Horn unit, horn array device and sound generating device

Abstract

The present invention provides a horn unit, a horn array device and a sound generating device. The horn unit includes: a first and a second sound wave introduction tube and a sound wave superposition and export tube, which include a first and a second trapezoidal side surfaces arranged in parallel and a first and a second square side surfaces arranged oppositely, and each cross-section is a square that gradually becomes larger along the sound wave conduction direction; the small ends of the cross-sections of the first sound wave introduction tube and the second sound wave introduction tube are transitioned from a square to a circular sound outlet; the large end of the cross-section of the sound wave superposition and export tube is a square sound outlet; the large ends of the cross-sections of the first and second sound wave introduction tubes are connected to the small end of the cross-section of the sound wave superposition and export tube, and the first trapezoidal side surfaces of the first and second sound wave introduction tubes are adjacent to form a V-shaped groove, and the second trapezoidal side surfaces of the first and second sound wave introduction tubes are adjacent to the first and second square side surfaces of the sound wave superposition and export tube, so that after the sound waves are introduced into the respective sound wave introduction tubes from the respective circular sound outlets, they are superposed in the sound wave superposition and export tube and are transmitted out from the square sound outlet. Through the above solution, the sound pressure level and the directivity can be improved.

Description

Technical Field

[0001] The present invention relates to the field of acoustic technologies, and in particular, to a horn unit, a horn array device, and a sound generating device. Background Art

[0002] In the prior art, the implementation of high sound pressure level acoustic wave devices is designed differently according to different acoustic index requirements. Each product has to undergo major changes and take a long time to complete, which is not only time-consuming and laborious but also costly. Often, after a product is designed, if new indicators are required, new designs have to be carried out. At the same time, due to the limitation of spatial flexibility, it is also very difficult to design a large integrated device to achieve high-performance and high sound pressure level acoustic devices. Moreover, it is difficult to uniformly maintain and upgrade each device with different indicators, and the sustainability performance improvement between them is very poor. High-performance acoustic devices are receiving increasing attention in today's security, but it is difficult to break through the technical bottleneck. The sound pressure level has reached its peak and it is very difficult to increase it, resulting in the delay of large-scale application of sound energy devices.

[0003] Therefore, in the prior art, improving the sound pressure level is a problem to be solved. Summary of the Invention

[0004] In view of this, embodiments of the present invention provide a horn unit, a horn array device, and a sound generating device to solve the problem of improving the sound pressure level of a sound pressure device.

[0005] The technical solution of the present invention is as follows:

[0006] According to one aspect of an embodiment of the present invention, a horn unit is provided, including: a sound wave superposition and derivation tube and at least a pair of sound wave introduction tubes; each pair of sound wave introduction tubes includes a first sound wave introduction tube and a second sound wave introduction tube; the first sound wave introduction tube, the second sound wave introduction tube, and the sound wave superposition and derivation tube all include a first trapezoidal side and a second trapezoidal side arranged in parallel and a first square side and a second square side arranged oppositely, and the cross-sections of the three are all squares that gradually become larger in the sound wave conduction direction;

[0007] The smaller cross-sectional end of the first acoustic wave introduction tube is formed with a first circular sound-emitting opening by transitioning from a square cross-section; the smaller cross-sectional end of the second acoustic wave introduction tube is formed with a second circular sound-emitting opening by transitioning from a square cross-section; the larger cross-sectional end of the acoustic wave superposition and export tube is formed with a square sound outlet; the larger cross-sectional ends of the first acoustic wave introduction tube and the second acoustic wave introduction tube are both connected to the smaller cross-sectional end of the acoustic wave superposition and export tube, and the first trapezoidal side of the first acoustic wave introduction tube and the first trapezoidal side of the second acoustic wave introduction tube are adjacent to form a V-shaped groove, and the second trapezoidal side of the first acoustic wave introduction tube and the second trapezoidal side of the second acoustic wave introduction tube are respectively adjacent to the first square side and the second square side of the acoustic wave superposition and export tube, so that after two identical acoustic wave signals are respectively introduced into the first acoustic wave introduction tube from the first circular sound-emitting opening and into the second acoustic wave introduction tube from the second circular sound-emitting opening, they are superposed in the acoustic wave superposition and export tube and the superposed and enhanced acoustic wave signal is emitted from the square sound outlet.

[0008] In some embodiments, the included angle range of the V-shaped groove is 15 degrees to 20 degrees.

[0009] In some embodiments, the depth of the acoustic wave superposition and export tube is between one time and two times the wavelength of the incoming acoustic wave signal.

[0010] In some embodiments, the included angles of the V-shaped grooves corresponding to each pair of acoustic wave introduction tubes are equal, and the included angles between the extended lines of the two waists of the first trapezoidal side of the acoustic wave superposition and export tube and the included angles between the extended lines of the two waists of the second trapezoidal side are both equal to the included angle of the V-shaped groove corresponding to the acoustic wave introduction tube.

[0011] In some embodiments, the first acoustic wave introduction tube and the second acoustic wave introduction tube of each pair of acoustic wave introduction tubes are symmetrically arranged, the specifications of each pair of acoustic wave introduction tubes are the same, and each pair of acoustic wave introduction tubes are arranged along the extending direction of their V-shaped grooves.

[0012] In some embodiments, the sum of the lengths of the adjacent sides of the second trapezoidal side of the first acoustic wave introduction tube of each pair of acoustic wave introduction tubes and the bottom side of the second square side of the acoustic wave superposition and export tube is equal to the length of the corresponding side of the second square side of the acoustic wave superposition and export tube.

[0013] In some embodiments, the larger cross-sectional end of the acoustic wave superposition and export tube forms a square sound outlet by simultaneously extending and expanding outward through its first square side and second square side and combining the cooperating extension parts of its first trapezoidal side and second trapezoidal side.

[0014] In some embodiments, at least one side of the square sound outlet of the acoustic wave superposition and export tube extends vertically outward to form an edge part, and the edge part is used to fix the horn unit to an external device.

[0015] According to another aspect of the embodiments of the present invention, a horn array device is provided, including: a plurality of horn units as described in any one of the above embodiments; the square sound outlet directions of the sound wave superposition and derivation tubes in each horn unit are the same and are flush-mounted.

[0016] According to another aspect of the embodiments of the present invention, a sound generating device is provided, including: a horn unit, a vibration unit, and a control unit as described in any one of the above embodiments; wherein, a vibration unit is installed at each first circular sound outlet and each second circular sound outlet of the horn unit; the control unit is configured to input a synchronous control signal to each vibration unit so that each vibration unit generates the same sound wave signal.

