Sound production module

Abstract

The invention discloses a sound production module, the sound production module comprises a sound production device and a module shell, the sound production device comprises a shell, a magnetic circuit system and a vibration system, and the shell is provided with a first sound outlet hole; the vibration system comprises a first vibrating diaphragm, a second vibrating diaphragm, a middle diaphragm and a voice coil, the first vibrating diaphragm is arranged on one side, far away from the magnetic circuit system, of the shell, the second vibrating diaphragm is arranged on one side, facing the magnetic circuit system, of the first vibrating diaphragm, and the middle diaphragm is arranged between the first vibrating diaphragm and the second vibrating diaphragm; a closed second sound production cavity is formed between the second vibrating diaphragm and the middle diaphragm, and the second sound production cavity is communicated with the first sound outlet hole; a first sound production cavity is formed between the module shell and the first vibrating diaphragm, the module shell is provided with a sound outlet, and the sound outlet is communicated with the first sound production cavity; the sound production module is applied to the electronic equipment, the sound production module is provided with a rear sound production channel, the electronic equipment is provided with an electronic equipment cavity and an electronic equipment sound production hole, and the electronic equipment sound production hole is communicated with a sound production port; and the rear sound outlet channel is communicated with the electronic equipment cavity.

Description

Technical Field

[0001] The present application relates to the technical field of electronic products, and more specifically, to a sound module. Background Art

[0002] With the rapid development of the consumer electronics industry, consumers' requirements for electronic products are constantly increasing; in addition to the performance of the product itself, its portability and comfort have become the key aspects that consumers pay attention to. At present, conventional speakers are difficult to meet multiple design requirements such as high performance and thinness at the same time.

[0003] In view of this, it is necessary to provide a new technical solution to solve the above technical problems. Summary of the invention

[0004] One purpose of the present application is to provide a new technical solution for a sound module.

[0005] According to a first aspect of the present application, a sound module is provided, the sound module comprising:

[0006] A sound-generating device, the sound-generating device comprising a housing, a magnetic circuit system and a vibration system, the housing having a housing space, the housing having a first sound outlet; the magnetic circuit system being arranged in the housing space, the magnetic circuit system having a magnetic gap;

[0007] The vibration system comprises a first diaphragm, a second diaphragm, a middle diaphragm and a voice coil, wherein the first diaphragm is arranged on a side of the housing away from the magnetic circuit system, the second diaphragm is arranged on a side of the first diaphragm facing the magnetic circuit system, and the middle diaphragm is arranged between the first diaphragm and the second diaphragm; the voice coil is at least partially arranged in the magnetic gap, and the voice coil is connected to the first diaphragm, and the second diaphragm and the middle diaphragm are located outside the voice coil;

[0008] The outer edges of the second diaphragm and the middle diaphragm are connected to the housing, and the inner edges of the second diaphragm and the middle diaphragm are connected to the first diaphragm; a closed second sound cavity is formed between the second diaphragm and the middle diaphragm, and the second sound cavity is connected to the first sound outlet hole;

[0009] A module housing, wherein the sound-generating device is disposed in the module housing, a first sound-generating cavity is formed between the module housing and the first diaphragm, and the module housing has a sound outlet, and the sound outlet is communicated with the first sound-generating cavity;

[0010] The sound module is applied to an electronic device, the sound module has a rear sound outlet channel, the electronic device has an electronic device cavity and an electronic device sound outlet hole, the electronic device sound outlet hole is connected to the sound outlet, and the rear sound outlet channel is connected to the electronic device cavity.

[0011] Optionally, the sound module has an air flow channel connecting the first sound hole and the sound outlet, and the second sound cavity is connected to the sound outlet via the first sound hole and the air flow channel.

[0012] Optionally, the first sound outlet hole and the sound outlet are directly opposite to and connected with each other.

[0013] Optionally, a first rear cavity is formed between the first diaphragm and the middle diaphragm, and a second rear cavity is formed between the first diaphragm, the second diaphragm and the housing; the first rear cavity is connected to the second rear cavity.

[0014] Optionally, the first diaphragm includes a first folding ring and a first vibration plate, the outer edge of the first folding ring is connected to the housing, the inner edge of the first folding ring is connected to the first vibration plate, the first vibration plate is provided with a first protrusion, the first protrusion is connected to the second diaphragm and the middle diaphragm; the first protrusion is provided with a notch for connecting the first rear cavity and the second rear cavity;

[0015] Alternatively, the first diaphragm includes a first fold ring, a first vibration plate and a first bracket, the outer edge of the first fold ring is connected to the outer shell, the inner edge of the first fold ring is connected to the first vibration plate, one end of the first bracket is connected to the first vibration plate, and the other end of the first bracket is connected to the second diaphragm and the middle diaphragm; the first bracket is provided with a notch for connecting the first rear cavity and the second rear cavity.

[0016] Optionally, the second diaphragm includes a second fold ring and a second vibration plate, the outer side of the second fold ring is connected to the outer shell, the inner side of the second fold ring is connected to the outer side of the second vibration plate, and the inner side of the second vibration plate is integrally bent and extends to the first diaphragm and is connected to the first diaphragm.

[0017] Optionally, the inner side of the second vibration plate includes an inclined portion arranged at a predetermined angle to the vibration direction.

[0018] Optionally, the middle diaphragm is a flexible member, and the middle diaphragm comprises an external connection portion, a deformation portion, and an internal connection portion, wherein the external connection portion is fixed to the housing, and the deformation portion is located between the external connection portion and the internal connection portion; and the internal connection portion is located between the first diaphragm and the inner edge of the second vibration plate;

[0019] And / or, the middle diaphragm is a flexible member, the effective vibration area of ​​the middle diaphragm is smaller than the effective vibration area of ​​the second diaphragm, and the ratio of the effective vibration area of ​​the middle diaphragm to the effective vibration area of ​​the second diaphragm is 1:1.5 to 1:3;

[0020] And / or, the middle diaphragm is a flexible member, and the compliance of the second folding ring is smaller than the compliance of the middle diaphragm.

[0021] Optionally, the first diaphragm includes a first fold ring, the middle diaphragm includes a deformation portion, the first fold ring protrudes in a direction away from the second diaphragm, and the deformation portion protrudes in a direction close to the second diaphragm;

[0022] And / or, the middle diaphragm includes a deformation portion, the second fold ring protrudes in a direction close to the first diaphragm, the deformation portion protrudes in a direction away from the first diaphragm, and the second fold ring and the deformation portion are staggered in a horizontal direction.

[0023] Optionally, the magnetic circuit system includes a magnetic yoke and an inner magnetic part and an edge magnetic part arranged on the magnetic yoke, the magnetic gap is formed between the inner magnetic part and the edge magnetic part, and the magnetic yoke is provided with the leakage hole.

[0024] Optionally, the sound-generating device also includes an elastic support member, which is arranged on a side of the second diaphragm away from the first diaphragm, and the elastic support member includes an external fixing part, a vibration arm and an internal fixing part which are connected in sequence, the external fixing part is fixed to the outer shell, the internal fixing part is fixed to the second vibration plate, and the internal fixing part is provided with a soldering pad electrically connected to the voice coil.

