Sound production monomer and electronic equipment

Abstract

The invention belongs to the technical field of acoustic-electric conversion, and discloses a sound production monomer and electronic equipment, and the sound production monomer comprises a shell, at least one first polar structure, at least one second polar structure and a vibrating diaphragm. The first polar structure is arranged on the shell; the second polar structures are arranged on the shell, the first polar structures and the second polar structures are alternately arranged in the first direction, and the first direction is the thickness direction of the shell; the vibrating diaphragm is arranged in the shell, the inner periphery of the vibrating diaphragm is correspondingly connected to the second polar structure, the outer periphery of the vibrating diaphragm is connected to the shell, and the first polar structure and the second polar structure are matched with each other to drive the vibrating diaphragm to vibrate; when one of the first polar structure and the second polar structure includes an electrode layer, the other of the first polar structure and the second polar structure includes an electret layer. The sound production monomer and the electronic equipment provided by the invention meet the requirements of lightness and thinness, and have relatively high low-frequency sensitivity.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of acoustic-electric conversion, and in particular to a sound emitting unit and an electronic device. BACKGROUND

[0002] A moving-coil loudspeaker generally comprises a shell, a magnetic circuit system arranged in the shell, and a vibration system mounted on the shell. The magnetic circuit system comprises a plurality of magnets arranged at intervals to form a magnetic gap. The vibration system comprises a diaphragm and a voice coil, the edge of the diaphragm is connected to the shell, and one end of the voice coil is connected to the diaphragm and the other end is located in the magnetic gap. The voice coil can interact with the magnetic circuit system after being electrified to drive the diaphragm to vibrate and emit sound.

[0003] In the related art, due to the influence of the shell, the magnetic circuit system, the voice coil and other structures, the ratio of the amplitude space of the diaphragm to the total thickness of the loudspeaker is usually small, which leads to a low low-frequency sensitivity of the loudspeaker. If the low-frequency sensitivity is to be improved, multiple moving-coil loudspeakers need to be stacked, resulting in a large thickness of the entire sound emitting structure, which is difficult to apply to electronic devices with high installation space requirements.

[0004] Therefore, there is an urgent need for a light and thin sound emitting unit with high low-frequency sensitivity and an electronic device. SUMMARY

[0005] The first object of the present application is to provide a sound emitting unit to solve the technical problem of low-frequency sensitivity in the prior art.

[0006] The second object of the present application is to provide an electronic device, the sound emitting unit occupies a small space, which is beneficial to the lightness and thinness of the electronic device.

[0007] As conceived above, the technical solution adopted by the present application is:

[0008] The sound emitting unit comprises:

[0009] a shell;

[0010] at least one first polarity structure arranged on the shell;

[0011] at least one second polarity structure arranged on the shell, the first polarity structure and the second polarity structure being arranged alternately along a first direction, the first direction being the thickness direction of the shell;

[0012] a diaphragm arranged in the shell, an inner periphery of the diaphragm being connected to the second polarity structure, an outer periphery of the diaphragm being connected to the shell, the first polarity structure and the second polarity structure cooperating to drive the diaphragm to vibrate;

[0013] One of the first polarity structure and the second polarity structure comprises an electrode layer, and the other one comprises an electret layer.

[0014] In one of the embodiments, the diaphragm comprises a folded ring portion, which protrudes in the first direction.

[0015] In one of the embodiments, the diaphragm is provided with an electrically conductive structure; and / or the diaphragm is an electrically conductive body.

[0016] In one of the embodiments, the housing is provided with mounting holes on the housing walls in the first direction, and the mounting holes are mounted with the first polarity structures.

[0017] In one of the embodiments, two first polarity structures are provided, and the housing is provided with mounting holes on two housing walls in the first direction, the two first polarity structures are arranged in the mounting holes respectively, and one second polarity structure is arranged between the two first polarity structures.

[0018] In one of the embodiments, a first boss is arranged in the housing, and the outer periphery of the diaphragm is connected to the first boss.

[0019] In one of the embodiments, the side wall of the housing is provided with a sound outlet, the first boss, the diaphragm, the second polarity structure and one first polarity structure form a first sound cavity, and the first sound cavity is communicated with the sound outlet.

[0020] The first boss, the diaphragm, the second polarity structure and another first polarity structure form a first back cavity.

[0021] In one of the embodiments, the second boss is provided with a second sound channel, the second sound channel is communicated with the second sound cavity, and the second sound cavity is communicated with the sound outlet through the corresponding second sound channel.

[0022] In one of the embodiments, the first polarity structure, the second polarity structure and the diaphragm are multiple, the multiple first polarity structures and the multiple second polarity structures are arranged alternately in the first direction, and one second polarity structure is arranged between every two adjacent first polarity structures.

[0023] In one of the embodiments, the housing is provided with a second boss, and in the first direction, the plurality of first polarity structures include two outer first polarity structures arranged at the outermost sides and at least one inner first polarity structure arranged between the two outer first polarity structures, the two outer first polarity structures being arranged on the housing wall of the housing, and the inner first polarity structure and the diaphragm being connected to the second boss.

[0024] In one of the embodiments, the diaphragm, the second polarity structure connected to the diaphragm, the first polarity structure on one side of the diaphragm, and the second boss form a second sound cavity therebetween; and the diaphragm, the second polarity structure connected to the diaphragm, the first polarity structure on the other side of the diaphragm, and the second boss form a second back cavity therebetween.

[0025] The side wall of the housing is provided with a sound outlet, and the second sound cavity is in communication with the sound outlet.

[0026] In one of the embodiments, the second boss is provided with a first electrical connector, one end of the first electrical connector being connected to an external power source, and the plurality of second polarity structures and the plurality of inner first polarity structures are electrically connected to the other end of the first electrical connector.

[0027] In one of the embodiments, the first polarity structure includes the electrode layer, the sound emitting unit further includes a first electrical connector, one end of the first electrical connector being electrically connected to an external power source, and the other end of the first electrical connector being electrically connected to the first polarity structure between two adjacent second polarity structures.

[0028] Alternatively, the second polarity structure includes the electrode layer, the sound emitting unit further includes a second electrical connector, one end of the second electrical connector being electrically connected to an external power source, and the other end of the second electrical connector being electrically connected to the second polarity structure.

[0029] In one of the embodiments, the second boss includes a base body and a plurality of superimposed bodies arranged on the base body, each of the superimposed bodies is provided with a second sound channel, and the plurality of second sound cavities are in communication with the sound outlet through the corresponding plurality of second sound channels.

[0030] In one of the embodiments, the first polarity structure includes the electrode layer, the second polarity structure includes an electret layer, and the inner first polarity structure is provided with a through hole.

[0031] In one of the embodiments, the first polarity structure comprises the electrode layer, the second polarity structure comprises the electret layer, the electrode layer adjacent to the first polarity structure is connected to opposite poles of an external power supply, and the electret layers of two adjacent second polarity structures are of the same polarity.

[0032] In one of the embodiments, the first polarity structure comprises the electret layer, the second polarity structure comprises the electrode layer, the electrode layer adjacent to the second polarity structure is connected to the same pole of an external power supply, and the electret layers of two adjacent first polarity structures are of opposite polarity.

[0033] In one of the embodiments, the second boss comprises a base and at least one stack arranged on the base, the at least one stack is sequentially connected in the first direction, the diaphragm is connected to the base and / or the stack, and the first polarity structure between two adjacent second polarity structures is connected to the base and / or the stack.

[0034] An electronic device comprising the sound emitting unit.

[0035] The beneficial effects of the present application are as follows:

[0036] The second polarity structure and the first polarity structure cooperate with each other to drive the diaphragm to vibrate by electric field force, and the space of the shell in the first direction is greatly utilized. When the second polarity structure connected to the diaphragm vibrates in the first direction, the maximum vibration amplitude can be close to the interval between the adjacent second polarity structure and the first polarity structure, thereby improving the vibration amplitude space of the sound emitting unit, improving the ratio of the vibration amplitude of the sound emitting unit in the first direction to the thickness of the shell, and achieving the purpose of improving the low frequency amplitude. Without stacking multiple sound emitting units, the purpose of increasing the low frequency sensitivity can be achieved, and on the basis of improving the low frequency sensitivity, the sound emitting unit can be relatively thin, and can be applied to electronic devices with high space requirements.