[0017] In some embodiments, the vibration unit includes a phase plug, a short horn, a piezoelectric ceramic diaphragm, a sound film, and a resonance sound generating cavity;

[0018] The phase plug includes a central axis portion and a plurality of fins; one end of the central axis portion of the phase plug is in the shape of a first cone, and the other end is in the shape of a second cone; the bottom of the first cone is completely aligned and connected to the bottom of the second cone, and the height of the first cone is greater than the height of the second cone; the top of the second cone is used for bonding the middle part of the sound film that can be taperedly matched with the second cone; the plurality of fins are erected on the side surface of the first cone, and the planes where each fin is located coincide with the axial section of the first cone; each fin includes a first side, a second side, and a third side, the first side of the fin is arranged along the side surface of the first cone, the second side of each fin extends along one side of the cross-section of the second cone, the contour formed by the second sides of all the fins is in the shape of the side surface of a frustum of a cone and is on the same conical surface as the side surface of the second cone, and the third sides of all the fins can extend and converge at a point to form a conical surface contour surrounding the side surface of the first cone; the included angle between the planes where two adjacent fins are located is a set angle;

[0019] The short horn includes a sound wave constraint portion and a peripheral portion; the sound wave constraint portion includes a contraction portion and a cylindrical portion, and the thinner end of the port of the contraction portion is connected to one end of the cylindrical portion to form a funnel shape; the inner peripheral surface of the contraction portion surrounds the outside of the third sides of all the fins of the phase plug to form a sound wave transmission channel between every two adjacent fins; the peripheral portion surrounds the outside of the sound wave constraint portion to cooperate with the resonance sound generating cavity to form a resonance sound generating cavity for accommodating the phase plug, the sound film, and the piezoelectric ceramic diaphragm; the top of the second cone of the phase plug bonds the middle part of one side of the sound film; the other side of the sound film bonds the middle part of the ceramic surface of one side of the piezoelectric ceramic diaphragm; the other end of the cylindrical portion is connected to the circular sound outlet of the horn unit to form a channel for superposing sound waves.

[0020] In some embodiments, the piezoelectric ceramic diaphragm includes: a circular metal sheet and a circular piezoelectric ceramic film bonded to one side surface of the metal sheet;

[0021] The diameter range of the piezoelectric ceramic film is from 26.55 mm to 37.55 mm, and the diameter range of the metal sheet is from 28 mm to 39 mm. Among them, the diameter of the piezoelectric ceramic film is smaller than that of the metal sheet; the thickness range of the piezoelectric ceramic film is from 285 μm to 315 μm, and the thickness range of the metal sheet is from 190 μm to 210 μm;

[0022] The piezoelectric ceramic film includes oxygen element, titanium element, zirconium element, lead element, strontium element and niobium element. Among them, the content range of strontium element is from 3.56% to 3.94%, and the content range of niobium element is from 5.38% to 5.95%.

[0023] In some embodiments, the phase plug includes: the angle range between the planes of two adjacent rib fins is from 12 degrees to 18 degrees; the taper range of the first cone is from 10 degrees to 16 degrees.

[0024] An acoustic unit, a horn array device and an acoustic device according to an embodiment of the present invention decompose high-performance acoustic efficiency devices into individual independent working modules, and array these modules. Through the array, various acoustic devices with high acoustic efficiency deterrence and high sound pressure level for different requirements can be flexibly realized. By using this acoustic device, the sound pressure level can be increased without limit.

[0025] The additional advantages, objectives and features of the present invention will be partially described below, and will become partially apparent to those of ordinary skill in the art after studying the following text, or can be learned from the practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained by the structures specifically pointed out in the written description, its claims and the drawings.

[0026] Those skilled in the art will understand that the objectives and advantages that can be achieved by the present invention are not limited to the above specifically described, and it will be more clearly understood from the following detailed description that the above and other objectives that the present invention can achieve. Description of the Drawings

[0027] The drawings described herein are used to provide a further understanding of the present invention, form a part of this application, and do not limit the present invention. The components in the drawings are not drawn to scale, but only to illustrate the principles of the present invention. In order to facilitate the illustration and description of some parts of the present invention, the corresponding parts in the drawings may be enlarged, that is, may become larger relative to other components in the exemplary device actually manufactured according to the present invention. In the drawings:

[0028] Figure 1 Structural schematic diagram of a horn unit according to an embodiment of the present invention;

[0029] Figure 2 Structural schematic diagram of a horn array device according to an embodiment of the present invention;

[0030] Figure 3 Schematic diagram of sound wave superposition;

[0031] Figure 4 Structural schematic diagram of a sound generating device according to an embodiment of the present invention;

[0032] Figure 5 Structural schematic diagram of a vibration unit according to an embodiment of the present invention;

[0033] Figure 6 Structural schematic diagram of a phase plug according to an embodiment of the present invention;

[0034] Figure 7 Structural schematic diagram of a resonance sound generating cavity according to an embodiment of the present invention;

[0035] Figure 8 Structural schematic diagram of the bottom of a short horn according to an embodiment of the present invention;

[0036] Figure 9 Frequency response curve of a sound generating device according to an embodiment of the present invention;

[0037] Figure 10 Structural schematic diagram of a cascaded sound generating device according to an embodiment of the present invention. Detailed implementation manners

[0038] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the implementation manners and the accompanying drawings. Herein, the illustrative implementation manners of the present invention and their descriptions are used to explain the present invention, but do not limit the present invention.

[0039] Herein, it also needs to be noted that in order to avoid obscuring the present invention due to unnecessary details, only the structures and / or processing steps closely related to the solution according to the present invention are shown in the drawings, while other details less related to the present invention are omitted.

[0040] It should be emphasized that the term "comprising / including" when used herein refers to the presence of features, elements, steps or components, but does not exclude the presence or addition of one or more other features, elements, steps or components.

[0041] Herein, it also needs to be noted that if not otherwise specified, the term "connection" in this article can not only refer to direct connection, but also represent indirect connection with an intermediate.

[0042] In the following, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same reference numerals represent the same or similar components, or the same or similar steps.

[0043] In acoustics, there are ways of sound convergence of multiple sound sources such as line sources, curve sources, and plane sources. The sound field radiated by a strong sound point source has a certain degree of divergence and does not have the characteristic of directivity. The curved array in the line source combination is particularly suitable for long-distance sound radiation and has excellent directivity in terms of coverage. For a conical radiator, when the frequency is relatively high and the distance difference is half of the wavelength, the sound waves will be out of phase and cancel each other out. The array sound source is the result of the superposition of sound waves radiated from different parts of multiple sound sources in the far field of a free field. Therefore, in the present application, by restricting the frequency band, amplitude, radiation, and reflection angle of the sound source, the point source radiation is made to be directionally transmitted.

