Diaphragm and receiver using the same

Abstract

The present invention provides a diaphragm and a receiver adopting the diaphragm. The diaphragm includes: a fixed frame having an inner cavity penetrating in the thickness direction of the fixed frame; a reed, whose hinged end is connected to the fixed frame and whose vibrating end is suspended in the fixed frame; a vibrating plate fixedly connected to the vibrating end of the reed, the vibrating plate being suspended in the fixed frame, and a predetermined gap being formed between the vibrating plate and the fixed frame. Compared with the prior art, the diaphragm in the present invention can improve the high-frequency response while ensuring high air agitation efficiency, thereby being beneficial to improving the overall quality performance of the receiver.

Description

Technical Field

[0001] The present invention belongs to the technical field of electro-acoustic conversion, and particularly relates to a diaphragm design and a direct-drive balanced armature receiver using the diaphragm.

Background Art

[0002] A receiver, also called a handset, is an electro-acoustic device that converts an audio electrical signal into a sound signal under the condition of no sound leakage, and is widely used in communication terminal devices such as mobile phones, fixed telephones, and hearing aids to achieve audio output.

[0003] Please refer to Figure 1 shown, which is a schematic structural diagram of a diaphragm 100 of an existing direct-drive balanced armature receiver in an embodiment; please refer to Figure 2 shown, which is Figure 1 an exploded view of the diaphragm shown. Figure 1 and Figure 2 The diaphragm shown is composed of three components, namely a fixed frame 110, a vibrating plate 120, and a film 130. Among them, the vibrating plate 120, as a vibrating component, has the functions of guiding magnetism and agitating air at the same time. In order to make the vibrating plate 120 more efficient in agitating air, it is necessary to maximize the area of the vibrating plate 120. However, the increase in the area of the vibrating plate 120 brings an increase in mass, resulting in a deterioration of the high-frequency response. It is impossible to take into account both the efficiency of agitating air and the high-frequency response at the same time, which brings great limitations to the performance of the receiver.

[0004] Therefore, it is necessary to propose an improved technical solution to overcome the above problems.

Summary of the Invention

[0005] The purpose of the present invention is to provide a diaphragm and a direct-drive balanced armature receiver using the diaphragm. The diaphragm can improve the high-frequency response while ensuring high efficiency of agitating air, thereby being beneficial to improving the overall performance of the receiver.

[0006] According to one aspect of the present invention, the present invention provides a diaphragm, which includes: a fixed frame having an inner cavity penetrating in the thickness direction of the fixed frame; a reed, whose hinge end is connected to the fixed frame and whose vibrating end is suspended in the fixed frame; a vibrating plate fixedly connected to the vibrating end of the reed, the vibrating plate being suspended in the fixed frame, and a predetermined gap being formed between the vibrating plate and the fixed frame.

[0007] Furthermore, the reed is used for guiding magnetism and generating a driving force under the drive of a provided electromagnetic driving mechanism; the vibrating plate is used for reciprocating vibration in a direction perpendicular to the vibrating plate under the push of the driving force generated by the reed; the area of the vibrating plate is larger than the area of the vibrating end of the reed.

[0008] Further, the vibrating plate is made of a non-magnetic material with low density, high strength, and light weight; and / or the reed is made of a high magnetic permeability material.

[0009] Further, the non-magnetic material includes aluminum alloy, titanium alloy, carbon fiber, or high-strength plastic.

[0010] Further, based on the light-weight non-magnetic material used, the area of the vibrating plate is maximized; the size of the reed needs to meet the magnetic conduction function and the combined body of the reed and the vibrating plate needs to meet the requirements of strength, stiffness, mass, and mode.

[0011] Further, a first window is opened in the magnet covering area at the vibrating end of the vibrating plate, and the first window penetrates through the thickness direction of the vibrating plate.

[0012] Further, the size of the first window is set to ensure the strength of the vibrating plate; the area of the first window should be greater than or equal to the area of the magnet covering area to ensure that the vibrating plate does not interfere with the magnet during vibration.

[0013] Further, the vibrating plate is attached to one side surface of the vibrating end of the reed, and the vibrating end of the reed covers the first window of the vibrating plate.

