CN107981887B - Ultrasonic transducer, focusing transducer and manufacturing method of focusing transducer - Google Patents
Ultrasonic transducer, focusing transducer and manufacturing method of focusing transducer Download PDFInfo
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- CN107981887B CN107981887B CN201711380040.3A CN201711380040A CN107981887B CN 107981887 B CN107981887 B CN 107981887B CN 201711380040 A CN201711380040 A CN 201711380040A CN 107981887 B CN107981887 B CN 107981887B
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- A61B8/44—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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Abstract
The invention provides an ultrasonic transducer, a focusing transducer and a manufacturing method of the focusing transducer, and relates to the technical field of ultrasonic detection. The ultrasonic transducer comprises a pipe sleeve, wherein at least two piezoelectric components are dispersedly arranged in the pipe sleeve, each piezoelectric component comprises a piezoelectric vibrator and a matching layer, the matching layers are positioned at the same end of the pipe sleeve, and the frequencies of the piezoelectric vibrators are not all the same; the focusing transducer comprises the ultrasonic transducer, and the matching layer forms a concave spherical surface in the pipe sleeve; the manufacturing method of the focusing transducer comprises the following steps: heating and softening the insulating filler; compressing the piezoelectric assembly by using a part with a convex spherical surface until the piezoelectric assembly is sunken in the insulating filler to form a concave spherical surface; the insulating filler is cooled and solidified, and the part having the convex spherical surface is taken out. The frequencies of the piezoelectric vibrators in the piezoelectric component are different, and the frequencies of the obtained corresponding ultrasonic waves are also different, so that the frequency bandwidth of the ultrasonic transducer for obtaining the ultrasonic waves is widened, the application range of the ultrasonic transducer is enlarged, and the practicability of the ultrasonic transducer is improved.
Description
Technical Field
The invention relates to the technical field of ultrasonic detection, in particular to an ultrasonic transducer, a focusing transducer and a manufacturing method of the focusing transducer.
Background
The medical ultrasonic imaging technology is one of the clinically important image diagnosis means at present, and utilizes ultrasonic waves as a carrier for detecting the interior of an organism, combines the technologies of digital signals, image processing, computers and the like, extracts effective echo signals in ultrasonic echoes, images tissues and organs, and probes physiological and diagnostic information of human bodies or animals.
In the ultrasonic detection process, the transmission and the reception of ultrasonic waves are realized by an ultrasonic transducer, a piezoelectric transducer is generally used in the ultrasonic detection, the piezoelectric transducer can be regarded as a three-port electromechanical equivalent circuit network, the core component of the piezoelectric transducer is a piezoelectric vibrator, two mechanical ports are arranged in front of and behind the piezoelectric vibrator, the piezoelectric vibrator is an electric port and is connected to an electronic system, the piezoelectric vibrator can generate resonance under the excitation of an electric signal, and the resonance frequency is the frequency of the converted ultrasonic waves; wherein, the resonance of the piezoelectric vibrator can be caused to generate ultrasonic only when the electric signal is near the resonance frequency, and when the frequency of the electric signal is equal to that of the piezoelectric vibrator, the efficiency of mutual conversion between the electric energy and the sound energy of the ultrasonic transducer is the highest.
The existing ultrasonic transducer can only receive electric signals with small-range frequency generally, the frequency bandwidth of ultrasonic waves obtained by corresponding conversion is narrow, and the frequency of the ultrasonic waves directly influences the penetrating power of the ultrasonic transducers, so that the application range of the ultrasonic transducers is small, and the practicability is poor.
Disclosure of Invention
The invention aims to provide an ultrasonic transducer, a focusing transducer and a manufacturing method of the focusing transducer, and aims to solve the technical problems that the ultrasonic transducer in the prior art is small in application range and poor in practicability due to the fact that the frequency band range of ultrasonic waves obtained from the ultrasonic transducer is small.
The ultrasonic transducer provided by the invention comprises a pipe sleeve, wherein at least two relatively independent piezoelectric components are dispersedly arranged in the pipe sleeve; the piezoelectric component comprises a piezoelectric vibrator and a matching layer, the matching layer is electrically connected with one electrode surface of the piezoelectric vibrator and is tightly attached to the electrode surface, and the matching layer and the other electrode surface of the piezoelectric vibrator are respectively used for being electrically connected with a positive electrode and a negative electrode of an electronic system; the matching layers of the piezoelectric components are located at the same end of the pipe sleeve, and the frequencies of the piezoelectric vibrators of the different piezoelectric components are not all the same.
