Speaker modules and electronic devices

Abstract

The present invention discloses a speaker module and an electronic device, wherein the speaker module includes a shell and a speaker unit, the shell having a receiving cavity, a clearance opening and a sound outlet channel, the clearance opening and the sound outlet channel are both connected to the receiving cavity. The speaker unit is arranged in the receiving cavity, the end of the speaker unit away from its diaphragm extends into the clearance opening, the speaker unit separates the receiving cavity into a front sound cavity and a first rear sound cavity, the sound outlet channel is connected to the front sound cavity, the diaphragm has a first area close to the sound outlet channel, and a second area away from the sound outlet channel, the shell also has a second rear sound cavity connected to the first rear sound cavity, the second rear sound cavity and the front sound cavity are located on the same side of the diaphragm, and the orthographic projection of the second rear sound cavity on the diaphragm is located in the second area. The technical solution of the present invention can increase the aperture of the sound outlet hole on the wall of the front sound cavity and reduce the airflow sound.

Description

Technical Field

[0001] The present invention relates to the technical field of sound energy conversion, and in particular to a speaker module and electronic equipment. Background Art

[0002] Generally, a micro speaker module usually includes a shell, in which a speaker unit is housed, and the speaker unit divides the module into two cavities, a front sound cavity and a rear sound cavity. At present, in order to increase the space of the rear sound cavity, a partition plate parallel to the diaphragm is provided in the front sound cavity to separate the part of the front sound cavity away from the diaphragm to form an independent cavity, and connect the cavity with the rear sound cavity, so as to achieve the purpose of increasing the rear sound cavity. However, in this scheme, the space of the front sound cavity is greatly reduced, the aperture of the sound outlet on the wall of the front sound cavity is reduced, the airflow sound is large when the diaphragm vibrates, and the acoustic performance of the speaker module is poor. Summary of the invention

[0003] The main purpose of the present invention is to provide a speaker module, which aims to increase the aperture of the sound outlet on the wall of the front sound cavity and reduce the air flow sound.

[0004] To achieve the above object, the speaker module proposed in the present invention comprises:

[0005] The housing has a receiving cavity, a clearance opening and a sound outlet channel, wherein the clearance opening and the sound outlet channel are both connected to the receiving cavity; and

[0006] A speaker unit is arranged in the receiving cavity, one end of the speaker unit away from the diaphragm thereof extends into the clearance opening, the speaker unit separates the receiving cavity into a front sound cavity and a first rear sound cavity, the sound outlet channel is connected to the front sound cavity, and the diaphragm has a first area close to the sound outlet channel and a second area away from the sound outlet channel;

[0007] The shell further comprises a second rear acoustic cavity connected to the first rear acoustic cavity, the second rear acoustic cavity and the front acoustic cavity are located on the same side of the diaphragm, and the orthographic projection of the second rear acoustic cavity on the diaphragm is located in the second area.

[0008] Optionally, the shell includes a shell body, a first partition plate and a second partition plate, the first partition plate and the second partition plate are installed at positions of the shell body corresponding to the second area, and the first partition plate is located between the second partition plate and the speaker unit, and the second rear sound cavity is formed between the first partition plate, the second partition plate and the shell body.

[0009] Optionally, the second partition is a metal piece and is bonded to the shell body.

[0010] Optionally, an installation groove is provided on the outer surface of the shell body, and the second partition includes a central plate body and a mounting plate body arranged around the central plate body, the mounting plate body is installed at the bottom of the mounting groove, and the thickness of the mounting plate body is less than the depth of the mounting groove.

[0011] Optionally, the central plate body protrudes relative to the mounting plate body in a direction away from the first partition; and / or the first partition includes a plate body and a connecting portion surrounding the plate body, the connecting portion is connected to the shell body, and the plate body protrudes relative to the connecting portion in a direction away from the second partition.

[0012] Optionally, a glue containing groove is provided at the bottom of the mounting groove.