[0037] The electronic device provided has high low frequency sensitivity, and the sound emitting unit occupies a small space, which is beneficial to the thinning of the electronic device. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the contents of the embodiments of the present application and the drawings.

[0039] Figure 1is a structural schematic diagram of a sound emitting monomer provided by an embodiment of the present application;

[0040] Figure 2 is an exploded schematic diagram of a sound emitting monomer provided by an embodiment of the present application;

[0041] Figure 3 is an exploded diagram of a diaphragm, a positioning member and a second polarity structure provided by an embodiment of the present application;

[0042] Figure 4 is a top view of a sound emitting monomer provided by an embodiment of the present application;

[0043] Figure 5 is Figure 4 is an A-A sectional view shown in

[0044] Figure 6 is Figure 4 is a B-B sectional view shown in

[0045] Figure 7 is a structural schematic diagram of another sound emitting monomer provided by an embodiment of the present application;

[0046] Figure 8 is an exploded diagram of another sound emitting monomer provided by an embodiment of the present application;

[0047] Figure 9 is a structural schematic diagram of another bottom shell provided by an embodiment of the present application;

[0048] Figure 10 is a sectional view of another sound emitting monomer provided by an embodiment of the present application;

[0049] Figure 11 is a structural schematic diagram of another sound emitting monomer provided by an embodiment of the present application;

[0050] Figure 12 is an exploded diagram of another sound emitting monomer provided by an embodiment of the present application;

[0051] Figure 13 is a structural schematic diagram of another sound emitting monomer without a cover provided by an embodiment of the present application;

[0052] Figure 14 is a first sectional view of another sound emitting monomer provided by an embodiment of the present application;

[0053] Figure 15 is a second sectional view of another sound emitting monomer provided by an embodiment of the present application;

[0054] Figure 16 is a sectional view of a sound emitting monomer with multiple diaphragms provided by an embodiment of the present application;

[0055] Figure 17 is a structural schematic diagram of still another sound production monomer provided by an embodiment of the present application;

[0056] Figure 18 is a structural schematic diagram of still another sound production monomer without showing a cover provided by an embodiment of the present application;

[0057] Figure 19 is an exploded view of still another sound production monomer provided by an embodiment of the present application;

[0058] Figure 20 is a structural schematic diagram of still another bottom shell provided by an embodiment of the present application;

[0059] Figure 21 is a first sectional view of still another sound production monomer provided by an embodiment of the present application;

[0060] Figure 22 is a second sectional view of still another sound production monomer provided by an embodiment of the present application.

[0061] In the drawings:

[0062] 1, housing; 11, mounting hole; 12, sound outlet; 13, first boss; 131, first sound channel; 14, second boss; 140, second sound channel; 141, third sound channel; 142, base body; 143, superimposed body; 17, bottom shell; 18, cover;

[0063] 2, first polarity structure; 21, through hole; 22, outer first polarity structure; 23, inner first polarity structure;

[0064] 3, second polarity structure; 31, electret layer; 32, protective layer;

[0065] 4, diaphragm; 41, folded ring part; 42, first groove; 43, second groove;

[0066] 51, first sound cavity; 52, second sound cavity;

[0067] 61, first electrical connecting member; 62, second electrical connecting member; 63, third electrical connecting member; 7, positioning member;

[0068] 81, first rear cavity; 82, second rear cavity;

[0069] X, first direction. DETAILED DESCRIPTION

[0070] In order to make the technical problems solved by the present application, the technical solutions adopted and the technical effects reached more clear, the technical solutions of the present application will be further described below in conjunction with the accompanying drawings and specific embodiments. It can be understood that the specific embodiments described here are only used to explain the present application, but not limit the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, but not all.

[0071] It should be understood that the "one embodiment" or "an embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily mean in the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner.

[0072] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0073] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood in a broad sense, for example, it can be fixedly connected, or detachably connected, or integrated; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0074] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only means that the horizontal height of the first feature is higher than that of the second feature. The "under", "below" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only means that the horizontal height of the first feature is less than that of the second feature. In the description of the present embodiment, if not specially stated, "a plurality of" specifically means two or more than two.

[0075] In the description of the present embodiment, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and other orientation or position relationships are based on the orientation or position relationships shown in the drawings, which are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0076] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can be a mediating element.

[0077] The technical solutions of the present application will be further illustrated below in conjunction with the drawings and through specific embodiments.

[0078] The present embodiment provides a sound emitting unit, which can meet the requirement of thinning, and also has high low frequency sensitivity.

[0079] Exemplarily, as shown in Figures 1 to 21 The sound emitting unit includes a shell 1, at least one first polarity structure 2, at least one second polarity structure 3, and at least one diaphragm 4. The shell 1 serves as a support structure for the entire sound emitting unit. The shape of the shell 1 can be set according to requirements. For example, the shell 1 in the present embodiment is in the shape of a cuboid, and in other embodiments, the shell 1 can also be in the shape of a cylinder. The shell 1 has a length direction, a width direction, and a thickness direction (or height direction). In general, the length of the shell 1 is greater than the width of the shell 1. In the present embodiment, the thickness direction of the shell 1 is referred to as the first direction X.

[0080] The first polarity structure 2 and the second polarity structure 3 in the present embodiment are both disposed on the shell 1. Moreover, the first polarity structure 2 and the second polarity structure 3 are alternately disposed along the first direction X.

[0081] In the present embodiment, the number of diaphragms 4 is the same as and one-to-one corresponds to the number of second polarity structures 3. The diaphragm 4 is disposed inside the shell 1, and the inner periphery of the diaphragm 4 is connected to the corresponding second polarity structure 3. The outer periphery of the diaphragm 4 is connected to the shell 1, so that the second polarity structure 3 is connected to the shell 1 through the diaphragm 4. In the present embodiment, the second polarity structure 3 is not directly connected to the shell 1, but is connected to the shell 1 through the diaphragm 4.

[0082] It should be noted that one of the first polarity structure 2 and the second polarity structure 3 includes the electrode layer, and the other of the first polarity structure 2 and the second polarity structure 3 includes the electret layer 31. In the embodiment, the electrode layer is electrically connected to an external power supply, and the external power supply inputs voltage to the electrode layer. For example, the external power supply inputs alternating current to the electrode layer. In some optional embodiments, the external power supply inputs alternating current sound to the electrode layer, so that the size and frequency of the alternating current input to the electrode layer can be adjusted according to requirements, so that the diaphragm 4 can have vibrations with different amplitudes and frequencies. It should be noted that the first polarity structure 2 is fixedly connected to the shell 1, and the first polarity structure 2 does not move or vibrate relative to the shell 1.

[0083] In the embodiment, the first polarity structure 2 includes the electrode layer, which can be understood as that at least part of the first polarity structure 2 is composed of the electrode layer, or the entire first polarity structure 2 is the electrode layer, which is not limited in the embodiment. The second polarity structure 3 includes the electrode layer, which can be understood as that at least part of the second polarity structure 3 is composed of the electrode layer, or the entire second polarity structure 3 is the electrode layer, which is not limited in the embodiment.

[0084] In the embodiment, the first polarity structure 2 includes the electret layer 31, which can be understood as that at least part of the first polarity structure 2 is composed of the electret layer 31, or the entire first polarity structure 2 is the electret layer 31, which is not limited in the embodiment. The second polarity structure 3 includes the electret layer 31, which can be understood as that at least part of the second polarity structure 3 is composed of the electret layer 31, or the entire second polarity structure 3 is the electret layer 31, which is not limited in the embodiment.

[0085] In the embodiment, the electret layer 31 stores electric charges. The two adjacent electret layers 31 can cooperate to form an electrostatic field to drive the second polarity structure 3 to vibrate. Alternatively, the electrostatic field is formed between the two adjacent electrode layers to drive the second polarity structure 3 to vibrate, which is not limited in the embodiment.

