Ultrasonic probe and recording shielding device using same

Abstract

The utility model discloses an ultrasonic probe and a recording shielding device using the same, belongs to the technical field of ultrasonic shielding, and solves the problem that the conventional piezoelectric ceramic is easy to fall off. An ultrasonic probe comprises a base, a connecting piece and an ultrasonic radiation piece, and the ultrasonic radiation piece is connected with a driving signal through the base. The ultrasonic radiation piece is arranged on the base through the connecting piece, and the connecting piece is located in a displacement node area of the ultrasonic radiation piece. The amplitude of the displacement node area of the ultrasonic radiation part is smaller than the amplitude of other areas of the ultrasonic radiation part. According to the ultrasonic probe, the ultrasonic radiation piece is fixed on the base through the connecting piece, and the connecting piece is positioned in the displacement node area of the ultrasonic radiation piece, so that the ultrasonic radiation piece can be prevented from falling off due to overlarge amplitude of the ultrasonic radiation piece when the ultrasonic probe works.

Description

Technical Field

[0001] The utility model belongs to the technical field of ultrasonic shielding, and in particular relates to an ultrasonic probe and a recording shielding device using the ultrasonic probe. Background Art

[0002] Existing ultrasonic probes are typically used for distance measurement. However, when applied to recording shielding, prolonged high-power output can cause the piezoelectric ceramics in the probe to vibrate excessively, easily leading to their shedding. Therefore, improvements to the process of ultrasonic probes used in ultrasonic recording shielding are a pressing issue for researchers in this field. Utility Model Content

[0003] The purpose of the utility model is to provide an ultrasonic probe and a recording shielding device using the same, which solves the problem that the existing piezoelectric ceramics are easy to fall off.

[0004] In order to achieve the above-mentioned purpose, the technical solution of an embodiment of the present utility model is implemented as follows: an ultrasonic probe includes a base, a connecting piece, and an ultrasonic radiating piece, and the ultrasonic radiating piece is connected to a driving signal through the base; the ultrasonic radiating piece is arranged on the base through the connecting piece, and the connecting piece is located in the displacement node area of ​​the ultrasonic radiating piece; the amplitude of the displacement node area of ​​the ultrasonic radiating piece is smaller than the amplitude of other areas of the ultrasonic radiating piece.

[0005] In some embodiments, the ultrasound probe further comprises a first electrical connector;

[0006] A first welding point is provided on the surface of the ultrasonic radiating element facing the base in the displacement node area; and the first welding point is electrically connected to the first electrical connector.

[0007] In some embodiments, the connecting member covers the first welding point.

[0008] In some embodiments, the ultrasonic radiator includes a piezoelectric ceramic sheet, and the piezoelectric ceramic sheet is disposed on the base through the connecting member; the first surface of the piezoelectric ceramic sheet facing the base is plated with a silver layer, and the first welding point is disposed on the silver layer.

[0009] In some embodiments, the ultrasonic radiator further includes a metal sheet, and the metal sheet is disposed on the second surface of the piezoelectric ceramic sheet.

[0010] In some embodiments, the metal sheet is provided with a through hole, and the second surface of the piezoelectric ceramic sheet is provided with a second welding point;

[0011] The ultrasonic probe further includes a second electrical connector, which passes through the through hole and is electrically connected to the second welding point.

[0012] In some embodiments, the second solder joint is located in the displacement node region.

[0013] In some embodiments, a connecting portion is provided on the through hole.

[0014] In some embodiments, the distance between the first welding point and the central axis of the piezoelectric ceramic piece is 0.67-0.7 times the diameter of the piezoelectric ceramic piece.

[0015] Another technical solution of the present invention is achieved as follows: a recording shielding device uses an ultrasonic probe.

[0016] Compared to the prior art, the present invention secures the ultrasonic radiator to the base via a connector located in the displacement node region of the ultrasonic radiator. Because the amplitude of the ultrasonic radiator in the displacement node region is smaller than that in other regions of the ultrasonic radiator, this prevents the ultrasonic radiator from falling off due to excessive vibration during operation of the ultrasonic probe. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of an ultrasonic probe provided in Example 1 of the present utility model;

[0018] Figure 2 A cross-sectional view of the ultrasonic probe provided in Example 1 of the present utility model;

[0019] Figure 3 This is an exploded schematic diagram of the ultrasonic probe provided in Example 1 of the present utility model;

[0020] Figure 4 This is a schematic exploded view from another angle of the ultrasonic probe provided in Example 1 of the present utility model;

[0021] Figure 5 This is a schematic diagram of the displacement vector of the ultrasonic probe vibration provided in Example 1 of the present utility model.