[0014] Further, the width of the first window matches the width of the vibrating end of the reed, and the area of the vibrating end of the reed corresponding to the first window of the vibrating plate is embedded in the first window of the vibrating plate; the area of the vibrating end of the reed not corresponding to the first window of the vibrating plate overlaps with the vibrating plate.

[0015] Further, after assembly, the upper surface of the vibrating end of the vibrating plate is flush with the upper surface of the reed.

[0016] Further, the vibrating plate is a stepped vibrating plate, which includes an upper stepped cross plate, a lower stepped cross plate, and a vertical stepped surface. The upper stepped cross plate is transitioned to the lower stepped cross plate through the vertical stepped surface, and the first window is located on the lower stepped cross plate and is adjacent to the vertical stepped surface.

[0017] Further, the vibrating membrane further includes a film, and the film is attached to one side surface of the fixing frame and the vibrating plate and at least seals the predetermined gap formed between the vibrating plate and the fixing frame.

[0018] Further, the reed and the fixing frame are respectively provided with protrusions and grooves for positioning. The protrusion on the reed is arranged at the hinge end, and the reed is combined with the fixing frame at the hinge end of the reed by welding or adhesive.

[0019] Further, a thinning area is provided at the hinge end of the reed, and the thickness of the thinning area is less than the thickness of other areas of the hinge end except the thinning area; the width of the thinning area is greater than the width of the vibrating end of the reed; the cross-sectional area of the thinning area is greater than or equal to the cross-sectional area of the vibrating end of the reed.

[0020] According to another aspect of the present invention, the present invention provides a receiver, which includes: a housing having a hollow inner cavity; a diaphragm disposed in the hollow inner cavity, dividing the hollow inner cavity into a first cavity and a second cavity, wherein the fixing frame is fixed to the inner wall of the housing; an electromagnetic driving mechanism disposed in the hollow inner cavity, which includes at least one of the magnets and at least one coil, the magnet is used to generate a fixed magnetic field, and the coil generates the alternating magnetic field after being energized. The diaphragm includes: a fixing frame having an inner cavity penetrating in the thickness direction of the fixing frame; a reed, whose hinge end is connected to the fixing frame, and whose vibrating end is suspended in the fixing frame; a vibrating plate fixedly connected to the vibrating end of the reed, the vibrating plate is suspended in the fixing frame, and a predetermined gap is formed between the vibrating plate and the fixing frame.

[0021] Compared with the prior art, the present invention splits the vibrating components in the diaphragm into a reed for magnetic conduction and a vibrating plate for agitating air. Among them, the vibrating plate can be made of lightweight materials and maximize the area, and the size of the reed only needs to meet the magnetic conduction function and the combination of the vibrating plate can meet the requirements of strength, stiffness and mode. In this way, the present invention can not only maintain high efficiency in agitating air but also reduce weight and improve high-frequency response, thus being beneficial to improving the overall performance of the receiver.

BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. Among them:

[0023] Figure 1 It is a schematic structural diagram of the diaphragm of an existing direct-drive balanced armature receiver in an embodiment;

[0024] Figure 2 is Figure 1 an exploded schematic diagram of the shown diaphragm;

[0025] Figure 3 It is a schematic structural diagram of the diaphragm of the receiver in the first embodiment of the present invention;

[0026] Figure 4 is Figure 3Explosion schematic diagram of the diaphragm shown;

[0027] Figure 5 is Figure 4 Schematic diagram of the structure after the fixed frame, reed and vibrating plate in [] are assembled together;

[0028] Figure 6 Cross-sectional schematic diagram of the diaphragm of the receiver in the second embodiment of the present invention;

[0029] Figure 7 is Figure 6 Explosion schematic diagram of the diaphragm shown;

[0030] Figure 8 For it is Figure 7 Schematic diagram of the structure after the fixed frame, reed and vibrating plate in [] are assembled together;

[0031] Figure 9 Cross-sectional schematic diagram of the diaphragm of the receiver in the third embodiment of the present invention;

[0032] Figure 10 is Figure 9 Explosion schematic diagram of the diaphragm shown;

[0033] Figure 11 Cross-sectional schematic diagram of a direct-drive balanced armature receiver using the diaphragm design of the present invention in one embodiment.