[0086] In the embodiment, the first polarity structure 2 and the second polarity structure 3 cooperate to drive the diaphragm 4 to vibrate, thereby realizing sound generation. In the embodiment, the vibration direction of the diaphragm 4 is the first direction X, and it should be noted that the first polarity structure 2 and the second polarity structure 3 cooperate to make the second polarity structure 3 vibrate in the first direction X, thereby driving the diaphragm 4 to vibrate in the first direction X.

[0087] The sound production unit provided by the embodiment, the second polarity structure 3 and the first polarity structure 2 cooperate to drive the diaphragm 4 to vibrate by the electric field force, which greatly utilizes the space of the shell 1 in the first direction X, and the maximum vibration amplitude of the second polarity structure 3 connected to the diaphragm 4 when vibrating in the first direction X can be close to the interval between the adjacent second polarity structure 3 and the first polarity structure 2, thereby being capable of improving the amplitude space of the sound production unit, improving the ratio of the amplitude of the sound production unit in the first direction X to the thickness of the shell 1, and thereby achieving the purpose of improving the low-frequency amplitude, so that the low-frequency sensitivity can be increased without stacking multiple sound production units, and thereby the sound production unit can be relatively thin on the basis of improving the low-frequency sensitivity, and can be applied to electronic devices with high space requirements.

[0088] In addition, since the diaphragm 4 in the embodiment is driven by the electric field force, there is no interfering component in the vibration process of the diaphragm 4 and the second polarity structure 3, and there is no risk of voice coil disconnection, overheating and the like, and the reliability is high.

[0089] In addition, since the electric field force generated by the sound production unit is relatively uniform, the distortion is small, and the stability and acoustic performance of the sound production unit are improved.

[0090] Alternatively, the specific structure of the sound production unit provided by the embodiment can have multiple, for example, classified according to the number of diaphragms 4, which can be divided into a structure with a single diaphragm 4 and a structure with multiple diaphragms 4. For different numbers of diaphragms 4, the number of first polarity structures 2 and the number of second polarity structures 3 will also be different, which will be specifically explained below.

[0091] Exemplarily, Figures 1 to 10 is a structure diagram of the sound production unit provided by the embodiment with a single diaphragm 4. Among them, Figures 1 to 6 is a diagram in which the first polarity structure 2 includes an electrode layer, and the second polarity structure 3 includes an electret layer 31. Figures 7 to 10 is a diagram in which the first polarity structure 2 includes an electret layer 31, and the second polarity structure 3 includes an electrode layer.

[0092] In at least one embodiment, as Figures 1 to 6 shown, the first polarity structure 2 includes an electrode layer, and two first polarity structures 2 are provided, which are oppositely arranged and parallel arranged in the first direction X. The two first polarity structures 2 are respectively connected to two ends of an external power supply (specifically an alternating current power supply), the two first polarity structures 2 are opposite in polarity, and the external power supply inputs alternating current to the two first polarity structures 2 respectively, so that an electric field can be generated between the two first polarity structures 2. It should be noted that the electrode layers of the two first polarity structures 2 are electrically connected to opposite electrodes of the external power supply.

[0093] The second polarity structure 3 can vibrate under the action of the electric field force between the two first polarity structures 2. Since the second polarity structure 3 is arranged between the two first polarity structures 2, the second polarity structure 3 is attracted by one of the first polarity structures 2 and repelled by the other first polarity structure 2, so that the second polarity structure 3 vibrates. Since the two first polarity structures 2 are connected to the two ends of the alternating current power supply, the polarities of the two first polarity structures 2 are always opposite, and the driving force for the second polarity structure 3 can be continuously provided.

[0094] In the embodiment, the second polarity structures 3 and the first polarity structures 2 are arranged alternately along the first direction X, that is, there is a first polarity structure 2 between any two adjacent second polarity structures 3 along the first direction X. The second polarity structure 3 includes an electret layer 31, and the electret layer 31 stores electric charges, that is, the second polarity structure 3 is a structure carrying electric charges.

[0095] In some embodiments, the electric charges in the first polarity structure 2 are affected by the electric field force between the two first polarity structures 2, and the second polarity structure 3 can vibrate.

[0096] In some alternative embodiments, the second polarity structures 3 are arranged parallel to the first polarity structures 2, so that the forces acting on the second polarity structures 3 or the first polarity structures 2 can be more balanced, thereby ensuring the stability of sound production.

[0097] Optionally, the second polarity structure 3 is a flat plate structure, that is, the electret layer 31 is a flat plate structure. In this way, the electric charges can be uniformly distributed in the electret layer 31. Of course, it can be understood that the electric charges can also be unevenly distributed in the electret layer 31.

[0098] In some embodiments, the first polarity structure 2 is a flat plate structure.

[0099] In the embodiment, the inner periphery of the diaphragm 4 is connected to the second polarity structure 3, and the outer periphery of the diaphragm 4 is connected to the shell 1.

[0100] In at least one embodiment, the electret layer 31 has a high charge density to be able to cooperate with the first polarity structure 2 to generate a larger electric field force.

[0101] In one embodiment, the specific surface area of the electret layer 31 is greater than or equal to 100 mm 2 / mm 3 When the specific surface area of the electret layer 31 satisfies greater than or equal to 100 mm 2 / mm 3At this time, the charge density of the electret layer 31 can be higher to ensure the strength of the electric field force. It should be noted that the specific surface area of the electret layer 31 refers to the ratio of the surface area to the volume of the electret layer 31.

[0102] Further optionally, the specific surface area of the electret layer 31 is greater than or equal to 600 mm 2 / mm 3 .

[0103] Optionally, the charges in the electret layer 31 can be positive charges or negative charges. The present embodiment is not limited in this regard. When the charges in the electret layer 31 are negative charges, the volume of the electrons is small, which can help to improve the charge density.

[0104] In one implementation, the charges in the electret layer 31 are negative charges, and the surface charge density of the electret layer 31 is greater than or equal to 10 -3 C / m 2 When the surface charge density of the electret layer 31 is greater than or equal to 10 -3 C / m 2 , the charges can have a higher density, thereby ensuring the uniformity and strength of the generated electric field force. It should be noted that the surface charge density refers to the number of charges per unit area.

[0105] Further optionally, the surface charge density of the electret layer 31 is greater than or equal to 10 -2 C / m 2 .

[0106] In at least one embodiment, the material of the electret layer 31 includes SiO2, Si3N4, or other materials. When the material of the electret layer 31 is SiO2 or Si3N4, more charges can be stored.

[0107] Optionally, the second polarity structure 3 further includes a protective layer 32 covering the electret layer 31. By providing the protective layer 32, on the one hand, the electret layer 31 can be protected; on the other hand, the rigidity of the second polarity structure 3 as a whole can be improved, thereby effectively improving the high-frequency characteristics.

[0108] In some optional embodiments, the material of the protective layer 32 includes polyethylene naphthalate (PEN), polyethylene terephthalate (PET), or other high molecular materials.

[0109] In some optional embodiments, the material of the electrode layer of the first polarity structure 2 is a metal material, for example, the material of the electrode layer is a metal material such as copper or copper alloy, and the present embodiment is not limited in this regard.

[0110] In at least one embodiment, the vibrating diaphragm 4 is an electrically conductive body. By setting the vibrating diaphragm 4 as an electrically conductive structure, the external power supply and the second polarity structure 3 are electrically connected through the vibrating diaphragm 4, the setting of other electrically conductive structures is reduced, the internal structure of the loudspeaker is simplified, and the vibrating diaphragm structure is not prone to wire breakage, thereby reducing the complexity of the internal structure of the loudspeaker.

[0111] When the second polarity structure 3 includes an electret layer, by setting the vibrating diaphragm 4 as an electrically conductive body, the external power supply is conveniently connected through the vibrating diaphragm 4 to supplement the charge lost over time to the second polarity structure 3 to ensure the amount of charge subjected to the electric field force in the electric field.

[0112] When the second polarity structure 3 includes an electrode layer, the vibrating diaphragm 4 is an electrically conductive body, the external alternating current power supply can be electrically connected to the second polarity structure 3 through the vibrating diaphragm 4, without the need to set an additional electrical connector, and since the vibrating diaphragm 4 itself is a conductor, wire breakage is not prone to occur during vibration, and the stability of the loudspeaker as a whole is high.

