Speaker modules and electronic devices

Abstract

The present application provides a speaker module and an electronic device, which relates to the technical field of electronic products and can improve the low-frequency performance of the speaker module. The speaker module includes a shell and a core. The shell includes a top wall, a first side wall and a second side wall, the first side wall and the second side wall are respectively connected to two opposite edges of the top wall, and the first side wall is provided with a sound outlet. The core is arranged between the first side wall and the second side wall, and the core includes a diaphragm, the diaphragm is parallel to the top wall or inclined relative to the top wall, and a front cavity is provided on one side of the diaphragm, and the front cavity is connected to the sound outlet; the rear cavity of the speaker module is arranged between the core and the first side wall.

Description

Technical Field

[0001] The present application relates to the technical field of electronic products, and in particular to a speaker module and an electronic device. Background Art

[0002] Electronic devices such as mobile phones, tablet computers and laptops have speaker modules that are used to convert audio electrical signals into sound signals for output.

[0003] When using electronic devices, the low-frequency performance of the speaker module is crucial to the user experience. The better the low-frequency performance, the better the sound quality and the better the user experience. In the prior art, the low-frequency performance of the speaker module is usually improved by increasing the physical volume of the rear cavity of the speaker module or filling the rear cavity with sound-absorbing materials. However, under the premise that the external dimensions of the electronic device and the speaker module are certain, the low-frequency performance that can be improved by these methods is limited and the low-frequency performance cannot be further optimized. Summary of the invention

[0004] The present application provides a speaker module and an electronic device, which can improve the low-frequency performance of the speaker module.

[0005] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0006] In a first aspect, a speaker module is provided, the speaker module comprising a shell and a core.

[0007] The shell comprises a top wall, a first side wall and a second side wall. The first side wall and the second side wall are respectively connected to two opposite edges of the top wall. The first side wall is provided with a sound outlet.

[0008] The inner core is arranged between the first side wall and the second side wall, and the inner core includes a diaphragm, which is parallel to the top wall or inclined relative to the top wall, and a front cavity is arranged on one side of the diaphragm, and the front cavity is connected to the sound outlet hole. Specifically, the front cavity is connected to the sound outlet hole by a sound outlet channel, and the front cavity, the sound outlet hole and the sound outlet channel are connected to form a front sound cavity of the speaker module. The rear cavity of the speaker module is arranged between the inner core and the first side wall.

[0009] In this way, the distance from the inner core to the sound outlet hole on the first side wall is longer, and the path of the sound outlet channel is longer. Under the premise that the volume of the front sound cavity and the cross-sectional area of ​​the sound outlet channel are constant, the mass of the vibration system formed by the speaker module can be increased. Furthermore, under the premise that the compliance of the speaker module is constant, the resonance frequency can be reduced, which is conducive to improving the low-frequency performance of the speaker module, and improving the low-frequency sensitivity and loudness of the speaker module.

[0010] Optionally, at least a portion of the first side wall forms a side wall of the rear cavity.

[0011] In this way, the direction from the first side wall to the second side wall is defined as the second direction, and the two ends of the rear cavity in the second direction are respectively the first end and the second end. Based on this, since at least a part of the first side wall forms the side wall of the rear cavity, the sound outlet channel and the rear cavity are stacked in the height direction of the speaker module, and the two ends of the sound outlet channel are respectively aligned with the first end and the second end of the rear cavity, thereby reducing the size of the speaker module along the second direction, which is beneficial to the installation of the speaker module in an electronic device with limited internal space.

[0012] Optionally, a first sound outlet channel is provided between the front cavity and the sound outlet hole. One end of the first sound outlet channel is connected to the front cavity, and the other end extends toward and is connected to the sound outlet hole. The first sound outlet channel extends approximately in a straight line, and this structure is simple and has better airflow smoothness.

[0013] Optionally, a second sound outlet channel is further provided between the front cavity and the sound outlet hole. One end of the second sound outlet channel is connected to the front cavity, and the other end extends toward the sound outlet hole and is connected to the sound outlet hole. The second sound outlet channel and the first sound outlet channel are arranged at intervals along a first direction. The first direction is perpendicular to the length direction of the first sound outlet channel and parallel to the top wall.

[0014] In this way, there are more sound output channels, the sound output is smoother and more uniform, and the sound effect is better.

[0015] Optionally, the sum of the width of the first sound outlet channel in the first direction and the width of the second sound outlet channel in the first direction is greater than or equal to 0.4 times the width of the front cavity in the first direction. In this way, when the core is working, the airflow in the front cavity moves smoothly to the sound outlet channel, which can avoid the generation of vortices and improve the sound quality.

[0016] Optionally, the sum of the width of the first sound outlet channel in the first direction and the width of the second sound outlet channel in the first direction is less than or equal to 0.6 times the width of the front cavity in the first direction. In this way, while ensuring the smoothness of the airflow, the sum of the widths of the first sound outlet channel and the second sound outlet channel is small, the sum of the cross-sectional area of ​​the first sound outlet channel and the cross-sectional area of ​​the second sound outlet channel is small, the volume of the sound outlet channel is small, and the volume of the front sound cavity is small, which can increase the mass of the vibration system in the speaker module and improve the low-frequency performance. In addition, the volume of the front sound cavity is small, so under the premise that the external dimensions of the speaker module are certain, the physical space of the rear cavity can be increased, which is conducive to improving the compliance of the system and further improving the low-frequency performance.

[0017] Optionally, the width of the first sound outlet channel in the first direction may be equal to the width of the second sound outlet channel in the first direction, which can ensure the uniformity of the acoustic load and reduce the difficulty of design.

[0018] Optionally, the shell also includes a bottom wall. The bottom wall is opposite to the top wall and is spaced apart, and the bottom wall is connected between the first side wall and the second side wall. The inner core is located between the top wall and the bottom wall, the top wall is provided with a through hole, the diaphragm is opposite to the through hole, and the inner area of ​​the through hole forms a front cavity. The top wall, the first side wall, the inner core and the bottom wall form a rear cavity. Thus, the front cavity is arranged on the top wall, which will not occupy the internal space of the shell, which is conducive to increasing the physical space of the rear cavity in the shell, improving the compliance of the system, and ensuring low-frequency performance. In addition, since the top wall, the first side wall, the inner core and the bottom wall form the rear cavity, the space of the rear cavity is relatively large, which is conducive to improving the compliance of the system and ensuring low-frequency performance.

[0019] Optionally, the rear cavity, the space occupied by some structures in the inner core except the diaphragm, and part of the space in the shell on a side of the inner core facing away from the rear cavity are connected to form a rear acoustic cavity.

[0020] Optionally, a first groove and a second groove are provided on the surface of the top wall facing away from the bottom wall. One end of the first groove is connected to the through hole, and the other end extends toward the sound outlet hole and is connected to the sound outlet hole. One end of the second groove is connected to the through hole, and the other end extends toward the sound outlet hole and is connected to the sound outlet hole. The first groove and the second groove are arranged at intervals along the first direction, and the internal space of the first groove forms a first sound outlet channel, and the internal space of the second groove forms a second sound outlet channel. In this way, the first sound outlet channel and the second sound outlet channel are arranged on the outer surface of the top wall, and will not occupy the internal space of the shell, so that all the space in the shell can be used to form a rear sound cavity, which can increase the volume of the rear sound cavity and is conducive to ensuring low-frequency performance.

[0021] Optionally, the portion of the top wall between the first groove and the second groove is the middle portion. A third groove is provided on the surface of the middle portion facing the bottom wall. The inner space of the third groove forms a part of the rear cavity, so that the space of the rear cavity can be expanded, and while extending the length of the sound outlet channel and reducing the cross-sectional area of ​​the sound outlet channel, the volume size of the rear cavity can be guaranteed to be unchanged to a certain extent, thereby improving the quality of the vibration system and improving the low-frequency performance.

