Loudspeaker and electronic device

Abstract

The utility model discloses a loudspeaker and an electronic device, relates to loudspeaker structure technical field, the loudspeaker comprises a housing, and a magnetic circuit system and a vibration system connected with the housing, the magnetic circuit system has a magnetic gap, the vibration system comprises a first diaphragm, a voice coil, a middle diaphragm, a second diaphragm and a rigid connecting piece, the peripheral side of the first vibrating diaphragm is connected with the shell; the voice coil is connected with the first vibrating diaphragm, and at least part of the voice coil is arranged in the magnetic gap; the middle diaphragm is located on the second side of the first vibrating diaphragm, and the peripheral side of the middle diaphragm is connected with the shell; the second vibrating diaphragm comprises a second folding ring and a second vibrating plate, the outer peripheral side of the second folding ring is connected to the shell, and the second vibrating plate comprises a main body part connected with the inner peripheral side of the second folding ring and a bending part connected with the main body part and the middle diaphragm; the rigid connecting piece is connected between the second vibrating diaphragm and the voice coil. The utility model aims to provide a loudspeaker with small size and high performance.

Description

TECHNICAL FIELD

[0001] The utility model relates to loudspeaker structure technical field, especially a kind of loudspeaker and electronic equipment. BACKGROUND

[0002] With the rapid development of consumer electronics industry, people's requirements for electronic products are constantly improved, in addition to the performance difference of product itself, its portability, comfort is the several aspects that people focus on, current conventional loudspeaker scheme is difficult to simultaneously consider high performance, thin and light and multiple design requirements. SUMMARY

[0003] The utility model discloses a kind of loudspeaker and electronic equipment, to provide a kind of small size high-performance loudspeaker.

[0004] To achieve the above object, the utility model provides a kind of loudspeaker, wherein the loudspeaker includes shell, and the magnetic circuit system and vibration system connected with the shell, the magnetic circuit system has magnetic gap, the vibration system includes:

[0005] First diaphragm, with the first side in the first direction and second side, the outer circumferential side of the first diaphragm is connected with the shell, and the first side of the first diaphragm is first sound space;

[0006] Voice coil, set in the second side of the first diaphragm and connected with the first diaphragm, the voice coil is at least partially placed in the magnetic gap;

[0007] Intermediate diaphragm, annularly arranged and located at the second side of the first diaphragm, the outer circumferential side of the intermediate diaphragm is connected with the shell;

[0008] Second diaphragm, annularly arranged and located at the side of the intermediate diaphragm away from the first diaphragm, the second diaphragm includes second folding ring and second vibration plate, the outer circumferential side of the second folding ring is connected to the shell, and the second vibration plate includes main body part connected with the inner circumferential side of the second folding ring and bending part connected with the inner circumferential side of the main body part and the intermediate diaphragm, the intermediate diaphragm and the second diaphragm define second sound cavity, and the shell is provided with second sound hole, and the second sound hole communicates with the second sound cavity;And,

[0009] Rigid connecting piece is connected between the second diaphragm and the voice coil.

[0010] In an embodiment, the intermediate diaphragm is a flexible member, the intermediate diaphragm includes an outer connecting portion, a bending-shaped deformation portion, and an inner connecting portion, the outer connecting portion is connected with the shell, the inner connecting portion is connected with the bending portion, and the deformation portion connects the outer connecting portion and the inner connecting portion.

[0011] In an embodiment, the effective vibrating area of the intermediate diaphragm is less than the effective vibrating area of the second diaphragm; and / or,

[0012] In the projection along the first direction, the width of the deformation part of the intermediate diaphragm is greater than or equal to the width of the deformation part of the second folded ring; and / or,

[0013] The first diaphragm comprises a first folded ring and a first vibrating plate, the outer edge of the first folded ring is connected with the outer shell, the inner edge of the first folded ring is connected with the first vibrating plate, the compliance of the second folded ring and the compliance of the first folded ring are both less than the compliance of the intermediate diaphragm.

[0014] In an embodiment, the effective vibrating area of the intermediate diaphragm is less than the effective vibrating area of the second diaphragm, the ratio of the effective vibrating area of the intermediate diaphragm to the effective vibrating area of the second diaphragm is A, 1:3≤A≤1:1.5; and / or,

[0015] In the projection along the first direction, the width of the deformation part of the intermediate diaphragm is greater than or equal to the width of the deformation part of the second folded ring, the ratio of the width of the deformation part of the intermediate diaphragm to the width of the deformation part of the second folded ring is B, 1:1≤B≤3:1.

[0016] In an embodiment, the deformation part of the intermediate diaphragm is convexly arranged towards the second diaphragm, the deformation part of the second folded ring is convexly arranged towards the first diaphragm, the deformation part of the intermediate diaphragm and the deformation part of the second folded ring are arranged in a staggered manner in a second direction, the second direction is perpendicular to the first direction.

[0017] In an embodiment, the first diaphragm comprises a first folded ring and a first vibrating plate, the outer edge of the first folded ring is connected with the outer shell, the inner edge of the first folded ring is connected with the first vibrating plate, the deformation part of the first folded ring is convexly arranged towards the intermediate diaphragm, and the deformation part of the first folded ring corresponds to the deformation part of the intermediate diaphragm.

[0018] In an embodiment, the loudspeaker further comprises an elastic support, the elastic support comprises an outer fixed part, an inner fixed part and an elastic arm connecting the outer fixed part and the inner fixed part, the outer fixed part is connected to the outer shell and a first electrical connection part is arranged thereon, the inner fixed part supports a second electrical connection part electrically connected with the voice coil and is connected to the second vibrating plate and the voice coil.

[0019] In an embodiment, the outer fixed part is arranged in a ring shape, the inner fixed part is arranged on the inner side of the outer fixed part and is connected with the inner side of the outer fixed part through the elastic arm; and / or,

[0020] The outer fixing part is annular, and the first electrical connection part is arranged on the outer periphery of the outer fixing part; and / or,

[0021] The outer fixing part is annular, and the outer fixing part has alternating short-axis sides and long-axis sides, the elastic arms are led out from one side of the short-axis side corresponding to the inner fixing part, and after being bent, the elastic arms extend along the long-axis side, and the elastic arms are connected to the central region of the long-axis side; and / or,

[0022] The inner fixing part includes a body part and an extension part extending from the body part towards the voice coil, the body part is connected with the second vibration plate, the extension part is connected with the voice coil, and the second electrical connection part is arranged on the extension part or the body part.

[0023] In an embodiment, the rigid connecting piece is connected to the side of the inner fixing part opposite to the second diaphragm.

[0024] In an embodiment, the magnetic circuit system includes:

[0025] a central magnet; and

[0026] a peripheral magnet arranged at the periphery of the central magnet and defining the magnetic gap with the central magnet;

[0027] The peripheral magnet is provided with a clearance hole for the elastic support and the rigid connecting piece to pass through.

[0028] In an embodiment, the intermediate partition film has a first extension part extending to the clearance hole, the second vibration plate has a second extension part extending to the clearance hole, and the first extension part and the second extension part are connected correspondingly; or

[0029] The voice coil has a first protruding part extending to the clearance hole, the central magnet has a second protruding part extending to the clearance hole, and the first protruding part and the second protruding part are arranged correspondingly.

[0030] In an embodiment, the housing includes a first housing and a second housing arranged oppositely in a first direction;

[0031] The outer periphery of the first diaphragm is fixed to the first housing, the magnetic circuit system is fixed to the second housing, the outer periphery of the second folding ring is clamped between the first housing and the second housing, the outer periphery of the intermediate partition film is fixed to the first housing, and the second sound outlet is arranged in the first housing.

[0032] In an embodiment, the first housing includes:

[0033] a main body section arranged in a ring shape; and

[0034] a bending section located at an end of the main body section away from the second housing and extending towards an inner side of the main body section, an outer periphery of the first diaphragm and an outer periphery of the intermediate diaphragm being fixed to an end of the bending section away from the main body section;

[0035] wherein the second sound hole is arranged in the main body section or the bending section.

[0036] In an embodiment, the second sound hole is arranged in the main body section, the outer periphery of the first diaphragm and the outer periphery of the intermediate diaphragm are fixed to both sides of an end of the bending section away from the main body section or the outer periphery of the intermediate diaphragm is sandwiched between the outer periphery of the first diaphragm and the bending section; or,

[0037] the second sound hole is arranged in the bending section, the first housing further comprises a connecting frame connected to an end of the bending section away from the main body section, the outer periphery of the first diaphragm is connected to one end of the connecting frame, and the outer periphery of the intermediate diaphragm is connected to the other end of the connecting frame or the bending section.

[0038] In an embodiment, the outer periphery of the first diaphragm is provided with a first flange connected to the first housing; and / or the outer periphery of the second diaphragm is provided with a second flange connected to the first housing.

[0039] In an embodiment, the loudspeaker further comprises an elastic support, the elastic support comprising:

[0040] an outer fixing portion, the outer fixing portion and the outer periphery of the second diaphragm being sandwiched between the first housing and the second housing, and an outer periphery of the outer fixing portion being provided with a first electrical connection portion protruding out of the outer shell;

[0041] an inner fixing portion supporting the voice coil connected to the second diaphragm, and the inner fixing portion being provided with a second electrical connection portion electrically connected to the voice coil; and

[0042] a spring arm connecting the outer fixing portion and the inner fixing portion.