Furthermore, the piezoelectric assembly further comprises a backing layer, the backing layer is electrically connected with the piezoelectric vibrator and tightly attached to the piezoelectric vibrator, the piezoelectric vibrator is located between the backing layer and the matching layer, and the backing layer is used for being electrically connected with the anode or the cathode of the electronic system.
Furthermore, the number of the piezoelectric assemblies is multiple, wherein the piezoelectric vibrators of at least two piezoelectric assemblies have the same frequency, and in the piezoelectric assemblies with the same frequency, the backing layers of at least two piezoelectric assemblies are electrically connected together through a conductive connecting plate, and the conductive connecting plate is used for being electrically connected with the positive electrode or the negative electrode of an electronic system; preferably, the piezoelectric assembly is provided with a plurality of rows, the frequency of each row of piezoelectric vibrators is different, the frequency of the piezoelectric vibrators in the same row is the same, and the backing layers in the same row are electrically connected together through a conductive connecting plate.
Further, in the piezoelectric vibrators of the piezoelectric assembly, the piezoelectric vibrators with different frequencies are made of different piezoelectric materials; or the piezoelectric material is made of the same material and different thicknesses.
Further, the pipe sleeve is a metal conductive pipe sleeve, the pipe sleeve is electrically connected with the matching layer, and the piezoelectric vibrator and the backing layer are arranged in an insulating mode with the pipe sleeve.
Furthermore, insulating supports are filled in gaps among the piezoelectric components.
Furthermore, one end of the pipe sleeve, which is internally provided with the back lining layer, is filled with insulating filler, and the piezoelectric assembly is embedded in the insulating filler.
It is another object of the invention to provide a focusing transducer comprising an ultrasonic transducer as claimed in claim 7, wherein the matching layer of the piezoelectric assembly forms a concave spherical surface within the sleeve.
Further, the insulating filler is softened by heating and is re-solidified when meeting cold; preferably, the insulating filler is epoxy resin.
The present invention also provides a method for manufacturing a focusing transducer, for manufacturing the focusing transducer as claimed in claim 9, the method comprising the steps of:
s100, heating and softening the insulating filler;
s200, pressing the piezoelectric assembly along the axial direction of the pipe sleeve by using a part with a convex spherical surface from one end of the pipe sleeve, which is provided with the matching layer, until the piezoelectric assembly is sunken in the insulating filler to form a concave spherical surface;
s300, cooling and solidifying the insulating filler, and taking out the part with the convex spherical surface from the pipe sleeve.
The ultrasonic transducer, the focusing transducer and the manufacturing method of the focusing transducer have the beneficial effects that:
the ultrasonic transducer comprises a pipe sleeve used as a carrier and a piezoelectric component used for realizing conversion between electric energy and mechanical energy, wherein a piezoelectric vibrator is used for converting an electric signal into an ultrasonic sound signal, and a matching layer is used for reducing acoustic impedance between the piezoelectric vibrator and a tested tissue so as to reduce useless reflection of ultrasonic waves during transmission between different media and improve the echo bandwidth of the ultrasonic waves at a target tissue; the focusing transducer comprises the ultrasonic transducer, a plurality of matching layers in the ultrasonic transducer form a concave spherical surface in the pipe sleeve, ultrasonic waves converted by the piezoelectric vibrators are vertically transmitted through the matching layers after passing through the matching layers and are focused at a certain distance, ultrasonic lobes are reduced, and the definition of ultrasonic imaging is improved. Specifically, the method for manufacturing the focusing transducer comprises the following steps: heating and softening the insulating filler in the pipe sleeve; starting from one end of the pipe sleeve provided with the matching layer by using a part with a convex spherical surface, pressing the piezoelectric components along the axial direction of the pipe sleeve until the piezoelectric components are sunken in the insulating filler to form a concave spherical surface; the insulating filler is cooled and solidified, and the piezoelectric assembly is fixed in the solidified insulating filler to form the focusing transducer.