[0022] Optionally, the front cavity includes a first inner surface and a second inner surface opposite to each other along a first direction. The inner wall surface of the first sound outlet channel away from the second sound outlet channel is the first inner wall surface, and the inner wall surface of the second sound outlet channel away from the first sound outlet channel is the second inner wall surface. In the first direction, the first inner wall surface and the second inner wall surface are located between the first inner surface and the second inner surface, and the distance from the first inner surface to the first inner wall surface and the distance from the second inner surface to the second inner wall surface are both less than or equal to 0.1 times the width of the front cavity in the first direction. In this way, the first sound outlet channel and the second sound outlet channel are respectively connected to the two end spaces of the front cavity in the first direction, which can improve the smoothness of the airflow, reduce vortices, and ensure the sound quality.

[0023] Optionally, the front cavity includes a first inner surface and a second inner surface opposite to each other along a first direction. The inner wall surface of the first sound outlet channel away from the second sound outlet channel is the first inner wall surface, and the inner wall surface of the second sound outlet channel away from the first sound outlet channel is the second inner wall surface. The first inner surface is coplanar with the first inner wall surface, and the second inner surface is coplanar with the second inner wall surface. In this way, there is no step difference between the first inner wall surface and the first inner surface, and between the second inner wall surface and the second inner surface, which can further improve the smoothness of the airflow, reduce vortices, and ensure sound quality.

[0024] Optionally, the front cavity further includes a third inner surface, the third inner surface is connected between the first inner surface and the second inner surface, and the opening at one end of the first sound outlet channel connected to the front cavity and the opening at one end of the second sound outlet channel connected to the front cavity are both located on the third inner surface. A first notch is provided at a position of the third inner surface corresponding to the first sound outlet channel, and a second notch is provided at a position of the third inner surface corresponding to the second sound outlet channel. With the help of the first notch and the second notch, the cross-sectional area at the junction of the front cavity and the first sound outlet channel and the junction of the front cavity and the second sound outlet channel can be increased, which can improve the smoothness of the airflow, reduce vortices, and ensure the sound quality.

[0025] Optionally, the bottom surface of the first sound outlet channel includes a first plane area and a first inclined area. The first plane area is parallel to the bottom wall. The first inclined area is connected between the first plane area and the sound outlet hole, and from the first plane area to the sound outlet hole, the first inclined area is inclined toward the bottom wall. By guiding the airflow with the help of the first inclined area, the airflow in the first sound outlet channel where the first plane area is located can be introduced into the sound outlet hole, which can improve the smoothness of the airflow, reduce vortices, and ensure sound quality.

[0026] Optionally, a partition rib is provided in the sound outlet hole, and the sound outlet hole is divided into a first sound outlet hole portion and a second sound outlet hole portion by the partition rib, and the first sound outlet hole portion and the second sound outlet hole portion are arranged along the first direction. The first sound outlet channel is connected to the first sound outlet hole portion, and the second sound outlet channel is connected to the second sound outlet hole portion. In this way, the airflow from the first sound outlet channel can be separated from the airflow from the second sound outlet channel by the partition rib, so as to avoid the two parts of the airflow from impacting each other in the sound outlet hole, thereby reducing vortex and avoiding noise.

[0027] Optionally, the first sound outlet channel includes a first equal width section and a first flared section, the first flared section is connected between the first equal width section and the first sound outlet hole portion, and the width of the first flared section in the first direction gradually increases from the first equal width section to the first sound outlet hole portion. With the help of the first flared section, a smooth transition from the first equal width section to the first sound outlet hole portion can be achieved, the smoothness of the airflow of the first sound outlet channel 331 is improved, the vortex is reduced, and the sound quality is guaranteed.

[0028] In a second aspect, an electronic device is provided, the electronic device comprising a screen, a back shell and a speaker module as described in any of the above technical solutions. The screen is connected to the back shell, the speaker module is arranged between the screen and the back shell, and a sound outlet hole is provided on the back shell, and the sound outlet hole of the speaker module is opposite to the sound outlet hole.

[0029] Since the electronic device provided in the present application includes a speaker module as described in any of the above technical solutions, both can solve the same problem and achieve the same effect.

[0030] Optionally, the electronic device may be a tablet computer, a television, or an all-in-one computer. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A perspective view of an electronic device provided for some embodiments of the present application;

[0032] Figure 2 for Figure 1 a schematic diagram of the exploded structure of the electronic device shown;

[0033] Figure 3 for Figure 2 A stereoscopic view of a speaker module in the electronic device shown;

[0034] Figure 4 for Figure 3 A schematic diagram of the exploded structure of the speaker module shown;

[0035] Figure 5 for Figure 3 The schematic diagram of the cross-sectional structure of the speaker module shown is along the AA direction;

[0036] Figure 6 for Figure 2 Another stereoscopic view of a speaker module in the electronic device shown;

[0037] Figure 7 for Figure 6 A schematic diagram of the exploded structure of the speaker module shown;

[0038] Figure 8 for Figure 6 A three-dimensional cross-sectional view of the loudspeaker module along the BB direction;

[0039] Fig. 9 for Figure 6-Figure 8 A three-dimensional image of the core in the speaker module shown;

[0040] Fig.10 for Fig. 9 A three-dimensional cross-sectional view of the inner core along the CC direction;

[0041] Fig.11 for Figure 7A stereoscopic view of the front housing of the speaker module shown;

[0042] Fig.12 for Figure 7 Another stereoscopic view of the front housing of the speaker module shown;

[0043] Fig.13 for Figure 7 The structure diagram of the speaker module shown is when viewed from direction F;

[0044] Fig.14 for Figure 6-Figure 8 The speaker module shown is used in Figure 1 and Figure 2 A cross-sectional view of the electronic device shown;

[0045] Fig.15 for Figure 3-Figure 5 The schematic diagram of airflow distribution in the front cavity and the sound outlet channel of the speaker module at the first moment during operation is shown;

[0046] Fig.16 for Figure 6-Figure 8 A schematic diagram of airflow distribution in the front cavity and the sound outlet channel of the speaker module at the second moment during operation;

[0047] Fig.17 The sensitivity of the speaker module shown in Scheme 1 and the sensitivity of the speaker module shown in Scheme 2 vary with frequency;

[0048] Fig.18 The electrical impedance of the speaker module shown in the first solution and the electrical impedance of the speaker module shown in the second solution vary with frequency;

[0049] Fig.19 The sensitivity of the speaker module shown in the first solution and the sensitivity of the speaker module shown in the second solution vary with frequency;

[0050] Fig. 20 A curve diagram showing changes in sensitivity of an electronic device including the speaker module shown in Solution 1 and an electronic device including the speaker module shown in Solution 2 as a function of frequency;

[0051] Fig.21 Schematic diagram of the cross-sectional structure of a speaker module provided in some other embodiments of the present application. DETAILED DESCRIPTION

[0052] In the embodiments of the present application, the terms "first", "second", "third", and "fourth" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", "third", and "fourth" may explicitly or implicitly include one or more of the features.

[0053] In the embodiments of the present application, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0054] In the embodiments of the present application, unless otherwise specified, the description "parallel" means approximately parallel within a certain error range, and the error range may be a range of less than or equal to 5° relative to the absolute parallel deviation angle. The description "perpendicular" means approximately perpendicular within a certain error range, and the error range may be a range of less than or equal to 5° relative to the absolute perpendicular deviation angle.

