Sound production device and sound production module

Abstract

The utility model 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, the shell is provided with a first sound outlet hole, and the shell comprises a first shell and a second shell; the magnetic circuit system is fixed on the second shell and is provided with 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 one side, far away from the magnetic circuit system, of the shell, and the outer edge of the first vibrating diaphragm is fixed on the first shell; the second vibrating diaphragm is arranged on one side, facing the magnetic circuit system, of the first vibrating diaphragm, and the outer edge of the second vibrating diaphragm is clamped between the first shell and the second shell; the middle diaphragm is arranged between the first vibrating diaphragm and the second vibrating diaphragm, and the outer edge of the middle diaphragm is connected with the first shell; the voice coil is at least partially arranged in the magnetic gap; the inner edges of the second vibrating diaphragm and the middle diaphragm are connected with the first vibrating diaphragm; and a closed second sound production cavity is formed between the second vibrating diaphragm and the middle diaphragm and is communicated with the first sound outlet hole.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic products, and more particularly, to a sound generating device and a sound generating module. BACKGROUND

[0002] With the rapid development of the consumer electronics industry, consumers' requirements for electronic products are constantly improving; in addition to the performance of the product itself, portability and comfort are among the aspects that consumers focus on. The conventional loudspeaker is difficult to meet the design requirements of high performance and thinness at the same time.

[0003] Therefore, there is a need to provide a new technical solution to solve the above technical problems. CONTENT OF THE UTILITY MODEL

[0004] An object of the present application is to provide a new technical solution for a sound generating device and a sound generating module.

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

[0006] a housing having a containing space, the housing being provided with a first sound outlet hole, the housing comprising a first shell and a second shell, the first shell and the second shell enclosing the containing space;

[0007] a magnetic circuit system arranged in the containing space, the magnetic circuit system being fixed to the second shell, the magnetic circuit system having a magnetic gap;

[0008] a vibration system comprising a first diaphragm, a second diaphragm, an intermediate partition membrane and a voice coil, the first diaphragm being arranged on a side of the housing away from the magnetic circuit system, an outer edge of the first diaphragm being fixed to the first shell; the second diaphragm being arranged on a side of the first diaphragm facing the magnetic circuit system, an outer edge of the second diaphragm being clamped between the first shell and the second shell; the intermediate partition membrane being arranged between the first diaphragm and the second diaphragm, an outer edge of the intermediate partition membrane being connected to the first shell;

[0009] the voice coil being at least partially arranged in the magnetic gap, and the voice coil being connected to the first diaphragm, the second diaphragm and the intermediate partition membrane being located on an outer side of the voice coil;

[0010] inner edges of the second diaphragm and the intermediate partition membrane are connected to the first diaphragm; a closed second sound generating cavity is formed between the second diaphragm and the intermediate partition membrane, the second sound generating cavity being in communication with the first sound outlet hole.

[0011] Optionally, the first shell comprises a first side wall and an inner bending wall bent inwardly from the first side wall into the accommodating space, and the outer edge of the first diaphragm and the outer edge of the intermediate diaphragm are fixed to the inner bending wall.

[0012] Optionally, the outer edge of the first diaphragm and the outer edge of the intermediate diaphragm are both fixed to the outer side of the inner bending wall, and the outer edge of the intermediate diaphragm is located between the outer edge of the first diaphragm and the inner bending wall; or the outer edge of the first diaphragm and the outer edge of the intermediate diaphragm are respectively fixed to opposite sides of the inner bending wall.

[0013] And / or, the first sound hole is arranged on the first side wall or the inner bending wall.

[0014] Optionally, the first diaphragm further comprises a first flange located outside the outer edge of the first diaphragm, and the first flange is connected to the first side wall.

[0015] And / or, the second diaphragm further comprises a second flange located outside the outer edge of the second diaphragm, and the second flange is connected to the first side wall or the second shell.

[0016] Optionally, the magnetic circuit system comprises a magnetic yoke, an inner magnetic part and an edge magnetic part arranged on the magnetic yoke, the edge magnetic part is located outside the inner magnetic part, the magnetic gap is formed between the inner magnetic part and the edge magnetic part, and the magnetic yoke is fixed to the second shell.

[0017] Optionally, the first shell is made of metal, the magnetic yoke is welded to the first shell, at least one of the magnetic yoke and the first shell has a welding protrusion extending to the other, or the magnetic yoke and the first shell are welded by a welding sheet.

[0018] And / or, the second shell is made of metal, the magnetic yoke is welded to the second shell, at least one of the magnetic yoke and the second shell has a welding protrusion extending to the other, or the magnetic yoke and the second shell are welded by a welding sheet.

[0019] Optionally, the second diaphragm comprises a second folded ring and a second vibrating plate, the outer edge of the second folded ring is arranged between the first shell and the second shell, the inner side of the second folded ring is connected to the outer side of the second vibrating plate, and the inner side of the second vibrating plate is integrally bent and extended to the first diaphragm and connected to the first diaphragm.

[0020] Optionally, the inner side of the second vibrating plate comprises an inclined part arranged at a predetermined angle with the vibration direction.

[0021] And / or, the intermediate diaphragm is a flexible piece, and an effective vibration area of the intermediate diaphragm is smaller than an effective vibration area of the second diaphragm.

[0022] Optionally, the first diaphragm comprises a first folded ring and a first vibration plate, an outer edge of the first folded ring is connected with the first shell, an inner edge of the first folded ring is connected with the first vibration plate, the intermediate diaphragm comprises a deformation part, the first folded ring is convex towards a direction away from the second diaphragm, and the deformation part is convex towards a direction close to the second diaphragm.

[0023] And / or, the intermediate diaphragm comprises a deformation part, the second folded ring is convex towards a direction close to the first diaphragm, the deformation part is convex towards a direction away from the first diaphragm, and the second folded ring and the deformation part are arranged in a horizontal direction in a staggered manner.

[0024] Optionally, the sound generating device further comprises an elastic support arranged between the second shell and the second diaphragm, the elastic support comprises an outer fixed part, a vibration arm and an inner fixed part connected in sequence, the outer fixed part is arranged between an outer edge of the second diaphragm and the second shell, the inner fixed part is fixed to the second vibration plate, and the inner fixed part is provided with a solder pad electrically connected with the voice coil.

