Loudspeaker module and AR / VR head-mounted device

Abstract

The utility model relates to the technical field of intelligent visual head-mounted equipment, in particular to a loudspeaker module and AR / VR head-mounted equipment. The loudspeaker module comprises a shell, a loudspeaker assembly and a damping adjusting piece. The shell is internally provided with a sound cavity, and the shell is also provided with a front sound outlet hole and a rear sound outlet hole; the loudspeaker assembly comprises a moving coil unit and a support, the moving coil unit is arranged on the support, the moving coil unit and the support are both located in the sound cavity so that the sound cavity can be divided into a front cavity and a rear cavity, the front sound outlet hole is communicated with the front cavity, the rear sound outlet hole is communicated with the rear cavity, a first through groove is further formed in the support, and the front cavity is communicated with the rear cavity through the first through groove. The damping adjusting piece is arranged at the through groove and used for adjusting the ventilation volume. According to the loudspeaker module, the first through groove and the damping adjusting piece are arranged in the loudspeaker module, so that the pressure of the front cavity is uniformly distributed, the sound quality of the loudspeaker module can be effectively improved, and the user experience is better.

Description

TECHNICAL FIELD

[0001] The utility model relates to intelligent visual head-mounted equipment technical field, especially a loudspeaker module and AR / VR head-mounted equipment. BACKGROUND

[0002] AR / VR head-mounted equipment usually includes wearing main body and loudspeaker unit, the inside of wearing main body is equipped with acoustic cavity, and the loudspeaker unit is installed in the acoustic cavity, so that the acoustic cavity has front cavity and rear cavity that are not connected with each other, and two sound outlets are further provided on the wearing main body, one of which is connected with the front cavity, and the other is connected with the rear cavity; when the user wears the AR / VR head-mounted equipment, the two sound outlets can be connected with the inside of the user's ear canal to realize sound conduction.

[0003] However, in the above structure, since the front cavity and the rear cavity are not connected with each other, when the loudspeaker unit vibrates up and down, there will be a significant pressure difference between the end of the front cavity far away from the sound outlet and the end close to the sound outlet, and the uneven pressure distribution will cause the loudspeaker unit to have a phase difference, thereby affecting the auditory experience. SUMMARY

[0004] The technical problem to be solved by the embodiments of the utility model lies in providing a loudspeaker module to solve the problem that the loudspeaker unit vibrates in the acoustic cavity to cause a pressure difference and thus reduce the auditory experience.

[0005] In a first aspect, the embodiments of the utility model provide a loudspeaker module, which comprises:

[0006] A shell has an acoustic cavity inside, and a front sound outlet and a rear sound outlet are further provided on the shell;

[0007] A loudspeaker assembly comprises a moving coil unit and a bracket, the moving coil unit is installed on the bracket, and the moving coil unit and the bracket are both located in the acoustic cavity to separate the acoustic cavity into a front cavity and a rear cavity, the front sound outlet is connected with the front cavity, the rear sound outlet is connected with the rear cavity, and a first through slot is further provided on the bracket, and the front cavity is connected with the rear cavity through the first through slot;

[0008] A damping adjusting piece is installed at the first through slot, and the damping adjusting piece is used for adjusting the air permeation amount.

[0009] In an embodiment, the first through slot is provided on the side of the bracket far away from the front sound outlet.

[0010] In an embodiment, the front sound outlet and the rear sound outlet are provided on opposite sides of the shell, and the front sound outlet and the rear sound outlet are staggered with each other.

[0011] In an embodiment, the sound cavity comprises a protrusion and a first cavity wall, the protrusion is provided with a groove, the front sound hole communicates with the groove wall, the first cavity wall is arranged towards the groove, the loudspeaker assembly is sealingly mounted at the groove opening, and the loudspeaker assembly and the first cavity wall have a gap space therebetween to separate the front cavity and the rear cavity.

[0012] In an embodiment, the first through groove comprises a first accommodating portion and a second accommodating portion arranged in sequence in the opening direction of the through groove, the outer contour of the first accommodating portion is larger than the outer contour of the second accommodating portion to form a first mounting step, and the damping adjusting member is mounted on the first mounting step.