[0044] Figure 1 It is a schematic structural diagram of a horn unit in an embodiment of the present invention. As Figure 1 shown, the horn unit includes a sound wave superposition and derivation tube 300 and at least a pair of sound wave introduction tubes; each pair of sound wave introduction tubes includes a first sound wave introduction tube 100 and a second sound wave introduction tube 200; the first sound wave introduction tube 100, the second sound wave introduction tube 200, and the sound wave superposition and derivation tube 300 each include a first trapezoidal side 100a and a second trapezoidal side 100b that are arranged in parallel and a first square side 100c and a second square side that are arranged opposite to each other; a first trapezoidal side 200a and a second trapezoidal side 200b of the second sound wave introduction tube and a first square side 200c and a second square side that are arranged opposite to each other; a first trapezoidal side 300a and a second trapezoidal side 300b of the sound wave superposition and derivation tube and a first square side 300c and a second square side that are arranged opposite to each other; and the cross-sections of all three of them are squares that gradually become larger in the sound wave conduction direction.

[0045] One end of the first acoustic wave introduction tube with a smaller cross-section transitions from a square cross-section to form a first circular sound-emitting opening 110; one end of the second acoustic wave introduction tube with a smaller cross-section transitions from a square cross-section to form a second circular sound-emitting opening; one end of the acoustic wave superposition and export tube with a larger cross-section forms a square sound outlet 310; the larger cross-section ends of the first acoustic wave introduction tube and the second acoustic wave introduction tube are both connected to the smaller cross-section end of the acoustic wave superposition and export tube, and the first trapezoidal side of the first acoustic wave introduction tube and the first trapezoidal side of the second acoustic wave introduction tube are adjacent to form a V-shaped groove 120. The second trapezoidal side 100b of the first acoustic wave introduction tube and the second trapezoidal side 200b of the second acoustic wave introduction tube are respectively adjacent to the first square side 300c and the second square side 300d of the acoustic wave superposition and export tube, so that two identical acoustic wave signals are respectively introduced into the first acoustic wave introduction tube from the first circular sound-emitting opening and into the second acoustic wave introduction tube from the second circular sound-emitting opening, and then are superimposed in the acoustic wave superposition and export tube and the superimposed and enhanced acoustic wave signal is transmitted out from the square sound outlet.

[0046] As Figure 1 shown, there can be multiple cases such as one pair, two pairs, or three pairs of acoustic wave introduction tubes. The first acoustic wave introduction tube, the second acoustic wave introduction tube, and the acoustic wave superposition and export tube all have their respective first trapezoidal sides, second trapezoidal sides, first square sides, and second square sides. And in each structure, the first trapezoidal side can be parallel to the second trapezoidal side, and the first square side can be opposite to the second square side. And the respective sides of the opposite first square side and second square side can be aligned. The trapezoid in each structure can be connected to the side of the square. The cross-section of the structure formed by connecting the first trapezoidal side, the second trapezoidal side, the first square side, and the second square side is rectangular, and the square cross-section gradually expands from the position of the acoustic wave introduction tube to the position where the acoustic wave is transmitted out from the acoustic wave export tube. And, this horn unit effectively concentrates the acoustic waves at the front part of the acoustic wave superposition and export tube, converges and bundles the acoustic waves, so that the sound can be concentrated and infinitely superimposed at the front part without canceling each other out.

[0047] In the horn unit, the first acoustic wave introduction tube uses the first circular sound-emitting opening to reduce the loss of acoustic waves during transmission. Similarly, the second acoustic wave introduction tube uses the second circular sound-emitting opening to reduce the loss of acoustic waves during transmission. By adjacent grooves on the sides of the first acoustic wave introduction tube and the second acoustic wave introduction tube, the sound is concentrated at one point according to the characteristics of the acoustic wave frequency, and the useless acoustic waves are filtered.

[0048] In some embodiments, the included angle range of the V-shaped groove is 15 degrees to 20 degrees.

[0049] Among them, the included angle of the V-shaped groove is the included angle formed by the connection of the first acoustic wave introduction tube and the second acoustic wave introduction tube at the acoustic wave superposition and export tube. The bottom of the V-shaped groove can also be of other shapes. For example, the bottom of the V-shaped groove can also be a bottom with a certain arc, presenting a V-shape with a curved bottom. The included angle of the V-shaped groove can be any angle within the included angle range such as 15 degrees, 16 degrees, 17 degrees, 18 degrees, 19 degrees, or 20 degrees. By setting the included angle of the V-shaped groove, the directivity of the horn component to the acoustic wave is improved, and further, the loss and attenuation of the acoustic wave during transmission are reduced. If the included angle of the V-shaped groove is too large, the acoustic waves introduced by the first acoustic wave introduction tube and the second acoustic wave introduction tube will cancel each other out. Therefore, setting the included angle of the V-shaped groove within the range of 15 degrees to 20 degrees results in a relatively high sound pressure level of the acoustic wave that can be heard by the human ear within the frequency range of 3.4 kHz to 3.8 kHz.

[0050] In some embodiments, the depth of the acoustic wave superposition and export tube is between one time and two times the wavelength of the incoming acoustic wave signal.

[0051] Among them, the depth of the acoustic wave superposition and export tube can be 1.1 times, 1.2 times, 1.3 times, 1.4 times, 1.5 times, 1.6 times, 1.7 times, 1.8 times, 1.9 times, or 2.0 times the wavelength of the incoming acoustic wave signal, etc. For example, the depth of the acoustic wave superposition and export tube can be 1.2 times. Different wavelengths of different frequency bands corresponding to different horn units will impose constraints on the sound. Therefore, for acoustic waves of different frequency bands, the length of the acoustic wave superposition and export tube can be set according to the different frequency bands of the acoustic wave. The length setting of the wavelength superposition and export tube can be between one time and two times the wavelength of the incoming acoustic wave signal. In addition to the case where there is a pair of acoustic wave introduction tubes, there is also a case where multiple pairs of acoustic wave introduction tubes are used as a module, and the multiple pairs of acoustic wave introduction tubes can be set to improve the transmission effect of the acoustic wave.

[0052] In some embodiments, the included angles of the V-shaped grooves corresponding to each pair of acoustic wave introduction tubes are equal, and the included angles formed by the extensions of the two waists of the first trapezoidal side and the second trapezoidal side of the acoustic wave superposition and export tube are both equal to the included angle of the V-shaped groove corresponding to the acoustic wave introduction tube.

