Audio device

Abstract

The application discloses an audio device, which comprises a sound generating part, the sound generating part comprising a shell, at least one loudspeaker unit; the loudspeaker unit comprising at least one diaphragm; a first cavity is formed between the vibrating outer surface of the diaphragm and the inner wall of the shell; the back side of the loudspeaker unit and the shell form a second cavity; the first cavity is provided with a first sound hole and a second sound hole; the second cavity is provided with a third sound hole and a fourth sound hole; the center positions of the projections of the first sound hole, the second sound hole, the third sound hole and the fourth sound hole on the plane perpendicular to the vibration direction of the diaphragm form a quadrilateral. The technical scheme of the application has better attenuation on the middle and low frequency bands, especially the middle frequency band sensitive to human ears, and can effectively prevent sound leakage on the non-in-ear audio device, thereby improving the privacy of users.

Description

Audio Devices

[0001] This application claims priority to the Chinese patent application with application number 202310792110.5 and application name “A sound leakage prevention audio device” filed with the China Patent Office on June 30, 2023, and priority to the Chinese patent application with application number 202310792176.4 and application name “A audio device”, all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to a sound-generating device, and more particularly, to an audio device. Background Art

[0003] At present, most of the existing open audio devices use the front and rear of the speaker unit diaphragm or drive two independent diaphragms to form a dipole sound source for sound attenuation to prevent sound leakage. However, compared with a multipole sound source (such as a quadrupole sound source), a dipole sound source cannot achieve the sound leakage prevention effect of a multipole sound source. The sound leakage prevention effect is not ideal, the sound is easy to leak out, and there are problems such as easy interference with others and poor privacy, which affects the user experience.

[0004] Summary of the Invention

[0005] The purpose of this application is to provide an audio device to solve the problem of poor sound leakage effect of current audio devices.

[0006] In a first aspect, the present application discloses an audio device, comprising: a sound-emitting portion, the sound-emitting portion comprising a shell and at least one speaker unit, the speaker unit comprising at least one diaphragm, the speaker unit being arranged inside the shell, the front end wall of the diaphragm and the inner circumferential wall of the front end portion of the shell forming a first cavity, the rear end wall of the diaphragm and the inner circumferential wall of the rear end portion of the shell forming a second cavity, the first cavity being provided with a first sound outlet and a second sound outlet, the second cavity being provided with a third sound outlet and a fourth sound outlet, the first sound outlet, the second sound outlet, the third sound outlet and the fourth sound outlet being respectively projected onto a plane perpendicular to the vibration direction of the diaphragm to form a first projected area, a second projected area, a third projected area and a fourth projected area, the distance between the center points of the first projected area, the second projected area, the third projected area and the fourth projected area being in the range of 0 mm to 25 mm, and the first projected area and the second projected area being respectively located on both sides of the straight line connecting the center points of the third projected area and the fourth projected area.

[0007] In a second aspect, the present application discloses an audio device, comprising: a sound-emitting portion, the sound-emitting portion comprising a housing and at least one speaker unit, the speaker unit comprising at least one diaphragm, the speaker unit being disposed within the housing, the front end wall of the diaphragm and the inner circumferential wall of the front end portion of the housing enclosing a first cavity, the rear end wall of the diaphragm and the inner circumferential wall of the rear end portion of the housing enclosing a second cavity, the first cavity being provided with a first sound outlet and a second sound outlet, the second cavity being provided with a third sound outlet and a fourth sound outlet, the first sound outlet, the second sound outlet, the third sound outlet, and the fourth sound outlet being projected onto a plane perpendicular to a vibration direction of the diaphragm, respectively, to form a first projected area, a second projected area, a third projected area, and a fourth projected area, the distance between the center points of each of the first projected area, the second projected area, the third projected area, and the fourth projected area being in a range of 0 mm to 25 mm, and the first projected area and the second projected area being located on a straight line connecting the center points of the third projected area and the fourth projected area, or being located on the same side of a straight line connecting the center points of the third projected area and the fourth projected area.

[0008] In combination with the above technical solution, the present application provides a first cavity and a second cavity at the front and rear ends of the speaker unit, and provides a first sound outlet and a second sound outlet in the first cavity, and provides a third sound outlet and a fourth sound outlet in the second cavity. The sound emitted by the first sound outlet and the second sound outlet has the same amplitude and opposite phase to the sound emitted by the third sound outlet and the fourth sound outlet, thereby forming a multi-pole sound source. The multi-pole sound source has better attenuation for the mid- and low-frequency bands, especially the mid-frequency band to which the human ear is sensitive. When used on non-in-ear audio devices, it can effectively prevent sound leakage and improve user privacy. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a diagram showing the principle of sound generation by a dipole sound source;

[0010] Figure 2 is a diagram showing the principle of sound generation by a quadrupole sound source;

[0011] FIG3 is a diagram showing the structure and name of a human ear auricle model;

[0012] FIG4 is a front view of an audio device according to an embodiment of the present application;

[0013] FIG5 is a right side view of an audio device according to an embodiment of the present application;

[0014] FIG6 is a rear view of an audio device according to an embodiment of the present application;

[0015] FIG7 is a left side view of an audio device according to an embodiment of the present application;

[0016] FIG8 is a diagram of an audio device in a wearing state according to an embodiment of the present application;

[0017] FIG9 is a schematic diagram of the projection of FIG8 on the YZ plane;

[0018] 10( a ) to 10 ( j ) are diagrams illustrating the arrangement of a first sound hole, a second sound hole, a third sound hole, and a fourth sound hole of an audio device of the present application;

[0019] Figures 11(a) to 11(h) are layout diagrams of Figures 10(a) to 10(j) rotated at a certain angle;

[0020] FIG12 is a structural diagram of an audio device having a protruding structure according to an embodiment of the present application;

[0021] FIG13 is a structural diagram of a speaker unit of an audio device having a dual-diaphragm single voice coil according to an embodiment of the present application;

[0022] FIG14 is a structural diagram of a speaker unit of an audio device having dual diaphragms and dual voice coils according to another embodiment of the present application;

[0023] FIG15 is a structural diagram of a speaker unit of an audio device according to another embodiment of the present application, which includes a passive diaphragm and a single voice coil;

[0024] FIG16 is a structural diagram of a speaker unit of an audio device according to another embodiment of the present application, which has a single diaphragm and a single voice coil;

[0025] FIG17 is a structural diagram of an audio device according to another embodiment of the present application, wherein the speaker unit comprises two speakers;

[0026] FIG18 is a structural diagram of an audio device according to another embodiment of the present application, wherein the speaker unit comprises four speakers;

[0027] FIG19 is a structural diagram of an audio device according to another embodiment of the present application, wherein the speaker unit comprises two dual-diaphragm speakers;

[0028] FIG20 is a comparison diagram of frequency response curves of a quadrupole sound source and a dipole sound source of an audio device according to an embodiment of the present application;

[0029] FIG21 is a comparison diagram of sound leakage curves of a quadrupole sound source and a dipole sound source of an audio device according to an embodiment of the present application;

[0030] FIG22 is a perspective view of an audio device of the present application;

[0031] FIG23 is a front view of an audio device of the present application;

[0032] FIG24 is a rear view of an audio device of the present application;

[0033] FIG25 is a schematic diagram of an audio device with a protruding structure according to the present application;

[0034] FIG26 is a diagram of an audio device of the present application in a wearing state;

[0035] FIG27 is a schematic diagram of the projection of FIG26 on the YZ plane;

[0036] FIG28 is a schematic diagram of the projection of FIG26 on the XY plane;

[0037] FIG29 is a diagram showing another structure of an audio device of the present application in a wearing state;

[0038] FIG30 is a schematic diagram of the projection of FIG29 on the YZ plane;

[0039] FIG31 is a schematic diagram of a projection of the audio device of FIG29 on the XY plane;

[0040] FIG32 is a cross-sectional view of a dual-diaphragm single voice coil audio device of the present application;

[0041] FIG33 is a cross-sectional view of a dual-diaphragm dual-voice coil audio device of the present application;

[0042] FIG34 is a cross-sectional view of a single-diaphragm single-voice coil audio device of the present application;

[0043] FIG35 is a cross-sectional view of a dual-diaphragm single voice coil type audio device of the present application. DETAILED DESCRIPTION

[0044] In the embodiments of this application, the term "and / or" describes the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0045] In the embodiments of the present application, the term "plurality" refers to two or more than two, and other quantifiers are similar.

[0046] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0047] The principle of dipole-to-multipole construction is as follows: a multipole sound source can be considered a combination of dipole sound sources with opposite polarity. The dipole sound source and the transverse quadrupole sound source are shown in Figures 1 and 2. The dipole sound source consists of point sound source 1 and point sound source 2 as shown in the figure. Point sound source 1 and point sound source 2 have the same amplitude and opposite phase, and are located at a distance d from the dipole sound source. The sound pressure P at a distance r from the dipole sound source is far The expression is shown in Formula 1.

[0048] The quadrupole sound source is composed of two dipole sound sources with opposite phases. As shown in Figure 2, point sound source 1 and point sound source 2 have the same amplitude, opposite phases, and a distance of d, forming the first dipole sound source; point sound source 3 and point sound source 4 have the same amplitude and opposite phases, and a distance of d, forming the second dipole sound source; the first dipole sound source and the second dipole sound source have opposite phases and a distance of D, as shown in the spatial layout of Figure 2, forming a transverse quadrupole sound source. The sound pressure P at a certain point r away from the transverse quadrupole sound source is 0. far As shown in formula 2.

[0049] In the above expressions 1 and 2: C - speed of sound

[0050] ρ——medium density

[0051] r——the distance from a certain position in the sound field to the sound source

[0052] d——Dipole sound source spacing

[0053] D——the distance between two dipole sound sources

[0054] Q——Surface volume velocity of sound source

[0055] k——wave node, k=2*π / λ

[0056] θ——Radiation angle of sound source.

[0057] By comparing expressions 1 and 2, the ratio between the quadrupole sound source and the dipole sound source is as shown in equation 3:

[0058] 4kDsinθ Formula (3)

[0059] For medium and low frequency sound waves, the wavelength λ is very large. When the distance between the two pairs of dipoles is small,

[0060] 4kDsinθ<1

[0061] When the amplitude of the point sound source is exactly the same, the sound pressure radiated by the quadrupole sound source is smaller than that of the dipole sound source. Therefore, it can be seen that the sound leaked out by the quadrupole sound source and the dipole sound source is smaller.

[0062] At the same time, it is also necessary to understand the structure of the auricle. Since this audio device is worn on the ear, it is necessary to know the names of the parts of the ear. The specific ear structure is shown in Figure 3.

[0063] The auricle models are simulators containing a head and its auricle designed and manufactured in accordance with IEC:60318-7 standard or ANSI:S3.36, S3.25 standard, such as B&K's 4128C simulation head and torso simulator or GRAS's 45BC KEMAR simulation head and torso simulator.

[0064] As shown in Figures 4 to 9, in one embodiment of the present application, the audio device includes a housing 10 and at least one speaker unit 20. The speaker unit 20 includes at least one diaphragm. A first cavity 11 is formed between the vibrating outer surface of the diaphragm and the inner wall of the housing 10. A second cavity 12 is formed between the rear side of the speaker unit 20 and the housing 10. The first cavity 11 is provided with a first sound outlet 13 and a second sound outlet 14. The second cavity 12 is provided with a third sound outlet 15 and a fourth sound outlet 16. The sound waves radiated from the first cavity 11 through the first sound outlet 13 and the second sound outlet 14 have the same amplitude and opposite phase to the sound waves radiated from the second cavity 12 through the third sound outlet 15 and the fourth sound outlet 16. The projections of the first sound outlet 13, the second sound outlet 14, the third sound outlet 15 and the fourth sound outlet 16 on a plane perpendicular to the vibration direction of the diaphragm form a first projection area 131, a second projection area 141, a third projection area 151 and a fourth projection area 161. The periphery of the line connecting the center positions of the four projection areas forms a quadrilateral. The first projection area 131 and the second projection area 141 are respectively located on both sides of the line connecting the center points of the third projection area 151 and the fourth projection area 161, as shown in Figure 9.

[0065] The closer the quadrilateral shape is to the rectangular shape of an ideal transverse quadrupole, the better the effect of preventing sound leakage.

[0066] In some embodiments, the quadrilateral is a parallelogram.

[0067] In some embodiments, the interior angle of the quadrilateral is greater than 28°; or, the included angle of the diagonals of the quadrilateral is less than 90°.

[0068] In one embodiment, the speaker unit 20 includes a diaphragm, with the first cavity 11 positioned on one side of the diaphragm and the second cavity 12 positioned in front of the diaphragm, away from the diaphragm. Due to the internal coupling structure of the speaker unit 20, the sound signals emitted from the sound outlet of the first cavity 11 and the second cavity 12 have the same amplitude but opposite phases. This embodiment involves a single speaker with a single diaphragm positioned within the housing 10, as shown in Figure 16.

[0069] In one embodiment, the speaker unit 20 is provided with two diaphragms, namely a first diaphragm 21 and a second diaphragm 22. The first diaphragm 21 corresponds to the first cavity 11, and the second diaphragm 22 corresponds to the second cavity 12. The sound signals radiated by the first diaphragm 21 and the second diaphragm 22 have the same amplitude and opposite phases. The design of two diaphragms can be implemented in the following ways:

[0070] 1. Provided by a dual-diaphragm, dual-voice coil speaker unit 20, as shown in Figure 14. The first diaphragm 21 is fixedly connected to one voice coil, and the second diaphragm 22 is fixedly connected to the other voice coil. The two voice coils drive their respective diaphragms to emit sound signals with the same amplitude and opposite phases. In some embodiments, the dual-diaphragm, dual-voice coil speaker unit 20 is electrically connected in series.

[0071] 2. Provided by a dual-diaphragm single-voice coil speaker unit 20, as shown in Figure 13. The first diaphragm 21 is fixedly connected to the voice coil, and the second diaphragm 22 is a passive diaphragm mounted and fixed on the speaker unit 20. The first diaphragm 21 and the second diaphragm 22 form a sealed cavity with the speaker unit housing. When the first diaphragm 21 is vibrated by a driving force, the first diaphragm 21 pushes the air in the sealed cavity, further pushing the second diaphragm 22 to vibrate in the same direction, so that the first diaphragm 21 and the second diaphragm 22 emit sound signals with the same amplitude and opposite phases. In this embodiment, the voice coil can be configured to connect the first diaphragm 21 and the second diaphragm 22 at the same time, so that the first diaphragm 21 and the second diaphragm 22 vibrate in the same direction under the drive of the voice coil.

[0072] 3. Provided by two speaker units 20, as shown in Figure 17. One speaker unit 20 is provided with a first diaphragm 21, and the other speaker unit 20 is provided with a second diaphragm 22. That is, the first diaphragm 21 and the second diaphragm 22 are both diaphragms on the two speaker units 20. By controlling the current of the circuit, the first diaphragms 21 and the second diaphragms 22 of the two speaker units 20 emit sound signals with the same amplitude and opposite phases;

[0073] 4. It is provided by a speaker unit 20 and a passive diaphragm mounted on the housing of the audio device, but the passive diaphragm is provided separately from the speaker unit, as shown in Figure 15. The speaker unit 20 itself is provided with a diaphragm (first diaphragm 21), which forms a dual diaphragm with a passive diaphragm (second diaphragm 22) provided on the audio device. The first diaphragm 21 and the second diaphragm 22 form a sealed space 28 between the housing of the audio device. When the first diaphragm 21 is vibrated by a driving force, it pushes the air in the sealed cavity, further pushing the second diaphragm 22 to vibrate in the same direction.

[0074] 3 and 8 , when worn, the first sound hole 13 and the second sound hole 14 are located between the antitragus, the antihelix, the tragus, and the crus of the antihelix. The third sound hole 15 and the fourth sound hole 16 are located between the antitragus, the antihelix, the tragus, and the crus of the antihelix. In some embodiments, the third sound hole 15 can also be located 5 mm from the base of the ear; or outside the auricle and 10 mm from the tragus. When worn, the relationship between the first sound hole 13, the second sound hole 14, the third sound hole 15, and the fourth sound hole 16 and the auricle allows the device to function optimally.

[0075] As shown in Figures 4 to 8 , the first and second sound outlets 13 and 14 are located on the first surface 103 and emit positive-phase signals. The center of the first sound outlet 13 is closer to the center of the ear canal opening than the center of the second sound outlet 14. The distances from the centers of the first and second sound outlets 13 and 14 to the center of the ear canal opening are less than or equal to 15 mm. The second sound outlet 14 is located closer to the cymba concha, with a distance of less than or equal to 10 mm from the cymba concha.

[0076] The third sound outlet hole 15 and the fourth sound outlet hole 16 are farther away from the ear canal opening than the first sound outlet hole 13 , and the distance from the third sound outlet hole 15 and the fourth sound outlet hole 16 to the ear canal opening is 20 mm to 35 mm.

[0077] In some embodiments, the fourth sound outlet 16 is located on the side surface 105 and faces the auricle. The fourth sound outlet 16 faces the area below the antarctic crus and the area below the antarctic crus.