[0013] Optionally, the first partition is a metal piece and is integrally injection molded with the shell body.

[0014] Optionally, a sealant is provided at the connection between the first partition and the shell body.

[0015] Optionally, the cavity wall of the front acoustic cavity has an abutment boss, the abutment boss is arranged around the diaphragm and abuts against a fixing portion of the diaphragm, and the abutment boss is provided with an avoidance notch corresponding to the sound outlet channel.

[0016] Optionally, the diaphragm includes a central portion, a folded ring portion arranged around the central portion, and a fixed portion arranged around the folded ring portion, the folded ring portion protrudes toward the front sound cavity, the front sound cavity has a cavity wall facing the diaphragm, and the cavity wall is provided with an avoidance groove corresponding to the folded ring portion.

[0017] The present invention also proposes an electronic device, including a speaker module, the speaker module including a shell and a speaker unit, the shell having a receiving cavity, a clearance opening and a sound outlet channel, the clearance opening and the sound outlet channel are both connected to the receiving cavity. The speaker unit is arranged in the receiving cavity, the end of the speaker unit away from its diaphragm extends into the clearance opening, the speaker unit separates the receiving cavity into a front sound cavity and a first rear sound cavity, the sound outlet channel is connected to the front sound cavity, the diaphragm has a first area close to the sound outlet channel, and a second area away from the sound outlet channel, the shell also has a second rear sound cavity connected to the first rear sound cavity, the second rear sound cavity and the front sound cavity are located on the same side of the diaphragm, and the orthographic projection of the second rear sound cavity on the diaphragm is located in the second area.

[0018] The technical solution of the present invention is to provide a clearance opening on the shell, so that when the speaker unit is installed in the receiving cavity, it can extend into the clearance opening, which is equivalent to moving the speaker unit toward one side of the first rear sound cavity. When the thickness of the shell remains unchanged, the space of the front sound cavity can be increased. By providing a second rear sound cavity connected to the first rear sound cavity on the shell, the volume of the first rear sound cavity can be increased. At the same time, when the positive projection of the second rear sound cavity on the diaphragm is located in the second area away from the sound outlet channel, the position of the second rear sound cavity on the shell can be set away from the sound outlet channel to ensure that the front sound cavity part between the first area close to the sound outlet channel and the shell still maintains a large space, so that a sound outlet channel with a larger aperture can be set to reduce the sound of the outlet flow. In addition, when the volume of the first rear sound cavity is increased by providing the second rear sound cavity, the low-frequency performance of the speaker module can be improved, and the space utilization rate on the speaker module can also be improved, so that the structure of the speaker module is more compact. In addition, when the end of the speaker unit away from its diaphragm is extended into the clearance opening, the heat of the speaker unit can be dissipated from the clearance opening, which can improve the heat dissipation effect of the speaker module. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0020] Figure 1 It is an exploded schematic diagram of an embodiment of a speaker module of the present invention;

[0021] Figure 2 for Figure 1 A schematic cross-sectional view of the middle speaker module in an assembled state;

[0022] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0023] Figure 4 for Figure 1 Schematic diagram of the structure of the middle and upper shell viewed from the bottom.

[0024] Description of Figure Numbers:

[0025]

[0026]

[0027] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0030] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions, taking "A and / or B as an example", including solution A, or solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] The present invention provides a speaker module, which can be used in electronic devices capable of making sound, such as earphones and mobile phones.