[0113] Of course, it can be understood that in one embodiment, the vibrating diaphragm 4 is an electrically conductive body, which can be that the vibrating diaphragm 4 itself is an electrically conductive body, or that electrically conductive particles, electrically conductive wires (such as silver wires, copper wires, etc.), electrically conductive coatings, electrically conductive strips, etc. are added to the material forming the vibrating diaphragm 4 to obtain a vibrating diaphragm 4 provided with an electrically conductive body, and the present embodiment does not limit this.

[0114] In one embodiment, the vibrating diaphragm 4 is provided with an electrically conductive structure, and the present embodiment does not limit this.

[0115] In one embodiment, as shown in Figure 3 The vibrating diaphragm 4 is provided with a second groove 43, the inner periphery of the vibrating diaphragm 4 is provided with the second groove 43, the outer periphery of the second polarity structure 3 is arranged in the second groove 43, and the second polarity structure 3 is fixedly and electrically connected with the groove wall of the second groove 43. By arranging the second groove 43, the connection area of the second polarity structure 3 and the vibrating diaphragm 4 can be increased, thereby improving the connection strength of the second polarity structure 3 and the vibrating diaphragm 4, reducing the risk of separation of the second polarity structure 3 and the vibrating diaphragm 4 during vibration, and improving the connection strength and reliability.

[0116] Optionally, please continue to refer to Figure 3 The second groove 43 is an L-shaped groove, and the depth of the second groove 43 is equal to the thickness of the second polarity structure 3. Of course, it can be understood that the second groove 43 can also be a U-shaped groove, and the edge of the second polarity structure 3 is inserted into the U-shaped groove, and the present embodiment does not limit this.

[0117] In the present embodiment, the specific structure of the vibrating diaphragm 4 can be adjusted according to requirements. In one embodiment, as shown in Figure 5 and Figure 6As shown, the diaphragm 4 is convexly arranged along the first direction X, that is, the part between the inner periphery and the outer periphery of the diaphragm 4 is convex. In this way, the area of the diaphragm 4 in contact with the air can be larger, and thus more volume of air can be pushed at the same amplitude, so as to improve the low-frequency sensitivity and high-frequency sensitivity of the sound emitting unit.

[0118] Optionally, as shown in Figure 5 and Figure 6 , the convex shape of the diaphragm 4 can be arc-shaped or other shapes, which are not limited in the embodiment.

[0119] In some optional embodiments, as shown in Figure 5 , the diaphragm 4 includes a folded ring part 41, which is convex along the first direction X.

[0120] In other embodiments, the diaphragm 4 can also be planar, that is, the diaphragm 4 can not have a convex shape, and vibration sound emission can also be achieved.

[0121] In some optional embodiments, as shown in Figure 2 , both shell walls of the shell 1 along the first direction X are provided with mounting holes 11. The mounting holes 11 are used to mount the first polarity structure 2. Exemplarily, the two mounting holes 11 are oppositely arranged and centered, so that the structure mounted in the mounting holes 11 can be directly opposite, thereby generating a larger electric field.

[0122] In the embodiment, as shown in Figure 6 or Figure 7 , the two mounting holes 11 are both mounted with the first polarity structure 2. By mounting the first polarity structure 2 in the mounting holes 11 of the shell 1, on the one hand, the first polarity structure 2 does not occupy the internal space of the shell 1, but fully utilizes the wall thickness of the shell 1, which is beneficial to the miniaturization and thinning of the sound emitting unit; on the other hand, the first polarity structure 2 is exposed by the mounting holes 11, and the external power supply can be directly electrically connected with the first polarity structure 2 without passing through the shell 1, which is convenient for the assembly of the sound emitting unit and can improve the assembly reliability and efficiency.

[0123] Optionally, the first polarity structure 2 can be mounted in the mounting hole 11 by adhesion, so as to have higher connection strength. In an implementable way, the mounting hole 11 can be a stepped hole, and the first polarity structure 2 is lapped on the step surface of the stepped hole and connected with the step surface, so that the first polarity structure 2 has a larger connection area with the shell 1, thereby improving the connection strength.

[0124] As shown in Figure 2 and Figure 5As shown, the diaphragm 4 located in the shell 1 can be connected to the shell 1 through the first boss 13. In an embodiment, the first boss 13 is arranged in the shell 1, and the outer periphery of the diaphragm 4 is connected to the first boss 13 to realize the connection with the shell 1. By arranging the first boss 13, the support of the diaphragm 4 can be realized, and then the indirect support of the second polarity structure 3 is realized, so that the second polarity structure 3 has a spacing with the first polarity structures 2 on both sides, and the spacing forms an amplitude space. In some alternative embodiments, the first boss 13 and the shell 1 can be an integral structure.

[0125] Alternatively, the diaphragm 4 can be directly connected to the first boss 13; or the diaphragm 4 can also be electrically connected to the second polarity structure 3 through other components, for example, please refer to Figure 3 and Figure 6 The outer periphery of the diaphragm 4 is fixedly connected with a positioning piece 7, and the positioning piece 7 is fixedly connected to the first boss 13. By arranging the positioning piece 7, the connection strength of the diaphragm 4 and the first boss 13 can be improved. In an embodiment, the first boss 13 is provided with a limiting groove (not shown in the figure), and the positioning piece 7 can be fixedly arranged in the limiting groove to improve the limiting effect of the positioning piece 7.

[0126] It should be noted that when the diaphragm 4 is connected with the positioning piece 7, in an embodiment, the positioning piece 7 and the second polarity structure 3 are located on the same side of the diaphragm 4.

[0127] In at least one embodiment, as shown in Figure 3 The diaphragm 4 is provided with a first groove 42 matched with the positioning piece 7, the first groove 42 is located at the outer periphery of the diaphragm 4, the positioning piece 7 is arranged in the first groove 42, and the positioning piece 7 is fixedly connected with the groove wall of the first groove 42. By arranging the first groove 42, the connection area of the positioning piece 7 and the diaphragm 4 can be increased, and then the connection strength of the positioning piece 7 and the diaphragm 4 can be improved, the risk of separation of the positioning piece 7 and the diaphragm 4 in the vibration process can be reduced, and the connection strength and the connection reliability can be improved.

[0128] It should be noted that when the diaphragm 4 can conduct electricity, the positioning piece 7 and the diaphragm 4 are not only fixedly connected, but also can be electrically connected. In this way, the external power supply is electrically connected with the second polarity structure 3 through the positioning piece 7, the diaphragm 4, and further reduces the use of electrical connectors.

[0129] In some alternative embodiments, the first boss 13 is substantially annular, and as shown in Figure 1 The side wall of the shell 1 is provided with a sound outlet 12, and sound can be transmitted from the sound outlet 12 to the sound emitting body. As shown in Figure 5 or Figure 6As shown, the first boss 13, the diaphragm 4, the second polarity structure 3 and one of the two first polarity structures 2 enclose to form a first acoustic cavity 51, the diaphragm 4 pushes the air in the first acoustic cavity 51 to vibrate to generate sound, and the first acoustic cavity 51 is communicated with the sound outlet 12, so that the sound in the first acoustic cavity 51 is transmitted out through the sound outlet 12.

[0130] It should be noted that the first acoustic cavity 51 can also be referred to as a front cavity. In the embodiment, as shown in Figure 6 As shown, the shell 1, the diaphragm 4, the second polarity structure 3 and the other first polarity structure 2 of the two first polarity structures 2 can enclose to form a first rear cavity 81 of the sound generating unit. The first acoustic cavity 51 and the first rear cavity 81 are independent and not communicated with each other in the embodiment.

[0131] In one embodiment, as shown in Figure 6 As shown, the first boss 13 can be provided with a first sound channel 131, and the first sound channel 131 is used for communication between the first acoustic cavity 51 and the sound outlet 12. Of course, it can be understood that the first boss 13 can also not be provided with the first sound channel 131, and the embodiment does not limit this.