[0022] In the figure, 1. base, 11. notch, 2. connector, 21. protrusion, 3. ultrasonic radiator, 31. first welding point, 32. piezoelectric ceramic sheet, 321. second welding point, 33. metal sheet, 4. first electrical connector, 5. second electrical connector, 6. acoustic phase balancer, 7. lead pin, 8. connecting part. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] In the description of the present invention, it should be clarified that the terms "vertical", "transverse", "longitudinal", "front", "rear", "left", "right", "up", "down", "horizontal", etc. indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not mean that the devices or components referred to must have a specific orientation or position. Therefore, they cannot be understood as limitations on the present invention. In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] Example 1

[0026] The utility model provides an ultrasonic probe according to embodiment 1, such as Figure 1 As shown, the ultrasonic radiator 3 includes a base 1, a connector 2, and an ultrasonic radiator 3. The ultrasonic radiator 3 receives a driving signal through the base 1. The ultrasonic radiator 3 is mounted on the base 1 via the connector 2, and the connector 2 is located in the displacement node region of the ultrasonic radiator 3. The amplitude of the displacement node region of the ultrasonic radiator 3 is smaller than the amplitude of other regions of the ultrasonic radiator 3.

[0027] The base 1 may, for example, be provided with relevant electrical connectors to connect and transmit the driving signal to the ultrasonic radiator 3. The ultrasonic radiator 3 generates ultrasonic waves by vibrating after receiving the driving signal. The displacement node area is located in the inner circle of the ultrasonic radiator 3, and the displacement node area is roughly a circular area. The diameter of the displacement node area is 0.67-0.7 times the diameter of the ultrasonic radiator 3. Since the amplitude of the displacement node area of ​​the ultrasonic radiator 3 is the smallest, the connector 2 is provided in the displacement node area of ​​the ultrasonic radiator 3 in this embodiment. In this way, in the process of the ultrasonic probe generating ultrasonic waves, the connector 2 is less affected by the vibration, that is, the connection position between the ultrasonic radiator 3 and the base 1 is less affected by the vibration, so that the ultrasonic radiator 3 can be firmly fixed to the base 1 through the connector 2 to avoid the ultrasonic radiator 3 from falling off due to excessive amplitude when the ultrasonic probe is working.

[0028] In the specific implementation process of this embodiment 1, as Figure 2 As shown, the ultrasonic probe further includes a first electrical connector 4 .

[0029] A first welding point 31 is provided on the surface of the ultrasonic radiating element 3 facing the base 1 at a displacement node area. The first welding point 31 is electrically connected to the first electrical connector 4 .

[0030] More specifically, the first solder joint 31 is electrically connected to a lead pin 7 via the first electrical connector 4 . The lead pin 7 can transmit the driving signal to the ultrasonic radiator 3 via the first electrical connector 4 .

[0031] In the specific implementation of this embodiment 1, the connector 2 covers the first weld 31. The connector 2 covers the first weld 31, thereby preventing the first weld 31 from falling off during the ultrasonic generation process. The covering here can be provided by providing a space on the connector 2 to accommodate the first weld 31, or the connector 2 can have a certain degree of elasticity so that when contacting the first weld 31, the first weld 31 enters the connector 2, thereby allowing the connector 2 to wrap around the first weld 31 and prevent the first weld 31 from falling off.

[0032] More specifically, the ultrasonic probe includes two lead pins 7. One end of one lead pin 7 is connected to the positive electrode of the ultrasonic radiator 3, and the other end passes through the base 1 and is led out of the base 1 to be electrically connected to the drive circuit. The other end of the lead pin 7 is connected to the negative electrode of the ultrasonic radiator 3, and the other end passes through the base 1 and is led out of the base 1 to be electrically connected to the drive circuit. Lead pin 7 is used to receive a drive signal and transmit the drive signal to the ultrasonic radiator 3, causing the ultrasonic radiator 3 to vibrate. Lead pin 7 is, for example, a metal copper or steel needle.