[0013] In an embodiment, the bracket is provided with a notch towards one side of the groove bottom, the notch comprises a mouth wall opposite to the groove bottom, and the through groove is opened at the mouth wall.

[0014] In an embodiment, the groove comprises a third accommodating portion and a fourth accommodating portion arranged in sequence in the opening direction of the groove, the outer contour of the third accommodating portion is larger than the outer contour of the fourth accommodating portion to form a second mounting step, and the moving coil unit comprises a diaphragm clamped between the bracket and the second mounting step.

[0015] In an embodiment, the bracket is further provided with a second through groove, the second through groove is arranged opposite to the diaphragm, the second through groove is provided with a connecting seat on the groove wall, the loudspeaker module further comprises a fixing member mounted at the connecting seat, the fixing member is provided with a mounting structure towards one side of the diaphragm, and the moving coil unit comprises an electromagnetic coil assembly mounted in the mounting structure and connected with the diaphragm.

[0016] In an embodiment, the damping adjusting member is a nylon mesh cloth, and the acoustic resistance of the damping adjusting member is greater than or equal to 250Ω and less than or equal to 400Ω.

[0017] In a second aspect, the utility model embodiment further provides an AR / VR head-mounted device, which comprises the loudspeaker module described in the above embodiments.

[0018] Compared with the prior art, the loudspeaker module provided by the utility model embodiment has the beneficial effects that: the loudspeaker module of the application is provided with a through groove and a damping adjusting member inside, so that the pressure distribution of the front cavity is uniform, thereby effectively improving the sound quality of the loudspeaker module and providing a better user experience.

[0019] Specifically, the inside of the shell is divided into front cavity and rear cavity by the loudspeaker assembly, the first through slot is arranged on the support of the loudspeaker assembly, the first through slot is arranged to enable the front cavity and the rear cavity to communicate with each other, and the air permeation amount after the front cavity and the rear cavity are communicated is controlled by arranging the damping adjusting member in the first through slot, so that the sound short circuit is avoided, the pressure in the front cavity is maintained in the range of normal demand, the internal pressure in the front cavity is effectively balanced, the sound quality of the loudspeaker module is adjusted, and the sound quality of the loudspeaker module can be at a higher level. BRIEF DESCRIPTION OF DRAWINGS

[0020] The specific implementation of the present application will be further described in detail below in combination with the drawings and examples, and the drawings are as follows:

[0021] Figure 1 is a perspective view of the loudspeaker module provided by the embodiment of the present application;

[0022] Figure 2 is one of the internal schematic views of the loudspeaker module provided by the embodiment of the present application;

[0023] Figure 3 is the second internal schematic view of the loudspeaker module provided by the embodiment of the present application;

[0024] Figure 4 is the exploded schematic view of the loudspeaker module provided by the embodiment of the present application;

[0025] Figure 5 is Figure 4 is the local enlarged view of the A position in the middle;

[0026] Figure 6 is a perspective view of the protruding part of the shell provided by the embodiment of the present application;

[0027] Figure 7 is the exploded schematic view of the shell, diaphragm and loudspeaker assembly provided by the embodiment of the present application;

[0028] Figure 8 is one of the assembly schematic views of the diaphragm and loudspeaker assembly provided by the embodiment of the present application;

[0029] Figure 9 is the exploded schematic view of the diaphragm and loudspeaker assembly provided by the embodiment of the present application;

[0030] Figure 10 is the disconnected sectional view of the loudspeaker module provided by the embodiment of the present application;

[0031] Figure 11 is the second assembly schematic view of the diaphragm and loudspeaker assembly provided by the embodiment of the present application;

[0032] Figure 12is the curve change graph of the internal sound pressure of the loudspeaker under the different acoustic resistance damping adjusting pieces provided by the embodiment of the utility model;

[0033] Figure 13 is the utility model embodiment provides Figure 12 The experimental data table of the sound pressure test under the different acoustic resistance damping adjusting pieces in the middle-low frequency to high frequency interval.

