Sound production device and electronic device

Abstract

The application discloses a sound production device and electronic equipment, and relates to the technical field of electroacoustic transduction, wherein the sound production device comprises a shell and sound production units, the number of the sound production units is two, the two sound production units are oppositely arranged on two sides of the shell and form a front cavity together with the shell, and the shell is provided with a sound hole communicating with the front cavity; each sound production unit comprises a magnetic circuit system and a vibration system, the magnetic circuit system comprises a center magnetic circuit and an edge magnetic circuit, and the edge magnetic circuit is arranged at intervals from the center magnetic circuit to form a magnetic gap; the center magnetic circuit comprises a first center magnetic steel, a central magnetic steel and a second center magnetic steel which are sequentially stacked; the vibration system comprises a diaphragm and a voice coil, and the voice coil is arranged corresponding to the magnetic gap and the central magnetic steel; wherein the sound production unit is provided with a resonance cavity communicating with the front cavity. The resonance cavity is used for adjusting the upper limit frequency of high frequency, thereby improving the front cavity lip teeth sound and improving the acoustic performance of the sound production device; the sound waves output by the two sound production units are superimposed on each other, and the acoustic performance of the sound production device is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electroacoustic transducer technology, and in particular to a sound-generating device and an electronic device. Background Art

[0002] In recent years, demand for convenient electronic devices (such as mobile phones, headphones, and computers) has been increasing. For example, in the case of OWS (Open Wearable Stereo) headphones, people are increasingly demanding higher sound quality, but at the same time, they have strict requirements for size. The headphones themselves cannot be too large, otherwise they will affect daily wearing comfort. Existing methods for improving sound quality typically increase the size of the magnet. However, increasing the magnet size while keeping the size of other modules unchanged results in an increase in the overall size of the headphones. Therefore, existing methods for improving headphone acoustic performance clearly fail to meet user needs. Summary of the Invention

[0003] The main purpose of the present invention is to provide a sound-generating device and an electronic device, aiming to solve the problem of how to improve the acoustic performance of the sound-generating device when the volume is certain.

[0004] To achieve the above-mentioned purpose, the sound-generating device proposed in the present invention comprises:

[0005] case;

[0006] A sound-emitting unit, wherein the number of the sound-emitting units includes two, the two sound-emitting units are arranged on both sides of the shell along a first direction and form a front cavity with the shell, and the shell is provided with a sound hole connected to the front cavity;

[0007] Each of the sound-emitting units includes a magnetic circuit system and a vibration system, and both of the vibration systems are connected to the housing; each of the magnetic circuit systems includes a magnetic yoke and a central magnetic circuit and a side magnetic circuit provided on the magnetic yoke, and the side magnetic circuit ring is provided on the periphery of the central magnetic circuit and is spaced apart from the central magnetic circuit to form a magnetic gap; the central magnetic circuit includes a first central magnetic steel, a central magnetic steel, and a second central magnetic steel stacked in sequence along the first direction, the first central magnetic steel being connected to the magnetic yoke, and two ends of the second central magnetic steel facing away from the central magnetic steel abutting against each other;

[0008] Each of the vibration systems includes a ring-shaped diaphragm and a voice coil connected to the diaphragm and driving the diaphragm to vibrate along the first direction, the voice coil is located in the magnetic gap and is arranged corresponding to the central magnet; the diaphragm has a through hole, and the end of the second central magnet away from the central magnet can pass through the through hole and extend into the front cavity, and the inner edge of the diaphragm is connected to the central magnetic circuit; wherein, at least one of the sound units has a resonant cavity connected to the front cavity.

[0009] In some embodiments, at least one of the second center magnetic steel is provided with a resonance cavity communicating with the front cavity.

[0010] And / or, two of the second center magnetic steel are spliced to form a resonance cavity communicating with the front cavity.

[0011] In some embodiments, the resonance cavity comprises a cavity and an opening communicating the cavity and the front cavity, and the number of the opening is at least one.

[0012] And / or, the number of the resonance cavity is multiple.

[0013] And / or, the resonance cavity comprises a cavity and an opening communicating the cavity and the front cavity, and the angle between the normal projection of the central axis of the opening on the projection plane perpendicular to the first direction and the normal projection of the central axis of the sound hole on the projection plane is a, 0°≤a≤180°.