Detailed implementation manners

[0034] To make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0035] As used herein, "one embodiment" or "embodiment" refers to a specific feature, structure or characteristic that may be included in at least one implementation manner of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. Unless otherwise specified, the words indicating electrical connection such as "connected", "coupled", and "joined" in this article all mean directly or indirectly electrically connected.

[0036] Please refer to Figure 3 shown, which is a schematic diagram of the structure of the diaphragm 200 of the receiver in the first embodiment of the present invention. Please refer to Figure 4 shown, which is Figure 3 Explosion schematic diagram of the diaphragm shown. Figure 3 and Figure 4The diaphragm of the receiver shown includes a fixing frame 210, a reed 220, a vibrating plate 230, and a film 240. During the manufacturing process of the diaphragm designed by the present invention, the fixing frame 210, the reed 220, and the vibrating plate 230 are usually assembled together first, and then the film 240 and the forming track are assembled. Please refer to Figure 5 shown, which is Figure 4 a schematic structural diagram of the fixing frame 210, the reed 220, and the vibrating plate 230 assembled together in

[0037] The fixing frame 210 functions to fix, and it is made of non-magnetic material, which can be non-magnetic metal, or non-metal materials such as plastic, carbon fiber, or ceramic. In Figure 3 - 5 the shown embodiment, the fixing frame 210 has an inner cavity 212 penetrating the thickness direction of the fixing frame 210.

[0038] The reed 220 is made of magnetic material, which is used for magnetic conduction and generates a driving force under the drive of a set electromagnetic driving mechanism (not shown). The reed 220 can be made of high magnetic permeability material. In Figure 3 - 5 the shown embodiment, the hinge end 222 of the reed 220 is connected to the inner side of the fixing frame 210, and its vibrating end 224 is suspended in the inner cavity 212 of the fixing frame 210. In Figure 3 - 5 the specific embodiment shown, except for the hinge end (or hinge area) 222 of the reed 220 connected to the fixing frame 210, other parts are vibrating ends (or vibrating areas) 224.

[0039] The vibrating plate 230 is used to reciprocate in the direction perpendicular to the vibrating plate 230 under the driving force generated by the reed 220, so as to drive the film 240 to agitate the air to make a sound. In Figure 3 - 5 the shown embodiment, the vibrating plate 230 is fixed to the vibrating end 224 of the reed 220, and the vibrating plate 230 is suspended in the inner cavity 212 of the fixing frame 210, wherein the area of the vibrating plate 230 is larger than the area of the vibrating end 224 of the reed 220; a predetermined gap 250 is reserved between the outer surface of the vibrating plate 230 and the inner surface of the fixing frame 210 for the forming track. In one embodiment, the vibrating plate 230 can be made of non-magnetic materials with low density, high strength, and light weight, which can be non-metal materials such as aluminum alloy, titanium alloy, carbon fiber, or high-strength plastic.

[0040] In one embodiment, the vibrating plate 230 can be fixed to the vibrating end 224 of the reed 220 by welding or an adhesive. In one embodiment, in order to further reduce the weight and provide sufficient movement space, a first window 232 is formed in the magnet covering area at the vibrating end of the vibrating plate 230. The first window 232 penetrates the thickness direction of the vibrating plate 230, and the first window 232 can prevent the vibrating plate 230 from interfering with the magnet when large displacements occur. The magnet covering area is the area corresponding to the magnet (not shown) in the provided electromagnetic driving mechanism on the vibrating plate 230 (or the projection of the magnet on the vibrating plate 230).

[0041] In one embodiment, the first window 232 is set as small as possible to ensure the strength of the vibrating plate 230, and the minimum size is larger than the magnet to ensure that the vibrating plate 230 does not interfere with the magnet during vibration. That is to say, the size of the first window 232 is set to ensure the strength of the vibrating plate 230; the area of the first window 232 should be greater than or equal to the area of the magnet covering area to ensure that the vibrating plate 230 does not interfere with the magnet during vibration.

[0042] In Figure 3 - 5 In the specific embodiment shown, the vibrating plate 230 is attached to one side surface of the vibrating end 224 of the reed 220; the first window 232 is located at the end of the vibrating plate 230 away from the hinge end 222 (i.e., the vibrating end of the vibrating plate 230), and the vibrating end 224 of the reed 220 covers the first window 232 of the vibrating plate 230.