[0043] In an embodiment, the magnetic circuit system comprises:

[0044] a magnetic yoke;

[0045] a center magnet arranged on the magnetic yoke; and

[0046] a peripheral magnet arranged on the magnetic yoke and located at the periphery of the center magnet, and the magnetic gap being defined between the peripheral magnet and the center magnet; wherein,

[0047] The first shell and the second shell are metal shells, the magnetic yoke and the second shell are integrally formed, and the first shell and the second shell are weldedly connected; or the first shell is a metal shell, and the magnetic yoke and the first shell are weldedly connected.

[0048] In an embodiment, the rigid connecting member connects the voice coil away from one end of the first diaphragm.

[0049] In an embodiment, the magnetic circuit system comprises:

[0050] a magnetic yoke;

[0051] a center magnet arranged on the magnetic yoke; and

[0052] a peripheral magnet arranged on the magnetic yoke and located at the periphery of the center magnet, and the magnetic gap is defined between the peripheral magnet and the center magnet;

[0053] The magnetic yoke is provided with a relief groove corresponding to the position of the rigid connecting member.

[0054] In an embodiment, the relief groove is a through hole provided through the magnetic yoke.

[0055] In an embodiment, the first diaphragm comprises a first folding ring and a first vibration plate, the outer circumferential side of the first folding ring is connected with the housing, and the inner circumferential side of the first folding ring is connected with the first vibration plate.

[0056] The first vibration plate is integrally provided with a protruding portion connected with the voice coil; or an end portion of the voice coil is fixed with a connecting plate, and the connecting plate connects the voice coil with the first vibration plate.

[0057] In an embodiment, the bending portion comprises an inclined segment arranged at an angle with the first direction, and the inclined segment is connected with the main body portion.

[0058] In an embodiment, the magnetic circuit system has an expansion portion corresponding to the inclined segment, and the distance between the outer edge of the expansion portion and the inclined segment in the first direction is greater than the amplitude of the second vibration plate.

[0059] In an embodiment, the housing and the first side of the first diaphragm define the first sound outlet space, and the housing is provided with a first sound outlet hole communicating with the first sound outlet space; or

[0060] The housing is provided with an opening corresponding to one end of the first side of the first diaphragm.

[0061] In an embodiment, the housing is open at an end corresponding to the first side of the first diaphragm, and the speaker further comprises a cover, the cover being arranged on the open end of the housing to define the first sound radiation space between the first side of the first diaphragm and the cover, the cover being provided with a first sound hole communicating with the first sound radiation space.

[0062] In an embodiment, the first sound hole is opposite and communicates with the second sound hole, and sound waves in the second sound cavity are radiated to the outside through the second sound hole and the first sound hole; or,

[0063] The second sound hole is arranged on the housing at a position corresponding to the first sound radiation space to communicate the first sound radiation space with the second sound cavity.

[0064] The utility model further provides an electronic equipment, wherein the electronic equipment comprises:

[0065] a cavity, which is provided with an electronic equipment sound hole; and

[0066] a speaker, the speaker comprising a housing, a magnetic circuit system connected to the housing, and a vibration system, the magnetic circuit system having a magnetic gap, the vibration system comprising a first diaphragm, a voice coil, an intermediate membrane, a second diaphragm, and a rigid connecting piece, the first diaphragm having a first side and a second side in a first direction, the outer periphery of the first diaphragm being connected to the housing, and the first side of the first diaphragm being a first sound radiation space; the voice coil being arranged on the second side of the first diaphragm and connected to the first diaphragm, and the voice coil being at least partially arranged in the magnetic gap; the intermediate membrane being annularly arranged on the second side of the first diaphragm, and the outer periphery of the intermediate membrane being connected to the housing; the second diaphragm being annularly arranged on a side of the intermediate membrane away from the first diaphragm, and the second diaphragm comprising a second folded ring and a second vibration plate, the outer periphery of the second folded ring being connected to the housing, and the second vibration plate comprising a main body connected to the inner periphery of the second folded ring, and a bending portion connected to the inner periphery of the main body and the intermediate membrane, a second sound cavity being defined between the intermediate membrane and the second diaphragm, a second sound hole being arranged on the housing and communicating with the second sound cavity; and the rigid connecting piece being connected between the second diaphragm and the voice coil, the first sound radiation space and the second sound cavity both communicating with the electronic equipment sound hole.

[0067] In an embodiment, the first rear sound cavity is defined between the first diaphragm and the middle spacer diaphragm, the second rear sound cavity is defined on a side of the second diaphragm facing away from the middle spacer diaphragm, the first rear sound cavity and the second rear sound cavity are in communication, the loudspeaker is provided with a rear sound passage, the first rear sound cavity and the second rear sound cavity are in communication with the cavity through the rear sound passage, and the effective volume of the cavity is greater than or equal to 2.5 cc.

[0068] In the technical scheme of the utility model, the middle spacer diaphragm and the second diaphragm are added on the basis of the conventional loudspeaker, the relative change in volume of the middle spacer diaphragm and the second diaphragm during the operation of the loudspeaker is utilized to push air to increase the effective vibration area during the vibration of the loudspeaker, thereby improving the performance of the loudspeaker, and specifically, the vibration system comprises the first diaphragm and the second diaphragm for vibrating and sounding, the first diaphragm is a basic setting of the loudspeaker, that is, the first side of the first diaphragm is the first sound space, the second diaphragm is connected with the middle spacer diaphragm to define the second sound cavity between the second diaphragm and the middle spacer diaphragm, and the second sound hole corresponding to the second sound cavity is formed in the shell, the voice coil is arranged in the magnetic gap and can vibrate under the control of electricity, the voice coil is connected with the first diaphragm, and the voice coil is connected with the second diaphragm through the rigid connecting piece, so that the voice coil can drive the first diaphragm and the second diaphragm to vibrate simultaneously when the voice coil vibrates, thereby forming the double-diaphragm structure of the vibration system, so that the first diaphragm sounds through the first sound space, the second diaphragm sounds through the second sound cavity, and both of them share a rear sound cavity, thereby effectively increasing the effective vibration area of the vibration system, and the loudspeaker proposed in the application has better acoustic performance in the loudspeaker structure of the same size, and the loudspeaker structure proposed in the application can have a smaller structure size on the basis of the same acoustic performance, so that the small-size high-performance loudspeaker proposed in the application is obtained, thereby meeting the demand. BRIEF DESCRIPTION OF DRAWINGS

[0069] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained from the structures shown in the drawings without creative labor for those skilled in the art.

[0070] Figure 1 It is an explosion schematic view of the first embodiment of the loudspeaker provided by the utility model.

[0071] Figure 2 It is anFigure 1 A cross-sectional view of the loudspeaker in

[0072] Figure 3 A cross-sectional view of the loudspeaker in Figure 1 Another cross-sectional view of the loudspeaker in

[0073] Figure 4 A plan view of the loudspeaker in Figure 1 Another plan view of the loudspeaker in

[0074] Figure 5 A plan view of the loudspeaker in Figure 1 Another plan view of the loudspeaker in

[0075] Figure 6 A perspective view of a part of the loudspeaker in Figure 1 Another perspective view of a part of the loudspeaker in

[0076] Figure 7 An exploded view of the rigid connecting member and the elastic supporting member in Figure 1 An assembly structure view of the rigid connecting member and the elastic supporting member in

[0077] Figure 8 An assembly structure view of the rigid connecting member and the elastic supporting member in Figure 1 A plan view of the relative position relationship between the intermediate diaphragm, the second vibrating plate and the voice coil in

[0078] Figure 9 A perspective view of the intermediate diaphragm in Figure 1 A perspective view of the second vibrating plate in

[0079] Figure 10 A plan view of the relative position relationship between the intermediate diaphragm, the second vibrating plate and the voice coil in Figure 9 Another plan view of the relative position relationship between the intermediate diaphragm, the second vibrating plate and the voice coil in

[0080] Figure 11 A perspective view of the second vibrating plate in Figure 9 A perspective view of the second vibrating plate in

[0081] Figure 12 A plan view of the relative position relationship between the intermediate diaphragm, the second vibrating plate and the voice coil in Figure 1 Another plan view of the relative position relationship between the intermediate diaphragm, the second vibrating plate and the voice coil in

[0082] Figure 13 A perspective view of the loudspeaker in Figure 12 Another perspective view of the loudspeaker in

[0083] Figure 14 An exploded view of the loudspeaker in Figure 13 Another exploded view of the loudspeaker in

[0084] Figure 15 A cross-sectional view of the second embodiment of the loudspeaker provided by the utility model

[0085] Figure 16 A cross-sectional view of the second embodiment of the loudspeaker provided by the utility model Figure 15Another cross-sectional view of the loudspeaker in the first embodiment of the electronic device provided by the utility model;

[0086] Figure 17 A cross-sectional view of the first embodiment of the electronic device provided by the utility model is provided.

[0087] Figure 18 A cross-sectional view of the third embodiment of the loudspeaker provided by the utility model is provided.

[0088] Figure 19 A cross-sectional view of the fourth embodiment of the loudspeaker provided by the utility model is provided.

[0089] Figure 20 To Figure 19 Another cross-sectional view of the loudspeaker in the first embodiment of the electronic device provided by the utility model;

[0090] Figure 21 A cross-sectional view of the second embodiment of the electronic device provided by the utility model is provided.