[0014] In some embodiments, the side magnetic circuit of each sound emitting unit comprises a side magnetic steel and a side magnetic conducting plate, one side of the side magnetic steel is fixed to the magnetic conducting yoke, and the other side of the side magnetic steel is connected with the side magnetic conducting plate; the first center magnetic steel and the second center magnetic steel of each sound emitting unit are magnetized along the first direction and the magnetization directions are opposite, the central magnetic steel is magnetized along the second direction, the first direction and the second direction are perpendicular, the polarity of the first center magnetic steel towards the central magnetic steel is the same as the polarity of the side of the central magnetic steel close to the magnetic gap, the magnetization direction of the side magnetic steel is opposite to the magnetization direction of the first center magnetic steel, and the magnetization directions of the two second center magnetic steels are opposite.

[0015] In some embodiments, the second center magnetic steel comprises a center part and a peripheral part arranged around the periphery of the center part, and the side of the center part away from the central magnetic steel protrudes from the side of the peripheral part away from the central magnetic steel and is provided in the through hole; wherein the peripheral part and the center part are integrally formed or independently arranged.

[0016] In some embodiments, the diaphragm comprises a connecting part, a first folding ring, a flat part, a second folding ring and an inner ring part arranged in sequence from outside to inside, the connecting part is connected with the shell, the inner ring part is arranged around the center magnetic circuit, and the inner ring part is connected with the second center magnetic steel.

[0017] In some embodiments, the first folding ring protrudes towards the side magnetic circuit, and the second folding ring protrudes away from the side magnetic circuit.

[0018] And / or, the diaphragm further comprises a reinforcing part, and the reinforcing part is arranged on the side of the flat part facing the voice coil.

[0019] And / or, the connecting portion, the first fold ring, the straight portion, the second fold ring and the inner ring portion are an integrally formed structure;

[0020] And / or, the voice coils of the two sound-emitting units are arranged opposite to each other along the first direction, and the two voice coils have the same size.

[0021] In some embodiments, each of the magnetic circuit systems also includes a magnetic yoke, the side magnetic circuit includes a side magnetic steel and a side magnetic plate, one side of the side magnetic steel is fixed to the magnetic yoke, and the other side of the side magnetic steel is connected to the side magnetic plate; the first center magnetic steel is connected to the magnetic yoke.

[0022] In some embodiments, the sound unit further includes an annular bracket, the side magnetic circuit includes an edge magnetic steel and an edge magnetic conductive plate, the edge magnetic steel is connected to the edge magnetic conductive plate; one side of the annular bracket is connected to the edge magnetic conductive plate, and the other side of the annular bracket is connected to the outer edge of the diaphragm, wherein,

[0023] The annular bracket is combined with the side magnetic conductive plate by injection molding; or, the annular bracket is formed by bending and extending the periphery of the side magnetic conductive plate.

[0024] In some embodiments, each of the vibration systems further comprises a skeleton, the skeleton comprising an annular main body and a plurality of fixing portions, the annular main body being connected between the diaphragm and the voice coil, the plurality of fixing portions being sequentially spaced apart along the circumference of the annular main body;

[0025] Each of the vibration systems further includes a centering support plate, which includes a first connection portion connected to the fixed portion, a second connection portion connected to the annular bracket or the side magnetic circuit, and an elastic arm portion connecting the first connection portion and the second connection portion.

[0026] The present invention further provides an electronic device, which includes a housing and the above-mentioned sound-generating device.

[0027] The technical solution of the present invention is to arrange two sound-emitting units on both sides of the shell along the vibration direction of the diaphragm, so that the sound waves output by the two sound-emitting units can be superimposed on each other, thereby achieving an effect of nearly doubling the loudness, thereby effectively improving the acoustic performance of the sound-emitting device; and the two sound-emitting units and the shell form a front cavity, that is, the two sound-emitting units share the front cavity structure, and by arranging a resonant cavity connected to the front cavity on the sound-emitting units, the high-frequency upper limit frequency can be adjusted through the resonant cavity, thereby improving the front cavity lip and dental sounds, thereby effectively improving the acoustic performance of the sound-emitting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0029] Figure 1 Structure schematic diagram of a voice emitting device in an embodiment of the present application;

[0030] Figure 2 Structure schematic diagram of a voice emitting device in an embodiment of the present application;

[0031] Figure 3 Structure schematic diagram of a voice emitting device in an embodiment of the present application;

[0032] Figure 4 Structure schematic diagram of a voice emitting device in an embodiment of the present application;

[0033] Figure 5 Structure schematic diagram of a second center magnetic steel in an embodiment of the present application;

[0034] Figure 6 Structure schematic diagram of a center magnetic steel in an embodiment of the present application;

[0035] Figure 7 Structure schematic diagram of a first center magnetic steel in an embodiment of the present application;