[0033] like Figure 2 、 Figure 3 As shown, the surface of the ultrasonic radiator 3 facing the base 1 is provided with a first weld point 31 in the displacement node area. The connector 2 is sandwiched between the ultrasonic radiator 3 and the base 1. The connector 2 may be provided with a protrusion 21. The base 1 is provided with a notch 11 that cooperates with the protrusion 21. The protrusion 21 and the notch 11 cooperate to form a receiving space. The first weld point 31 is located within the receiving space formed by the protrusion 21 and the notch 11. One end of the first electrical connector 4 is inserted into the receiving space and welded to the bottom surface of the ultrasonic radiator 3 via the first weld point 31. The other end of the first electrical connector 4 is connected to a lead pin 7. The connector 2 covers the first weld point 31, thereby preventing the first weld point 31 from falling off when the ultrasonic radiator 3 vibrates.

[0034] Furthermore, the connector 2 can be made of other materials such as a silicone ring, a sealing ring, or the connector 2 itself can be made of a material with adhesive properties. The connector 2 and the base 1 are fixed by bonding or fixing.

[0035] Furthermore, the first electrical connection member 4 may be a wire for connecting to the first welding point 31 .

[0036] In the specific implementation process of this embodiment 1, as Figure 3 As shown, the ultrasonic radiator 3 includes a piezoelectric ceramic piece 32, and the piezoelectric ceramic piece 32 is disposed on the base 1 through the connector 2. The first surface of the piezoelectric ceramic piece 32 facing the base 1 is plated with a silver layer, and the first solder joint 31 is disposed on the silver layer.

[0037] Among them, the first surface of the piezoelectric ceramic piece 32 facing the base 1 is plated with a silver layer, and the first solder joint 31 is provided on the silver layer. Since the silver layer is easily oxidized, which can easily cause the first solder joint 31 to fall off, in this embodiment, the first solder joint 31 is covered with a connector 2 to isolate the silver layer from the air, thereby preventing the silver layer from oxidizing and further enhancing the stability of the first solder joint 31.

[0038] Among them, one end of the first electrical connector 4 is inserted into the accommodating space and welded to the bottom surface of the piezoelectric ceramic piece 32 through the first welding point 31, and the other end of the first electrical connector 4 is connected to a lead pin 7 (for example, equivalent to a lead pin 7 being connected to the positive pole of the piezoelectric ceramic piece 32).

[0039] Further, such as Figure 2 As shown, the distance between the first welding point 31 and the central axis A of the piezoelectric ceramic piece 32 is 0.67-0.7 times the diameter of the piezoelectric ceramic piece 32. This position is located in the displacement node area, that is, the first welding point 31 is located in the displacement node area. Figure 5 As shown in the figure, when the ultrasonic probe vibrates, the displacement vector schematic curves (B, C) of the piezoelectric ceramic piece 32 vibrating in the Z direction (i.e., along the direction of gravity) are shown in the figure. It can be seen that the vibration amplitude of the position where the connecting member 2 is located (i.e., the displacement node area) is the smallest compared with other areas. Therefore, the connecting member 2 can firmly fix the piezoelectric ceramic piece 32 on the base 1.

[0040] In the specific implementation process of this embodiment 1, as Figures 1 to 4 As shown, the ultrasonic radiator 3 further includes a metal sheet 33 , and the metal sheet 33 is disposed on the second surface of the piezoelectric ceramic sheet 32 ​​.

[0041] More specifically, the second surface of the piezoelectric ceramic sheet 32, i.e., the side of the metal sheet 33 facing away from the base 1, is bonded together to form a double laminate. The piezoelectric effect drives the entire double laminate into bending vibration, thereby radiating ultrasonic waves. Because the bending vibration of the metal sheet 33 has a low radiation impedance, it improves acoustic matching with air. The piezoelectric ceramic sheet 32 ​​and the metal sheet 33 can be secured by adhesive.

[0042] Furthermore, the metal sheet 33 is an aluminum sheet. In other embodiments, other light metals such as magnesium or titanium may also be used. The diameter of the metal sheet 33 is 1.28-1.35 times the diameter of the piezoelectric ceramic sheet 32. The thickness of the piezoelectric ceramic sheet 32 ​​may be 0.2-0.3 mm.

