Sound production device and sound production module

Abstract

The invention discloses a sound production device and a sound production module, 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 magnetic circuit system has a magnetic gap; 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 the side, away from the magnetic circuit system, of the shell, the second vibrating diaphragm is arranged on the side, facing the magnetic circuit system, of the first vibrating diaphragm, the middle diaphragm is arranged between the first vibrating diaphragm and the second vibrating diaphragm, and the middle diaphragm is a flexible part; the voice coil is at least partially arranged in the magnetic gap and connected with the first diaphragm, and the second diaphragm and the middle diaphragm are located on the outer side of the voice coil; the first vibrating diaphragm comprises a first folding ring and a first vibrating plate, the outer edge of the first folding ring is connected with the shell, the inner edge of the first folding ring is connected with the first vibrating plate, the second vibrating diaphragm comprises a second folding ring and a second vibrating plate, the outer side of the second folding ring is connected with the shell, and the inner side part of the second vibrating plate is integrally bent, extends to the first vibrating diaphragm and is connected with the first vibrating plate.

Description

Technical Field

[0001] The present application relates to the technical field of electronic products, and more specifically, to a sound-generating device and a sound-generating 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 object of the present application is to provide a new technical solution for a sound-generating device.

[0005] According to a first aspect of the present application, a sound-generating device and a sound-generating module are provided, wherein the sound-generating device comprises:

[0006] A housing, wherein the housing has a containing space and is provided with a first sound outlet;

[0007] A magnetic circuit system, the magnetic circuit system is arranged in the accommodating space, and the magnetic circuit system has a magnetic gap;

[0008] A vibration system, the vibration system comprising a first diaphragm, a second diaphragm, a middle diaphragm and a voice coil, the first diaphragm being arranged on a side of the housing away from the magnetic circuit system, the second diaphragm being arranged on a side of the first diaphragm facing the magnetic circuit system, the middle diaphragm being arranged between the first diaphragm and the second diaphragm, and the middle diaphragm being a flexible member;

[0009] The voice coil is at least partially disposed 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;

[0010] 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; wherein,

[0011] 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 outer shell, and the inner edge of the first folding ring is connected to the first vibration plate; the second diaphragm includes a second folding ring and a second vibration plate, the outer side of the second folding ring is connected to the outer shell, the inner side of the second folding 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 vibration plate.

[0012] Optionally, the inner side of the second vibration plate includes an inclined portion arranged at a predetermined angle to the vibration direction.

[0013] Optionally, the predetermined angle is 5° to 85°.

[0014] Optionally, the middle diaphragm includes an external connection part, a deformation part and an internal connection part, the deformation part is located between the external connection part and the internal connection part, the external connection part is connected to the outer shell, and the internal connection part is connected to the first vibration plate.

[0015] Optionally, the inner connecting portion is arranged closer to the first diaphragm than the outer connecting portion; or, the inner connecting portion is located between the inner edges of the first vibration plate and the second vibration plate; or, the inner edge of the second vibration plate is located between the first vibration plate and the inner connecting portion; or, the inner connecting portion and the inner edge of the second vibration plate are respectively connected to the first vibration plate.

[0016] Optionally, the first folding ring protrudes in a direction away from the second diaphragm, and the deformation portion protrudes in a direction close to the second diaphragm;

[0017] And / or, the second fold ring protrudes in a direction approaching 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.

[0018] Optionally, the first vibration plate is provided with a first protrusion, and the first protrusion is connected to the second vibration plate and the middle diaphragm;

[0019] Alternatively, the first diaphragm further includes a first bracket, 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 vibration plate and the middle diaphragm.

[0020] Optionally, the first vibration plate is provided with a second protrusion, and the second protrusion is connected to the voice coil;

[0021] Alternatively, the first diaphragm further includes a second bracket, one end of the second bracket is connected to the first vibration plate, and the other end of the second bracket is connected to the voice coil.

[0022] Optionally, the compliance of the second fold ring and the compliance of the first fold ring are both smaller than the compliance of the middle diaphragm;

[0023] And / or, the effective vibration area of ​​the middle diaphragm is smaller than the effective vibration area of ​​the second diaphragm.

[0024] 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 fold ring is fixed to the first shell, the outer edge of the second fold ring is clamped between the first shell and the second shell, and the first sound outlet is arranged in the first shell.

[0025] Optionally, the first shell includes a first side wall and an inner bending wall bent from the first side wall into the accommodating space, and the outer edge of the first folding ring and the outer edge of the middle diaphragm are fixed to the inner bending wall.