[0036] Figure 8 Structure schematic diagram of a diaphragm in an embodiment of the present application;

[0037] Figure 9 Structure schematic diagram of a side magnetic steel, a side magnetic conducting plate and a ring-shaped support in an embodiment of the present application;

[0038] Figure 10 Structure schematic diagram of a skeleton in an embodiment of the present application;

[0039] Figure 11 Structure schematic diagram of a centering support sheet in an embodiment of the present application;

[0040] Figure 12 Structure schematic diagram of a sound hole center axis and an opening center axis forming an angle of 180° in an embodiment of the present application;

[0041] Figure 13 Structure schematic diagram of a voice emitting device magnetizing direction in an embodiment of the present application;

[0042] Figure 14 Fig. 1 is a schematic diagram of the magnetic field distribution of a part of the structure of a sound emitting unit in the sound emitting device according to an embodiment of the present application;

[0043] Figure 15 Fig. 2 is a schematic diagram of the frequency response curve of the sound emitting device according to an embodiment of the present application.

[0044] Brief Description of the Drawings

[0045] 100, sound emitting device; 1, shell; 11, sound hole; 2, sound emitting unit; 21, magnetic circuit system; 211, central magnetic circuit; 2111, first central magnetic steel; 21111, first magnetic steel; 21112, second magnetic steel; 2112, second central magnetic steel; 21121, peripheral part; 21122, central part; 2113, central magnetic steel; 21131, third magnetic steel; 21132, fourth magnetic steel; 212, edge magnetic circuit; 2121, edge magnetic steel; 21211, first edge magnetic steel; 21212, second edge magnetic steel; 2122, edge magnetic conducting plate; 213, magnetic conducting yoke; 214, magnetic gap; 22, vibration system; 221, diaphragm; 2211, connecting part; 2212, first folded ring; 2213, flat part; 2214, second folded ring; 2215, inner ring part; 2216, reinforcing part; 2217, through hole; 222, voice coil; 223, skeleton; 2231, main body part; 2232, fixed part; 224, centering support; 2241, first connecting part; 2242, second connecting part; 2243, elastic arm part; 23, ring-shaped support; 3, front cavity; 4, resonance cavity; 41, cavity body; 42, opening;

[0046] 200, shell; 201, rear cavity.

[0047] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0049] It should be noted that if the embodiments of the present application involve directionality indication (such as up, down, left, right, front, back, etc.), the directionality indication is only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture, and if the certain posture changes, the directionality indication also changes accordingly.

[0050] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, it means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor in the protection scope required by the present application.

[0051] In recent years, people's demand for convenient electronic devices (such as mobile phones, earphones, computers) is gradually increasing. For example, people's requirements for the sound quality of OWS (Open Wearable Stereo, open wearable stereo) earphones are gradually increasing, but at the same time, there are strict requirements for the size of the earphones, that is, the earphones themselves cannot be too large, otherwise it will affect the comfort of daily wearing. The existing method for improving sound quality is usually to increase the size of the magnet. The increase in the size of the magnet and the unchanged size of other modules will result in an increase in the overall size of the earphone. Therefore, the existing method for improving the acoustic performance of the earphone obviously cannot meet the user's demand.

[0052] The inventor found that the existing method for improving the acoustic performance of the loudspeaker is usually to increase the size of the magnet, that is, to use a larger magnet. However, in the case of a certain size of the loudspeaker, it is obviously difficult or impossible to improve the acoustic performance of the loudspeaker by this method.

[0053] Therefore, the present application proposes a sound generating device and electronic equipment, which aims to solve the problem of how to improve the acoustic performance of the sound generating device in the case of a certain size.

[0054] Please refer to Figure 1 , Figure 2 and Figure 4In some embodiments, the present invention proposes a sound-emitting device 100 including a shell 1 and a sound-emitting unit 2, the number of the sound-emitting units 2 including two, the two sound-emitting units 2 being arranged on both sides of the shell 1 relative to each other along a first direction and forming a front cavity 3 with the shell 1, and the shell 1 is provided with a sound hole 11 connected to the front cavity 3; each sound-emitting unit 2 includes a magnetic circuit system 21 and a vibration system 22, and the two vibration systems 22 are connected to the shell 1; each magnetic circuit system 21 includes a central magnetic circuit 211 and a side magnetic circuit 212, the side magnetic circuit 212 is arranged around the periphery of the central magnetic circuit 211 and is spaced apart from the central magnetic circuit 211 to form a magnetic gap 214; the central magnetic circuit 211 includes a first central magnetic steel 2 stacked in sequence along the first direction 111, a central magnet 2113 and a second central magnet 2112, the two second central magnets 2112 are in contact with each other at one end away from the central magnet 2113; each vibration system 22 includes a ring-shaped diaphragm 221 and a voice coil 222 connected to the diaphragm 221 and driving the diaphragm 221 to vibrate along a first direction, the voice coil 222 is arranged corresponding to the magnetic gap 214 and the central magnet 2113; the diaphragm 221 has a through hole 2217, and the end of the second central magnet 2112 away from the central magnet 2113 can pass through the through hole 2217 and extend into the front cavity 3, and the inner edge of the diaphragm 221 is connected to the central magnetic circuit 211; wherein, at least one sound unit 2 has a resonance cavity 4 connected to the front cavity 3.