[0043] If only the piezoelectric ceramic sheet 32 ​​and the metal sheet 33 are used to form a double laminate, that is, only the double laminate is used to radiate ultrasonic waves, since the double laminate is in bending vibration during resonance operation, there is a "reverse zone" that reduces the radiation efficiency. This embodiment can further add an acoustic phase balancer 6 to adjust the sound radiation phase, thereby improving the sound emission efficiency. Specifically, if Figure 1 、 Figure 2 As shown, the acoustic phase balancer 6 abuts against the upper surface of the metal sheet 33 and is used to adjust the radiation phase of the ultrasonic wave. The acoustic phase balancer 6 is, for example, bowl-shaped and its material is, for example, metal. By adding the acoustic phase balancer 6 to adjust the sound radiation phase, the sound emission efficiency can be improved. If the acoustic phase balancer 6 is bowl-shaped, the opening angle (i.e., the angle between the two sides of the longitudinal section (such as 6b and 6c)) is between 145° and 160°, and the diameter of its maximum opening (i.e., the end 6a with a relatively larger opening diameter) is 0.67-0.72 times the diameter of the metal sheet 33, and the wall thickness is 0.1-0.15 mm.

[0044] Furthermore, the base 1 can be made of high-temperature resistant plastic or metal. The high-temperature resistance of the base 1 prevents the piezoelectric ceramic piece 32 from being overheated during long-term operation, thereby causing damage to the base 1 .

[0045] In the specific implementation process of this embodiment 1, as Figures 2 to 4 As shown, the metal sheet 33 is provided with a through hole (not shown in the figure), and the second surface of the piezoelectric ceramic sheet 32 ​​is provided with a second welding point 321.

[0046] The ultrasonic probe further includes a second electrical connector 5 , which is electrically connected to the second soldering point 321 through the through hole. The second soldering point 321 can also be arranged in the displacement node area.

[0047] In the specific implementation process of this embodiment 1, a connecting portion 8 is provided on the through hole.

[0048] More specifically, a through hole is provided on the metal sheet 33 for setting a connecting portion 8. The connecting portion 8 can be an adhesive or other component that serves to fix the connection. A second welding point 321 corresponding to the connecting portion 8 is provided on the piezoelectric ceramic sheet 32. One end of the second electrical connector 5 is connected to another lead pin 7, and the other end of the second electrical connector 5 passes through the through hole on the metal sheet 33 and is electrically connected to the second surface of the piezoelectric ceramic sheet 32 ​​via the second welding point 321 (for example, it is equivalent to another lead pin 7 being connected to the negative electrode of the piezoelectric ceramic sheet 32). Among them, the metal sheet 33 can also serve as a negative electrode, but because the metal sheet 33 is an aluminum sheet that is difficult to weld, while the piezoelectric ceramic sheet 32 ​​can be welded, in this embodiment, the second electrical connector 5 is welded to the piezoelectric ceramic sheet 32 ​​through the through hole on the metal sheet 33.

[0049] The first electrical connector 4 , the second electrical connector 5 , and the lead pin 7 are electrical connectors provided in the base 1 .

[0050] The adhesive can be super elastic silicone, thermosetting resin, thermoplastic resin or rubber.

[0051] Furthermore, the second electrical connection member 5 may be a wire for connecting to the second welding point 321 .

[0052] In the specific implementation process of this embodiment 1, as Figure 3 and Figure 4 As shown, the second welding point 321 is located in the displacement node area.

[0053] More specifically, the first solder joint 31 and the second solder joint 321 can both be located within the displacement node region, with no specific spacing required between them. The first surface of the piezoelectric ceramic 32 facing the base 1 is plated with a silver layer, and the first solder joint 31 is located on the silver layer. The second surface of the piezoelectric ceramic 32, i.e., the side of the piezoelectric ceramic 32 facing away from the base 1, is provided with the second solder joint 321. If both the first solder joint 31 and the second solder joint 321 are located within the displacement node region, the welds at these two locations can be more secure, further improving the reliability of the ultrasonic probe.

[0054] The ultrasonic probe of Example 1 can also be used in other detection fields to improve ultrasonic detection distance and sensitivity.