[0025] According to a second aspect of the present application, a sound generating module is provided, comprising the sound generating device according to the first aspect; and further comprising a module shell, a first sound generating cavity is formed between the module shell and the first diaphragm, the module shell is provided with a sound outlet, and the first sound generating cavity is communicated with the sound outlet.

[0026] In the sound generating device provided in the embodiments of the present application, in addition to the first diaphragm, the second diaphragm and the intermediate diaphragm also vibrate at the same time as the voice coil vibrates, so that the effective vibration area of the vibration system is increased, and the acoustic performance of the sound generating device is improved. In addition, in the sound generating device provided in the embodiments of the present application, the shell comprises a first shell and a second shell, an outer edge of the first diaphragm is fixed to the first shell, and an outer edge of the second diaphragm is arranged between the first shell and the second shell; such a setting mode helps to simplify the assembly process of the sound generating device, improve the production efficiency, and improve the connection reliability of the first diaphragm and the second diaphragm.

[0027] Other characteristics and advantages of the present application will become apparent from the following detailed description of exemplary embodiments thereof, with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0028] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application.

[0029] Figure 1a Fig. 1 shows an exploded structural schematic diagram of a sound generating device according to an embodiment of the present application;

[0030] Figure 1b Fig. 2 shows a cross-sectional structural schematic diagram of a sound generating device according to an embodiment of the present application;

[0031] Figure 1c Fig. 3 shows a cross-sectional structural schematic diagram of a sound generating device according to an embodiment of the present application; Figure 2

[0032] Figure 1d Fig. 4 shows a cross-sectional structural schematic diagram of a sound generating device according to an embodiment of the present application; Figure 3

[0033] Figure 1e Fig. 5 shows a structural schematic diagram of a voice coil in a sound generating device according to an embodiment of the present application;

[0034] Figure 1f Fig. 6 shows a structural schematic diagram of an elastic support in a sound generating device according to an embodiment of the present application;

[0035] Figure 1g Fig. 7 shows a partial structural schematic diagram of a sound generating device according to an embodiment of the present application;

[0036] Figure 1h Fig. 8 shows a partial exploded structural schematic diagram of a sound generating device according to an embodiment of the present application;

[0037] Figure 1i Fig. 9 shows a whole structural schematic diagram of a sound generating device according to an embodiment of the present application;

[0038] Figure 1j Fig. 10 shows a whole structural schematic diagram of a sound generating device according to an embodiment of the present application; Figure 2

[0039] Fig. 11 shows a structural schematic diagram of a sound generating module according to an embodiment of the present application; Figure 2

[0040] Fig. 12 shows a structural schematic diagram of an electronic device according to an embodiment of the present application; Figure 3

[0041] Fig. 13 shows a structural schematic diagram of an electronic device according to an embodiment of the present application; Figure 4 Legend of reference signs:

[0042]

[0043] ​​​1, sound production device; 10, housing; 101, first shell; 1011, first side wall; 1012, inner bent wall; 102, second shell; 100, first sound hole; 11, first diaphragm; 111, first folded ring; 110, first flange; 112, first vibrating plate; 1121, first protruding part; 1122, second protruding part; 113, first support; 114, second support; 12, second diaphragm; 121, second folded ring; 120, second flange; 122, second vibrating plate; 1220, inclined part; 13, intermediate spacer; 131, outer connecting part; 132, deformation part; 133, inner connecting part; 14, voice coil; 140, first protruding part; 141, first side; 142, connecting side; 15, elastic support; 151, outer fixed part; 152, inner fixed part; 153, vibrating arm; 150, conductive part; 16, inner magnetic part; 161, inner magnet; 1610, first sub-protruding part; 1611, first sub-side; 162, inner magnetic conducting plate; 1620, second sub-protruding part; 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 conducting plate; 1720, fourth sub-side; 1721, first side magnetic conducting plate; 1722, second side magnetic conducting plate; 18, magnetic yoke; 180, avoiding structure; 19, welding protrusion;

[0044] 2, module housing; 20, sound outlet; 21, rear sound outlet channel; 22, rear sound cavity; 3, electronic device housing; 30, electronic device cavity; 31, electronic device sound hole. DETAILED DESCRIPTION

[0045] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments are not limiting to the scope of the present application unless specifically stated otherwise.

[0046] The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application or its application or uses.

[0047] Techniques, methods, and devices known to those of ordinary skill in the relevant art can not be discussed in detail herein, but should be considered as part of the specification, where appropriate.

[0048] In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary, and not as a limitation. Thus, other examples of the exemplary embodiments can have different values.

[0049] It should be noted that like numerals and letters refer to like items throughout the several views, as such, once an item is defined in one view, it need not be discussed further in subsequent views.

[0050] Referring to Figures 1a-2 According to one embodiment of the present application, a sound generating device 1 is provided, which comprises a housing 10, a magnetic circuit system and a vibration system, the housing 10 has a containing space, the housing 10 is provided with a first sound hole 100, the housing 10 comprises a first shell 101 and a second shell 102, the first shell 101 and the second shell 102 enclose the containing space;

[0051] The magnetic circuit system is arranged in the containing space, and the magnetic circuit system is fixed to the second shell 102, and the magnetic circuit system has a magnetic gap;

[0052] The vibration system comprises a first diaphragm 11, a second diaphragm 12, an intermediate partition membrane 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, and an outer edge of the first diaphragm 11 is fixed to the first shell 101; the second diaphragm 12 is arranged on a side of the first diaphragm 11 facing the magnetic circuit system, and an outer edge of the second diaphragm 12 is clamped between the first shell 101 and the second shell 102; the intermediate partition membrane 13 is arranged between the first diaphragm 11 and the second diaphragm 12, and an outer edge of the intermediate partition membrane 13 is connected with the first shell 101;

[0053] The voice coil 14 is at least partially arranged in the magnetic gap, and the voice coil 14 is connected with the first diaphragm 11, and the second diaphragm 12 and the intermediate partition membrane 13 are located outside the voice coil 14;

[0054] Inner edges of the second diaphragm 12 and the intermediate partition membrane 13 are both connected with the first diaphragm 11; a closed second sound generating cavity Q2 is formed between the second diaphragm 12 and the intermediate partition membrane 13, and the second sound generating cavity Q2 is in communication with the first sound hole 100.