[0055] The sound-emitting device 100 of the present invention can be a single speaker unit. The sound-emitting device 100 can be used in a sound module of an electronic device, such as a computer, a mobile phone, a smart wearable device, a laptop computer, a virtual reality device, an augmented reality device, a mixed reality device, or an extended reality device. This embodiment is described using the sound-emitting device 100 as a single speaker unit as an example.

[0056] The technical scheme of the present application is characterized in that two sound production units 2 are arranged on both sides of the shell 1 along the vibration direction of the diaphragm 221, so that the same phase sound waves output by the two sound production units 2 can be superimposed, thereby achieving the effect of nearly doubling the loudness, and effectively improving the acoustic performance of the sound production device 100 under the condition of a certain volume. In addition, the front cavity 3 is surrounded by the two sound production units 2 and the shell 1, so that the structure of the front cavity 3 is simple and regular, thereby facilitating the focusing and propagation of sound and improving the mid-high frequency performance of the sound production device 100. The two sound production units 2 share the front cavity 3 structure, and a resonance cavity 4 is arranged on the sound production unit 2 and communicates with the front cavity 3, so that the upper limit frequency of high frequency can be adjusted through the resonance cavity 4, thereby improving the lip and teeth sound of the front cavity 3 and the sharp sound of the human voice, and effectively improving the acoustic performance of the sound production device 100. Among them, the ends of the two second center magnetic steels 2112 away from the central magnetic steel 2113 abut each other, thereby increasing the reliability drop margin and improving the strength and stability of the connection between the two sound production units 2. The diaphragm 221 is provided with a through hole 2217, and at least one end of the second center magnetic steel 2112 away from the central magnetic steel 2113 protrudes away from the central magnetic steel 2113. The protrusion passes through the through hole 2217 and extends into the front cavity 3. Through this arrangement, the space of the front cavity 3 is effectively utilized to increase the volume of the magnetic steel, improve the space utilization rate of the front cavity 3, and improve the acoustic performance of the sound production device 100 under the condition of a certain volume.

[0057] It should be noted that the diaphragm 221 in the form of a ring can be a circular diaphragm 221 with a through hole 2217 formed in the form of a circular ring, or a rectangular diaphragm 221 with a through hole 2217 formed in the form of a ring, which is not limited here. The shape of the through hole 2217 can be circular or square, which is not limited here. It should be noted that the voice coil 222 is arranged corresponding to the magnetic gap 214, which can be that the whole voice coil 222 is located in the magnetic gap 214, or that one of the two ends of the voice coil 222 in the first direction is located in the magnetic gap 214, which is not limited here. The voice coil 222 is arranged corresponding to the central magnetic steel 2113, which can be that the center position of the voice coil 222 in the first direction is located on the same straight line as the center position of the central magnetic steel 2113 in the first direction, and the extension direction of the straight line is perpendicular to the first direction. Alternatively, the center position of the voice coil 222 in the first direction and the center position of the central magnetic steel 2113 in the first direction are arranged in the first direction, which is not limited here. It should be noted that the number of resonance cavities 4 can be one, two or more, which is not limited here, and the shapes and sizes of the plurality of resonance cavities 4 can be the same or different, which is also not limited here.

[0058] Please refer to Figure 2 and Figure 3 According to one embodiment of the present invention, two sound-emitting units 2 are symmetrically arranged on either side of the housing 1 along a first direction. This arrangement allows the two sound-emitting units 2 to output sound waves of the same phase, thereby maximizing the use of sound wave superposition. Specifically, the ends of the two second central magnets 2112, distal from the central magnet 2113, pass through the through-holes 2217 of their respective diaphragms 221, extend into the front cavity 3, and abut against each other. The two voice coils 222 are of identical size and symmetrically arranged, thereby enhancing the overall loudness of the sound-emitting device 100.