[0026] Optionally, the outer edge of the first fold ring and the outer edge of the middle diaphragm are both fixed to the outside of the inner bending wall or are respectively fixed to the opposite sides of the inner bending wall;

[0027] And / or, the first diaphragm further comprises a first flange located outside the outer edge of the first fold, and the first flange is connected to the first side wall;

[0028] And / or, the second diaphragm further includes a second flange located outside the outer edge of the second fold ring, and the second flange is connected to the first side wall or the second shell.

[0029] Optionally, the magnetic circuit system includes a yoke and an inner magnetic part and an edge magnetic part arranged on the yoke, the edge magnetic part is arranged on the outer side of the inner magnetic part, and the magnetic gap is formed between the inner magnetic part and the edge magnetic part.

[0030] According to a second aspect of the present application, a sound module is provided, which includes the sound device as described in the first aspect; and also includes a module shell, a first sound cavity is formed between the module shell and the first diaphragm, the module shell has a sound outlet, and the first sound cavity is connected to the sound outlet.

[0031] In the sound-generating device provided in the embodiment of the present application, since the voice coil vibrates, in addition to the first diaphragm, the second diaphragm and the middle diaphragm also vibrate, thereby increasing the effective vibration area of ​​the vibration system and further improving the acoustic performance of the sound-generating device.

[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 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 according to an embodiment of the present application;

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

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

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

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

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

[0043] Figure 1j The figure shows the overall structure of a sound-generating device 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. Middle diaphragm; 131. External connection portion; 132. Deformation portion; 133. Internal connection portion; 14. Voice coil; 140. First protrusion; 141. first side; 142, connecting side; 15, elastic support member; 151, external fixing part; 152, internal fixing part; 153, vibration arm; 150, conductive part; 16, internal magnetic part; 161, internal magnet; 1610, first sub-protrusion; 1611, first sub-side; 162, internal magnetic plate; 1620, second sub-protrusion; 1621, second sub-side; 17, side magnetic part; 171, side magnet; 1710, third sub-side; 1711, first side magnet; 1712, second side magnet; 172, side magnetic plate; 1720, fourth sub-side; 1721, first side magnetic plate; 1722, second side 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 as part of the specification.

[0053] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as 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-generating device 1 is provided, the sound-generating device 1 comprises a housing 10, a magnetic circuit system and a vibration system, the housing has a containing space, and the housing is provided with a first sound outlet 100; the magnetic circuit system is arranged in the containing 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, the middle diaphragm 13 is arranged between the first diaphragm 11 and the second diaphragm 12, and the middle diaphragm 13 is a flexible member.

[0057] The voice coil 14 is at least partially disposed 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 ;

[0058] The outer edges of the second diaphragm 12 and the middle diaphragm 13 are connected to the outer shell 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.

[0059] In the sound-generating device 1 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 sound generation of the sound-generating device.

[0060] In the sound-emitting device 1 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-emitting cavity Q2, and the sound waves of the second sound-emitting 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 (frequent response) of the sound-emitting device, and improving the acoustic performance of the sound-emitting device. That is, the sound-emitting device 1 provided in the embodiment of the present application increases the effective vibration area of ​​the vibration system, and the acoustic performance of the sound-emitting device 1 is improved under the same amplitude conditions compared with the conventional sound-emitting device without increasing the size of the sound-emitting device. In other words, if the sound-emitting device 1 provided in the embodiment of the present application maintains the same acoustic performance as the conventional sound-emitting device, the amplitude of the vibration system can be reduced, so that the size of the sound-emitting device 1 can be designed to be lightweight.

[0061] In this specific example, 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 outer shell 10, and the inner edge of the first fold ring 111 is connected to the first vibration plate 112, and 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 bent and extended to the first diaphragm 11 and connected to the first vibration plate 112.

[0062] In the sound-generating device 1 provided in the embodiment of the present application, the first diaphragm 11 includes a first folded ring 111 made of a flexible material and a first vibration plate 112 made of a rigid material, and the first folded ring 111 and the first vibration plate 112 are connected to each other. The second diaphragm 12 includes a second folded ring 121 made of a flexible material and a second vibration plate 122 made of a rigid material, and the second folded ring 121 and the second vibration plate 122 are connected to each other. And 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.

[0063] Alternatively, the first vibration plate 112 and the second vibration plate 122 may be made of magnesium-aluminum alloy, magnesium-lithium alloy, or the like.

[0064] Reference Figure 1a to Figure 1c As shown, in one embodiment, the inner side of the second vibration plate 122 includes an inclined portion 1220 disposed at a predetermined angle with the vibration direction.

[0065] In this specific example, the inner side of the second vibration plate 122 includes an inclined portion 1220, which 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, thereby improving the connection accuracy.