[0055] In the sound generating device 1 provided by 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 audio current passes through the voice coil 14, the voice coil 14 is vibrated in the magnetic field due to the action of the Ampere force, thereby driving the first diaphragm 11 to vibrate and generate sound; and since the second diaphragm 12 and the intermediate partition membrane 13 are both connected with the first diaphragm 11, the first diaphragm 11 will also drive the second diaphragm 12 and the intermediate partition membrane 13 to vibrate together and in the same direction when vibrating; the closed second sound generating cavity Q2 is formed between the second diaphragm 12 and the intermediate partition membrane 13, and the vibration of the first diaphragm 11, the second diaphragm 12 and the intermediate partition membrane 13 will push the sound wave of the second sound generating cavity Q2 to radiate outward through the first sound hole 100, thereby realizing the vibration sound generation of the sound generating device.

[0056] In the sound production device 1 provided in the embodiments of the present application, the second diaphragm 12 and the intermediate partition membrane 13 are added on the basis of the traditional first diaphragm 11 vibrating to produce sound, the second diaphragm 12 and the intermediate partition membrane 13 enclose a closed second sound production cavity Q2, and the sound waves of the second sound production cavity Q2 are radiated outward through the first sound hole 100, thereby increasing the effective vibration area of the vibration system and further improving the FR (frequency response) of the sound production device and the acoustic performance of the sound production device. That is, the sound production device 1 provided in the embodiments of the present application increases the effective vibration area of the vibration system, and in the same amplitude condition, the acoustic performance of the sound production device 1 is improved without increasing the size of the sound production device compared with the conventional sound production device. In other words, if the sound production device 1 provided in the embodiments of the present application maintains the same acoustic performance as the conventional sound production device, the amplitude of the vibration system can be reduced, thereby realizing the lightweight design of the sound production device 1.

[0057] In addition, the shell 10 includes a first shell 101 and a second shell 102, the outer edge of the first diaphragm 11 is fixed to the first shell 101, and the outer edge of the second diaphragm 12 is clamped between the first shell 101 and the second shell 102; such a setting mode helps to simplify the assembly process of the sound production device, improve production efficiency, and improve the connection reliability of the first diaphragm 11 and the second diaphragm 12. Moreover, the outer edge of the second diaphragm 12 is clamped between the first shell 101 and the second shell 102, so that the height of the shell 10 can be adjusted accordingly according to the amplitude requirement of the sound production device 1 to increase or decrease the vibration space between the intermediate partition membrane 13 and the second diaphragm 12, thereby adapting to the needs of different products.

[0058] Referring to Figure 1b In one embodiment, the first shell 101 includes a first side wall 1011 and an inner bent wall 1012, the inner bent wall 1012 is bent and extended into the accommodation space from the first side wall 1011, and the outer edge of the first diaphragm 11 and the outer edge of the intermediate partition membrane 13 are both fixed to the inner bent wall 1012.

[0059] In this specific example, the first shell 101 further includes a first side wall 1011 and an inner bent wall 1012, the inner bent wall 1012 provides effective support and connection for the outer edge of the first diaphragm 11 and the outer edge of the intermediate partition membrane 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.

[0060] Referring to Figure 1bAs shown, in one embodiment, the outer edge of the first diaphragm 11 and the outer edge of the middle partition membrane 13 are both fixed to the outer side of the inner bending wall 1012, and the outer edge of the middle partition membrane 13 is located between the outer edge of the first diaphragm 11 and the inner bending wall 1012; or the outer edge of the first diaphragm 11 and the outer edge of the middle partition membrane 13 are respectively fixed to the opposite sides of the inner bending wall 1012; in this embodiment, the outer edge of the middle partition membrane 13 and the outer edge of the first diaphragm 11 are both fixed to the outer side of the inner bending wall 1012, and the outer edge of the middle partition membrane 13 is sandwiched between the outer edge of the first diaphragm 11 and the inner bending wall 1012; or the outer edge of the middle partition membrane 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, for example, the outer edge of the first diaphragm 11 is fixed to the outer side of the inner bending wall 1012, and the outer edge of the middle partition membrane 13 is fixed to the inner side of the inner bending wall 1012. This is not limited, and can be flexibly selected according to actual conditions.

[0061] In one embodiment, the first sound hole 100 is arranged on the first side wall 1011 or the inner bending wall 1012. When the first sound hole 100 is arranged on the inner bending wall 1012, the first sound hole 100 is located on the outer side of the outer edge of the first diaphragm 11 and the outer edge of the middle partition membrane 13, thereby ensuring that the first sound hole 100 communicates with the second sound cavity Q2.

[0062] Referring to Figure 1c As shown, in one embodiment, the first diaphragm 11 further includes a first flange 110 located on the outer side of the outer edge of the first diaphragm 11, and the first flange 110 is connected with the first side wall 1011; in this way, the connection stability of the first diaphragm 11 and the waterproof effect of the sound production device 1 can be improved.

[0063] In one embodiment, the second diaphragm 12 further includes a second flange 120 located on the outer side of the outer edge of the second diaphragm 12, and the second flange 120 is connected with the first side wall 1011 or the second shell 102; in this way, the connection stability of the second diaphragm 12 and the waterproof effect of the sound production device 1 can be improved.

[0064] Referring to Figure 1a As shown, in one embodiment, the magnetic circuit system includes a magnetic yoke 18, an inner magnetic part 16 and a side magnetic part 17 arranged on the magnetic yoke 18, the side magnetic part 17 is located on the outer side of the inner magnetic part 16, a magnetic gap is formed between the inner magnetic part 16 and the side magnetic part 17, and the magnetic yoke 18 is fixed to the second shell 102.

[0065] 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 both of them are used to generate a magnetic field. The inner magnetic part 16 and the side magnetic part 17 are both mounted on the magnetic yoke 18, which 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. Moreover, the magnetic yoke 18 is mounted on the second shell 102.

[0066] Referring to Figure 1i and Figure 1j In one embodiment, the first shell 101 is made of metal, and the magnetic yoke 18 is welded to the first shell 101. At least one of the magnetic yoke 18 and the first shell 101 has a welding protrusion 19 extending to the other. Alternatively, the magnetic yoke 18 and the first shell 101 are welded by a welding sheet.

[0067] For example, the first shell 101 is provided with a welding protrusion 19 extending towards the magnetic yoke 18, and the first shell 101 and the magnetic yoke 18 are welded by the welding protrusion 19. For example, the magnetic yoke 18 is provided with a welding protrusion 19 extending towards the first shell 101, and the magnetic yoke 18 and the first shell 101 are welded by the welding protrusion 19. For example, the magnetic yoke 18 and the first shell 101 are welded by a welding sheet, and a part of the welding sheet is welded to the magnetic yoke 18 and the other part is welded to the first shell 101.