[0091] Explanation of reference numerals:

[0092] 1000, electronic device; 100, loudspeaker; 1, magnetic circuit system; 1a, magnetic gap; 11, center magnet; 111, second protruding part; 12, peripheral magnet; 121, extension part; 13, let hole; 14, magnetic yoke; 141, avoiding slot; 2, vibration system; 21, first diaphragm; 211, first folded ring; 212, first vibration plate; 22, voice coil; 221, first protruding part; 23, intermediate separation film; 231, deformation part; 232, first extension part; 24, second diaphragm; 241, second folded ring; 242, second vibration plate; 2421, main body part; 2422, bent part; 2422a, inclined section; 2423, second extension part; 25, rigid connecting piece; 3, shell; 31, first shell; 311, main body section; 312, bent section; 313, connecting frame; 32, second shell; 4a, first sound outlet space; 4b, first rear sound outlet cavity; 5, first sound outlet hole; 6a, second sound outlet cavity; 6b, second rear sound outlet cavity; 7, second sound outlet hole; 8, elastic support piece; 81, outer fixed part; 811, first electric connection part; 82, inner fixed part; 821, second electric connection part; 83, elastic arm; 9, connecting plate; 10, shell cover; 101, rear sound outlet channel; 200, cavity; 201, electronic device sound outlet hole.

[0093] The realization, functional features and advantages of the utility model will be further explained in combination with embodiments and with reference to the drawings. DETAILED DESCRIPTION

[0094] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described, obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0095] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0096] In addition, if the embodiments of the present application involve descriptions of "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously satisfy the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skill in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0097] With the rapid development of the consumer electronics industry, people's requirements for electronic products are constantly improving, in addition to the performance difference of the product itself, its portability, comfort is one of the aspects that people focus on, and the current conventional loudspeaker scheme is difficult to simultaneously meet the design requirements of high performance, thin and light, etc.

[0098] Therefore, the present application provides a loudspeaker, please refer to Figures 1 to 21 For the embodiments of the loudspeaker proposed in the present application, the loudspeaker will be described in detail below in combination with specific drawings.

[0099] Please refer to Figures 1 to 4 and Figure 18The loudspeaker 100 comprises a housing 3, a magnetic circuit system 1 and a vibration system 2 connected with the housing 3, the magnetic circuit system 1 has a magnetic gap 1a, the vibration system 2 comprises a first diaphragm 21, a voice coil 22, an intermediate partition membrane 23, a second diaphragm 24 and a rigid connecting piece 25, the first diaphragm 21 has a first side and a second side in a first direction, the outer circumferential side of the first diaphragm 21 is connected with the housing 3, and the first side of the first diaphragm 21 is a first sound outlet space 4a; the voice coil 22 is arranged on the second side of the first diaphragm 21 and connected with the first diaphragm 21, and the voice coil 22 is at least partially arranged in the magnetic gap 1a; the intermediate partition membrane 23 is arranged in a ring shape and located on the second side of the first diaphragm 21, and the outer circumferential side of the intermediate partition membrane 23 is connected with the housing 3; the second diaphragm 24 is arranged in a ring shape, and the second diaphragm 24 is located on a side of the intermediate partition membrane 23 away from the first diaphragm 21, the second diaphragm 24 comprises a second folded ring 241 and a second vibration plate 242, the outer circumferential side of the second folded ring 241 is connected with the housing 3, the second vibration plate 242 comprises a main body part 2421 connected with the inner circumferential side of the second folded ring 241, and a bending part 2422 connected with the inner circumferential side of the main body part 2421 and the intermediate partition membrane 23, a second sound outlet cavity 6a is defined between the intermediate partition membrane 23 and the second diaphragm 24, a second sound outlet hole 7 is arranged on the housing 3 and communicates with the second sound outlet cavity 6a; and the rigid connecting piece 25 is connected between the second diaphragm 24 and the voice coil 22.

[0100] The utility model discloses a technical scheme, on the basis of conventional loudspeaker 100 increases the intermediate diaphragm 23 and the second diaphragm 24, utilizes the relative change of intermediate diaphragm 23 and the volume of second diaphragm 24 to push air to increase the effective vibration area when the loudspeaker 100 vibrates, thereby improving the performance of loudspeaker 100, specifically vibration system 2 includes the first diaphragm 21 for vibrating sounding and second diaphragm 24, and the first diaphragm 21 is the basic setting of loudspeaker 100, that is, the first side of first diaphragm 21 is first sound outlet space 4a, and second diaphragm 24 is connected with intermediate diaphragm 23 to define the second sound cavity 6a between second diaphragm 24 and intermediate diaphragm 23, and the second sound hole 7 corresponding to second sound cavity 6a is set up on the shell 3, and the voice coil 22 is arranged in the magnetic gap 1a, and can vibrate under the control of electric power, and the voice coil 22 is connected with the first diaphragm 21, and the voice coil 22 is connected with the second diaphragm 24 through the rigid connecting piece 25, so that the voice coil 22 can drive the first diaphragm 21 and the second diaphragm 24 to vibrate when vibrating, to form the double diaphragm structure of vibration system 2, so that the first diaphragm 21 sounds through first sound outlet space 4a, and the second diaphragm 24 sounds through second sound cavity 6a, and they share a rear sound cavity, so that the effective vibration area of vibration system 2 is effectively improved, and the loudspeaker 100 proposed in the application has better acoustic performance in the structure of the loudspeaker 100 of the same size, and the loudspeaker 100 proposed in the application can have a smaller structure size on the basis of the same acoustic performance, so that the small-size high-performance loudspeaker 100 proposed in the application is obtained, meeting the demand. It can be understood that the rigid connecting piece 25 is made of stainless steel or other metal materials or carbon fiber or other high molecular materials with certain strength.

[0101] Specifically, the intermediate diaphragm 23 is a flexible member, and the intermediate diaphragm includes an outer connecting portion, a bending-shaped deformation portion 231, and an inner connecting portion. The outer connecting portion is connected with the shell 3, the inner connecting portion is connected with the bending portion 2422, and the deformation portion connects the outer connecting portion and the inner connecting portion. The intermediate diaphragm 23 is mainly used to define the second sound cavity 6a with the second diaphragm 24, and the inner circumferential side of the intermediate diaphragm 23 is connected with the second diaphragm 24, so that the intermediate diaphragm 23 needs to vibrate together with the second diaphragm 24. Therefore, the intermediate diaphragm 23 needs to be designed as a flexible structure to meet the structural function requirements. Based on the conventional setting mode of the diaphragm in the loudspeaker 100, that is, the folding ring structure is set to meet the flexible connection requirements during vibration. In this embodiment, a folding ring structure is also arranged at the intermediate diaphragm 23, that is, the bending-shaped deformation portion 231 is arranged, which meets the structural function requirements, adopts conventional parts, is convenient for production and manufacturing, and has low cost.

[0102] Further, the effective vibration area of the intermediate diaphragm 23 is smaller than the effective vibration area of the second diaphragm 24.

[0103] It can be understood that the second sound cavity 6a defined between the second diaphragm 24 and the intermediate partition membrane 23 provides sound waves of the same phase as the sound waves radiated by the first diaphragm 21 in the vibration process of the second diaphragm 24, and the intermediate partition membrane 23 provides sound waves of the opposite phase to the sound waves radiated by the first diaphragm 21 in the vibration process of the second diaphragm 24, that is, the sound performance of the second sound cavity 6a is weakened, so on the basis of meeting the structural function requirements, the effective vibration area of the intermediate partition membrane 23 should be set to be smaller than the effective vibration area of the second diaphragm 24, so that the sound waves of the second sound cavity 6a and the sound waves of the first sound cavity 4a are of the same phase and are positively superimposed, and the FR (frequency response) of the loudspeaker 100 is improved. Specifically, in an embodiment of the present application, the ratio of the effective vibration area of the intermediate partition membrane 23 to the effective vibration area of the second diaphragm 24 is limited to 1:3 to 1:1.5, which avoids the problem that when the ratio is too large, the size of the intermediate partition membrane 23 is too large and has a great influence on the sound performance of the second sound cavity 6a, and at the same time, when the ratio is too small, the size of the intermediate partition membrane 23 is too small and needs to meet a larger amplitude, so that the flexibility of the material is required to be high, thereby causing the problem of high cost.

[0104] Further optionally, in the projection along the first direction, the width of the deformed portion 231 of the intermediate partition membrane 23 is greater than or equal to the width of the deformed portion of the second folded ring 241.

[0105] It can be understood that the width of the deformed portion 231 of the intermediate partition membrane 23 is greater than or equal to the width of the deformed portion of the second folded ring 241, which helps to improve the ductility of the intermediate partition membrane 23 and avoid hindering the vibration of the second diaphragm 24 in the following process; on the other hand, the outer connecting portion of the intermediate partition membrane 23 forms a fixed end with the shell 3, and only the inner connecting portion is a free end, so the effective vibration area of the intermediate partition membrane 23 in the vibration process is small; at the same time, the second diaphragm 24 includes a second folded ring 241 made of a flexible material and a second vibration plate 242 made of a rigid material, both ends of the second vibration plate 242 are free ends, and the projection size of the second vibration plate 242 along the first direction is the effective vibration area thereof, which contributes more to the effective vibration area of the second diaphragm 24 than the second folded ring 241 (the calculation of the effective vibration area is the same as that of the intermediate partition membrane 23). At this time, the width of the deformed portion of the second folded ring 241 is smaller than the width of the deformed portion 231 of the intermediate partition membrane 23, so the size of the second vibration plate 242 is increased, the effective vibration area of the second diaphragm 24 is increased, and the vibration performance of the second diaphragm 24 is effectively improved.