[0132] The shell 1 in the embodiment can be a split structure or an integral structure. Exemplarily, as shown in Figure 2 As shown, the shell 1 includes a bottom shell 17 and a cover 18, the bottom shell 17 has an opening, and the cover 18 is installed at the opening of the bottom shell 17 to form a relatively sealed space in cooperation with the bottom shell 17. The cover 18 and the bottom shell 17 are both provided with mounting holes 11. The first boss 13 is connected to the bottom shell 17, and the sound outlet 12 is arranged on the side wall of the bottom shell 17. By arranging the split shell 1, the assembly and disassembly of the sound generating unit can be facilitated.

[0133] The sound generating unit in the embodiment is a single diaphragm 4 structure, that is, the sound generating unit includes one diaphragm 4. The first acoustic cavity 51 and the first rear cavity 81 in the embodiment also each have one.

[0134] Exemplarily, Figures 7 to 10 is another schematic view of a sound generating unit with one diaphragm 4 provided in the embodiment.

[0135] In at least one embodiment, the first polarity structure 2 includes an electret layer, and the second polarity structure 3 includes an electrode layer. Moreover, the first polarity structure 2 is provided with two, the second polarity structure 3 is provided with one, and the diaphragm 4 is provided with one. The electret layers of the two first polarity structures 2 are opposite in electric property, that is, the stored charges in the electret layers of the two first polarity structures 2 are opposite in electric property, and alternating current is input into the second polarity structure 3.

[0136] In the embodiment, the electric properties of the charges stored in the electret layers of the two first polarity structures 2 are set to be opposite, so that a constant electric field can be formed between the two first polarity structures 2. The alternating current is still applied to the electrode layer of the second polarity structure 3, and the alternating electric field generated by the second polarity structure 3 interacts with the constant electric field formed by the two first polarity structures 2, thereby driving the second polarity structure 3 to vibrate in the first direction X, and driving the diaphragm 4 to vibrate and emit sound.

[0137] It can be seen that the sound emitting unit provided in the embodiment has only a difference from the sound emitting unit having one diaphragm 4 described above in that the first polarity structures 2 and the second polarity structure 3 are different in composition, and the rest of the structures are the same. For example, in the embodiment, when the housing 1 is provided with the mounting holes 11, the two first polarity structures 2 are still mounted in the two mounting holes 11.

[0138] In one embodiment, when the diaphragm 4 is a conductive structure or the diaphragm 4 is provided with a conductive structure, the diaphragm 4 is electrically connected to the electrode layer of the second polarity structure 3, and of course, the diaphragm 4 can be considered to be electrically connected to the second polarity structure 3. At this time, the external power supply can input the alternating current to the electrode layer of the second polarity structure 3 through the diaphragm 4.

[0139] Exemplarily, as shown in Figure 8 , the sound emitting unit further comprises a third electrical connector 63, one end of the third electrical connector 63 being electrically connected to the external power supply. The other end of the third electrical connector 63 is electrically connected to the second polarity structure 3. Specifically, the other end of the third electrical connector 63 is electrically connected to the electrode layer of the second polarity structure 3. By arranging the third electrical connector 63, the convenience and reliability of the connection between the second polarity structure 3 and the external power supply can be improved, and the connection difficulty can be reduced.

[0140] In at least one embodiment, the end of the third electrical connector 63 connected to the external power supply can be located on the outer surface of the housing 1, that is, the third electrical connector 63 is exposed by the housing 1, so as to be electrically connected to the external power supply.

[0141] Alternatively, when the diaphragm 4 is a conductive body or the diaphragm 4 is provided with a conductive structure, the other end of the third electrical connector 63 is located in the housing 1 and is electrically connected to the diaphragm 4, thereby realizing the electrical connection between the electrode layer of the second polarity structure 3 and the diaphragm 4. When the diaphragm 4 is electrically connected to the positioning member 7, the end of the third electrical connector 63 located in the housing 1 is electrically connected to the positioning member 7.

[0142] Exemplarily, as shown in Figure 10As shown, the third electrical connecting member 63 can be Z-shaped. When the first boss 13 is arranged in the shell 1, the third electrical connecting member 63 is arranged in the first boss 13. For example, the third electrical connecting member 63 can be limited in the first boss 13, or alternatively, at least part of the third electrical connecting member 63 is embedded in the first boss 13, which is not limited in the embodiment.

[0143] Exemplarily, the specific compositions of the first acoustic cavity 51 and the first back cavity 81 in the sound generating unit are the same as those of the sound generating unit shown in the above embodiment, which will not be described in detail herein. Figures 1 to 6 Exemplarily, the specific compositions of the first acoustic cavity 51 and the first back cavity 81 in the sound generating unit are the same as those of the sound generating unit shown in the above embodiment, which will not be described in detail herein.

[0144] The sound generating unit provided by the embodiment is driven by electric field force, greatly utilizes the space in the first direction X, so that the amplitude in the first direction X can reach 80% of the total height of the sound generating unit, the low-frequency amplitude can be greatly improved, the low-frequency sensitivity is greatly increased, and the degree of other moving coil loudspeakers 2-3 units is reached. Since the electric field force is used as the driving force for driving, the moving coil, the magnetic circuit and other components in the moving coil loudspeaker are omitted, so that the overall structure and process steps of the sound generating unit are simplified. Moreover, the second polarity structure 3 and the diaphragm 4 are driven by the electric field force, the vibration process is not interfered by external parts, there is no risk of voice coil disconnection or overheating, and since the electric field force is relatively uniform, the distortion is small. Moreover, the diaphragm 4 has the folded ring part 41 protruding along the first direction X, so that the air volume pushed by the same amplitude is larger, so that the sensitivity of the sound generating unit is larger.

[0145] In at least one embodiment, Figures 11 to 22 , Figure 16 The structure diagram of the sound generating unit provided by the embodiment is shown in FIG. 1. As shown in FIG. 1, Figures 11 to 15 is a schematic diagram in which the first polarity structure 2 includes an electrode layer, and the second polarity structure 3 includes an electret layer 31. Figures 17 to 22 is a schematic diagram in which the first polarity structure 2 includes an electret layer 31, and the second polarity structure 3 includes an electrode layer.

[0146] It should be noted that the sound generating unit provided by the embodiment is different from the sound generating unit shown in Figures 1 to 6 in that the number of diaphragms 4 is different. The specific structure of the diaphragm 4, the specific structure of the electret layer, etc. are all the same, which will not be described in detail herein.

[0147] The sound generating unit in the embodiment is a multi-diaphragm 4 structure, exemplarily, as shown in Figures 11 to 16As shown, the first polarity structure 2, the second polarity structure 3 and the diaphragm 4 are all provided in plurality. The plurality of second polarity structures 3 and the plurality of first polarity structures 2 are arranged alternately along the first direction X. Among them, each first polarity structure 2 is connected to the shell 1. The plurality of second polarity structures 3 and the plurality of diaphragms 4 are located in the shell 1, and the diaphragm 4 corresponds to the second polarity structure 3 one by one, and the inner periphery of each diaphragm 4 is connected to the corresponding second polarity structure 3. In this embodiment, each first polarity structure 2 includes an electrode layer, and each second polarity structure 3 includes a electret layer. It should be noted that the electrode layers of the adjacent first polarity structures 2 in the first direction X are connected to opposite electrodes of an external power supply, and the electret layers of the adjacent two second polarity structures 3 have the same electrical property. In this way, the second polarity structure 3 between the adjacent two first polarity structures 2 has the same electrical property as the first polarity structure 2, and is opposite to the other first polarity structure 2, so that the vibration of the adjacent two first polarity structures 2 is opposite, that is, the adjacent two diaphragms 4 move towards or away from each other at the same time, so that the adjacent two diaphragms 4 can push or pull the air between them at the same time, thereby enhancing the acoustic performance (amplitude, frequency, etc.) of the sound emitting unit in this embodiment Figure 16 is a schematic view of a sound emitting unit including three or more diaphragms 4, and Figure 16 the drawing method is omitted.

[0148] The structure of the multi-layer diaphragm 4 provided in this embodiment can further improve the sensitivity, and is suitable for electronic devices with high sensitivity requirements. It should be noted that, on the basis of achieving the same sound quality, sound effect and other acoustic performance as the moving coil loudspeaker, the sound emitting unit in this embodiment does not have a magnetic circuit, a voice coil and other structures, and still has the advantages of small thickness, large vibration amplitude and high low-frequency sensitivity.