[0068] In one embodiment, the second shell 102 is made of metal, and the magnetic yoke 18 is welded to the second shell 102. At least one of the magnetic yoke 18 and the second shell 102 has a welding protrusion 19 extending to the other. Alternatively, the magnetic yoke 18 and the second shell 102 are welded by a welding sheet.

[0069] For example, the second shell 102 is provided with a welding protrusion 19 extending towards the magnetic yoke 18, and the second shell 102 and the magnetic yoke 18 are welded by the welding protrusion 19. For example, the magnetic yoke 18 is provided with a welding protrusion 19 extending towards the second shell 102, and the magnetic yoke 18 and the second shell 102 are welded by the welding protrusion 19. For example, the magnetic yoke 18 and the second shell 102 are welded by a welding sheet, and a part of the welding sheet is welded to the magnetic yoke 18 and the other part is welded to the second shell 102.

[0070] It can be understood that when the magnetic yoke 18 is welded to the first shell 101, the first shell 101 or the magnetic yoke 18 has the welding protrusion 19; when the magnetic yoke 18 is welded to the second shell 102, the second shell 102 or the magnetic yoke 18 has the welding protrusion 19.

[0071] In the embodiment, the first shell 101 is made of metal, so as to further increase the accommodating space of the sound production device 1 and improve the heat dissipation performance of the sound production device 1. The second shell 102 is made of metal, so as to further increase the accommodating space of the sound production device 1 and improve the heat dissipation performance of the sound production device 1. The magnetic yoke 18 is welded to the first shell 101 or the second shell 102, so as to improve the connection stability of the magnetic circuit system and the shell 10.

[0072] Referring to Figures 1a-1cAs shown, in one embodiment, the second diaphragm 12 comprises a second folded ring 121 and a second vibrating plate 122, the outer edge of the second folded ring 121 is clamped between the first shell 101 and the second shell 102, the inner side of the second folded ring 121 is connected with the outer side of the second vibrating plate 122, and the inner side of the second vibrating plate 122 is integrally bent and extended to the first diaphragm 11 and connected with the first diaphragm 11.

[0073] In this specific example, the second diaphragm 12 comprises a second folded ring 121 made of flexible material and a second vibrating plate 122 made of rigid material, and the second folded ring 121 and the second vibrating plate 122 are connected with each other. The second vibrating plate 122 simultaneously serves as a skeleton for connecting the first diaphragm 11 and the intermediate diaphragm 13, facilitating the integration of the parts of the sound production device 1 and saving the internal volume of the sound production device 1. In this embodiment, the second vibrating plate 122 can be a magnesium-aluminum alloy, a magnesium-lithium alloy, etc. In addition, the outer edge of the second folded ring 121 is clamped between the first shell 101 and the second shell 102, which can stably connect the second diaphragm 12.

[0074] Referring to Figures 1a-1c As shown, in one embodiment, the inner side of the second vibrating plate 122 comprises an inclined portion 1220 arranged at a predetermined angle with the vibration direction; the arrangement of the inclined portion 1220 can improve the rigidity of the second vibrating 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 the feasibility of molding. At the same time, the inclined portion 1220 is farther away from the magnetic circuit system relative to the inner edge of the second vibrating plate 122, which can make the outer edge of the magnetic circuit system outwardly inclined and expanded, thereby increasing the size of the magnetic circuit system and further improving the BL of the sound production device; and the inclined portion 1220 is more convenient for positioning and connecting the second vibrating plate 122 and the second folded ring 121, thereby improving the connection precision.

[0075] In one embodiment, the intermediate diaphragm 13 is a flexible member, and the effective vibration area of the intermediate diaphragm 13 is smaller than the effective vibration area of the second diaphragm 12.

[0076] In this specific example, since the intermediate diaphragm 13 plays a negative role in pushing the air volume when the sound production device 1 is working, and the second diaphragm 12 plays a positive role in pushing the air volume, by using the effective vibration area of the intermediate diaphragm 13 being smaller than the effective vibration area of the second diaphragm 12, the positive phase sound wave of the second sound production cavity Q2 can be increased, the volume of the air pushed when the sound production device 1 is working can be increased, and thus the sound production quality can be improved. It should be noted that the intermediate diaphragm 13 is a flexible member, and the second diaphragm 12 comprises a second folded ring 121 and a second vibrating plate 122. For example, the ratio of the effective vibration area of the intermediate diaphragm 13 to the effective vibration area of the second diaphragm 12 is 1:1.5~1:3.

[0077] Referring to Figure 1b As shown in the figure, in one embodiment, the first diaphragm 11 comprises a first folded ring 111 and a first vibrating plate 112, the outer edge of the first folded ring 111 is connected with the first shell 101, the inner edge of the first folded ring 111 is connected with the first vibrating plate 112, the intermediate diaphragm 13 comprises a deformation part 132, the first folded ring 111 protrudes towards the direction away from the second diaphragm 12, and the deformation part 132 protrudes towards the direction close to the second diaphragm 12; in this way, the intermediate diaphragm 13 and the first diaphragm 11 do not interfere with each other in the process of vibration, and the intermediate diaphragm 13 is conveniently arranged to be closer to the accommodating space, further reducing the effective vibration area of the intermediate diaphragm 13.

[0078] In one embodiment, the intermediate diaphragm 13 comprises a deformation part 132, the second folded ring 121 protrudes towards the direction close to the first diaphragm 11, and the deformation part 132 protrudes towards the direction away from the first diaphragm 11, the second folded ring 121 and the deformation part 132 are arranged in a staggered manner in the horizontal direction, which is perpendicular to the vibration direction. In this way, the vibration space of the intermediate diaphragm 13 and the second diaphragm 12 is ensured, so that the intermediate diaphragm 13 and the second diaphragm 12 do not interfere with each other in the process of vibration.

[0079] In the above embodiment, when the first diaphragm 11, the second diaphragm 12 and the deformation part 132 of the intermediate diaphragm 13 vibrate together, they do not interfere with each other, thereby ensuring that the sound generating device 1 has excellent sound quality.