[0059] See also Figure 2 、 Figure 3 and Figure 5 In some embodiments, at least one second central magnetic steel 2112 defines a resonant cavity 4 connected to the front cavity 3. This may be defined by either or both of the two second central magnetic steels 2112. The specific configuration of the resonant cavity 4 can be flexibly adjusted based on specific needs and is not specifically limited herein. It should be noted that each second central magnetic steel 2112 can define one resonant cavity 4, or two or more resonant cavities 4. The number of resonant cavities 4 on each second central magnetic steel 2112 can be adjusted based on actual needs and is not specifically limited herein.

[0060] In some embodiments, two second central magnetic steels 2112 are spliced ​​together to form a resonant cavity 4 connected to the front cavity 3. If a complete resonant cavity 4 is divided into two parts, one part can be disposed on one of the two second central magnetic steels 2112, and the other part can be disposed on the other of the two second central magnetic steels 2112. Thus, when the ends of the two second central magnetic steels 2112 facing away from the central magnetic steel 2113 abut against each other, the two second central magnetic steels 2112 can be spliced ​​together to form a complete resonant cavity 4.

[0061] See also Figure 5In some embodiments, the resonant cavity 4 includes a cavity 41 and an opening 42 connecting the cavity 41 and the front cavity 3, and the number of the openings 42 is at least one; the purpose of providing multiple openings 42 is to better adapt to the requirements of the installation environment. If the width of the opening 42 is required to be 1, but in actual implementation, it is impossible to directly open an opening 42 with a width of 1 due to the size of the second central magnetic steel 2112, therefore, two openings 42 can be opened, and the widths of the two openings 42 are 0.6 and 0.4 respectively. By providing these two widths of openings 42, an opening 42 with a width of 1 is equivalent, thereby solving the technical problem that the existing structure cannot open an opening 42 with a width of 1, and better meeting the requirements of different installation environments. It should be noted that the shape of the cavity 41 can be square or circular, which is not specifically limited here; the cross-sectional shape of the opening 42 can also be square or circular, which is not specifically limited here.

[0062] In some embodiments, there are multiple resonance cavities 4; by setting up multiple resonance cavities 4, sound waves of different frequencies can be acoustically processed independently, so that the high-frequency upper limit frequency can be better adjusted according to needs, thereby better improving the labiodental sound of the front cavity 3.

[0063] See also Figure 5 and Figure 12 In some embodiments, the resonant cavity 4 includes a cavity 41 and an opening 42 connecting the cavity 41 and the front cavity 3. The angle between the orthographic projection of the central axis of the opening 42 on the side facing away from the cavity 41 on a projection plane perpendicular to the first direction and the orthographic projection of the central axis of the sound hole 11 on the projection plane is α, and 0°≤α≤180°. The angle α is the angle between the projection line formed by the orthographic projection of the central axis of the opening 42 on the projection plane and the projection line formed by the orthographic projection of the central axis of the sound hole 11 on the projection plane. The user can change the value of α as needed. The projection plane is not an actual physical plane, but a plane conceived for the convenience of description.

[0064] See also Figure 2 and Figure 3In some embodiments, each magnetic circuit system 21 further includes a magnetic yoke 213, and the side magnetic circuit 212 includes a side magnetic steel 2121 and a side magnetic plate 2122. One side of the side magnetic steel 2121 is fixed to the magnetic yoke 213, and the other side of the side magnetic steel 2121 is connected to the side magnetic plate 2122; the first central magnetic steel 2111 is connected to the magnetic yoke 213; in this embodiment, the magnetic yoke 213 is provided to provide reliable support for the side magnetic steel 2121 and the central magnetic circuit 211; and since the sound-generating device 100 is provided with a magnetic yoke on both sides along the first direction, The magnetic yoke 213 can be stacked with other parts without the help of other components, which greatly simplifies the overall stacking design of the electronic device. In addition, since the sound-emitting device 100 is provided with magnetic yokes 213 instead of diaphragms 221 on both sides along the first direction, there is no need to worry about the sealing problem between the diaphragm 221 and the housing 200 of the electronic device. Compared with the diaphragm 221, the magnetic yoke 213 is a rigid structural component, so it is easier to glue and thus easy to seal with the housing 200 of the electronic device.