[0078] In some embodiments, the closest distance between the center of the fourth sound hole 16 and the antihelix is ​​2 mm to 10 mm; the closest distance between the fourth sound hole 16 and the lower crus of the antihelix is ​​3 mm to 12 mm. When worn by a user, the angle between the fourth sound hole 16 and the vertical axis ranges from 10° to 35°.

[0079] In some embodiments, the third sound hole 15 is located on the side surface 105 and faces the anti-tragus. The closest distance between the center of the third sound hole 15 and the anti-tragus is 2-12 mm. When worn by the user, the angle between the third sound hole 15 and the vertical axis ranges from 10° to 35°.

[0080] In some embodiments, the opening area of ​​the first sound hole 13, the second sound hole 14, the third sound hole 15, and the fourth sound hole 16 is greater than or equal to 4 mm. 2 .

[0081] As shown in Figures 13 to 15, the interior of the housing 10 is provided with a first assembly surface 101 and a second assembly surface 102. The speaker unit 20 is fixed inside the housing 10 and is located between the first assembly surface 101 and the second assembly surface 102, such that the first diaphragm 21 is mounted on the first assembly surface 101 and the second diaphragm 22 is mounted on the second assembly surface 102. The other components of the speaker unit 20 are arranged in the cavity between the first assembly surface 101 and the second assembly surface 102.

[0082] In other embodiments, the surface connecting the first assembly surface 101 and the second assembly surface 102 is referred to as the inner surface. The first diaphragm 21 or the second diaphragm 22 can be disposed on the inner surface according to actual needs.

[0083] As shown in Figures 4 to 7, the outer surface of the shell 10 includes a first surface 103, a second surface 104 and a side surface 105. The first surface 103 is arranged near the ear hole, and the second surface 104 is arranged toward the outside. An outer surface of the first cavity 11 is the first surface 103, and an outer surface of the second cavity 12 is the second surface 104. The side surface 105 is the side connecting the first surface 103 and the second surface 104. Among them, in order to be able to distinguish in more detail, the side surface 105 includes a first side 1051, a second side 1052 and a third side 1053. The third side 1053 is the side of the bottom of the shell 10 connecting the first surface 103 and the second surface 104. The first side 1051 and the second side 1052 are respectively arranged on both sides of the third side 1053, and the first side 1051 and the second side 1052 are connected to the sides of the first surface 103 and the second surface 104.

[0084] The first sound outlet 13 and the second sound outlet 14 can be located on the first surface 103 of the product, or on the side surface 105, or on the first surface 103 and the side surface 105, or on the second surface 104, or on the second surface 104 and the side surface 105. The locations of the first sound outlet 13 and the second sound outlet 14 are determined according to the actual needs of the product.

[0085] In other embodiments, the first sound outlet 13 and the second sound outlet 14 are not directly connected to the first cavity 11. Depending on the design requirements, the first sound outlet 13 and the second sound outlet 14 are connected to the first cavity 11 through a first sound guide tube. The first sound guide tube can be formed as a separate tube or through a gap between various components.

[0086] The third sound outlet 15 and the fourth sound outlet 16 can be located on the second surface 104 of the product, or on the side surface 105, or on both the second surface 104 and the side surface 105, or on the first surface 103, or on either the first surface 103 or the side surface 105. The locations of the third sound outlet 15 and the fourth sound outlet 16 are determined based on the actual product requirements.

[0087] During implementation, the first sound outlet hole 13 and the second sound outlet hole 14 radiate positive-phase sound waves with the same phase, and the third sound outlet hole 15 and the fourth sound outlet hole 16 radiate negative-phase sound waves with the same phase.

[0088] As shown in FIG. 10 a , the first sound hole 13 and the second sound hole 14 are both located on the first surface 103 , and the third sound hole 15 and the fourth sound hole 16 are both located on the second surface 104 .

[0089] As shown in FIG10 b , the first sound hole 13 and the second sound hole 14 are both located on the first surface 103 , and the third sound hole 15 and the fourth sound hole 16 are respectively located on the first surface 103 and the second surface 104 .

[0090] As shown in FIG. 10 c , the first sound hole 13 and the second sound hole 14 are both located on the first surface 103 , and the third sound hole 15 and the fourth sound hole 16 are both located on the side surface 105 .

[0091] As shown in FIG10 d , the first sound hole 13 and the second sound hole 14 are both located on the first surface 103 , and the third sound hole 15 and the fourth sound hole 16 are respectively located on the side surface 105 and the second surface 104 .

[0092] As shown in FIG10 e , the first sound hole 13 and the second sound hole 14 are both located on the first surface 103 , and the third sound hole 15 and the fourth sound hole 16 are respectively located on the second surface 104 and the side surface 105 .

[0093] As shown in FIG10 f , the first sound hole 13 and the second sound hole 14 are located on the first surface 103 and the side surface 105 respectively, and the third sound hole 15 and the fourth sound hole 16 are also located on the side surface 105 .

[0094] As shown in FIG. 10 g , the first sound hole 13 is located on the first surface 103 , the second sound hole 14 is located on both the first surface 103 and the side surface 105 , and the third sound hole 15 and the fourth sound hole 16 are located on the side surface 105 .

[0095] As shown in Figure 10h, the first sound hole 13 is located on the first surface 103, the second sound hole 14 is located on both the first surface 103 and the side surface 105, the third sound hole 15 is located on the side surface 105, and the fourth sound hole 16 is located on both the second surface 104 and the side surface 105.

[0096] As shown in FIG10 i , the first sound hole 13 is located on the first surface 103 , the second sound hole 14 is located on both the first surface 103 and the side surface 105 , and the third sound hole 15 and the fourth sound hole 16 are located on both the second surface 104 and the side surface 105 .

[0097] FIG. 10 j shows the angle adjustment scheme of the first sound outlet 13 in FIG. 10 f .

[0098] According to the principle of quadrupole sound source, the closer the sound sources with opposite phases are to each other, the smaller the sound received in the far sound field will be. Taking the appearance of the product into consideration, priority is given to the solution in which the first sound outlet 13 is close to the ear canal opening and the other sound outlets are located on the side of the product. The preferred solutions are Figures 10c, 10f, 10g, and 10j.

[0099] In space, two pairs of dipole sound sources with opposite phases but the same amplitude are close together, forming a transverse quadrupole sound source. In Figures 10a to 10j, the sound waves radiated from the "-" sound outlet are in anti-phase, while the sound waves radiated from the "+" sound outlet are in positive phase.

[0100] In the specific implementation process, by adjusting the array angle and position of the first sound hole 13, the second sound hole 14, the third sound hole 15 and the fourth sound hole 16, such as rotating 90° clockwise with the first sound hole as the center, a solution as shown in Figures 11a to 11j can be obtained.

[0101] In other embodiments, the third sound hole 15 and the fourth sound hole 16 are not directly connected to the second cavity 12 . According to design requirements, the third sound hole 15 and the fourth sound hole 16 are connected to the second cavity 12 through a second sound guide tube.

[0102] In order to minimize sound leakage in the distant sound field of the acoustic quadrupole and achieve the purpose of sound privacy protection, the projections of the first sound outlet 13 and the second sound outlet 14 on a plane perpendicular to the vibration direction of the diaphragm of the speaker unit 20 are the first projection area 131 and the second projection area 141. The center distance between the first projection area 131 and the second projection area 141 is less than or equal to 25 mm, and the first sound outlet 13 and the second sound outlet 14 emit sounds with the same amplitude and phase.

[0103] In some embodiments, the projection of the third sound outlet 15 on a plane perpendicular to the vibration direction of the diaphragm of the speaker unit 20 is a third projection area 151 , and the distance from the center of the first projection area 131 is less than or equal to 15 mm.

[0104] In some embodiments, the projection of the third sound hole 15 on a plane parallel to the vibration direction of the diaphragm of the speaker unit 20 and the projection of the first sound hole 13 on a plane parallel to the vibration direction of the diaphragm of the speaker unit 20 are less than 13 mm in center distance between the two projections.

[0105] In some embodiments, the center distance between the first sound hole 13 and the third sound hole 15 is less than or equal to 16 mm.

[0106] The third sound outlet 15 and the first sound outlet 13 emit sounds with the same amplitude and opposite phases. The first sound outlet 13 is closer to the ear canal than the third sound outlet 15. The distance from the first sound outlet 13 to the ear canal is less than or equal to 15 mm.

[0107] The projection of the fourth sound hole 16 on a plane perpendicular to the vibration direction of the diaphragm of the speaker unit 20 is a fourth projection area 161. The center distance between the third projection area 151 and the fourth projection area 161 is less than or equal to 25 mm, and the third sound hole 15 and the fourth sound hole 16 emit sounds with the same amplitude and phase.

[0108] In some embodiments, a center distance between the fourth projection area 161 and the second projection area 141 is less than or equal to 15 mm.

[0109] In some embodiments, the center distance between the projection of the fourth sound hole 16 on a plane parallel to the vibration direction of the diaphragm of the speaker unit 20 and the projection of the second sound hole 14 on a plane parallel to the vibration direction of the diaphragm of the speaker unit 20 is less than 13 mm.

[0110] In some embodiments, the center distance between the first sound hole 13 and the fourth sound hole 16 is less than or equal to 20 mm.

[0111] In some embodiments, the fourth sound outlet 16 and the second sound outlet 14 emit sounds with the same amplitude and opposite phases.

[0112] In some embodiments, the midpoint of the line connecting the center points of the first projection area 131 and the third projection area 151 is set as the first midpoint, the midpoint of the line connecting the center points of the second projection area 141 and the third projection area 151 is set as the second midpoint, and the distance between the first midpoint and the second midpoint ranges from 7 mm to 25 mm.

[0113] The difference between the distances between the center points of the first projection area 131 , the second projection area 141 , the third projection area 151 and the fourth projection area 161 is less than 15 mm.

[0114] When the audio device is worn, the center of the first sound outlet 13 is farther from the center of the ear canal than the center of the second sound outlet 14. The distance between the center of the first sound outlet 13 and the center of the second sound outlet 14 is less than 15 mm. The second sound outlet 14 is closer to the cymba concha, with the distance between the center of the second sound outlet 14 and the cymba concha being less than or equal to 10 mm. The distance between the second sound outlet 14 and the cymba concha is less than or equal to 10 mm. The third sound outlet 15 is closer to the ear opening than the fourth sound outlet 16.

[0115] The fourth sound hole 16 is opened toward the auricle. In some embodiments, the fourth sound hole 16 is opened toward the lower crus of the antihelix, the antihelix, and the antitragus. The closest distance between the center of the fourth sound hole 16 and the antihelix is ​​between 2-10 mm, the closest distance between the fourth sound hole 16 and the lower crus of the antihelix is ​​between 3-12 mm, and the closest distance to the antitragus is between 2-7 mm, and the angle between the fourth sound hole 16 and the vertical axis of the user is 10° to 35°.

[0116] As shown in Figure 8, the portion of the audio device exposed in front of the auricle is defined as the sound-producing portion 17. The portion between the auricle and the head, which is located behind the auricle, is defined as a hook-shaped band 18, connecting the hook-shaped band 18 to the sound-producing portion 17. To more clearly illustrate the relationship between the audio device and the human ear, an XYZ coordinate system is defined with the ear canal entrance as the origin. As shown in Figure 8, the positive X-axis is oriented outward from the ear canal entrance and is defined as the thickness direction; the positive Z-axis is oriented upward from the ear canal entrance toward the top of the head and is defined as the height direction; and the positive Y-axis is oriented toward the face.

[0117] The hook-shaped band 18 of the audio device is connected to the sound-emitting portion 17 and is worn on the auricle. The sound-emitting portion 17 is located on the front side of the auricle. The sound-emitting portion 17 has a long axis and a short axis that are perpendicular to the vibration direction of the diaphragm of the speaker unit 20. The long axis of the sound-emitting portion 17 is projected onto the YZ plane and forms a certain angle with the Y axis. In some embodiments, this angle is between 15° and 50°. In some further embodiments, this angle is between 35° and 50°.

[0118] As shown in Figures 4 to 8, the audio device has a second side surface 1052 intersecting with the first surface 103, that is, a side shared by the second side surface 1052 and the first surface 103, forming a first edge 1054. The first edge 1054 is higher than the tragus tubercle in the Z-axis direction. This design avoids excessive contact between the audio device and the tubercle on the tragus, thereby avoiding discomfort when worn. The first side surface 1051 and the second side surface 1052 are arranged opposite to each other, forming a tetrahedron-like structure in this embodiment, but are not limited to this structure, and can also be circular, elliptical, etc. The connection between the third side surface 1053 and the first surface 103 forms a second edge 1055. In conjunction with Figure 8, part of the second edge 1055 contacts the intersection area of ​​the upper ear root and the helix.

[0119] The projection of the audio device along the thickness direction (the X-axis in Figure 8 ) covers the cymba concha, the crus helix, part of the cavum concha, and part of the ear canal opening. The third side surface 1053 of the sound-producing portion 17 is arc-shaped along the height direction (the Z-axis in Figure 8 ), with a radius of no less than 6.3 mm. The third side surface 1053 is positioned away from the ear canal opening and closer to the antihelix, with a spacing of no less than 2 mm from the antihelix.

[0120] Figures 8 and 9 illustrate the structure of the first, second, third, and fourth sound holes 13, 14, 15, and 16 of an audio device on the concha of a human ear. First and second sound holes 13, 14 are located on a first surface 103 of a sound-emitting portion 17, as indicated by the dashed racetrack-shaped holes in Figure 8. Third and fourth sound holes 15, 16 are located on a second surface 104 of a sound-emitting portion 17, as indicated by the solid square holes in Figure 8.

[0121] The long axes of the first sound outlet hole 13 and the second sound outlet hole 14 form an angle of 0-150° with the plane where the short axis of the audio device is located. In FIG. 8 of this embodiment, the angle is 0°.

[0122] In some embodiments, the ratio of the length of the first sound outlet hole 13 and the second sound outlet hole 14 in the long axis direction to the length of the short axis direction is greater than 2.5.

[0123] The third sound outlet hole 15 and the fourth sound outlet hole 16 are farther away from the ear canal opening than the first sound outlet hole 13 , and the distance from the third sound outlet hole 15 and the fourth sound outlet hole 16 to the ear canal opening is 20 mm to 35 mm.

[0124] In some embodiments, the fourth sound outlet 16 is located on the side surface 105 and faces the auricle. The fourth sound outlet 16 faces the area where the crus of the antihelix and the antihelix are located.

[0125] In some embodiments, the closest distance between the center of the fourth sound hole 16 and the antihelix is ​​2 mm to 10 mm; the closest distance between the fourth sound hole 16 and the lower crus of the antihelix is ​​3 mm to 12 mm. When worn by a user, the angle between the fourth sound hole 16 and the vertical axis ranges from 10° to 35°.

[0126] In some embodiments, the third sound hole 15 is located on the side surface 105 and faces the anti-tragus. The closest distance between the center of the third sound hole 15 and the anti-tragus is 2 to 12 mm. When worn by a user, the angle between the third sound hole 15 and the vertical axis ranges from 10° to 35°.

[0127] The ratio of the length of the first sound outlet hole 13 and the second sound outlet hole 14 along the long axis to the length of the audio device along the long axis is not less than 0.618.

[0128] Compared to the first sound hole 13, the third sound hole 15 and the fourth sound hole 16 are further away from the ear canal opening, with the distance being 20-35 mm. In some embodiments, the fourth sound hole 16 is located on the side surface 105, with the opening facing the auricle. In some further embodiments, the opening of the fourth sound hole 16 faces the lower crus of the antihelix and the area below the antihelix. The closest distance between the center of the fourth sound hole 16 and the antihelix is ​​2 mm to 10 mm. The closest distance between the fourth sound hole 16 and the lower crus of the antihelix is ​​3 mm to 12 mm, and the angle between the fourth sound hole 16 and the vertical axis of the user ranges from 10° to 35°.

[0129] In some embodiments, the third sound outlet 15 is located on the side surface 105 and faces the anti-tragus. The closest distance between the center of the third sound outlet 15 and the anti-tragus is 2 to 12 mm, and the angle between the center of the third sound outlet 15 and the vertical axis of the user is in the range of 10° to 35°.

[0130] As shown in Figure 12, a raised structure 106 is provided on the first surface 103 of the audio device, facing the cavum concha. The first sound outlet 13 and the second sound outlet 14 are disposed on the raised structure 106. Raised structure 106 is higher than the first surface 103. In some embodiments, the height of raised structure 106 above the first surface 103 is 0.5 mm to 3 mm. The raised structure 106 where the first sound outlet 13 is located is higher relative to the first surface 103 than the raised structure 106 where the second sound outlet 14 is located, by at least 0.5 mm. This means that the height of raised structure 106 is tailored to the structure of the audio device and the ear, allowing more sound to reach the ear canal.

[0131] As shown in Figures 8 and 9, when worn normally, the line connecting the centers of the first sound outlet 13 and the second sound outlet 14 of the audio device forms an angle with the YZ plane of the coordinate system above, which is 25° to 70°; forms an angle with the XY plane, which is less than or equal to 150°; and forms an angle with the XZ plane, which is less than or equal to 150°.

[0132] In other embodiments, when worn normally, the angle between the plane perpendicular to the average normal line of the first sound outlet hole 13 and the YZ plane is less than or equal to 40°.