[0055] The workflow provided by Example 1 of the present invention is as follows: Pin 7 transmits a drive signal to piezoelectric ceramic disc 32. Subsequently, because the metal sheet 33 and piezoelectric ceramic disc 32 are bonded together to form a double-laminated disc, the piezoelectric effect can be used to drive the entire double-laminated disc to undergo a bending vibration to radiate ultrasonic waves. Simultaneously, the acoustic phase balancer 6 can adjust the ultrasonic radiation phase, thereby overcoming the problem of reduced radiation efficiency due to the "reverse zone." Furthermore, the first surface of the piezoelectric ceramic disc 32 facing the base 1 is plated with a silver layer, and a first solder joint 31 is provided on the silver layer. Because the silver layer easily oxidizes, which can cause the first solder joint 31 to fall off, the connector 2 is used to cover the first solder joint 31. This not only prevents the silver layer from oxidizing but also prevents the first solder joint 31 from falling off when the ultrasonic radiating element 3 vibrates. Similarly, the second solder joint 321 is also located within the displacement node region, which also ensures the secure welding of the second solder joint 321.

[0056] Example 2

[0057] This embodiment provides a recording jammer, using the ultrasonic probe of embodiment 1.

[0058] The ultrasonic probe is used to radiate ultrasonic waves. When the recording jammer uses the ultrasonic probe of Example 1, the ultrasonic radiation element 3 is firm and will not fall off when the ultrasonic probe is working, which greatly improves the service life of the ultrasonic probe and further improves the performance of the recording jammer.

[0059] To sum up, the embodiment of the utility model fixes the ultrasonic radiator 3 on the base 1 through the connecting member 2, and the connecting member 2 is in the displacement node area, which can prevent the ultrasonic radiator 3 from falling off due to excessive amplitude of the ultrasonic radiator 3 when the ultrasonic probe is working.

[0060] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An ultrasonic probe, characterized in that: The ultrasonic radiator (3) comprises a base (1), a connecting member (2), and an ultrasonic radiator (3), wherein the ultrasonic radiator (3) receives a driving signal through the base (1); the ultrasonic radiator (3) is arranged on the base (1) through the connecting member (2), and the connecting member (2) is located in a displacement node area of ​​the ultrasonic radiator (3); and the amplitude of the displacement node area of ​​the ultrasonic radiator (3) is smaller than the amplitude of other areas of the ultrasonic radiator (3).

2. The ultrasonic probe according to claim 1, wherein The ultrasonic probe further includes a first electrical connector (4); A first welding point (31) is provided on the surface of the ultrasonic radiation element (3) facing the base (1) in the displacement node area; the first welding point (31) is electrically connected to the first electrical connector (4).

3. The ultrasonic probe according to claim 2, wherein: The connecting member (2) covers the first welding point (31).

4. The ultrasonic probe according to claim 3, wherein: The ultrasonic radiating element (3) includes a piezoelectric ceramic piece (32), and the piezoelectric ceramic piece (32) is arranged on the base (1) through the connecting piece (2); the first surface of the piezoelectric ceramic piece (32) facing the base (1) is plated with a silver layer, and the first welding point (31) is arranged on the silver layer.

5. The ultrasonic probe according to claim 4, characterized in that The ultrasonic radiation element (3) further includes a metal sheet (33), and the metal sheet (33) is arranged on the second surface of the piezoelectric ceramic sheet (32).

6. The ultrasonic probe according to claim 5, characterized in that The metal sheet (33) is provided with a through hole, and the second surface of the piezoelectric ceramic sheet (32) is provided with a second welding point (321); The ultrasonic probe further comprises a second electrical connector (5), wherein the second electrical connector (5) passes through the through hole and is electrically connected to the second welding point (321).

7. The ultrasonic probe according to claim 6, characterized in that The second welding point (321) is located in the displacement node area.

8. The ultrasonic probe according to claim 7, wherein: A connecting portion (8) is provided on the through hole.

9. The ultrasonic probe according to any one of claims 4 to 8, characterized in that: The distance between the first welding point (31) and the central axis of the piezoelectric ceramic piece (32) is 0.67-0.7 times the diameter of the piezoelectric ceramic piece (32).

10. A recording jammer, characterized in that: Use the ultrasonic probe as described in any one of claims 1 to 9.

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