CN117335919A - Ultrasonic probe and recording shielding device using same - Google Patents

Abstract

The invention discloses an ultrasonic probe and a recording shielding device using the same, and belongs to the technical field of recording shielding. The ultrasonic probe includes: an ultrasonic wave transmitting assembly having a transmitting end for transmitting ultrasonic waves. The waveguide, the one end and the ultrasonic wave transmission subassembly of waveguide are connected, and are equipped with the reflection chamber that runs through in the waveguide, and the first end of reflection chamber is towards the transmitting end, and the second end of reflection chamber is open end. The area of the first end of the reflecting cavity of the waveguide is smaller than that of the second end of the reflecting cavity, namely the acoustic impedance of the reflecting cavity can be changed from the first end to the second end, so that the acoustic impedance of the plane where the second end of the reflecting cavity is located is matched with the acoustic impedance of air, and the electroacoustic conversion efficiency of ultrasonic waves can be improved. In addition, the ultrasonic probe can flatten ultrasonic waves, so that the directivity of the emitted ultrasonic waves is more concentrated and sharp than that of the traditional ultrasonic waves, the diffusion attenuation of the ultrasonic waves is reduced, and the probability that the ultrasonic waves enter human ears is further reduced.

Description

Ultrasonic probe and recording shielding device using same

Technical Field

The invention belongs to the technical field of recording shielding, and particularly relates to an ultrasonic probe and a recording shielding device using the same.

Background

Conventional ultrasonic probes generally use piezoelectric ceramic elements to generate ultrasonic waves, but the electroacoustic conversion efficiency and power of ultrasonic waves radiated into air by the piezoelectric ceramic elements are low due to the fact that the acoustic impedance of the surfaces of the piezoelectric ceramic elements is not matched with that of air. In addition, the ultrasonic sound-proof recording device utilizes the ultrasonic probe to emit ultrasonic waves, and when an interference signal is emitted, most of the interference signal can enter human ears and generate uncomfortable and harsh sounds, so that the user experience is poor.

Disclosure of Invention

The invention aims to provide an ultrasonic probe and a recording shielding device using the same, which not only can improve electroacoustic conversion efficiency of the probe, but also can reduce the probability of interference signals entering human ears.

In order to achieve the above purpose, the technical scheme of the invention is realized as follows: an ultrasonic probe, comprising:

an ultrasonic wave transmitting assembly having a transmitting end for transmitting ultrasonic waves;

the ultrasonic probe comprises a waveguide, an ultrasonic wave transmitting assembly, a reflecting cavity, a first end and a second end, wherein one end of the waveguide is connected with the ultrasonic wave transmitting assembly, a penetrating reflecting cavity is arranged in the waveguide, the first end of the reflecting cavity faces the transmitting end, the second end of the reflecting cavity is an open end, the area of the first end of the reflecting cavity is smaller than that of the second end of the reflecting cavity, and ultrasonic waves are transmitted to the outside of the ultrasonic probe from the second end of the reflecting cavity; the end face of the second end of the reflecting cavity is provided with a first side edge and a third side edge which are opposite, a second side edge and a fourth side edge which are opposite, and the distance between the first side edge and the third side edge is smaller than the distance between the second side edge and the fourth side edge.

In some embodiments, the reflective cavity includes a compression section and an expansion section; the first end of the compression section is the first end of the reflecting cavity, the second end of the compression section is communicated with the first end of the expansion section, and the second end of the expansion section is the second end of the reflecting cavity;

the connecting end of the expansion section and the compression section is the end with the smallest cross section area in the reflecting cavity.

In some embodiments, the reflective cavity is a first curve along two opposite sides of a longitudinal section cut parallel to the first side.

In some embodiments, the reflective cavity has a second curve along two opposite sides of a longitudinal section cut parallel to the second side, and the first curve has a shape different from the second curve.

In some embodiments, the first end of the reflective cavity is circular in cross-section and/or the second end of the reflective cavity is rectangular in cross-section.

In some embodiments, the height between the connection end and the first end of the reflective cavity is between 1/4 and 1/2 of the height of the reflective cavity.

In some embodiments, the cross section of the connecting end is 8mm-12mm long and 3mm-7mm wide;

and/or the number of the groups of groups,

the second end of the reflecting cavity has an end face length of 20mm-35mm and a width of 12mm-15mm.