[0053] Among them, there can be multiple pairs of acoustic wave introduction tubes in the horn unit. Since the propagation of acoustic waves is a wave process, interference phenomena will occur when multiple beams of acoustic waves propagate simultaneously, and local enhancement and weakening of sound energy will occur in the sound field. Therefore, by adjusting the propagation characteristics of different acoustic waves, the propagation waveform can be artificially controlled, and then the energy distribution in the sound field can be changed. This not only reduces the energy loss caused by geometric attenuation during propagation but also obtains a relatively high sound pressure level and energy in the target direction, thereby maximizing the energy utilization rate.

[0054] In some embodiments, the first sound wave introduction tube and the second sound wave introduction tube of each pair of sound wave introduction tubes are symmetrically arranged, the specifications of each pair of sound wave introduction tubes are the same, and each pair of sound wave introduction tubes are arranged along the extension direction of their V-shaped grooves.

[0055] Among them, the first sound wave introduction tube and the second sound wave introduction tube can be symmetrically arranged about the midline of the V-shaped groove, and the first trapezoidal side of the first sound wave introduction tube and the first trapezoidal side of the second sound wave introduction tube can be symmetrically arranged, so that the sound wave is transmitted to the sound wave superposition export tube at the same time during transmission, and the symmetrical arrangement can make it have a better superposition effect. The specifications of each pair of sound wave introduction tubes are the same, which can indicate that the size, dimension data, shape, mass, and volume of the sound wave introduction tubes are the same, and can also indicate that the angles of the V-shaped grooves between each pair of sound wave introduction tubes are the same. In addition, the extension direction of the V-shaped groove can be perpendicular to the direction of the first trapezoidal side and the second trapezoidal side of the sound wave superposition export tube, so that each pair of sound wave introduction tubes can be aligned in the extension direction of the V-shaped groove.

[0056] Figure 2 FIG. 1 is a schematic diagram of the structure of a horn array device in one embodiment of the present invention. Figure 2 As shown, exemplarily, when there are three pairs of sound wave introduction tubes in the horn unit at the same time, the three pairs of sound wave introduction tubes have the same size and the same angle of the V-shaped grooves, and each pair of sound wave introduction tubes is arranged and aligned in a direction perpendicular to the first trapezoidal side surface and the second trapezoidal side surface of the sound wave superposition outlet tube.

[0057] In some embodiments, the sum of the lengths of the bases of the second trapezoidal side surfaces of the first sound wave inlet tube of each pair of sound wave inlet tubes adjacent to the second square side surfaces of the sound wave superposition outlet tube is equal to the lengths of the corresponding sides of the second square side surfaces of the sound wave superposition outlet tube.

[0058] Among them, the sum of the second trapezoidal side faces of the first sound wave introduction tube in each pair of sound wave introduction tubes is equal to the length of the corresponding side faces of the second square side faces of the sound wave superposition export tube, and the corresponding side faces of the second square side faces of the sound wave superposition export tube are the sides connected to the second trapezoidal side faces of the first sound wave introduction tube.

[0059] In some embodiments, the end of the sound wave superposition outlet tube with a larger cross-section extends outward through its first square side and second square side at the same time and combines with the matching extension parts of its first trapezoidal side and second trapezoidal side to form a square sound outlet.

[0060] Among them, the square sound outlet allows sound waves to be infinitely superimposed at the square sound outlet, thereby increasing the sound pressure level and cascading each module with two front horns to concentrate the sound at one point; Figure 3 This is a schematic diagram of the superposition of sound waves, such as Figure 3 As shown, Figure 3(a) in it indicates that during the superposition process of sound waves, the sound waves overlap with each other and have poor directivity; Figure 3 (b) in it indicates that the mutual superposition effect between sound waves is enhanced and has better directivity. From Figure 3 (b), it can be shown that the present invention can reduce the mutual cancellation between sound waves, and the formed square sound outlet can make the sound transmission effect of the sound waves better.

[0061] In some embodiments, at least one side of the square sound outlet of the sound wave superposition outlet pipe extends vertically outward to form an edge portion, and the edge portion is used to fix the horn unit to an external device.

[0062] Among them, extending the square sound outlet vertically outward to form an edge portion can facilitate fixing to an external device, and by arranging a plurality of screw holes at the formed edge portion, it can be tightly fixed to the external device, so as to prevent the horn unit from shaking in the external device during use and reducing the sound wave transmission.

[0063] Such as Figure 2 As shown, according to another aspect of the embodiment of the present invention, a horn array device is provided, including: a plurality of horn units as described in any of the above embodiments; the square sound outlets of the sound wave superposition outlet pipes in each horn unit face the same direction and are arranged flush.

[0064] Among them, the square sound outlets of the sound wave superposition outlet pipes of each horn unit can be arranged in the same direction to emit sound waves and achieve the enhancement of sound waves. For example, three horn units can be placed horizontally and the square sound outlets of the three horn units face the same direction, or three horn units can be placed vertically along the same plane and the orientations of the three horn units remain the same. Arraying a plurality of horn units can facilitate their superposition use during the process of use. Thus, by cascading the horn units, high sound effect deterrence with various different requirements can be achieved.

[0065] Figure 4 It is a schematic structural diagram of a sound generating device according to an embodiment of the present invention. Such as Figure 4 As shown, according to another aspect of the embodiment of the present invention, a sound generating device is provided, including: a horn unit, a vibration unit, and a control unit as described in any of the above embodiments; wherein, each first circular sound outlet and each second circular sound outlet of the horn unit are each installed with a vibration unit; the control unit is used to input a synchronous control signal to each vibration unit so that each vibration unit generates the same sound wave signal.

[0066] Among them, the control unit transmits a control signal to the vibration unit, causing the piezoelectric ceramics in the vibration unit to vibrate to generate an acoustic wave signal, and transmitting it to the horn unit. In the horn unit, the acoustic wave signals transmitted by each vibration unit are superimposed, and the superimposed acoustic wave signal is propagated directionally.