[0066] Reference Figure 1a to Figure 1c As shown, in one embodiment, the predetermined angle is 5° to 85°, and can be 5°, 15°, 25°, 35°, 45°, 55°, 65°, 75°, 85°, etc.

[0067] Reference Figure 1a to Figure 1c As shown, in one embodiment, the middle diaphragm 13 includes an external connection part 131, a deformation part 132 and an internal connection part 133, the deformation part 132 is located between the external connection part 131 and the internal connection part 133, the external connection part 131 is connected to the housing 10, and the internal connection part 133 is connected to the first vibration plate 112.

[0068] 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.

[0069] 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 inner edges of the first vibration plate 112 and the second vibration plate 122 of the first diaphragm 11; or, the inner edge of the second vibration plate 122 is located between the first vibration plate 112 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 vibration plate 112 of the first diaphragm 11, that is, the inner connection portion 133 and the inner edge of the second vibration plate 122 may have no 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.

[0070] Reference Figure 1bAs shown, in one embodiment, 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, further reducing the effective vibration area of ​​the middle diaphragm 13.

[0071] In one embodiment, the second fold 121 protrudes toward the direction close to the first diaphragm 11, the deformation portion 132 protrudes toward the direction away from the first diaphragm 11, and the second fold 121 and the deformation portion 132 are staggered in the 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.

[0072] 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.

[0073] 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 first protrusion 1121, and the first protrusion 1121 is connected to the second vibration plate 122 and the middle diaphragm 13; or, the first diaphragm 11 further includes a first bracket 113, 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 vibration plate 122 and the middle diaphragm 13.

[0074] 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 .

[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] In one embodiment, 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 13; that is, the compliance of the middle diaphragm 13 is larger, and it only serves to form a closed second sound cavity Q2 with the second diaphragm 12, and 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-emitting device 1.

[0079] In one embodiment, 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.

[0080] 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.

[0081] In one embodiment, 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.

[0082] 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 .

[0083] 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.

[0084] 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.

[0085] 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 fold ring 111 and the outer edge of the middle diaphragm 13 are both 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.

[0086] 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 fold ring 111 and the outer edge of the middle diaphragm 13; and the outer edge of the second fold ring 121 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 fold ring 121.

[0087] In this embodiment, the outer edge of the middle diaphragm 13 and the outer edge of the first fold ring 111 are 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 fold ring 111 are respectively fixed to the inner and outer sides of the inner bending wall 1012. There is no limitation here, and it can be flexibly selected according to actual conditions.

[0088] In this embodiment, the first diaphragm 11 further includes a first flange 110 located outside the outer edge of the first fold ring 111 , 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 .

[0089] In this embodiment, the second diaphragm 12 also includes a second flange 120 located outside the outer edge of the second fold ring 121, 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.

[0090] 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.

[0091] Reference Figure 1a As shown, in one embodiment, the magnetic circuit system includes a yoke 18 and an inner magnetic portion 16 and a side magnetic portion 17 arranged on the yoke 18, the side magnetic portion 17 is arranged on the outside of the inner magnetic portion 16, and a magnetic gap is formed between the inner magnetic portion 16 and the side magnetic portion 17.

[0092] 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.

[0093] Further, refer to 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.

[0094] Reference Figure 1a , Figure 2 As shown, in one embodiment, the first diaphragm 11 and the middle diaphragm 13 enclose a first rear cavity H1, and the first diaphragm 11, the second diaphragm 12 and the housing 10 enclose a second rear cavity H2; the first rear cavity H1 and the second rear cavity H2 are connected. In this way, the internal airflow of the sound-generating device 1 is facilitated, the air pressure balance at different positions in the internal area of ​​the sound-generating device 1 is improved, and the vibration performance of the first diaphragm 11 and the second diaphragm 12 is improved. 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.

[0095] Furthermore, 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.

[0096] Reference Figure 1a As shown, in one embodiment, the sound-generating device further includes an elastic support member 15, the elastic support member 15 includes an outer fixing portion 151, a vibration arm 153 and an inner fixing portion 152 connected in sequence, the outer fixing portion 151 is fixed to the housing 10, the inner fixing portion 152 is fixed to the second diaphragm 12, and the inner fixing portion 152 is provided with a pad electrically connected to the voice coil 14. Further, the second diaphragm 12 includes a second folding ring 121 and a second vibration plate 122, the outer side of the second folding ring 121 is connected to the housing 10, the inner side of the second folding ring 121 is connected to the outer side of the second vibration plate 122, and the inner fixing portion 152 is fixed to the second vibration plate 122. In this specific example, 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 inner fixing portion 152 includes a main body portion and an extension portion extending toward the voice coil 14 and connected to the voice coil 14 , the main body portion is connected to the second diaphragm 12 , and a pad electrically connected to the voice coil 14 is provided on the extension portion or the main body portion.