[0025] Optionally, the inner fixing portion includes a main body portion and an extension portion extending from the main body portion toward the voice coil and connected to the voice coil, the main body portion is connected to the second vibration plate, and a pad electrically connected to the voice coil is provided on the extension portion or the main body portion;

[0026] And / or, the magnetic circuit system includes a yoke and an inner magnetic part and an edge magnetic part arranged on the yoke, the magnetic gap is formed between the inner magnetic part and the edge magnetic part, and the yoke is provided with an avoidance structure for avoiding the inner fixed part, and the avoidance structure is a through hole.

[0027] Optionally, the outer shell includes a first shell and a second shell, the first shell and the second shell enclose the accommodating space, the outer edge of the first diaphragm is fixed to the first shell, the outer edge of the second diaphragm is clamped between the first shell and the second shell, and the first sound outlet is arranged in the first shell.

[0028] Optionally, the magnetic circuit system of the sound-generating device is exposed on the module housing, and the rear sound outlet channel is formed on the magnetic circuit system and / or the housing;

[0029] Alternatively, a rear sound cavity is formed between the module shell and the sound-emitting device, the rear sound outlet channel is provided on the module shell, the rear sound outlet channel connects the rear sound cavity and the electronic device cavity, and the diameter of the rear sound outlet channel is ≥2.0 mm.

[0030] Optionally, the effective volume of the electronic device cavity is ≥2.5cc.

[0031] In the sound device included in the sound module provided in the embodiment of the present application, since the second diaphragm and the middle diaphragm also vibrate in addition to the first diaphragm while the voice coil vibrates, the effective vibration area of ​​the vibration system is increased, thereby improving the acoustic performance of the sound device. In addition, the internal space of the sound module is connected to the electronic device cavity through the rear sound outlet channel, and the electronic device cavity is used to expand the rear cavity space of the sound module, which is conducive to the diffusion of the sound waves in the rear cavity, and reduces the reaction force of the vibration system when the air in the rear cavity is compressed during the vibration process when the effective vibration area is increased, thereby achieving large-amplitude vibration of the vibration system, improving the sound quality of the sound device, and reducing the power consumed by the sound module.

[0032] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0034] Figure 1a The figure shows a schematic diagram of the exploded structure of a sound-generating device in a sound-generating module according to an embodiment of the present application;

[0035] Figure 1b The figure shows a cross-sectional structural schematic diagram 1 of a sound-generating device in a sound-generating module according to an embodiment of the present application;

[0036] Figure 1c The figure shows a cross-sectional structure diagram of a sound device in a sound module according to an embodiment of the present application. Figure 2 ;

[0037] Figure 1d The figure shows a cross-sectional structure diagram of a sound device in a sound module according to an embodiment of the present application. Figure 3 ;

[0038] Figure 1e The figure shows a schematic diagram of the structure of a voice coil in a sound-generating device in a sound-generating module according to an embodiment of the present application;

[0039] Figure 1f The figure is a schematic diagram of the structure of an elastic support member in a sound-generating device in a sound-generating module according to an embodiment of the present application;

[0040] Figure 1g The figure shows a partial structural schematic diagram of a sound-generating device in a sound-generating module according to an embodiment of the present application;

[0041] Figure 1h The figure shows a partial structural decomposition diagram of a sound device in a sound module according to an embodiment of the present application;

[0042] Figure 1i The figure shows a schematic diagram of the overall structure of a sound-generating device in a sound-generating module according to an embodiment of the present application;

[0043] Figure 1j The figure shows the overall structure of a sound device in a sound module according to an embodiment of the present application. Figure 2 ;

[0044] Figure 2 The figure shows a schematic diagram of the structure of a sound module according to an embodiment of the present application;

[0045] Figure 3 The figure shows a schematic diagram of the structure of an electronic device according to an embodiment of the present application;

[0046] Figure 4 Shown is a schematic structural diagram of an electronic device according to an embodiment of the present application.

[0047] Description of reference numerals:

[0048] 1. Sound-generating device; 10. Shell; 101. First shell; 1011. First side wall; 1012. Inner bending wall; 102. Second shell; 100. First sound outlet; 11. First diaphragm; 111. First folding ring; 110. First flange; 112. First vibration plate; 1121. First protrusion; 1122. Second protrusion; 113. First bracket; 114. Second bracket; 12. Second diaphragm; 121. Second folding ring; 120. Second flange; 122. Second vibration plate; 1220. Inclined portion; 13. Intermediate diaphragm; 131. External connection portion; 132. Deformation portion; 133. Internal connection portion; 14. Voice coil; 140. First protrusion; 141. First side; 142. Connector edge connection; 15, elastic support member; 151, external fixing part; 152, internal fixing part; 1521, main body; 1522, extension part; 153, vibration arm; 150, conductive part; 16, internal magnetic part; 161, internal magnet; 1610, first sub-protrusion; 1611, first sub-edge; 162, internal magnetic plate; 1620, second sub-protrusion; 1621, second sub-edge; 17, edge magnetic part; 171, edge magnet; 1710, third sub-edge; 1711, first edge magnet; 1712, second edge magnet; 172, edge magnetic plate; 1720, fourth sub-edge; 1721, first edge magnetic plate; 1722, second edge magnetic plate; 18, yoke; 180, avoidance structure; 19, welding protrusion;

[0049] 2. Module shell; 20. Sound outlet; 21. Rear sound outlet channel; 22. Rear sound cavity; 3. Electronic device shell; 30. Electronic device cavity; 31. Electronic device sound outlet. DETAILED DESCRIPTION

[0050] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0051] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0052] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0053] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0054] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0055] Reference Figure 1a-Figure 2 As shown, according to an embodiment of the present application, a sound module is provided, the sound module includes a sound device 1 and a module housing 2, the sound device 1 includes a housing 10, a magnetic circuit system and a vibration system, the housing 10 has an accommodating space, and the housing 10 is provided with a first sound outlet 100; the magnetic circuit system is arranged in the accommodating space, and the magnetic circuit system has a magnetic gap;

[0056] The vibration system includes a first diaphragm 11, a second diaphragm 12, a middle diaphragm 13 and a voice coil 14. The first diaphragm 11 is arranged on a side of the housing 10 away from the magnetic circuit system, the second diaphragm 12 is arranged on a side of the first diaphragm 11 facing the magnetic circuit system, and the middle diaphragm 13 is arranged between the first diaphragm 11 and the second diaphragm 12. The voice coil 14 is at least partially arranged in the magnetic gap, and the voice coil 14 is connected to the first diaphragm 11, and the second diaphragm 12 and the middle diaphragm 13 are located outside the voice coil 14.

[0057] The outer edges of the second diaphragm 12 and the middle diaphragm 13 are connected to the housing 10, and the inner edges of the second diaphragm 12 and the middle diaphragm 13 are connected to the first diaphragm 11; a closed second sound cavity Q2 is formed between the second diaphragm 12 and the middle diaphragm 13, and the second sound cavity Q2 is connected to the first sound outlet 100;

[0058] The sound-generating device 1 is disposed in a module housing 2. A first sound-generating cavity Q1 is formed between the module housing 2 and the first diaphragm 11. The module housing has a sound outlet 20, which is connected to the first sound-generating cavity Q1.