[0055] The present application provides an electronic device, which is a type of device with a speaker module that can convert an audio electrical signal into a sound signal. Specifically, the electronic device can be a user equipment (UE) or a terminal device (terminal), for example, the electronic device can be a tablet computer (portable android device, PAD), a laptop computer, a television, an all-in-one machine, a personal digital assistant (personal digital assistant, PDA), a handheld device with wireless communication function, a computing device, a vehicle-mounted device, a smart wearable device, a service robot, a wireless terminal in self-driving, a wireless terminal in remote medical, a wireless terminal in a smart city, a wireless terminal in a smart home, and other mobile terminals or fixed terminals. The following embodiments are exemplified by using the electronic device as a tablet computer, which cannot be considered as a special limitation on the present application.

[0056] See also Figure 1 and Figure 2 , Figure 1 A perspective view of an electronic device 10 provided in some embodiments of the present application, Figure 2for Figure 1 The schematic diagram of the exploded structure of the electronic device 10 is shown. The electronic device 10 is approximately in the shape of a rectangular flat plate. Based on this, in order to facilitate the description of each embodiment below, an XYZ coordinate system is established, and the length direction of the electronic device 10 is defined as the X-axis direction, the width direction of the electronic device 10 is defined as the Y-axis direction, and the thickness direction of the electronic device 10 is defined as the Z-axis direction. It can be understood that the coordinate system setting of the electronic device 10 can be flexibly set according to actual needs, and no specific limitation is made here. In some other embodiments, the shape of the electronic device 10 can also be a square flat plate, a circular flat plate, an elliptical flat plate, etc.

[0057] The electronic device 10 includes a screen 1 , a back shell 2 and a speaker module 3 .

[0058] The screen 1 is used to display videos or images. The screen 1 can be an organic light-emitting diode (OLED) screen, a micro organic light-emitting diode (micro organic light-emitting diode) screen, a quantum dot light emitting diode (QLED) screen, a liquid crystal display (LCD), etc.

[0059] The screen 1 has a display surface, which is exposed to present the above-mentioned video or image to the user.

[0060] The back shell 2 is connected to the screen 1 and is used to protect the internal components of the electronic device 10. Specifically, the back shell 2 includes a back cover 21 and a frame 22. The back cover 21 is located on the side of the screen 1 that is opposite to the display surface, and the back cover 21 is spaced apart from the screen 1. The frame 22 is arranged at the edge of the back cover 21, and the frame 22 and the back cover 21 can be an integral structural member, or the frame 22 and the back cover 21 can be glued and fixed. The screen 1 can be glued and fixed to the frame 22.

[0061] The speaker module 3 is disposed between the screen 1 and the back shell 2. The speaker module 3 has a sound outlet H. The back shell 2 has a sound outlet h. The sound outlet H is opposite to the sound outlet h. The sound signal generated by the speaker module 3 can be transmitted to the user through the sound outlet H and the sound outlet h.

[0062] In some embodiments, please refer to Figure 1 and Figure 2 , the sound hole H may face the frame 22, and the sound hole h may be disposed on the frame 22 at a position opposite to the sound hole H. In some other embodiments, the sound hole H may also face the back cover 21, and the sound hole h may also be disposed on the back cover 21 at a position opposite to the sound hole H, which is not specifically limited in the present application.

[0063] The speaker module 3 is used to convert the audio electrical signal into a sound signal for output. Figure 2 In the illustrated embodiment, the speaker module 3 is roughly in the shape of a rectangular flat plate, and specifically, the length direction of the speaker module 3 is consistent with the Y-axis direction, the width direction of the speaker module 3 is consistent with the X-axis direction, and the thickness direction of the speaker module 3 is consistent with the Z-axis direction. In some other embodiments, the shape of the speaker module 3 may also be a square flat plate, a circular flat plate, an elliptical flat plate, etc.

[0064] See also Figure 3-Figure 5 , Figure 3 for Figure 2 A stereoscopic view of the speaker module 3 in the electronic device 10 is shown. Figure 4 for Figure 3 The schematic diagram of the exploded structure of the speaker module 3 is shown. Figure 5 for Figure 3 The cross-sectional structure diagram of the speaker module 3 along the AA direction is shown. In this embodiment, the speaker module 3 includes a shell 31 and a core 32.

[0065] The shell 31 is used to protect the core 32 and together with the core 32 form a front sound cavity and a rear sound cavity of the speaker module 3 to achieve the conversion of audio electrical signals into sound signals.

[0066] The housing 31 includes a front shell K1 and a rear cover K2 .

[0067] The front housing K1 includes a top wall 31a and a side frame disposed around the top wall 31a. The top wall 31a is provided with a through hole 34. The side frame includes a first side wall 31b and a second side wall 31c opposite to each other. The sound outlet H is disposed on the first side wall 31b.

[0068] The rear cover K2 is disposed at an opening of the side frame that is away from the top wall 31 a.

[0069] The inner core 32 is disposed between the front shell K1 and the rear cover K2, and the inner core 32 includes a diaphragm 322, and the diaphragm 322 faces the through hole 34. The inner area of ​​the through hole 34 forms a front cavity Q1.

[0070] A sound outlet channel 33 is provided between the front cavity Q1 and the sound outlet hole H, one end of the sound outlet channel 33 is connected to the front cavity Q1, and the other end extends to and is connected to the sound outlet hole H. The front cavity Q1, the sound outlet channel 33 and the sound outlet hole H are connected to form the front sound cavity of the speaker module 3.

[0071] Please refer to Figure 5 The inner core 32 , the front shell K1 and the rear cover K2 form a rear cavity Q2 of the loudspeaker module 3 , and the rear cavity Q2 is located on a side of the inner core 32 that is away from the first side wall 31 b .

[0072] The back cavity Q2, the space occupied by other components in the core 32 except the diaphragm 322, and the partial cavity Q3 in the shell 31 located in the core 32 and facing away from the back cavity Q2 form the back cavity of the speaker module 3. The back cavity Q2 is the largest cavity located on the peripheral side of the core 32 in the back cavity.

[0073] When the inner core 32 is working, the diaphragm 322 vibrates, which can drive the air in the front sound cavity to vibrate to form a sound signal, which is output from the sound outlet H.

[0074] The resonance frequency F0 of the speaker module 3 can be approximately expressed as: C M and M M The larger the value is, the smaller the resonant frequency F0 is, and the better the low-frequency performance (specifically, the low-frequency sensitivity and loudness) is.

[0075] Among them, C M C is the compliance of the vibration system, and its value is related to the physical volume of the rear acoustic cavity, the structural form of the core 32, and whether the rear acoustic cavity is filled with sound-absorbing materials. Specifically, under the premise that the structural form of the core 32 is constant, the larger the physical volume of the rear acoustic cavity, the greater the value of C. M The larger the value, the larger the equivalent space of the rear acoustic cavity is when filled with sound-absorbing materials. M Larger value.

[0076] M M M is the mass of the vibration system, and its value is related to the volume of the front sound cavity, the length of the sound outlet channel 33, and the cross-sectional area of ​​the sound outlet channel 33. Specifically, the smaller the volume of the front sound cavity, the longer the length of the sound outlet channel 33, and the smaller the cross-sectional area of ​​the sound outlet channel 33, the greater the value of M. M The larger the value.

[0077] Because in Figure 3-Figure 5 In the embodiment shown, please refer to Figure 5 , the rear cavity Q2 is located on the side of the core 32 facing away from the first side wall 31b, that is, the rear cavity Q2 is located between the core 32 and the second side wall 31c, and because the rear cavity Q2 is the largest part of the cavity in the rear sound cavity located on the peripheral side of the core 32. In this way, the distance between the core 32 and the sound outlet hole H on the first side wall 31b is relatively close, and the length L of the sound outlet channel 33 is relatively short. Under the premise that the external dimensions of the speaker module 3 are certain, the volume occupied by the sound outlet channel 33 in the speaker module 3 is relatively small, which can increase the physical volume of the rear sound cavity, and is conducive to improving the compliance C of the speaker module 3. M However, due to the short length L of the sound outlet channel 33, the mass M of the speaker module 3 is M It is relatively low, and therefore the low-frequency performance of the speaker module 3 cannot be further improved.