[0032] In the embodiments of the present invention, please refer to Figures 1 to 3The speaker module includes a housing 10 and a speaker unit 20. The housing 10 has a receiving cavity 14, a clearance opening 1121 and a sound outlet channel 17. The clearance opening 1121 and the sound outlet channel 17 are both connected to the receiving cavity 14. The speaker unit 20 is arranged in the receiving cavity 14. One end of the speaker unit 20 away from its diaphragm 21 extends into the clearance opening 1121. The speaker unit 20 separates the receiving cavity 14 into a front sound cavity 141 and a first rear sound cavity 142. The sound outlet channel 17 is connected to the front sound cavity 141. The diaphragm 21 has a first area 211 close to the sound outlet channel 17 and a second area 212 away from the sound outlet channel 17. The housing 10 also has a second rear sound cavity 16 connected to the first rear sound cavity 142. The second rear sound cavity 16 and the front sound cavity 141 are located on the same side of the diaphragm 21. The orthographic projection of the second rear sound cavity 16 on the diaphragm 21 is located in the second area 212.

[0033] In this embodiment, the speaker unit 20 includes a vibration system and a magnetic circuit system (not shown in the figure), the vibration system includes a diaphragm 21 and a voice coil (not shown in the figure) fixed to one side of the diaphragm 21, the diaphragm 21 is connected to the front sound cavity 141, the diaphragm 21 includes a central part, a folding ring part arranged around the central part, and a fixed part arranged around the folding ring part, and the diaphragm 21 may also include a composite layer combined with the central part. The magnetic circuit system includes a magnetic yoke, and the magnetic yoke is provided with an inner magnetic circuit part and an outer magnetic circuit part, and a magnetic gap for accommodating the voice coil is formed between the two. In one case, the inner magnetic circuit part includes a central magnet arranged at the central position of the magnetic yoke and a central magnetic plate arranged on the central magnet, and the outer magnetic circuit part includes a side magnet arranged at the edge position of the magnetic yoke and a side magnetic plate arranged on the side magnet. The speaker unit 20 may also include an auxiliary system, the auxiliary system includes a single housing, and the single housing is used to accommodate and fix the vibration system and the magnetic circuit system. In addition, the auxiliary system may also include a front cover, which is combined with the upper part of the single housing, and the front cover and the single housing enclose a protective frame of the speaker unit 20. Of course, in some cases, the speaker unit 20 may not include the auxiliary system.

[0034] It can be understood that the depth of the clearance opening 1121 is the wall thickness of the housing 10, and the depth of the clearance opening 1121 is relatively small. Therefore, in this embodiment, only part of the magnetic circuit system of the speaker unit 20 extends into the clearance opening 1121, for example, the magnetic yoke is completely or partially located in the clearance opening 1121, so that the magnetic yoke is exposed outside the receiving cavity 14 from the clearance opening 1121. Of course, in other embodiments, the wall thickness of the housing 10 where the clearance opening 1121 is provided can also be set thicker to extend the speaker unit 20 as a whole into the clearance opening 1121. In addition, the surface of the magnetic yoke facing away from the diaphragm 21 can be roughly flush with the outer surface of the housing 10, and the surface of the magnetic yoke facing away from the diaphragm 21 can also be lower than the outer surface of the housing 10. By extending the speaker unit 20 into the clearance opening 1121, it is equivalent to moving the speaker unit 20 toward one side of the rear sound cavity. When the thickness of the shell 10 remains unchanged, the space of the front sound cavity 141 can be increased, and then the aperture of the sound hole on the wall of the front sound cavity 141 can be increased.

[0035] The front acoustic cavity 141 has a cavity wall facing the diaphragm 21, and the second rear acoustic cavity 16 is arranged at the cavity wall portion of the shell 10 facing the diaphragm 21. Under the condition of ensuring that the overall thickness of the shell 10 remains unchanged, the cavity wall portion of the front acoustic cavity 141 can be thickened so that the shell 10 has sufficient thickness to set the second rear acoustic cavity 16. Since the second rear acoustic cavity 16 is arranged corresponding to the second area 212, and the second area 212 is far away from the sound outlet channel 17, it is only necessary to thicken the portion of the cavity wall of the front acoustic cavity 141 corresponding to the second area 212. The portion of the cavity wall of the front acoustic cavity 141 corresponding to the first area 211 is not provided with the second rear acoustic cavity 16, and does not need to be thickened, so the vertical distance between the first area 211 and the cavity wall of the front acoustic cavity 141 can be made greater than the vertical distance between the second area 212 and the rear acoustic cavity, thereby making the space of the front acoustic cavity 141 where the sound outlet channel 17 is arranged larger, and a sound outlet channel 17 with a larger aperture can be set to reduce airflow sound. In this embodiment, the front sound cavity 141 also has a side wall connected to the cavity wall, and the sound outlet channel 17 is arranged on the side wall. Of course, in other embodiments, the sound outlet channel 17 can also be arranged on the cavity wall.