[0059] The sound module is applied to an electronic device, which has an electronic device housing 3 to form an electronic device cavity 30, and the sound module is installed in the electronic device cavity 30; the sound module has a rear sound outlet channel 21, and the electronic device also has an electronic device sound outlet hole 31, the electronic device sound outlet hole 31 is connected to the sound outlet 20, and the rear sound outlet channel 21 is connected to the electronic device cavity 30.

[0060] In the sound-generating device 1 included in the sound-generating module provided in the embodiment of the present application, the magnetic circuit system is responsible for providing a constant magnetic field, and the voice coil 14 is placed in the constant magnetic field; when the audio current passes through the voice coil 14, the voice coil 14 is vibrated by the Ampere force in the magnetic field, thereby driving the first diaphragm 11 to vibrate and produce sound; and, since the second diaphragm 12 and the middle diaphragm 13 are both connected to the first diaphragm 11, the first diaphragm 11 will also drive the second diaphragm 12 and the middle diaphragm 13 to vibrate together with the same vibration direction while vibrating; a closed second sound-generating cavity Q2 is formed between the second diaphragm 12 and the middle diaphragm 13, and the vibrations of the first diaphragm 11, the second diaphragm 12 and the middle diaphragm 13 will push the sound waves of the second sound-generating cavity Q2 to radiate outward through the first sound outlet 100, thereby realizing the vibration and sound production of the sound-generating device 1.

[0061] In the sound device 1 included in the sound module provided in the embodiment of the present application, a second diaphragm 12 and a middle diaphragm 13 are added on the basis of the traditional first diaphragm 11 vibrating and emitting sound, and the second diaphragm 12 and the middle diaphragm 13 enclose a closed second sound cavity Q2, and the sound waves of the second sound cavity Q2 are radiated outward through the first sound outlet 100, thereby increasing the effective vibration area of ​​the vibration system, thereby increasing the FR (frequency response) of the sound device 1, and improving the acoustic performance of the sound device. That is, the sound device 1 increases the effective vibration area of ​​the vibration system, and the acoustic performance of the sound device 1 is improved under the same amplitude conditions compared with the conventional sound device without increasing the size of the sound device. In other words, if the sound device 1 maintains the same acoustic performance as the conventional sound device, the amplitude of the vibration system can be reduced, so that the size of the sound device 1 can be designed to be lightweight, thereby realizing the lightweight design of the sound module provided in the embodiment of the present application.

[0062] In addition, the sound module is provided with a rear sound outlet channel, and the rear sound outlet channel electronic device cavity 30; in this way, the electronic device cavity 30 is used to expand the rear cavity space of the sound module, which is beneficial to the diffusion of the sound waves in the rear cavity and reduces the reaction force exerted on the vibration system when the effective vibration area is increased and the air in the rear cavity is compressed during the vibration process, thereby realizing large-amplitude vibration of the vibration system, improving the sound quality of the sound module, and reducing the power consumed by the sound module; and, the larger cavity volume can provide better heat dissipation space, which helps to reduce the temperature of the sound module, thereby improving its stability and service life.

[0063] In one embodiment, if Figure 4As shown, the magnetic circuit system of the sound-emitting device is exposed on the module shell 2, and a rear sound outlet channel 21 is provided on the sound-emitting device. Optionally, a rear sound outlet channel may be provided on the magnetic circuit system of the sound-emitting device; or, a rear sound outlet channel may be provided on the outer shell of the sound-emitting device; or, a rear sound outlet channel may be provided on both the magnetic circuit system and the outer shell of the sound-emitting device. Specifically, when a rear sound outlet channel is provided on the magnetic circuit system of the sound-emitting device, the rear sound outlet channel 21 may be a leakage hole provided on the yoke 18. At this time, the electronic device cavity 30 is directly connected to the space on the rear side of the vibration system of the sound-emitting device, further improving the diffusion efficiency of the sound waves in the rear cavity, and more effectively reducing the reaction force on the compressed air in the rear cavity during the vibration process when the effective vibration area of ​​the vibration system is increased, thereby realizing large-amplitude vibration of the vibration system.

[0064] In other embodiments, Figure 3 As shown, a rear sound cavity 22 is formed between the module shell 2 and the sound-emitting device, and a rear sound outlet channel 21 is provided on the module shell 2. The rear sound outlet channel 21 connects the rear sound cavity 22 and the electronic device cavity 30, and the diameter of the rear sound outlet channel 21 is ≥2.0mm. Specifically, the rear sound outlet channel is a circular through hole, and the diameter of the through hole is greater than or equal to 2.0mm, which is more conducive to the diffusion of sound waves in the rear sound cavity 22 of the sound-emitting module. It should be noted that in this embodiment, it is not necessary to set a damping member or other structure to cover the rear sound outlet channel. The rear sound outlet channel 21 in this application has a different function from the traditional pressure equalizing hole.

[0065] Reference Figure 2 As shown, in one embodiment, the first sound hole 100 and the sound outlet 20 are opposite and connected; thereby ensuring that the sound waves of the second sound cavity Q2 can be directly radiated to the outside of the sound module through the first sound hole 100 and the sound outlet 20 without passing through an additional propagation path.

[0066] In one embodiment, the sound module has an air flow channel connecting the first sound hole 100 and the sound outlet 20 , and the second sound cavity Q2 is connected to the sound outlet 20 via the first sound hole 100 and the air flow channel.

[0067] In this specific example, the sound module may also have an air flow channel connecting the first sound outlet 100 and the sound outlet 20. The sound waves of the second sound cavity Q2 are first radiated to the outside of the sound device 1 to the air flow channel through the first sound outlet 100, and then radiated to the outside of the sound module through the air flow channel and the sound outlet 20; this can also ensure the effect of sound waves propagating to the outside of the sound module.

[0068] Reference Figure 1a , Figure 2As shown, in one embodiment, a first rear cavity H1 is formed between the first diaphragm 11 and the middle diaphragm 13, and a second rear cavity H2 is formed between the first diaphragm 11, the second diaphragm 12 and the housing 10; the first rear cavity H1 is connected to the second rear cavity H2.

[0069] In this specific example, the first rear cavity H1 and the second rear cavity H2 are connected, so as to facilitate the circulation of the internal airflow of the sound-generating device 1, improve the air pressure balance at different positions in the internal area of ​​the sound-generating device 1, and improve the vibration performance of the first diaphragm 11 and the second diaphragm 12. Furthermore, the magnetic circuit system is provided with a leakage hole, and the first rear cavity H1 and the second rear cavity H2 are both connected to the leakage hole provided by the magnetic circuit system, so as to realize the connection with the external space of the sound-generating device through the leakage hole, balance the air pressure inside and outside the sound-generating device 1, and improve the vibration performance of the vibration system.

[0070] In one embodiment, the first diaphragm 11, the second diaphragm 12, the housing 10 and the magnetic circuit system form a second rear cavity H2. Figure 1b to Figure 1d and Figure 2 As shown, the housing 10 is a ring structure with openings at both ends, the magnetic circuit system is connected to one end and covers the opening, and the first diaphragm 11, the second diaphragm 12, the housing 10 and the magnetic circuit system form a second rear cavity H2.