[0080] Referring to Figures 1a-1c As shown in the figure, in one embodiment, the intermediate diaphragm 13 is a flexible member, the intermediate diaphragm 13 comprises an outer connecting part 131, a deformation part 132 and an inner connecting part 133, the outer connecting part 131 is connected with the outer shell 10, the deformation part 132 is located between the outer connecting part 131 and the inner connecting part 133, and the inner connecting part 133 is connected with the second diaphragm 12 or the first diaphragm 11.

[0081] In this specific example, the intermediate diaphragm 13 is made of a flexible material as a whole, and its outer connecting part 131 is connected with the outer shell 10 to form a fixed end, which has a smaller effective vibration area for providing anti-phase sound waves and has less impact on the performance of the vibration system, and the intermediate diaphragm 13 has the function of isolation and sealing. Alternatively, the intermediate diaphragm is a single-layer PEEK (polyether ether ketone) film, a composite PEEK (polyether ether ketone) film, etc.

[0082] In the embodiment, the inner connecting portion 133 is arranged closer to the first diaphragm 11 than the outer connecting portion 131, so that the volume of the second sound cavity Q2 can be increased, and the acoustic performance of the sound production device 1 can be improved. Alternatively, the inner connecting portion 133 is located between the first diaphragm 11 and the inner edge of the second vibrating plate 122; or the inner edge of the second vibrating plate 122 is located between the first diaphragm 11 and the inner connecting portion 133; so that the connection stability of the three can be improved. Alternatively, the inner connecting portion 133 and the inner edge of the second vibrating plate 122 are connected with the first diaphragm 11 respectively, that is, the inner connecting portion 133 and the inner edge of the second vibrating plate 122 can have no connection relationship, and both are connected with the first diaphragm 11. Various connection modes can be flexibly selected according to actual application, and the utility model does not make any limitation here.

[0083] Referring to Figures 1b-1d As shown in the figure, in one embodiment, the first diaphragm 11 comprises a first folded ring 111 and a first vibrating plate 112, the outer edge of the first folded ring 111 is connected with the shell 10, and the inner edge of the first folded ring 111 is connected with the first vibrating plate 112. Optionally, the first vibrating plate 112 is provided with a first protruding portion 1121, and the first protruding portion 1121 is connected with the second vibrating plate 122 and the intermediate diaphragm 13; or the first diaphragm 11 further comprises a first support 113, one end of the first support 113 is connected with the first vibrating plate 112, and the other end of the first support 113 is connected with the second vibrating plate 122 and the intermediate diaphragm 13.

[0084] In this specific example, the first diaphragm 11 can have two structural forms: in the first structural form, the first diaphragm 11 comprises a first folded ring 111 and a first vibrating plate 112, the first vibrating plate 112 is integrally formed with a first protruding portion 1121, and the first diaphragm 11 is connected with the second diaphragm 12 and the intermediate diaphragm 13 through the first protruding portion 1121, so that the first protruding portion 1121 can be used as a connecting framework to save the setting of parts, reduce the assembly process of the sound production device 1, and save the production cost. In the second structural form, the first diaphragm 11 further comprises a first support 113, and the first vibrating plate 112 is connected with the second diaphragm 12 and the intermediate diaphragm 13 through the first support 113, so that the connection position of the second diaphragm 12 and the intermediate diaphragm 13 with the first diaphragm 11 can be flexibly adjusted by adjusting the height of the first support 113. Both of the two structural forms of the first diaphragm 11 can ensure the effective connection between the first diaphragm 11 and the second diaphragm 12 and the intermediate diaphragm 13, so as to ensure the integrity of the vibration system of the sound production device 1.

[0085] Referring to Figures 1b-1dAs shown, in one embodiment, the first vibrating diaphragm 11 comprises a first folded ring 111 and a first vibrating plate 112, the outer edge of the first folded ring 111 is connected with the housing 10, and the inner edge of the first folded ring 111 is connected with the first vibrating plate 112. Optionally, the first vibrating plate 112 is provided with a second protruding portion 1122, and the second protruding portion 1122 is connected with the voice coil 14; or, the first vibrating diaphragm 11 further comprises a second support 114, one end of the second support 114 is connected with the first vibrating plate 112, and the other end of the second support 114 is connected with the voice coil 14.

[0086] In this specific example, the first vibrating diaphragm 11 can form a connection with the voice coil 14 through two structural forms: in the first structural form, the first vibrating diaphragm 11 comprises the first folded ring 111 and the first vibrating plate 112, the first vibrating plate 112 is integrally formed with the second protruding portion 1122, and the first vibrating diaphragm 11 forms a connection with the voice coil 14 through the second protruding portion 1122. In this way, using the second protruding portion 1122 as a connecting framework can save the setting of parts, reduce the assembly process of the sound generating device 1, and save production manufacturing costs. In the second structural form, the first vibrating diaphragm 11 further comprises the second support 114, and the first vibrating plate 112 forms a connection with the voice coil 14 through the second support 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 support 114. Both of the two structural forms of the first vibrating diaphragm 11 can ensure the effective connection between the first vibrating diaphragm 11 and the voice coil 14, thereby ensuring that the voice coil 14 can effectively drive the first vibrating diaphragm 11 to vibrate and sound.

[0087] In summary, the first vibrating plate 112 can be integrally formed with the first protruding portion 1121 to connect with the second vibrating diaphragm 12, or the first vibrating plate 112 can be integrally formed with the second protruding portion 1122 to connect with the voice coil 14; or, the first vibrating plate 112 can also be connected with the second vibrating diaphragm 12 through the first support 113 or connected with the voice coil 14 through the second support 114.

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

[0089] In this specific example, the width of the deformation portion of the intermediate partition membrane 13 is greater than or equal to the width of the deformation portion of the second folded ring 121, which helps to improve the ductility of the intermediate partition membrane 13.

[0090] In one embodiment, the first diaphragm 11 comprises a first folded ring 111 and a first vibrating plate 112, the outer edge of the first folded ring 111 is connected with the housing 10, the inner edge of the first folded ring 111 is connected with the first vibrating plate 112, the compliance of the intermediate partition film 13 is greater than the compliance of the second folded ring 121 and the first folded ring 111, that is, the compliance of the second folded ring and the compliance of the first folded ring are both less than the compliance of the intermediate partition film.

[0091] In the embodiment, the compliance of the intermediate partition film 13 is relatively large, which only serves to enclose the second sound generating cavity Q2 with the second diaphragm 12, and does 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.