[0149] In at least one implementation, as shown in Figure 12 and Figure 14 shown, the first polarity structure 2 between the adjacent two second polarity structures 3 in the first direction X can be provided with a through hole 21. By providing the through hole 21, the balance of the air flow on both sides of the first polarity structure 2 can be maintained, and the acoustic performance of the sound emitting unit can be further improved.

[0150] Optionally, as shown in Figure 12 , the through hole 21 is provided in plurality to improve the balance of air flow at each position of the first polarity structure 2. The plurality of through holes 21 can be arranged in an array or not arranged in an array, which is not limited in this embodiment.

[0151] The specific structure of the shell 1 in this embodiment can be the same as that of the shell 1 in the above-mentioned embodiments, that is, the shell 1 can include a bottom shell 17 and a cover 18.

[0152] In some alternative embodiments, such as Figure 13 As shown, a second protrusion 14 is provided inside the housing 1. Exemplarily, the second protrusion 14 is connected to the bottom shell 17. Of course, it can be understood that the second protrusion 14 can also be connected to the cover 18, but this embodiment does not limit this.

[0153] In this embodiment, in the first direction X, such as Figure 16 As shown, the plurality of first polarity structures 2 may include two outermost first polarity structures 22 and at least one inner first polarity structure 23 disposed between the two outermost first polarity structures 22. That is, the first first polarity structure 2 and the last first polarity structure 2 in the first direction X are both outer first polarity structures 22. The inner first polarity structure 23 is located between two adjacent second polarity structures 3. In this embodiment, the inner first polarity structure 23 may be provided with a through hole 21.

[0154] In this embodiment, two outer first polar structures 22 are disposed on the shell wall of the housing 1, and the inner first polar structure 2 and the diaphragm are both connected to the second boss 14 so as to achieve a fixed connection with the housing 1 through the second boss 14.

[0155] In this embodiment, the outer periphery of each diaphragm 4 is connected to the second protrusion 14 to achieve connection with the housing 1. When the diaphragm 4 is connected to the positioning member 7, the positioning member 7 is connected to the second protrusion 14. By setting the second protrusion 14, the structure located inside the housing 1 can be easily supported and fixed, thereby forming a sound cavity.

[0156] For example, such as Figure 12 As shown, both shell walls of the housing 1 in the first direction X are provided with mounting holes 11, and the two outer first polar structures 22 are respectively installed in the mounting holes 11. It can be understood that the second boss 14 can also be provided with assembly holes, and the first polar structure 2 is installed in the assembly holes on the second boss 14.

[0157] In at least one implementation, such as Figure 14 and Figure 15 As shown, for each diaphragm 4, a second acoustic cavity 52 is formed by the diaphragm 4, the second polar structure 3 connected to the diaphragm 4, the second protrusion 14, and the first polar structure 2 on one side of the diaphragm 4. A second rear cavity 82 is formed by the diaphragm 4, the second polar structure 3 connected to the diaphragm 4, the second protrusion 14, and the first polar structure 2 on the other side of the diaphragm 4. A sound outlet 12 is provided on the side wall of the housing 1, and each second acoustic cavity 52 communicates with the sound outlet 12 so that the generated sound is transmitted from the sound outlet 12.

[0158] The second boss 14 is arranged to form the second acoustic cavity 52 and the second back cavity 82, so that the second boss 14 is used to support the second polarity structure 3, the first polarity structure 2 and the diaphragm 4, thereby improving the utilization of the second boss 14.

[0159] It should be noted that the number of the second acoustic cavities 52 is the same as the number of the diaphragms 4 and corresponds to the diaphragms 4. The number of the second back cavities 82 is the same as the number of the diaphragms 4 and corresponds to the diaphragms 4. The second acoustic cavities 52 and the second back cavities 82 are independent and not connected. The plurality of second back cavities 82 are connected. The plurality of second acoustic cavities 52 can be connected, for example, two adjacent second acoustic cavities 52 can be connected through the through hole 21 on the inner first polarity structure 23. Of course, it can be understood that the two adjacent second acoustic cavities 52 can also be relatively independent, which is not limited in the embodiment.

[0160] It can be understood that, as shown in Figure 12 and Figure 15 , the second boss 14 can be provided with a second sound channel 140, and the second acoustic cavity 52 can be connected with the sound outlet 12 through the second sound channel 140. Of course, it can be understood that the second acoustic cavity 52 can also be connected with the sound outlet 12 directly, which is not limited in the embodiment.

[0161] In an embodiment, as shown in Figure 15 , the second boss 14 is provided with a third sound channel 141, and the second back cavity 82 is connected with other second back cavities 82 through the third sound channel 141. Exemplarily, as shown in Figure 14 and Figure 15 , the sound emitting unit includes three first polarity structures 2. Two of the three first polarity structures 2 (i.e., the outer first polarity structure 22) are fixed in the mounting hole 11 of the shell 1, and the other first polarity structure 2 (i.e., the inner first polarity structure 23) is mounted on the second boss 14. The sound emitting unit includes two diaphragms 4 and two second polarity structures 3. The two second acoustic cavities 52 corresponding to the two diaphragms 4 are arranged adjacently, and the two second back cavities 82 are located at the opposite sides of the two second acoustic cavities 52. One of the second back cavities 82 is formed by surrounding the first polarity structure 2 arranged in the mounting hole 11 of the bottom shell 17, the second boss 14, one of the second polarity structures 3 and one of the diaphragms 4. The second back cavity 82 is provided with the third sound channel 141 corresponding to the position of the second boss 14. The other second back cavity 82 is formed by surrounding the first polarity structure 2 arranged in the cover 18, the second boss 14, the other diaphragm 4, the other second polarity structure 3 and the shell 1, that is, the second back cavity 82 is formed by the space of the shell 1 except the space of the second boss 14. Therefore, the second back cavity 82 is connected with the other second back cavity 82 through the third sound channel 141 on the second boss 14.

[0162] In one embodiment, as shown in Figure 14 and Figure 15 The second boss 14 is in a split structure to facilitate the assembly of the sound production unit. For example, the second boss 14 includes a base 142 and a superimposed body 143 arranged on the base 142. The base 142 is connected to the shell 1 (for example, connected to the bottom shell 17 of the shell 1), and the base 142 can be integrated with the bottom shell 17. The diaphragm 4 is connected to the base 142 and / or the superimposed body 143, and the first polarity structure 2 (that is, the inner first polarity structure 23) between the two adjacent second polarity structures 3 is connected to the base 142 and / or the superimposed body 143, which is not limited in this embodiment. The superimposed body 143 can be provided with one or more superimposed bodies 143 arranged in the first direction X and connected to each other to realize the superimposed arrangement of the plurality of diaphragms 4 in the first direction X.

[0163] In other embodiments, the second boss 14 can also be an integrated structure, which is not limited in this embodiment.

[0164] When the first polarity structure 2 is arranged on the surface of the shell 1, the electrical connection between the first polarity structure 2 and the external power supply can be facilitated. When there is a first polarity structure 2 (that is, an inner first polarity structure 23) in the shell 1, in order to facilitate the electrical connection between the inner first polarity structure 23 and the external power supply, in this embodiment, as shown in Figures 12 to 14 The sound production unit further includes a first electrical connector 61. One end of the first electrical connector 61 is electrically connected to the external power supply, and the other end of the first electrical connector 61 is electrically connected to the first polarity structure 2 between the two adjacent second polarity structures 3, that is, the first electrical connector 61 is electrically connected to the inner first polarity structure 23.

[0165] It should be noted that the first electrical connector 61 can be provided with one or more. When the first electrical connector 61 is provided with one, the plurality of inner first polarity structures 23 are electrically connected to the first electrical connector 61. When the first electrical connector 61 is provided with a plurality, the plurality of first electrical connectors 61 are electrically connected to the plurality of inner first polarity structures 23 one by one.