[0078] To solve the above problems, see Figure 6-Figure 8 , Figure 6 for Figure 2 Another stereoscopic view of the speaker module 3 in the electronic device 10 is shown. Figure 7 for Figure 6 The schematic diagram of the exploded structure of the speaker module 3 is shown. Figure 8 for Figure 6 The speaker module 3 is a three-dimensional cross-sectional view along the BB direction. In this embodiment, the speaker module 3 is also roughly in the shape of a rectangular flat plate. Specifically, the length direction of the speaker module 3 is consistent with the Y-axis direction, the width direction of the speaker module 3 is consistent with the X-axis direction, and the thickness direction of the speaker module 3 is consistent with the Z-axis direction. In some other embodiments, the shape of the speaker module 3 can also be a square flat plate, a circular flat plate, an elliptical flat plate, etc.

[0079] The speaker module 3 also includes a shell 31 and a core 32 .

[0080] The shell 31 is used to protect the core 32 and to enclose a front sound cavity and a rear sound cavity together with the core 32 to achieve the conversion of audio electrical signals into sound signals.

[0081] The material of the housing 31 can be non-metallic materials such as polycarbonate (PC), PC+glass fiber, ABS plastic (acrylonitrile butadiene styrene plastic), etc.

[0082] Of course, in some other embodiments, the material of the housing 31 may also be iron, copper, aluminum, stainless steel, copper alloy, aluminum alloy, magnesium aluminum alloy, titanium alloy, etc. This application does not make any specific limitation on this.

[0083] Please refer to Figure 7 The housing 31 includes a front shell K1 and a rear cover K2.

[0084] The front housing K1 includes a top wall 31a and a side frame arranged around the top wall 31a. The top wall 31a is provided with a through hole 34, and the shape of the through hole 34 includes but is not limited to a rectangle, a circle, an ellipse, a square, a polygon, etc. This embodiment and the following embodiments are exemplified by taking the shape of the through hole 34 as a rectangle.

[0085] The side frame includes a first side wall 31b and a second side wall 31c, and a third side wall 31d and a fourth side wall 31e. The first side wall 31b and the second side wall 31c are connected to two opposite edges of the top wall 31a, respectively, and the third side wall 31d and the fourth side wall 31e are connected to the other two opposite edges of the top wall 31a, respectively. The first side wall 31b, the third side wall 31d, the second side wall 31c, and the fourth side wall 31e are connected end to end in sequence to form a frame-like structure.

[0086] The side frame and the top wall 31a may be integrally formed, or may be assembled and connected by gluing, etc. This embodiment and the following embodiments are exemplified by the side frame and the top wall 31a being integrally formed.

[0087] The sound outlet H may be disposed on the first side wall 31b. Figure 7 The portion of the first side wall 31b where the sound outlet H is located may be inclined relative to the top wall 31a. Specifically, the portion of the first side wall 31b is inclined from one end connected to the top wall 31a to one end facing away from the top wall 31a, in a direction away from the second side wall 31c.

[0088] In this way, the outer surface of the portion of the first side wall 31b where the sound hole H is located is a slope. When the speaker module 3 is installed in the electronic device 10, the outer surface of the portion of the first side wall 31b where the sound hole H is located can be fitted with the inner surface of the portion of the frame 22 where the sound hole h is located, so as to reduce the difficulty of installing and positioning the speaker module 3 in the back shell 2.

[0089] In some other embodiments, the portion of the first side wall 31 b where the sound outlet hole H is located may also be perpendicular to the top wall 31 a , which is not specifically limited in the present application.

[0090] In some embodiments, please refer to Figure 8 , the second side wall 31c may include a first side wall portion 31c1, a second side wall portion 31c2, and a third side wall portion 31c3.

[0091] The first side wall portion 31c1 and the first side wall 31b are located on the same side of the top wall 31a, and one end of the first side wall portion 31c1 is connected to the top wall 31a. One end of the second side wall portion 31c2 is connected to the end of the first side wall portion 31c1 that is away from the top wall 31a, and the other end extends in a direction away from the first side wall 31b. One end of the third side wall portion 31c3 is connected to the end of the second side wall portion 31c2 that is away from the first side wall 31b, and the other end extends in a direction away from the top wall 31a.

[0092] In this way, the second side wall 31c is in the shape of a stepped plate. The stepped plate structure in the angle area Qj between the outer surface of the first side wall part 31c1 and the outer surface of the second side wall part 31c2 can avoid other surrounding components, thereby improving the compactness of the internal structure of the electronic device and reducing the external size of the electronic device.

[0093] In some other embodiments, the second side wall 31c may also be in the shape of a flat plate, and the flat plate-shaped structure may be perpendicular to the top wall 31a or may be inclined relative to the top wall 31a, which is not specifically limited here.

[0094] Please continue reading Figure 8 The rear cover K2 is disposed at an opening of the side frame at one end facing away from the top wall 31a. The rear cover K2 may include a bottom wall 31f and a connecting ridge disposed at an edge of the bottom wall 31f.

[0095] The rear cover K2 can be fixedly connected to the side frame of the front shell K1 by means of the connecting ridge. Specifically, the connecting ridge and the side frame can be fixedly connected by gluing, clamping, threading, etc. In some other embodiments, when the material of the shell 31 is metal, the connecting ridge and the side frame can be fixedly connected by welding.

[0096] The core 32 is a core component for generating sound signals in the speaker module 3 .

[0097] See also Fig. 9 and Fig.10 , Fig. 9 for Figure 6-Figure 8 The stereogram of the core 32 in the speaker module 3 is shown. Fig.10 for Fig. 9 The core 32 is a three-dimensional cross-sectional view along the CC direction. The core 32 is generally in the shape of a rectangular plate, the length direction of the core 32 is consistent with the Y-axis direction, the width direction of the core 32 is consistent with the X-axis direction, and the thickness direction of the core 32 is consistent with the Z-axis direction.

[0098] The core 32 may include a basket 321 , a diaphragm 322 and a driving assembly 323 .

[0099] The diaphragm 322 is supported on the basin frame 321. The diaphragm 322 may include a dome 322a and a diaphragm body 322b connected between the dome 322a and the basin frame 321. The dome 322a may be in the shape of a flat plate or a convex spherical sheet. In this embodiment, the dome 322a is in the shape of a flat plate for illustrative purposes. The diaphragm body 322b may include a folded ring 322b1 arranged around the dome 322a. The cross-sectional shape of the folded ring 322b1 is arc-shaped or approximately arc-shaped, and the folded ring 322b1 may be arched in a direction away from the driving assembly 323, or may be arched in a direction close to the driving assembly 323. Fig. 9 and Fig.10 The folded ring 322b1 is arched in the direction away from the driving assembly 323 for exemplary description, which cannot be regarded as a special limitation of the present application. The folded ring 322b1 can be deformed when subjected to external force, so that the ball top 322a can vibrate in the Z-axis direction relative to the basin frame 321. The driving assembly 323 is connected between the ball top 322a and the basin frame 321, and the driving assembly 323 is used to drive the ball top 322a to vibrate in the Z-axis direction relative to the basin frame 321.

[0100] In some embodiments, please refer to Fig.10The driving assembly 323 may include a voice coil 323a and a magnetic circuit system 323b. The voice coil 323a is disposed on the dome 322a, and the magnetic circuit system 323b is disposed on the frame 321. When an alternating current is supplied to the voice coil 323a, the voice coil 323a cooperates with the magnetic circuit system 323b to drive the dome 322a to vibrate in the Z-axis direction relative to the frame 321.

[0101] The drive assembly 323 is a moving coil drive assembly with a simple structure and high vibration stability. Of course, the drive assembly 323 can also have other structural forms, such as an electrostatic drive assembly, an electromagnetic drive assembly or a piezoelectric drive assembly, which is not specifically limited in this application.