[0036] The technical solution of the present invention provides a clearance opening 1121 on the housing 10, so that when the speaker unit 20 is installed in the receiving cavity 14, it can extend into the clearance opening 1121, which is equivalent to moving the speaker unit 20 toward one side of the first rear sound cavity 142. When the thickness of the housing 10 remains unchanged, the space of the front sound cavity 141 can be increased. By providing a second rear sound cavity 16 connected to the first rear sound cavity 142 on the housing 10, the volume of the first rear sound cavity 142 can be increased. At the same time, by locating the orthographic projection of the second rear sound cavity 16 on the diaphragm 21 in the second area 212 away from the sound outlet channel 17, the position of the second rear sound cavity 16 on the housing 10 can be set away from the sound outlet channel 17, so as to ensure that the front sound cavity 141 part between the first area 211 close to the sound outlet channel 17 and the housing 10 still maintains a large space, so that a sound outlet channel 17 with a larger aperture can be provided to reduce the sound of the outlet air flow. In addition, by providing the second rear acoustic cavity 16 to increase the volume of the first rear acoustic cavity 142, the low-frequency performance of the speaker module can be improved, and the space utilization rate on the speaker module can be improved, making the structure of the speaker module more compact. In addition, when the end of the speaker unit 20 away from its diaphragm 21 is extended into the clearance opening 1121, the heat of the speaker unit 20 can be dissipated from the clearance opening 1121, which can improve the heat dissipation effect of the speaker module.

[0037] In one embodiment, the housing 10 includes a housing body 11, a first baffle 12, and a second baffle 13. The first baffle 12 and the second baffle 13 are installed at positions of the housing body 11 corresponding to the second area 212, and the first baffle 12 is located between the second baffle 13 and the speaker unit 20. The first baffle 12, the second baffle 13, and the housing body 11 are surrounded to form a second rear sound cavity 16. Specifically, the housing body 11 includes an upper housing 111 and a lower housing 112. The upper housing 111 and the lower housing 112 jointly form a receiving cavity 14. A front sound cavity 141 is formed between the upper housing 111 and the speaker unit 20. The upper housing 111, the lower housing 112, and the speaker unit 20 jointly form a first rear sound cavity 142. A clearance opening 1121 is provided in the lower housing 112, and a portion of the upper housing 111 corresponding to the second area 212 is open. The first baffle 12 and the second baffle 13 are respectively covered at the open position, and the surface of the first baffle 12 facing away from the second baffle 13 constitutes the cavity wall of the front sound cavity 141, and the surface of the second baffle 13 facing away from the first baffle 12 is exposed outside the receiving cavity 14. The first baffle 12 and the second baffle 13 are spaced apart, so that the first baffle 12, the second baffle 13 and the upper shell are enclosed together to form a second rear sound cavity 16. Of course, in other embodiments, the shell body 11 can also be an integral structure formed in one piece.