[0067] Figure 5 It is a schematic structural diagram of the vibration unit according to an embodiment of the present invention. As Figure 5 shown, the vibration unit includes a phase plug, a short horn, a piezoelectric ceramic diaphragm, a sound film, and a resonance sound generating cavity;

[0068] Figure 6 It is a schematic structural diagram of the phase plug according to an embodiment of the present invention. As Figure 6 shown, the phase plug includes a central axis portion 10 and a plurality of rib fins 20; one end of the central axis portion of the phase plug is in the shape of a first cone 11, and the other end is in the shape of a second cone; the bottom of the first cone 11 is completely aligned and connected to the bottom of the second cone, and the height of the first cone 11 is greater than the height of the second cone; the top of the second cone is used for bonding the middle part of the sound film that can be taperedly matched with the second cone; the plurality of rib fins 20 are erected on the side surface of the first cone 11, and the planes where each rib fin 20 is located coincide with the axial section of the first cone 11; each rib fin includes a first side, a second side 21, and a third side 22. The first side of the rib fin is arranged along the side surface of the first cone 11, the second side 21 of each rib fin extends along one side of the cross-section of the second cone, and the contours formed by the second sides 21 of all rib fins are in the shape of the side surface of a frustum of a cone and are on the same conical surface as the side surface of the second cone. The third sides 22 of all rib fins can extend and converge at a point to form a conical surface contour surrounding the side surface of the first cone 11; the included angle between the planes of adjacent two rib fins is a set angle; the short horn includes an acoustic wave constraint portion and an outer peripheral portion; the acoustic wave constraint portion includes a contraction portion and a cylindrical portion, and the thinner end of the port of the contraction portion is connected to one end of the cylindrical portion to form a funnel shape; the inner peripheral surface of the contraction portion surrounds the outside of the third sides of all rib fins of the phase plug to form an acoustic wave transmission channel between every two adjacent rib fins; Figure 7 It is a schematic structural diagram of the resonance sound generating cavity according to an embodiment of the present invention. As Figure 7 shown, the outer peripheral portion surrounds the outer periphery of the acoustic wave constraint portion to cooperate with the resonance sound generating cavity to form a resonance sound generating cavity for accommodating the phase plug, the sound film, and the piezoelectric ceramic diaphragm; the top of the second cone of the phase plug bonds the middle part of one side of the sound film; the other side of the sound film bonds the middle part of the ceramic surface of one side of the piezoelectric ceramic diaphragm; Figure 8 It is a schematic bottom structure diagram of the short horn according to an embodiment of the present invention. As Figure 8As shown, the other end of the cylindrical portion is connected to the circular sound outlet of the horn unit to form a channel for superimposing sound waves.

[0069] Among them, since the bottoms of the two cones in the central part of the phase plug are completely aligned and joined, the height of the first cone is greater than that of the second cone, and the taper of the second cone is related to the diaphragm bonded to the taper of the second cone; therefore, the taper of the first cone is related to the first cone. There are uniform intervals between the multiple fins of the phase plug, so that sound waves can be squeezed out from between each fin, and the convergence point of the extension lines of each fin can also coincide with the cone angle of the first cone. The fins are used to guide the sound waves, so as to converge the sound waves to the cone head. Moreover, the squeezing of the sound waves between the fins can increase the sound pressure level of the sound waves. In addition to squeezing and propagating the sound waves through the fins, a prism can also be used to set the sound wave channel. For example, the shape of the fin of the phase plug for forming the sound wave channel can be a quadrangular prism. One end connected to the second cone is the first rectangle, and one end connected to the first cone is the second rectangle. The first rectangle is parallel to the second rectangle, and the shape of the surface opposite to the central body is trapezoidal. The upper base of the trapezoid coincides with the wide side of the second rectangle, the lower base coincides with the wide side of the first rectangle, and the extension line of the perpendicular bisector of the trapezoid converges at the vertex of the cone angle of the first cone.

[0070] In some embodiments, the angle range between the planes where two adjacent fins are located is from 12 degrees to 18 degrees. Among them, the angle between two adjacent fins is related to the sound wave frequency. The greater the sound wave frequency, the smaller the included angle of the fins of the phase plug. The angle between the planes where two adjacent fins are located can be 12 degrees, 13 degrees, 14 degrees, 15 degrees, 16 degrees, 17 degrees or 18 degrees, etc. For example, the angle between the planes where two adjacent fins are located is 18 degrees.

[0071] In some embodiments, the taper range of the first cone is from 10 degrees to 16 degrees. Among them, the taper range of the phase plug is a set taper range that can reflect the sound waves in the frequency band sensitive to the human ear and superimpose them in the same phase. This taper is related to the taper of the second cone. The taper of the first cone can be 10 degrees, 11 degrees, 12 degrees, 13 degrees, 14 degrees, 15 degrees or 16 degrees and other angles. For example, the taper of the first cone is 10 degrees.

[0072] The angle formed by the side wall of the contraction part of the short horn and the central axis needs to be equal to the angle formed by the third side of the rib of the phase plug and the central axis. When the phase plug is placed in the short horn, the inner side wall of the contraction part and the phase plug can be closely attached together. During the transmission of sound waves, the sound waves will not be transmitted from other positions outside the sound wave transmission channel formed by the two. Moreover, multiple grooves can be provided on the inner side wall, and fixing parts can be provided on the outer side of the phase plug, so that the grooves on the inner side wall can be combined with the fixing parts of the phase plug to achieve the purpose of fixing the phase plug. A groove for fixing the silica gel pad is provided on the peripheral part of the end of the short horn where the phase plug is placed. The end of the short horn combined with the resonant sound cavity can be closely joined together, so that the sound waves will not propagate outward from the joint of the two, and the sound waves are transmitted by pushing the air and the air is pushed outwards. And in the formed space, a piezoelectric ceramic sheet, a sound film, a silica gel pad and a phase plug are accommodated. The short horn increases the compression ratio by reducing the area of the sound wave unit radiation outlet, increasing the number of sound wave radiation outlets, and restricting the angle of sound wave radiation, so as to achieve the purpose of increasing the sound pressure level. This vibration unit can ensure that the energy of the sound waves can be directly radiated, and the loss of the radiated energy is extremely low, and there will be no situation of reverberation back and forth, thus avoiding the time difference caused by reverberation back and forth. Because if there is a time difference, the sound waves will not reach the peak at the same time during the superposition process of the sound waves, and the best effect of sound wave superposition cannot be achieved.

[0073] Therefore, according to the characteristic of resonant energy storage during vibration according to the frequency response of the human ear's sensitive frequency band, when the volume of the resonant sound cavity reaches a certain volume, the highest sound pressure level is achieved. Through the design of the taper of the phase plug corresponding to the wavelength at the resonant frequency in the human ear's sensitive frequency band, the reflection of the sound waves and the full superposition of the same phase can be realized. And during the transmission of the sound waves at the resonant frequency, superposition is achieved at the peak of the vibration amplitude, avoiding the phenomenon of mutual cancellation of energy due to opposite phases, which is beneficial to the axial constraint and transmission of the sound waves.

[0074] In some embodiments, the piezoelectric ceramic diaphragm includes: a circular metal sheet and a circular piezoelectric ceramic film bonded to one side surface of the metal sheet; the diameter range of the piezoelectric ceramic film is from 26.55 mm to 37.55 mm, and the diameter range of the metal sheet is from 28 mm to 39 mm. Among them, the diameter of the piezoelectric ceramic film is smaller than the diameter of the metal sheet; the thickness range of the piezoelectric ceramic film is from 285 μm to 315 μm, and the thickness range of the metal sheet is from 190 μm to 210 μm; the piezoelectric ceramic film includes oxygen element, titanium element, zirconium element, lead element, strontium element and niobium element. Among them, the content range of strontium element is from 3.56% to 3.94%, and the content range of niobium element is from 5.38% to 5.95%.