The piezoelectric vibrator comprises two electrode surfaces, the matching layer is electrically connected with one electrode surface and is tightly attached to the electrode surface, when the piezoelectric vibrator is used, the matching layer in the piezoelectric assembly is electrically connected with the positive electrode (or the negative electrode) of an electronic system through a lead, the other electrode surface of the piezoelectric vibrator is electrically connected with the negative electrode (or the positive electrode) of the electronic system (the positive electrode surface is electrically connected with the positive electrode of the electronic system in the two electrode surfaces of the piezoelectric vibrator, and the negative electrode surface is electrically connected with the negative electrode of the electronic system), the electronic system outputs an electric signal with a frequency band corresponding to the piezoelectric vibrator, the electric signal is transmitted to the piezoelectric vibrator through the lead, the piezoelectric vibrator receives the electric signal and converts the electric signal into ultrasonic waves with corresponding frequencies, and the ultrasonic waves are transmitted outwards after passing; the frequency of the piezoelectric vibrators in the piezoelectric components is different, the frequency band of an electric signal transmitted by the electronic system to the piezoelectric vibrators with different frequencies is also different, the piezoelectric vibrators obtain corresponding ultrasonic frequencies which are also different, so that the ultrasonic transducer is widened to obtain the frequency bandwidth of ultrasonic waves, and the penetrating power of the ultrasonic frequencies is directly influenced, so that the detection of the ultrasonic transducer on tissues with different depths is improved, the application range of the ultrasonic transducer is enlarged, and the practicability of the ultrasonic transducer is improved.
The matching layers of a plurality of piezoelectric components in the focusing transducer form a concave spherical surface at one side of the pipe sleeve, ultrasonic waves converted by the piezoelectric components are emitted out of the matching layers and focused at the spherical center of the concave spherical surface, an ultrasonic lobe becomes narrow, the ultrasonic focus is positioned at the detected tissue, the resolution of the ultrasonic waves at the ultrasonic focus is improved by the imaging equipment, so that the definition of ultrasonic imaging is effectively improved, the range of the ultrasonic focus is small, and the ultrasonic focus can be concentrated on the pathological tissue to reduce the damage of normal tissues during treatment. Specifically, another ultrasonic transducer may be used to convert the ultrasonic waves and display the converted ultrasonic waves on the imaging device, so as to obtain an ultrasonic image of the detected tissue.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of a first three-dimensional structure of an ultrasonic transducer provided in an embodiment of the present invention, in which no insulating filling material is disposed between piezoelectric components;
fig. 2 is a schematic diagram of a second three-dimensional structure of an ultrasonic transducer provided in an embodiment of the present invention, wherein an insulating filling material is disposed between piezoelectric components;
FIG. 3 is a schematic three-dimensional structure of the piezoelectric assembly of FIG. 2;
FIG. 4 is another schematic three-dimensional structure of the piezoelectric assembly of FIG. 2, wherein the backing layers of each row are electrically connected by a conductive connection plate;
fig. 5 is a schematic three-dimensional structure diagram of the external shape of the focusing transducer provided by the embodiment of the invention.
Icon: 1-pipe sleeve; 2-a piezoelectric vibrator; 3-a matching layer; 4-backing layer; 5-an insulating support; 6-insulating filler; 7-concave spherical surface; 8-conductive connection board.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The present embodiment provides an ultrasonic transducer, as shown in fig. 1 and fig. 2, including a pipe sleeve 1, at least two relatively independent piezoelectric components are dispersed in the pipe sleeve 1; the piezoelectric component comprises a piezoelectric vibrator 2 and a matching layer 3, wherein the matching layer 3 is electrically connected with one electrode surface of the piezoelectric vibrator 2 and is tightly attached to the electrode surface, and the matching layer 3 and the other electrode surface of the piezoelectric vibrator 2 are respectively used for being electrically connected with a positive electrode and a negative electrode of an electronic system; the matching layer 3 of each piezoelectric component is positioned at the same end of the pipe sleeve 1, and the frequencies of the piezoelectric vibrators 2 of different piezoelectric components are not all the same.