[0166] In at least one embodiment, as shown in Figure 11As shown, one end of the first electrical connecting member 61 for connecting the external power source can be located on the outer surface of the shell 1, that is, one end of the first electrical connecting member 61 is exposed from the surface of the shell 1 to facilitate electrical connection with the external power source. Exemplarily, the number of the first electrical connecting members 61 is the same as the number of the first polarity structures 2 located between two adjacent second polarity structures 3 and is arranged correspondingly. One end of each first electrical connecting member 61 is located on the outer surface of the shell 1, and the other end of each first electrical connecting member 61 is electrically connected to the corresponding inner first polarity structure 23, so that the external power source can provide alternating current to the inner first polarity structure 23 through the first electrical connecting member 61.

[0167] By arranging the first electrical connecting member 61, the difficulty of electrically connecting the first polarity structure 2 located inside the shell 1 with the external power source can be reduced, and the convenience and stability of electrical connection are improved.

[0168] In some optional embodiments, the first electrical connecting member 61 can be a solder pad. The shape of the first electrical connecting member 61 can be arranged according to requirements. For example, the first electrical connecting member 61 in the embodiment is in a zigzag shape to improve the strength of electrical connection between the first electrical connecting member 61, the external power source and the inner first polarity structure 23.

[0169] In one embodiment, the first electrical connecting member 61 can be limited by the second boss 14 to reduce the risk of movement of the first electrical connecting member 61 relative to the shell 1. For example, as shown in Figure 14 As shown, the first electrical connecting member 61 can be arranged on the second boss 14 to have a higher fixing strength. For example, at least part of the first electrical connecting member 61 is embedded in the second boss 14.

[0170] In the embodiment, the first electrical connecting member 61 is located on the surface of the shell 1 provided with the mounting hole 11, so that the first electrical connecting member 61 is closer to the first polarity structure 2 located on the surface of the shell 1, further facilitating electrical connection with the external power source and shortening the length of the connecting wire.

[0171] In at least one embodiment, when the first electrical connecting member 61 has a plurality of first electrical connecting members 61, at least part of the plurality of first electrical connecting members 61 can be connected integrally, thereby facilitating simultaneous installation of the plurality of first electrical connecting members 61, and the plurality of first electrical connecting members 61 form a contact area on the surface of the shell 1, so that there is only one electrical connection position between the external power source and the plurality of inner first polarity structures 23, further reducing the difficulty and complexity of connecting the sound emitting monomer with the external power source and improving the assembly efficiency of the sound emitting monomer into the electronic device.

[0172] In one embodiment, as shown in Figure 16As shown, when the first polarity structure 2 comprises an electrode layer, the second polarity structure 3 comprises an electret layer, and both the first polarity structure 2 and the second polarity structure 3 are provided with multiple, the electrode layers of two adjacent second polarity structures 3 are connected to opposite electrodes of an external power supply. Moreover, the electret layers of two adjacent first polarity structures 2 are electrically the same, that is, the types of the charges stored in the electret layers of all the first polarity structures 2 are the same, which are either positive charges or negative charges.

[0173] In this way, the vibration directions of two adjacent first polarity structures 2 are opposite, and thus the movement directions of two adjacent diaphragms 4 are opposite, that is, the two adjacent diaphragms 4 move towards each other or move away from each other at the same time, and thus the two adjacent diaphragms 4 can simultaneously push or pull the air between them, so as to enhance the acoustic performance (amplitude, frequency, etc.).

[0174] Figures 17 to 22 The sound generating monomer provided in this embodiment is another sound generating monomer. In this embodiment, the sound generating monomer has multiple diaphragms 4, the first polarity structure 2 comprises an electret layer, and the second polarity structure 3 comprises an electrode layer. That is, compared with the sound generating monomer shown in Figures 7 to 10 Compared with the sound generating monomer shown in Figures 11 to 15 Compared with the sound generating monomer shown in

[0175] Exemplarily, as shown in Figures 17 to 22 In this embodiment, the first polarity structure 2, the second polarity structure 3, and the diaphragm 4 are all provided with multiple. The multiple second polarity structures 3 and the multiple first polarity structures 2 are alternately arranged along the first direction X. Each first polarity structure 2 is connected to the shell 1. The multiple second polarity structures 3 and the multiple diaphragms 4 are located in the shell 1, and the diaphragm 4 corresponds to the second polarity structure 3 one by one, and the inner periphery of each diaphragm 4 is correspondingly connected to the corresponding second polarity structure 3.

[0176] The multi-layer vibration structure provided in this embodiment can further improve the sensitivity, and thus is suitable for electronic devices with high sensitivity requirements. It should be further noted that, on the basis of achieving the same sound quality, sound effect, and other acoustic performance as the moving coil loudspeaker, since the sound generating monomer in this embodiment is not provided with a magnetic circuit, a voice coil, and other structures, the sound generating monomer still has the advantages of small thickness, large vibration amplitude, and high low-frequency sensitivity.

[0177] In some optional embodiments, when the first polarity structure 2 comprises an electret layer, the second polarity structure 3 comprises an electrode layer, and both the first polarity structure 2 and the second polarity structure 3 are provided with a plurality of structures, the electrode layers of two adjacent second polarity structures 3 are connected to the same electrode of an external power source, that is, the electrode layers of all the second polarity structures 3 are electrically connected to the same electrode of the external power source, and the electrode layers have the same electrical property. In addition, the electret layers of two adjacent first polarity structures 2 have opposite electrical properties.

[0178] In this way, a constant electric field can be formed between two adjacent first polarity structures 2, and the second polarity structure 3 located in the constant electric field can interact with the constant electric field to generate an electric field force for driving the vibration of the diaphragm 4 after being supplied with alternating current. In addition, the vibration directions of two adjacent second polarity structures 3 are opposite, and thus the movement directions of two adjacent diaphragms 4 are opposite, that is, the two adjacent diaphragms 4 move towards or away from each other at the same time, and thus the two adjacent diaphragms 4 can simultaneously push or pull the air between them, thereby enhancing the acoustic performance (amplitude, frequency, etc.).

[0179] In at least one implementation, the diaphragm 4 in the present embodiment can be an electrically conductive body or can be provided with an electrically conductive structure. In this way, the diaphragm 4 is electrically connected to the corresponding second polarity structure 3, so that the external power source can supply alternating current to the second polarity structure 3 through the diaphragm 4, without the need for additional wires, thereby reducing the complexity of the sound-emitting monomer structure and avoiding the problem of space occupation by the wires.

[0180] In at least one implementation, the second polarity structure 3 located between two adjacent first polarity structures 2 in the first direction X can also be provided with a hole structure (not shown in the figure). By providing the hole structure, the balance of the air flow on both sides of the second polarity structure 3 can be maintained, thereby further improving the acoustic performance of the sound-emitting monomer.

[0181] Optionally, the hole structure can be provided with a plurality of hole structures to improve the balance of air flow at different positions of the second polarity structure 3. The plurality of hole structures can be arranged in an array or in a disorderly manner, which is not limited in the present embodiment.

[0182] In some optional embodiments, the sound-emitting monomer can be similar to the sound-emitting monomer shown in Figures 11 to 15 In some optional embodiments, the sound-emitting monomer can be similar to the sound-emitting monomer shown in

[0183] It should be noted that the forming manner of the second acoustic cavity 52 and the second back cavity 82 in the embodiment is the same as that of the first acoustic cavity 51 and the first back cavity 81 in the sound-emitting monomer shown in FIG. 1, and the same reference numerals are adopted, which will not be described herein again. Figures 11 to 15

[0184] When the first polarity structure 2 is arranged on the surface of the shell 1 and the first polarity structure 2 comprises an electret layer, a plurality of second polarity structures 3 are located in the shell 1. Each second polarity structure 3 comprises an electrode layer. In order to facilitate the electrical connection of the second polarity structure 3 with an external power supply, as shown in FIG. 2, the sound-emitting monomer further comprises a second electrical connecting piece 62. One end of the second electrical connecting piece 62 is electrically connected with the external power supply, and the other end of the second electrical connecting piece is located in the shell 1 and is electrically connected with the second polarity structure 3, so that the external power supply can provide alternating current to the second polarity structure 3 through the second electrical connecting piece 62. Figures 19 to 21

[0185] By arranging the second electrical connecting piece 62, the difficulty of electrically connecting the second polarity structure 3 located in the shell 1 with the external power supply can be reduced, and the convenience and stability of the electrical connection are improved.