In some embodiments, the ultrasonic wave transmitting assembly comprises a shell, a base, a piezoelectric ceramic piece and a metal sheet, wherein a containing cavity is arranged in the shell, the base is arranged at the bottom side of the containing cavity, the piezoelectric ceramic piece is arranged on the base, and the metal sheet is abutted against the upper surface of the piezoelectric ceramic piece; one end of the waveguide is abutted with the shell;

the ultrasonic wave transmitting assembly further comprises two lead pins, one end of each lead pin is connected with the positive electrode of the piezoelectric ceramic piece, and the other end of each lead pin penetrates through the base and the shell and is led out from the shell;

one end of the other lead pin is connected with the negative electrode of the piezoelectric ceramic piece, and the other end of the lead pin penetrates through the base and the shell and is led out from the shell.

In some embodiments, the height of the waveguide is 3-4cm.

In some embodiments, the waveguide material is plastic or metal.

The other technical scheme of the invention is realized as follows: a sound recording shielding device is applied to the ultrasonic probe.

Compared with the prior art, by adopting the ultrasonic probe provided by the embodiment of the invention, the waveguide is added on the ultrasonic wave transmitting assembly, and the area of the first end of the reflecting cavity of the waveguide is smaller than that of the second end of the reflecting cavity, namely the acoustic impedance of the reflecting cavity can be changed from the first end to the second end, so that the acoustic impedance of the transmitting end of the ultrasonic probe (namely the second end of the reflecting cavity of the waveguide) is closer to that of air only by designing the waveguide into a proper size, and the electroacoustic conversion efficiency of ultrasonic waves can be improved. In addition, on the terminal surface of the second end of reflection chamber, because the distance between first side and the third side is less than the distance between second side and the fourth side, the width of the terminal surface of the second end of reflection chamber promptly is narrower to can realize flattening the purpose to the ultrasonic wave, also make the directionality of ultrasonic wave of transmission more concentrated sharp than traditional simultaneously, reduce the diffusion decay of ultrasonic wave, further reduce the ultrasonic wave and enter into the probability of people's ear.

Drawings

Fig. 1 is a front view showing the structure of an ultrasonic probe according to embodiment 1 of the present invention;

fig. 2 is a plan view of an ultrasonic probe provided in embodiment 1 of the present invention;

fig. 3 is a schematic view of an ultrasonic probe according to embodiment 1 of the present invention;

fig. 4 is a side view of an ultrasonic probe provided in embodiment 1 of the present invention;

fig. 5 is a cross-sectional view of an ultrasonic probe provided in embodiment 1 of the present invention;

fig. 6 is another view cross-sectional view of the ultrasonic probe provided in embodiment 1 of the present invention;

FIG. 7 is a schematic cross-sectional view of an ultrasonic emission module according to embodiment 1 of the present invention;

fig. 8 is a polar ultrasonic directivity diagram of an ultrasonic probe provided in embodiment 1 of the present invention;

fig. 9 is a two-dimensional coordinate ultrasonic directivity diagram of the ultrasonic probe provided in embodiment 1 of the present invention;

FIG. 10 is a simulated directional balloon diagram of a conventional piezoelectric ceramic ultrasonic probe;

fig. 11 is a simulated directional balloon diagram of an ultrasonic probe according to embodiment 1 of the present invention.

In the figure, 1, ultrasonic wave emitting assembly, 11, housing, 111, receiving cavity, 12, base, 121, bottom, 122, support, 1221, recess, 13, piezoceramic tile, 14, sheet metal, 15, pin, 16, acoustic phase balancer, 2, waveguide, 21, reflective cavity, 21c, first curve, 21d, second curve, 211, compression section, 212, expansion section, 213, connection.

Detailed Description

The present invention will be described in further detail with reference to specific embodiments in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

In the description of the present invention, it should be clearly understood that terms such as "vertical", "horizontal", "longitudinal", "front", "rear", "left", "right", "upper", "lower", "horizontal", and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience of describing the present invention, and do not mean that the apparatus or element referred to must have a specific orientation or position, and thus should not be construed as limiting the present invention. In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Example 1

The ultrasonic probe provided in embodiment 1 of the present invention, as shown in fig. 1 to 6, includes:

the ultrasonic wave transmitting unit 1 has a transmitting end for transmitting ultrasonic waves.