[0043] After the fixed frame 210, the reed 220, and the vibrating plate 230 are assembled together, the film 240 is attached to one side surface of the fixed frame 210 and the vibrating plate 230, and at least seals the predetermined gap 250 formed between the vibrating plate 230 and the fixed frame 210. In one embodiment, the film 240 can be made of a highly elastic stretchable material, such as a PU (Polyurethane) film. In Figure 3 and Figure 4 In the specific embodiment shown, the film 240 is provided with a protrusion 242 facing the predetermined gap 250 at a position corresponding to the predetermined gap 250. Due to the setting of the protrusion 242, when the vibrating plate 230 drives the film 240 to vibrate, the film 240 can vibrate more easily with the vibrating plate 230.

[0044] In one embodiment, the reed 220 and the fixed frame 210 are respectively provided with protrusions and grooves for positioning. In Figure 3 - 5In the specific embodiment shown, the protrusion 226 on the reed 220 is arranged at the hinge end 222, and a groove 212 matching the protrusion 226 is arranged on the inner side of the fixed frame 210. The hinge end 222 of the reed 220 is combined (or connected) with the fixed frame 210 by welding or an adhesive. When the reed 220 and the fixed frame 210 are assembled, the designs of the protrusion 226 and the groove 214 can play a role in self-positioning, thereby simplifying the assembly process and improving the assembly accuracy.

[0045] It should be noted that since the vibrating plate 230 is made of a lightweight material and its area is maximized, and the size of the reed 220 only needs to meet the magnetic conduction function and the combination of the vibrating plate 230 can meet the requirements of strength, stiffness, mass and mode, therefore, the diaphragm design of the present invention improves the high-frequency response while ensuring high air agitation efficiency, which is beneficial to improving the overall product performance.

[0046] As a deformation and improvement of the foregoing design of the present invention, in order to obtain better compliance and a larger output under the same driving force, a thinning design can be performed on a certain area of the hinge end 222 of the reed 220. For details, please refer to Figure 6 - 8 the embodiment shown.

[0047] Please refer to Figure 6 shown, which is a schematic cross-sectional view of the diaphragm of the receiver in the second embodiment of the present invention. Please refer to Figure 7 shown, which is Figure 6 a schematic exploded view of the diaphragm shown. Please refer to Figure 8 shown, which is Figure 7 a schematic structural view of the fixed frame 310, the reed 320 and the vibrating plate 330 assembled together in. In the embodiment shown in FIGS. 6-8, the diaphragm of the receiver includes a fixed frame 310, a reed 320, a vibrating plate 330 and a film 340; the fixed frame 310 has an inner cavity 312 penetrating the thickness direction of the fixed frame 310; the reed 320 includes a hinge end 322 and a vibrating end 324; the vibrating plate 330 is provided with a first window 332; a predetermined gap 350 is reserved between the outer surface of the vibrating plate 330 and the inner surface of the fixed frame 310 for forming a track; the film 340 is provided with a protrusion 342 facing the predetermined gap 350 at a position corresponding to the predetermined gap 350. Figure 6 - 8 The embodiment shown in Figure 3 - 5 Compared with the embodiment shown in, the materials, shapes and relative positional relationships of the components are basically the same, and will not be elaborated here.

[0048] Figure 6 - 8 The embodiment shown in Figure 3 - 5 The main difference between the embodiment shown in and is: Figure 6 - 8In the illustrated embodiment, a thinning design is added to a predetermined area at the hinge end 322 of the reed 320 to form a thinning area 3222. To ensure that the cross-sectional area for magnetic conduction is not affected, the width of the thinning area 3222 is appropriately widened, that is, the cross-sectional area of the thinning area 3222 is not less than the cross-sectional area of the vibrating end 324 of the reed 320. That is to say, the thickness of the thinning area 3222 is less than the thickness of other areas of the hinge end 322 except the thinning area 3222, and the width of the thinning area 3222 is greater than the width of the vibrating end 324 of the reed 220, that is, the cross-sectional area of the thinning area 3222 is greater than or equal to the cross-sectional area of the vibrating end 324 of the reed 320, so that the reed 320 with the thinning area 3222 can ensure that the magnetic conduction bottleneck does not occur in the thinning area while reducing the system stiffness. In addition, the shape of the film 340 is adaptively adjusted for this thinning design.