[0038] In one embodiment, the first baffle 12 is a metal part, so that the strength of the first baffle 12 is relatively high, and the thickness of the first baffle 12 can be relatively small, so that the volume of the second rear acoustic cavity 16 or the front acoustic cavity 141 can be increased, and the overall strength of the shell 10 can also be improved. In addition, the thermal conductivity of metal is good. When the first baffle 12 is set in this way, the heat dissipation effect of the front acoustic cavity 141 can also be improved. In one embodiment, the second baffle 13 is a metal part. Similarly, this can also ensure that the strength of the second baffle 13 is relatively high, and the thickness of the second baffle 13 can be relatively small, so that the volume of the second rear acoustic cavity 16 can be increased, and the overall strength of the shell 10 can also be improved. In addition, the thermal conductivity of metal is relatively good. When the second baffle 13 is set in this way, the heat dissipation effect of the speaker module can also be improved. Among them, the material of the first baffle 12 and the second baffle 13 can be stainless steel, copper, copper alloy, aluminum alloy, etc.

[0039] There are many ways to install the first partition 12. For example, in one embodiment, the first partition 12 is integrally injection molded with the upper shell 111. That is, the first partition 12 is integrally injection molded with the shell 10 as an insert, so that the first partition 12 can be securely installed on the shell 10, the overall stability of the speaker module is high, the structural strength of the shell 10 can be improved, and the subsequent assembly process of the first partition 12 and the shell 10 is eliminated, which simplifies the installation process of the speaker module and helps to improve production efficiency. Of course, in other embodiments, the first partition 12 can also be bonded to the hole wall of the shell body 11, etc.

[0040] In addition, when the first partition 12 and the upper shell 111 are integrally injection molded, the first partition 12 and the upper shell 111 may have a poor bonding effect, which may cause the second rear sound cavity 16 to be connected to the front sound cavity 141. To reduce this possibility, in one embodiment, a sealant is provided at the connection between the first partition 12 and the upper shell 111 to improve the sealing between the first partition 12 and the upper shell 111, which can also achieve a better waterproof effect.

[0041] There are also many ways to install the second partition 13. For example, in one embodiment, the second partition 13 is bonded to the upper shell 111. That is, the second partition 13 is bonded to the shell body 11 by glue, which has low requirements on the installation structure of the shell body 11, can simplify the structure of the shell body 11, and while fixing the second partition 13, the connection between the second partition 13 and the shell body 11 can be sealed by glue, which is equivalent to performing the installation process of the second partition 13 and the sealing process of the second partition 13 at the same time, which can reduce the installation process of the speaker module. Of course, in other embodiments, the second partition 13 can also be clamped with the shell body 11, or the second partition 13 can be installed on the shell body 11 by screws, etc.

[0042] In one embodiment, the outer surface of the shell body 11 is provided with a mounting groove 1111, and the second partition plate 13 includes a central plate body 131 and a mounting plate body 132 arranged around the central plate body 131, and the mounting plate body 132 is installed at the bottom of the mounting groove 1111, and the thickness of the mounting plate body 132 is less than the groove depth of the mounting groove 1111. Specifically, when the second partition plate 13 is installed in the mounting groove 1111, glue can be applied to the groove bottom of the mounting groove 1111, and the mounting plate body 132 can be installed at the groove bottom of the mounting groove 1111. Since the thickness of the mounting plate body 132 is less than the groove depth of the mounting groove 1111, when the mounting plate body 132 is installed at the groove bottom of the mounting groove 1111, the outer surface of the mounting plate body 132 that is away from the groove bottom of the mounting groove 1111 will still be lower than the outer surface of the shell body 11. In this way, when the glue overflows to the outer surface of the mounting plate 132, the glue can be prevented from protruding from the outer surface of the shell body 11, and more glue can be applied on the outer surface of the mounting plate 132, so that the glue can adhere to more groove walls of the mounting groove 1111 and the outer surface of the mounting plate 132, that is, the bonding area of ​​the mounting plate 132 can be increased, thereby improving the bonding stability of the second partition 13.