The present embodiment also provides a focusing transducer, as shown in fig. 5, comprising the above-mentioned ultrasonic transducer, wherein the matching layer 3 of the piezoelectric component in the ultrasonic transducer forms a concave spherical surface 7 in the pipe sleeve 1
The present embodiment further provides a method for manufacturing a focusing transducer, which is used to manufacture the focusing transducer, and the manufacturing method includes the following steps:
s100, heating and softening the insulating filler 6;
s200, pressing the piezoelectric component along the axial direction of the pipe sleeve 1 by using a part with a convex spherical surface from one end of the pipe sleeve 1 provided with the matching layer 3 until the piezoelectric component is sunken in the insulating filler 6 to form a concave spherical surface 7;
s300, cooling and solidifying the insulating filler 6, and taking out the part with the convex spherical surface from the pipe sleeve 1.
The ultrasonic transducer, the focusing transducer and the manufacturing method of the focusing transducer provided by the embodiment are characterized in that the ultrasonic transducer comprises a pipe sleeve 1 used as a carrier and a piezoelectric component used for realizing conversion between electric energy and mechanical energy, wherein a piezoelectric vibrator 2 is used for converting an electric signal into an ultrasonic sound signal, and a matching layer 3 is used for reducing acoustic impedance between the piezoelectric vibrator 2 and a tested tissue so as to reduce useless reflection when ultrasonic waves are transmitted between different media and improve echo bandwidth of the ultrasonic waves at a target tissue; the focusing transducer comprises the ultrasonic transducer, a plurality of matching layers 3 in the ultrasonic transducer form a concave spherical surface 7 in the pipe sleeve 1, ultrasonic waves converted by the piezoelectric vibrators 2 are vertically emitted by the matching layers 3 after passing through the matching layers 3 and are focused at a certain distance, ultrasonic lobes are reduced, and the definition of ultrasonic imaging is improved. Specifically, the method for manufacturing the focusing transducer comprises the following steps: heating and softening the insulating filler 6 in the pipe sleeve 1; starting from the end, provided with the matching layer 3, of the pipe sleeve 1, pressing the piezoelectric components along the axial direction of the pipe sleeve 1 by using a component with a convex spherical surface until the piezoelectric components are sunken in the insulating filler 6 to form a concave spherical surface 7; the insulating filler 6 is cooled and solidified, and the piezoelectric assembly is fixed in the solidified insulating filler 6 to form the above-described focusing transducer.
The piezoelectric vibrator 2 comprises two electrode surfaces, the matching layer 3 is electrically connected with one of the electrode surfaces and is tightly attached, when in use, the matching layer 3 in the piezoelectric assembly is electrically connected with the anode (or the cathode) of an electronic system through a lead, the other electrode surface of the piezoelectric vibrator 2 is electrically connected with the cathode (or the anode) of the electronic system (the anode of the two electrode surfaces of the piezoelectric vibrator 2 is electrically connected with the anode of the electronic system, and the cathode of the electronic system is electrically connected with the cathode of the electronic system), the electronic system outputs an electric signal with a frequency band corresponding to that of the piezoelectric vibrator 2, the electric signal is transmitted to the piezoelectric vibrator 2 through the lead, the piezoelectric vibrator 2 receives the electric signal and converts the electric signal into ultrasonic wave with corresponding frequency, and the ultrasonic wave is transmitted outwards after passing through the matching layer 3 to detect a detected tissue; the frequency of the piezoelectric vibrators 2 in the piezoelectric components is different, the frequency band of an electric signal transmitted by the electronic system to the piezoelectric vibrators 2 with different frequencies is also different, the piezoelectric vibrators 2 obtain different frequencies of corresponding ultrasonic waves, so that the ultrasonic transducer is widened to obtain the frequency bandwidth of the ultrasonic waves, the penetrating power of the ultrasonic waves is directly influenced by the frequency of the ultrasonic waves, the detection of the ultrasonic transducer on tissues with different depths is improved, the application range of the ultrasonic transducer is enlarged, and the practicability of the ultrasonic transducer is improved.