[0102] Based on the above, please refer back to Figure 6-Figure 8 The inner core 32 is disposed in the shell 31 , that is, the inner core 32 is located between the top wall 31 a and the bottom wall 31 f , and between the first side wall 31 b and the second side wall 31 c .

[0103] The diaphragm 322 of the core 32 may be parallel to the top wall 31a. In some other embodiments, the diaphragm 322 may also be inclined relative to the top wall 31a. This embodiment and the following embodiments are exemplified by assuming that the diaphragm 322 is parallel to the top wall 31a.

[0104] In the above embodiment, it should be noted that the diaphragm 322 is parallel to the top wall 31a, which means that the plane where the opening around the edge of the basin frame 321 in the core 32 for fixing the diaphragm 322 is located is parallel to the top wall 31a. Correspondingly, the diaphragm 322 is inclined relative to the top wall 31a, which means that the plane where the opening around the edge of the basin frame 321 in the core 32 for fixing the diaphragm 322 is located is inclined relative to the top wall 31a.

[0105] Please continue reading Figure 6 and Figure 8 The diaphragm 322 is opposite to the through hole 34. The inner area of ​​the through hole 34 forms the front cavity Q1 of the speaker module 3.

[0106] A sound outlet channel 33 is provided between the front cavity Q1 and the sound outlet hole H, one end of the sound outlet channel 33 is connected to the front cavity Q1, and the other end extends to and is connected to the sound outlet hole H. The front cavity Q1, the sound outlet channel 33 and the sound outlet hole H are connected to form the front sound cavity of the speaker module 3.

[0107] Please refer to Figure 8 The inner core 32 , the front shell K1 and the rear cover K2 form a rear cavity Q2 of the speaker module 3 , and the rear cavity Q2 is arranged between the inner core 32 and the first side wall 31 b .

[0108] The rear cavity Q2, the space occupied by the basin frame 321 and the driving assembly 323 in the core 32 except the diaphragm 322, and the partial cavity Q3 in the shell 31 located in the core 32 and facing away from the rear cavity Q2 form the rear cavity of the speaker module 3. The rear cavity Q2 is the largest partial cavity in the rear cavity located on the peripheral side of the core 32.

[0109] When the inner core 32 is working, the diaphragm 322 vibrates, which can drive the air in the front cavity Q1 and the sound outlet channel 33 to vibrate, so as to form a sound signal, which is outputted from the sound outlet hole H.

[0110] On the basis of the above, please refer to Figure 8 Since the rear cavity Q2 is disposed between the core 32 and the first side wall 31b, the distance between the core 32 and the sound outlet H is increased by the rear cavity Q2, and the length of the sound outlet channel 33 is extended. Under the premise that the volume of the front sound cavity and the cross-sectional area of ​​the sound outlet channel are constant, the mass M of the speaker module can be increased. M Based on this, the compliance C of the speaker module 3 M Under certain conditions, the resonance frequency F0 can be reduced, which is beneficial to improving the low-frequency performance of the speaker module 3.

[0111] Moreover, since the inner area of ​​the through hole 34 forms the front cavity Q1 of the speaker module 3, the front cavity Q1 is arranged on the top wall 31a, and does not occupy the inner space of the shell 31, which is conducive to increasing the physical space of the rear cavity Q2 in the shell 31 and improving the compliance C of the system. M , ensuring low-frequency performance. At the same time, when the speaker module 3 is applied to Figure 1 and Figure 2 When inside the electronic device 10 shown, the back cover 21 can be used to block the opening of the front cavity Q1 away from the core 32, without the need to separately set a cover structure on the speaker module 3 for blocking the opening. This is beneficial for reducing the thickness of the speaker module 3 and making the electronic device 10 thinner.

[0112] In addition, since the core 32, the front shell K1 and the rear cover K2 form the rear cavity Q2 of the speaker module 3, it is beneficial to increase the physical space of the rear cavity Q2 and improve the compliance C of the system. M, ensuring low-frequency performance. At the same time, the direction from the first side wall 31b to the second side wall 31c is defined as the second direction (that is, the opposite direction of the X-axis direction), and the two ends of the rear cavity Q2 in the second direction are respectively the first end and the second end. Based on this, since at least part of the first side wall 31b forms the side wall of the rear cavity Q2 facing away from the core 32, the sound outlet channel 33 and the rear cavity Q2 are stacked in the height direction of the speaker module 3 (that is, the Z-axis direction), and the two ends of the sound outlet channel 33 are respectively aligned with the first end and the second end of the rear cavity Q2, thereby reducing the size of the speaker module 3 along the second direction, which is conducive to the installation of the speaker module 3 in an electronic device with limited internal space.

[0113] In some other embodiments, the front cavity Q1 may also be disposed between the top wall 31 a and the core 32 .

[0114] In some other embodiments, the side wall of the rear cavity Q2 facing away from the inner core 32 may also be located between the first side wall 31 b and the second side wall 31 c , which is not specifically limited in the present application.

[0115] In the above embodiment, the sound outlet channel 33 may extend along a straight line or a curve, and the number of the sound outlet channels 33 may be one or more, which is not specifically limited in the present application.

[0116] In some embodiments, please refer to Figure 6 The sound outlet channel 33 may include a first sound outlet channel 331. One end of the first sound outlet channel 331 is connected to the front cavity Q1, and the other end extends to the sound outlet hole H and is connected to the sound outlet hole H.

[0117] In this way, the first sound outlet channel 331 extends substantially in a straight line, and this structure is simple and has better air flow smoothness.

[0118] On the basis of the above, optional, please continue to refer to Figure 6 The sound outlet channel 33 may further include a second sound outlet channel 332. One end of the second sound outlet channel 332 is connected to the front cavity Q1, and the other end extends to the sound outlet hole H and is connected to the sound outlet hole H. The second sound outlet channel 332 and the first sound outlet channel 331 are arranged in a first direction. The first direction is perpendicular to the length direction of the first sound outlet channel 331 and parallel to the top wall 31a. The first direction is also the Y-axis direction.

[0119] In this way, the number of sound output channels 33 is larger, the sound output is smoother and more uniform, and the sound effect is better.

[0120] In some embodiments, please refer to Figure 6, the width of the first sound outlet channel 331 in the Y-axis direction is the first width W1, the width of the second sound outlet channel 332 in the Y-axis direction is the second width W2, and the width of the front cavity Q1 in the first direction is the third width W3. On this basis, the sum of the first width W1 and the second width W2 can be greater than or equal to 0.4 times the third width W3.

[0121] In this way, when the inner core 32 is working, the airflow in the front cavity Q1 moves toward the sound outlet channel 33 more smoothly, which can avoid the generation of vortex and improve the sound quality.

[0122] In some embodiments, please refer to Figure 6 , the sum of the first width W1 and the second width W2 may be less than 0.6 times of the third width W3. Specifically, the sum of the first width W1 and the second width W2 may be 0.4 times, 0.5 times or 0.6 times of the third width W3.

[0123] In this way, while ensuring the smoothness of the air flow, the sum of the first width W1 and the second width W2 is small, the sum of the cross-sectional area of ​​the first sound outlet channel 331 and the cross-sectional area of ​​the second sound outlet channel 332 is small, the volume of the sound outlet channel 33 is small, and the volume of the front sound cavity is small, which can increase the mass M of the speaker module 3. M , improving low-frequency performance. In addition, the volume of the front sound cavity is small, so under the premise of a certain appearance size of the speaker module 3, the physical space of the rear cavity Q2 can be increased, which is conducive to improving the compliance C of the system. M , further improving low-frequency performance.

[0124] In some embodiments, please refer to Figure 6 , the first width W1 and the second width W2 may be equal, so as to ensure the uniformity of the acoustic load and reduce the difficulty of design.