[0075] Since the diameter of the piezoelectric ceramic diaphragm is smaller than that of the metal sheet, the diameter of the piezoelectric ceramic diaphragm can be 26.55 mm, 26.65 mm, 26.75 mm, 26.85 mm, 26.95 mm, 27.05 mm, 27.15 mm, 27.25 mm, 27.35 mm, 27.45 mm, 29.50 mm, 29.53 mm, 29.55 mm, 29.57 mm, 29.61 mm, 29.64 mm, 29.66 mm, 29.68 mm, 29.78 mm, 29.88 mm, 29.98 mm, 30.08 mm, or 30.18, etc. The diameter of the metal sheet can be 28.12 mm, 28.22 mm, 28.34 mm, 28.45 mm, 28.53 mm, 28.55 mm, 28.67 mm, 28.79 mm, 28.85 mm, 29.15 mm, 29.28 mm, 31.56 mm, 31.58 mm, 31.60 mm, 31.63 mm, 31.67 mm, 31.69 mm, 31.71 mm, or 32.12 mm, etc. Or the diameter of the piezoelectric ceramic diaphragm can also be set to 29.75 mm, 29.77 mm, 29.79 mm, 29.82 mm, 29.84 mm, 29.85 mm, 29.88 mm, or 29.91 mm; the diameter of the metal sheet can be set to 30.23 mm, 30.25 mm, 30.27 mm, 30.30 mm, 30.31 mm, 30.33 mm, 30.36 mm, 30.38 mm, or 31.21 mm, etc. The thickness of the piezoelectric ceramic diaphragm can be set to 285 μm, 287 μm, 289 μm, 290 μm, 291 μm, 293 μm, 296 μm, or 299 μm, etc.; the thickness of the metal sheet can be set to 190 μm, 191 μm, 193 μm, 194 μm, 196 μm, 198 μm, 201 μm, or 203 μm, etc.

[0076] By adjusting the content of each element in the piezoelectric ceramic diaphragm, it can have higher toughness during use, enabling it to be used for a longer time and not easily break during use. The content of strontium element can be set to 3.56%, 3.57%, 3.59%, 3.61%, 3.63%, 3.66%, 3.68%, or 3.70%, etc., and the content of niobium element can be set to 5.38%, 5.40%, 5.41%, 5.43%, 5.46%, 5.48%, 5.51%, or 5.53%, etc. By adjusting the content of each element in the piezoelectric ceramic diaphragm, the ceramic grains can grow more uniformly, and the pores of the generated grains are fewer. Its compactness is good, and the conduction efficiency is high. Furthermore, it can generate better sound stimulation.

[0077] Exemplarily, the diameter of the piezoelectric ceramic diaphragm is set to 29.53 mm, the diameter of the metal sheet is set to 31.58 mm, or the diameter of the piezoelectric ceramic diaphragm is set to 29.77 mm, and the diameter of the metal sheet is set to 31.21 mm. The thickness of the piezoelectric ceramic diaphragm is set to 289 μm, and the thickness of the metal sheet is set to 193 μm. Since the bottoms of the two cones in the central part of the phase plug are completely aligned and joined, the height of the first cone is greater than that of the second cone, and the taper of the second cone is related to the voice coil bonded to the taper of the second cone; therefore, the taper of the first cone is related to the first cone. There is a uniform interval between the multiple fins of the phase plug, so that sound waves can be squeezed out from between each fin, and the convergence point of the extension lines of each fin can also coincide with the cone angle of the first cone. The fins are used to guide the sound waves, so as to converge the sound waves to the cone head, and the squeezing of the sound waves between the fins can increase the sound pressure level of the sound waves. In addition to squeezing and propagating the sound waves through the fins, a prism can also be used to set the sound wave channel. For example, the shape of the fin of the phase plug for forming the sound wave channel can be a quadrangular prism. One end connected to the second cone is a first rectangle, and one end connected to the first cone is a second rectangle. The first rectangle and the second rectangle are parallel, and the shape of the surface opposite to the central body is a trapezoid. The upper base of the trapezoid coincides with the wide side of the second rectangle, the lower base coincides with the wide side of the first rectangle, and the extension line of the perpendicular bisector of the trapezoid converges at the vertex of the cone angle of the first cone.

[0078] In some embodiments, the piezoelectric ceramic diaphragm includes a first piezoelectric ceramic diaphragm, a second piezoelectric ceramic diaphragm, and a metal sheet; the first piezoelectric ceramic diaphragm and the second piezoelectric ceramic diaphragm are symmetrically bonded to both sides of the metal sheet.

[0079] Wherein, one side of the metal sheet of the piezoelectric ceramic diaphragm is bonded to the first piezoelectric ceramic diaphragm, the other side of the metal sheet is bonded to the second piezoelectric ceramic diaphragm, the sizes of the first piezoelectric ceramic diaphragm and the second piezoelectric ceramic diaphragm are the same, and the bonding positions of the first piezoelectric ceramic sheet and the second piezoelectric ceramic sheet on both sides of the metal sheet are symmetric with each other to generate a force for increasing the sound wave energy.

[0080] In some embodiments, the vibration unit further includes: a silica gel pad disposed between the peripheral edge of the short horn and the voice coil.

[0081] Among them, the voltage withstand characteristic of the piezoelectric ceramic diaphragm is improved to increase the sound pressure level of the sound. A silicone pad with a suitable size can ensure that the piezoelectric ceramic diaphragm operates within a safe and stable vibration amplitude range under high voltage conditions. When the vibration unit is working, since the sound film and the phase plug will come into contact, although there is a certain gap between them, there will still be partial contact, and the change in the contact ratio will cause the frequency characteristics to change. The height of the silicone pad can determine the contact ratio between the sound film and the phase plug during operation.

[0082] In some embodiments, the thickness range of the silicone pad is 1.5 mm to 3 mm. Among them, the thickness of the silicone pad can be 1.51 mm, 1.53 mm, 1.54 mm, 1.55 mm, 1.56 mm, 1.58 mm, 1.59 mm, 2.11 mm, 2.12 mm, 2.30 mm, 2.31 mm, etc. When selecting the height of the silicone pad, it can be selected according to the actual required frequency characteristics to achieve the best effect of the desired sound wave.