[0106] Specifically, in another embodiment of the present application, the ratio of the width of the deformed portion 231 of the intermediate partition membrane 23 to the width of the deformed portion of the second diaphragm 24 is limited to 1:1 to 3:1. Within this range, the vibration performance of the second diaphragm 24 and the sound performance of the second sound cavity 6a are better.

[0107] Further, the first diaphragm 21 comprises a first folded ring 211 and a first vibrating plate 212, the outer edge of the first folded ring 211 is connected with the shell 3, the inner edge of the first folded ring 211 is connected with the first vibrating plate 212, the compliance of the second folded ring 241 and the compliance of the first folded ring 211 are both less than the compliance of the intermediate diaphragm 23.

[0108] It can be understood that the compliance of the intermediate diaphragm 23 is greater than the compliance of the second folded ring 241 and the compliance of the first folded ring 211, at this time, the intermediate diaphragm 23 only plays a role of isolation and sealing, and does not affect the vibration performance of the first diaphragm 21 and the second diaphragm 24, thereby improving the low-frequency sensitivity of the loudspeaker.

[0109] In the above embodiments, the first vibrating plate 212 and the second vibrating plate 242 can be metal materials such as magnesium-aluminum alloy and magnesium-lithium alloy. The intermediate diaphragm 23 is a flexible material such as single-layer PEEK (polyether ether ketone) film and composite PEEK (polyether ether ketone) film, and the materials of the first folded ring 211 and the second folded ring 241 can be the same as or different from the material of the intermediate diaphragm 23, which is selected according to actual needs.

[0110] In addition, the intermediate diaphragm 23 comprises a deformation portion 231, which is protrudingly arranged towards the second diaphragm 24. The intermediate diaphragm 23 comprising the deformation portion 231 has been described above and will not be described again here. The deformation portion 231 can be protrudingly arranged towards the first diaphragm 21 or the second diaphragm 24, which both meet the functional requirements. In the embodiment, the deformation portion 231 is arranged to protrude towards the second diaphragm 24, so as to avoid affecting the vibration stroke of the first diaphragm 21, that is, to avoid interfering with the vibration sound of the first diaphragm 21, so that the distance between the first diaphragm 21 and the intermediate diaphragm 23 can be reduced, thereby achieving the purpose of thin and light structure design of reducing the size of the loudspeaker 100 in the first direction.

[0111] Further, the first diaphragm 21 comprises a first folded ring 211, which is protrudingly arranged towards the intermediate diaphragm 23. Since the deformation portion 231 is protrudingly arranged towards the second diaphragm 24, so as to not interfere with the space between the intermediate diaphragm 23 and the first diaphragm 21. In order to further thin and light the loudspeaker 100, the first folded ring 211 arranged on the first diaphragm 21 is arranged to protrude towards the intermediate diaphragm 23, so as to utilize the space between the first diaphragm 21 and the intermediate diaphragm 23 to accommodate the protruding first folded ring 211, thereby achieving the purpose of reducing the height size of the loudspeaker 100.

[0112] Further, the deformation portion 231 is arranged opposite to the deformation portion of the first folding ring 211. Based on the structure of the first folding ring 211 and the deformation portion 231 described above, the present embodiment defines the relative position relationship between the deformation portion 231 and the first folding ring 211. Specifically, when the deformation portion 231 is arranged protruding towards the second diaphragm 24, a groove is necessarily formed on the side of the deformation portion 231 facing the first diaphragm 21. In the present embodiment, the first folding ring 211 is arranged opposite to the deformation portion 231. On the one hand, the groove avoids the vibration of the first folding ring 211, thereby avoiding structural interference. On the other hand, the distance between the first diaphragm 21 and the middle spacer 23 can be further reduced, thereby further reducing the height of the loudspeaker 100 and achieving further light and thin design requirements.

[0113] In addition, the second folding ring 241 is arranged protruding towards the middle spacer 23. The second folding ring 241 is arranged offset from the deformation portion 231 in a second direction, which is perpendicular to the first direction. In order to avoid the second folding ring 241 occupying the space on the side of the second diaphragm 24 facing away from the middle spacer 23, thereby avoiding possible structural interference, the present application arranges the second folding ring 241 to protrude towards the middle spacer 23. In combination with the structure of the deformation portion 231 protruding towards the second diaphragm 24, the present embodiment arranges the second folding ring 241 offset from the deformation portion 231, thereby avoiding the relative interference between the two, which can increase the height of the loudspeaker 100, and further meeting the light and thin structure arrangement requirements.

[0114] In addition, please refer to Figures 6 to 8The loudspeaker 100 further comprises an elastic support 8, which comprises an outer fixed part 81, an inner fixed part 82, and an elastic arm 83 connecting the outer fixed part 81 and the inner fixed part 82. The outer fixed part 81 is connected to the shell 3 and is provided with a first electrical connecting part 811 thereon. The inner fixed part 82 supports the second vibrating plate 242 and the voice coil 22, and is provided with a second electrical connecting part 821 electrically connected to the voice coil 22. It can be understood that, in order to realize the vibration of the voice coil 22 in the magnetic gap 1a according to a certain vibration requirement, so as to emit the required sound, the voice coil 22 needs to be connected to an electrical signal, i.e., an electrical connecting part needs to be provided to connect the voice coil 22 and an external signal source of the loudspeaker 100. Specifically, the electrical connecting part can be provided in various ways, for example, it can be a flexible wire structure, or a rigid connecting structure arranged along the vibration direction of the voice coil 22 and capable of synchronously moving with the voice coil 22. Here, no specific limitation is made, and it is only required that the voice coil 22 can be connected to the external signal source. In the embodiment, the elastic support 8 is provided, which, on the one hand, connects the voice coil 22 and the external signal source through the elastic support 8, and on the other hand, realizes the constraint of the second vibrating plate 24 vibration system 2 in the first direction, i.e., the vibration direction, through the provision of the elastic support 8, so as to better inhibit the performance deterioration caused by the large-amplitude vibration deviation. Specifically, the inner fixed part 82 and the outer fixed part 81 are connected by the elastic arm 83. The outer fixed part 81 is fixed to the shell 3, and the inner fixed part 82 is fixed between the voice coil 22 and the second vibrating plate 24, so as to realize the above-mentioned constraint effect through the elasticity of the elastic arm 83 itself. Meanwhile, the first electrical connecting part 811 connected to the external signal source is provided on the outer fixed part 81, and the second electrical connecting part 821 connected to the voice coil 22 is provided on the inner fixed part 82. Through the electrical conductivity of the elastic arm 83, the inner fixed part 82, and the outer fixed part 81, the first electrical connecting part 811 and the second electrical connecting part 821 are realized to be in conduction, so as to meet the above-mentioned structural and functional requirements.

[0115] Specifically, the outer fixing part 81 is annularly arranged, the inner fixing part 82 is arranged at the inner side of the outer fixing part 81 and is connected with the inner side of the outer fixing part 81 through the elastic arm 83, the structure of the outer fixing part 81 and the inner fixing part 82 is not specifically limited here, the elastic arm 83 can be connected to achieve the above-described constraint effect, and the first electric connection part 811 and the second electric connection part 821 can be electrically connected, and in the embodiment, the outer fixing part 81 is arranged in an annular structure to stably cooperate with the shell 3 and improve the connection and support stability of the elastic support 8. Based on this, the elastic arm 83 can be connected to the inner side of the outer fixing part 81 and the inner fixing part 82, and according to the structure of the annularly arranged outer fixing part 81 and the resulting structural stability, the elastic arm 83 can extend along the inner edge of the outer fixing part 81 to increase the length of the elastic arm 83 and thus improve the reliability of the second diaphragm 24 when working at a large amplitude. That is, the outer fixing part 81 is arranged to have alternating short-axis sides and long-axis sides, the elastic arm 83 is led out from one side of the short-axis side of the inner fixing part 82 and extends along the long-axis side after being bent, and the elastic arm 83 is connected to the center region of the long-axis side. In this way, the length of the elastic arm 83 is increased, the stress is improved, and the reliability is improved.

[0116] In addition, the inner fixing part 82 includes a body part and an extension part extending from the body part towards the voice coil 22, the body part is connected with the second vibration plate 242, and the extension part is connected with the voice coil 22. The second electric connection part 821 is provided on the extension part or the body part, and the setting position of the second electric connection part 821 on the inner fixing part 82 can not be limited. The inner fixing part 82 is used to connect the second vibration plate 242 and the voice coil 22, that is, the inner fixing part 82 at least includes a body part for connecting with the second vibration plate 242 and an extension part extending from the body part to connect the voice coil. The second electric connection part 821 can be provided on the body part or the extension part, and the specific setting position of the second electric connection part 821 on the body part or the extension part is also not limited, as long as the functional requirements are met.

[0117] In addition, the first electric connection part 811 is used to connect with an external signal source, which has been described above. In the embodiment, the first electric connection part 811 is arranged on the outer periphery side of the outer fixing part 81. On the one hand, the first electric connection part 811 can be extended out of the shell 3, and on the other hand, the first electric connection part 811 can be fixed to the shell 3, so that the structural stability is strong. Of course, the first electric connection part 811 can also be connected with the external signal source through other connection structures, so that the setting position of the first electric connection part 811 is not limited, and the electrical connection function can also be achieved, but it is obviously more complicated and not practical.