[0049] Please refer to Figure 9 As shown, it is a schematic cross-sectional view of the diaphragm of the receiver in the third embodiment of the present invention. Please refer to Figure 10 As shown, it is Figure 9 an exploded schematic view of the diaphragm shown. Figure 9 - 10 The main difference between the illustrated embodiment and Figure 6 - 8 the illustrated embodiment is that: a first window 432 is provided in the magnet covering area at the vibrating end of the vibrating plate 430, the width of the first window 432 matches the width of the vibrating end 424 of the reed 420, the vibrating plate 430 adopts a bending design, and after assembly, the area of the vibrating end 424 of the reed 420 corresponding to the first window 432 is embedded in the first window 432 of the vibrating plate 430; the area of the vibrating end 424 of the reed 420 that does not correspond to the first window 432 overlaps with the vibrating plate 430. With such a design, the upper surface of the vibrating plate 430 is flush with the upper surface of the reed 420 at the vibrating end, that is, the thickness will not increase due to the combination of the vibrating plate 430 and the reed 420 in the magnet covering area at the vibrating end of the vibrating plate 430, so that a larger movement space can be obtained when cooperating with a magnet with a larger area. In addition, the shape of the film 440 is adaptively adjusted for the bending design of the vibrating plate 430.

[0050] In Figure 9 - 10 the specific embodiment shown, the vibrating plate 430 is a stepped vibrating plate, which includes an upper stepped cross plate 434, a lower stepped cross plate 436 and a vertical stepped surface 438. The upper stepped cross plate 434 is transitioned to the lower stepped cross plate 436 through the vertical stepped surface 438, and the first window 432 is located on the lower stepped cross plate 436 and is adjacent to the vertical stepped surface 438. After assembly, the upper surface of the lower stepped cross plate 436 is flush with the upper surface of the reed 420.

[0051] According to another aspect of the present invention, the present invention provides a receiver, specifically as Figure 11 shown, which is a schematic cross-sectional view of a direct-drive balanced armature receiver adopting the diaphragm design of the present invention. Figure 11 The receiver shown includes: a housing 510 having a hollow inner cavity (not labeled); a diaphragm 520 as shown in Figure 9 - 10 the third embodiment, the diaphragm 520 is disposed in the hollow inner cavity of the housing 510, separating the hollow inner cavity into a first cavity 512 and a second cavity 514, wherein a fixing frame 522 in the diaphragm 520 is fixed to the inner wall of the housing 510; an electromagnetic driving mechanism (not labeled) disposed in the hollow inner cavity, which includes at least one magnet (530) and at least one coil (540), the magnet 530 is used to generate a fixed magnetic field, and the coil generates the alternating magnetic field after being energized. Figure 11 The basic working principle of the receiver shown is well-known to those skilled in the art, so it will not be elaborated here.

[0052] In summary, in the present invention, the vibrating components in the diaphragm are split into reed pieces 210, 310, 410 for magnetic conduction and vibrating plates 230, 330, 430 for agitating air. Among them, the vibrating plates 230, 330, 430 are made of lightweight materials and the area is maximized. The sizes of the reed pieces 210, 310, 410 only need to meet the magnetic conduction function and the combination of the vibrating plates can meet the requirements of strength, stiffness, mass and mode. Therefore, the receiver in the present invention has the following advantages or beneficial effects:

[0053] (1). The self-positioning design of the reed piece and the fixing frame can simplify the assembly process and improve the assembly accuracy.

[0054] (2). The lightweight and area-maximized vibrating plate design improves the high-frequency response while ensuring high air-agitating efficiency, which is beneficial to improving the overall product performance.

[0055] (3). A thinning design is added to a predetermined area of the hinge end 322 of the reed piece 320, so as to obtain better compliance, which is beneficial to obtaining greater output and higher efficiency.

[0056] In the present invention, words indicating electrical connection such as "connected", "linked", "joined", "connected", etc., unless otherwise specified, mean direct or indirect electrical connection.

[0057] It should be noted that any modification made by those skilled in the art to the specific embodiments of the present invention does not depart from the scope of the claims of the present invention. Correspondingly, the scope of the claims of the present invention is not limited to the foregoing specific embodiments.