[0083] In some embodiments, the sound film is a paper sound film, and the mass of the paper sound film is 0.2×(1±5%) g. Among them, the mass range of the paper sound film is 0.2 g×(1 - 5%) to 0.2 g×(1 + 5%), that is, the mass range of the paper sound film is 0.19 g to 0.21 g. For example, the mass of the paper sound film can be 0.191 g, 0.193 g, 0.195 g, 0.197 g, 0.199 g, 0.201 g, or 0.203 g, etc. And, since a single characteristic among the elastic modulus, mass, and compliance can determine the degree of sound distortion and frequency response; by comparing the elastic modulus, mass, and compliance of the PVC sound film, polymer sound film, and paper sound film, it can be concluded that when the mass of the paper sound film is 0.2×(1±5%) g, the sound pressure level index is the highest when it is paired with the piezoelectric ceramic diaphragm to form a vibration unit. If ordinary sound films and other sound films are used, it can be found that the distortion of restoring human voices is high.

[0084] By testing the effects of the sound - generating device composed of Figure 1 the horn unit shown and Figure 5 the vibration unit shown. As shown by Figure 9 Figure 9 It represents the frequency response curves generated by different sound - generating devices. Among them, curve 1 represents the effect generated when testing with the best device composed of the structure with the best parameters. For example, when using Figure 1The horn unit shown is used to set various parameters of the horn unit, such as the included angle of the V-shaped groove, the depth of the acoustic wave superposition outlet pipe, etc.; the vibration unit connected to the horn unit is a piezoelectric ceramic sheet made of a piezoelectric ceramic diaphragm with a set material ratio, and a phase plug with a set angle, etc. Curve 2 represents the change in the frequency response generated by a moving coil loudspeaker in the prior art. In the frequency band sensitive to the human ear, that is, 3 kHz to 5 kHz in the figure, it can be seen that curve 1 reaches a peak, while curve 2 does not reach a peak; and, when the frequency is greater than 10 kHz, curve 1 continuously rises, while curve 2 continuously decays. As can be seen from the figure, the sensitivity of the device of the present invention represented by curve 1 is significantly higher than that of the moving coil loudspeaker represented by curve 2 after the frequency of 1.1 kHz, and according to the formula, if the sensitivity of the device is 1 dB higher, the sound pressure level (SPL, Sound Pressure Level) will be 1 dB higher. When the frequency is 2 kHz for curves 1 and 2 in the figure, the effects generated by the two sound generating devices can differ by 20 dB, thereby demonstrating the great advantage of the present invention. In addition, the higher the frequency, the better its directivity, and at a frequency of 4.3 kHz, it is 25 dB higher than the moving coil loudspeaker, indicating that the frequency response characteristic of the sound generating unit already has the characteristic of strong directivity. Therefore, from Figure 9 it can be seen that using Figure 1 the horn unit shown can make the point source radiation be directionally transmitted according to the constraints of the frequency band, amplitude, radiation, and reflection angle of the sound source; and this module can be arrayed, and through the array, various acoustic devices with high sound effect deterrence and high sound pressure level for different requirements can be flexibly realized, and the purpose of infinitely increasing the sound pressure level can be achieved by using this acoustic device.

[0085] To enable those skilled in the art to better understand the invention, the following will illustrate the implementation manner of the present invention with specific embodiments.

[0086] Firstly, the high-performance sound generator is modularly transformed, and the vibration component and the external horn tube are designed into a module as a whole. This module as a whole is a basic component, and each module is an independent and usable device. This device includes a complete set of control circuits, an optimized modular sound generating unit (a unit that can be further arrayed after small-scale transformation), and a specific array horn design required externally.

[0087] If a higher sound pressure value effect is required, these modules are assembled and arranged. After simply performing a planar array, the energy of each array module can be automatically accumulated on a unified sound generating surface. According to the sound generating principle of the surface sound source, the area of this sound generating surface has no upper limit in principle. As long as there is enough space, a large number of temporary array installation spaces can be arranged, and the overall sound energy intensity can be increased infinitely.

[0088] First, form the unit overall module. For this unit sound - generating module, design the vibration unit and the front horn as shown in the following figure: For convenient stacking in the later stage, the opposed - beam group above needs to be stacked by X2, X3, or X4. After we select X3 and then form an array, it is convenient for later modular processing. This X3 method, that is, after a design of three in a group, can be conveniently connected in an array with multiple groups continuously, and a module can be formed.

[0089] Figure 10 It is a schematic structural diagram of the cascaded sound - generating device according to an embodiment of the present invention. As Figure 10 shown, and each single one is an independent device, or multiple ones can be connected in an array for use. Through this way, an array can be flexibly formed. Only after installation according to the arrangement and selection of the array connection method, the deterrence index and effect of the array can be greatly improved.

[0090] In summary, for the horn unit, horn array device, and sound - generating device of the embodiments of the present invention, by decomposing the high - performance acoustic - efficiency device into single independent working modules, the point - source radiation is made to be directionally transmitted according to the constraints of the frequency band, amplitude, radiation, and reflection angle of the sound source for the minimum sound - generating unit; and by arraying these modules, various high - sound - effect deterrence forces and multiple acoustic devices with high sound pressure levels that meet different requirements can be flexibly realized through arraying. By using this acoustic device, the sound pressure level can be increased without limit.

[0091] It should also be noted that in the present invention, the exemplary embodiments refer to describing some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above - mentioned steps. That is to say, the steps can be executed in the order mentioned in the embodiments, or different from the order in the embodiments, or several steps can be executed simultaneously.

[0092] In the present invention, the features described and / or illustrated for one embodiment can be used in the same way or in a similar way in one or more other embodiments, and / or combined with the features of other embodiments or replace the features of other embodiments.