[0118] Further, the rigid connecting piece 25 is connected to the inner fixing part 82 on the side facing away from the second diaphragm 24. The inner fixing part 82 and the rigid connecting piece 25 can be independent structures, that is, they are respectively connected to the voice coil 22 and the second diaphragm 24, or they can have a certain relative position relationship. In the embodiment, the connection and support functions of the inner fixing part 82 and the rigid connecting piece 25 are considered to be the same, so the rigid connecting piece 25 is connected to the inner fixing part 82 to jointly connect the voice coil 22 and the second diaphragm 24. In this way, the connection structure of the inner fixing part 82 and the voice coil 22 is strengthened through the rigid connecting piece 25, thereby ensuring the stability of the electrical connection between the second electrical connection part 821 on the inner fixing part 82 and the voice coil 22. At the same time, the inner fixing part 82 is clamped between the rigid connecting piece 25 and the voice coil 22, so that the distance between the inner fixing part 82 and the magnetic circuit system 1 is increased. The second electrical connection part 821 is arranged on the side of the inner fixing part 82 facing away from the rigid connecting piece 25, and the lead wire of the voice coil 22 is spot-welded to the second electrical connection part 821. In this way, only part of the magnetic circuit system 1 needs to be arranged to avoid the rigid connecting piece 25, reducing the need to avoid the lead wire of the voice coil 22, which is conducive to thin-type design.

[0119] In addition, referring to Figures 1 to 4 and Figure 18 , the magnetic circuit system 1 includes a center magnet 11 and a peripheral magnet 12. The peripheral magnet 12 is arranged at the periphery of the center magnet 11 and defines a magnetic gap 1a with the center magnet 11. The peripheral magnet 12 is provided with a clearance hole 13 for the elastic support 8 and the rigid connecting piece 25 to pass through. The center magnet 11 and the peripheral magnet 12 form a magnetic field environment required for the voice coil 22 to vibrate. Generally, the peripheral magnet 12 is composed of a plurality of magnets arranged at the periphery of the center magnet 11. The plurality of magnets are spaced apart to form the clearance hole 13. The elastic support 8 and the rigid connecting piece 25 can extend into the magnetic gap 1a from the clearance hole 13 to connect with the voice coil 22, meeting the structural and functional requirements.

[0120] Further, referring to Figures 9 to 11 , in an embodiment, the intermediate separation membrane 23 has a first extension part 232 extending to the clearance hole 13, and the second vibration plate 242 has a second extension part 2423 extending to the clearance hole 13. The first extension part 232 and the second extension part 2423 are correspondingly connected. In this way, on the one hand, the space at the clearance hole 13 is utilized to further increase the size of the second vibration plate 242 and the size of the second sound cavity 6a enclosed by the second vibration plate 242 and the intermediate separation membrane 23, so as to further improve the sound production effect without increasing the height of the loudspeaker 100. On the other hand, by providing the first extension part 232 and the second extension part 2423, the structural strength of the intermediate separation membrane 23 and the second vibration plate 242 is also improved.

[0121] In addition, referring to Figures 12 to 14In another embodiment, the voice coil 22 has a first protrusion 221 extending to the clearance hole 13, the center magnet 11 has a second protrusion 111 extending to the clearance hole 13, and the first protrusion 221 and the second protrusion 111 are arranged correspondingly. Unlike the above-mentioned embodiment in which the first extension 232 and the second extension 2423 are arranged to utilize the space at the clearance hole 13, in this embodiment, the first protrusion 221 and the second protrusion 111 are arranged to utilize the space at the clearance hole, so that the outer circumference of the center magnet 11 is enlarged, the length of the wire of the voice coil 22 outside the center magnet 11 is lengthened, and the magnetic field strength at the magnetic gap 1a is strengthened, thereby improving the BL value (the product of the magnetic gap magnetic field strength B and the voice coil wire length L) of the loudspeaker 100, so that the loudspeaker 100 has better transient response and higher sensitivity, and the sound is clearer and more natural.

[0122] In addition, the shell 3 includes a first shell 31 and a second shell 32 arranged oppositely in the first direction; the outer circumferential side of the first diaphragm 21 is fixed to the first shell 31, the magnetic circuit system 1 is fixed to the second shell 32, the outer circumferential side of the second folding ring 241 is clamped between the first shell 31 and the second shell 32, the outer circumferential side of the intermediate partition membrane 23 is fixed to the first shell 31, and the second sound hole 7 is formed in the first shell 31. The structural composition of the shell 3 is mainly based on the actual production and assembly requirements, and can be a combination of multiple shell parts or an integrally formed shell. In this embodiment, the shell 3 is divided into the first shell 31 and the second shell 32. Specifically, the magnetic circuit system 1 is fixed to the second shell 32, and the first diaphragm 21 and the intermediate partition membrane 23 are fixed to the first shell 31. In this way, the voice coil 22 connected to the first diaphragm 21 and the second diaphragm 24 connected to the intermediate partition membrane 23 are also fixed to the first shell 31. Therefore, during the assembly and production process, the first diaphragm 21, the voice coil 22, the intermediate partition membrane 23, and the second diaphragm 24 can be easily installed in the first shell 31, and the magnetic circuit system 1 can be easily installed in the second shell 32. Finally, the first shell 31 and the second shell 32 are closed, the second folding ring 241 is clamped and fixed when the first shell 31 and the second shell 32 are closed, and the assembly of the entire structure of the loudspeaker 100 is completed, which facilitates the assembly operation.

[0123] Further, the first shell 31 comprises a main body section 311 and a bending section 312, the main body section 311 is annularly arranged; the bending section 312 is located at one end of the main body section 311 away from the second shell 32 and extends towards the inner side of the main body section 311, the outer periphery of the first diaphragm 21 and the outer periphery of the middle partition membrane 23 are fixed on both sides of the end of the bending section 312 away from the main body section 311; wherein the second sound hole 7 is arranged on the main body section 311 or the bending section 312. In order to meet the relative size requirements of the middle partition membrane 23 and the second diaphragm 24, the bending section 312 is arranged at one end of the main body section 311 in this embodiment, so that the fixed point of the middle partition membrane 23 extends inwardly relative to the second diaphragm 24 to meet the structural size requirements. On this basis, the second sound hole 7 communicating with the second sound cavity 6a can be arranged on the main body section 311 or the bending section 312, and the specific arrangement position is mainly based on the actual use requirements of the loudspeaker 100, which is not limited here.

[0124] Further, in one embodiment of the specific position of the second sound hole 7, the second sound hole 7 is arranged on the main body section 311, and correspondingly, the outer periphery of the first diaphragm 21 and the outer periphery of the middle partition membrane 23 are fixed on both sides of the end of the bending section 312 away from the main body section 311 or the outer periphery of the middle partition membrane 23 is clamped between the outer periphery of the first diaphragm 21 and the bending section 312.

[0125] In addition, in another embodiment of the specific position of the second sound hole 7, the second sound hole 7 is arranged on the bending section 312, and the first shell 31 further comprises a connecting frame 313 connected to the end of the bending section 312 away from the main body section 311, the outer periphery of the first diaphragm 21 is connected to one end of the connecting frame 313, and the outer periphery of the middle partition membrane 23 is connected to the other end of the connecting frame 313 or the bending section 312.

[0126] In addition, the outer periphery of the first diaphragm 21 is provided with a first flange connected to the first shell 31, and the outer periphery of the second diaphragm 24 is provided with a second flange connected to the first shell 31. In this way, the contact area of the first diaphragm 21 and the first shell 31 is increased by the first flange, and the contact area of the second diaphragm 24 and the first shell 31 is increased by the second flange, so as to improve the connection stability and the waterproof ability.

[0127] Further, please refer to Figures 6 to 8The loudspeaker 100 further comprises an elastic support 8, which comprises an outer fixed part 81, an inner fixed part 82, and an elastic arm 83. The outer fixed part 81 and the outer circumferential side of the second diaphragm 24 are clamped between the first shell 31 and the second shell 32, and the outer circumferential side of the outer fixed part 81 is provided with a first electrical connection part 811 extending out of the shell 3. The inner fixed part 82 supports the second vibrating plate 242 and the voice coil 22, and is provided with a second electrical connection part 821 electrically connected to the voice coil 22. The elastic arm 83 connects the outer fixed part 81 and the inner fixed part 82. The specific structure of the elastic support 8 has been described in detail above, and will not be described again here. Based on the above description, the voice coil 22 and the second diaphragm 24 are fixed to the first shell 31, so the elastic support 8 connected to the voice coil 22 and the second diaphragm 24 should also be preferentially fixed to the first shell 31, and then covered with the second shell 32 to complete the assembly of the loudspeaker 100. At this time, based on the structural arrangement that the second diaphragm 24 is located between the first shell 31 and the second shell 32, the first electrical connection part 811 on the outer fixed part 81 of the elastic support 8 needs to be arranged to extend out of the shell 3. Therefore, in this embodiment, the outer fixed part 81 is arranged to be clamped between the second diaphragm 24 and the second shell 32, so as to facilitate the arrangement of the first electrical connection part 811.