[0071] Reference Figure 1b to Figure 1d As shown, in one embodiment, the first diaphragm 11 includes a first fold ring 111 and a first vibration plate 112, the outer edge of the first fold ring 111 is connected to the housing 10, the inner edge of the first fold ring 111 is connected to the first vibration plate 112, the first vibration plate 112 is provided with a first protrusion 1121, the first protrusion 1121 is connected to the second diaphragm 12 and the middle diaphragm 13; the first protrusion 1121 is provided with a notch for connecting the first rear cavity H1 and the second rear cavity H2;

[0072] Alternatively, the first diaphragm 11 includes a first fold ring 111, a first vibration plate 112 and a first bracket 113, the outer edge of the first fold ring 111 is connected to the outer shell 10, the inner edge of the first fold ring 111 is connected to the first vibration plate 112, one end of the first bracket 113 is connected to the first vibration plate 112, and the other end of the first bracket 113 is connected to the second diaphragm 12 and the middle diaphragm 13; a notch is opened on the first bracket 113 for connecting the first rear cavity H1 and the second rear cavity H2.

[0073] In this specific example, the first diaphragm 11 can be in two structural forms: in the first structural form, the first diaphragm 11 includes a first fold ring 111 and a first vibration plate 112, the first vibration plate 112 is integrally formed with a first protrusion 1121, and the first diaphragm 11 is connected to the second diaphragm 12 and the middle diaphragm 13 through the first protrusion 1121. In this way, using the first protrusion 1121 as a connecting skeleton can save the setting of parts, reduce the assembly process of the sound-generating device 1, etc., and save production and manufacturing costs. In the second structural form, the first diaphragm 11 also includes a first bracket 113, and the first vibration plate 112 is connected to the second diaphragm 12 and the middle diaphragm 13 through the first bracket 113. In this way, the connection position of the second diaphragm 12 and the middle diaphragm 13 with the first diaphragm 11 can be flexibly adjusted by adjusting the height of the first bracket 113. The first diaphragm 11 of these two structural forms can ensure effective connection between the first diaphragm 11 and the second diaphragm 12 and the middle diaphragm 13 , thereby ensuring the integrity of the vibration system of the sound-generating device 1 .

[0074] It should be noted that when the first diaphragm 11 is connected to the second diaphragm 12 and the middle diaphragm 13 through the first protrusion 1121 of the first vibration plate 112, a notch for connecting the first rear cavity H1 and the second rear cavity H2 is provided on the first protrusion 1121, that is, the first protrusion 1121 is arranged at intervals on the first vibration plate. Or when the first diaphragm 11 is connected to the second diaphragm 12 and the middle diaphragm 13 through the first bracket 113, a notch for connecting the first rear cavity H1 and the second rear cavity H2 is opened on the first bracket 113.

[0075] Reference Figure 1b to Figure 1d As shown, in one embodiment, the first diaphragm 11 includes a first fold ring 111 and a first vibration plate 112, the outer edge of the first fold ring 111 is connected to the housing 10, and the inner edge of the first fold ring 111 is connected to the first vibration plate 112. Optionally, the first vibration plate 112 is provided with a second protrusion 1122, and the second protrusion 1122 is connected to the voice coil 14; or, the first diaphragm 11 further includes a second bracket 114, one end of the second bracket 114 is connected to the first vibration plate 112, and the other end of the second bracket 114 is connected to the voice coil 14.

[0076] In this specific example, the first diaphragm 11 can be connected to the voice coil 14 through two structural forms: in the first structural form, the first diaphragm 11 includes a first folding ring 111 and a first vibration plate 112, the first vibration plate 112 is integrally formed with a second protrusion 1122, and the first diaphragm 11 is connected to the voice coil 14 through the second protrusion 1122. In this way, using the second protrusion 1122 as a connecting skeleton can save the setting of parts, reduce the assembly process of the sound-generating device 1, and save production and manufacturing costs. In the second structural form, the first diaphragm 11 also includes a second bracket 114, and the first vibration plate 112 is connected to the voice coil 14 through the second bracket 114. In this way, the position of the voice coil 14 in the magnetic gap can be flexibly adjusted by adjusting the height of the second bracket 114. The first diaphragm 11 of these two structural forms can ensure the effective connection between the first diaphragm 11 and the voice coil 14, thereby ensuring that the voice coil 14 can effectively drive the first diaphragm 11 to vibrate and produce sound.

[0077] In summary, the first vibration plate 112 can be integrally formed with a first protrusion 1121 connected to the second diaphragm 12, or the first vibration plate 112 can be integrally formed with a second protrusion 1122 connected to the voice coil 14; or the first vibration plate 112 can also be connected to the second diaphragm 12 through the first bracket 113 or connected to the voice coil 14 through the second bracket 114.

[0078] Reference Figure 1a to Figure 1c As shown, in one embodiment, the second diaphragm 12 includes a second fold ring 121 and a second vibration plate 122, the outer side of the second fold ring 121 is connected to the outer shell 10, the inner side of the second fold ring 121 is connected to the outer side of the second vibration plate 122, and the inner side of the second vibration plate 122 is integrally bent and extends to the first diaphragm 11 and is connected to the first diaphragm 11.

[0079] Optionally, the inner side of the second vibration plate 122 includes an inclined portion 1220 disposed at a predetermined angle with the vibration direction.

[0080] In this specific example, the second diaphragm 12 includes a second folding ring 121 made of a flexible material and a second vibration plate 122 made of a rigid material, and the second folding ring 121 and the second vibration plate 122 are connected to each other. The second vibration plate 122 also serves as a skeleton connecting the first diaphragm 11 and the middle diaphragm 13, which facilitates the integration of the parts of the sound-generating device 1 and saves the internal volume of the sound-generating device 1. In addition, the inner side of the second vibration plate 122 includes an inclined portion 1220, and the setting of the inclined portion 1220 can improve the rigidity of the second vibration plate 122 in the horizontal direction (i.e., perpendicular to the vibration direction of the vibration system), thereby improving the vibration performance of the second diaphragm 12 and improving the feasibility of molding. At the same time, the inclined portion 1220 is further away from the magnetic circuit system relative to the inner edge of the second vibration plate 122, which can make the outer edge of the magnetic circuit system tilt outward and expand, thereby increasing the size of the magnetic circuit system and further improving the BL of the sound-generating device; and the inclined portion 1220 is more convenient for the positioning connection between the second vibration plate 122 and the second folding ring 121, and improves the connection accuracy. In this embodiment, the second vibration plate 122 can be made of magnesium-aluminum alloy, magnesium-lithium alloy, etc.

[0081] Reference Figure 1a to Figure 1c As shown, in one embodiment, the middle diaphragm 13 is a flexible member, and the middle diaphragm 13 includes an external connection portion 131, a deformation portion 132 and an internal connection portion 133. The external connection portion 131 is fixed to the outer shell 10, and the deformation portion 132 is located between the external connection portion 131 and the internal connection portion 133; the internal connection portion 133 is located between the inner edge of the first diaphragm 11 and the second vibration plate 122.

[0082] In this specific example, the middle diaphragm 13 is made of a flexible material as a whole, and its outer connection portion 131 is connected to the housing 10 to form a fixed end, and its effective vibration area for providing anti-phase sound waves is small, which has little impact on the performance of the vibration system, and the middle diaphragm 13 has an isolation and sealing function. Optionally, the middle diaphragm is a single-layer PEEK (polyetheretherketone) film, a composite PEEK (polyetheretherketone) film, etc.