[0133] In other embodiments, the angle formed by the line connecting the centers of the first sound outlet 13 and the second sound outlet 14 and the plane formed by the base of the ear, the antihelix and the notch between the tragus and the ear is less than or equal to 35°.

[0134] In other embodiments, the angle between a plane perpendicular to the average normal of the first sound outlet 13 and a plane formed by the ear root, the antihelix, and the notch between the tragus and the ear is less than or equal to 35°.

[0135] The center line of the third sound outlet 15 and the fourth sound outlet 16 forms an angle with the ZY plane that is less than or equal to 70°; forms an angle with the XY plane that is less than or equal to 150°; and forms an angle with the XZ plane that is less than or equal to 130°.

[0136] The angle between the plane perpendicular to the average normal of the third sound outlet hole 15 and the YZ plane is less than or equal to 82°.

[0137] The angle between the center line of the third sound outlet 15 and the center line of the fourth sound outlet 16 and the plane formed by the ear root, the antihelix and the notch between the tragus and the ear is less than or equal to 35 degrees.

[0138] The angle between a plane perpendicular to the average normal of the first sound outlet 13 and a plane formed by the ear root, the antihelix and the notch between the tragus and the ear is less than or equal to 65°.

[0139] The fourth sound outlet 16 faces the anti-helix and is approximately 5 mm away from the anti-helix when worn. To minimize standing waves between the fourth sound outlet 16 and the anti-helix, the ratio of the length of the fourth sound outlet 16 to the height of the first surface 103 of the audio device is greater than 0.6.

[0140] In some embodiments, the length-to-width ratio of the fourth sound outlet 16 is not less than 2.5.

[0141] To illustrate the relationship between the sound holes, an XYZ coordinate system is used for illustration. The projection area of ​​the sound holes on the YZ plane is shown in Figure 9. The distance between the projection centers of the first sound hole 13 and the third sound hole 15 on the YZ plane is 3 to 7 mm, and in some embodiments, 4 mm; the distance between the projection centers of the first sound hole 13 and the second sound hole 14 on the YZ plane is 4 to 8 mm, and in some embodiments, 6 mm; the distance between the projection centers of the second sound hole 14 and the fourth sound hole 16 on the YZ plane is 4 to 8 mm, and in some embodiments, 6 mm. When the audio device is worn, as shown in Figure 8, the fourth sound hole 16 faces the inferior crus of the antihelix. In some embodiments, the angle between the direction of the fourth sound hole 16 toward the inferior crus of the antihelix and the above-mentioned Z axis is 5° to 30°.

[0142] Due to the structure of the audio device, the first, second, third, and fourth sound holes 13, 14, 15, and 16 must closely resemble a quadrupole sound source in three dimensions to effectively prevent sound leakage. To optimize the spatial layout and further enhance sound leakage prevention, the sound source formed by the four sound holes is spatially arranged to resemble a transverse quadrupole sound source.

[0143] Referring to Figures 4 to 9 , schematic diagrams illustrate the structure of the first, second, third, and fourth sound holes 13, 14, 15, and 16 of the audio device on the auricle of the human ear. The first and second sound holes 13, 14 are located on the first surface 103 of the sound-emitting portion 17. The two dashed runway-shaped holes in Figure 8 represent the first and second sound holes 13, 14, respectively. The third and fourth sound holes 15, 16 are located on the first and second side surfaces 1051, 1052, respectively. The two solid square-shaped holes in Figure 8 represent the third and fourth sound holes 15, 16, respectively. The long axes of the first and second sound holes 13, 14 form an angle of 0° to 120° with the plane of the short axis of the audio device, with the angle shown as 0°.

[0144] In some embodiments, a vertical distance between the center of the fourth sound hole 16 and the first edge 1054 is less than or equal to 10 mm, and a vertical distance between the center of the third sound hole 15 and the second edge 1055 is less than or equal to 10 mm.

[0145] In some embodiments, the angle formed by the line connecting the centers of the first sound hole 13 and the second sound hole 14 with the YZ plane is between 25° and 70°; the angle formed with the XY plane is less than or equal to 150°; and the angle formed with the XZ plane is less than or equal to 150°.

[0146] In some embodiments, an angle between a plane perpendicular to the average normal of the first sound outlet hole 13 and the YZ plane is less than or equal to 40°.

[0147] In some embodiments, the angle between the center line of the first sound outlet 13 and the center line of the sound outlet 2 and the plane formed by the ear root, the antihelix and the notch between the tragus is less than or equal to 35°.

[0148] In some embodiments, an angle between a plane perpendicular to the average normal of the first sound outlet 13 and a plane formed by the ear root, the antihelix, and the intertragus notch on the ear is less than or equal to 35°.

[0149] In some embodiments, the angle formed by the line connecting the centers of the third sound hole 15 and the fourth sound hole 16 with the ZY plane is less than or equal to 40°; the angle formed with the XY plane is less than or equal to 150°; and the angle formed with the XZ plane is less than or equal to 150°.

[0150] In some embodiments, the angle between the center line of the third sound outlet 15 and the fourth sound outlet 16, a plane perpendicular to the average normal of the third sound outlet 15, and the YZ plane is less than or equal to 82°. The angle between the center line of the third sound outlet 15 and the fourth sound outlet 16 and the plane formed by the base of the ear, the antihelix, and the tragus is less than or equal to 35°.

[0151] In some embodiments, the angle between a plane connecting the centers of the third sound outlet 15 and the fourth sound outlet 16, a plane perpendicular to the average normal of the first sound outlet 13, and a plane formed by the notch between the ear root, the antihelix, and the tragus on the ear is less than or equal to 65°.

[0152] The fourth sound outlet 16 is partially located near the anti-helix and partially located near the inferior crus of the helix, with a distance of 3 mm from the anti-helix. To reduce standing waves between the fourth sound outlet 16 and the anti-helix, the ratio of the length of the fourth sound outlet 16 to the height of the first surface 103 of the audio device is greater than 0.6; alternatively, the ratio of the length of the fourth sound outlet 16 to the length of the first surface 103 of the audio device is greater than 0.6.

[0153] In some embodiments, the length-to-width ratio of the sound outlet of the second cavity 12 is not less than 2.5.

[0154] To illustrate the relationship between the sound holes, the XYZ coordinate system mentioned above is used for explanation.

[0155] The projected center distance between the first and third sound holes 13, 15 on the YZ plane is 4 mm. The projected center distance between the first and second sound holes 13, 14 on the YZ plane is 4 mm. The projected center distance between the second and fourth sound holes 14, 16 on the YZ plane is 4 mm.

[0156] The line connecting the projection centers of the third sound hole 15 and the fourth sound hole 16 on the YZ plane intersects with the line connecting the projection centers of the first sound hole 13 and the second sound hole 14 on the YZ plane, and forms a certain angle, which is not greater than 90°.

[0157] The distance between the projection centers of the first sound hole 13 and the third sound hole 15 on the XY plane is 6 mm, the distance between the projection centers of the second sound hole 14 and the fourth sound hole 16 on the XY plane is 6 mm, and the distance between the projection centers of the first sound hole 13 and the second sound hole 14 on the XY plane is 3 mm.

[0158] The line connecting the centers of the first and third sound outlet holes 13, 15 passes through the first diaphragm 21 of the speaker unit 20 and forms an angle of less than or equal to 80°, and in some embodiments, less than or equal to 45°, with a plane perpendicular to the vibration direction of the speaker unit 20. The angle between the line connecting the centers of the first and third sound outlet holes 13, 15, and a reference plane perpendicular to the average normal of the first sound outlet hole 13 is between 15° and 65°.

[0159] The line connecting the centers of the second sound outlet 14 and the fourth sound outlet 16 passes through the first diaphragm 21 of the speaker unit 20 and forms an angle of less than or equal to 80°, and in some embodiments, less than or equal to 45°, with a plane perpendicular to the vibration direction of the speaker unit 20. The angle between the line connecting the centers of the second sound outlet 14 and the fourth sound outlet 16 and a reference plane perpendicular to the average normal of the second sound outlet 14 is between 15° and 65°.

[0160] The fourth sound outlet 16 faces the helix and the lower crus of the helix, and in some embodiments faces the anti-helix, and the angle between the opening direction and the vertical axis of the user is 5° to 30°.

[0161] Based on the above scheme, in the process of optimizing the spatial position of the quadrupole sound source, the positions of the sound holes can be adjusted as shown in Figures 10 and 11. The positions of the first sound hole 13, the second sound hole 14, the third sound hole 15, and the fourth sound hole 16 can be designed according to actual design requirements.

[0162] The audio device is internally provided with one or more speaker units 20. When the diaphragm of the speaker unit 20 vibrates, sound signals with the same amplitude and opposite phases are emitted in front of and behind the diaphragm.

[0163] The specific structure and installation method of the speaker unit 20 are as follows:

[0164] In this embodiment, as shown in Figures 8 and 13 , a speaker unit 20 is disposed within the sound-emitting portion 17. The speaker unit 20 includes a first diaphragm 21, a second diaphragm 22, a voice coil, and a magnetic circuit assembly 26. The projection of the major axis of the speaker unit 20 on the XY plane is greater than or equal to the projection of the minor axis of the speaker unit 20 on the XZ plane.

[0165] The first diaphragm 21 is bonded to the first voice coil 25. When an AC signal is applied to the first voice coil 25, the first voice coil 25 drives the first diaphragm 21 to vibrate under the drive of the magnetic circuit assembly 26. The first diaphragm 21 is closer to the ear opening than the second diaphragm 22.

[0166] The first diaphragm 21 and the inner wall of the first surface 103 and / or the inner wall of the side surface 105 of the sound-emitting portion 17 form a first cavity 11. The sound signal generated by the first diaphragm 21 is emitted as two sound signals with the same amplitude and phase through the first sound outlet 13 and the second sound outlet 14 of the first cavity 11. The second diaphragm 22 is bonded to the housing 10 of the speaker unit 20 and forms a completely sealed space with the housing 10 of the speaker unit 20 and the first diaphragm 21. This space becomes the third cavity 28, wherein the voice coil, magnetic circuit assembly 26 and other components are arranged in the third cavity 28. In addition, the volume of the third cavity 28 is less than or equal to 8 cm 3 .

[0167] In this embodiment, as shown in FIG13 , the second diaphragm 22 is a diaphragm of the speaker unit 20 and is not connected to the first voice coil 25. However, driven by the first diaphragm 21, the second diaphragm 22 vibrates in the same direction as the first diaphragm 21. This same-direction vibration is manifested as follows: when the first diaphragm 21 vibrates away from the magnetic circuit assembly 26, the second diaphragm 22 vibrates toward the magnetic circuit assembly 26; conversely, when the first diaphragm 21 vibrates toward the magnetic circuit assembly 26, the second diaphragm 22 vibrates away from the magnetic circuit assembly 26.

[0168] The second diaphragm 22 and the inner wall and side wall of the second surface 104 of the sound-emitting part 17 form a second cavity 12. The sound signal generated by the second diaphragm 22 is emitted through the third sound outlet 15 (not indicated in the figure) and the fourth sound outlet 16 of the second cavity 12, and the sound amplitude and phase of the two holes are the same.

[0169] By adjusting the volume of the first cavity 11, the areas of the first sound hole 13 and the second sound hole 14, and the opening rate of the mesh attached to the above-mentioned sound holes, the first sound hole 13 and the third sound hole 15 can emit sounds with the same amplitude and opposite phases.

[0170] Similarly, by adjusting the volume of the second cavity 12, the areas of the third sound hole 15 and the fourth sound hole 16, and the opening ratio of the mesh attached to the above sound holes, the second sound hole 14 and the fourth sound hole 16 can emit sounds with the same amplitude and opposite phases.

[0171] The area of ​​the first sound hole 13, the second sound hole 14, the third sound hole 15 and the fourth sound hole 16 is not less than 4mm 2 When the opening area is small, it will lead to the radiation ability of low frequencies in the audio device.

[0172] In some embodiments, the area of ​​the first sound outlet hole 13 is 0.4 to 2.5 times the area of ​​the second sound outlet hole 14 .

[0173] In some embodiments, the area of ​​the third sound outlet hole 15 is 0.4 to 2.5 times the area of ​​the fourth sound outlet hole 16 .

[0174] In some embodiments, the area of ​​the first sound outlet hole 13 is 0.4 to 2.5 times the area of ​​the third sound outlet hole 15 .

[0175] In some embodiments, the area of ​​the second sound outlet 14 is 0.4 to 2.5 times the area of ​​the fourth sound outlet 16 .

[0176] In some embodiments, a tuning mesh may be attached to the first sound hole 13, the second sound hole 14, the third sound hole 15, and the fourth sound hole 16, and the acoustic resistance formed by the sound hole and the acoustic mesh is less than or equal to 9*109 Pa·s / m 3 .

[0177] In some embodiments, the volume of the first cavity 11 and the second cavity 12 are both greater than 0.8 cm 3 .

[0178] In some embodiments, the volume of the first cavity 11 may be 0.4 to 6 times the volume of the second cavity 12 .

[0179] In some embodiments, the inner surface of the first cavity 11 is less than or equal to 3 mm away from the diaphragm of the speaker unit 20 in the vibration direction of the speaker unit 20 .

[0180] As shown in Figure 13, the first diaphragm 21 and the second diaphragm 22 both include a folding ring 211 and a vibrating portion 212. The vibrating portion 212 is the vibration position of the first diaphragm 21, which is used to vibrate and make sounds, and is generally the middle part of the first diaphragm 21. The folding ring 211 is the transition part between the edge of the first diaphragm 21 and the vibrating portion 212. The folding ring 211 is generally a convex or concave inclined or arc structure, and is circumferentially arranged along the vibrating portion 212 of the first diaphragm 21. One side of the vibrating portion 212 is fixedly connected to the first voice coil 25, so that when a signal is passed through the first voice coil 25, the voice coil moves under the action of the magnetic circuit assembly 26, thereby causing the first diaphragm 21 to vibrate and make sounds.

[0181] In some embodiments, both the first diaphragm 21 and the second diaphragm 22 further include a fixing portion. The fixing portion is disposed on the outer edge of the surround 211 and is used to secure the speaker unit 20 or the housing 10. During vibration of the first diaphragm 21, after the fixing portion is secured, the vibrating portion 212 and the surround 211 are suspended. Therefore, the vibrating portion 212 moves under the action of the first voice coil 25, and the vibration amplitude and frequency are closely related to the surround 211.

[0182] As shown in Figure 13, the first diaphragm 21 and the first voice coil 25 constitute a first vibration system, with a resonant frequency of F1. The second diaphragm 22 has a similar structure to the first diaphragm 21. However, in this embodiment, the vibrating portion of the second diaphragm 22 is not connected to the first voice coil 25. Instead, the vibration of the second diaphragm 22 is driven by the first diaphragm 21, causing the second diaphragm 22 to vibrate. Therefore, the second diaphragm 22 constitutes a second vibration system, with a resonant frequency of F2. Research has shown that in order to achieve sound with equal amplitude and opposite phases from the first and second diaphragms 21 and 22, control of the first and second vibration systems is necessary.

[0183] The resonant frequency of a vibration system is influenced by its mass, elasticity, and internal damping. The mass of the vibration system is affected by components such as the surround 211, the vibrating portion 212, and the first voice coil 25. Elasticity is influenced by the material, thickness, and width of the surround 211, as well as the space enclosed by the first and second diaphragms 21 and 22. Internal damping is affected by the material of the surround 211. The vibration system's ability to radiate sound is affected by the displacement and area of ​​the diaphragms.

[0184] The resonant frequency F1 of the first vibration system is close to the resonant frequency F2 of the second vibration system. In some embodiments, the ratio of F1 to F2 is in the range of 0.7 to 1.3.

[0185] The rim 211 of the second diaphragm 22 has a smaller elastic force than the rim 211 of the first diaphragm 21. In some embodiments, the ratio of the thickness of the rim 211 of the second diaphragm 22 to the thickness of the rim 211 of the first diaphragm 21 is in a range of 0.88 to 2.2.

[0186] In some embodiments, the folding ring 211 can be made of materials such as PU and liquid silicone.

[0187] In some embodiments, the mass of the second vibration system is 0.1-2.2 times the mass of the first vibration system.

[0188] In some embodiments, the internal damping of the second diaphragm 22 is 1.2-5 times the internal damping of the first diaphragm 21 .

[0189] In some embodiments, the area of ​​the second diaphragm 22 is 0.8-2 times the area of ​​the first diaphragm 21 .

[0190] In some embodiments, the distance between the first sound hole 13 and the center of the first diaphragm 21 is 0.3-0.8 times the distance between the second sound hole 14 and the center of the first diaphragm 21.

[0191] In some embodiments, the distance between the third sound hole 15 and the center of the second diaphragm 22 is 0.3-0.8 times the distance between the fourth sound hole 16 and the center of the second diaphragm 22 .

