a mounting notch on the side of the ultrasonic transducer body, the area of the electrode coverage of the piezoelectric element 10 can be ensured as much as possible, and the electrode lead can be completed on the side.
[0043] See also Figure 3 The electrode wire 50 includes a conductive wire 51 and an insulating layer 52. The conductive wire 51 is used to transmit signals, and the insulating layer 52 is coated on the outside of the conductive wire 51 to protect the conductive wire 51. The conductive wire 51 is made of copper, and the insulating layer 52 is made of polyethylene or polyvinyl chloride. The copper conductive wire 51 has good conductivity and corrosion resistance. The insulating layer 52 is provided on the outside of the conductive wire 51, which effectively isolates the conductive wire 51 from contact with external media, preventing accidental current loss and short circuits, ensuring the normal operation of the ultrasonic transducer.
[0044] In this embodiment, the electrode wire 50 is partially attached to the mounting area 40, and the end of the conductive wire 51 has an exposed section extending from the insulating layer 52. The end of the exposed section is connected to the first electrode 20. Preferably, the end of the exposed section of the electrode wire 50 is flush with the surface of the first electrode 20 facing away from the piezoelectric element 10. By partially attaching the electrode wire 50 to the mounting area 40, the end of the exposed section can extend to the position of the first electrode 20 and connect with the first electrode 20. By arranging the end of the exposed section to be flush with the first electrode 20, it is convenient to connect the exposed section and the first electrode 20.
[0045] In this embodiment, quick-drying adhesive is used to adhere the electrode wire 50 to the mounting area 40 at the location where the electrode wire 50 is attached to the mounting area 40, thereby fixing the electrode wire 50 to the mounting area 40 and playing an auxiliary role. For example, polyurethane quick-drying adhesive and cyanoacrylate adhesive are used.
[0046] In this embodiment, the electrode wire 50 is connected to the first electrode 20 using electrode printing technology. Specifically, a conductive layer is provided at the connection between the electrode wire 50 and the first electrode 20. The conductive layer is located on the mounting area 40, and the electrode wire 50 is connected to the first electrode 20 through the conductive layer; the conductive layer is formed by curing a conductive silver paste material.
[0047] By setting a conductive layer between the electrode line 50 and the first electrode 20, the conductive silver paste is similar to electrode printing, replacing the traditional welding lead method. The conductive silver paste can fix and connect the first electrode 20 and the conductive wire 51 of the electrode line 50; compared with making electrode flanging, setting the conductive layer increases the conductive area, so that the effective working area of the ultrasonic transducer is increased, compared with making electrode flanging, the manufacturing cost of the device is reduced, and the manufacturing process steps are also reduced; and not making electrode flanging can basically ensure that the outer surface working areas of the first electrode 20 and the second electrode 30 of the ultrasonic transducer are equal and unchanged, thereby avoiding the reduction of device performance.
[0048] The following are the specific lead steps for the ultrasonic transducer:
[0049] like Figures 1 to 4 As shown, first, a mounting plane (i.e., mounting area 40) is formed by grinding the side surface of the piezoelectric component body to create a lead space between the ultrasonic transducer housing and the piezoelectric element 10. In this embodiment, the side surface of the body is a cylindrical surface; the grinding removal amount is approximately 0.2 mm.
[0050] Then, one end of the electrode wire 50 is attached to the installation area 40, and the end of the conductive wire 51 of the electrode wire 50 is kept flush with the surface of the first electrode 20 facing away from the piezoelectric component 10 (i.e., the emitting surface of the ultrasonic transducer); and the electrode wire 50 is quickly bonded and fixed to the installation area 40 using quick-drying glue.
[0051] Next, use a scraper to apply an appropriate amount of conductive silver paste to the intersection of the mounting surface and the conductive wire 51. The thinner the application, the better. You can control the application of different thicknesses of conductive silver paste at different locations based on actual needs. It is important to note that the conductive silver paste must be applied between the mounting surface and the conductive wire 51, as well as at the ends of the conductive wire 51. The application area of the conductive silver paste should be as small as possible to ensure reliable conduction between the first electrode 20 and the electrode wire 50.
[0052] Finally, the body and the electrode wire 50 are placed together in a high-temperature box for curing to obtain a conductive layer with a thickness of 30 to 70 microns. The electrode wire 50 is electrically connected to the first electrode 20 through the conductive layer.
[0053] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.
Claims
1. A piezoelectric component, characterized in that include: A body comprising a piezoelectric element (10) and a first electrode (20), wherein the piezoelectric element (10) has an electrode covering surface, the first electrode (20) is arranged on the electrode covering surface, and a mounting area (40) is provided on a side surface of the body; An electrode wire (50) is provided at the location of the installation area (40), and the electrode wire (50) is adhered to the piezoelectric element (10) and communicated with the first electrode (20).
2. The piezoelectric component according to claim 1, wherein: The installation area (40) is an installation plane or an installation notch.
3. The piezoelectric component according to claim 1, wherein: The electrode wire (50) is partially attached to the installation area (40), and the end of the electrode wire (50) is connected to the first electrode (20).
4. The piezoelectric component according to claim 3, wherein: The end of the electrode wire (50) is flush with the surface of the first electrode (20) facing away from the piezoelectric element (10).
5. The piezoelectric component according to claim 1, wherein: A conductive layer is provided at the connection between the electrode wire (50) and the first electrode (20), the conductive layer being located on the installation area (40), and the electrode wire (50) is connected to the first electrode (20) through the conductive layer.
6. The piezoelectric component according to claim 5, characterized in that The conductive layer is formed by curing a conductive silver paste material.
7. The piezoelectric component according to claim 1, wherein: The piezoelectric component (10) is disk-shaped, the disk surface of the piezoelectric component (10) is the electrode covering surface, and the mounting area (40) is arranged on the peripheral side surface of the body and extends in a direction perpendicular to the disk surface.
8. The piezoelectric component according to any one of claims 1 to 7, characterized in that: The electrode wire (50) comprises: Conductive wire (51), used for transmitting signals; An insulating layer (52) is coated on the outside of the conductive wire (51) and is used to protect the conductive wire (51).
9. The piezoelectric component according to any one of claims 1 to 7, characterized in that: The piezoelectric element (10) is made of piezoelectric crystal material.
10. Ultrasonic transducer, characterized in that The piezoelectric component comprises the piezoelectric component according to any one of claims 1 to 9.