[0083] In this embodiment, the inner connection portion 133 is arranged closer to the first diaphragm 11 than the outer connection portion 131, so that the volume of the second sound cavity Q2 can be increased and the acoustic performance of the sound-generating device 1 can be improved. Alternatively, the inner connection portion 133 is located between the first diaphragm 11 and the inner edge of the second vibration plate 122; or, the inner edge of the second vibration plate 122 is located between the first diaphragm 11 and the inner connection portion 133; so that the connection stability of the three can be improved. Alternatively, the inner edges of the inner connection portion 133 and the second vibration plate 122 are respectively connected to the first diaphragm 11, that is, the inner connection portion 133 and the inner edge of the second vibration plate 122 may not have a connection relationship, and both are connected to the first diaphragm 11. A variety of connection methods can be flexibly selected according to actual applications, and the present invention is not limited here.

[0084] In one embodiment, the middle diaphragm 13 is a flexible member, the effective vibration area of ​​the middle diaphragm 13 is smaller than the effective vibration area of ​​the second diaphragm 12, and the ratio of the effective vibration area of ​​the middle diaphragm 13 to the effective vibration area of ​​the second diaphragm 12 is 1:1.5 to 1:3;

[0085] In this specific example, when the sound-generating device 1 is working, the middle diaphragm 13 plays a negative role in pushing the volume of air, and the second diaphragm 12 plays a positive role in pushing the volume of air. By using the fact that the effective vibration area of ​​the middle diaphragm 13 is smaller than the effective vibration area of ​​the second diaphragm 12, the positive phase sound wave of the second sound-generating cavity Q2 can be increased, and the volume of air pushed when the sound-generating device 1 is working can be improved, thereby improving the sound quality. It should be noted that the middle diaphragm 13 is a flexible member, and the second diaphragm 12 includes a second folding ring 121 and a second vibration plate 122.

[0086] In one embodiment, the middle diaphragm 13 is a flexible member, and the compliance of the second fold ring 121 is smaller than the compliance of the middle diaphragm 13; in addition, the compliance of the first fold ring 111 is also smaller than the compliance of the middle diaphragm 13, that is, the compliance of the second fold ring 121 and the compliance of the first fold ring 111 are both smaller than the compliance of the middle diaphragm.

[0087] In this embodiment, the middle diaphragm 13 has greater compliance and only serves to form a closed second sound cavity Q2 with the second diaphragm 12. It will not affect the vibration performance of the first diaphragm 11 and the second diaphragm 12, thereby improving the low-frequency sensitivity of the sound-generating device 1.

[0088] In one embodiment, the middle diaphragm 13 is a flexible member, and the second diaphragm 12 includes a second fold ring 121 and a second vibration plate 122. In the projection along the vibration direction, the width of the deformation portion of the middle diaphragm 13 is greater than or equal to the width of the deformation portion of the second fold ring 121, and the ratio of the width of the deformation portion of the middle diaphragm 13 to the width of the deformation portion of the second fold ring 121 is 1:1-3:1.

[0089] In this specific example, the width of the deformation portion of the middle diaphragm 13 is greater than or equal to the width of the deformation portion of the second fold ring 121 , which helps to improve the compliance of the middle diaphragm 13 .

[0090] Reference Figure 1b As shown, in one embodiment, the first diaphragm 11 includes a first fold ring 111, and the middle diaphragm 13 includes a deformation portion 132. The first fold ring 111 protrudes in a direction away from the second diaphragm 12, and the deformation portion 132 protrudes in a direction close to the second diaphragm 12; in this way, the middle diaphragm 13 and the first diaphragm 11 will not interfere with each other during vibration, and it is convenient to set the middle diaphragm 13 to a position closer to the accommodating space, thereby further reducing the effective vibration area of ​​the middle diaphragm 13.

[0091] In one embodiment, the middle diaphragm 13 includes a deformation portion 132, the second fold ring 121 protrudes in a direction close to the first diaphragm 11, the deformation portion 132 protrudes in a direction away from the first diaphragm 11, and the second fold ring 121 and the deformation portion 132 are staggered in a horizontal direction, and the horizontal direction is perpendicular to the vibration direction. In this way, the vibration space of the middle diaphragm 13 and the second diaphragm 12 is ensured, so that the middle diaphragm 13 and the second diaphragm 12 will not interfere with each other during the vibration process.

[0092] In the above embodiment, when the first diaphragm 11 , the second diaphragm 12 and the deformable portion 132 of the middle diaphragm 13 vibrate together, there is no mutual interference between the three, thereby ensuring that the sound-generating device 1 has excellent sound quality.

[0093] Reference Figure 1a As shown, in one embodiment, the magnetic circuit system includes a yoke 18 and an inner magnetic portion 16 and an edge magnetic portion 17 arranged on the yoke 18, the edge magnetic portion 17 is located on the outside of the inner magnetic portion 16, and a magnetic gap is formed between the inner magnetic portion 16 and the edge magnetic portion 17. The yoke 18 is provided with a leakage hole, which connects the first rear cavity H1 and the second rear cavity H2.

[0094] In this specific example, the inner magnetic part 16 is located at the center of the magnetic circuit system, and the side magnetic part 17 is arranged around the inner magnetic part 16, and the two are used to generate a magnetic field. The inner magnetic part 16 and the side magnetic part 17 are both installed on the yoke 18, and the yoke 18 is not only used to fix the inner magnetic part 16 and the side magnetic part 17, but also used to correct the magnetic lines of force. In addition, when the sound-generating device 1 is applied to a module, since the leakage hole provided by the yoke 18 connects the first rear cavity H1 and the second rear cavity H2, the air pressure of the first rear cavity H1 and the second rear cavity H2 and the external space can be balanced, so that the air pressure on both sides of the first diaphragm 11 is more balanced, and the vibration stability of the first diaphragm 11 is maintained. At the same time, the first rear cavity H1 and the second rear cavity H2 are further connected to the electronic device cavity 30 through the rear sound outlet channel. The electronic device cavity 30 is used to expand the rear cavity space of the sound-emitting device, which is beneficial to the diffusion of the rear cavity sound waves and reduces the reaction force exerted on the vibration system when the effective vibration area is increased and the air in the rear cavity is compressed during the vibration process. This can achieve large-amplitude vibration of the vibration system, improve the sound quality of the sound-emitting device, and reduce the power consumed by the sound-emitting device.

[0095] Reference Figure 1aAs shown, in one embodiment, the sound-generating device 1 also includes an elastic support member 15, which is arranged on a side of the second diaphragm 12 away from the first diaphragm 11, and the elastic support member 15 includes an external fixing portion 151, a vibration arm 153 and an internal fixing portion 152 connected in sequence, the external fixing portion 151 is fixed to the outer shell 10, the internal fixing portion 152 is fixed to the second vibration plate 122, and the internal fixing portion 152 is provided with a solder pad electrically connected to the voice coil 14.