The waveguide 2, one end of the waveguide 2 is connected with the ultrasonic wave transmitting assembly 1, and a reflective cavity 21 is arranged in the waveguide 2, a first end 21a of the reflective cavity 21 faces the transmitting end, a second end 21b of the reflective cavity 21 is an open end, the area of the first end 21a of the reflective cavity 21 is smaller than that of the second end 21b of the reflective cavity 21, and ultrasonic waves are transmitted from the second end 21b of the reflective cavity 21 to the outside of the ultrasonic probe. The end surface of the second end 21b of the reflective cavity 21 has opposite first and third sides 212a and 212c, and opposite second and fourth sides 212b and 212d, and the distance between the first and third sides 212a and 212c is smaller than the distance between the second and fourth sides 212b and 212 d.

The ultrasonic wave emitting unit 1 is driven by, for example, piezoelectric ceramics to generate ultrasonic waves, and the ultrasonic waves are emitted from the emitting end of the ultrasonic wave emitting unit 1. The waveguide 2 can realize acoustic impedance matching, and the ultrasonic wave can be reflected in the reflecting cavity 21. The first end 21a of the reflective cavity 21 faces the transmitting end of the ultrasonic wave transmitting assembly 1, and thus the ultrasonic wave transmitted by the transmitting end of the ultrasonic wave transmitting assembly 1 will enter the reflective cavity 21 from the first end 21a of the reflective cavity 21. Specifically, the end of the waveguide 2 for connecting the ultrasonic wave emitting assembly 1 and the first end 21a of the reflecting cavity 21 may be the same end, for example, the bottom end, that is, the bottom end of the waveguide 2 may be connected to the ultrasonic wave emitting assembly 1, and the bottom end of the reflecting cavity 21 faces the emitting end of the ultrasonic wave emitting assembly 1. The second end 21b of the reflecting cavity 21 is an open end, wherein the open end is an opening, so that the ultrasonic waves in the reflecting cavity 21 can be emitted from the open end.

The area of the first end 21a of the reflective cavity 21 is smaller than the area of the second end 21b of the reflective cavity 21, and since both the first end 21a and the second end 21b of the reflective cavity 21 are open, the opening of the reflective cavity 21 facing the ultrasonic wave emitting assembly 1 is smaller, and the opening of the reflective cavity 21 facing the outside of the ultrasonic probe is larger. In addition, regarding the second end 21b of the reflective cavity 21, the distance between the first side 212a and the third side 212c is smaller than the distance between the second side 212b and the fourth side 212d, which corresponds to the second end 21b having a narrower opening, similar to being in a "flattened" state. As shown in fig. 2, the second end 21b is rectangular in shape, for example. It is understood that the shape of the second end 21b is not limited to a rectangle, but may be other shapes, such as an ellipse, a parallelogram, a trapezoid, a polygon, an irregular shape, etc., as long as it has at least four sides as described above, and the interval between two opposite sides is different from the interval between two opposite sides.

In this embodiment, the waveguide 2 is added on the basis of the ultrasonic wave emitting assembly 1, that is, the ultrasonic wave emitted by the ultrasonic wave emitting assembly 1 is not directly emitted to the outside, but enters the reflecting cavity 21 of the waveguide 2 first, and after being reflected in the reflecting cavity 21 for several times, is emitted from the second end 21b of the reflecting cavity 21. Since the waveguide 2 has a certain length, and the area of the first end 21a is smaller than that of the second end 21b, that is, the cross-sectional dimension of the waveguide 2 may be changed (for example, may be changed from small to large), by designing the dimension of the waveguide 2, a transitional change of acoustic impedance may be achieved, so that the acoustic impedance of the first end 21a of the reflection cavity 21 may be close to that of the transmitting end of the ultrasonic wave transmitting assembly 1 (that is, the difference between the acoustic impedances of the two is smaller than the set threshold). And the acoustic impedance of the second end 21b of the reflecting cavity 21 is made to be close to that of air (i.e., the difference between the acoustic impedances of the two is smaller than another set threshold), so that the energy reflected at the boundary of the two media is reduced, and the electroacoustic conversion efficiency of ultrasonic waves is improved.

More specifically, since the opening of the second end 21b of the reflecting cavity 21 of the waveguide 2 is narrower, the ultrasonic waves entering the reflecting cavity 21 can be flattened by the waveguide 2, and finally the ultrasonic waves with narrower beams are emitted from the waveguide 2, so that the probability of the ultrasonic waves entering the human ear can be reduced, and if the ultrasonic probe is applied to recording shielding, a non-inductive anti-recording effect can be produced.