Claims

1. A diaphragm, characterized in that, it includes: a fixing frame having an inner cavity penetrating in the thickness direction of the fixing frame; a reed, whose hinge end is connected to the fixing frame and whose vibrating end is suspended in the fixing frame; a vibrating plate fixedly connected to the vibrating end of the reed, the vibrating plate being suspended in the fixing frame, and a predetermined gap being formed between the vibrating plate and the fixing frame, the area of the vibrating plate being larger than the area of the vibrating end of the reed, and the vibrating plate being attached to one side surface of the vibrating end of the reed; a film attached to one side surface of the fixing frame and the vibrating plate and at least sealing the predetermined gap formed between the vibrating plate and the fixing frame, the reed is made of a magnetically conductive material, and the vibrating plate is made of a non-magnetically conductive material.

2. The diaphragm according to claim 1, characterized in that, the reed is used for magnetic conduction and generates a driving force under the drive of a set electromagnetic driving mechanism; the vibrating plate is used for reciprocating vibration in a direction perpendicular to the vibrating plate under the push of the driving force generated by the reed.

3. The diaphragm according to claim 2, characterized in that, the vibrating plate is made of a non-magnetically conductive material with low density, high strength and light weight; and / or the reed is made of a high-magnetically conductive material.

4. The diaphragm according to claim 3, characterized in that, the non-magnetically conductive material includes aluminum alloy, titanium alloy, carbon fiber or high-strength plastic.

5. The diaphragm according to claim 3, characterized in that, based on the lightweight non-magnetically conductive material used for the vibrating plate, its area is maximized; the size of the reed needs to meet the requirements of magnetic conduction function and the combination of the vibrating plate can meet the requirements of strength, stiffness, mass and mode.

6. The diaphragm according to claim 2, characterized in that, a first window is opened in the magnet covering area at the vibrating end of the vibrating plate, the first window penetrates in the thickness direction of the vibrating plate.

7. The diaphragm according to claim 6, characterized in that, the size of the first window is set to ensure the strength of the vibrating plate; the area of the first window should be greater than or equal to the area of the magnet covering area to ensure that the vibrating plate does not interfere with the magnet during the vibration process.

8. The diaphragm according to claim 6, characterized in that, the vibrating end of the reed covers the first window of the vibrating plate.

9. The diaphragm according to claim 6, characterized in that, the width of the first window matches the width of the vibrating end of the reed, the area of the vibrating end of the reed corresponding to the first window of the vibrating plate is embedded in the first window of the vibrating plate; the area of the vibrating end of the reed not corresponding to the first window of the vibrating plate overlaps with the vibrating plate.

10. The diaphragm according to claim 9, characterized in that, after assembly, the upper surface of the vibrating end of the vibrating plate is flush with the upper surface of the reed.

11. The diaphragm according to claim 9, characterized in that, the vibrating plate is a stepped vibrating plate, which includes an upper stepped horizontal plate, a lower stepped horizontal plate and a vertical stepped surface, the upper stepped horizontal plate is transitioned to the lower stepped horizontal plate through the vertical stepped surface, and the first window is located on the lower stepped horizontal plate and is adjacent to the vertical stepped surface.

12. The diaphragm according to claim 1, It is characterized in that the reed and the fixed frame are respectively provided with protrusions and grooves for positioning. The protrusion on the reed is arranged at the hinge end, and the hinge end of the reed is combined with the fixed frame by welding or an adhesive.

13. The diaphragm according to claim 1, It is characterized in that a thinning area is arranged at the hinge end of the reed, the thickness of the thinning area is smaller than the thickness of other areas of the hinge end except the thinning area; the width of the thinning area is larger than the width of the vibrating end of the reed; the cross-sectional area of the thinning area is greater than or equal to the cross-sectional area of the vibrating end of the reed.

14. A receiver, It is characterized in that it includes: a housing having a hollow inner cavity; a diaphragm according to any one of claims 1-13, which is arranged in the hollow inner cavity and divides the hollow inner cavity into a first cavity and a second cavity, wherein the fixed frame is fixed to the inner wall of the housing; an electromagnetic driving mechanism arranged in the hollow inner cavity, which includes at least one magnet and at least one coil, the magnet is used to generate a fixed magnetic field, and the coil generates an alternating magnetic field after being energized.

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