[0096] In this specific example, the outer fixing portion 151 of the elastic support member 15 is connected to the housing 10, and the inner fixing portion 152 is connected to the second vibration plate 122 and the voice coil 14. The elastic support member 15 ensures the stability of the connection between the voice coil 14 and the housing 10; and a gap is provided between the outer fixing portion 151 and the vibration arm 153 to ensure that the inner fixing portion 152 and the vibration arm 153 can vibrate freely under the action of the voice coil 14, while not hindering the free vibration of the voice coil 14 in the magnetic gap. The structural design between the outer fixing portion 151, the vibration arm 153 and the inner fixing portion 152 ensures the stability of the structure and the transmission efficiency of the vibration. The provision of the elastic support member 15 not only provides an electrical connection path between the voice coil 14 and the external circuit system; and the elastic support member 15 also helps to improve the vibration stability of the vibration system and reduce polarization.

[0097] Furthermore, the internal fixing portion 152 includes a main body portion 1521 and an extension portion 1522 extending from the main body portion 1521 toward the voice coil 14 and connected to the voice coil 14, the main body portion 1521 is connected to the second vibration plate 122, and the extension portion 1522 or the main body portion 1521 is provided with a soldering pad electrically connected to the voice coil 14; the soldering pad provided on the main body portion 1521 or the extension portion 1522 of the internal fixing portion 152 facilitates electrical connection with the voice coil 14.

[0098] In one embodiment, the magnetic circuit system includes a yoke 18 and an inner magnetic part 16 and an edge magnetic part 17 disposed on the yoke 18, the edge magnetic part 17 is located outside the inner magnetic part 16, a magnetic gap is formed between the inner magnetic part 16 and the edge magnetic part 17, and the yoke 18 is provided with an avoidance structure 180 for avoiding the inner fixed part 152, the avoidance structure 180 is a through hole, and the through hole serves as a leakage hole of the sound-generating device. It can be clearly seen that the leakage hole connects the internal space and the external space of the sound-generating device.

[0099] In this specific example, the inner magnetic part 16 is located at the center of the magnetic circuit system, and the side magnetic part 17 is arranged around the inner magnetic part 16, and the two are used to generate a magnetic field. The inner magnetic part 16 and the side magnetic part 17 are both installed on the yoke 18, and the yoke 18 is not only used to fix the inner magnetic part 16 and the side magnetic part 17, but also used to correct the magnetic lines of force. The setting of the leakage hole can not only connect the internal space and the external space of the sound-emitting device, that is, connect the first rear cavity H1, the second rear cavity H2 and the external space, but also avoid the internal fixed part 152, so as to help avoid the interference of the yoke 18 on the vibration of the internal fixed part 152 following the voice coil 14, and balance the internal and external air pressures of the sound-emitting device.

[0100] Further, refer to Figure 1f As shown, the sound-generating device 1 is rectangular, and the number of internal fixing parts 152 is four, and the four internal fixing parts 152 are respectively connected to the four corners of the voice coil 14. The four internal fixing parts 152 are all arranged on the inner side of the external fixing part 151. A gap is arranged between the vibration arm 153 and the external fixing part 151 to ensure that the vibration arm 153 can vibrate freely under the action of the voice coil 14. In addition, the outer side of the external fixing part 151 is also connected to a conductive part 150 for providing electrical connection between the voice coil 14 and the external circuit system. It can be seen that the sound-generating device 1 includes two opposite long axis sides and a short axis side connecting the two long axis sides, and the vibration arm 153 is led out from the short axis side and extends along the long axis side. This helps to increase the length of the vibration arm of the elastic support 15, and its reliability is guaranteed when the sound-generating device works with a large amplitude.

[0101] Optionally, the elastic support member 15 may be an integral structure; or, the elastic support member 15 may include two or four separate discrete structures.

[0102] In one embodiment, the effective volume of the electronic device cavity 30 is ≥ 2.5 cc.

[0103] In the electronic device to which the sound module of the embodiment of the present application is applied, the effective volume of the electronic device cavity 30 is ≥2.5cc, which can more effectively expand the back cavity space of the sound module, is beneficial to the diffusion of the sound waves in the back cavity, and reduces the reaction force exerted on the vibration system when the effective vibration area is increased and the air in the back cavity is compressed during the vibration process, thereby realizing large-amplitude vibration of the vibration system, improving the sound quality of the sound device, and reducing the power consumed by the sound module; and, a larger cavity volume can provide better heat dissipation space, which helps to reduce the temperature of the sound module, thereby improving its stability and service life.

[0104] Reference Figure 1a , Figure 1e , Figure 1gAs shown, in one embodiment, the magnetic circuit system includes a yoke 18 and an inner magnetic portion 16 and a side magnetic portion 17 disposed on the yoke 18, the side magnetic portion 17 is disposed on the outer side of the inner magnetic portion 16, a magnetic gap is formed between the inner magnetic portion 16 and the side magnetic portion 17, the side magnetic portion 17 is provided with a notch, and the voice coil 14 has a first protrusion 140 extending into the notch. Further optionally, the inner magnetic portion 16 has a second protrusion, and the second protrusion is disposed corresponding to the first protrusion 140.

[0105] In this specific example, the first protrusion 140 on the voice coil 14 can reduce the distance between the voice coil 14 and the second diaphragm 12, making it easier to connect and assemble the elastic support 15 and the voice coil 14. The inner magnetic part 16 is provided with a second protrusion, which is arranged corresponding to the first protrusion 140. By matching the shape of the inner magnetic part 16 with the voice coil 14, the voice coil 14 can effectively utilize the magnetic field gap at the corner of the magnetic circuit system, thereby increasing the BL of the sound-generating device 1 and improving its acoustic performance as a whole.

[0106] Reference Figure 1h As shown, in one embodiment, the inner magnetic part 16 includes an inner magnet 161 and an inner magnetic conductive plate 162 whose shapes and sizes match each other. The inner magnet 161 is sandwiched between the inner magnetic conductive plate 162 and the magnetic yoke 18. The second protrusion includes both a protrusion formed by extending the inner magnet 161 and a protrusion formed by extending the inner magnetic conductive plate 162. In addition, the first protrusion 140 includes a first edge 141 and a connecting edge 142. The number of first edges 141 is two, the two first edges 141 are arranged opposite to each other, and the connecting edge 142 is connected between the two first edges 141; the second protrusion is formed with a second edge opposite to the first edge 141, and the first edge 141 and the second edge are arranged in parallel.

[0107] Specifically, the inner magnet 161 extends to form a first sub-protrusion 1610, the inner magnetic conductive plate 162 extends to form a second sub-protrusion 1620, and the first protrusion 140, the first sub-protrusion 1610 and the second sub-protrusion 1620 are all arranged correspondingly.

[0108] In this specific example, the inner magnetic portion 16 includes an inner magnet 161 and an inner magnetic conductive plate 162, and the shapes of the inner magnet 161 and the inner magnetic conductive plate 162 are matched with the voice coil 14, thereby further ensuring the compatibility of the voice coil 14 and the magnetic circuit system, and improving the utilization rate of the voice coil 14 of the magnetic field gap formed in the magnetic circuit system.

[0109] Reference Figure 1hAs shown, in one embodiment, the first sub-protrusion 1610 has two first sub-edges 1611 arranged opposite to each other, the second sub-protrusion 1620 has two second sub-edges 1621 arranged opposite to each other, the first sub-edge 1611 and the second sub-edge 1621 together constitute the second edge, the first sub-edge 1611 and the second sub-edge 1621 together constitute the second edge, and the first edge 141, the first sub-edge 1611 and the second sub-edge 1621 are arranged in parallel.