Therefore, by adopting the above scheme provided in this embodiment, the ultrasonic wave transmitting assembly 1 transmits ultrasonic waves, after the ultrasonic waves enter the waveguide 2, the reflective cavity 21 not only improves the transmitting sensitivity and electroacoustic conversion efficiency of the ultrasonic probe, but also limits the diffusion range of the ultrasonic waves when the ultrasonic waves propagate inside the waveguide 2, and when the ultrasonic waves propagate inside, the ultrasonic waves are continuously reflected through the reflective cavity 21 and after the sound velocity in the reflective cavity 21 is converted and flattened, the phase of the ultrasonic waves at the second end 21b surface of the reflective cavity 21 has a focusing effect, so that the wave beam is more concentrated, and meanwhile, the directivity of the transmitted ultrasonic waves is more concentrated and sharp than that of the conventional ultrasonic waves.

In a specific implementation of embodiment 1, as shown in fig. 3 and 6, the reflective cavity 21 includes a compression section 211 and an expansion section 212. The first end of the compression section 211 is the first end 21a of the reflective cavity 21, and the second end of the compression section 211 is in communication with the first end of the expansion section 212, and the second end of the expansion section 212 is the second end 21b of the reflective cavity 21. The connecting end 213 of the expansion section 212 and the compression section 211 is the end with the smallest cross-sectional area in the reflective cavity 21.

In this embodiment, after the ultrasonic wave emitted by the ultrasonic wave emitting component 1 enters the reflecting cavity 21, the ultrasonic wave passes through the compression section 211 and then passes through the expansion section 212, that is, the cross section of the reflecting cavity 21 is contracted and then expanded from the first end 21a to the second end 21b, so as to compress air, increase acoustic load and realize impedance matching. Wherein the compressed section 211 has, for example, a smaller cross-sectional area from its first end to its second end. The expansion section 212, for example, has a larger cross-sectional area from its first end to its second end. Thus, the cross-sectional area of the connecting end 213 of the compression section 211 and the expansion section 212 is minimized. Among the advantages of waveguide 2 having a connection end 213 are: since the area where the connection terminal 213 is located is the narrowest, the air pressure is large, so that the acoustic load can be increased, and the impedance matching of the entire waveguide 2 can be easily achieved.

In this embodiment 1, the cross-sectional shape of the first end 21a of the reflection cavity 21 may be adapted to the shape of the transmitting end of the ultrasonic wave transmitting assembly 1, for example, if the ultrasonic wave transmitting assembly 1 is a piezoelectric ceramic ultrasonic probe, the cross-section of the first end 21a of the reflection cavity 21 may be circular. The second end 21b of the reflective cavity 21 is rectangular in cross-section. In other embodiments, the cross-section of the first end 21a of the reflective cavity 21 may be rectangular, elliptical or otherwise shaped, depending on the type of ultrasound emitting assembly 1.

In a specific implementation of embodiment 1, as shown in fig. 5, two opposite sides of the longitudinal section of the reflective cavity 21 cut parallel to the first side 212a are first curves 21c.

In a specific implementation of embodiment 1, as shown in fig. 6, two opposite sides of the longitudinal section of the reflective cavity 21 cut parallel to the second side 212b are second curves 21d, and the shape of the first curve 21c is different from the shape of the second curve 21d.

More specifically, the shape of the first curve 21c and the second curve 21d is determined by the shape of the cross-section of the second end 21b of the reflective cavity 21, and the shape of the first curve 21c and the second curve 21d is different because the cross-section of the second end 21b of the reflective cavity 21 may be rectangular, elliptical, parallelogram or trapezoid or the like conforming to a pattern having a pitch on opposite sides different from that on other opposite sides.

Wherein the two first curves 21c for example constitute a hyperbolic-like shape. The two second curves 21d for example form a hyperbolic-like shape. Thus, the entire waveguide 2 is constituted by four curved surfaces recessed inward. The connection end 213 corresponds to the region having the shortest distance between the two first curves 21c and the region having the shortest distance between the two second curves 21d. In the whole, the first curve 21c may be bent outward to a greater extent than the second curve 21d, so that the width between the two first curves 21c is greater than the width between the two second curves 21d, i.e. the waveguide 2 is in a "flattened" shape as a whole, as shown in fig. 4, so as to have a flattening effect on the ultrasonic waves.