[0125] In some other embodiments, the first width W1 and the second width W2 may also be different. Specifically, the first width W1 may be greater than the second width W2, or may be less than the second width W2, which is not specifically limited here.

[0126] In some embodiments, please refer to Figure 6 A first groove C1 and a second groove C2 are formed on the surface of the top wall 31a facing away from the bottom wall 31f.

[0127] One end of the first groove C1 is connected to the through hole 34, and the other end extends to and is connected to the sound hole H. One end of the second groove C2 is connected to the through hole 34, and the other end extends to and is connected to the sound hole H. The first groove C1 and the second groove C2 are arranged at intervals along the Y-axis direction.

[0128] On the basis of the above, the internal space of the first groove C1 forms the first sound outlet channel 331 , and the internal space of the second groove C2 forms the second sound outlet channel 332 .

[0129] In this way, the first sound outlet channel 331 and the second sound outlet channel 332 are arranged on the outer surface of the top wall 31a, and will not occupy the internal space of the shell 31, so that all the space in the shell 31 can be used to form the rear sound cavity, which can increase the volume of the rear sound cavity and help ensure low-frequency performance. Figure 1 and Figure 2 When in the electronic device 10 shown, the openings of the first groove C1 and the second groove C2 can be blocked with the help of the back cover 21, and there is no need to set a cover structure separately in the speaker module 3, which can reduce the thickness of the speaker module 3 and is conducive to the thinning of the electronic device 10.

[0130] In some other embodiments, the first sound outlet channel 331 and the second sound outlet channel 332 may also be disposed inside the housing 31, or inside the material of the top wall 31a, or outside the housing 31. The following embodiments are further described on the basis that the first sound outlet channel 331 is formed by the internal space of the first groove C1, and the second sound outlet channel 332 is formed by the internal space of the second groove C2.

[0131] In some embodiments, the first sound outlet channel 331 and the second sound outlet channel 332 may be respectively connected to the two end spaces of the front cavity Q1 in the Y-axis direction.

[0132] For details, please refer to Fig.11 , Fig.11 for Figure 7 A stereoscopic view of the front shell K1 in the speaker module 3 is shown. The front cavity Q1 includes a first inner surface 341 and a second inner surface 342 which are arranged opposite to each other along the Y-axis direction.

[0133] The inner wall surface of the first sound outlet channel 331 away from the second sound outlet channel 332 is defined as a first inner wall surface 3311 , and the inner wall surface of the second sound outlet channel 332 away from the first sound outlet channel 331 is defined as a second inner wall surface 3321 .

[0134] On the basis of the above, please continue to refer to Fig.11 In the Y-axis direction, the first inner wall surface 3311 and the second inner wall surface 3321 are located between the first inner surface 341 and the second inner surface 342, and the distance from the first inner wall surface 3311 to the first inner surface 341 and the distance from the second inner wall surface 3321 to the second inner surface 342 are both less than or equal to 0.1 times the above-mentioned third width W3.

[0135] Specifically, the distance from the first inner wall surface 3311 to the first inner surface 341 and the distance from the second inner wall surface 3321 to the second inner surface 342 may be 0.1 times, 0.05 times or 0.02 times, etc., of the third width W3, and the present application does not make any specific limitation on this.

[0136] In this way, the first sound outlet channel 331 and the second sound outlet channel 332 are respectively connected to the two end spaces of the front cavity Q1 in the Y-axis direction, which can improve the smoothness of the airflow, reduce vortex, and ensure the sound quality.

[0137] Based on the above embodiment, optionally, please refer to Fig.12 , Fig.12 for Figure 7 Another stereoscopic view of the front shell K1 in the speaker module 3 is shown. In this embodiment, the first inner wall surface 3311 is coplanar with the first inner surface 341 , and the second inner wall surface 3321 is coplanar with the second inner surface 342 .

[0138] In this way, there is no step difference between the first inner wall surface 3311 and the first inner surface 341 , and between the second inner wall surface 3321 and the second inner surface 342 , which can further improve the smoothness of the airflow, reduce eddy currents, and ensure the sound quality.

[0139] In some other embodiments, the first sound outlet channel 331 and the second sound outlet channel 332 may also be connected to the middle space of the front cavity Q1 in the Y-axis direction, which is not specifically limited in the present application.

[0140] The following embodiments are further described on the basis that the distance from the first inner wall surface 3311 to the first inner surface 341, and the distance from the second inner wall surface 3321 to the second inner surface 342 are both less than or equal to 0.1 times the third width W3 mentioned above, which cannot be regarded as a special limitation on the present application.

[0141] For details, please refer to Fig.11 The front cavity Q1 further includes a third inner surface 343. The third inner surface 343 is connected between the first inner surface 341 and the second inner surface 342, and the opening of one end of the first sound outlet channel 331 connected to the front cavity Q1 and the opening of one end of the second sound outlet channel 332 connected to the front cavity Q1 are both located on the third inner surface 343.

[0142] On the basis of the above, please continue to refer to Fig.11 A first notch T1 is provided at a position of the third inner surface 343 corresponding to the first sound outlet channel 331 , and a second notch T2 is provided at a position of the third inner surface 343 corresponding to the second sound outlet channel 332 .

[0143] With the help of the first notch T1 and the second notch T2, the cross-sectional area at the connection position between the front cavity Q1 and the first sound outlet channel 331 and the connection position between the front cavity Q1 and the second sound outlet channel 332 can be increased, which can improve the smoothness of the airflow, reduce eddy currents, and ensure sound quality.

[0144] Since the first sound outlet channel 331 and the second sound outlet channel 332 are disposed on the surface of the top wall 31a facing away from the bottom wall 31f, and the sound outlet hole H is disposed in the middle section of the first side wall 31b in the Z-axis direction, there is a height difference between the first sound outlet channel 331, the second sound outlet channel 332 and the sound outlet hole H in the Z-axis direction. In order to compensate for this height difference, please refer to Fig.11 The bottom surface of the first sound outlet channel 331 includes a first plane area m1 and a first slope area m2. The first plane area m1 is parallel to the bottom wall 31f. The first slope area m2 is connected between the first plane area m1 and the sound outlet hole H, and from the first plane area m1 to the sound outlet hole H, the first slope area m2 is inclined toward the bottom wall 31f (not shown in the figure).

[0145] In this way, by guiding the airflow with the help of the first inclined area m2, the airflow in the first sound outlet channel 331 where the first plane area m1 is located can be introduced into the sound outlet hole H, which can compensate for the height difference between the first sound outlet channel 331 and the sound outlet hole H, and at the same time can improve the smoothness of the airflow, reduce vortices, and ensure sound quality.

[0146] Likewise, please continue to read Fig.11 The bottom surface of the second sound outlet channel 332 may include a second plane area m3 and a second slope area m4. The second plane area m3 is parallel to the bottom wall 31f. The second slope area m4 is connected between the second plane area m3 and the sound outlet hole H, and from the second plane area m3 to the sound outlet hole H, the second slope area m4 is inclined toward the bottom wall 31f (not shown in the figure).

[0147] In this way, by guiding the airflow with the help of the second inclined area m4, the airflow in the second groove C2 where the second plane area m3 is located can be introduced into the sound outlet hole H, which can compensate for the height difference between the second sound outlet channel 332 and the sound outlet hole H, and at the same time can improve the smoothness of the airflow, reduce vortices, and ensure sound quality.

[0148] In some embodiments, please refer to Fig.11 , a partition rib N is provided in the sound outlet hole H. The sound outlet hole H is divided into a first sound outlet portion H1 and a second sound outlet portion H2 by the partition rib N. The first sound outlet portion H1 and the second sound outlet portion H2 are arranged along the Y-axis direction. The first sound outlet channel 331 is connected to the first sound outlet portion H1, and the second sound outlet channel 332 is connected to the second sound outlet portion H2.