[0092] Referring to FIGS. 1 and 2, Figure 1a , Figure 2 In one embodiment, the first diaphragm 11 and the intermediate partition film 13 enclose a first back cavity H1 therebetween, the first diaphragm 11, the second diaphragm 12 and the housing 10 enclose a second back cavity H2 therebetween, and the first back cavity H1 and the second back cavity H2 are communicated. In this way, the circulation of the internal airflow of the sound generating device 1 is facilitated, the air pressure balance of different positions in the internal region 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 with the second diaphragm 12 and the intermediate partition film 13 through the first protruding portion 1121 of the first vibrating plate 112, a gap for communicating the first back cavity H1 and the second back cavity H2 is arranged on the first protruding portion 1121, that is, the first protruding portion 1121 is arranged at intervals on the first vibrating plate. Alternatively, when the first diaphragm 11 is connected with the second diaphragm 12 and the intermediate partition film 13 through the first support 113, a gap for communicating the first back cavity H1 and the second back cavity H2 is arranged on the first support 113.

[0093] Further, the first diaphragm 11, the second diaphragm 12, the housing 10 and the magnetic circuit system enclose the second back cavity H2 therebetween. As shown in FIGS. 1 and 2, Figures 1b-1d and Figure 2 The housing 10 has a ring structure with open 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 enclose the second back cavity H2 therebetween.

[0094] Referring to FIGS. 1 and 2, Figure 1a In one embodiment, the sound generating device 1 further comprises an elastic support 15 arranged between the second housing 102 and the second diaphragm 12, the elastic support 15 comprises an outer fixed portion 151, a vibrating arm 153 and an inner fixed portion 152 connected in sequence, the outer fixed portion 151 is clamped between the outer edge of the second diaphragm 12 and the second housing 102, the inner fixed portion 152 is fixed to the second vibrating plate 122, and the inner fixed portion 152 is provided with a solder pad electrically connected with the voice coil 14.

[0095] In this specific example, the elastic support 15 not only provides an electrical connection path between the voice coil 14 and the external circuit system; and the elastic support 15 also helps to improve the vibration stability of the vibration system and reduce the vibration deviation. Further, the inner fixing part 152 includes a body part and an extension part extending towards the voice coil 14 and connected with the voice coil 14, the body part is connected with the second diaphragm 12, and the extension part or the body part is provided with a solder pad electrically connected with the voice coil 14.

[0096] Further, referring to FIG. 1, the sound production device 1 is rectangular, and the number of the inner fixing parts 152 is four, and the four inner fixing parts 152 are respectively connected with the four corner positions of the voice coil 14. The four inner fixing parts 152 are all arranged on the inner side of the outer fixing part 151. A gap is arranged between the vibration arm 153 and the outer fixing part 151 to ensure that the vibration arm 153 can freely vibrate under the action of the voice coil 14. In addition, the outer side of the outer fixing part 151 is also connected with the conductive part 150 for providing electrical connection between the voice coil 14 and the external circuit system. It can be seen that the sound production 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 the reliability thereof is ensured when the sound production device works at a large amplitude. Figure 1f Optionally, the elastic support 15 can be a whole structure; or the elastic support 15 can include two or four discrete structures.

[0097] Referring to FIG. 1, the sound production device 1 is rectangular, and the number of the inner fixing parts 152 is four, and the four inner fixing parts 152 are respectively connected with the four corner positions of the voice coil 14. The four inner fixing parts 152 are all arranged on the inner side of the outer fixing part 151. A gap is arranged between the vibration arm 153 and the outer fixing part 151 to ensure that the vibration arm 153 can freely vibrate under the action of the voice coil 14. In addition, the outer side of the outer fixing part 151 is also connected with the conductive part 150 for providing electrical connection between the voice coil 14 and the external circuit system. It can be seen that the sound production 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 the reliability thereof is ensured when the sound production device works at a large amplitude.

[0098] Figure 1a , Figure 1e , Figure 1g As shown in FIG. 1, in one embodiment, the magnetic circuit system includes the yoke 18 and the inner magnetic part 16 and the side magnetic part 17 arranged on the yoke 18, the side magnetic part 17 is arranged on the outer side of the inner magnetic part 16, the inner magnetic part 16 and the side magnetic part 17 form a magnetic gap therebetween, the side magnetic part 17 is provided with a notch, and the voice coil 14 has a first protruding part 140 extending into the notch. Further optionally, the inner magnetic part 16 has a second protruding part, and the second protruding part is arranged corresponding to the first protruding part 140.

[0099] In this specific example, the arrangement of the first protruding part 140 on the voice coil 14 can reduce the distance between the voice coil 14 and the second diaphragm 12, and facilitate the connection and assembly of the elastic support 15 and the voice coil 14. The inner magnetic part 16 is provided with the second protruding part, and the second protruding part is arranged corresponding to the first protruding part 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, so that the BL of the sound production device 1 is increased, thereby improving the overall acoustic performance thereof.

[0100] ​Further, the inner magnetic part 16 includes inner magnets 161 and inner magnetic conductive plates 162 which are matched in shape and size, the inner magnets 161 are clamped between the inner magnetic conductive plates 162 and the magnetic yoke 18, and the second protruding part includes protruding parts formed by the inner magnets 161 and protruding parts formed by the inner magnetic conductive plates 162. In addition, the first protruding part 140 includes first edges 141 which are oppositely arranged, the second protruding part is formed with second edges which are opposite to the first edges 141, and the first edges 141 and the second edges are arranged in parallel. Specifically, the inner magnets 161 extend to form first sub-protruding parts 1610, the inner magnetic conductive plates 162 extend to form second sub-protruding parts 1620, and the first protruding part 140, the first sub-protruding parts 1610 and the second sub-protruding parts 1620 are arranged correspondingly.

[0101] Referring to Figure 1e and Figure 1h , the first protruding part 140 includes the first edges 141 and connecting edges 142, the first edges 141 are arranged in two, the two first edges 141 are oppositely arranged, and the connecting edges 142 are connected between the two first edges 141. Optionally, the connecting edges 142 are arc-shaped edges.

[0102] Referring to Figure 1h , in one embodiment, the first sub-protruding parts 1610 have two first sub-edges 1611 which are oppositely arranged, the second sub-protruding parts 1620 have two second sub-edges 1621 which are oppositely arranged, the first sub-edges 1611 and the second sub-edges 1621 jointly constitute the second edges, and the first edges 141, the first sub-edges 1611 and the second sub-edges 1621 are arranged in parallel.