[0128] In addition, the magnetic circuit system 1 comprises a magnetic yoke 14, a center magnet 11, and a peripheral magnet 12, which is arranged on the magnetic yoke 14 and located at the periphery of the center magnet 11, and a magnetic gap 1a is defined between the peripheral magnet 12 and the center magnet 11. The first shell 31 and the second shell 32 are metal shells, the magnetic yoke 14 and the second shell 32 are integrally formed, and the first shell 31 and the second shell 32 are weldedly connected. Alternatively, the first shell 31 is a metal shell, and the magnetic yoke 14 and the first shell 31 are weldedly connected. It can be understood that the magnetic yoke 14 can be part of the shell 3, or can be arranged independently of the shell 3, as long as it can block the magnetic field. Therefore, in some embodiments of the present application, the magnetic yoke 14 can be integrally formed with the second shell 32, and then connected with the first shell 31 to achieve the installation of the magnetic yoke 14. In another embodiment of the present application, the magnetic yoke 14 can be weldedly connected with the first shell 31 to form a complete shell 3, i.e., the magnetic yoke 14 serves as the second shell 32, and is combined with the first shell 31 to form the shell 3. The specific arrangement mode is mainly based on actual needs, and is not specifically limited here. In addition, in the embodiment in which the magnetic yoke 14 serves as the second shell 32, the magnetic yoke 14 has a welding protrusion extending towards the first shell 31; alternatively, the first shell 31 has a welding protrusion extending towards the magnetic yoke 14; or the welding connection between the first shell 31 and the magnetic yoke 14 is achieved by a welding sheet, as long as the magnetic yoke 14 and the first shell 31 can be stably connected, which is not specifically limited here.

[0129] In addition, the rigid connecting piece 25 is connected to the end of the voice coil 22 away from the first diaphragm 21. The rigid connecting piece 25 and the elastic support 8 described above are both structures connecting the voice coil 22 and the second diaphragm 24, and on this basis, the connection points of the two with the voice coil 22 can actually not be limited, and can only be connected to the lateral side of the voice coil 22, but if so, the rigid connecting piece 25 and the elastic support 8 will occupy the width of the magnetic gap 1a and affect the magnetic field acting on the voice coil 22 in the magnetic gap 1a, so as to affect the vibration performance of the voice coil 22, and further affect the sound production performance of the loudspeaker 100. Therefore, in the embodiment, the rigid connecting piece 25 and the elastic support 8 are arranged at the end of the voice coil 22 away from the first diaphragm 21, so as to avoid the rigid connecting piece 25 and the elastic support 8 being arranged at the lateral side of the voice coil 22 to occupy the width of the magnetic gap 1a and affect the magnetic field acting on the voice coil 22 in the magnetic gap 1a.

[0130] In addition, referring to Figures 1 to 5 and Figure 18 , the magnetic circuit system 1 includes the yoke 14, the center magnet 11, and the peripheral magnet 12. The center magnet 11 is arranged on the yoke 14. The peripheral magnet 12 is arranged on the yoke 14 and located at the periphery of the center magnet 11, and the magnetic gap 1a is defined between the peripheral magnet 12 and the center magnet 11. The yoke 14 is provided with a relief groove 141 corresponding to the position of the rigid connecting piece 25. Generally, the magnetic circuit system 1 will be matched with the yoke 14, especially for the magnetic circuit system 1 in small and compact electronic products, so as to avoid the exposure of the magnetic field affecting the normal work of external electronic components. In the embodiment, the yoke 14 is arranged at the end of the center magnet 11 away from the first diaphragm 21, that is, the center magnet 11 and the peripheral magnet 12 are both fixed on the yoke 14. On this basis, since the rigid connecting piece 25 is fixed at the end of the voice coil 22 away from the first diaphragm 21, when the voice coil 22 vibrates, the rigid connecting piece 25 has an active stroke close to the yoke 14. In the embodiment, in order to further reduce the height size of the loudspeaker 100, the relief groove 141 is arranged on the yoke 14 to avoid the rigid connecting piece 25, so as to reduce the distance between the end face of the yoke 14 and the lower end of the rigid connecting piece 25, and further reduce the height size of the loudspeaker 100. It should be noted here that based on the structure of the second shell 32 described above, the yoke 14 can be fixed inside the second shell 32, or the second shell 32 can be arranged in a ring shape to be fixed around the yoke 14, and the yoke 14 is used to complete the closure of one end of the loudspeaker 100. In this way, the structure is simplified and the cost is reduced.

[0131] Further, referring to Figure 5The avoiding groove 141 is a through hole penetrating the magnetic yoke 14. On one hand, the avoiding groove 141 is provided in the magnetic yoke 14 to provide the maximum avoiding size for the rigid connecting piece 25, so as to reduce the height of the loudspeaker 100 as much as possible, and meet the structural requirements of the present application. On the other hand, the avoiding groove 141 penetrates the magnetic yoke 14, so that the rear sound cavity defined by the first diaphragm 21 and the intermediate diaphragm 23 and the rear sound cavity defined by the second diaphragm 24 and the magnetic yoke 14 are in communication with the outside, avoiding the rear sound cavity being closed, and thus avoiding the gas in the rear sound cavity hindering the movement of the first diaphragm 21, the second diaphragm 24 and the intermediate diaphragm 23 when the voice coil 22 drives the first diaphragm 21, the second diaphragm 24 and the intermediate diaphragm 23 to vibrate, so as to avoid affecting the performance of the loudspeaker 100. It should be noted that a hole is usually provided in the shell 3 to communicate with the rear sound cavity, and in the present embodiment, the avoiding groove 141 penetrating the magnetic yoke 14 is directly used to simplify the structure of the loudspeaker 100.

[0132] In addition, referring to Figures 1 to 4 and Figure 18 , the first diaphragm 21 comprises a first folding ring 211 and a first vibration plate 212, the outer circumferential side of the first folding ring 211 is connected with the shell 3, and the inner circumferential side of the first folding ring 211 is connected with the first vibration plate 212; the first vibration plate 212 is integrally provided with a protruding portion connected with the voice coil 22; or the end portion of the voice coil 22 is fixed with a connecting plate 9, and the connecting plate 9 connects the voice coil 22 and the first vibration plate 212. The connection mode of the first diaphragm 21 and the voice coil 22 can not be limited, that is, the first diaphragm 21 can be directly connected with the voice coil 22, or the connection can be made through the connecting plate 9. Actually, the structure size of the first diaphragm 21 and the distance between the first diaphragm 21 and the voice coil 22 are mainly considered, and the first diaphragm 21 can be connected to the voice coil 22.

[0133] In addition, the bending portion 2422 comprises an inclined segment 2422a arranged at an angle with the first direction, and the inclined segment 2422a is connected with the main body portion 2421. The second vibration plate 242 is intended to be connected with the rigid connecting piece 25 while being bent towards the first diaphragm 21 to be connected with the intermediate diaphragm 23, so the specific structure of the bending portion 2422 is not limited here, and the bending portion 2422 can be bent to extend towards the first diaphragm 21 and be connected with the intermediate diaphragm 23. In the present embodiment, the inclined segment 2422a is arranged on the bending portion 2422 to make the second vibration plate 242 form a plurality of bending points, and thus reduce the bending angle of a single bending point, so as to facilitate the structure forming of the second vibration plate 242. In addition, the inclined segment 2422a can also improve the rigidity of the second vibration plate 242 in the horizontal direction (i.e. perpendicular to the vibration direction of the vibration system), and thus improve the vibration performance of the second diaphragm 24, and improve the feasibility of the structure forming of the second vibration plate 242. In addition, the inclined segment 2422a facilitates the positioning and connection of the second vibration plate 242 and the second folding ring 241, so as to improve the connection precision.

[0134] Further, please refer to Figures 13 to 14 The magnetic circuit system 1 has an extension corresponding to the inclined section 2422a, and the outer edge of the extension is farther away from the inclined section 2422a in the first direction than the amplitude of the second diaphragm. The inclined section 2422a is farther away from the magnetic circuit system 1 relative to the inner edge of the second diaphragm 242. Based on this, the magnetic circuit system 1 can be provided with an extension at a position corresponding to the inclined section 2422a. On the premise that the outer edge of the extension is farther away from the inclined section 2422a in the first direction than the amplitude of the second diaphragm 242, the extension causes the outer edge of the magnetic circuit system 1 to be outwardly inclined and extended, thereby increasing the size of the magnetic circuit system 1, further improving the BL value of the loudspeaker 100, and improving the sound production effect of the loudspeaker 100.

[0135] In addition, the outer shell 3 and the first side of the first diaphragm 21 define a first sound outlet space 4a, and the outer shell 3 is provided with a first sound outlet hole 5 communicating with the first sound outlet space 4a; or the outer shell 3 and the first side of the first diaphragm 21 are provided with an open end. It can be understood that the first diaphragm 21 can be located at the end of the outer shell 3, i.e., the outer shell 3 is provided with an open end, so that when the loudspeaker 100 is applied to other equipment, the first sound outlet space 4a is defined by the other equipment and the outer shell 3, so that the first diaphragm 21 and the outer shell 3 do not need to be enclosed to define the first sound outlet space 4a, thereby simplifying the structure. On the contrary, the first diaphragm 21 can also be installed in the outer shell 3, so that the first diaphragm 21 and the outer shell 3 define the first sound outlet space 4a. The above two setting modes can meet the sound production function requirements of the loudspeaker 100. The actual use scene and use demand of the loudspeaker 100 are the main consideration, and specific limitations are not made here.