[0149] In this way, the airflow from the first sound outlet channel 331 can be separated from the airflow from the second sound outlet channel 332 by means of the partition ribs N, so as to prevent the two airflows from impacting each other in the sound outlet hole H, thereby reducing eddy currents and avoiding noise generation.

[0150] In some embodiments, please refer to Fig.11 , the first sound outlet channel 331 may include a first equal width section C1a and a first flared section C1b. The first equal width section C1a is connected between the front cavity Q1 and the first flared section C1b, and the width of the first equal width section C1a in the Y-axis direction is equal from the front cavity Q1 to the first flared section C1b. The first flared section C1b is connected between the first equal width section C1a and the first sound outlet hole portion H1, and the width of the first flared section C1b in the Y-axis direction gradually increases from the first equal width section C1a to the first sound outlet hole portion H1.

[0151] In this way, with the help of the first expansion section C1b, a smooth transition from the first equal-width section C1a to the first sound outlet portion H1 can be achieved, thereby improving the smoothness of the airflow in the first sound outlet channel 331, reducing vortices, and ensuring sound quality.

[0152] Likewise, please continue to read Fig.11 , the second sound outlet channel 332 may also include a second equal width section C2a and a second flared section C2b. The second equal width section C2a is connected between the front cavity Q1 and the second flared section C2b, and the width of the second equal width section C2a in the Y-axis direction is equal from the front cavity Q1 to the second flared section C2b. The second flared section C2b is connected between the second equal width section C2a and the second sound outlet hole portion H2, and the width of the second flared section C2b in the Y-axis direction gradually increases from the second equal width section C2a to the second sound outlet hole portion H2.

[0153] In this way, with the help of the second expansion section C2b, a smooth transition from the second equal-width section C2a to the second sound outlet portion H2 can be achieved, thereby improving the smoothness of the airflow in the second sound outlet channel 332, reducing eddy currents, and ensuring sound quality.

[0154] Based on any of the above embodiments, in order to further increase the space of the rear cavity Q2, in some embodiments, please refer to Figure 7 The portion of the top wall 31a between the first groove C1 and the second groove C2 is the middle portion 35. Fig.13 , Fig.13 for Figure 7The structure diagram of the speaker module 3 when viewed from the direction F is shown, and a third groove C3 is provided on the surface of the middle part 35 facing the bottom wall 31f. The internal space of the third groove C3 forms a part of the rear cavity Q2, so that the space of the rear cavity Q2 can be expanded, and the volume of the rear cavity Q2 can be guaranteed to be unchanged to a certain extent while extending the length of the sound outlet channel and reducing the cross-sectional area of ​​the sound outlet channel, so as to improve the quality of the vibration system and improve the low-frequency performance.

[0155] In some embodiments, the rear cavity Q2 can be filled with sound-absorbing materials (not shown in the figure), and the sound-absorbing materials include but are not limited to one or more of melamine, zeolite, glass fiber, and activated carbon. The sound-absorbing materials can be in the form of granules or porous blocks. The sound-absorbing materials can increase the equivalent space of the rear cavity Q2, which is beneficial to improving low-frequency performance and sound loudness.

[0156] In some embodiments, see Fig.13 The bottom plate 31f is provided with an opening 36, and the end of the core 32 facing away from the diaphragm 322 is accommodated in the opening 36, and the edge of the end of the core 32 facing away from the diaphragm 322 and the edge of the bottom plate 31f at the opening 36 can be sealed and connected by a sealant. In this way, the wall of the rear cavity Q2 is formed by part of the core 32, which can reduce the thickness of the speaker module 3, which is conducive to the miniaturization of the thickness of the electronic device.

[0157] See also Fig.14 , Fig.14 for Figure 6-Figure 8 The loudspeaker module 3 shown is applied to Figure 1 and Figure 2 The cross-sectional view of the electronic device 10 is shown. The speaker module 3 is arranged between the screen 1 and the back cover 21, and the surface of the back cover K2 in the speaker module 3 facing away from the front shell K1 faces the screen 1, and the surface of the front shell K1 facing away from the back cover K2 faces the back cover 21. With the help of the back cover 21, the opening of the end of the front cavity Q1 away from the core 32, the opening of the first groove and the opening of the second groove C2 can be blocked, which is conducive to reducing the thickness of the speaker module 3 and realizing the thinning of the electronic device. The sound outlet H of the speaker module 3 is opposite to and connected to the sound outlet h, and the sound signal output by the sound outlet H can be transmitted to the user via the sound outlet h.

[0158] because Figure 6-Figure 8 The speaker module 3 shown has better low-frequency performance, so it can improve the loudness of the electronic device when playing low-frequency sound signals.

[0159] See also Fig.15 and Fig.16 , Fig.15 for Figure 3-Figure 5The figure shows the airflow distribution diagram in the front cavity Q1 and the sound outlet channel 33 of the loudspeaker module 3 at the first moment during operation. Fig.16 for Figure 6-Figure 8 The figure shows a schematic diagram of airflow distribution in the front cavity Q1 and the sound outlet channel 33 of the loudspeaker module 3 at the second moment during operation. Figure 3-Figure 5 The speaker module 3 shown is referred to as solution 1 below. Figure 6-Figure 8 The speaker module 3 shown is referred to as Scheme 2 below. The core of the speaker module 3 shown in Scheme 1 is the same as the core of the speaker module 3 shown in Scheme 2, and the core of the speaker module 3 shown in Scheme 1 is at the same vibration position at the first moment as the core of the speaker module 3 shown in Scheme 2 at the second moment. Fig.15 and Fig.16 It can be seen that the maximum velocity of the airflow in the front cavity Q1 and the sound outlet channel 33 of the speaker module 3 shown in Scheme 1 is 55.45 m / s, and the maximum velocity of the airflow in the front cavity Q1 and the sound outlet channel 33 of the speaker module 3 shown in Scheme 2 is 56.30 m / s. Compared with the speaker module 3 shown in Scheme 1, the maximum velocity of the airflow of the speaker module 3 shown in Scheme 2 is approximately equal, but the vortex is reduced and the noise is smaller.

[0160] See also Fig.17 , Fig.17 The sensitivity (SPL) of the speaker module 3 shown in Scheme 1 and the sensitivity of the speaker module 3 shown in Scheme 2 are plotted against frequency. The horizontal axis is the frequency (unit: Hz) and the vertical axis is the sensitivity (unit: dB). The sensitivity of the speaker module 3 shown in Scheme 2 was tested twice. Fig.17 It can be seen that at low frequencies (frequency range: 200-500 Hz), the sensitivity of the speaker module 3 shown in Scheme 2 is improved by an average of 1.8 dB compared to the sensitivity of the speaker module 3 shown in Scheme 1, with a maximum improvement of 2.5 dB.

[0161] See also Fig.18 , Fig.18 The following is a graph showing the change of the electrical impedance (IMP) of the speaker module 3 shown in Scheme 1 and the electrical impedance of the speaker module 3 shown in Scheme 2 with frequency. The horizontal axis is the frequency (unit: Hz) and the vertical axis is the electrical impedance (unit: Ω). The electrical impedance of the speaker module 3 shown in Scheme 2 was tested twice. Fig.18 It can be seen that compared with the resonance frequency F0 of the speaker module 3 shown in the first solution, the resonance frequency F0 of the speaker module 3 shown in the second solution is reduced by more than 100 Hz.

[0162] See also Fig.19 , Fig.19The sensitivity (SPL) of the speaker module 3 shown in the first solution and the sensitivity (SPL) of the speaker module 3 shown in the second solution varies with frequency. The horizontal axis is the frequency (unit: Hz), and the vertical axis is the sensitivity (unit: dB). Fig.19 It can be seen that at low frequencies (frequency range: 200-500 Hz), the sensitivity of the speaker module 3 shown in Scheme 2 is improved by 1.5 dB-2.0 dB compared to the sensitivity of the speaker module 3 shown in Scheme 1.