In the specific implementation process of embodiment 1, as shown in fig. 1-5, the cross section of the first end 21a of the reflective cavity 21 is, for example, circular, and the cross section starts from the first end 21a to enter the compression section 211, and gradually decreases according to the trend of the lower half of the first curve 21c and the second curve 21d until reaching the connection end 213, and then enters the expansion section 212, and gradually increases according to the trend of the upper half of the first curve 21c and the second curve 21d until reaching the second end 21b of the reflective cavity 21, and the cross section of the second end 21b of the reflective cavity 21 is rectangular. In the specific implementation of embodiment 1, the height between the connection end 213 and the first end 21a of the reflective cavity 21 is between 1/4 and 1/2 of the height of the reflective cavity 21. Wherein the connection end 213 may be located relatively lower in the reflective cavity 21.

In the embodiment of example 1, the cross section of the connecting end 213 is 8mm to 12mm long and 3mm to 7mm wide.

In the specific implementation of embodiment 1, the second end 21b of the reflective cavity 21 has an end surface with a length of 20mm to 35mm and a width of 12mm to 15mm.

More specifically, the connection end 213 in embodiment 1 is a height of the reflective cavity 21 1/3 of the height of the first end 21a toward the second end 21b. The cross section of the connecting end 213 is for example 10mm long and 5mm wide.

More specifically, the diameter of the first end 21a of the reflective cavity 21 is 15mm. The second end 21b of the reflective cavity 21 is rectangular in shape, for example, and the end face of the second end 21b is 20-35mm long and 12-15mm wide. If the ultrasonic wave transmitting assembly 1 is a piezoelectric ceramic ultrasonic wave probe, and the diameter of the piezoelectric ceramic ultrasonic wave probe shell is 16mm, when the first end 21a and the second end 21b of the reflecting cavity 21 are in the above size range, the acoustic impedance of the first end 21a is relatively close to that of the transmitting end (i.e. the resonant vibration surface) of the piezoelectric ceramic ultrasonic wave probe, and the acoustic impedance of the second end 21b is relatively close to that of air.

The longer the length of the second end 21b of the reflective cavity 21, the easier it is to narrow the beam, but too large it will take up volume, so that a suitable size needs to be chosen, so that the length of the rectangle of the second end 21b is 20-35mm.

In a specific implementation process of embodiment 1, as shown in fig. 5, 6 and 7, the ultrasonic wave emitting assembly 1 includes a housing 11, a base 12, a piezoelectric ceramic plate 13 and a metal sheet 14, a receiving cavity 111 is provided in the housing 11, the base 12 is disposed at a bottom side of the receiving cavity 111, the piezoelectric ceramic plate 13 is disposed on the base 12, and the metal sheet 14 abuts against an upper surface of the piezoelectric ceramic plate 13. One end of the waveguide 2 abuts the housing 11.

More specifically, the piezoelectric ceramic sheet 13 and the metal sheet 14 are bonded to form a double-laminated sheet, and the piezoelectric effect is utilized to drive the whole double-laminated sheet to perform bending vibration so as to radiate ultrasonic waves. In which acoustic matching with air can be improved because the radiation resistance of bending vibration of the metal foil 14 is low.

Further, the housing 11 is in a barrel-shaped structure, in this embodiment, the bottom end of the housing 11 is provided with the base 12, the top end of the housing 11 is one end contacting with the waveguide 2, and the top end of the housing 11 is an opening, so that loss of ultrasonic waves can be reduced in the transmission process.

In a specific implementation process of this embodiment, as shown in fig. 5, the ultrasonic wave emitting assembly 1 further includes two lead pins 15, one end of one lead pin 15 is connected to the positive electrode of the piezoelectric ceramic plate 13, and the other end passes through the base 12 and the housing 11 and is led out from the housing 11.

One end of the other lead pin 15 is connected to the negative electrode of the piezoelectric ceramic plate 13, and the other end passes through the base 12 and the case 11 and is led out from the case 11.

The lead pins 15 are used for connecting driving signals and transmitting the driving signals to the piezoelectric ceramic plates 13 so that the piezoelectric ceramic plates 13 vibrate.

More specifically, the diameter of the metal sheet 14 is 1.28 to 1.35 times the diameter of the piezoelectric ceramic plate 13. The thickness of the piezoelectric ceramic sheet 13 is 0.2-0.3mm.