[0192] In another embodiment, as shown in Figures 8 and 14. In this embodiment, the first vibration system includes a first diaphragm 21 and a first voice coil 25, and the second vibration system includes a second diaphragm 22 and a second voice coil 27. The second diaphragm 22 is sealed and fixed to the outer shell of the speaker unit 20, and the second voice coil 27 is fixed on one side of the second diaphragm 22. The first voice coil 25 and the second voice coil 27 are electrically connected in series. When the speaker unit 20 is working, when the same audio signal flows through the first voice coil 25 and the second voice coil 27, the first vibration system and the second vibration system vibrate in the same direction. At this time, the first diaphragm 21 and the second diaphragm 22 emit sounds with the same amplitude and opposite phases. The first diaphragm 21 and the second diaphragm 22 form a sealed space with the outer shell of the speaker unit 20. The magnetic circuit assembly 26, the first voice coil 25, the second voice coil 27 and other components of the speaker unit 20 are sealed in this space. The space is less than or equal to 8cm 3 There are two magnetic circuit components 26, namely a first magnetic circuit 261 and a second magnetic circuit 262. In some embodiments, the space is less than or equal to 2 cm 3 .

[0193] The magnetic field of the magnetic circuit assembly 26 has the same effect on the first voice coil 25 and the second voice coil 27. When a signal is applied to the first voice coil 25 and the second voice coil 27, the current in the first voice coil 25 and the second voice coil 27 is affected by the magnetic field of the magnetic circuit assembly 26, causing the first voice coil 25 and the second voice coil 27 to move back and forth. In turn, the first voice coil 25 and the second voice coil 27 drive the first diaphragm 21 and the second diaphragm 22 to move in the same direction, producing sound.

[0194] The first vibration system and the second vibration system have similar resonant frequencies. In some embodiments, the ratio of the resonant frequencies is 0.9-1.1.

[0195] The fold 211 of the second diaphragm 22 has smaller elasticity than the fold 211 of the first diaphragm 21 . In some embodiments, the thickness ratio of the fold 211 of the second diaphragm 22 to the fold 211 of the first diaphragm 21 is in the range of 0.88-1.2 times.

[0196] In some embodiments, the mass of the second vibration system is 0.1-2.2 times the mass of the first vibration system, the internal damping of the second diaphragm 22 is 1.2-1.8 times the internal damping of the first diaphragm 21, and the area of ​​the second diaphragm 22 is 0.8-2 times the area of ​​the first diaphragm 21.

[0197] In some embodiments, the distance between the first sound outlet 13 and the center of the first diaphragm 21 is 0.3-0.8 times the distance between the second sound outlet 14 and the center of the first diaphragm 21 .

[0198] In some embodiments, the distance between the third sound hole 15 and the center of the second diaphragm 22 is 0.3-0.8 times the distance between the fourth sound hole 16 and the center of the second diaphragm 22 .

[0199] In another embodiment, as shown in Figures 8 and 15. In this embodiment, the implementation principle is similar to the embodiment of Figure 13. The second diaphragm 22 is a passive diaphragm, but is designed separately from the speaker unit 20. The second diaphragm 22 is fixedly connected to the shell 10. The second diaphragm 22 is located on one side of the magnetic circuit component 26, between the magnetic circuit component 26 and the inner wall of the second surface 104. The second diaphragm 22 is fixed to the shell 10 of the audio device by sealing with glue. The first diaphragm 21 is the diaphragm of the speaker unit 20 itself, and is located on the side opposite to the second diaphragm 22. The speaker unit 20 is sealed and fixed to the shell 10 of the audio device, so that the first cavity 11 and the second cavity 12 are isolated from each other.

[0200] The first diaphragm 21 is a diaphragm inherent to the speaker unit 20 , and the second diaphragm 22 is a separate diaphragm that forms a dual-diaphragm structure with the first diaphragm 21 .

[0201] The first diaphragm 21 and the second diaphragm 22 of the speaker unit 20 and the housing 10 of the audio device form a third cavity 28 (the third cavity 28 is less than or equal to 18 cm). 3 In some embodiments, the sealed space is 3 cm 3 ), sealing the voice coil, magnetic circuit assembly 26, and other components of the speaker unit 20 to prevent external interference. When the first diaphragm 21 vibrates forward, that is, away from the magnetic circuit assembly 26, the second diaphragm 22 vibrates toward the magnetic circuit assembly 26. When the first diaphragm 21 vibrates backward, that is, toward the magnetic circuit assembly 26, the second diaphragm 22 vibrates away from the magnetic circuit assembly 26. The first and second diaphragms 21, 22 vibrate in the same direction, producing sounds with the same amplitude but opposite phases.

[0202] The first vibration system and the second vibration system have similar resonant frequencies. In some embodiments, the ratio of the resonant frequencies is between 0.7 and 1.3 times.

[0203] The rim 211 of the second diaphragm 22 has smaller elasticity than the rim 211 of the first diaphragm 21 . In some embodiments, the thickness ratio of the rim 211 of the second diaphragm 22 to the rim 211 of the first diaphragm 21 is 0.88-2.2 times.

[0204] In some embodiments, the folding ring 211 is made of materials such as PU and liquid silicone.

[0205] In some embodiments, the mass of the second vibration system is 0.1-2.2 times the mass of the first vibration system.

[0206] In some embodiments, the internal damping of the second diaphragm 22 is 1.2-5 times the internal damping of the first diaphragm 21 .

[0207] In some embodiments, the area of ​​the second diaphragm 22 is 0.8-2 times the area of ​​the first diaphragm 21 .

[0208] In some embodiments, the distance between the first sound outlet 13 and the center of the first diaphragm 21 is 0.3-0.8 times the distance between the second sound outlet 14 and the center of the first diaphragm 21 .

[0209] In some embodiments, the distance between the third sound hole 15 and the center of the second diaphragm 22 is 0.3-0.8 times the distance between the fourth sound hole 16 and the center of the second diaphragm 22 .

[0210] In another embodiment, as shown in Figures 8 and 16, the second diaphragm 22 in the previous embodiment is removed, and the first diaphragm 21 is formed by the diaphragm inherent in the speaker unit 20 itself. In this embodiment, the front side of the speaker unit 20 is opposite to the first cavity 11, and the rear end of the speaker unit 20 is opposite to the second cavity 12. The first cavity 11 and the second cavity 12 are isolated from each other. The first sound hole 13 and the second sound hole 14 are connected to the first cavity 11, and the third sound hole 15 (not marked in the figure) and the fourth sound hole 16 are connected to the second cavity 12. The first sound hole 13 and the second sound hole 14 are arranged on the first surface 103, and the third sound hole 15 and the fourth sound hole 16 are arranged on the second surface 104 or the side surface 105.

[0211] The diaphragm of speaker unit 20 (i.e., first diaphragm 21) is positioned on one side of first mounting surface 101, and the rear side of speaker unit 20 is positioned on one side of second mounting surface 102. The magnetic circuit of speaker unit 20 itself comprises magnetic circuit assembly 26. The spatial relationship between the sound hole size, the size of the sound hole and the diaphragm, and other aspects described in the previous embodiment can also be used to construct a quadrupole sound source in the audio device of this embodiment, and the same techniques are applicable.

[0212] In another embodiment, referring to the embodiment of Figure 14, the speaker unit 20 is replaced with two speakers 201 and 202 with only one diaphragm, as shown in Figure 17. The first speaker 201 and the second speaker 202 are installed back to back to each other, and the diaphragm of the first speaker 201 is arranged facing the first cavity 11, and the diaphragm of the second speaker 202 is arranged facing the second cavity 12. The sound emitted by the diaphragm of the first speaker 201 and the sound emitted by the diaphragm of the second speaker 202 have the same amplitude and opposite phase. Among them, the diaphragm of the first speaker 201 is the first diaphragm 21, and the diaphragm of the second speaker 202 is the second diaphragm 22. The sound holes of the first cavity 11 are the first sound hole 13 and the second sound hole 14, and the sound holes of the second cavity 12 are the second sound hole 15 and the fourth sound hole 16.

[0213] In another embodiment, as shown in FIG18 , the speaker unit 20 includes a first speaker 201, a second speaker 202, a third speaker 203, and a fourth speaker 204, each of which includes a diaphragm. The diaphragms corresponding to the first speaker 201, the second speaker 202, the third speaker 203, and the fourth speaker 204 are a first diaphragm 21, a second diaphragm 22, a third diaphragm 23, and a fourth diaphragm 24.

[0214] In terms of space, the first diaphragm 21 , the second diaphragm 22 , the third diaphragm 23 and the fourth diaphragm 24 may be back to back, side by side, or side by side on the same side.

[0215] Each sound outlet can emit sound signals by radiating them outward from an independent diaphragm. The first diaphragm 21 emits sound to the outside world through the first sound outlet 13, coupled to the first cavity 11. The second diaphragm 22 emits sound signals to the outside world through the third sound outlet 15, coupled to the second cavity 12. The third diaphragm 23 emits sound signals to the outside world through the second sound outlet 14, coupled to the seventh cavity 30. The fourth diaphragm 24 emits sound signals to the outside world through the fourth cavity 29, coupled to the fourth sound outlet 16.

[0216] The first diaphragm 21 and the second diaphragm 22 form a sealed space with the outer wall of the speaker unit 20 or the inner wall of the housing 10, referred to as the fifth cavity 281. The magnetic circuit components, voice coils, and other components of the first and second speakers 201, 202 are sealed within the fifth cavity 281. The first and second diaphragms 21, 22 can be driven as a pair, vibrating in the same direction, and can produce sounds with the same amplitude and opposite phases.

[0217] The third and fourth diaphragms 23, 24, and the outer walls of the third and fourth speakers 203, 204, or the inner walls of the housing 10, form a sealed space, referred to as the sixth cavity 291. The magnetic circuit components, voice coils, and other components of the third and fourth speakers 203, 204 are enclosed within this sealed space. The third and fourth diaphragms 23, 24 can be driven as a pair, vibrating in the same direction, to produce sounds with the same amplitude and opposite phases.

[0218] The first diaphragm 21 and the third diaphragm 23 emit sounds with the same amplitude and phase; similarly, the second diaphragm 22 and the fourth diaphragm 24 emit sounds with the same amplitude and phase. The sound emitted by the diaphragms radiates outward through the four cavities and sound holes. The sound hole 13 of the first cavity 11 and the sound hole 15 of the second cavity 12 are analogous to the first sound hole 13 and the third sound hole 15 mentioned above. The sounds emitted by them constitute a pair of quasi-dipole sound sources. The sound hole 14 of the third cavity 30 and the sound hole 16 of the fourth cavity 29 are analogous to the second sound hole 14 and the fourth sound hole 16 mentioned above. The sounds emitted by them constitute a pair of quasi-dipole sound sources. The two pairs of quasi-dipole sound sources constitute a quasi-quadrupole sound source. The parameters such as the sound hole size, position, and angle mentioned above are also applicable in this case.

[0219] In FIG18 , the first diaphragm 21 and the second diaphragm 22 form a first cavity 11 and a second cavity 12 through the speaker bracket and the housing 10 , and the first diaphragm 21 and the second diaphragm 22 form a sealed fifth cavity 281 through the speaker bracket and the housing 10 ;

[0220] The back side of the first diaphragm 21, i.e., the side closest to the magnet, is connected to the fifth cavity 281 through a sound outlet hole on the speaker bracket. The back side of the second diaphragm 22, i.e., the side closest to the magnet, is connected to the fifth cavity 281 through a sound outlet hole on the speaker bracket. The first and second diaphragms 21, 22 can be driven in pairs to emit sounds with the same amplitude but opposite phases.

[0221] The third diaphragm 23 and the fourth diaphragm 24 form a seventh cavity 30 and a fourth cavity 29 through the speaker bracket and the housing 10. The third diaphragm 23 and the fourth diaphragm 24 form a sealed sixth cavity 291 through the speaker bracket and the housing 10.

[0222] The back side of the third diaphragm 23, i.e., the side closest to the magnet, is connected to the sixth cavity 291 through a sound outlet hole on the speaker bracket. The back side of the fourth diaphragm 24, i.e., the side closest to the magnet, is connected to the sixth cavity 291 through a sound outlet hole on the speaker bracket. The third and fourth diaphragms 23, 24 can be driven in pairs to emit sounds with the same amplitude but opposite phases.

[0223] As mentioned above, the volume of the fifth cavity 281 and the sixth cavity 291 cannot be too large, and in some embodiments, it is less than or equal to 8 cm 3 , more preferably, less than or equal to 3cm 3 .

[0224] In order to achieve a good acoustic quadrupole effect, the vibration systems of the first speaker 201, the second speaker 202, the third speaker 203, and the fourth speaker 204 have close resonance frequencies.

[0225] The speaker unit 20 or the passive diaphragm provides a vibration system, the first vibration system is provided by the first speaker unit 201 , the second vibration system is provided by the second speaker unit 202 , the third vibration system is provided by the third speaker unit 203 , and the fourth vibration system is provided by the fourth speaker unit 204 .

[0226] The first vibration system and the second vibration system have close resonant frequencies. Specifically, the ratio of the resonant frequencies is 0.7-1.3.

[0227] The third vibration system and the fourth vibration system have close resonant frequencies. Specifically, the ratio of the resonant frequencies is 0.7-1.3.

[0228] The second vibration system and the fourth vibration system have close resonant frequencies. Specifically, the ratio of the resonant frequencies is 0.7-1.3.

[0229] The rim 211 of the third diaphragm 23 has a similar compliance to that of the rim 211 of the first diaphragm 21. Specifically, the ratio of the thickness of the rim 211 of the third diaphragm 23 to that of the first diaphragm 21 is 0.88-2.2.

[0230] Specifically, the folding ring 211 is made of materials such as PU and liquid silicone.

[0231] Preferably, the mass of the fourth vibration system is 0.1-2.2 times the mass of the second vibration system

[0232] Preferably, the internal damping of the fourth diaphragm 24 is 0.5-5 times the internal damping of the second diaphragm 22 .

[0233] Preferably, the area of ​​the fourth diaphragm 24 is 0.8-2 times the area of ​​the second diaphragm 22 .

[0234] The rim 211 of the second diaphragm 22 has a similar compliance to that of the rim 211 of the first diaphragm 21 . Preferably, the ratio of the thickness of the rim 211 of the second diaphragm 22 to the thickness of the rim 211 of the first diaphragm 21 is 0.9-1.1.

[0235] Specifically, the folding ring 211 is made of materials such as PU and liquid silicone.

[0236] Specifically, the mass of the second vibration system is 1.05-1.2 times the mass of the first vibration system.

[0237] Specifically, the internal damping of the third diaphragm 23 is 0.9-1.1 times the internal damping of the first diaphragm 21 .

[0238] Specifically, the area of ​​the second diaphragm 22 is similar to the area of ​​the first diaphragm 21 .

[0239] In this embodiment, the relevant parameters of the first cavity 11 and its sound hole 13, the seventh cavity 30 and its sound hole 14, the second cavity 12 and its sound hole 15, and the fourth cavity 24 and its sound hole 16 are the same as those of the embodiment described in Figure 14 above and will not be repeated.

[0240] In some embodiments, referring to the embodiment of Figure 18, it is easy to imagine replacing the second speaker 203 and the fourth speaker 204 with a passive diaphragm. The passive diaphragm can be fixed to the housing of the audio device by gluing and sealing, and the effect in the embodiment of Figure 18 can be achieved by adjusting the mass, compliance and internal damping of the passive diaphragm.

[0241] Another embodiment, as shown in FIG19 , refers to the embodiment described in FIG19 , and through design, the two speakers can be replaced with a single speaker with dual magnetic circuits and dual diaphragms. Specifically, the speaker unit 20 includes two speakers with two diaphragms. The speaker unit 20 includes a first speaker 201 and a second speaker 202; wherein the first speaker 201 has a first diaphragm 21 and a second diaphragm 22, and the second speaker 202 has a third diaphragm 23 and a fourth diaphragm 24. The first diaphragm 21 and the second diaphragm 22 form a sealed space 281 with the bracket of the first speaker 201, and the magnetic circuit system is located in the sealed space. The third diaphragm 223 and the fourth diaphragm 24 form a sealed space 291 with the second speaker 202, and the magnetic circuit system is located in the sealed space.

[0242] The volume of the sealed space is less than or equal to 8 cm 3 , preferably less than or equal to 3cm 3 .

[0243] The first vibration system is provided by the first diaphragm 21 and its attached voice coil, the second vibration system is provided by the second diaphragm 22 and its attached voice coil, the third vibration system is provided by the third diaphragm 23 and its attached voice coil, and the fourth vibration system is provided by the fourth diaphragm 24 and its attached voice coil. The relevant vibration system technology is similar to that of the embodiment described in FIG19 and will not be elaborated here.

[0244] In this embodiment, the parameters of the first cavity 11 and its sound outlet 13, the second cavity 12 and its sound outlet 15, the seventh cavity 30 and its sound outlet 14, the fourth cavity 24 and its sound outlet 16, the fifth cavity 281, and the sixth cavity 291 are the same as those described in the embodiment of FIG14 above and will not be repeated here. The implementation of the acoustic quadrupole in the above scheme significantly improves both far-field sound leakage and near-field listening compared to acoustic dipoles.

[0245] As shown in FIG20 , the quadrupole has better audio reproduction and sound leakage prevention effects than the dipole.

[0246] Figure 21 shows a comparison of sound leakage curves. Higher sound pressure levels in the frequency response curve indicate more sound leakage. The solid line represents the sound leakage prevention curve for the quadrupole sound source solution, while the dashed line represents the sound leakage prevention curve for the dipole sound source solution. Clearly, the quadrupole sound source solution offers superior sound leakage prevention capabilities in the human ear's sensitive frequency range of 300-6000Hz.