[0034] The reference signs in the drawings are as follows:

[0035] 1000, loudspeaker module;

[0036] 10, shell;11, sound cavity;111, front cavity;112, rear cavity;113, convex part;1131, recess;1131a, third accommodating portion;1131b, fourth accommodating portion;1131c, second mounting step;12, front sound hole;13, rear sound hole;14, hollow shell;15, upper cover;16, connecting lug;

[0037] 20, loudspeaker assembly;21, moving coil unit;211, diaphragm;2111, support plate;212, electromagnetic coil assembly;2121, magnet;2121a, second through hole;2122, coil;22, support;221, first through slot;2211, first accommodating portion;2212, second accommodating portion;2213, first mounting step;222, notch;223, second through slot;2231, connecting seat;2233, fixing seat;2233a, metal guide sheet;23, fixing piece;231, mounting structure;232, base plate;2321, first through hole;233, limiting sheet;

[0038] 30, damping adjusting piece. DETAILED DESCRIPTION

[0039] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0040] The utility model embodiment provides a kind of loudspeaker module 1000, such as Figures 1 to 5As shown, the loudspeaker module 1000 comprises a shell 10, a loudspeaker assembly 20, and a damping adjustment piece 30; the shell 10 has an acoustic cavity 11 inside, and the shell 10 is further provided with a front sound hole 12 and a rear sound hole 13; the loudspeaker assembly 20 comprises a moving coil unit 21 and a support 22, the moving coil unit 21 is mounted on the support 22, and the moving coil unit 21 and the support 22 are both located in the acoustic cavity 11, so as to separate the acoustic cavity 11 into a front cavity 111 and a rear cavity 112, the front sound hole 12 is communicated with the front cavity 111, the rear sound hole 13 is communicated with the rear cavity 112, and the support 22 is further provided with a first through slot 221, the front cavity 111 is communicated with the rear cavity 112 through the first through slot 221; the damping adjustment piece 30 is mounted at the through slot, and the damping adjustment piece 30 is used for adjusting the air permeation amount. The loudspeaker module 1000 of the present application can solve the problem that the loudspeaker unit vibration sound cavity of the AR / VR head-mounted device in the prior art is prone to pressure difference, resulting in a decrease in auditory experience. The loudspeaker module 1000 is provided with the first through slot 221 and the damping adjustment piece 30 inside, so that the pressure distribution of the front cavity 111 is uniform, thereby effectively improving the sound quality of itself, and the user experience is better.

[0041] Specifically, the working principle of the loudspeaker module 1000 is as follows: sound waves are generated by the loudspeaker assembly 20 vibrating in the acoustic cavity 11, the sound waves are output to the outside through the front sound hole 12 and the rear sound hole 13, the first through slot 221 is formed on the support 22, so that the front cavity 111 and the rear cavity 112 are communicated, and the damping adjustment piece 30 is arranged at the first through slot 221, the damping adjustment piece 30 can control the air permeation amount after the front cavity 111 and the rear cavity 112 are communicated, on the one hand, it can prevent the front cavity 111 from being completely communicated with the rear cavity 112, so as to avoid the occurrence of sound short circuit, on the other hand, the gas can be exchanged between the front cavity 111 and the rear cavity 112 according to the demand, so as to effectively maintain the air pressure balance inside the front cavity 111 and the rear cavity 112, so that the front cavity 111 and the rear cavity 112 are within the normal demand range, and the loudspeaker module 1000 is in a stable working state, so that the sound quality of the loudspeaker module 1000 can be at a higher level.

[0042] It is worth mentioning that in order to solve the problem of sound quality decline caused by pressure difference of the acoustic cavity 11 in the prior art, two methods are usually adopted. In method one, an independent tweeter unit is added inside the loudspeaker to ensure the sound quality, which means that relevant costs such as the cost of the tweeter and the cost of the frequency division circuit need to be increased. In method two, the designer directly improves the sound quality through EQ equalization debugging. However, since the peak and valley distribution is generally in the medium and high frequency, the EQ equalization debugging often cannot accurately grasp the peak and valley frequency points, and the debugging effect is not ideal, and the difficulty is extremely high. By implementing the present scheme, the loudspeaker module 1000 directly solves the problem of uneven pressure difference distribution of the acoustic cavity 11 through structural arrangement, which not only saves cost, but also ensures the sound quality effect, and the arrangement is simpler.