[0093] The above are only the preferred embodiments of the present invention, and are not used to limit the present invention. For those skilled in the art, various changes and modifications can be made to the embodiments of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A horn unit, characterized in that, Comprising: A sound wave superposition outlet pipe and at least one pair of sound wave inlet pipes; Each pair of sound wave inlet pipes includes a first sound wave inlet pipe and a second sound wave inlet pipe; the first sound wave inlet pipe, the second sound wave inlet pipe, and the sound wave superposition outlet pipe all include a first trapezoidal side and a second trapezoidal side arranged in parallel and a first square side and a second square side arranged oppositely, and the cross-sections of the three are all squares that gradually become larger along the sound wave conduction direction; One end with a smaller cross-section of the first sound wave inlet pipe is formed with a first circular sound emitting port by transitioning from a square cross-section; one end with a smaller cross-section of the second sound wave inlet pipe is formed with a second circular sound emitting port by transitioning from a square cross-section; one end with a larger cross-section of the sound wave superposition outlet pipe is formed with a square sound outlet; one end with a larger cross-section of the first sound wave inlet pipe and one end with a larger cross-section of the second sound wave inlet pipe are both connected to one end with a smaller cross-section of the sound wave superposition outlet pipe, and the first trapezoidal side of the first sound wave inlet pipe and the first trapezoidal side of the second sound wave inlet pipe are adjacent to form a V-shaped groove, and the second trapezoidal side of the first sound wave inlet pipe and the second trapezoidal side of the second sound wave inlet pipe are respectively adjacent to the first square side and the second square side of the sound wave superposition outlet pipe, so that two identical sound wave signals are respectively introduced into the first sound wave inlet pipe from the first circular sound emitting port and into the second sound wave inlet pipe from the second circular sound emitting port, and then are superimposed in the sound wave superposition outlet pipe and the superimposed and enhanced sound wave signal is transmitted out from the square sound outlet; Wherein, the respective sides of the opposite first square side and second square side are aligned, and the included angle of the V-shaped groove is the included angle formed by the connection of the first sound wave inlet pipe and the second sound wave inlet pipe at the sound wave superposition outlet pipe; The included angles of the V-shaped grooves corresponding to each pair of sound wave inlet pipes are all equal, and the included angles of the extensions of the two waists of the first trapezoidal side and the second trapezoidal side of the sound wave superposition outlet pipe are both equal to the included angle of the V-shaped groove corresponding to the sound wave inlet pipe; The first sound wave inlet pipe and the second sound wave inlet pipe of each pair of sound wave inlet pipes are symmetrically arranged, the specifications of each pair of sound wave inlet pipes are the same, and each pair of sound wave inlet pipes is arranged along the extension direction of its V-shaped groove; The first sound wave inlet pipe and the second sound wave inlet pipe are symmetrically arranged with respect to the midline of the V-shaped groove, and the first trapezoidal side of the first sound wave inlet pipe is symmetrically arranged with the first trapezoidal side of the second sound wave inlet pipe.

2. The horn unit according to claim 1, characterized in that, The included angle range of the V-shaped groove is 15 degrees to 20 degrees.

3. The horn unit according to claim 1, characterized in that, The depth of the sound wave superposition outlet pipe is between one time and two times the wavelength of the incoming sound wave signal.

4. The horn unit according to claim 1, wherein, The sum of the lengths of the bases of the second trapezoidal sides of the first sound wave inlet pipes of each pair of sound wave inlet pipes adjacent to the second square side of the sound wave superposition outlet pipe is equal to the length of the corresponding side of the second square side of the sound wave superposition outlet pipe.

5. The horn unit according to claim 1, characterized in that One end with a larger cross-section of the sound wave superposition outlet pipe forms a square sound outlet by simultaneously extending and expanding through its first square side and second square side and combining with the cooperating extension parts of its first trapezoidal side and second trapezoidal side.

6. The horn unit according to claim 1, characterized in that, At least one side of the square sound outlet of the acoustic superposition outlet pipe extends vertically outwards to form an edge portion, and the edge portion is used to fix the horn unit to an external device.

7. A horn array device, characterized in that, Comprising: A plurality of horn units as described in any one of claims 1 to 6; the square sound outlets of the acoustic superposition outlet pipes in each horn unit have the same orientation and are arranged flush.

8. A sound generating device, characterized in that, Comprising: A horn unit, a vibration unit and a control unit as described in any one of claims 1 to 6; wherein, each first circular sound outlet and each second circular sound outlet of the horn unit are each provided with a vibration unit; the control unit is used to input a synchronous control signal to each vibration unit so that each vibration unit generates the same acoustic signal.

9. The sound generating device according to claim 8, wherein, The vibration unit includes a phase plug, a short horn, a piezoelectric ceramic diaphragm, a sound film and a resonance sound cavity; The phase plug includes a central axis portion and a plurality of fins; one end of the central axis portion of the phase plug is in the shape of a first cone, and the other end is in the shape of a second cone; the bottom of the first cone is completely aligned and joined with the bottom of the second cone, and the height of the first cone is greater than the height of the second cone; the top of the second cone is used for bonding the middle part of the sound film that can be tapered to match the second cone; the plurality of fins are erected on the side surface of the first cone, and the planes where each fin is located coincide with the axial section of the first cone; each fin includes a first side, a second side and a third side, the first side of the fin is arranged along the side surface of the first cone, the second side of each fin extends along one side of the cross section of the second cone, and the contour formed by the second sides of all the fins is in the shape of the side surface of a frustum of a cone and is on the same conical surface as the side surface of the second cone, and the third sides of all the fins can extend and converge at a point to form a conical surface contour surrounding the side surface of the first cone; the included angle between the planes where two adjacent fins are located is a set angle; The short horn includes an acoustic constraint portion and a peripheral portion; the acoustic constraint portion includes a contraction portion and a cylindrical portion, and the thinner end of the port of the contraction portion is joined with one end of the cylindrical portion to form a funnel shape; the inner peripheral surface of the contraction portion surrounds the outside of the third sides of all the fins of the phase plug to form an acoustic transmission channel between every two adjacent fins; the peripheral portion surrounds the outside of the acoustic constraint portion to cooperate with the resonance sound cavity to form a resonance sound cavity for accommodating the phase plug, the sound film and the piezoelectric ceramic diaphragm; the top of the second cone of the phase plug bonds the middle part of one side of the sound film; the other side of the sound film bonds the middle part of one side ceramic surface of the piezoelectric ceramic diaphragm; the other end of the cylindrical portion is joined with the circular sound outlet of the horn unit to form a channel for superimposing acoustic waves; The convergence point of the extension lines of each fin coincides with the cone angle of the first cone, and the included angle between the side wall of the contraction portion of the short horn and the central axis is equal to the included angle between the third side of the fin of the phase plug and the central axis.

10. The sound generating device according to claim 9, wherein The piezoelectric ceramic diaphragm includes: a circular metal sheet and a circular piezoelectric ceramic film bonded to one side surface of the metal sheet; The diameter range of the piezoelectric ceramic diaphragm is from 26.55 mm to 37.55 mm, and the diameter range of the metal sheet is from 28 mm to 39 mm. Among them, the diameter of the piezoelectric ceramic diaphragm is smaller than that of the metal sheet; the thickness range of the piezoelectric ceramic diaphragm is from 285 μm to 315 μm, and the thickness range of the metal sheet is from 190 μm to 210 μm; The piezoelectric ceramic diaphragm includes oxygen element, titanium element, zirconium element, lead element, strontium element and niobium element. Among them, the content range of strontium element is from 3.56% to 3.94%, and the content range of niobium element is from 5.38% to 5.95%.

11. The sound generating device according to claim 10, wherein The phase plug includes: the angle range of the included angle between the planes where two adjacent rib fins are located is from 12 degrees to 18 degrees; the taper range of the first cone is from 10 degrees to 16 degrees.

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