[0098] 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.

[0099] 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.

[0100] Reference Figure 1a , Figure 1e , Figure 1g As 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.

[0101] 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.

[0102] Further, the inner magnetic portion 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 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 side 141 arranged opposite to each other, and the second protrusion is formed with a second side opposite to the first side 141, and the first side 141 and the second side are arranged in parallel. Specifically, the inner magnet 161 extends to form a first sub-protrusion 1610, and the inner magnetic conductive plate 162 extends to form a second sub-protrusion 1620. The first protrusion 140, the first sub-protrusion 1610 and the second sub-protrusion 1620 are all arranged correspondingly.

[0103] Reference Figure 1e and Figure 1h As shown, the first protrusion 140 includes a first edge 141 and a connecting edge 142. There are two first edges 141, which are arranged opposite to each other, and the connecting edge 142 is connected between the two first edges 141. Optionally, the connecting edge 142 is an arc edge.

[0104] Reference Figure 1h As shown, in one embodiment, the first sub-protrusion 1610 has two first sub-edges 1611 arranged opposite to each other, and the second sub-protrusion 1620 has two second sub-edges 1621 arranged opposite to each other, the first sub-edges 1611 and the second sub-edges 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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 first sub-protrusions 1610 formed by the extension of the inner magnet 161 are arranged at the four corners, and the second sub-protrusions 1620 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.

[0110] More specifically, refer to Figure 1h As 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.

[0111] Further, refer to Figure 1a As shown, the inner magnetic part 16 and the side magnetic part 17 are installed on the yoke 18. The yoke 18 is provided with an avoidance structure 180 for avoiding the inner fixing part 152 of the elastic support member 15, and the avoidance structure 180 can be a recessed groove or a through hole; when the avoidance structure 180 is a through hole, it also serves as a leakage hole of the sound-generating device 1, and the leakage hole connects the internal space and the external space of the sound-generating device.

[0112] 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.

[0113] Reference Figure 1a , Figure 1b As shown, in one embodiment, the sound-generating device further includes an elastic support member 15 disposed between the second housing 102 and the second diaphragm 12, the elastic support member 15 includes an outer fixing portion 151, a vibration arm 153 and an inner fixing portion 152 connected in sequence, the outer fixing portion 151 is sandwiched between the outer edge of the second diaphragm 12 and the second housing 102, and the inner fixing portion 152 is connected to the inner edge of the second diaphragm 12. Specifically, the inner fixing portion 152 may be connected to the second vibration plate 122.

[0114] In this specific example, the elastic support member 15 is connected to 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.

[0115] According to another embodiment of the present application, referring to Figure 2 As shown, a sound module is provided, which includes the sound device 1 as above; and also includes a module shell 2, a first sound cavity Q1 is formed between the module shell 2 and the first diaphragm 11, the module shell 2 has a sound outlet 20, and the first sound cavity Q1 is connected to the sound outlet 20.

[0116] The sound module provided in the embodiment of the present application includes the above-mentioned sound device 1, and compared with the conventional sound module, the acoustic performance is improved under the same size conditions. In the sound module, the first sound cavity Q1 is connected to the sound outlet 20, and the second sound cavity Q2 can also be connected to the sound outlet 20. Specifically, the sound module has an air flow channel connecting the first sound outlet 100 and the sound outlet 20, and the second sound cavity Q2 is connected to the sound outlet 20 via the first sound outlet 100 and the air flow channel. Or, as Figure 2As shown, the first sound outlet 100 and the sound outlet 20 are directly opposite and connected.

[0117] According to another embodiment of the present application, referring to Figure 3 and Figure 4 As shown, an electronic device is provided, and the electronic device includes the above sound module.

[0118] The electronic device provided in the embodiment of the present application includes the above-mentioned sound module, and it can have better acoustic performance under the premise of the same size as conventional electronic devices. The electronic device 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 electronic device housing 3 is also provided with an electronic device sound outlet 31, and the electronic device sound outlet 31 is connected to the sound outlet 20 of the sound module. The sound module has a rear sound outlet channel 21, and the rear sound outlet channel 21 is connected to the electronic device cavity 30; the effective volume of the electronic device cavity is ≥2.5cc. In the electronic device of the embodiment of the present application, the electronic device cavity 30 of the electronic device is connected with the internal space of the sound module, and the electronic device cavity 30 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 effective vibration area is increased. The air in the rear cavity is compressed during the vibration process, so that the large amplitude vibration of the vibration system can be achieved, and the sound quality of the sound module can be improved; 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.