[0043] The prior art horn unit is because the front cavity 111 and the rear cavity 112 are not communicated, and the front sound outlet connected with the front cavity 111 is usually provided with a damping gauze, so that when the horn of the horn unit vibrates up and down, a great pressure difference between the end of the front cavity 111 far away from the front sound outlet and the end close to the front sound outlet is caused, the pressure difference causes the imbalance of the vibration of the horn and the difference of the phase, and then causes the problems of the peaks and valleys of the frequency response curve in the medium and high frequency region, and the listening feeling is obviously reduced. In order to solve the technical problem, in an embodiment, the first through slot 221 is arranged on the side of the support 22 far away from the front sound hole 12. In this way, the first through slot 221 is arranged at the position far away from the front sound hole 12, which can effectively improve the pressure difference between the end of the front cavity 111 far away from the front sound outlet and the end close to the front sound outlet, make the pressure of the front cavity 111 evenly distributed, and improve the overall sound quality.

[0044] Referring to Figure 4 In an embodiment, the front sound hole 12 and the rear sound hole 13 are arranged on opposite sides of the shell 10, and the front sound hole 12 and the rear sound hole 13 are staggered with each other. In this way, the mutual interference of the sound output by the front sound hole 12 and the rear sound hole 13 can be reduced, and the possibility of sound distortion can be reduced. Moreover, the front and rear sounds are more clearly separated, and the listening experience is improved.

[0045] Referring to Figure 4 With Figure 10 In an embodiment, the sound cavity 11 includes a protruding part 113 and a first cavity wall, the protruding part 113 is provided with a groove 1131, the front sound hole 12 is connected with the groove wall of the groove 1131, the first cavity wall is arranged towards the groove 1131, the horn assembly 20 is sealingly installed at the slot opening of the groove 1131, and there is a gap space between the horn assembly 20 and the first cavity wall to separate the front cavity 111 and the rear cavity 112. In this way, the protruding part 113 can limit and fix the horn assembly 20 on one hand, and improve the connection stability of the horn assembly 20 and the shell 10. On the other hand, by providing the groove 1131 on the protruding part 113, the groove 1131 is connected with the front sound outlet, the horn assembly 20 sealingly connects the slot opening of the groove 1131, the groove 1131 and the horn assembly 20 together surround the front cavity 111, and the protruding part 113, the horn assembly 20 and the cavity wall of the sound cavity 11 together surround the rear cavity 112, which simplifies the structure, effectively separates the front cavity 111 and the rear cavity 112, ensures that the front cavity 111 and the rear cavity 112 can only be communicated through the first through slot 221, and the overall structure is more reliable.

[0046] Referring to Figure 5In an embodiment, the first through slot 221 comprises a first accommodating portion 2211 and a second accommodating portion 2212 arranged in sequence in the opening direction of the first through slot 221, the outer contour of the first accommodating portion 2211 is larger than that of the second accommodating portion 2212 to form a first mounting step 2213, and the damping adjusting member 30 is mounted on the first mounting step 2213. In this way, the first mounting step 2213 facilitates the positioning and mounting of the damping adjusting member 30, and the first accommodating portion 2211 can limit the movement of the damping adjusting member 30 in the horizontal direction, thereby improving the accuracy of the mounting position of the damping adjusting member 30 and ensuring the accurate alignment of the damping adjusting member 30 and the first through slot 221.

[0047] Preferably, the outer contour of the damping adjusting member 30 is adapted to the outer contour of the first accommodating portion 2211. In this way, the relative position of the damping adjusting member 30 on the first mounting step 2213 is further limited, thereby improving the stability of the connection between the damping adjusting member 30 and the bracket 22.

[0048] Preferably, the damping adjusting member 30 is adhered to the first mounting step 2213, which can reduce the gap between the damping adjusting member 30 and the first through slot 221, ensure the fit of the damping adjusting member 30 and the housing 10, enhance the sealing performance, and does not need to set up a complex structure for mounting, making the installation process more convenient and fast, and reducing the manufacturing cost.