[0136] In addition, please refer to Figures 21 to 16 and Figures 19 to 20 On the basis of the structure embodiment in which the outer shell 3 and the first side of the first diaphragm 21 are provided with an open end, the application further provides an embodiment, i.e., the loudspeaker 100 further comprises a shell cover 10, which is arranged on the open end of the outer shell 3, so as to define a first sound outlet space 4a between the first side of the first diaphragm 21 and the shell cover 10, and the shell cover 10 is provided with a first sound outlet hole 5 communicating with the first sound outlet space 4a.

[0137] In addition, the first sound outlet hole 5 is opposite to and communicates with the second sound outlet hole 7, and the sound waves of the second sound cavity 6a are radiated to the outside through the second sound outlet hole 7 and the first sound outlet hole 5; or the second sound outlet hole 7 is arranged at a position of the shell 3 corresponding to the first sound space 4a, so as to communicate the first sound space 4a with the second sound cavity 6a. Based on the structure of the loudspeaker 100 proposed in the present application, the double-cavity structure of the first sound space 4a and the second sound cavity 6a is formed, so that the first sound outlet hole 5 corresponding to the first sound space 4a and the second sound outlet hole 7 corresponding to the second sound cavity 6a can be arranged oppositely or independently, and the actual structure requirement is the main. Specifically, when the first sound outlet hole 5 and the second sound outlet hole 7 are arranged oppositely, the first sound space 4a and the second sound cavity 6a are arranged independently, and the sound waves of the second sound cavity 6a are radiated to the outside through the second sound outlet hole 7 and the first sound outlet hole 5; when the first sound outlet hole 5 and the second sound outlet hole 7 are arranged independently, the second sound outlet hole 7 is arranged corresponding to the first sound space 4a, and the sound waves of the second sound cavity 6a are radiated to the outside through the second sound outlet hole 7, the first sound space 4a and the first sound outlet hole 7.

[0138] Please refer to Figure 17 and Figure 21 The present application also proposes an electronic device 1000, wherein the electronic device 1000 comprises a cavity 200 and a loudspeaker 100, the cavity 200 is provided with an electronic device sound outlet hole 201; the specific structure of the loudspeaker 100 is referred to the above-mentioned embodiments. Since the electronic device 1000 adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here. The first sound space 4a and the second sound cavity 6a both communicate with the electronic device sound outlet hole 201.

[0139] Specifically, the first diaphragm 21 and the intermediate partition membrane 23 define a first rear sound cavity 4b, the second diaphragm 24 defines a second rear sound cavity 6b on the side away from the intermediate partition membrane 23, the first rear sound cavity 4b and the second rear sound cavity 6b communicate, the loudspeaker 100 is provided with a rear sound passage 101, the first rear sound cavity 4b and the second rear sound cavity 6b communicate with the cavity 200 through the rear sound passage 101, and the effective volume of the cavity 200 is greater than or equal to 2.5cc.

[0140] In the electronic device of the present application, the back sound cavities (the first back sound cavity 4b and the second back sound cavity 6b) of the loudspeaker 100 are connected with the cavity 200 of the electronic device through the back sound passage 101, the space of the back sound cavities of the loudspeaker 100 is expanded by the cavity 200 of the electronic device, which is beneficial to the diffusion of sound waves, reduces the reaction force of the air in the back sound cavities compressed by the vibration system 2 in the process of vibration in the case of the increase of effective vibration area, so that large amplitude vibration of the vibration system 2 can be realized, and the sound quality of the loudspeaker 100 is improved; and the large volume of the cavity 200 can provide better heat dissipation space, which helps to reduce the temperature of the loudspeaker 100, thereby improving its stability and service life.

[0141] Based on the specific structure of the loudspeaker 100 described above, the first back sound cavity 4b and the second back sound cavity 6b are connected, and the back sound passage 101 can be arranged on the shell 3 or the magnetic circuit system 1 of the loudspeaker 100. When the back sound passage 101 is arranged on the magnetic circuit system 1, the back sound passage 101 is a through hole penetrating the magnetic yoke 14, of course, other ways can also be used to connect the back sound cavities with the cavity 200, which is not specifically limited here. Based on this, in order to avoid the non-flowing air in the closed cavity 200 connected with the first back sound cavity 4b and the second back sound cavity 6b to hinder the vibration and sound emission of the loudspeaker 100 when it emits sound, the effective volume of the cavity 200 is set to be not less than 2.5cc to reduce or even eliminate the influence, so as to meet the sound emission performance of the electronic device 1000.

[0142] The above is only an exemplary embodiment of the present application, and does not limit the patent scope of the present application, any equivalent structural transformation made by using the contents of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A loudspeaker, characterized by The loudspeaker comprises a housing, a magnetic circuit system connected to the housing and having a magnetic gap, and a vibration system comprising: a first diaphragm having a first side and a second side in a first direction, an outer periphery of the first diaphragm being connected to the housing, the first side of the first diaphragm being a first sound radiation space; a voice coil disposed on the second side of the first diaphragm and connected to the first diaphragm, the voice coil being at least partially disposed in the magnetic gap; an intermediate partition membrane disposed annularly on the second side of the first diaphragm, an outer periphery of the intermediate partition membrane being connected to the housing; a second diaphragm disposed annularly on a side of the intermediate partition membrane away from the first diaphragm, the second diaphragm comprising a second folded ring and a second vibrating plate, an outer periphery of the second folded ring being connected to the housing, the second vibrating plate comprising a main body connected to an inner periphery of the second folded ring, and a bending portion connected to an inner periphery of the intermediate partition membrane, a second sound radiation cavity being defined between the intermediate partition membrane and the second diaphragm, a second sound radiation hole being formed in the housing and communicating with the second sound radiation cavity; and a rigid connecting member connected between the second diaphragm and the voice coil.

2. The loudspeaker of claim 1, wherein The intermediate partition membrane is a flexible member, and comprises an outer connecting portion connected to the housing, a bending portion, and an inner connecting portion connected to the bending portion.

3. The loudspeaker of claim 1, wherein An effective vibration area of the intermediate partition membrane is less than an effective vibration area of the second diaphragm; and / or In a projection along the first direction, a width of the bending portion of the intermediate partition membrane is greater than or equal to a width of the bending portion of the second folded ring; and / or The first diaphragm comprises a first folded ring and a first vibrating plate, an outer edge of the first folded ring being connected to the housing, and an inner edge of the first folded ring being connected to the first vibrating plate, the second folded ring and the first folded ring both having a flexibility less than a flexibility of the intermediate partition membrane.

4. The loudspeaker of claim 1, wherein An effective vibration area of the intermediate partition membrane is less than an effective vibration area of the second diaphragm, a ratio of the effective vibration area of the intermediate partition membrane to the effective vibration area of the second diaphragm being A, 1:3≤A≤1:1.5; and / or In a projection along the first direction, a width of the bending portion of the intermediate partition membrane is greater than or equal to a width of the bending portion of the second folded ring, a ratio of the width of the bending portion of the intermediate partition membrane to the width of the bending portion of the second folded ring being B, 1:1≤B≤3:

1.

5. The loudspeaker of claim 1, wherein The bending portion of the intermediate partition membrane is disposed protruding towards the second diaphragm, the bending portion of the second folded ring is disposed protruding towards the first diaphragm, the bending portion of the intermediate partition membrane and the bending portion of the second folded ring are disposed in a second direction different from the first direction.

6. The loudspeaker of claim 5, 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 shell, an inner edge of the first folded ring is connected with the first vibrating plate, and a deformation part of the first folded ring is arranged protruding towards the middle partition film, and the deformation part of the first folded ring is arranged corresponding to the deformation part of the middle partition film.

7. The loudspeaker of claim 1, wherein The loudspeaker further comprises an elastic support, the elastic support comprises an outer fixed part, an inner fixed part and an elastic arm connecting the outer fixed part and the inner fixed part, the outer fixed part is connected with the shell, and a first electrical connection part is arranged on the outer fixed part, the inner fixed part supports a second vibrating plate and a voice coil, and a second electrical connection part electrically connected with the voice coil is arranged on the inner fixed part.

8. The loudspeaker of claim 7, wherein, The outer fixed part is arranged in a ring shape, the inner fixed part is arranged on the inner side of the outer fixed part and is connected with the inner side of the outer fixed part through the elastic arm; and / or, The outer fixed part is arranged in a ring shape, and the first electrical connection part is arranged on the outer periphery of the outer fixed part; and / or, The outer fixed part is arranged in a ring shape, the outer fixed part has alternating short axis sides and long axis sides, the elastic arm is led out from one side of the short axis side of the inner fixed part, is bent and then extends along the long axis side, and the elastic arm is connected to the central region of the long axis side; and / or, The inner fixed part comprises a body part and an extension part extending from the body part towards the voice coil, the body part is connected with the second vibrating plate, the extension part is connected with the voice coil, and the second electrical connection part is arranged on the extension part or the body part.

9. The loudspeaker of claim 7, wherein, The rigid connecting piece is connected to the side of the inner fixed part opposite to the second vibrating diaphragm.

10. A loudspeaker as claimed in any one of claims 7 to 9, characterised in that, The magnetic circuit system comprises: a center magnet; and a peripheral magnet arranged at the periphery of the center magnet and defining the magnetic gap with the center magnet; wherein the peripheral magnet is provided with a clearance hole for the elastic support and the rigid connecting piece to pass through.

11. The loudspeaker of claim 10, wherein, The middle partition film has a first extension part extending to the clearance hole, the second vibrating plate has a second extension part extending to the clearance hole, and the first extension part and the second extension part are connected correspondingly; or The voice coil has a first protruding part extending to the clearance hole, the center magnet has a second protruding part extending to the clearance hole, and the first protruding part and the second protruding part are arranged correspondingly.