[0043] In addition, in order to further improve the bonding stability of the mounting plate body 132, in one embodiment, a glue-containing groove 1112 is provided at the bottom of the mounting groove 1111. The glue-containing groove 1112 extends in an annular shape along the circumference of the mounting groove 1111, which is equivalent to increasing the surface area of ​​the bottom of the mounting groove 1111. When glue is applied to the bottom of the mounting groove 1111, the glue-containing groove 1112 can accommodate glue, so that more glue can be provided between the mounting body and the bottom of the mounting groove 1111, so that the mounting plate body 132 and the bottom of the mounting groove 1111 are more firmly bonded. Among them, when the glue-containing groove 1112 is annular, the number of the glue-containing grooves 1112 can be one, two, three, and so on. Of course, in other embodiments, the number of the glue-containing grooves 1112 can also be multiple, and the multiple glue-containing grooves 1112 are arranged at intervals along the circumference of the mounting groove 1111.

[0044] In one embodiment, the center plate body 131 protrudes in a direction away from the first partition plate 12 relative to the mounting plate body 132. Specifically, the vertical distance between the center plate body 131 and the first partition plate 12 is greater than the vertical distance between the mounting plate body 132 and the first partition plate 12. The mounting plate body 132 and the center plate body 131 are integrally formed, and the inner surface of the center plate body 131 is recessed in a direction away from the first partition plate 12, and the outer surface is correspondingly raised to protrude from the outer surface of the mounting plate body 132. This is equivalent to increasing the distance between the center plate body 131 and the first partition plate 12, which can increase the volume of the second rear sound cavity 16, and is beneficial to improving the low-frequency performance of the speaker module. Of course, in other embodiments, the center plate body 131 can also be bonded to the outer surface of the mounting plate body 132.

[0045] In addition, in one embodiment, the first baffle 12 includes a plate body 121 and a surrounding connecting portion 122, the connecting portion 122 is connected to the shell body 11, and the plate body 121 protrudes in a direction away from the second baffle 13 relative to the connecting portion 122. Specifically, the plate body 121 and the connecting portion 122 are integrally formed, the surface of the plate body 121 facing the second baffle 13 is recessed in the connecting portion 122, and the surface of the plate body 121 facing the diaphragm 21 protrudes from the connecting portion 122. In this way, the distance between the plate body 121 and the central plate body 131 is increased, and the volume of the second rear sound cavity 16 is further increased, which is conducive to improving the low-frequency performance of the speaker module.

[0046] In one embodiment, the folding ring portion is arranged to protrude toward the front acoustic cavity 141, and the front acoustic cavity 141 has a cavity wall facing the diaphragm 21, and the cavity wall is provided with an avoidance groove 1113 corresponding to the folding ring portion. When the folding ring portion is arranged to protrude toward the front acoustic cavity 141, it is equivalent to using the space of the front acoustic cavity 141 for the folding ring portion to vibrate, which can improve the space utilization rate of the speaker module. By providing the avoidance groove 1113, a larger vibration space can be provided for the folding ring portion to prevent the folding ring portion from touching the cavity wall of the front acoustic cavity 141 and affecting the vibration of the diaphragm 21. In addition, when the avoidance groove 1113 is provided in the cavity wall corresponding to the first area 211, the sound outlet channel 17 can also pass through the groove side wall of the avoidance groove 1113, so as to further increase the aperture of the sound outlet channel 17 and reduce the airflow sound.

[0047] Please refer to Figure 2 and Figure 4 In one embodiment, the cavity wall of the front sound cavity 141 has an abutting boss 15, which is arranged around the diaphragm 21 and abuts against the fixed part of the diaphragm 21. The abutting boss 15 is provided with an avoidance notch 151 corresponding to the sound outlet channel 17. Specifically, the abutting boss 15 is arranged in a ring shape and abuts against the fixed part, and the abutting boss 15 is bonded to the fixed part by sealing glue, so that the speaker unit 20 can be fixed well and a good waterproof effect can be achieved. When the avoidance notch 151 is provided at the position corresponding to the sound outlet channel 17, it is equivalent to that the fixed part at the position corresponding to the sound outlet channel 17 does not need to be provided with the abutting boss 15 for abutment, and the lower hole wall of the sound outlet channel 17 can be set flush or lower than the upper surface of the fixed part, thereby increasing the aperture height of the sound outlet channel 17, increasing the aperture of the sound outlet channel, and reducing the airflow sound.