[0049] Referring to Figure 5 In an embodiment, the bracket 22 is provided with a notch 222 on the side of the groove 1131 facing the groove bottom, the notch 222 comprises a mouth wall opposite to the groove bottom of the groove 1131, and the first through slot 221 is arranged at the mouth wall. In this way, the notch 222 can reduce the thickness of the bracket 22 at the position where the first through slot 221 is arranged, while ensuring the overall structural strength of the bracket 22, the depth of the first through slot 221 is reduced, thereby making the path of gas exchange between the front cavity 111 and the rear cavity 112 shorter, effectively improving the exchange efficiency of the gas between the front cavity 111 and the rear cavity 112, and the gas can be exchanged more quickly between the front cavity 111 and the rear cavity 112, making the pressure adjustment between the front cavity 111 and the rear cavity 112 more efficient. Therefore, the response speed is faster when the pressure inside the loudspeaker module 1000 is adjusted.

[0050] It is worth mentioning that the notch 222 cooperates with the side wall adjacent to the notch 222 of the groove 1131 to guide the gas at this position to flow towards the first through slot 221, thereby ensuring the smooth flow of the gas to the required channel, and better achieving the gas exchange and pressure adjustment between the front cavity 111 and the rear cavity 112.

[0051] Referring to Figure 6 With Figure 7In an embodiment, the groove 1131 comprises a third accommodating portion 1131a and a fourth accommodating portion 1131b arranged in sequence in the opening direction of the groove 1131, the outer contour of the third accommodating portion 1131a is larger than the outer contour of the fourth accommodating portion 1131b, so as to form a second mounting step 1131c; the moving coil unit 21 comprises a diaphragm 211 clamped between the support 22 and the second mounting step 1131c. In this way, the arrangement of the second mounting step 1131c not only limits the installation of the support 22, but also cooperates with the support 22 to fix the diaphragm 211, simplifies the structure, and is more convenient to install and has higher assembly efficiency.

[0052] Preferably, the outer contours of the support 22 and the diaphragm 211 are adapted to the outer contour of the third accommodating portion 1131a, so as to improve the limiting of the third accommodating portion 1131a on the support 22 and the diaphragm 211, ensure the stable installation of the support 22 and the diaphragm 211, increase the positional accuracy of assembly, and thus improve the overall structural reliability.

[0053] Referring to Figure 8 - Figure 10 In an embodiment, the support 22 is also provided with a second through slot 223, the second through slot 223 is arranged opposite to the diaphragm 211, and the slot wall of the second through slot 223 is provided with a connecting seat 2231; the loudspeaker module 1000 further comprises a fixing member 23, the fixing member 23 is arranged at the connecting seat 2231, and the side of the fixing member 23 facing the diaphragm 211 is provided with a mounting structure 231; the moving coil unit 21 comprises an electromagnetic coil assembly 212, the electromagnetic coil assembly 212 is arranged in the mounting structure 231 and connected with the diaphragm 211. In this way,

[0054] The electromagnetic coil assembly 212 comprises a magnet 2121 and a coil 2122, the coil 2122 is sleeved outside the magnet 2121, and the magnet 2121 is installed in the mounting structure 231 of the fixing member 23.

[0055] The fixing member 23 comprises a substrate 232 and a plurality of limiting pieces 233, the plurality of limiting pieces 233 are arranged in a circumferential direction of the substrate 232 at intervals, and each limiting piece 233 is bent and connected to the substrate 232, the substrate 232 and the plurality of limiting pieces 233 together enclose the mounting structure 231 for installing the magnet 2121, the substrate 232 provides a mounting surface for the magnet 2121, and the plurality of limiting pieces 233 can limit the relative position of the magnet 2121 and the coil 2122, so as to ensure that the coil 2122 can move in a predetermined direction when moving, and improve the reliability of the overall structure.

[0056] In an embodiment, the second through slot 223 is further provided with a fixing seat 2233 on the slot wall, and a metal guide sheet 2233a is arranged on the fixing seat 2233. The coil 2122 is electrically connected to the metal guide sheet 2233a. The loudspeaker module 1000 further comprises a control circuit board and a conductive wire. The conductive wire is electrically connected to the metal guide sheet 2233a and the control circuit board, respectively. In this way, the control circuit board is connected to the coil 2122 through the lead wire and the metal guide sheet 2233a. Since the control circuit board is arranged separately from the loudspeaker assembly 20, the loudspeaker assembly 20 can be independently installed without worrying about being disturbed by other components. The installation is faster. After the loudspeaker assembly 20 is sealed in the recess 1131, the conductive wire and the metal guide sheet 2233a are connected. This can effectively reduce the possibility of the conductive wire being broken during installation. The metal guide sheet 2233a provides good electrical connection and ensures the stability of the electrical signal transmission, reducing the occurrence of poor connection.