[0065] See also Figure 2 、 Figure 13 and Figure 14 In some embodiments, the first center magnet 2111 and the second center magnet 2112 of each sound unit 2 are magnetized along the first direction and the magnetization directions are opposite, the central magnet 2113 is magnetized along the second direction, the first direction and the second direction are perpendicular, the polarity of the first center magnet 2111 toward the central magnet 2113 is the same as the polarity of the central magnet 2113 close to the magnetic gap 214, the magnetization direction of the side magnet 2121 is opposite to the magnetization direction of the first center magnet 2111, and the magnetization directions of the two second center magnets 2112 are opposite. The first central magnet 2111 and the second central magnet 2112 are both magnetized in a first direction and in opposite directions. The polarity of the first central magnet 2111 toward the central magnet 2113 is the same as the polarity of the central magnet 2113 on the side closest to the magnetic gap 214, forming a Halbach magnetic circuit. This causes the magnetic flux lines to converge and propagate evenly at the voice coil 222. Given a given volume of the sound-generating device 100, this effectively improves the BL value of the sound-generating device 100 and significantly improves the FR (Frequency Response) curve. (See [1] for details.) Figure 15, where L1 is the frequency response curve of the sound-generating device 100 of this embodiment, and L2 is the frequency response curve of a conventional single-sided speaker. As can be seen from the figure, at most frequencies, the frequency response curve of the sound-generating device 100 of this embodiment is significantly improved compared to that of conventional single-sided speakers. It should be noted that BL represents the product of the speaker's magnetic field strength and the length of the voice coil 222, i.e., the combination of B (magnetic flux density) and L (length of the voice coil 222). B represents the magnetic flux density generated by the magnet, typically measured in Teslas (T); L is the effective length of the voice coil 222, typically measured in meters (m). The BL value is a key indicator of a speaker's driving capability. The BL value determines a speaker's ability to convert electrical signals into sound. When current flows through the voice coil 222, the larger the BL value, the greater the driving force generated, resulting in a higher sound pressure level, loudness, and a greater dynamic range. At the same time, the magnetizing directions of the two first center magnets 2111 are opposite, and the magnetizing directions of the two side magnets 2121 are opposite. In this way, the magnetic flux lines of the two magnetic circuit systems repel each other, which is more conducive to the concentrated distribution of the magnetic flux lines of the magnetic circuit system on each side, reducing leakage magnetic flux and improving FR performance.

[0066] See also Figure 4 and Figure 7According to an embodiment of the present application, the first center magnetic steel 2111 is a whole magnet; or the first center magnetic steel 2111 comprises a plurality of first sub-magnetic steels, and the plurality of first sub-magnetic steels are arranged to form a first magnetic plate; or the first center magnetic steel 2111 comprises a plurality of first magnetic pieces, and the plurality of first magnetic pieces are arranged to form a plate shape, and the plurality of first magnetic pieces comprise at least one magnetic steel. The first center magnetic steel 2111 can be a whole complete magnet, which can be square or rectangular, without limitation. The first center magnetic steel 2111 can also be a plurality of first sub-magnetic steels, which can be arranged in sequence along a second direction, or arranged in sequence along a third direction, without specific limitation. The first direction, the second direction and the third direction are perpendicular to each other, and the shape of the first sub-magnetic steel can be square or other shapes, without limitation. The first center magnetic steel 2111 can also be formed by splicing a plurality of first magnetic pieces, and the shapes of the plurality of first magnetic pieces can be the same or different, without specific limitation. The plurality of first magnetic pieces comprise at least one magnetic steel, so as to form a Halbach magnetic circuit, increase the number of magnetic induction lines passing through the voice coil 222, and further improve the acoustic performance of the sound generating device 100. The remaining first magnetic pieces can be made of a magnetic plate or a magnetic conductive plate. The plurality of first sub-magnetic steels comprise two first magnetic steels 21111 arranged in sequence along the second direction, both of which are magnetized along the first direction and opposite to the magnetization direction of the second center magnetic steel 2112. The plurality of first sub-magnetic steels also comprise two second magnetic steels 21112 arranged in sequence along the third direction, both of which are arranged on the two sides of the first magnetic steel 21111 along the third direction, and both of which have the same magnetization direction as the first magnetic steel 21111. The first direction is the up-down direction shown in Figure 2 , the second direction is the left-right direction shown in Figure 2 , and the third direction is the front-rear direction shown in Figure 6 .