If only the piezoelectric ceramic sheet 13 and the metal sheet 14 are used to form a double laminate, and only the double laminate is used to radiate ultrasonic waves, the radiation efficiency is lowered because the double laminate is bending vibration at the time of resonance operation, and the existence of a "reverse region". Further, the present embodiment adjusts the acoustic radiation phase by adding an acoustic phase balancer 16, thereby improving acoustic emission efficiency. Specifically, the acoustic phase balancer 16 abuts on the upper surface of the metal sheet 14 for adjusting the radiation phase of the ultrasonic wave, and the first end 21a of the reflection cavity 21 faces the acoustic phase balancer 16.

Further, the acoustic phase balancer 16 is, for example, bowl-shaped, and its material is, for example, metal. Acoustic emission efficiency can be improved by adding an acoustic phase balancer 16 to adjust the acoustic radiation phase. As shown in fig. 7, the first end 21a of the reflective cavity 21 faces the end 16a of the acoustic phase balancer 16, which has a relatively large opening diameter. If the acoustic phase balancer 16 is bowl-shaped, the open angle (i.e., the angle between the two sides of the longitudinal section (e.g., 16b and 16 c)) is 145 ° -160 °, the largest opening (i.e., the end 16a with the relatively larger opening diameter) is 0.67-0.72 times the diameter of the foil 14, and the wall thickness is 0.1-0.15mm. The opening of the acoustic phase balancer 16 is directed towards the first end 21a of the reflective cavity 21, ensuring that the acoustic phase balancer 16 transmits the conditioned ultrasonic energy to the reflective cavity 21 at the fastest speed.

The metal sheet 14 is an aluminum sheet. In other embodiments, light metals such as magnesium or titanium may be used.

The lead pins 15 are metal copper pins or steel pins, wherein wires (such as copper wires) are not shown in fig. 5 and 6, and the two lead pins 15 can be connected with the positive electrode and the negative electrode of the piezoelectric ceramic plate 13 through the wires, respectively. In a specific implementation of embodiment 1, as shown in fig. 5 and 6, the base 12 includes a bottom 121 and a support portion 122 connected to the bottom 121. The piezoelectric ceramic piece 13 is disposed on the supporting portion 122, and the base 12 is disposed at the bottom side of the accommodating cavity 111. The bottom 121 is provided with two through holes for assembling the lead pins 15.

More specifically, the base 12 may be made of high temperature resistant plastic or metal, and the base 12 is high temperature resistant to prevent the piezoelectric ceramic plate 13 from being excessively scalded during long-time operation, thereby damaging the base 12. The support 122 is a cylindrical cavity with a diameter 0.7 times the diameter of the piezoelectric ceramic plate 13. The supporting portion 122 has a height of 1mm to 3mm, two through holes (not shown) for assembling the lead pins 15 are provided on the bottom 121, and a marking portion is provided on the periphery of the through hole corresponding to one of the lead pins 15 to distinguish the positive and negative electrodes of the piezoelectric ceramic sheet 13. The identification part can be an externally attached identification, can also be an identification made by a pen, can also be a step, and can also be used for distinguishing the anode and the cathode by other identifications.

Further, as shown in fig. 5, the upper end of the supporting portion 122 is provided with a groove 1221 for accommodating an adhesive.

More specifically, the upper end of the supporting portion 122 is further provided with a groove 1221, so that the piezoelectric ceramic piece 13 is conveniently adhered to the base 12 by using an adhesive, and the adhesive may be superelastic silica gel, thermosetting resin, thermoplastic resin, rubber or the like. By providing the grooves 1221, the piezoelectric ceramic sheet 13 is easily mounted with an adhesive.

In a specific implementation of this embodiment 1, the height of the waveguide 2 is 3-4cm, as shown in fig. 5.

More specifically, the height of the waveguide 2 can satisfy the constraint on the ultrasonic waves, and also facilitates the assembly with the ultrasonic probe at a later stage.

In a specific implementation of embodiment 1, as shown in fig. 5, the waveguide 2 is made of plastic or metal, for example, hard plastic or metal.

More specifically, the waveguide 2 is made of hard plastic or metal, and the inner wall is smooth, so that the ultrasonic wave emitted by the ultrasonic emission component 1 can be reflected, and the loss in the reflecting process is reduced.

Further, since the volume of the waveguide 2 is relatively small, as shown in fig. 4, particularly, the thickness of the whole is thinned, a compact arrangement can be achieved in the case where an array ultrasonic probe is required, so that the volume of the product can be reduced as a whole.