[0186] In at least one embodiment, one end of the second electrical connecting piece 62 for connecting the external power supply is located on the outer surface of the shell 1, that is, one end of the second electrical connecting piece 62 is exposed from the surface of the shell 1, so as to facilitate the electrical connection with the external power supply.

[0187] In one embodiment, the number of the second electrical connecting pieces 62 is the same as that of the second polarity structures 3 and is arranged correspondingly. One end of each second electrical connecting piece 62 is located on the outer surface of the shell 1, and the other end of each second electrical connecting piece 62 is electrically connected with the corresponding second polarity structure 3, so that the external power supply can provide alternating current to the second polarity structure 3 through the second electrical connecting piece 62.

[0188] In some optional embodiments, the second electrical connecting piece 62 can be a soldering pad. The shape of the second electrical connecting piece 62 can be arranged according to requirements. For example, the second electrical connecting piece 62 in the embodiment is in a zigzag shape, so as to improve the strength of the electrical connection of the second electrical connecting piece 62 with the external power supply and the second polarity structure 3.

[0189] In one embodiment, the second electrical connecting piece 62 can be limited by the second boss 14, so as to reduce the risk of movement of the second electrical connecting piece 62 relative to the shell 1. For example, as shown in FIG. 2, the second electrical connecting piece 62 is arranged in the second boss 14. Figure 21

[0190] ​​​It is understandable that when the diaphragm 4 is configured with a conductive structure and / or the diaphragm 4 is a conductor, the second electrical connector 62 can achieve electrical connection with the corresponding second polarity structure 3 by being electrically connected to the diaphragm 4. When the diaphragm 4 is connected to a positioning member 7, the second electrical connector 62 is electrically connected to the corresponding positioning member 7 to ensure a high connection strength between the two.

[0191] In this embodiment, the second electrical connector 62 is located on the surface of the housing 1 where the mounting hole 11 is provided, so that the second electrical connector 62 is closer to the first polar structure 2 located on the surface of the housing 1, which further facilitates the electrical connection with the external power source and shortens the length of the connecting wire.

[0192] In at least one possible implementation, when multiple second electrical connectors 62 are provided, such as Figure 19 As shown, at least a portion of the multiple second electrical connectors 62 can be connected as one unit, thereby facilitating the simultaneous installation of the multiple second electrical connectors 62. Furthermore, the multiple second electrical connectors 62 form a contact area on the surface of the housing 1, so that there is only one electrical connection point between the external power supply and the multiple first polarity structures 2, further reducing the difficulty and complexity of connecting the sound-generating unit to the external power supply and improving the assembly efficiency when the sound-generating unit is assembled into the electronic device.

[0193] This embodiment also provides an electronic device, which includes a sound-emitting unit, which can be any of the sound-emitting units described above.

[0194] The electronic device provided in this embodiment has high low-frequency sensitivity and requires less space for the speaker unit, which is conducive to the thinning and lightening of the electronic device and makes the spatial arrangement more flexible.

[0195] For example, the electronic device in this embodiment can be a foldable phone, an ultra-thin TV, a computer, a smart wearable device, etc., and this embodiment does not limit it.

[0196] Note that the above are merely preferred embodiments and the technical principles employed in this application. Those skilled in the art will understand that this application is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of this application. Therefore, although this application has been described in detail through the above embodiments, this application is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of this application, the scope of which is determined by the scope of the appended claims.

Claims

1. Sound-emitting monomer, characterized in that, The application relates to a loudspeaker comprising: a shell; at least one first polarity structure arranged on the shell; at least one second polarity structure arranged on the shell, the first polarity structure and the second polarity structure being arranged alternately along a first direction, the first direction being the thickness direction of the shell; a diaphragm arranged in the shell, the inner periphery of the diaphragm being connected to the second polarity structure, and the outer periphery of the diaphragm being connected to the shell, the first polarity structure and the second polarity structure cooperating to drive the diaphragm to vibrate; wherein one of the first polarity structure and the second polarity structure comprises an electrode layer, and the other one comprises an electret layer.

2. The sound producing monomer of claim 1, wherein, The diaphragm comprises a folded ring portion which protrudes along the first direction.

3. The sound producing monomer of claim 1, wherein, The shell wall in the first direction is provided with mounting holes, and the mounting holes are mounted with the first polarity structures.

4. The sound producing monomer of claim 1, wherein, The first polarity structure is provided with two, the two shell walls in the first direction are provided with mounting holes, and the two first polarity structures are arranged in the two mounting holes respectively, and the second polarity structure is provided with one and arranged between the two first polarity structures.

5. The sound producing monomer of claim 4, wherein, The shell is provided with a first boss, and the outer periphery of the diaphragm is connected to the first boss.

6. The sound producing monomer of claim 5, wherein, The side wall of the shell is provided with a sound outlet, the first boss, the diaphragm, the second polarity structure and one first polarity structure form a first sound cavity, and the first sound cavity is communicated with the sound outlet. The first boss, the diaphragm, the second polarity structure and another first polarity structure form a first back cavity.

7. The sound producing monomer of claim 1, wherein, The first polarity structure, the second polarity structure and the diaphragm are multiple, the multiple first polarity structures and the multiple second polarity structures are arranged alternately along the first direction, and one second polarity structure is arranged between every two adjacent first polarity structures.

8. The sound producing monomer of claim 7, wherein, The shell is provided with a second boss, and in the first direction, the multiple first polarity structures comprise two outer first polarity structures arranged at the outermost side and at least one inner first polarity structure arranged between the two outer first polarity structures, the two outer first polarity structures are arranged on the shell wall, and the inner first polarity structure and the diaphragm are connected to the second boss.

9. The sound producing monomer of claim 8, wherein, The diaphragm, the second polarity structure connected to the diaphragm, the first polarity structure on one side of the diaphragm and the second boss form a second sound cavity, and the diaphragm, the second polarity structure connected to the diaphragm, the first polarity structure on the other side of the diaphragm and the second boss form a second back cavity. The side wall of the shell is provided with a sound outlet, and the second sound cavity is communicated with the sound outlet.

10. The sound producing monomer of claim 9, wherein, The second boss is provided with a second sound channel, the second sound channel is communicated with the second sound cavity, and the second sound cavity is communicated with the sound outlet through the corresponding second sound channel.

11. The sound producing monomer of claim 7, wherein, The first polarity structure comprises the electrode layer, the sound emitting unit further comprises a first electric connecting member, one end of the first electric connecting member is electrically connected with an external power supply, and the other end of the first electric connecting member is electrically connected with the first polarity structure between two adjacent second polarity structures. Alternatively, the second polarity structure comprises the electrode layer, the sound emitting unit further comprises a second electric connecting member, one end of the second electric connecting member is electrically connected with an external power supply, and the other end of the second electric connecting member is electrically connected with the second polarity structure.

12. The sound producing monomer of claim 8, wherein, The first polarity structure comprises the electrode layer, the second polarity structure comprises an electret layer, and the inner first polarity structure is provided with a through hole.

13. The sound producing monomer of claim 4 or 7, wherein, The first polarity structure comprises the electrode layer, the second polarity structure comprises an electret layer, the electrode layers of adjacent first polarity structures are connected with opposite electrodes of an external power supply, and the electret layers of two adjacent second polarity structures are of the same electric property.

14. The sound producing monomer of claim 4 or 7, wherein, The first polarity structure comprises the electret layer, the second polarity structure comprises the electrode layer, the electrode layers of adjacent second polarity structures are connected with the same electrode of an external power supply, and the electret layers of two adjacent first polarity structures are of opposite electric property.

15. The sound producing monomer of claim 8, wherein, The second boss comprises a base body and at least one stacking body provided on the base body, the at least one stacking body is connected in sequence along the first direction, the diaphragm is connected to the base body and / or the stacking body, and the first polarity structure between two adjacent second polarity structures is connected to the base body and / or the stacking body.

16. An electronic device, characterized by The sound emitting unit comprises the diaphragm and the first polarity structure, and the second polarity structure comprises the electrode layer. The sound emitting unit comprises the diaphragm and the first polarity structure, and the second polarity structure comprises the electrode layer.

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