12. The loudspeaker of claim 1, wherein The shell comprises a first shell and a second shell arranged oppositely in a first direction; the outer periphery of the first vibrating diaphragm is fixed to the first shell, the magnetic circuit system is fixed to the second shell, the outer periphery of the second folded ring is clamped between the first shell and the second shell, the outer periphery of the middle partition film is fixed to the first shell, and the second sound outlet is arranged in the first shell.

13. The loudspeaker of claim 12, wherein, The first shell comprises: a main body segment arranged in a ring shape; and a bent segment located at one end of the main body segment away from the second shell and extending towards the inner side of the main body segment, and the outer periphery of the first vibrating diaphragm and the outer periphery of the middle partition film are fixed to one end of the bent segment away from the main body segment. The second sound outlet hole is arranged on the main body section or the bending section.

14. The loudspeaker of claim 13, wherein, The second sound outlet hole is arranged on the main body section, and the outer periphery of the first diaphragm and the outer periphery of the intermediate diaphragm are fixed on both sides of the end of the bending section away from the main body section, or the outer periphery of the intermediate diaphragm is clamped between the outer periphery of the first diaphragm and the bending section. The second sound outlet hole is arranged on the bending section, and the first shell further comprises a connecting frame connected to the end of the bending section away from the main body section, the outer periphery of the first diaphragm is connected to one end of the connecting frame, and the outer periphery of the intermediate diaphragm is connected to the other end of the connecting frame or the bending section.

15. The loudspeaker of claim 12, wherein, The outer periphery of the first diaphragm is provided with a first flange connected to the first shell; and / or the outer periphery of the second diaphragm is provided with a second flange connected to the first shell.

16. The loudspeaker of claim 12, wherein, The loudspeaker further comprises an elastic support, which comprises: an outer fixing part clamped between the first shell and the second shell and provided with a first electrical connection part protruding from the outer shell; an inner fixing part supporting the voice coil and provided with a second electrical connection part electrically connected to the voice coil; and a resilient arm connecting the outer fixing part and the inner fixing part. The magnetic circuit system comprises:

17. The loudspeaker of claim 12, wherein a magnetic yoke; a center magnet arranged on the magnetic yoke; and a peripheral magnet arranged on the magnetic yoke and located at the periphery of the center magnet, and the magnetic gap is defined between the peripheral magnet and the center magnet; wherein the first shell and the second shell are metal shells, the magnetic yoke and the second shell are integrally formed, and the first shell and the second shell are welded; or the first shell is a metal shell, and the magnetic yoke and the first shell are welded. The rigid connecting part connects one end of the voice coil away from the first diaphragm.

18. The loudspeaker of claim 1, wherein The magnetic circuit system comprises:

19. The loudspeaker of claim 18, wherein, a magnetic yoke; a center magnet arranged on the magnetic yoke; and a peripheral magnet arranged on the magnetic yoke and located at the periphery of the center magnet, and the magnetic gap is defined between the peripheral magnet and the center magnet; wherein the magnetic yoke is provided with a relief groove corresponding to the position of the rigid connecting part. The relief groove is a through hole penetrating through the magnetic yoke.

20. The loudspeaker of claim 19, wherein, The first diaphragm comprises a first folded ring and a first vibration plate, the outer periphery of the first folded ring is connected to the outer shell, and the inner periphery of the first folded ring is connected to the first vibration plate.

21. The loudspeaker of claim 1, wherein, The first vibration plate is integrally provided with a protruding part connected to the voice coil; or the end of the voice coil is fixed with a connecting plate connected to the first vibration plate. The bending part comprises an inclined section arranged at an angle to the first direction, and the inclined section is connected to the main body part.

22. The loudspeaker of claim 1, wherein, The magnetic circuit system has an extension part corresponding to the inclined section, and the distance between the outer edge of the extension part and the inclined section in the first direction is greater than the amplitude of the second vibration plate.

23. The loudspeaker of claim 22, wherein, The magnetic circuit system comprises: a magnetic yoke; a center magnet arranged on the magnetic yoke; and a peripheral magnet arranged on the magnetic yoke and located at the periphery of the center magnet, and the magnetic gap is defined between the peripheral magnet and the center magnet; wherein the first shell and the second shell are metal shells, the magnetic yoke and the second shell are integrally formed, and the first shell and the second shell are welded; or the first shell is a metal shell, and the magnetic yoke and the first shell are welded. The rigid connecting part connects one end of the voice coil away from the first diaphragm. The magnetic circuit system comprises: a magnetic yoke; a center magnet arranged on the magnetic yoke; and a peripheral magnet arranged on the magnetic yoke and located at the periphery of the center magnet, and the magnetic gap is defined between the peripheral magnet and the center magnet; wherein the magnetic yoke is provided with a relief groove corresponding to the position of the rigid connecting part. The relief groove is a through hole penetrating through the magnetic yoke. The first diaphragm comprises a first folded ring and a first vibration plate, the outer periphery of the first folded ring is connected to the outer shell, and the inner periphery of the first folded ring is connected to the first vibration plate. The first vibration plate is integrally provided with a protruding part connected to the voice coil; or the end of the voice coil is fixed with a connecting plate connected to the first vibration plate. The bending part comprises an inclined section arranged at an angle to the first direction, and the inclined section is connected to the main body part. The magnetic circuit system has an extension part corresponding to the inclined section, and the distance between the outer edge of the extension part and the inclined section in the first direction is greater than the amplitude of the second vibration plate.

24. The loudspeaker of claim 1, wherein, The first sound outlet hole is opposite to and communicates with the second sound outlet hole, and sound waves of the second sound cavity are radiated to the outside world through the second sound outlet hole and the first sound outlet hole. The first sound outlet hole is opposite to and communicates with the second sound outlet hole, and sound waves of the second sound cavity are radiated to the outside world through the second sound outlet hole and the first sound outlet hole.

25. The loudspeaker of claim 1, wherein, The first sound outlet hole is opposite to and communicates with the second sound outlet hole, and sound waves of the second sound cavity are radiated to the outside world through the second sound outlet hole and the first sound outlet hole.

26. The loudspeaker of claim 25, wherein, The first sound outlet hole is opposite to and communicates with the second sound outlet hole, and sound waves of the second sound cavity are radiated to the outside world through the second sound outlet hole and the first sound outlet hole. The first sound outlet hole is opposite to and communicates with the second sound outlet hole, and sound waves of the second sound cavity are radiated to the outside world through the second sound outlet hole and the first sound outlet hole.

27. An electronic device, comprising: The first sound outlet hole is opposite to and communicates with the second sound outlet hole, and sound waves of the second sound cavity are radiated to the outside world through the second sound outlet hole and the first sound outlet hole. The first sound outlet hole is opposite to and communicates with the second sound outlet hole, and sound waves of the second sound cavity are radiated to the outside world through the second sound outlet hole and the first sound outlet hole. The first sound outlet hole is opposite to and communicates with the second sound outlet hole, and sound waves of the second sound cavity are radiated to the outside world through the second sound outlet hole and the first sound outlet hole. The first sound outlet hole is opposite to and communicates with the second sound outlet hole, and sound waves of the second sound cavity are radiated to the outside world through the second sound outlet hole and the first sound outlet hole.

28. The electronic device of claim 27, wherein, The first sound outlet hole is opposite to and communicates with the second sound outlet hole, and sound waves of the second sound cavity are radiated to the outside world through the second sound outlet hole and the first sound outlet hole. The first sound outlet hole is opposite to and communicates with the second sound outlet hole, and sound waves of the second sound cavity are radiated to the outside world through the second sound outlet hole and the first sound outlet hole. The first sound outlet hole is opposite to and communicates with the second sound outlet hole, and sound waves of the second sound cavity are radiated to the outside world through the second sound outlet hole and the first sound outlet hole. The first sound outlet hole is opposite to and communicates with the second sound outlet hole, and sound waves of the second sound cavity are radiated to the outside world through the second sound outlet hole and the first sound outlet hole. The first sound outlet hole is opposite to and communicates with the second sound outlet hole, and sound waves of the second sound cavity are radiated to the outside world through the second sound outlet hole and the first sound outlet hole. The first sound outlet hole is opposite to and communicates with the second sound outlet hole, and sound waves of the second sound cavity are radiated to the outside world through the second sound outlet hole and the first sound outlet hole. The first sound outlet hole is opposite to and communicates with the second sound outlet hole, and sound waves of the second sound cavity are radiated to the outside world through the second sound outlet hole and the first sound outlet hole. The first sound outlet hole is opposite to and communicates with the second sound outlet hole, and sound waves of the second sound cavity are radiated to the outside world through the second sound outlet hole and the first sound outlet hole. The first sound outlet hole is opposite to and communicates with the second sound outlet hole, and sound waves of the second sound cavity are radiated to the outside world through the second sound outlet hole and the first sound outlet hole. The first sound outlet hole is opposite to and communicates with the second sound outlet hole, and sound waves of the second sound cavity are radiated to the outside world through the second sound outlet hole and the first sound outlet hole. The first sound outlet hole is opposite to and communicates with the second sound outlet hole, and sound waves of the second sound cavity are radiated to the outside world through the second sound outlet hole and the first sound outlet hole. The first sound outlet hole is opposite to and communicates with the second sound outlet hole, and sound waves

Images