The frequency of the piezoelectric vibrators 2 is affected by the piezoelectric material and the thickness, so the piezoelectric vibrators 2 with different frequencies in the ultrasonic transducer can be respectively selected from the piezoelectric vibrators 2 with the same material and different thicknesses, or the piezoelectric vibrators 2 with different materials and different thicknesses. Specifically, the piezoelectric material may be selected from piezoelectric ceramics, piezoelectric polymers or single crystals, and the like, wherein the piezoelectric polymers such as polyvinylidene fluoride (PVDF) and copolymer P (VDF-TrFE) have low acoustic impedance (about 4MRyl), are easily matched with biological tissues, and have wide frequency band; the piezoelectric ceramic PZT-5H has high electromechanical coupling coefficient (kt is 0.5), sensitivity and narrow frequency band, and is suitable for depth imaging of large tissues; the lithium niobate single crystal LiNbO3 has an electromechanical coupling coefficient (kt 0.5) close to that of PZT-5H, has a low dielectric constant and a relatively high sound velocity, is suitable for being used as a large-size high-frequency ultrasonic transducer, and can select a suitable piezoelectric material according to the application of the ultrasonic transducer in practical use.
Specifically, the cross section of the piezoelectric vibrator 2 may be square, circular, or other shapes.
The matching layer 3 of a plurality of piezoelectric components in the focusing transducer forms a concave spherical surface 7 at one side of the pipe sleeve 1, ultrasonic waves converted by the piezoelectric components are emitted out of the matching layer 3 and focused at the spherical center of the concave spherical surface 7, an ultrasonic lobe becomes narrow, the ultrasonic focus is positioned at a detected tissue, the resolution of the ultrasonic waves at the position is improved by the imaging equipment, so that the definition of ultrasonic imaging is effectively improved, the range of the ultrasonic focus is small, and the ultrasonic wave can be concentrated on a pathological tissue to reduce the damage of normal tissues during treatment. Specifically, another ultrasonic transducer may be used to convert the ultrasonic waves and display the converted ultrasonic waves on the imaging device, so as to obtain an ultrasonic image of the detected tissue.
In this embodiment, as shown in fig. 1, fig. 3 and fig. 4, the piezoelectric assembly may further include a backing layer 4, the backing layer 4 is electrically connected and tightly attached to the piezoelectric vibrator 2, the piezoelectric vibrator 2 is located between the backing layer 4 and the matching layer 3, and the backing layer 4 is used for electrically connecting with a positive electrode or a negative electrode of an electronic system. The electric signal of the electronic system is firstly transmitted to the backing layer 4, then reaches the piezoelectric vibrator 2, and the backing layer 4 is arranged to be used as the anode or the cathode of the piezoelectric component on one hand; on the other hand, the backing layer 4 is made of a conductive material, so that the oscillation of the ultrasonic waves converted by the piezoelectric vibrator 2 in the piezoelectric component can be reduced, and the normal emission of the ultrasonic waves is ensured. Specifically, the backing layer 4 and the matching layer 3 may be electrically connected to the piezoelectric vibrator 2 through a conductive adhesive.
In this embodiment, there may be a plurality of piezoelectric assemblies, wherein the piezoelectric vibrators 2 of at least two piezoelectric assemblies have the same frequency, and in the piezoelectric assemblies with the same frequency, the backing layers 4 of at least two piezoelectric assemblies are electrically connected together through a conductive connecting plate 8, and the conductive connecting plate 8 is used for electrically connecting with the positive electrode or the negative electrode of the electronic system; specifically, as shown in fig. 1 to 4, the piezoelectric assembly may have a plurality of rows, each row of piezoelectric vibrators 2 has a different frequency, the plurality of piezoelectric vibrators 2 in the same row have the same frequency, and the plurality of backing layers 4 in the same row are electrically connected together by a conductive connecting plate 8. In a plurality of piezoelectric assemblies, including the piezoelectric vibrators 2 with the same or different frequencies, wherein in the piezoelectric vibrators 2 with the same frequency, two, three or more backing layers 4 are electrically connected together through a conductive connecting plate 8, when in use, an electronic system applies an electric signal of one frequency band to the conductive connecting plate 8 through a cable, the conductive connecting plate 8 transmits the electric signal to the two or more backing layers electrically connected with the conductive connecting plate, the backing layers 4 then transmit the electric signal to the corresponding piezoelectric vibrators 2, the arrangement of the conductive connecting plate 8 can realize the control of a single core on the plurality of piezoelectric assemblies, and the structure and the operation are simpler on the basis of ensuring the normal operation of the ultrasonic transducer.
Specifically, the ultrasonic transducer may include one, two or more conductive connection plates 8, and the shape of the conductive connection plate 8 may be linear, curved, annular, or the like.