[0103] In this specific example, the first sub-edges 1611 of the first sub-protruding parts 1610 and the second sub-edges 1621 of the second sub-protruding parts 1620 are arranged in parallel with the first edges 141 of the voice coil 14, which helps to maintain the uniformity of the magnetic gap, thereby ensuring the stable movement of the voice coil 14 in the magnetic gap.

[0104] Further, the edge magnetic part 17 includes edge magnets 171 and edge magnetic conductive plates 172, and the notches include notch structures formed by the edge magnets 171 and notch structures formed by the edge magnetic conductive plates 172. In addition, the edge magnetic part 17 includes two third edges which are oppositely arranged at the notches; wherein the third edges are parallel to the first edges 141. In this way, the uniformity of the width of the magnetic gap can be ensured, so that the voice coil 14 vibrates in a stable magnetic field.

[0105] Specifically, referring to Figure 1hAs shown, the side magnet 171 has two third sub-edges 1710 oppositely arranged at the notch of the side magnet 171, and the side flux-concentrating plate 172 has two fourth sub-edges 1720 oppositely arranged at the notch of the side flux-concentrating plate 172, the third sub-edges 1710 and the fourth sub-edges 1720 together form a third edge, and the third sub-edges 1710, the fourth sub-edges 1720 and the first edge 141 are arranged in parallel.

[0106] Further specifically, referring to Figure 1e As shown, the voice coil 14 is substantially rectangular, so that the shape of the voice coil 14 is more matched with the contour of the sound production device. The four first protrusions 140 are respectively located at the four corners of the rectangular shape, so that stress concentration is not easily generated in the voice coil 14, and the service life of the voice coil 14 is improved.

[0107] Further specifically, the shapes of the inner magnet 161 and the inner flux-concentrating plate 162 are both matched with the voice coil 14, i.e. the inner magnet 161 and the inner flux-concentrating plate 162 are both substantially rectangular, and the protrusions extended from the inner magnet 161 are arranged at the four corners, and the protrusions extended from the inner flux-concentrating plate 162 are also arranged at the four corners. That is, the first sub-protrusion 1610 is arranged at the four corners, and the second sub-protrusion 1620 is also arranged at the four corners.

[0108] Further specifically, referring to Figure 1h As shown, the number of the side magnets 171 and the side flux-concentrating plates 172 arranged is four. More specifically, the side magnets 171 include two first side magnets 1711 and two second side magnets 1712; and the side flux-concentrating plates 172 include two first side flux-concentrating plates 1721 and two second side flux-concentrating plates 1722. Among them, the two first side magnets 1711 and the two first side flux-concentrating plates 1721 correspond to the long sides of the rectangular voice coil 14, and the length thereof is longer; and the two second side magnets 1712 and the two second side flux-concentrating plates 1722 correspond to the short sides of the rectangular voice coil 14, and the length thereof is shorter.

[0109] Further, referring to Figure 1a As shown, the inner magnetic part 16 and the side magnetic part 17 are mounted to the magnetic yoke 18. The magnetic yoke 18 is provided with a relief structure 180 for avoiding the inner fixing part 152 of the elastic support 15, and the relief structure 180 can be a recessed groove or a through hole; in the case that the relief structure 180 is a through hole, it also serves as a leakage hole of the sound production device 1, and the leakage hole communicates the internal space and the external space of the sound production device.

[0110] In the sound production device 1, since the shape of the voice coil 14 is the above-mentioned special 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 side magnetic part 17, and the length of the voice coil wire can be effectively increased when the size of the voice coil is small, so as to improve the BL value, and thus the overall performance of the sound production device 1 is improved.

[0111] According to another embodiment of the present application, referring to Figure 2 As shown in the figure, a sound production module is provided, which comprises the sound production device 1 as above; further comprising a module housing 2, which forms a first sound production cavity Q1 with the first diaphragm 11, and the module housing 2 has a sound outlet 20, and the first sound production cavity Q1 is communicated with the sound outlet 20.

[0112] The sound production module provided by the embodiments of the present application contains the sound production device 1 as above, and compared with the conventional sound production module, the acoustic performance is improved under the condition of the same size. In the sound production module, the first sound production cavity Q1 is communicated with the sound outlet 20, and the second sound production cavity Q2 can also be communicated with the sound outlet 20. Specifically, the sound production module has an airflow channel communicated with the first sound hole 100 and the sound outlet 20, and the second sound production cavity Q2 is communicated with the sound outlet 20 through the first sound hole 100 and the airflow channel. Alternatively, as shown in the figure, the first sound hole 100 and the sound outlet 20 are opposite and communicated. Figure 2

[0113] According to another embodiment of the present application, referring to Figure 3 and Figure 4 An electronic device is provided, which comprises the sound production module as above.

[0114] The electronic device provided by the embodiments of the present application contains the sound production module as above, and the acoustic performance is better under the condition of the same size as the conventional electronic device. The electronic device has an electronic device housing 3 to form an electronic device cavity 30, and the sound production module is installed in the electronic device cavity 30; the electronic device housing 3 is also provided with an electronic device sound hole 31, which is communicated with the sound outlet 20 of the sound production module. The sound production module has a rear sound outlet channel 21, which is communicated with the electronic device cavity 30; the effective volume of the electronic device cavity is ≥2.5cc. In the electronic device of the embodiments of the present application, the electronic device cavity 30 of the electronic device is communicated through the rear sound outlet channel, and the rear cavity space of the sound production module is expanded by the electronic device cavity 30, which is beneficial to the diffusion of the rear cavity sound wave, reduces the reaction force of the compressed rear cavity air in the vibration process of the vibration system under the condition of the increased effective vibration area, so that the large-amplitude vibration of the vibration system can be realized, and the sound quality of the sound production module is improved; and the larger cavity volume can provide better heat dissipation space, which helps to reduce the temperature of the sound production module, thereby improving the stability and service life thereof.