[0247] The hook-shaped portion of the audio device shown in this case is used to hang on the ear, with the sound-emitting portion 17 close to the front of the auricle, and the groove-shaped portion can be connected by a headband or neckband. The headband or neckband connects the left and right ear audio devices, so that the audio device forms a whole and can be worn on the head.

[0248] The headband or neckband is formed of a plastic material, which may be polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), acrylonitrile-butadiene-styrene copolymer (ABS), silicone, etc. The memory titanium wire can be set in the plastic-molded headband or neckband by injection molding with the plastic or later assembly to adjust the clamping force of the headband or neckband and adjust the wearing comfort.

[0249] Compared with the prior art, the present application provides a first cavity 11 and a second cavity 12 at the front and rear ends of the speaker unit 20, and provides a first sound outlet 13 and a second sound outlet 14 in the first cavity 11, and provides a third sound outlet 15 and a fourth sound outlet 16 in the second cavity 12. The sound emitted by the first sound outlet 13 and the second sound outlet 14 has the same amplitude and opposite phase as the sound emitted by the third sound outlet 15 and the fourth sound outlet 16, thereby forming a multi-pole sound source. The lines connecting the center positions of the projections of the first sound outlet 13, the second sound outlet 14, the third sound outlet 15 and the fourth sound outlet 16 on a plane perpendicular to the vibration direction of the diaphragm form a quadrilateral. The multi-pole sound source has better attenuation for the mid- and low-frequency bands, especially the mid-frequency band to which the human ear is sensitive. When used in non-in-ear audio devices, it can effectively prevent sound leakage, thereby improving user privacy.

[0250] The present application also proposes an audio device, as shown in Figures 17 to 35. In one embodiment of the present application, the audio device includes a sound-emitting part 17, and the sound-emitting part 17 includes a shell 10 and at least one speaker unit 20. The speaker unit 20 includes at least one diaphragm. The speaker unit 20 is arranged inside a cavity formed by structural members, that is, the speaker unit 20 is arranged inside a cavity formed by the shell 10. A cavity is provided between the vibrating outer surface of the diaphragm and the inner wall of the shell 10, and a cavity is also provided between the side of the speaker unit 20 away from the diaphragm and the shell 10, and both cavities are provided with at least two sound outlets. The diaphragm radiates sound signals to the cavity on the same side, and the cavity on the side away from the diaphragm is also coupled, so that the sound signals radiated from the sound outlets of the two cavities have the same amplitude and opposite phases.

[0251] The two cavities are respectively named as the first cavity 11 and the second cavity 12. The first cavity 11 and the second cavity 12 are sound transmission cavities where the diaphragm vibrates to generate sound, which is then transmitted through the sound outlet.

[0252] In one embodiment, the speaker unit 20 includes a diaphragm, with the first cavity 11 positioned on one side of the diaphragm and the second cavity 12 positioned on the other side, away from the diaphragm. Due to the internal coupling structure of the speaker unit 20, the sound signals emitted from the sound outlet of the first cavity 11 and the second cavity 12 have the same amplitude but opposite phases. This embodiment involves a single speaker with a single diaphragm positioned within the housing 10, as shown in Figure 34.

[0253] In one embodiment, the speaker unit 20 is provided with two diaphragms, namely a first diaphragm 21 and a second diaphragm 22. The first diaphragm 21 corresponds to the first cavity 11, and the second diaphragm 22 corresponds to the second cavity 12. The sound signals radiated by the first diaphragm 21 and the second diaphragm 22 have the same amplitude and opposite phases. This design of two diaphragms can be implemented in the following ways:

[0254] 1. A dual-diaphragm, dual-voice coil speaker unit 20 is provided, as shown in Figure 32. The first diaphragm 21 is fixedly connected to one of the voice coils (first voice coil 25), and the second diaphragm 22 is fixedly connected to the other voice coil (second voice coil 27). The two voice coils drive their respective diaphragms to produce sound signals with equal amplitude and opposite phases. Specifically, the dual-diaphragm, dual-voice coil speaker unit 20 is electrically connected in series.

[0255] 2. It is provided by a dual-diaphragm single voice coil speaker unit 20, as shown in Figure 34. The first diaphragm 21 and the second diaphragm 22 are fixed to the same voice coil, and the coupling mechanism makes the first diaphragm 21 and the second diaphragm 22 emit sound signals with the same amplitude and opposite phases.

[0256] 3. Provided by two speaker units 20, as shown in Figure 35. One speaker unit 20 is provided with a first diaphragm 21, and the other speaker unit 20 is provided with a second diaphragm 22. In other words, the first diaphragm 21 and the second diaphragm 22 are both diaphragms on the speaker units 20. By controlling the current of the circuit, the first diaphragms 21 and the second diaphragms 22 of the two speaker units 20 emit sound signals with the same amplitude and opposite phases.

[0257] 4. It is provided by a speaker unit 20 and a passive diaphragm, as shown in Figure 32. The speaker unit 20 itself is provided with a diaphragm, or the passive diaphragm is fixedly bonded to the housing of the audio device. The diaphragm of the speaker unit 20, the passive diaphragm, and the housing of the speaker or the housing of the audio device form a sealed space. When the diaphragm of the speaker unit 20 vibrates, it drives the spatial vibration of the sealed space, thereby causing the passive diaphragm and the diaphragm of the speaker unit 20 to move in the same direction, thereby emitting sound signals with approximately the same amplitude and opposite phases. As shown in Figure 32, the housing 10 of the audio device of the present application is provided with a first assembly surface 101 and a second assembly surface 102. The speaker unit 20 is fixed inside the housing 10 and is located between the first assembly surface 101 and the second assembly surface 102, so that the first diaphragm 21 is mounted on the first assembly surface 101 and the second diaphragm 22 is mounted on the second assembly surface 102. The other components of the speaker unit 20 are arranged in the cavity between the first assembly surface 101 and the second assembly surface 102.

[0258] In other embodiments, the surface connecting the first assembly surface 101 and the second assembly surface 102 is referred to as the inner surface. The first diaphragm 21 or the second diaphragm 22 can be disposed on the inner surface according to actual needs.

[0259] As shown in Figures 22 to 24 and Figure 32, the outer surface of the shell 10 includes a first surface 103, a second surface 104 and a side surface 105. The first surface 103 is arranged near the ear hole, and the second surface 104 is arranged toward the outside. An outer surface of the first cavity 11 is the first surface 103, and an outer surface of the second cavity 12 is the second surface 104. The side surface 105 is the side connecting the first surface 103 and the second surface 104. Among them, in order to be able to distinguish in more detail, the side surface 105 includes a first side 1051, a second side 1052 and a third side 1053. The third side 1053 is the side of the bottom of the shell 10 connecting the first surface 103 and the second surface 104. The first side 1051 and the second side 1052 are respectively arranged on both sides of the third side 1053, and the first side 1051 and the second side 1052 are connected to the sides of the first surface 103 and the second surface 104.

[0260] The first cavity 11, corresponding to the first diaphragm 21, is provided with at least two sound holes. In this application, there are two sound holes, namely a first sound hole 13 and a second sound hole 14. The first sound hole 13 and the second sound hole 14 can be located simultaneously on the first surface 103 of the product, or simultaneously on the side surface 105, or respectively on the first surface 103 and the side surface 105, or simultaneously on the second surface 104, or respectively on the second surface 104 and the side surface 105. The location of the first sound hole 13 and the second sound hole 14 is set according to the actual needs of the product.

[0261] As shown in Figures 22 to 24 and 32, the second cavity 12 corresponding to the second diaphragm 22 is provided with at least two sound holes. In this application, there are two sound holes, namely a third sound hole 15 and a fourth sound hole 16. The third sound hole 15 and the fourth sound hole 16 can be located simultaneously on the second surface 104 of the product, or simultaneously on the side surface 105, or respectively on the second surface 104 and the side surface 105, or simultaneously on the first surface 103, or respectively on the first surface 103 or the side surface 105. The location of the third sound hole 15 and the fourth sound hole 16 is set according to the actual needs of the product.

[0262] In this embodiment, the first sound outlet 13 and the third sound outlet 15 form a dipole sound source, while the second sound outlet 14 and the fourth sound outlet 16 form a dipole sound source. Spatially, the two pairs of dipole sound sources with opposite phases and the same amplitude are close together, forming a longitudinal quadrupole sound source with a polarity structure of "-++-".

[0263] In this embodiment, the first cavity 11 is directly connected to the outside world through the first sound outlet 13 and the second sound outlet 14, that is, the sound is directly radiated to the outside world after passing through the first cavity 11; similarly, the third sound outlet 15 and the fourth sound outlet 16 also directly radiate sound to the outside world through the second cavity 12. This method can reduce the energy loss of sound waves during the propagation process.

[0264] In other embodiments, the first sound outlet 13 and the second sound outlet 14 are not directly connected to the first cavity 11. Depending on the design requirements, the first sound outlet 13 and the second sound outlet 14 are connected to the first cavity 11 through a first sound guide tube. The first sound guide tube can be a straight tube or a curved tube, and thus the channel of the first sound guide tube can be linear or circuitous, depending on the actual design requirements.

[0265] In other embodiments, the third sound outlet 15 and the fourth sound outlet 16 are not directly connected to the second cavity 12. Depending on the design requirements, the third sound outlet 15 and the fourth sound outlet 16 are connected to the second cavity 12 via a second sound guide tube. The second sound guide tube can be a straight tube or a curved tube, and thus the channel of the second sound guide tube can be linear or circuitous, depending on the actual design requirements.

[0266] The first diaphragm 21, the second diaphragm 22 and the mounting shell of the speaker unit 20 form a sealed space, which is called the third cavity 28. The voice coil, magnet, magnetic plate and other components are completely sealed in the third cavity 28, which can play a waterproof role. Specifically, the volume of the third cavity 28 does not exceed 8cm 3 .

[0267] In some embodiments, the first diaphragm 21 and the second diaphragm 22 can form a sealed space with the product housing 10, which is the fourth cavity 29. This sealed space has a similar function to the third cavity 28, so that the components behind the diaphragm, such as the voice coil, the magnetic guide plate and other magnetic circuit components 26, the speaker unit 20 housing bracket, etc., are completely sealed in the space. Because this sealed space seals the speaker unit housing bracket, the space is relatively large. Specifically, the volume of the sealed space does not exceed 18cm 3 .

[0268] In terms of space, the first diaphragm 21 and the second diaphragm 22 may be back to back, side by side, or side by side on the same side.

[0269] The vibration direction of the diaphragm is perpendicular to the effective vibration area of ​​the diaphragm.

[0270] The first sound outlet 13 , the second sound outlet 14 , the third sound outlet 15 and the fourth sound outlet 16 are projected onto a plane perpendicular to the vibration direction of the diaphragm to form a first projection area 131 , a second projection area 141 , a third projection area 151 and a fourth projection area 161 .

[0271] The center distance between the first projection area 131 and the second projection area 141 is less than or equal to 25 mm, and the first sound outlet 13 and the second sound outlet 14 emit sounds with the same amplitude and phase.

[0272] Specifically, the center distance between the third projection area 151 and the first projection area 131 is less than or equal to 15 mm.

[0273] Specifically, the center distance between the projection of the third sound hole 15 on a plane parallel to the vibration direction of the diaphragm of the speaker unit 20 and the projection of the first sound hole 13 on a plane parallel to the vibration direction of the diaphragm of the speaker unit 20 is less than 13 mm.

[0274] Specifically, the center distance between the first sound hole 13 and the third sound hole 15 is less than or equal to 20 mm.

[0275] The third sound outlet 15 and the first sound outlet 13 emit sounds with the same amplitude and opposite phases. The first sound outlet 13 is closer to the ear canal than the second cavity 12 and the third sound outlet 15. The distance from the first sound outlet 13 to the auricle is less than or equal to 15 mm.

[0276] The center distance between the third projection area 151 and the fourth projection area 161 is less than or equal to 25 mm, and the third sound outlet 15 and the fourth sound outlet 16 emit sounds with the same amplitude and phase.

[0277] Specifically, the center distance between the fourth projection area 161 and the second projection area 141 is less than or equal to 15 mm.

[0278] Specifically, the center distance between the projection of the fourth sound hole 16 on a plane parallel to the vibration direction of the diaphragm of the speaker unit 20 and the projection of the second sound hole 14 on a plane parallel to the vibration direction of the diaphragm of the speaker unit 20 is less than 13 mm.

[0279] Specifically, the center distance between the first sound hole 13 and the third sound hole 15 is less than or equal to 20 mm.

[0280] Specifically, the fourth sound outlet hole 16 and the second sound outlet hole 14 emit sounds with the same amplitude and opposite phases.

[0281] When the audio device is worn on the auricle, the second sound outlet 14 is farther from the ear canal than the first sound outlet 13 and closer to the cymba concha. The distance between the second sound outlet 14 and the cymba concha is less than or equal to 10 mm. The third sound outlet 15 is closer to the auricle opening than the fourth sound outlet 16.

[0282] Specifically, the first projection area 131 and the second projection area 141 are located on a straight line connecting the center points of the third projection area 151 and the fourth projection area 161, or are located on the same side of a straight line connecting the center points of the third projection area 151 and the fourth projection area 161, so as to form an acoustic quadrupole arranged in a row in space.

[0283] In the wearing state, the first sound outlet hole 13, the second sound outlet hole 14, the third sound outlet hole 15 and the fourth sound outlet hole 16 are located between the antitragus, the antihelix, the tragus and the lower crus of the antihelix.

[0284] The fourth sound hole 16 is opened toward the auricle. Specifically, the fourth sound hole 16 is opened toward the lower crus of the antihelix, the antihelix, and the antitragus. The closest distance between the center of the fourth sound hole 16 and the antihelix is ​​between 2mm and 10mm, the closest distance between the fourth sound hole 16 and the lower crus of the antihelix is ​​between 3mm and 12mm, and the closest distance to the antitragus is between 2mm and 7mm. The angle between the fourth sound hole 16 and the vertical axis of the user is between 10° and 35°. Due to the diversity of user auricles, this angle can prevent the fourth sound hole 16 from being blocked when the user wears the audio device.

[0285] As shown in Figures 3 and 22-32, the portion of the audio device exposed to the front of the auricle is defined as the sound-emitting portion 17, and the portion between the back of the auricle, i.e., the auricle and the side of the head, is defined as a hook-shaped band 18, wherein the hook-shaped band 18 is connected to the sound-emitting portion 17. To more clearly describe the relationship between the audio device and the human ear, the XYZ three-dimensional space coordinates are defined with the ear canal entrance as the origin. As shown in Figures 26 and 29, the X-axis is the positive semi-axis pointing outward from the ear canal entrance and is defined as the thickness direction, the Z-axis is the positive semi-axis pointing upward from the ear canal entrance toward the top of the head and is defined as the height direction, and the Y-axis is the positive semi-axis pointing toward the face from the ear canal entrance. The YZ plane, which summarizes the XYZ space coordinates, is perpendicular to the vibration direction of the speaker diaphragm.

[0286] Refer to Figures 27 and 28 to illustrate the relationship between the sound holes using the aforementioned XYZ coordinate system. The projection of the sound holes on the YZ plane is shown in Figure 27, and the projection of the sound holes on the XY plane is shown in Figure 28. The first sound hole 13, the second sound hole 14, the third sound hole 15, and the fourth sound hole 16 are projected onto a plane perpendicular to the vibration direction of the diaphragm, forming a first projected area 131, a second projected area 141, a third projected area 151, and a fourth projected area 161, respectively.

[0287] The first sound hole 13 is projected on the XY plane as a fifth projection area 132 , the second sound hole 14 is projected on the XY plane as a sixth projection area 142 , the third sound hole 15 is projected on the XY plane as a seventh projection area 152 , and the fourth sound hole 16 is projected on the XY plane as an eighth projection area 162 .

[0288] Although each person's auricle may be different, resulting in differences in the wearing state of the device, the sound outlet of the device is set at the entrance of the ear canal to maximize the sound leakage prevention effect of the device.

[0289] The audio device is worn on the auricle via a hook-shaped strap 18, with the sound-emitting portion 17 located in front of the auricle. The sound-emitting portion 17 has a long axis and a short axis that are perpendicular to the vibration direction of the diaphragm of the speaker unit 20. The long axis of the sound-emitting portion 17 is projected onto the YZ plane, forming a certain angle with the Y axis. Specifically, the angle is between 15° and 50°. More specifically, the angle is between 35° and 50°. This angle defines the position of the speaker unit on the auricle, ensuring that the speaker covers the auricle as much as possible and ensuring that the speaker placement angle conforms to the product's appearance and ergonomics.

[0290] To further illustrate the position of the sound-emitting portion 17 on the auricle, the audio device has a second side surface 1052 intersecting with the first surface 103, that is, a side shared by the second side surface 1052 and the first surface 103, forming a first edge. The portion of the first edge close to the connecting portion is higher than the tragus tubercle in the height direction. This design avoids excessive contact between the audio device and the tragus tubercle, thereby avoiding discomfort when worn. The third side surface 1053 is arranged opposite to the second side surface 1052, forming a tetrahedron-like structure in this embodiment, but is not limited to this structure, and may also be circular, elliptical, etc. The second edge is formed at the connection between the third side surface 1053 and the first surface 103. Part of the second edge contacts the intersection area of ​​the upper ear root and the helix.