[0119] In one embodiment, if Figure 4 As 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. 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. 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.

[0120] 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.

[0121] 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-generating device, characterized in that: The sound-generating device comprises: A housing, wherein the housing has a containing space and is provided with a first sound outlet; A magnetic circuit system, the magnetic circuit system is arranged in the accommodating space, and the magnetic circuit system has a magnetic gap; A vibration system, the vibration system comprising a first diaphragm, a second diaphragm, a middle diaphragm and a voice coil, the first diaphragm being arranged on a side of the housing away from the magnetic circuit system, the second diaphragm being arranged on a side of the first diaphragm facing the magnetic circuit system, the middle diaphragm being arranged between the first diaphragm and the second diaphragm, and the middle diaphragm being a flexible member; The voice coil is at least partially disposed 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; wherein, 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 outer shell, and the inner edge of the first folding ring is connected to the first vibration plate; the second diaphragm includes a second folding ring and a second vibration plate, the outer side of the second folding ring is connected to the outer shell, the inner side of the second folding 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 vibration plate.

2. The sound generating device according to claim 1, characterized in that: The inner side of the second vibration plate includes an inclined portion arranged at a predetermined angle with the vibration direction.

3. The sound-generating device according to claim 2, characterized in that: The predetermined angle is 5° to 85°.

4. The sound generating device according to claim 1, characterized in that: The middle diaphragm includes an outer connection part, a deformation part and an inner connection part, the deformation part is located between the outer connection part and the inner connection part, the outer connection part is connected to the outer shell, and the inner connection part is connected to the first vibration plate.

5. The sound generating device according to claim 4, characterized in that: The inner connecting portion is arranged closer to the first diaphragm than the outer connecting portion; or, the inner connecting portion is located between the inner edges of the first vibration plate and the second vibration plate; or, the inner edge of the second vibration plate is located between the first vibration plate and the inner connecting portion; or, the inner connecting portion and the inner edge of the second vibration plate are respectively connected to the first vibration plate.

6. The sound generating device according to claim 4, characterized in that: The first folding 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 second fold ring protrudes in a direction approaching 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.

7. The sound generating device according to claim 1, characterized in that: The first vibration plate is provided with a first protrusion, and the first protrusion is connected to the second vibration plate and the middle diaphragm; Alternatively, the first diaphragm further includes a first bracket, 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 vibration plate and the middle diaphragm.

8. The sound generating device according to claim 1, characterized in that: The first vibration plate is provided with a second protrusion, and the second protrusion is connected to the voice coil; Alternatively, the first diaphragm further includes a second bracket, one end of the second bracket is connected to the first vibration plate, and the other end of the second bracket is connected to the voice coil.

9. The sound generating device according to claim 1, characterized in that: The compliance of the second fold ring and the compliance of the first fold ring are both smaller than the compliance of the middle diaphragm; And / or, the effective vibration area of ​​the middle diaphragm is smaller than the effective vibration area of ​​the second diaphragm.

10. The sound generating device 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 fold ring is fixed to the first shell, the outer edge of the second fold ring is clamped between the first shell and the second shell, and the first sound outlet is provided in the first shell.

11. The sound generating device according to claim 10, characterized in that: The first shell includes a first side wall and an inner bending wall bent from the first side wall into the accommodating space, and the outer edge of the first folding ring and the outer edge of the middle diaphragm are fixed to the inner bending wall.

12. The sound generating device according to claim 11, characterized in that: The outer edge of the first fold ring and the outer edge of the middle diaphragm are both fixed to the outside of the inner bending wall or are respectively fixed to the opposite sides of the inner bending wall; And / or, the first diaphragm further comprises a first flange located outside the outer edge of the first fold, and the first flange is connected to the first side wall; And / or, the second diaphragm further includes a second flange located outside the outer edge of the second fold ring, and the second flange is connected to the first side wall or the second shell.

13. The sound generating device according to claim 1, characterized in that: The magnetic circuit system includes a yoke, and an inner magnetic part and an edge magnetic part arranged on the yoke. The edge magnetic part is arranged outside the inner magnetic part, and the magnetic gap is formed between the inner magnetic part and the edge magnetic part.

14. A sound module, comprising the sound device as described in any one of claims 1 to 13; and also comprising a module shell, wherein a first sound cavity is formed between the module shell and the first diaphragm, the module shell has a sound outlet, and the first sound cavity is connected to the sound outlet.

Images