[0110] In this specific example, the first sub-side 1611 of the first sub-protrusion 1610 and the second sub-side 1621 of the second sub-protrusion 1620 are both arranged parallel to the first side 141 of the voice coil 14, which helps to maintain the uniformity of the magnetic gap and thus ensure the stable movement of the voice coil 14 in the magnetic gap.

[0111] Furthermore, the edge magnet portion 17 includes an edge magnet 171 and an edge magnetic conductive plate 172, and the gap includes both a gap structure formed by the edge magnet 171 and a gap structure formed by the edge magnetic conductive plate 172. In addition, the edge magnet portion 17 includes two opposite third sides at the gap, wherein the third sides are parallel to the first side 141. In this way, the width of the magnetic gap can be ensured to be uniform, so that the voice coil 14 vibrates in a stable magnetic field.

[0112] Specifically, refer to Figure 1h As shown, the edge magnet 171 has two third sub-edges 1710 arranged opposite to each other at its notch, and the edge magnetic conductive plate 172 has two fourth sub-edges 1720 arranged opposite to each other at its notch. The third sub-edge 1710 and the fourth sub-edge 1720 together constitute the third edge, and the third sub-edge 1710, the fourth sub-edge 1720 and the first edge 141 are arranged in parallel.

[0113] More specifically, refer to Figure 1e As shown, the voice coil 14 is roughly rectangular, so that the shape of the voice coil 14 better matches the outline of the sound-generating device. The four first protrusions 140 are respectively located at the four corners of the rectangle, so that stress concentration is not easy to occur in the voice coil 14, thereby improving the service life of the voice coil 14.

[0114] More specifically, the shapes of the inner magnet 161 and the inner magnetic conductive plate 162 are both matched with the voice coil 14, that is, the inner magnet 161 and the inner magnetic conductive plate 162 are both roughly rectangular, and the protrusions formed by the extension of the inner magnet 161 are arranged at the four corners, and the protrusions formed by the extension of the inner magnetic conductive plate 162 are also arranged at the four corners. That is, the first sub-protrusions 1610 are arranged at the four corners, and the second sub-protrusions 1620 are also arranged at the four corners.

[0115] More specifically, refer to Figure 1hAs shown, the number of the side magnets 171 and the side magnetic conductive plates 172 is four. More specifically, the side magnets 171 include two first side magnets 1711 and two second side magnets 1712; the side magnetic conductive plates 172 include two first side magnetic conductive plates 1721 and two second side magnetic conductive plates 1722. The two first side magnets 1711 and the two first side magnetic conductive plates 1721 correspond to the long sides of the rectangle of the voice coil 14, and their lengths are longer; the two second side magnets 1712 and the two second side magnetic conductive plates 1722 correspond to the short sides of the rectangle of the voice coil 14, and their lengths are shorter.

[0116] In the sound-generating device 1, since the shape of the voice coil 14 is the above-mentioned special-shaped design, and the shape of the magnetic circuit system is adapted to the voice coil, the voice coil 14 can effectively utilize the gap at the notch structure of the edge magnetic portion 17, and when the voice coil size is small, the length of the voice coil line can be effectively increased, and the BL value can be improved, thereby improving the overall performance of the sound-generating device 1.

[0117] Reference Figure 1a to Figure 1c As shown, in one embodiment, the housing 10 includes a first shell 101 and a second shell 102, the first shell 101 and the second shell 102 enclose an accommodating space, the outer edge of the first diaphragm 11 is fixed to the first shell 101, the outer edge of the second diaphragm 12 is clamped between the first shell 101 and the second shell 102, and the first sound outlet 100 is provided in the first shell 101.

[0118] In this specific example, the housing 10 includes a first housing 101 and a second housing 102, and the outer edge of the second diaphragm 12 is sandwiched between the first housing 101 and the second housing 102; such a configuration helps to simplify the assembly process of the sound-generating device, improve production efficiency, and enhance the connection reliability of the second diaphragm 12. In addition, the outer edge of the second diaphragm 12 is sandwiched between the first housing 101 and the second housing 102, so that the height of the housing 10 can be adjusted accordingly according to the amplitude requirements of the sound-generating device 1, so as to increase or decrease the vibration space between the middle diaphragm 13 and the second diaphragm 12, so as to meet the needs of different products.

[0119] Reference Figure 1b As shown, in one embodiment, the first shell 101 includes a first side wall 1011 and an inner bending wall 1012, the inner bending wall 1012 is formed by the first side wall 1011 bending and extending into the accommodating space, the outer edge of the first diaphragm 11 and the outer edge of the middle diaphragm 13 are fixed to the inner bending wall 1012, and the first sound outlet 100 is opened in the first side wall 1011 or the inner bending wall 1012 of the first shell 101.

[0120] In this specific example, the first shell 101 further includes a first side wall 1011 and an inner bending wall 1012, and the inner bending wall 1012 provides effective support and connection for the outer edge of the first diaphragm 11 and the outer edge of the middle diaphragm 13; and the outer edge of the second diaphragm 12 is clamped between the first side wall 1011 and the second shell 102, and the first side wall 1011 provides effective support and connection for the outer edge of the second diaphragm 12.

[0121] In this embodiment, the outer edge of the middle diaphragm 13 and the outer edge of the first diaphragm 11 are both fixed to the outside of the inner bending wall 1012, or the outer edge of the middle diaphragm 13 and the outer edge of the first diaphragm 11 are respectively fixed to the inner and outer sides of the inner bending wall 1012. This is not limited here and can be flexibly selected according to actual conditions.

[0122] In this embodiment, the first diaphragm 11 also includes a first flange 110 located outside the outer edge of the first diaphragm 11, and the first flange 110 is connected to the first side wall 1011; this can improve the connection stability of the first diaphragm 11 and the waterproof effect of the sound-generating device 1.

[0123] In this embodiment, the second diaphragm 12 also includes a second flange 120 located outside the outer edge of the second diaphragm 12, and the second flange 120 is connected to the first side wall 1011 or the second shell 102; this can improve the connection stability of the second diaphragm 12 and the waterproof effect of the sound-emitting device 1.

[0124] In this embodiment, the first housing 101 is made of metal, which can further increase the accommodation space of the sound device 1 and improve the heat dissipation performance of the sound device 1. The second housing 102 can be made of metal or plastic. The second housing 102 is made of metal, which can further increase the accommodation space of the sound device 1 and improve the heat dissipation performance of the sound device 1. Figure 1i-1j As shown, the yoke 18 is welded to the first shell 101 or the second shell 102 to improve the connection stability between the magnetic circuit system and the housing 10. Specifically, the yoke 18 has a welding protrusion 19 extending toward the first shell 101 or the second shell 102; or, the first shell 101 or the second shell 102 has a welding protrusion 19 extending toward the yoke 18; or, the welding connection between the first shell 101 or the second shell 102 and the yoke 18 is achieved by a welding sheet.