[0115] In an embodiment, as shown in the figure, Figure 4 ​As shown, the magnetic circuit system of the sound-generating device is exposed in the module housing 2, and the sound-generating device is provided with a rear sound outlet channel 21. At this time, the electronic device cavity 30 is directly connected to the space behind the vibration system of the sound-generating device. Optionally, a rear sound outlet channel can be provided on the magnetic circuit system of the sound-generating device; or, a rear sound outlet channel can be provided on the outer shell of the sound-generating device; or, a rear sound outlet channel can be provided on both the magnetic circuit system and the outer shell of the sound-generating device. Specifically, when a rear sound outlet channel is provided on the magnetic circuit system of the sound-generating device, the rear sound outlet channel 21 is a leakage hole provided on the magnetic yoke 18.

[0116] In other embodiments, such as Figure 3 As shown, a rear acoustic cavity 22 is formed between the module housing 2 and the sound-generating device. A rear sound outlet channel 21 is disposed on the module housing 2, connecting the rear acoustic cavity 22 and the electronic device cavity 30. The diameter of the rear sound outlet channel 21 is ≥2.0mm. Specifically, the rear sound outlet channel is a circular through hole with a diameter greater than or equal to 2.0mm, which is more conducive to the diffusion of sound waves from the rear acoustic cavity 22 of the sound-generating module. It should be noted that in this embodiment, it is not necessary to provide damping components or other structures to cover the rear sound outlet channel. The function of the rear sound outlet channel 21 in this application is different from that of a traditional equalizing hole.

[0117] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. A sound producing device, characterized by, The sound generating device comprises: a housing having a receiving space, the housing being provided with a first sound outlet hole, the housing comprising a first shell and a second shell, the first shell and the second shell enclosing the receiving space; a magnetic circuit system arranged in the receiving space, the magnetic circuit system being fixed to the second shell, the magnetic circuit system having a magnetic gap; a vibration system comprising a first diaphragm, a second diaphragm, an intermediate partition membrane and a voice coil, the first diaphragm being arranged on a side of the housing away from the magnetic circuit system, an outer edge of the first diaphragm being fixed to the first shell; the second diaphragm being arranged on a side of the first diaphragm facing the magnetic circuit system, an outer edge of the second diaphragm being clamped between the first shell and the second shell; the intermediate partition membrane being arranged between the first diaphragm and the second diaphragm, an outer edge of the intermediate partition membrane being connected to the first shell; the voice coil being at least partially arranged in the magnetic gap, and the voice coil being connected to the first diaphragm, the second diaphragm and the intermediate partition membrane being located outside the voice coil; inner edges of the second diaphragm and the intermediate partition membrane are both connected to the first diaphragm; a closed second sound generating cavity is formed between the second diaphragm and the intermediate partition membrane, the second sound generating cavity being in communication with the first sound outlet hole.

2. The sound production device of claim 1, wherein, The first shell comprises a first side wall and an inner bending wall bent from the first side wall into the receiving space, and the outer edge of the first diaphragm and the outer edge of the intermediate partition membrane are fixed to the inner bending wall.

3. The sound production device of claim 2, wherein, The outer edges of the first diaphragm and the intermediate partition membrane are both fixed to the outer side of the inner bending wall, and the outer edge of the intermediate partition membrane is located between the outer edge of the first diaphragm and the inner bending wall; or, the outer edges of the first diaphragm and the intermediate partition membrane are respectively fixed to opposite sides of the inner bending wall. Furthermore, the first sound outlet hole is arranged on the first side wall or the inner bending wall.

4. The sound production device of claim 2, wherein, The first diaphragm further comprises a first flange located outside the outer edge of the first diaphragm, and the first flange is connected to the first side wall. Furthermore, the second diaphragm further comprises a second flange located outside the outer edge of the second diaphragm, and the second flange is connected to the first side wall or the second shell.

5. The sound production device of claim 1, wherein, The magnetic circuit system comprises a yoke, an inner magnetic part and an edge magnetic part arranged on the yoke, the edge magnetic part being located outside the inner magnetic part, the magnetic gap being formed between the inner magnetic part and the edge magnetic part, and the yoke being fixed to the second shell.

6. The sound production device of claim 5, wherein, The first shell is made of metal, the yoke and the first shell are welded together, at least one of the yoke and the first shell has a welding protrusion extending to the other, or the yoke and the first shell are welded together through a welding sheet; Furthermore, the second shell is made of metal, the yoke and the second shell are welded together, at least one of the yoke and the second shell has a welding protrusion extending to the other, or the yoke and the second shell are welded together through a welding sheet.

7. The sound production device of claim 1, wherein, The second vibrating diaphragm comprises a second folded ring and a second vibrating plate, an outer edge of the second folded ring is clamped between the first shell and the second shell, an inner side of the second folded ring is connected with an outer side of the second vibrating plate, and an inner side portion of the second vibrating plate is integrally bent and extended to the first vibrating diaphragm and connected with the first vibrating diaphragm.

8. The sound production device of claim 7, wherein, The inner side portion of the second vibrating plate comprises an inclined portion arranged at a predetermined angle with the vibration direction. The intermediate partition film is a flexible member, and an effective vibration area of the intermediate partition film is smaller than an effective vibration area of the second vibrating diaphragm.

9. The sound production device of claim 7, wherein, The first vibrating diaphragm comprises a first folded ring and a first vibrating plate, an outer edge of the first folded ring is connected with the first shell, an inner edge of the first folded ring is connected with the first vibrating plate, the intermediate partition film comprises a deformation portion, the first folded ring is convex towards a direction away from the second vibrating diaphragm, and the deformation portion is convex towards a direction close to the second vibrating diaphragm. The intermediate partition film comprises a deformation portion, the second folded ring is convex towards a direction close to the first vibrating diaphragm, the deformation portion is convex towards a direction away from the first vibrating diaphragm, and the second folded ring and the deformation portion are arranged in a horizontal direction.

10. The sound production device of claim 7, wherein, The sound generating device further comprises an elastic support arranged between the second shell and the second vibrating diaphragm, the elastic support comprises an outer fixed portion, a vibrating arm and an inner fixed portion connected in sequence, the outer fixed portion is clamped between an outer edge of the second vibrating diaphragm and the second shell, the inner fixed portion is fixed to the second vibrating plate, and the inner fixed portion is provided with a pad electrically connected with the voice coil.

11. A sound production module, comprising: The sound generating module comprises the sound generating device according to any one of claims 1-10, and further comprises a module shell, a first sound generating cavity is formed between the module shell and the first vibrating diaphragm, the module shell is provided with a sound outlet, and the first sound generating cavity is communicated with the sound outlet.

Images