[0291] The projection of the audio device along the thickness direction (X-axis) covers the cymba concha, the crus helix, part of the cavum concha, and part of the ear canal opening. The third side surface 1053 of the sound-producing portion 17 is arc-shaped along the height direction (Z-axis in Figure 26 ), with an arc radius of no less than 6.3 mm. The third side surface 1053 is located away from the ear canal opening and close to the antihelix, with a spacing of no less than 2 mm from the antihelix.

[0292] Figures 26 and 29 illustrate the structure of the first, second, third, and fourth sound holes 13, 14, 15, and 16 of the audio device on the auricle of the human ear. The first and second sound holes 13, 14 are located on the first surface 103 of the sound-emitting portion 17, as indicated by the dashed racetrack-shaped holes in Figure 26. The third and fourth sound holes 15, 16 are located on the second surface 104 of the sound-emitting portion 17, as indicated by the solid racetrack-shaped holes in Figure 26.

[0293] The long axes of the first sound outlet hole 13 and the second sound outlet hole 14 form an angle of 0-120° with the plane where the short axis of the audio device is located. In FIG. 26 of this embodiment, the angle is 0°.

[0294] As shown in Figure 25 , a raised structure 106 is provided on the first surface 103 of the audio device, facing the cavum concha. The first sound outlet 13 and the second sound outlet 14 are disposed on the end surfaces of raised structure 106. Raised structure 106 is higher than first surface 103. Specifically, the height of raised structure 106 above first surface 103 is 0.5mm-3mm. The raised structure 106 where the first sound outlet 13 is located is higher relative to first surface 103 than the raised structure 106 where the second sound outlet 14 is located, by at least 0.5mm. This means that the height of raised structure 106 is aligned with the structure of the audio device and the auricle, allowing more sound to reach the ear canal.

[0295] When worn normally, the line connecting the centers of the first sound outlet 13 and the second sound outlet 14 of the audio device forms an angle with the YZ plane of the coordinate system above, which is 25° to 70°; forms an angle with the XY plane, which is less than or equal to 150°; and forms an angle with the XZ plane, which is less than or equal to 150°.

[0296] In other embodiments, when worn normally, the angle between the plane perpendicular to the average normal line of the first sound outlet hole 13 and the YZ plane is less than or equal to 40°.

[0297] In other embodiments, the angle between the center line of the first sound outlet 13 and the center line of the second sound outlet 14 and the plane formed by the base of the auricle, the antihelix and the notch between the tragus and the ear is less than or equal to 35°.

[0298] In other embodiments, the angle between a plane perpendicular to the average normal of the first sound outlet 13 and a plane formed by the base of the auricle, the antihelix, and the notch between the tragus is less than or equal to 35°.

[0299] The center line of the third sound outlet hole 15 and the fourth sound outlet hole 16 forms an angle with the ZY plane that is less than or equal to 40°; forms an angle with the XY plane that is less than or equal to 150°; and forms an angle with the XZ plane that is less than or equal to 150°.

[0300] The angle between the plane perpendicular to the average normal of the third sound outlet hole 15 and the YZ plane is less than or equal to 82°.

[0301] The angle between the center line of the third sound outlet 15 and the fourth sound outlet 16 and the plane formed by the base of the auricle, the antihelix and the notch between the tragus is less than or equal to 35 degrees.

[0302] The angle between the plane perpendicular to the average normal of the first sound outlet 13 and the plane formed by the base of the auricle, the antihelix and the notch between the tragus is less than or equal to 65 degrees.

[0303] The fourth sound outlet 16 faces the anti-helix and is approximately 5 mm away from the anti-helix when worn. To minimize standing waves between the fourth sound outlet 16 and the anti-helix, the ratio of the length of the fourth sound outlet 16 to the height of the first surface 103 of the audio device is greater than 0.6.

[0304] Specifically, the length-to-width ratio of the sound outlet hole of the second cavity 12 is not less than 2.5.

[0305] To illustrate the relationship between the sound holes, we'll continue with the XYZ coordinate system. The projections of the sound holes on the YZ and XY planes are shown in Figure 29. The center-to-center distance between the first and third sound holes 13, 15 on the YZ plane is 3mm to 7mm, specifically 4mm. The center-to-center distance between the first and second sound holes 13, 14 on the YZ plane is 4mm to 8mm, specifically 6mm. The center-to-center distance between the second and fourth sound holes 14, 16 on the YZ plane is 4mm to 8mm, specifically 6mm.

[0306] In this case, the YZ plane is perpendicular to the vibration direction of the speaker diaphragm, so as shown in Figures 27 to 31, the projections of the third sound hole 15 and the fourth sound hole 16 on the YZ plane are the aforementioned third projection area 151 and fourth projection area 161, and the projections of the first sound hole 13 and the second sound hole 14 on the YZ plane are the aforementioned first projection area 131 and second projection area 141. The first projection area 131 and the second projection area 141 are on the line connecting the centers of the third projection area 151 and the fourth projection area 161.

[0307] The midpoint of the line connecting the center points of the first projection area 131 and the third projection area 151 is set as the first midpoint, and the midpoint of the line connecting the center points of the second projection area 141 and the third projection area 151 is set as the second midpoint. The distance range between the first midpoint and the second midpoint is 7 mm to 25 mm.

[0308] The difference between the distance between the center points of the first projection area 131 and the third projection area 151 and the distance between the center points of the second projection area 141 and the third projection area 151 ranges from 0 mm to 5 mm.

[0309] The center-to-center distance between the first and third sound holes 13, 15, projected on the XY plane is 6 mm to 10 mm, specifically 8 mm. The center-to-center distance between the second and fourth sound holes 14, 16, projected on the XY plane is 6 mm to 10 mm, specifically 8 mm. The center-to-center distance between the first and second sound holes 13, 14, projected on the XY plane is 3 mm to 7 mm, specifically 5 mm.

[0310] The center line connecting the first sound outlet 13 and the third sound outlet 15 passes through the first diaphragm 21 of the speaker unit 20 and forms an angle of less than or equal to 80° with a plane perpendicular to the vibration direction of the speaker unit 20 .

[0311] The angle between the center line connecting the first sound hole 13 and the third sound hole 15 and the plane perpendicular to the average normal line of the first sound hole 13 is 15° to 75°.

[0312] The center line connecting the second sound outlet 14 and the fourth sound outlet 16 passes through the first diaphragm 21 of the speaker unit 20 and forms an angle of less than or equal to 80° with a plane perpendicular to the vibration direction of the speaker unit 20 .

[0313] An angle between a line connecting the centers of the second sound hole 14 and the fourth sound hole 16 and a plane perpendicular to the average normal of the second sound hole 14 is in a range of 15° to 75°.

[0314] When the audio device is worn, the fourth sound outlet 16 faces the antihelix. Specifically, the angle between the opening direction of the fourth sound outlet 16 toward the antihelix and the aforementioned Z axis is 5° to 30°.

[0315] Due to the structure of the audio device, the sound holes cannot fully meet the conditions of a quadrupole sound source in three-dimensional space. In order to optimize the spatial layout and better improve the ability to prevent sound leakage, the sound source formed by the sound holes can be arranged closer to the structure of a longitudinal quadrupole sound source in space. The third sound hole 15 and the fourth sound hole 16 can be set on the side. This can be divided into the following situations:

[0316] 1. The third sound outlet 15 and the fourth sound outlet 16 are respectively provided on the second side surface 1052 and the third side surface 1053;

[0317] 2. The third sound hole 15 and the fourth sound hole 16 are all disposed on the first side surface 1051;

[0318] 3. The third sound outlet 15 and the fourth sound outlet 16 are both provided on the third side surface 1053 , close to the first edge;

[0319] 4. The third sound hole 15 is provided on the second side surface 1052, close to the second edge; the fourth sound hole 16 is provided on the first side surface 1051, or the fourth sound hole 16 extends from the first side surface 1051 to the third side surface 1053. This situation is shown in Figure 29.

[0320] Figures 26 and 29 illustrate the structure of the first, second, third, and fourth sound outlets 13, 14, 15, and 16 of the audio device on the concha of the human ear. The first and second sound outlets 13, 14 are positioned on the first surface 103 of the sound-emitting portion 17, as indicated by the dashed racetrack-shaped holes in Figure 29. The long axes of the first and second sound outlets 13, 14 form an angle of 0-120° with the plane of the short axis of the audio device, with the angle shown as 90°.

[0321] Specifically, a vertical distance between the center of the fourth sound hole 16 and the first edge is less than or equal to 10 mm, and a vertical distance between the center of the third sound hole 15 and the second edge is less than or equal to 10 mm.

[0322] Specifically, the center line of the first sound hole 13 and the second sound hole 14 forms an angle with the YZ plane ranging from 25° to 70°; an angle with the XY plane less than or equal to 150°; and an angle with the XZ plane less than or equal to 150°.

[0323] Specifically, the angle between the plane perpendicular to the average normal of the first sound outlet hole 13 and the YZ plane is less than or equal to 40°.

[0324] Specifically, the angle between the center line of the first sound outlet hole 13 and the center line of the second sound outlet hole 14 and the plane formed by the base of the auricle, the antihelix and the notch between the tragus is less than or equal to 35°.

[0325] Specifically, the angle between a plane perpendicular to the average normal of the first sound outlet 13 and a plane formed by the base of the auricle, the antihelix, and the notch between the tragus is less than or equal to 35°.

[0326] Specifically, the line connecting the centers of the third sound hole 15 and the fourth sound hole 16 forms an angle with the ZY plane that is less than or equal to 40°; forms an angle with the XY plane that is less than or equal to 150°; and forms an angle with the XZ plane that is less than or equal to 150°.

[0327] Specifically, the angle between the center line of the third sound outlet 15 and the fourth sound outlet 16, the plane perpendicular to the average normal of the third sound outlet 15, and the YZ plane is less than or equal to 82°. The angle between the center line of the third sound outlet 15 and the fourth sound outlet 16 and the plane formed by the base of the auricle, the antihelix, and the notch between the tragus is less than or equal to 35°.

[0328] Specifically, the angle between the plane connecting the centers of the third sound outlet 15 and the fourth sound outlet 16, the plane perpendicular to the average normal of the first sound outlet 13, and the plane formed by the base of the auricle, the antihelix and the notch between the tragus is less than or equal to 65°.

[0329] The fourth sound outlet 16 is partially located near the anti-helix and partially located near the inferior crus of the helix, with a distance of 3 mm from the anti-helix. To reduce standing waves between the fourth sound outlet 16 and the anti-helix, the ratio of the length of the fourth sound outlet 16 to the height of the first surface 103 of the audio device is greater than 0.6; alternatively, the ratio of the length of the fourth sound outlet 16 to the length of the first surface 103 of the audio device is greater than 0.6.

[0330] Specifically, the length-to-width ratio of the sound outlet hole of the second cavity 12 is not less than 2.5.

[0331] To illustrate the relationship between the sound holes, the XYZ coordinate system mentioned above is used. The projection of the sound holes on the YZ plane is shown in Figure 30 , and the projection of the sound holes on the XY plane is shown in Figure 31 . The first sound hole 13 is projected on the XY plane as a fifth projection area 132 , the second sound hole 14 is projected on the XY plane as a sixth projection area 142 , the third sound hole 15 is projected on the XY plane as a seventh projection area 152 , and the fourth sound hole 16 is projected on the XY plane as an eighth projection area 162 .

[0332] The projected center distance between the first and third sound holes 13, 15 on the YZ plane is 4 mm. The projected center distance between the first and second sound holes 13, 14 on the YZ plane is 4 mm. The projected center distance between the second and fourth sound holes 14, 16 on the YZ plane is 4 mm.

[0333] The line connecting the projection centers of the third and fourth sound outlet holes 15 and 16 on the YZ plane is collinear with the line connecting the projection centers of the first and second sound outlet holes 13 and 14 on the YZ plane. The angle formed by these connecting lines with the XY plane is less than or equal to 150°. Preferably, the angle is between 120° and 150°.

[0334] The distance between the projection centers of the first sound hole 13 and the third sound hole 15 on the XY plane is 6 mm, the distance between the projection centers of the second sound hole 14 and the fourth sound hole 16 on the XY plane is 6 mm, and the distance between the projection centers of the first sound hole 13 and the second sound hole 14 on the XY plane is 3 mm.

[0335] The line connecting the centers of the first and third sound outlet holes 13, 15 passes through the first diaphragm 21 of the speaker unit 20 and forms an angle of less than or equal to 80°, specifically less than or equal to 45°, with a plane perpendicular to the vibration direction of the speaker unit 20. The angle between the line connecting the centers of the first and third sound outlet holes 13, 15, and a reference plane perpendicular to the average normal of the first sound outlet hole 13 is between 15° and 65°.

[0336] The line connecting the centers of the second sound outlet 14 and the fourth sound outlet 16 passes through the first diaphragm 21 of the speaker unit 20 and forms an angle of less than or equal to 80°, specifically less than or equal to 45°, with a plane perpendicular to the vibration direction of the speaker unit 20. The angle between the line connecting the centers of the second sound outlet 14 and the fourth sound outlet 16 and a reference plane perpendicular to the average normal of the second sound outlet 14 is between 15° and 65°.

[0337] The fourth sound outlet 16 faces the helix and the lower crus of the helix, specifically the anti-helix, and the angle between the opening direction and the vertical axis of the user is 5° to 30°.

[0338] Based on the above scheme, in the process of optimizing the spatial position of the quadrupole sound source, the positions of the sound holes can be adjusted as shown in Figures 26 and 29. The positions of the first sound hole 13, the second sound hole 14, the third sound hole 15, and the fourth sound hole 16 can be designed according to actual design requirements.

[0339] In this case, as described above, the audio device is provided with one or more speaker units 20 and a passive diaphragm. When the diaphragm of the speaker unit 20 vibrates, sound signals with the same amplitude and opposite phases are emitted in front and behind the diaphragm.

[0340] In one embodiment of the present application, as shown in Figure 32 , a speaker unit 20 is disposed within the sound-producing portion 17. The speaker unit 20 comprises a first diaphragm 21, a second diaphragm 22, a voice coil 25, and a magnetic circuit assembly 29. Referring to Figure 29 , the position of the sound-producing portion on the auricle ensures that the projection of the speaker unit 20's major axis on the XY plane is greater than or equal to the projection of its minor axis on the XZ plane.

[0341] As shown in FIG32 , in conjunction with FIG29 , the first diaphragm 21 is bonded to the voice coil. When an AC signal is applied to the voice coil, the voice coil 25, driven by the magnetic circuit assembly 26, causes the first diaphragm 21 to vibrate. The first diaphragm 21, together with the inner and side walls of the first surface 103 of the sound-emitting portion 17, forms a first cavity 11. The sound signal generated by the first diaphragm 21 is emitted through the first and second sound outlets 13 and 14 of the first cavity 11 as two sound signals with the same amplitude and phase. In this embodiment, the second diaphragm 22 is the passive diaphragm of the speaker unit 20. The second diaphragm 22 is bonded to the housing 10 of the speaker unit 20 and forms a completely sealed space with the housing 10 and the first diaphragm 21, forming a third cavity 28. Components such as the voice coil and magnetic circuit assembly 26 are located within the third cavity 28. During the first vibration, the air within the third cavity 28 is pushed, causing the second diaphragm 22 to vibrate in the same direction as the first diaphragm 21. The same-direction vibration is manifested as follows: when the first diaphragm 21 vibrates in the direction away from the magnetic circuit component 26, the second diaphragm 22 vibrates in the direction close to the magnetic circuit component 26; conversely, when the first diaphragm 21 vibrates in the direction close to the magnetic circuit component 26, the second diaphragm 22 vibrates in the direction away from the magnetic circuit component 26.

[0342] In this embodiment, the second diaphragm 22 is directly bonded and fixed to the speaker unit 20 to form a component. It is easy to imagine that in this embodiment, the second diaphragm 22 can be separated from the speaker unit 20 so that the second diaphragm 22 can be installed and fixed to the audio device. The second diaphragm 22, the first diaphragm 21 and the shell of the audio device form a third cavity 28.

[0343] Since the first diaphragm 21 needs to further act on the second diaphragm 22 by pushing the air inside the third cavity 28, the volume of air sealed by the third cavity 28 should be as small as possible. It is preferred that the volume of the third cavity 28 is less than or equal to 8 cm 3 .

[0344] In order to control the first diaphragm 21 and the second diaphragm 22 to emit sound signals with the same amplitude and opposite phases, it is necessary to control the parameters of the first vibration system where the first diaphragm 20 is located and the vibration system where the second diaphragm 22 is located.

[0345] As shown in Figure 32, the first diaphragm 21 and the first voice coil 25 form a first vibration system, and the resonant frequency of the first vibration system is F1. The second diaphragm 22 has a similar structure to the first diaphragm 21, but does not include a voice coil. Instead, the first diaphragm 21 acts on the air in the third cavity 28, driving the vibration of the second diaphragm 22. Therefore, the second diaphragm 22 forms a second vibration system, and the resonant frequency of the second vibration system is F2.