[0067] Please refer to Figure 4 and Figure 6According to another embodiment of the present invention, the central magnetic steel 2113 is a whole magnet; or, the central magnetic steel 2113 is a whole magnet, the magnet is provided with a center hole, and the magnet is radially magnetized from the center hole to the periphery; or, the central magnetic steel 2113 includes multiple second sub-magnets, and the multiple second sub-magnets are arranged to form a second magnetic plate; or, the central magnetic steel 2113 includes multiple second magnetic members, and the multiple second magnetic members are arranged to form a plate, and the multiple second magnetic members include at least one magnetic steel. In the first embodiment, the central magnetic steel 2113 can be a whole magnet, and the magnet is magnetized radially, such as the magnetization direction of the magnet can be magnetized from the center of the magnet to the surrounding edges of the magnet. In the second embodiment, a through hole can be provided in the middle of the magnet, that is, the through hole is provided concentrically with the center of the magnet. The provision of the through hole can facilitate magnetization of the magnet. In addition, a magnetic conductive plate can be provided in the through hole after magnetization to further improve the magnetic properties. In a third embodiment, the central magnet 2113 can also be formed by splicing together multiple pieces of magnetic second sub-magnets. For example, it can be formed by splicing together rectangular second sub-magnets, or multiple triangular second sub-magnets. Of course, it can also be formed by splicing together second sub-magnets of other shapes, and can be spliced ​​together to form a magnetic plate. In a fourth embodiment, the multiple magnetic pieces that make up the magnetic plate can include only one or more inherently magnetic second sub-magnets, and the rest can be washers or magnetic conductive plates. The whole magnet method of the first and second embodiments is more convenient to manufacture, while the third and fourth embodiments facilitate the repair and replacement of the second sub-magnets, which can reduce maintenance costs.

[0068] See also Figure 4 and Figure 6 In some embodiments, the plurality of second sub-magnets include two third magnetic steels 21131 arranged along the second direction. The magnetization directions of the two third magnetic steels 21131 are opposite and parallel to the second direction. The central magnetic steel 2113 can be composed of two third magnetic steels 21131, which are spliced ​​together to form a single central magnetic steel 2113. The magnetization directions of the two third magnetic steels 21131 are opposite and parallel to the second direction. The magnetization direction can also be radial magnetization from the center outward. The opposite magnetization directions enable the central magnetic circuit 211 and the side magnetic circuit 212 of each speaker 2 to form at least two closed magnetic circuits passing through the voice coil 222, thereby increasing the magnetic field strength and thus improving the acoustic performance of the speaker 2.

[0069] See also Figure 4 and Figure 6In some embodiments, the plurality of second sub-magnets further include two fourth magnetic steels 21132 arranged along a third direction. The magnetization directions of the two fourth magnetic steels 21132 are opposite and parallel to the third direction. The first, second, and third directions are perpendicular to each other. The first direction can be vertical, i.e., the height direction of the sound unit 2, and the second and third directions are both horizontal. In this embodiment, four second sub-magnets are provided, including two third magnetic steels 21131 and two fourth magnetic steels 21132. The magnetization direction can also be radial magnetization from the center outward. Using radial magnetization, the central magnetic circuit 211 and the side magnetic circuits 212 form multiple closed magnetic loops passing through the voice coil 222, thereby increasing the magnetic field strength and thus improving the acoustic performance of the sound unit 2.

[0070] See also Figure 4 and Figure 5 In some embodiments, the second central magnet 2112 includes a central portion 21122 and a peripheral portion 21121 arranged around the central portion 21122, wherein the central portion 21122 protrudes from the side facing away from the central magnet 2113, and the peripheral portion 21121 protrudes from the side facing away from the central magnet 2113 and is arranged on the through hole 2217; wherein the peripheral portion 21121 and the central portion 21122 are an integrally formed structure or are arranged independently of each other. By passing the side of the center portion 21122 facing away from the central magnet 2113 through the through hole 2217 and then extending it into the front cavity 3, the volume of the second center magnet 2112 is increased, thereby effectively improving the acoustic performance of the sound-emitting device 100; wherein, the outer portion 21121 is located on the side of the diaphragm 221 facing away from the front cavity 3, thereby improving the space utilization rate of this side, and the formed outer portion 21121 can also effectively increase the volume of the second center magnet 2112; the part of the center portion 21122 extending into the front cavity 3 effectively utilizes the space of the front cavity 3, improves the space utilization rate of the front cavity 3, and thereby increases the volume of the second center magnet 2112, further effectively improving the acoustic performance of the sound-emitting device 100. It should be noted that the outer portion 21121 and the central portion 21122 are an integrally formed structure, that is, the second central magnet 2112 is an integral magnet; the outer portion 21121 and the central portion 21122 are independently arranged, that is, the second central magnet 2112 is composed of two magnets, the outer portion 21121 magnet and the central portion 21122 magnet.