Specifically, the number of the piezoelectric assemblies may be 9, the 9 piezoelectric assemblies are arranged in a 3 × 3 array, and the three backing layers 4 in the same row are electrically connected together through the conductive connection board 8.
In addition to the above-described structure, the conductive connection plate 8 may not be provided, and each backing plate may be electrically connected to a power supply system that individually outputs an electric signal of a corresponding frequency band to each piezoelectric assembly.
In this embodiment, in the piezoelectric vibrators 2 of the piezoelectric assembly, the piezoelectric vibrators 2 of different frequencies may be made of different piezoelectric materials; or the piezoelectric material is made of the same material and different thicknesses. Among them, in order to reduce the difference in electrical impedance between piezoelectric components in the ultrasonic transducer, the piezoelectric vibrators 2 of different frequencies may be made of different piezoelectric materials.
Specifically, in this embodiment, the pipe sleeve 1 may be a metal conductive pipe sleeve, the pipe sleeve 1 is electrically connected to the matching layer 3, and the piezoelectric vibrator 2 and the backing layer 4 are both insulated from the pipe sleeve 1. When the matching layer is used, ultrasonic waves are emitted from one end of the matching layer 3, the anode or the cathode of power supply equipment is electrically connected with the metal conductive pipe sleeve, and the metal conductive pipe sleeve is electrically connected with the matching layer 3 through a wire, so that the electric connection of an electronic system and the matching layer 3 is realized, and the influence on the working condition of the 3 ends of the matching layer when the electronic system is directly electrically connected with the matching layer 3 through the wire or other conductive materials is reduced.
In order to improve the stability of the piezoelectric elements, in the present embodiment, as shown in fig. 2 to 4, an insulating support 5 may be filled in the gap between the piezoelectric elements. Insulating support 5 plays the support isolation effect to piezoelectric assembly, strengthens piezoelectric assembly's stability, ensures ultrasonic transducer's normal work, and insulating support 5 can realize the insulating nature between the piezoelectric assembly, reduces piezoelectric assembly and takes place to rock and contact each other, influences its normal behavior's emergence.
In order to further improve the fixation of the piezoelectric assembly, in this embodiment, as shown in fig. 1 and fig. 2, an insulating filler 6 may be filled at one end of the casing 1, where the backing layer 4 is disposed, and the piezoelectric assembly is embedded in the insulating filler 6; the insulating filler 6 is softened by heating and re-solidified upon cooling; preferably, the insulating filler 6 may be epoxy resin.
Initially, an insulating filler 6 in an ultrasonic transducer is in a solidified state, a piezoelectric component is embedded in the insulating filler 6, when the ultrasonic transducer is manufactured into a focusing transducer, the insulating filler 6 is heated and softened firstly, then a component with a convex spherical surface, such as a spherical metal ball, is used, the piezoelectric component is pressed inwards from a pipe sleeve 1 at one end of a matching layer 3, the matching layer 3 of the piezoelectric component is stressed to be sunken into the insulating filler 6 along the radial direction of the spherical surface perpendicular to the stress point, the metal ball is pressed downwards for a certain distance, the matching layers 3 of a plurality of piezoelectric components correspondingly form a concave spherical surface 7, after a period of time, the insulating filler 6 is cooled and solidified, the position of the piezoelectric component in the pipe sleeve 1 is fixed, the focusing transducer is formed, and the metal ball is taken out.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. An ultrasonic transducer is characterized by comprising a pipe sleeve (1), wherein a plurality of relatively independent piezoelectric components are dispersed in the pipe sleeve (1);
the piezoelectric assembly comprises a piezoelectric vibrator (2) and a matching layer (3), wherein the matching layer (3) is electrically connected with one electrode surface of the piezoelectric vibrator (2) and is tightly attached to the electrode surface;
the pipe sleeve (1) is a metal conductive pipe sleeve, the pipe sleeve (1) is electrically connected with the matching layer (3), and the pipe sleeve (1) is electrically connected with the anode or the cathode of an electronic system;
the piezoelectric component further comprises a backing layer (4), the backing layer (4) is electrically connected with the other electrode surface of the piezoelectric vibrator (2) and is tightly attached to the other electrode surface of the piezoelectric vibrator, the piezoelectric vibrator (2) is located between the backing layer (4) and the matching layer (3), and the backing layer (4) is used for being electrically connected with the positive electrode or the negative electrode of the electronic system;
one end of the pipe sleeve (1) in which the back lining layer (4) is arranged is filled with an insulating filler (6), and the piezoelectric component is embedded in the insulating filler (6);
the matching layers (3) of the piezoelectric components are positioned at the same end of the pipe sleeve (1), and the frequencies of the piezoelectric vibrators (2) of different piezoelectric components are not all the same;
among the plurality of relatively independent piezoelectric assemblies, the piezoelectric vibrators (2) of at least two piezoelectric assemblies have the same frequency, and among the piezoelectric assemblies with the same frequency, the backing layers (4) of at least two piezoelectric assemblies are electrically connected together through a conductive connecting plate (8), and the conductive connecting plate (8) is used for being electrically connected with the positive pole or the negative pole of an electronic system;
the piezoelectric vibrator (2) and the backing layer (4) are insulated from the pipe sleeve (1);
the matching layer (3) of the piezoelectric component forms a concave spherical surface (7) in the pipe sleeve (1).