[0057] The control circuit board can deliver current to the coil 2122 through the metal guide sheet 2233a. According to the principle of electromagnetic induction, when the current passes through the coil 2122, a magnetic field is generated around it. This magnetic field interacts with the magnet 2121, thereby generating a force that causes the coil 2122 to move relative to the magnet 2121. This movement drives the diaphragm 211 to vibrate, generating sound waves.

[0058] Preferably, the control circuit board can be arranged outside the shell 10 to reduce the occupation of the internal space of the shell 10.

[0059] Referring to Figure 8 With Figure 9 In an embodiment, the substrate 232 is provided with a first through opening 2321, and the magnet 2121 is provided with a second through opening 2121a that communicates with the first through opening 2321. The second through opening 2121a is arranged towards the diaphragm 211. The rear cavity 112 communicates with the first channel and the second channel. During the vibration of the diaphragm 211, sound waves can be transmitted to the rear cavity 112 through the first through opening 2321 and the second through opening 2121a. In this way, the sound waves generated by the vibration of the diaphragm 211 are not only conducted to the rear cavity 112 through the second through slot 223, but also conducted through the first through opening 2321 and the second through opening 2121a, improving the conduction efficiency of the sound waves and enhancing the sound effect. The propagation of sound in the rear cavity 112 is more efficient, improving the user's auditory experience.

[0060] Referring to Figure 4 In an embodiment, the shell 10 comprises a hollow shell 14 and an upper cover 15. The upper cover 15 is detachably connected to the hollow shell 14. The upper cover 15 and the hollow shell 14 together enclose the sound cavity 11. In this way, by assembling the hollow shell 14 and the upper cover 15, the loudspeaker assembly 20 can be installed inside the shell 10.

[0061] Referring toFigure 1 In an embodiment, the shell 10 is further provided with a connecting lug 16, which can be used to connect with an external component to achieve mounting and fixing of the shell 10. Specifically, the connecting lug 16 is provided with a through hole for a screw to pass through, and the screw is threadedly connected with the external component to achieve detachable connection of the shell 10 to the external component.

[0062] Referring to Figure 12 With Figure 13 In an embodiment, the damping adjustment member 30 is a nylon mesh cloth, and the acoustic resistance of the damping adjustment member 30 is greater than or equal to 250Ω and less than or equal to 400Ω. Figure 12 The continuous curve change diagram of the sound pressure at each sound frequency is set for the values of the acoustic resistance of different damping adjustment members, wherein 0Ω represents that the support is not provided with the first through slot. Figure 13 Then, the detailed data diagram of the sound pressure in the range of 4500-9000HZ under the damping adjustment member 30 with different acoustic resistance is shown. Thus, from the above two tables, it can be concluded that increasing the first through slot 221 and using the damping adjustment member 30 to regulate the air permeability of the front cavity 111 and the rear cavity 112 can reduce the resonance and distortion that may occur in the sound conduction process, effectively improve the problem of frequency response dip in the high frequency range of 5K-7.5KHz; and through careful comparison of the data, it can be known that setting the acoustic resistance of the damping adjustment member 30 in the range of greater than or equal to 250Ω and less than or equal to 400Ω can make the sound pressure stable and balanced during the transition from low frequency to high frequency, so that the sound quality of the loudspeaker module 1000 reaches the best effect.

[0063] Referring to Figure 11 In an embodiment, the diaphragm 211 is further provided with a support plate 2111, which is arranged on the side of the diaphragm 211 away from the electromagnetic coil assembly 212. The support plate 2111 can effectively support the diaphragm 211, improve the structural strength of the diaphragm 211, prevent excessive bending or deformation of the diaphragm 211, and make the diaphragm 211 vibrate more smoothly when the coil 2122 drives the diaphragm 211 to vibrate, so as to improve the performance of the loudspeaker module 1000.