[0125] Reference Figure 1a , Figure 1bAs shown, in one embodiment, the sound-emitting device also includes an elastic support member 15 arranged between the second shell 102 and the second diaphragm 12, and the elastic support member 15 includes an external fixing portion 151, a vibration arm 153 and an internal fixing portion 152 which are connected in sequence, the external fixing portion 151 is clamped between the outer edge of the second diaphragm 12 and the second shell 102, and the internal fixing portion 152 is connected to the inner edge of the second diaphragm 12.

[0126] In this specific example, the elastic support member 15 is connected to the inner edge of the second diaphragm 12, and the inner edge of the second diaphragm 12 is connected to the first diaphragm 11, ensuring that the elastic support member 15 realizes the upper and lower constraints of the vibration system, improves the vibration consistency, and reduces the risk of poor product performance caused by polarization of the vibration system under large amplitude.

[0127] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A sound module, characterized in that: The sound module comprises: A sound-generating device, the sound-generating device comprising a housing, a magnetic circuit system and a vibration system, the housing having a housing space, the housing having a first sound outlet; the magnetic circuit system being arranged in the housing space, the magnetic circuit system having a magnetic gap; The vibration system comprises a first diaphragm, a second diaphragm, a middle diaphragm and a voice coil, wherein the first diaphragm is arranged on a side of the housing away from the magnetic circuit system, the second diaphragm is arranged on a side of the first diaphragm facing the magnetic circuit system, and the middle diaphragm is arranged between the first diaphragm and the second diaphragm; the voice coil is at least partially arranged in the magnetic gap, and the voice coil is connected to the first diaphragm, and the second diaphragm and the middle diaphragm are located outside the voice coil; The outer edges of the second diaphragm and the middle diaphragm are connected to the housing, and the inner edges of the second diaphragm and the middle diaphragm are connected to the first diaphragm; a closed second sound cavity is formed between the second diaphragm and the middle diaphragm, and the second sound cavity is connected to the first sound outlet hole; A module housing, wherein the sound-generating device is disposed in the module housing, a first sound-generating cavity is formed between the module housing and the first diaphragm, and the module housing has a sound outlet, and the sound outlet is communicated with the first sound-generating cavity; The sound module is applied to an electronic device, the sound module has a rear sound outlet channel, the electronic device has an electronic device cavity and an electronic device sound outlet hole, the electronic device sound outlet hole is connected to the sound outlet, and the rear sound outlet channel is connected to the electronic device cavity.

2. The sound module according to claim 1, characterized in that: The sound module has an air flow channel connecting the first sound hole and the sound outlet, and the second sound cavity is connected to the sound outlet via the first sound hole and the air flow channel.

3. The sound module according to claim 1, characterized in that: The first sound outlet hole and the sound outlet are directly opposite to and connected with each other.

4. The sound module according to claim 1, characterized in that: A first rear cavity is formed between the first diaphragm and the middle diaphragm, and a second rear cavity is formed between the first diaphragm, the second diaphragm and the housing; the first rear cavity is connected to the second rear cavity.

5. The sound module according to claim 4, characterized in that: The first diaphragm includes a first fold ring and a first vibration plate, the outer edge of the first fold ring is connected to the housing, the inner edge of the first fold ring is connected to the first vibration plate, the first vibration plate is provided with a first protrusion, the first protrusion is connected to the second diaphragm and the middle diaphragm; the first protrusion is provided with a notch for connecting the first rear cavity and the second rear cavity; Alternatively, the first diaphragm includes a first fold ring, a first vibration plate and a first bracket, the outer edge of the first fold ring is connected to the outer shell, the inner edge of the first fold ring is connected to the first vibration plate, one end of the first bracket is connected to the first vibration plate, and the other end of the first bracket is connected to the second diaphragm and the middle diaphragm; the first bracket is provided with a notch for connecting the first rear cavity and the second rear cavity.

6. The sound module according to claim 1, characterized in that: The second diaphragm includes a second folded ring and a second vibration plate, the outer side of the second folded ring is connected to the outer shell, the inner side of the second folded ring is connected to the outer side of the second vibration plate, and the inner side of the second vibration plate is integrally bent and extends to the first diaphragm and is connected to the first diaphragm.

7. The sound module according to claim 6, characterized in that: The inner side of the second vibration plate includes an inclined portion arranged at a predetermined angle with the vibration direction.

8. The sound module according to claim 6, characterized in that: The middle diaphragm is a flexible member, and includes an outer connection portion, a deformation portion, and an inner connection portion, wherein the outer connection portion is fixed to the outer shell, and the deformation portion is located between the outer connection portion and the inner connection portion; the inner connection portion is located between the inner edge of the first diaphragm and the second vibration plate; And / or, the middle diaphragm is a flexible member, the effective vibration area of ​​the middle diaphragm is smaller than the effective vibration area of ​​the second diaphragm, and the ratio of the effective vibration area of ​​the middle diaphragm to the effective vibration area of ​​the second diaphragm is 1:1.5 to 1:3; And / or, the middle diaphragm is a flexible member, and the compliance of the second folding ring is smaller than the compliance of the middle diaphragm.

9. The sound module according to claim 6, characterized in that: The first diaphragm includes a first fold ring, the middle diaphragm includes a deformation portion, the first fold ring protrudes in a direction away from the second diaphragm, and the deformation portion protrudes in a direction close to the second diaphragm; And / or, the middle diaphragm includes a deformation portion, the second fold ring protrudes in a direction close to the first diaphragm, the deformation portion protrudes in a direction away from the first diaphragm, and the second fold ring and the deformation portion are staggered in a horizontal direction.

10. The sound module according to claim 6, characterized in that: The sound-generating device also includes an elastic support member, which is arranged on a side of the second diaphragm away from the first diaphragm, and the elastic support member includes an external fixing part, a vibration arm and an internal fixing part which are connected in sequence, the external fixing part is fixed to the outer shell, the internal fixing part is fixed to the second vibration plate, and the internal fixing part is provided with a soldering pad electrically connected to the voice coil.

11. The sound module according to claim 10, characterized in that: The inner fixing part includes a main body and an extension part extending from the main body toward the voice coil and connected to the voice coil, the main body is connected to the second vibration plate, and a pad electrically connected to the voice coil is provided on the extension part or the main body; And / or, the magnetic circuit system includes a yoke and an inner magnetic part and an edge magnetic part arranged on the yoke, the magnetic gap is formed between the inner magnetic part and the edge magnetic part, and the yoke is provided with an avoidance structure for avoiding the inner fixed part, and the avoidance structure is a through hole.

12. The sound module according to claim 1, characterized in that: The outer shell includes a first shell and a second shell, the first shell and the second shell enclose the accommodating space, the outer edge of the first diaphragm is fixed to the first shell, the outer edge of the second diaphragm is clamped between the first shell and the second shell, and the first sound outlet is provided in the first shell.

13. The sound module according to any one of claims 1 to 12, characterized in that: The magnetic circuit system of the sound-generating device is exposed on the module housing, and the rear sound outlet channel is formed on the magnetic circuit system and / or the housing; Alternatively, a rear sound cavity is formed between the module shell and the sound-emitting device, the rear sound outlet channel is provided on the module shell, the rear sound outlet channel connects the rear sound cavity and the electronic device cavity, and the diameter of the rear sound outlet channel is ≥2.0 mm.

14. The sound module according to any one of claims 1 to 12, characterized in that: The effective volume of the electronic device cavity is ≥2.5cc.

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