2. The ultrasonic transducer according to claim 1, wherein said piezoelectric assembly is in a plurality of rows, each row of said piezoelectric vibrators (2) has a different frequency, a plurality of said piezoelectric vibrators (2) in the same row have the same frequency, and a plurality of said backing layers (4) in the same row are electrically connected together by a conductive connecting plate (8).
3. The ultrasonic transducer according to claim 1 or 2, wherein in the piezoelectric vibrators (2) of the piezoelectric assembly, the piezoelectric vibrators (2) of different frequencies are made of different piezoelectric materials;
or the piezoelectric material is made of the same material and different thicknesses.
4. Ultrasonic transducer according to claim 1 or 2, characterized in that the gaps between the piezoelectric elements are filled with an insulating support (5).
5. A focusing transducer, characterized in that it comprises an ultrasonic transducer according to any one of claims 1 to 4.
6. The focused transducer according to claim 5, characterized in that the insulating filler (6) is softened by heat and resolidified by cooling.
7. The focusing transducer according to claim 6, characterized in that the insulating filler (6) is epoxy.
8. A method of manufacturing a focusing transducer, for manufacturing a focusing transducer according to any one of claims 5-7, the method comprising the steps of:
s100, heating and softening the insulating filler (6);
s200, pressing the piezoelectric assembly along the axial direction of the pipe sleeve (1) by using a part with a convex spherical surface from one end, provided with the matching layer (3), of the pipe sleeve (1) until the piezoelectric assembly is sunken in the insulating filler (6) to form a concave spherical surface (7);
s300, cooling and solidifying the insulating filler (6), and taking out the part with the convex spherical surface from the pipe sleeve (1).
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| CN112638264B (en) * | 2018-06-12 | 2024-05-17 | 深圳市理邦精密仪器股份有限公司 | Ultrasonic transducer, ultrasonic probe, and ultrasonic detection device |
| CN109150011B (en) * | 2018-08-09 | 2019-11-05 | 南京邮电大学 | Three layers of cross-linked network square piezoelectric energy collector of ultrasonic action |
| CN109530196B (en) * | 2018-11-28 | 2023-10-27 | 深圳先进技术研究院 | Transducer assembly and method of making the same |
| WO2020107283A1 (en) * | 2018-11-28 | 2020-06-04 | 深圳先进技术研究院 | Transducer assembly, and manufacturing method for same |
| TWI740658B (en) * | 2020-09-22 | 2021-09-21 | 國立高雄科技大學 | Multi-frequency ultrasonic transducer input device and its manufacturing method |
| CN114129189B (en) * | 2021-11-30 | 2023-02-03 | 深圳先进技术研究院 | Dual-frequency intravascular ultrasonic transducer, and method and device for calculating Young modulus of vascular wall |
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Effective date of registration: 20200918 Address after: Baita Industrial Cluster, Baita Town, Xianju County, Taizhou City, Zhejiang Province Patentee after: Huiwei medical technology (Taizhou) Co.,Ltd. Address before: 1068 No. 518000 Guangdong city in Shenzhen Province, Nanshan District City Xili Road School of Shenzhen University Patentee before: SHENZHEN INSTITUTES OF ADVANCED TECHNOLOGY |