[0064] In an embodiment, the ratio of the cross-sectional area size of the first through slot 221 to the effective vibration cross-sectional area size of the diaphragm 211 is 0.1. Thus, the diaphragm 211 can stably generate sound waves, and to a certain extent, affect the frequency response and damping effect of the sound, optimize the acoustic performance, and improve the sound quality performance.

[0065] The utility model embodiment further provides an AR / VR head-mounted device (not shown in the figure), which comprises the loudspeaker module 1000 of each of the above embodiments. The AR / VR head-mounted device can effectively balance the pressure distribution in the self acoustic cavity 11, and the overall sound quality is obviously improved.

[0066] The AR / VR head-mounted device can be AR / VR glasses or other types of head-mounted devices, which are not limited herein.

[0067] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them. For those skilled in the art, the technical solutions recorded in the above embodiments can be modified, or some technical features can be replaced by equivalents. All these modifications and replacements shall fall within the protection scope of the appended claims of the present application.

Claims

1. A loudspeaker module, characterized by The loudspeaker module comprises: a shell having an acoustic cavity inside, the shell being further provided with a front sound hole and a rear sound hole; a loudspeaker assembly comprising a moving coil unit and a bracket, the moving coil unit being mounted on the bracket, and the moving coil unit and the bracket being located in the acoustic cavity to divide the acoustic cavity into a front cavity and a rear cavity, the front sound hole being communicated with the front cavity, the rear sound hole being communicated with the rear cavity, the bracket being further provided with a first through slot, the front cavity being communicated with the rear cavity through the first through slot; a damping adjustment member mounted at the first through slot, the damping adjustment member being used for adjusting the air permeation amount.

2. The horn module of claim 1, wherein, The first through slot is arranged on a side of the bracket away from the front sound hole.

3. The horn module of claim 2, wherein, The front sound hole and the rear sound hole are arranged on opposite sides of the shell, and the front sound hole and the rear sound hole are staggered with each other.

4. The horn module of claim 1, wherein, The acoustic cavity comprises a protruding portion and a first cavity wall, the protruding portion being provided with a groove, the front sound hole being communicated with a groove wall of the groove, the first cavity wall being arranged towards the groove, the loudspeaker assembly being sealingly mounted at a groove opening of the groove, and the loudspeaker assembly and the first cavity wall having a gap space therebetween to divide the front cavity and the rear cavity.

5. The horn module of claim 4, wherein, The first through slot comprises a first accommodating portion and a second accommodating portion arranged in sequence in an opening direction of the first through slot, an outer contour of the first accommodating portion being larger than an outer contour of the second accommodating portion to form a first mounting step, the damping adjustment member being mounted on the first mounting step.

6. The horn module of claim 4 or 5, wherein, The bracket is provided with a notch towards a side of the groove bottom, the notch comprising a mouth wall opposite to the groove bottom, the through slot being arranged at the mouth wall.

7. The horn module of claim 6, wherein, The groove comprises a third accommodating portion and a fourth accommodating portion arranged in sequence in an opening direction of the groove, an outer contour of the third accommodating portion being larger than an outer contour of the fourth accommodating portion to form a second mounting step; the moving coil unit comprises a diaphragm, the diaphragm being clamped between the bracket and the second mounting step.

8. The horn module of claim 7, wherein, The bracket is further provided with a second through slot, the second through slot being arranged opposite to the diaphragm, the second through slot being provided with a connecting seat on a slot wall thereof; the loudspeaker module further comprises a fixing member, the fixing member being mounted at the connecting seat, a side of the fixing member towards the diaphragm being provided with a mounting structure; the moving coil unit comprises an electromagnetic coil assembly, the electromagnetic coil assembly being mounted in the mounting structure and connected with the diaphragm.

9. The horn module of claim 1, wherein, The damping adjustment member is a nylon mesh cloth, an acoustic resistance of the damping adjustment member being greater than or equal to 250Ω and less than or equal to 400Ω.

10. An AR / VR headset, comprising: The loudspeaker module comprises the loudspeaker module according to any one of claims 1-9.

Images