[0346] The resonant frequency of a vibration system is influenced by its mass, elasticity, and internal damping. The mass of the vibration system is affected by components such as the surround 211, the vibrating portion 212, and the first voice coil 25. Elasticity is influenced by the material, thickness, and width of the surround 211, as well as the size of the space enclosed by the first and second diaphragms 21 and 22. Internal damping is also affected by the material of the surround 211. The vibration system's ability to radiate sound is affected by the displacement and area of ​​the diaphragms.

[0347] When the first diaphragm 21 and the second diaphragm 22 emit sound signals with the same amplitude and opposite phases, the resonant frequency F1 of the first vibration system and the resonant frequency F2 of the second vibration system are relatively close. Preferably, the ratio of F1 to F2 is 0.7-1.3.

[0348] The rim 211 of the second diaphragm 22 has a similar compliance to that of the rim 211 of the first diaphragm 21. Preferably, the ratio of the thickness of the rim 211 of the second diaphragm 22 to the thickness of the rim 211 of the first diaphragm 21 is 0.5-2.2.

[0349] Preferably, the folding ring 211 can be made of materials such as PU and liquid silicone.

[0350] Preferably, the mass of the second vibration system is 0.1-2.2 times the mass of the first vibration system.

[0351] Preferably, the internal damping of the second diaphragm 22 is 0.5-5 times the internal damping of the first diaphragm 21 .

[0352] Preferably, the area of ​​the second diaphragm 22 is 0.8-2 times the area of ​​the first diaphragm 21 .

[0353] Furthermore, the sound signal from the diaphragm is coupled through the cavity in front of the diaphragm and then emitted outward through the sound outlet. For example, in this embodiment, the first diaphragm 21 forms the first cavity 11 with the inner wall and sidewalls of the second surface 103 of the sound-emitting portion 17. The sound signal generated by the first diaphragm 21 is emitted through the first sound outlet 13 and the second sound outlet 14 of the first cavity 11. The second diaphragm 22 forms the second cavity 12 with the inner wall and sidewalls of the second surface 104 of the sound-emitting portion 17. The sound signal generated by the second diaphragm 22 is emitted through the third sound outlet 15 and the fourth sound outlet 16 of the second cavity 12. To ensure that the sound outlets in the first cavity 11 emit signals with the same amplitude and phase, the volume of the first cavity, the area of ​​the sound outlets, and the openings of the mesh attached to the sound outlets need to be designed and adjusted. The above design and adjustment also apply to the sound outlets and their mesh in the second cavity 12, so that the sounds emitted by the sound outlets in the first cavity and the second cavity have the same amplitude and opposite phase.

[0354] To achieve the above effect, the area of ​​the first sound hole 13, the second sound hole 14, the third sound hole 15 and the fourth sound hole 16 is not less than 4mm 2 When the opening area is small, the low-frequency radiation capability of the audio device will be reduced, while high-frequency resonance peaks will be introduced.

[0355] Specifically, the area of ​​the first sound outlet hole 13 is 0.4-2.5 times the area of ​​the second sound outlet hole 14 .

[0356] Specifically, the area of ​​the third sound outlet hole 15 is 0.4-2.5 times the area of ​​the fourth sound outlet hole 16 .

[0357] Specifically, the area of ​​the first sound outlet hole 13 is 0.4-2.5 times the area of ​​the third sound outlet hole 15 .

[0358] Specifically, the area of ​​the second sound outlet hole 14 is 0.4-2.5 times the area of ​​the fourth sound outlet hole 16 .

[0359] Specifically, the first sound hole 13, the second sound hole 14, the third sound hole 15 and the fourth sound hole 16 can be attached with a tuning mesh, and the acoustic resistance formed by the sound hole and the acoustic mesh is less than or equal to 9*109Pa·s / m 3 .

[0360] Specifically, the volumes of the first cavity 11 and the second cavity 12 are both greater than 0.8 cm 3 .

[0361] Specifically, the volume of the first cavity 11 may be 0.4-6 times the volume of the second cavity 12 .

[0362] Specifically, the inner surface of the first cavity 11 is less than or equal to 3 mm away from the diaphragm of the speaker unit 20 (the first diaphragm 21 or the second diaphragm 22 ) in the vibration direction of the speaker unit 20 .

[0363] Another embodiment is shown in Figure 33. In this embodiment, the second vibration system is formed by the second diaphragm 22 and the second voice coil 27. The second diaphragm 22 is sealed and fixed on the housing 10 of the speaker unit 20, and the second voice coil 27 is fixed on one side of the second diaphragm 22. The first vibration system is formed by the first diaphragm 21 and the first voice coil 25. When the speaker unit 20 is working, the first voice coil 25 and the second voice coil 27 are connected in series. When the same audio signal flows through the first voice coil 25 and the second voice coil 27, the first vibration system and the second vibration system vibrate in the same direction. The first diaphragm 21 and the second diaphragm 22 form a third cavity 28 with the housing 10 of the speaker unit 20. The magnetic circuit assembly 26, the first voice coil 25, the second voice coil 27 and other components of the speaker unit 20 are sealed in the third cavity 28. The space is less than or equal to 8cm 3 There are two magnetic circuit components 26, namely the first magnetic circuit 261 and the second magnetic circuit 262. Preferably, the space is less than or equal to 2cm 3 As described in the previous embodiment, in this embodiment, the first vibration system is composed of the first diaphragm 21 and the first voice coil 25, and the second vibration system is composed of the second diaphragm 22 and the second voice coil 27. In order to make the first diaphragm 21 and the sound outlet of the first cavity 11 and the second diaphragm 22 and the sound outlet of the second cavity 12 emit sounds with the same amplitude and opposite phases, the relevant parameters of the first vibration system and the second vibration system, as well as the sound outlet and the mesh, are the same as those in the previous embodiment and will not be repeated here.

[0364] In another embodiment, as shown in Figure 34 , the speaker unit 20 in the previous embodiment is replaced with a speaker unit 20 having a single diaphragm. In this embodiment, the front of the speaker unit 20 faces the first cavity 11, while the rear end faces the second cavity 12. The spatial relationships between the sound hole size, the size of the sound hole and the diaphragm, and other aspects of the previous embodiment can also be used in the audio device of this embodiment to form a quadrupole sound source, and the same techniques apply.

[0365] Another embodiment is shown in Figure 35 . In the audio device of Figure 33 , the first voice coil 25 of the speaker unit 20 is fixedly connected to both the first diaphragm 21 and the second diaphragm 22. The first diaphragm 21 and the first voice coil 25 form a first vibration system, with a resonant frequency of F1. The second diaphragm 22 has a similar structure to the first diaphragm 21 and, together with the first voice coil 25, forms a second vibration system, with a resonant frequency of F2. A sealed space is formed between the first and second diaphragms and the housing of the speaker 20. When a current signal is applied to the first voice coil 25, it propels the first and second diaphragms to move in the same direction. To ensure that the first diaphragm and the first cavity sound outlet, and the second diaphragm and the second cavity sound outlet, emit sounds with the same amplitude and opposite phases, the parameters of the first and second vibration systems, the sound outlets, and the mesh are the same as those described in the embodiment of Figure 32 above and will not be repeated here.

[0366] As shown in Figures 14-17, one or more acoustic dipole tubes can be disposed between the first cavity 11 and the second cavity 12. In this embodiment, these include a first dipole tube 111 and a second dipole tube 112. The first dipole tube 111 and the second dipole tube 112 are used to connect the first cavity 11 and the second cavity 12. The opening end surfaces of the first dipole tube 111 and the second dipole tube 112 are located in the first cavity 11 and the second cavity 12, respectively. The ability to prevent sound leakage can be improved by adjusting the parameters of the first dipole tube 111 and the second dipole tube 112.

[0367] In another embodiment, the speaker unit 20 is replaced with two speaker units 20 each having only one diaphragm, as shown in FIG35 . The speaker unit 20 includes a first speaker 201 and a second speaker 202. The first speaker 201 and the second speaker 202 are mounted facing away from each other, with the diaphragm of the first speaker 201 facing the first cavity 11, and the diaphragm of the second speaker 202 facing the second cavity 12.

[0368] A third cavity 28 is formed between the diaphragm 21 of the first speaker 201 and the diaphragm 23 of the second speaker 202 and the housing. The magnetic circuit system of the speaker unit 20 is located in the sealed cavity and is well protected from erosion by external liquids, thereby maintaining the performance of the speaker unit.

[0369] The volume of the sealed space is less than or equal to 8 cm 3 , preferably less than or equal to 3cm 3 .

[0370] The first vibration system is provided by the first diaphragm 21 and its attached voice coil, while the second vibration system is provided by the second diaphragm 22 and its attached voice coil. To ensure that the first diaphragm and the first cavity sound outlet, and the second diaphragm and the second cavity sound outlet, emit sounds with equal amplitude and opposite phases, the parameters of the first and second vibration systems, as well as the sound outlets and mesh, are the same as those described in the embodiment of FIG32 above and will not be repeated here.

[0371] In another embodiment, as shown in FIG18 , the speaker unit 20 includes a first speaker 201, a second speaker 202, a third speaker 203, and a fourth speaker 204, each of which includes a diaphragm. The diaphragms corresponding to the first speaker 201, the second speaker 202, the third speaker 203, and the fourth speaker 204 are a first diaphragm 21, a second diaphragm 22, a third diaphragm 23, and a fourth diaphragm 24.

[0372] In terms of space, the first diaphragm 21 , the second diaphragm 22 , the third diaphragm 23 and the fourth diaphragm 24 may be back to back, side by side, or side by side on the same side.

[0373] Each sound outlet can emit sound signals by radiating them outward from an independent diaphragm. The first diaphragm 21 emits sound to the outside world through the first sound outlet 13, coupled to the first cavity 11. The second diaphragm 22 emits sound signals to the outside world through the third sound outlet 15, coupled to the second cavity 12. The third diaphragm 23 emits sound signals to the outside world through the second sound outlet 14, coupled to the seventh cavity 30. The fourth diaphragm 24 emits sound signals to the outside world through the fourth cavity 29, coupled to the fourth sound outlet 16.

[0374] The first diaphragm 21 and the second diaphragm 22 form a sealed space with the outer wall of the speaker unit 20 or the inner wall of the housing 10, referred to as the fifth cavity 281. The magnetic circuit components, voice coils, and other components of the first and second speakers 201, 202 are sealed within the fifth cavity 281. The first and second diaphragms 21, 22 can be driven as a pair, vibrating in the same direction, and can produce sounds with the same amplitude and opposite phases.

[0375] The third and fourth diaphragms 23, 24, and the outer walls of the third and fourth speakers 203, 204, or the inner walls of the housing 10, form a sealed space, referred to as the sixth cavity 291. The magnetic circuit components, voice coils, and other components of the third and fourth speakers 203, 204 are enclosed within this sealed space. The third and fourth diaphragms 23, 24 can be driven as a pair, vibrating in the same direction, to produce sounds with the same amplitude and opposite phases.

[0376] The first diaphragm 21 and the third diaphragm 23 emit sounds with the same amplitude and phase; similarly, the second diaphragm 22 and the fourth diaphragm 24 emit sounds with the same amplitude and phase. The sound emitted by the diaphragms radiates outward through the four cavities and sound holes. The sound hole 13 of the first cavity 11 and the sound hole 15 of the second cavity 12 are analogous to the first sound hole 13 and the third sound hole 15 mentioned above. The sounds emitted by them constitute a pair of quasi-dipole sound sources. The sound hole 14 of the third cavity 30 and the sound hole 16 of the fourth cavity 29 are analogous to the second sound hole 14 and the fourth sound hole 16 mentioned above. The sounds emitted by them constitute a pair of quasi-dipole sound sources. The two pairs of quasi-dipole sound sources constitute a quasi-quadrupole sound source. The parameters such as the sound hole size, position, and angle mentioned above are also applicable in this case.

[0377] In FIG17 , the first diaphragm 21 and the second diaphragm 22 form a first cavity 11 and a second cavity 12 through the speaker bracket and the housing 10 , and the first diaphragm 21 and the second diaphragm 22 form a sealed fifth cavity 281 through the speaker bracket and the housing 10 ;

[0378] The back side of the first diaphragm 21, i.e., the side closest to the magnet, is connected to the fifth cavity 281 through a sound outlet hole on the speaker bracket. The back side of the second diaphragm 22, i.e., the side closest to the magnet, is connected to the fifth cavity 281 through a sound outlet hole on the speaker bracket. The first and second diaphragms 21, 22 can be driven in pairs to emit sounds with the same amplitude but opposite phases.

[0379] The third diaphragm 23 and the fourth diaphragm 24 form a seventh cavity 30 and a fourth cavity 29 through the speaker bracket and the housing 10. The third diaphragm 23 and the fourth diaphragm 24 form a sealed sixth cavity 291 through the speaker bracket and the housing 10.

[0380] The back side of the third diaphragm 23, i.e., the side closest to the magnet, is connected to the sixth cavity 291 through a sound outlet hole on the speaker bracket. The back side of the fourth diaphragm 24, i.e., the side closest to the magnet, is connected to the sixth cavity 291 through a sound outlet hole on the speaker bracket. The third and fourth diaphragms 23, 24 can be driven in pairs to emit sounds with the same amplitude but opposite phases.

[0381] As mentioned above, the volume of the fifth cavity 281 and the sixth cavity 291 cannot be too large, and in some embodiments, it is less than or equal to 8 cm 3 , more preferably, less than or equal to 3cm 3 .

[0382] In order to achieve a good acoustic quadrupole effect, the vibration systems of the first speaker 201, the second speaker 202, the third speaker 203, and the fourth speaker 204 have close resonance frequencies.

[0383] The speaker unit 20 or the passive diaphragm provides a vibration system, the first vibration system is provided by the first speaker unit 201 , the second vibration system is provided by the second speaker unit 202 , the third vibration system is provided by the third speaker unit 203 , and the fourth vibration system is provided by the fourth speaker unit 204 .

[0384] The first vibration system and the second vibration system have close resonant frequencies. Specifically, the ratio of the resonant frequencies is 0.7-1.3.

[0385] The third vibration system and the fourth vibration system have close resonant frequencies. Specifically, the ratio of the resonant frequencies is 0.7-1.3.

[0386] The second vibration system and the fourth vibration system have close resonant frequencies. Specifically, the ratio of the resonant frequencies is 0.7-1.3.

[0387] The rim 211 of the third diaphragm 23 has a similar compliance to that of the rim 211 of the first diaphragm 21. Specifically, the ratio of the thickness of the rim 211 of the third diaphragm 23 to that of the first diaphragm 21 is 0.88-2.2.

[0388] Specifically, the folding ring 211 is made of materials such as PU and liquid silicone.

[0389] Preferably, the mass of the fourth vibration system is 0.1-2.2 times the mass of the second vibration system

[0390] Preferably, the internal damping of the fourth diaphragm 24 is 0.5-5 times the internal damping of the second diaphragm 22 .

[0391] Preferably, the area of ​​the fourth diaphragm 24 is 0.8-2 times the area of ​​the second diaphragm 22 .

[0392] The rim 211 of the second diaphragm 22 has a similar compliance to that of the rim 211 of the first diaphragm 21 . Preferably, the ratio of the thickness of the rim 211 of the second diaphragm 22 to the thickness of the rim 211 of the first diaphragm 21 is 0.9-1.1.

[0393] Specifically, the folding ring 211 is made of materials such as PU and liquid silicone.

[0394] Specifically, the mass of the second vibration system is 1.05-1.2 times the mass of the first vibration system.

[0395] Specifically, the internal damping of the third diaphragm 23 is 0.9-1.1 times the internal damping of the first diaphragm 21 .

[0396] Specifically, the area of ​​the second diaphragm 22 is similar to the area of ​​the first diaphragm 21 .

[0397] In this embodiment, the relevant parameters of the first cavity 11 and its sound hole 13, the seventh cavity 30 and its sound hole 14, the second cavity 12 and its sound hole 15, and the fourth cavity 24 and its sound hole 16 are the same as those of the embodiment described in Figure 32 above and will not be repeated.

[0398] In some embodiments, referring to the embodiment of Figure 18, it is easy to imagine replacing the second speaker 203 and the fourth speaker 204 with a passive diaphragm. The passive diaphragm can be fixed to the housing of the audio device by gluing and sealing, and the effect as in the embodiment of Figure 17 can be achieved by adjusting the mass, compliance and internal damping of the passive diaphragm.

[0399] Another embodiment, as shown in FIG19 , refers to the embodiment described in FIG19 , and through design, the two speakers can be replaced with a single speaker with dual magnetic circuits and dual diaphragms. Specifically, the speaker unit 20 includes two speakers with two diaphragms. The speaker unit 20 includes a first speaker 201 and a second speaker 202; wherein the first speaker 201 has a first diaphragm 21 and a second diaphragm 22, and the second speaker 202 has a third diaphragm 23 and a fourth diaphragm 24. The first diaphragm 21 and the second diaphragm 22 form a sealed cavity 281 with the bracket of the first speaker 201, and the magnetic circuit system is located in the sealed space. The third diaphragm 223 and the fourth diaphragm 24 form a sealed space 291 with the second speaker 202, and the magnetic circuit system is located in the sealed space.

[0400] The volume of the sealed space is less than or equal to 8 cm 3 , preferably less than or equal to 3cm 3 .