[0163] After measurement, the volume of the front sound cavity of the speaker module 3 shown in Scheme 2 is 0.1mm larger than that of the front sound cavity of the speaker module 3 shown in Scheme 1. 3 Therefore, the speaker module 3 shown in the second solution can increase the mass M of the vibration system by extending the length of the sound outlet channel and reducing the cross-sectional area of ​​the sound outlet channel while ensuring that the volume of the front sound cavity and the volume of the rear cavity remain roughly unchanged. M , and low frequency performance purposes.

[0164] See also Fig. 20 , Fig. 20 The sensitivity (SPL) of the electronic device including the speaker module 3 shown in the first solution and the electronic device including the speaker module 3 shown in the second solution varies with frequency. The horizontal axis is the frequency (unit: Hz) and the vertical axis is the loudness (unit: dB). Fig. 20 It can be seen that at low frequencies (frequency range: 200-500 Hz), the sensitivity of the electronic device including the speaker module 3 shown in Solution 2 is significantly improved compared to the sensitivity of the electronic device including the speaker module 3 shown in Solution 1, and the loudness is significantly improved.

[0165] See also Fig.21 , Fig.21 Schematic diagram of the cross-sectional structure of the speaker module 3 provided in some embodiments of the present application. Figure 6-Figure 8 The difference of the speaker module 3 shown is that the front cavity Q1 is located between the top wall 31a and the core 32, and the first sound outlet channel and the second sound outlet channel 332 are located inside the front shell K1. This can ensure the airtightness of the speaker module 3 and improve the waterproof and dustproof performance.

[0166] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0167] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A speaker module, characterized in that: include: A shell, the shell comprising a top wall, a bottom wall, a first side wall and a second side wall, the first side wall and the second side wall are respectively connected to two opposite edges of the top wall, the bottom wall is opposite to the top wall and spaced apart, a first groove and a second groove are provided on a surface of the top wall facing away from the bottom wall, and the first side wall is provided with a sound outlet hole; a core, the core being arranged between the first side wall and the second side wall, the core comprising a diaphragm, the diaphragm being parallel to the top wall or inclined relative to the top wall, a front cavity being arranged on one side of the diaphragm, the front cavity being communicated with the sound outlet hole; the speaker module comprising a rear sound cavity, the rear sound cavity comprising a rear cavity, the rear cavity being a portion of the rear sound cavity located between the core and the first side wall, and a width of the rear cavity along a second direction being greater than a width of a portion of the rear sound cavity located between the core and the second side wall along the second direction; the second direction being a direction from the first side wall to the second side wall; A first sound outlet channel is provided between the front cavity and the sound outlet hole, one end of the first sound outlet channel is connected to the front cavity, and the other end of the first sound outlet channel extends toward the sound outlet hole and is connected to the sound outlet hole; A second sound outlet channel is further provided between the front cavity and the sound outlet hole, one end of the second sound outlet channel is connected to the front cavity, and the other end of the second sound outlet channel extends toward the sound outlet hole and is connected to the sound outlet hole; The second sound outlet channel and the first sound outlet channel are arranged at intervals along a first direction; the first direction is perpendicular to the length direction of the first sound outlet channel and parallel to the top wall; The portion of the top wall between the first groove and the second groove is a middle portion, and a third groove is provided on a surface of the middle portion facing the bottom wall. The opening of the third groove faces the bottom wall and is connected to the rear cavity.

2. The speaker module according to claim 1, characterized in that: At least a portion of the first side wall forms a side wall of the rear cavity facing away from the inner core.

3. The speaker module according to claim 1, characterized in that: The sum of the width of the first sound outlet channel in the first direction and the width of the second sound outlet channel in the first direction is greater than or equal to 0.4 times the width of the front cavity in the first direction.

4. The speaker module according to claim 3, characterized in that: The sum of the width of the first sound outlet channel in the first direction and the width of the second sound outlet channel in the first direction is less than or equal to 0.6 times the width of the front cavity in the first direction.

5. The speaker module according to claim 1, characterized in that: The bottom wall is connected between the first side wall and the second side wall; the inner core is located between the top wall and the bottom wall, the top wall is provided with a through hole, the diaphragm is opposite to the through hole, the internal area of ​​the through hole forms the front cavity, and the top wall, the first side wall, the inner core and the bottom wall surround the rear cavity.

6. The speaker module according to claim 5, characterized in that: One end of the first groove is connected to the through hole, and the other end extends toward the sound outlet hole and is connected to the sound outlet hole; One end of the second groove is connected to the through hole, and the other end extends toward the sound outlet hole and is connected to the sound outlet hole; The first groove and the second groove are arranged at intervals along the first direction, the inner space of the first groove forms the first sound outlet channel, and the inner space of the second groove forms the second sound outlet channel.

7. The speaker module according to claim 1, characterized in that: The front cavity includes a first inner surface and a second inner surface opposite to each other along a first direction; The inner wall surface of the first sound outlet channel away from the second sound outlet channel is a first inner wall surface, and the inner wall surface of the second sound outlet channel away from the first sound outlet channel is a second inner wall surface; In the first direction, the first inner wall surface and the second inner wall surface are located between the first inner surface and the second inner surface, and the distance from the first inner surface to the first inner wall surface and the distance from the second inner surface to the second inner wall surface are both less than or equal to 0.1 times the width of the front cavity in the first direction.

8. The speaker module according to claim 1, characterized in that: The front cavity includes a first inner surface and a second inner surface opposite to each other along a first direction; The inner wall surface of the first sound outlet channel away from the second sound outlet channel is a first inner wall surface, and the inner wall surface of the second sound outlet channel away from the first sound outlet channel is a second inner wall surface; The first inner surface is coplanar with the first inner wall surface, and the second inner surface is coplanar with the second inner wall surface.

9. The speaker module according to claim 7, characterized in that: The front cavity further includes a third inner surface, the third inner surface is connected between the first inner surface and the second inner surface, and an opening at one end of the first sound outlet channel communicating with the front cavity and an opening at one end of the second sound outlet channel communicating with the front cavity are both located on the third inner surface; A first notch is provided on the third inner surface at a position corresponding to the first sound outlet channel, and a second notch is provided on the third inner surface at a position corresponding to the second sound outlet channel.

10. The speaker module according to claim 5, characterized in that: The bottom surface of the first sound outlet channel includes a first plane area and a first inclined area; The first planar area is parallel to the bottom wall; The first inclined surface area is connected between the first plane area and the sound outlet hole, and from the first plane area to the sound outlet hole, the first inclined surface area is inclined toward the bottom wall.

11. The speaker module according to any one of claims 1 to 10, characterized in that: A partition rib is provided in the sound outlet hole, and the sound outlet hole is divided into a first sound outlet hole part and a second sound outlet hole part by the partition rib, and the first sound outlet hole part and the second sound outlet hole part are arranged along the first direction; The first sound outlet channel is partially communicated with the first sound outlet hole, and the second sound outlet channel is partially communicated with the second sound outlet hole.

12. The speaker module according to claim 11, characterized in that: The first sound outlet channel includes a first equal-width section and a first flared section, the first flared section is connected between the first equal-width section and the first sound outlet hole portion, and the width of the first flared section in the first direction gradually increases from the first equal-width section to the first sound outlet hole portion.

13. An electronic device, characterized in that: Comprising a screen, a back shell and a speaker module according to any one of claims 1 to 12; The screen is connected to the back shell, the speaker module is arranged between the screen and the back shell, and the back shell is provided with a sound outlet hole, and the sound outlet hole of the speaker module is opposite to the sound outlet hole.

14. The electronic device according to claim 13, characterized in that: The electronic device is a tablet computer.

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