The ultrasonic probe of the embodiment 1 of the present invention was used for simulation test, and 3 different types of test results as shown in fig. 8 to 11 were obtained.

Fig. 8 is an ultrasonic directivity diagram in polar coordinates, where 0-360 ° is azimuth, 110-140 is sound pressure level, and unit dB. As can be seen from the figure, compared with the traditional piezoelectric ceramic ultrasonic probe, the sound pressure level of the ultrasonic probe provided by the embodiment of the invention is improved by 6dB, meanwhile, the directivity of ultrasonic waves is more concentrated and sharp than that of the traditional piezoelectric ceramic ultrasonic probe, and the width of a main lobe is smaller than that of the traditional scheme, so that the beam pressure is narrower.

Fig. 9 is an ultrasonic directivity diagram in a two-dimensional coordinate system, wherein the ordinate is the sound pressure level (in dB), and the abscissa is the azimuth angle, and it can be seen from the figure that, compared with the conventional piezoelectric ceramic ultrasonic probe, the sound pressure level of the ultrasonic probe provided by the embodiment of the invention is improved by 6dB, and the directivity of the ultrasonic wave is more concentrated. In addition, as can be seen from the figure, the width of the main lobe of the ultrasonic wave of the ultrasonic probe provided by the embodiment of the invention is smaller than that of the traditional scheme, so that the beam pressure is narrow.

As can be seen from fig. 10 and 11, compared with the simulation direction balloon pattern of the ultrasonic probe provided by the embodiment of the present invention, the simulation direction balloon pattern of the conventional piezoelectric ceramic ultrasonic probe has a significantly narrower thickness, thereby realizing the effect of beam flattening.

The workflow provided in embodiment 1 of the present invention is as follows: the lead pins 15 transmit driving signals to the piezoelectric ceramic plates 13, and then, as the metal sheets 14 are attached to the piezoelectric ceramic plates 13 to form a double-lamination, the piezoelectric effect can be utilized to drive the whole double-lamination to perform bending vibration to radiate ultrasonic waves, and meanwhile, the acoustic phase balancer 16 can adjust the radiation phase of the ultrasonic waves, so that the problem that the radiation efficiency is reduced due to a reverse region can be solved, and the problem that the acoustic impedance of the probe surface is not matched with the acoustic impedance of air still exists. Therefore, the waveguide 2 is added in this embodiment, the impedance of the resonant vibration surface of the ultrasonic transmitting assembly 1 is close to the first end 21a of the reflecting cavity 21, and the acoustic impedance of the reflecting cavity 21 is gradually transited and is close to the acoustic impedance of air at the second end 21b, so that the problem that the acoustic impedance of the traditional ultrasonic probe is not matched with that of the air is solved, and the electroacoustic conversion efficiency is improved. In addition, in this embodiment 1, since the waveguide 2 with the outer surface recessed inwards and being flat is added, the waveguide 2 can collapse the beam, so that the directivity of the ultrasonic wave is more concentrated, and the overall thickness of the ultrasonic probe is thinned, so that the array ultrasonic probe is closely arranged, and the volume of the product is reduced as a whole.

Example 2

This embodiment provides a sound recording mask to which the ultrasonic probe of embodiment 1 is applied.

The ultrasonic probe of embodiment 1 also has more concentrated ultrasonic directivity than the conventional open type ultrasonic probe, which helps to reduce the diffusion attenuation of ultrasonic waves. The ultrasonic probe provided in embodiment 1 is applied to a recording shielding device, so that the ultrasonic amplitude of the ultrasonic probe emitted to the air is improved, the acoustic nonlinearity of a near sound field of the ultrasonic probe is further improved, the recording shielding distance is greatly improved in recording shielding equipment based on an ultrasonic parametric array, and the recording shielding effect can be further improved. And the ultrasonic probe can flatten the wave beam, so that the directivity of ultrasonic waves is more concentrated, the whole thickness of the ultrasonic probe is thinned, and the array ultrasonic probe can be closely arranged on the recording shielding device, so that the volume of a product is reduced as a whole.

Furthermore, the ultrasonic probe of embodiment 1 can be used in other detection fields to increase the ultrasonic detection distance and sensitivity.