[0048] In one embodiment, to improve the waterproof effect, the outer peripheral surface of the speaker unit 20 close to the diaphragm 21 is sealed and bonded to the housing 10 by glue, and the portion of the speaker unit 20 extending into the clearance opening 1121 is also sealed and bonded to the housing 10.

[0049] The present invention also proposes an electronic device, which includes a device body and a speaker module. The specific structure of the speaker module refers to the above embodiment. Since the electronic device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. Among them, the speaker module is arranged on the device body, and the device body can make sound through the speaker module. The electronic device can be a mobile phone, a computer, a tablet computer or a smart speaker, etc.

[0050] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A speaker module, characterized in that: include: The housing has a receiving cavity, a clearance opening and a sound outlet channel, wherein the clearance opening and the sound outlet channel are both connected to the receiving cavity; as well as, A speaker unit is arranged in the receiving cavity, one end of the speaker unit away from the diaphragm thereof extends into the clearance opening, the speaker unit separates the receiving cavity into a front sound cavity and a first rear sound cavity, the sound outlet channel is connected to the front sound cavity, and the diaphragm has a first area close to the sound outlet channel and a second area away from the sound outlet channel; The shell further comprises a second rear acoustic cavity connected to the first rear acoustic cavity, the second rear acoustic cavity and the front acoustic cavity are located on the same side of the diaphragm, and the orthographic projection of the second rear acoustic cavity on the diaphragm is located in the second area.

2. The speaker module according to claim 1, wherein: The shell body includes a shell body, a first partition plate and a second partition plate, the first partition plate and the second partition plate are installed at positions of the shell body corresponding to the second area, and the first partition plate is located between the second partition plate and the speaker unit, and the first partition plate, the second partition plate and the shell body are surrounded to form the second rear sound cavity.

3. The speaker module according to claim 2, characterized in that: The second partition is a metal piece and is bonded to the shell body.

4. The speaker module according to claim 3, characterized in that: The outer surface of the shell body is provided with a mounting groove, and the second partition includes a central plate body and a mounting plate body arranged around the central plate body, the mounting plate body is installed at the bottom of the mounting groove, and the thickness of the mounting plate body is less than the depth of the mounting groove.

5. The speaker module according to claim 4, characterized in that: The central plate body protrudes relative to the mounting plate body in a direction away from the first partition plate; and / or, The first partition includes a plate body and a connecting portion surrounding the plate body, the connecting portion is connected to the shell body, and the plate body protrudes relative to the connecting portion in a direction away from the second partition.

6. The speaker module according to claim 4, characterized in that: A glue containing groove is provided at the bottom of the installation groove.

7. The speaker module according to claim 2, wherein: The first partition is a metal piece and is integrally injection-molded with the shell body.

8. The speaker module according to claim 7, wherein: A sealant is provided at the connection between the first partition and the shell body.

9. The speaker module according to claim 2, wherein: The cavity wall of the front sound cavity has an abutment boss, which is arranged around the diaphragm and abuts against the fixing part of the diaphragm. The abutment boss is provided with an avoidance notch corresponding to the sound outlet channel.

10. The loudspeaker module according to any one of claims 1 to 9, characterized in that: The diaphragm includes a central portion, a folded ring portion arranged around the central portion, and a fixed portion arranged around the folded ring portion, the folded ring portion is arranged to protrude toward the front sound cavity, the front sound cavity has a cavity wall facing the diaphragm, and the cavity wall is provided with an avoidance groove corresponding to the folded ring portion.

11. An electronic device, characterized in that: Comprising a speaker module as described in any one of claims 1 to 10.

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