[0401] The first vibration system is provided by the first diaphragm 21 and its attached voice coil, the second vibration system is provided by the second diaphragm 22 and its attached voice coil, the third vibration system is provided by the third diaphragm 23 and its attached voice coil, and the fourth vibration system is provided by the fourth diaphragm 24 and its attached voice coil. The relevant vibration system technology is similar to that of the embodiment described in FIG18 and will not be elaborated here.

[0402] In this embodiment, the parameters of the first cavity 11 and its sound outlet 13, the second cavity 12 and its sound outlet 15, the seventh cavity 30 and its sound outlet 14, the fourth cavity 24 and its sound outlet 16, the fifth cavity 281, and the sixth cavity 291 are the same as those described in the embodiment of FIG32 above and will not be repeated here. The implementation of the acoustic quadrupole in the above scheme significantly improves both far-field sound leakage and near-field listening compared to the acoustic dipole.

[0403] As shown in Figure 20, the solid line represents the frequency response curve for the quadrupole sound source solution, while the dashed line represents the frequency response curve for the dipole sound source solution. Comparing the two curves, the solid line exhibits higher sound pressure levels in the 170Hz-2000Hz range, demonstrating better mid- and low-frequency performance. Furthermore, the solid line exhibits higher sound pressure levels in the 5900Hz-20000Hz range. This indicates that the quadrupole sound source solution has better sound reproduction capabilities in the mid- and high-frequency ranges than the dipole sound source solution, resulting in a greater degree of detail and richness in the sound, and better sound quality.

[0404] Figure 21 shows a comparison of sound leakage curves. Higher sound pressure levels in the frequency response curve indicate more sound leakage. The solid line represents the sound leakage prevention curve for the quadrupole sound source solution, while the dashed line represents the sound leakage prevention curve for the dipole sound source solution. Clearly, the quadrupole sound source solution offers superior sound leakage prevention capabilities in the human ear's sensitive frequency range of 300-6000Hz.

[0405] Compared with the prior art, the present application provides a first cavity 11 and a second cavity 12 at the front and rear ends of the speaker unit 20, and provides a first sound hole 13 and a second sound hole 14 in the first cavity 11, and provides a third sound hole 15 and a fourth sound hole 16 in the second cavity 12. The sound emitted by the first sound hole 13 and the second sound hole 14 has the same amplitude and opposite phase to the sound emitted by the third sound hole 15 and the fourth sound hole 16, thereby forming a multi-pole sound source. The multi-pole sound source has better attenuation for the mid- and low-frequency bands, especially the mid-frequency band to which the human ear is sensitive. When used on non-in-ear audio devices, it can effectively prevent sound leakage and improve user privacy.

[0406] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. An audio device, characterized in that: The audio device includes a sound-emitting portion, which includes a shell and at least one speaker unit. The speaker unit includes at least one diaphragm. The speaker unit is arranged inside the shell. The front end wall of the diaphragm and the inner circumferential wall of the front end of the shell form a first cavity. The rear end wall of the diaphragm and the inner circumferential wall of the rear end of the shell form a second cavity. The first cavity is provided with a first sound outlet hole and a second sound outlet hole. The second cavity is provided with a third sound outlet hole and a fourth sound outlet hole. The first sound outlet hole, the second sound outlet hole, the third sound outlet hole and the fourth sound outlet hole are respectively projected on a plane perpendicular to the vibration direction of the diaphragm to form a first projection area, a second projection area, a third projection area and a fourth projection area. The distance range of the center point connection line between the first projection area, the second projection area, the third projection area and the fourth projection area is 0 mm to 25 mm, and the first projection area and the second projection area are respectively located on both sides of the straight line where the center point connection line between the third projection area and the fourth projection area is located.

2. An audio device, characterized in that: The audio device includes a sound-emitting portion, the sound-emitting portion includes a shell and at least one speaker unit, the speaker unit includes at least one diaphragm, the speaker unit is arranged inside the shell, the front end wall of the diaphragm and the inner circumferential wall of the front end of the shell form a first cavity, the rear end wall of the diaphragm and the inner circumferential wall of the rear end of the shell form a second cavity, the first cavity is provided with a first sound outlet hole and a second sound outlet hole, the second cavity is provided with a third sound outlet hole and a fourth sound outlet hole, the first sound outlet hole, the second sound outlet hole, the third sound outlet hole and the fourth sound outlet hole are respectively projected on a plane perpendicular to the vibration direction of the diaphragm to form a first projection area, a second projection area, a third projection area and a fourth projection area, the distance between the center points of the first projection area, the second projection area, the third projection area and the fourth projection area is in the range of 0mm to 25mm, and the first projection area and the second projection area are located on the straight line between the center points of the third projection area and the fourth projection area, or are located on the same side of the straight line between the center points of the third projection area and the fourth projection area.

3. The audio device according to claim 1 or 2, characterized in that: The midpoint of the line between the center points of the first projection area and the third projection area is set as the first midpoint, the midpoint of the line between the center points of the second projection area and the third projection area is set as the second midpoint, and the distance range between the first midpoint and the second midpoint is 7mm to 25mm.

4. The audio device according to claim 1 or 2, characterized in that: The distance between the center points of the third projection area and the fourth projection area is not less than the distance between the center points of the first projection area and the second projection area.

5. The audio device according to claim 1 or 2, characterized in that: The areas of the first sound hole, the second sound hole, the third sound hole and the fourth sound hole are all greater than 4mm 2 .

6. The audio device according to claim 1 or 2, characterized in that: The speaker unit is provided with a diaphragm, the first cavity is provided at the front end of the diaphragm, and the second cavity is provided at the rear end of the diaphragm.

7. The audio device according to claim 1 or 2, characterized in that: The speaker unit is provided with two diaphragms, which are respectively a first diaphragm and a second diaphragm. The first diaphragm is arranged in the first cavity, and the second diaphragm is arranged in the second cavity.

8. The audio device according to claim 1 or 2, characterized in that: The speaker unit is a double-diaphragm double-voice coil speaker, and the speaker unit is provided with a first diaphragm, a second diaphragm, a first voice coil and a second voice coil, the first diaphragm is fixedly connected to the first voice coil, the second diaphragm is fixedly connected to the second voice coil, the first diaphragm is arranged in the first cavity, and the second diaphragm is arranged in the second cavity.

9. The audio device according to claim 1 or 2, characterized in that: The speaker unit is a double-diaphragm single voice coil speaker, and the speaker unit is provided with a first diaphragm, a second diaphragm and a first voice coil, the first diaphragm and / or the second diaphragm is arranged on the first voice coil, the first diaphragm is arranged in the first cavity, and the second diaphragm is arranged in the second cavity.

10. The audio device according to claim 1 or 2, characterized in that: The speaker unit is formed by two speakers, which are installed back to back. The diaphragm of one speaker is a first diaphragm, and the diaphragm of the other speaker is a second diaphragm. The first diaphragm is arranged in a first cavity, and the second diaphragm is arranged in a second cavity.

11. The audio device according to claim 1 or 2, characterized in that: The speaker unit includes a speaker and a passive diaphragm, the diaphragm of the speaker is a first diaphragm, the passive diaphragm is a second diaphragm, the passive diaphragm is arranged on the shell, and the passive diaphragm is located at the rear side of the speaker, the first diaphragm is arranged in the first cavity, and the passive diaphragm is arranged in the second cavity.

12. The audio device according to claim 1 or 2, characterized in that: A first assembly surface and a second assembly surface are arranged in the shell, the speaker unit is arranged between the first assembly surface and the second assembly surface, the first diaphragm is located on the first assembly surface, and the second diaphragm is located on the second assembly surface.

13. The audio device according to claim 1 or 2, characterized in that: The outer surface of the shell includes a first surface, a second surface and a side surface. The first surface is the outer side surface of the first cavity, and the second surface is the outer side surface of the second cavity.

14. The audio device according to claim 13, characterized in that The side surface includes a first side surface, a second side surface and a third side surface, the third side surface is a side surface of the bottom of the shell connecting the first surface and the second surface, the first side surface and the second side surface are respectively arranged on both sides of the third side surface, and the first side surface and the second side surface are connected to the sides of the first surface and the second surface.

15. The audio device according to claim 13, characterized in that The first sound outlet hole and the second sound outlet hole are arranged on the first surface at the same time, or are arranged on the side surface at the same time, or are arranged on the first surface and the side surface respectively, or are arranged on the second surface at the same time, or are arranged on the second surface and the side surface respectively.

16. The audio device according to claim 13, characterized in that The third sound outlet hole and the fourth sound outlet hole are arranged on the second surface at the same time, or are arranged on the side surface at the same time, or are arranged on the second surface and the side surface respectively, or are arranged on the first surface at the same time, or are arranged on the first surface or the side surface respectively.

17. The audio device according to claim 13, characterized in that The first surface is provided with a protruding structure, and the first sound outlet hole and the second sound outlet hole are both arranged on the end surface of the protruding structure.

18. The audio device according to claim 1 or 2, characterized in that: The distance between the center points of the first projection area and the third projection area is less than or equal to 15 mm.

19. The audio device according to claim 1 or 2, characterized in that: The line distance between the center points of the projection of the third sound outlet hole on the plane parallel to the vibration direction of the diaphragm of the speaker unit and the projection of the first sound outlet hole on the plane parallel to the vibration direction of the diaphragm of the speaker unit is less than 13 mm.

20. The audio device according to claim 1 or 2, characterized in that: The audio device also includes a hook-shaped band, which is used to wear the audio device on a human ear. The first cavity and the second cavity are both arranged in the sound-emitting part, and the first sound hole, the second sound hole, the third sound hole and the fourth sound hole are all arranged on the outer wall of the sound-emitting part. When the audio device is worn on the ear, the ear canal entrance is taken as the origin, the ear canal entrance is set as the X positive semi-axis outward, the ear canal entrance upward toward the top of the human head is set as the Z positive semi-axis, and the ear canal entrance toward the face is set as the Y positive semi-axis, forming an XYZ coordinate system.

21. The audio device according to claim 20, characterized in that The angle between the line connecting the center points of the first sound outlet hole and the second sound outlet hole and the YZ plane of the XYZ coordinate system is in the range of 25° to 70°, the angle between the line connecting the center points of the first sound outlet hole and the YZ plane of the XYZ coordinate system is less than or equal to 150°, and the angle between the line connecting the center points of the first sound outlet hole and the second sound outlet hole and the YZ plane of the XYZ coordinate system is less than or equal to 150.

22. The audio device according to claim 20, characterized in that An angle between a plane perpendicular to an average normal line of the first sound outlet hole and a YZ plane of an XYZ coordinate system is less than or equal to 40°.

23. The audio device according to claim 20, characterized in that The angle between the connecting line between the center points of the third sound outlet hole and the fourth sound outlet hole and the ZY plane of the XYZ coordinate system is greater than or equal to 40°, the angle between the connecting line and the XY plane of the XYZ coordinate system is less than or equal to 150°, and the angle between the connecting line and the XZ plane of the XYZ coordinate system is less than or equal to 150°.

24. The audio device according to claim 20, characterized in that An angle between a plane perpendicular to an average normal line of the third sound outlet hole and a YZ plane of an XYZ coordinate system is less than or equal to 82°.

25. The audio device according to claim 20, characterized in that The distance between the center points of the projections of the first sound outlet hole and the third sound outlet hole on the YZ plane of the XYZ coordinate system ranges from 3 mm to 7 mm.

26. The audio device according to claim 20, characterized in that The distance between the center points of the projections of the first sound outlet hole and the second sound outlet hole on the YZ plane of the XYZ coordinate system ranges from 4 mm to 8 mm.

27. The audio device according to claim 20, characterized in that The distance between the center points of the projections of the second sound outlet hole and the fourth sound outlet hole on the YZ plane ranges from 4 mm to 8 mm.

28. The audio device according to claim 20, characterized in that The distance between the center points of the projections of the first sound outlet hole and the third sound outlet hole on the XY plane of the XYZ coordinate system ranges from 6 mm to 10 mm.

29. The audio device according to claim 20, characterized in that The distance between the center points of the projections of the second sound outlet hole and the fourth sound outlet hole on the XY plane of the XYZ coordinate system ranges from 6 mm to 10 mm.

30. The audio device according to claim 20, characterized in that The distance between the center points of the projections of the first sound outlet hole and the second sound outlet hole on the XY plane of the XYZ coordinate system ranges from 3 mm to 7 mm.

31. The audio device according to claim 1 or 2, characterized in that: A line connecting the centers of the first sound outlet hole and the third sound outlet hole passes through the diaphragm of the speaker unit, and an angle between the line connecting the centers of the first sound outlet hole and the third sound outlet hole and a plane perpendicular to the vibration direction of the speaker unit is less than or equal to 80°.

32. The audio device according to claim 1 or 2, characterized in that The angle between the center line of the first sound outlet hole and the third sound outlet hole and the plane perpendicular to the average normal line of the first sound outlet hole is in the range of 15° to 75°.

33. The audio device according to claim 1 or 2, characterized in that A line connecting the centers of the second sound outlet hole and the fourth sound outlet hole passes through the diaphragm of the speaker unit, and an angle between the line connecting the centers of the second sound outlet hole and the fourth sound outlet hole and a plane perpendicular to the vibration direction of the speaker unit is less than or equal to 80°.

34. The audio device according to claim 1 or 2, characterized in that The angle between the center line of the second sound outlet hole and the fourth sound outlet hole and the plane perpendicular to the average normal line of the second sound outlet hole is in the range of 15° to 75°.

35. The audio device according to claim 1 or 2, characterized in that The area of ​​the first sound outlet hole is 0.4 to 2.5 times the area of ​​the second sound outlet hole.

36. The audio device according to claim 1 or 2, characterized in that The area of ​​the third sound outlet hole is 0.4 to 2.5 times the area of ​​the fourth sound outlet hole.

37. The audio device according to claim 1 or 2, characterized in that The area of ​​the first sound outlet hole is 0.4 to 2.5 times the area of ​​the third sound outlet hole.

38. The audio device according to claim 1 or 2, characterized in that The area of ​​the second sound outlet hole is 0.4 to 2.5 times the area of ​​the fourth sound outlet hole.

39. The audio device according to claim 1 or 2, characterized in that The first sound outlet hole, the second sound outlet hole, the third sound outlet hole and the fourth sound outlet hole are all provided with a tuning mesh, and the acoustic resistance of the tuning mesh is less than or equal to 9*109 Pa·s / m 3 .

40. The audio device according to claim 1 or 2, characterized in that The volumes of the first cavity and the second cavity are both greater than 0.8 cm 3 .

41. The audio device according to claim 1 or 2, characterized in that The volume of the first cavity is 0.4 to 6 times the volume of the second cavity.

42. The audio device according to claim 1 or 2, characterized in that The distance between the inner surface of the first cavity and the diaphragm in the vibration direction of the speaker unit is less than or equal to 3 mm.

43. The audio device according to any one of claims 7 to 11, characterized in that: The resonant frequency F1 of the first diaphragm and the resonant frequency F2 of the second diaphragm, and the ratio between the resonant frequency F1 and the resonant frequency F2 are in the range of 0.7 to 1.

3.

44. The audio device according to any one of claims 7 to 11, characterized in that: The first diaphragm and the second diaphragm are both provided with a fold ring, and the ratio of the thickness of the fold ring of the second diaphragm to the thickness of the fold ring of the first diaphragm is in the range of 0.88 to 2.

2.

45. The audio device according to any one of claims 7 to 11, characterized in that The internal damping of the second diaphragm is 1.2 to 5 times the internal damping of the first diaphragm.

46. ​​The audio device according to any one of claims 7 to 11, characterized in that: The area of ​​the second diaphragm is 0.8 to 2 times the area of ​​the first diaphragm.

47. The audio device according to any one of claims 7 to 11, characterized in that: The mass of the second diaphragm is 0.1 to 2.2 times the mass of the first diaphragm, and the total mass of the second diaphragm and / or the voice coil attached thereto is 0.1 to 2.2 times the total mass of the first diaphragm and / or the voice coil attached thereto.

48. The audio device according to claim 1, characterized in that The difference between the distances between the center points of the first projection area, the second projection area, the third projection area and the fourth projection area is less than 15 mm; and / or, An included angle between a line connecting the center points of the first projection area and the second projection area and a line connecting the center points of the third projection area and the fourth projection area is in a range of 60° to 90°.

49. The audio device according to claim 1, characterized in that Lines connecting the center points of the projections of the first sound outlet hole, the second sound outlet hole, the third sound outlet hole and the fourth sound outlet hole on a plane perpendicular to the vibration direction of the diaphragm together form a quadrilateral.

50. The audio device according to claim 6, characterized in that The quadrilateral is a parallelogram; and / or, The internal angles of the quadrilateral are all greater than 28°.

51. The audio device according to claim 2, characterized in that The difference between the distance between the center points of the first projection area and the third projection area and the distance between the center points of the second projection area and the third projection area is in the range of 0 mm to 5 mm.

52. The audio device according to claim 2, characterized in that The difference in vertical distances from the center points of the first projection area and the second projection area to the line connecting the center points of the third projection area and the fourth projection area is less than 10 mm.

53. The audio device according to claim 2, characterized in that The distance between the center points of the first sound outlet hole and the third sound outlet hole is less than or equal to 20 mm.

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