In summary, the ultrasonic emission component 1 provided in the embodiment of the present invention is used for emitting ultrasonic waves and adjusting the radiation phase of the ultrasonic waves, so that the radiation efficiency of the ultrasonic probe is improved, the emission sensitivity and electroacoustic conversion efficiency of the ultrasonic probe are improved by the reflection cavity 21 of the waveguide 2, and the purpose of flattening the ultrasonic waves is achieved, so that the directivity of the emitted ultrasonic waves is more concentrated and sharp than the traditional directivity, and the diffusion attenuation of the ultrasonic waves is reduced. When the ultrasonic probe is applied to a recording shielding device, the distance of the recording shielding can be increased, and the distance of the recording shielding can be increased.

The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (11)

1. An ultrasonic probe, comprising:

an ultrasonic wave emitting module (1) having an emitting end for emitting ultrasonic waves;

a waveguide (2), wherein one end of the waveguide (2) is connected with the ultrasonic wave transmitting assembly (1), a penetrating reflecting cavity (21) is arranged in the waveguide (2), a first end (21 a) of the reflecting cavity (21) faces the transmitting end, a second end (21 b) of the reflecting cavity (21) is an open end, the area of the first end (21 a) of the reflecting cavity (21) is smaller than that of the second end (21 b) of the reflecting cavity (21), and the ultrasonic wave is transmitted from the second end (21 b) of the reflecting cavity (21) to the outside of the ultrasonic probe; an end face of the second end (21 b) of the reflective cavity (21) has opposite first (212 a) and third (212 c) sides, and opposite second (212 b) and fourth (212 d) sides, and a distance between the first (212 a) and third (212 c) sides is smaller than a distance between the second (212 b) and fourth (212 d) sides.

2. The ultrasound probe of claim 1, wherein the reflective cavity (21) comprises a compression section (211) and an expansion section (212); the first end of the compression section (211) is a first end (21 a) of the reflecting cavity (21), and the second end of the compression section (211) is communicated with the first end of the expansion section (212), and the second end of the expansion section (212) is a second end (21 b) of the reflecting cavity (21);

the connecting end (213) of the expansion section (212) and the compression section (211) is the end with the smallest cross-sectional area in the reflecting cavity (21).

3. An ultrasound probe according to claim 1, wherein the reflecting cavity (21) is a first curve (21 c) along two opposite sides of a longitudinal section cut parallel to the first side (212 a).

4. An ultrasound probe according to claim 3, wherein the reflecting cavity (21) has a second curve (21 d) along two opposite sides of a longitudinal section cut parallel to the second side (212 b), and the shape of the first curve (21 c) is different from the shape of the second curve (21 d).

5. The ultrasound probe according to claim 1, wherein the cross section of the first end (21 a) of the reflective cavity (21) is circular and/or the cross section of the second end (21 b) of the reflective cavity (21) is rectangular.

6. The ultrasound probe of claim 2, wherein the height between the connection end (213) and the first end (21 a) of the reflective cavity (21) is between 1/4 and 1/2 of the height of the reflective cavity (21).

7. An ultrasound probe according to claim 2, characterized in that the length of the cross section of the connection end (213) is 8-12 mm and the width is 3-7 mm;

and/or the number of the groups of groups,

the end face of the second end (21 b) of the reflecting cavity (21) is 20-35mm long and 12-15mm wide.

8. The ultrasonic probe according to any one of claims 1 to 7, wherein the ultrasonic wave emitting assembly (1) comprises a housing (11), a base (12), a piezoelectric ceramic plate (13) and a metal sheet (14), a containing cavity (111) is arranged in the housing (11), the base (12) is arranged at the bottom side of the containing cavity (111), the piezoelectric ceramic plate (13) is arranged on the base (12), and the metal sheet (14) is abutted against the upper surface of the piezoelectric ceramic plate (13); one end of the waveguide (2) is abutted with the shell (11);

the ultrasonic emission assembly (1) further comprises two lead pins (15), one end of one lead pin (15) is connected with the positive electrode of the piezoelectric ceramic piece (13), and the other end of the lead pin penetrates through the base (12) and the shell (11) and is led out from the shell (11);

one end of the other lead pin (15) is connected with the negative electrode of the piezoelectric ceramic piece (13), and the other end of the other lead pin penetrates through the base (12) and the shell (11) and is led out from the shell (11).

9. An ultrasound probe according to claim 1, characterised in that the height of the waveguide (2) is 3-4cm.

10. An ultrasound probe according to claim 1, characterised in that the waveguide (2) is made of plastic or metal.

11. A sound recording shield, characterized in that an ultrasonic probe according to any one of claims 1-10 is applied.