[0071] See also Figure 2 and Figure 8In some embodiments, the diaphragm 221 includes a connecting portion 2211, a first fold 2212, a straight portion 2213, a second fold 2214, and an inner ring 2215, arranged in sequence from the outside to the inside. The connecting portion 2211 is connected to the housing 1, and the inner ring 2215 is arranged around the central magnetic circuit 211 and connected to the second central magnet 2112. The first fold 2212 and the second fold 2214 can reduce sound distortion.

[0072] See also Figure 3 and Figure 8 In some embodiments, the first fold 2212 protrudes toward the side magnetic circuit 212, while the second fold 2214 protrudes away from the side magnetic circuit 212. The protrusion of the first fold 2212 toward the side magnetic circuit 212 expands the space near the sound hole 11, thereby facilitating sound propagation. Furthermore, the protrusion of the second fold 2214 away from the side magnetic circuit 212 provides space for the installation of the peripheral portion 21121. This allows the peripheral portion 21121 to have a suitable installation space. By adding the peripheral portion 21121, the volume of the second central magnet 2112 can be increased, thereby improving the acoustic performance of the sound-generating device 100.

[0073] See also Figure 3 and Figure 8 In some embodiments, the diaphragm 221 further includes a reinforcement portion 2216, which is provided on the side of the straight portion 2213 facing the voice coil 222; by providing the reinforcement portion 2216, the structural strength of the straight portion 2213 of the diaphragm 221 can be effectively strengthened, thereby improving the connection stability of the voice coil 222, and avoiding problems such as tearing of the diaphragm 221 when the voice coil 222 drives the diaphragm 221 to vibrate.

[0074] In some embodiments, the connecting portion 2211, the first fold 2212, the straight portion 2213, the second fold 2214, and the inner ring portion 2215 are integrally formed. This integrally formed structure of the connecting portion 2211, the first fold 2212, the straight portion 2213, the second fold 2214, and the inner ring portion 2215 ensures the vibration performance and structural strength of the diaphragm 221.

[0075] See also Figure 1 and Figure 4In some embodiments, the sound unit 2 also includes an annular bracket 23, the side magnetic circuit 212 includes a side magnetic steel 2121 and a side magnetic conductive plate 2122, and the side magnetic steel 2121 is connected to the side magnetic conductive plate 2122; one side of the annular bracket 23 is connected to the side magnetic conductive plate 2122, and the other side of the annular bracket 23 is connected to the outer edge of the diaphragm 221, wherein the annular bracket 23 and the side magnetic conductive plate 2122 are injection molded together; or, the annular bracket 23 is formed by bending and extending the periphery of the side magnetic conductive plate 2122. In this embodiment, an annular bracket 23 is provided to provide reliable support for the side magnets. One side of the side magnet is connected to the annular bracket 23, and the other side of the side magnet is connected to the magnetic yoke 213. The annular bracket 23 can be a rectangular frame or a circular frame, which is not limited here. The annular bracket 23 can be an integral structure bracket or a bracket formed by splicing multiple structural parts, which is also not limited here. The annular bracket 23 is injection-molded with the side magnetic plate 2122, or the annular bracket 23 is formed by bending and extending the periphery of the side magnetic plate 2122, that is, the annular bracket 23 and the side magnetic plate 2122 are a single structural part, which is easy to assemble and simplifies the assembly process. The side magnetic steel 2121 can be a whole annular magnetic steel, which is arranged around the central magnetic circuit 211, or there can be multiple side magnetic steels 2121, and multiple side magnetic steels 2121 are arranged around the central magnetic circuit 211, which is not limited here.

[0076] See also Figure 13 and Figure 14 According to one embodiment of the present invention, the side magnets 2121 are magnetized along a first direction opposite to that of the first center magnet 2111. This creates closed magnetic flux lines, enhancing the driving force on the voice coil 222 and, in turn, improving the acoustic performance of the sound-generating device 100. Furthermore, the upper and lower side magnets 2121 are symmetrically positioned relative to the housing 1 and magnetized in opposite directions, further facilitating the concentrated distribution of magnetic flux lines, reducing magnetic leakage, and improving FR performance.

[0077] See also Figure 9 According to another embodiment of the present invention, the number of edge magnets 2121 is multiple, and the multiple edge magnets 2121 include two first edge magnets 21211 spaced apart along the second direction and two second edge magnets 21212 spaced apart along the third direction. The two first edge magnets 21211 and the two second edge magnets 21212 are arranged around the periphery of the central magnetic circuit 211 and spaced apart from the central magnetic circuit 211 to form a magnetic gap 214, and an avoidance space for avoiding the centering support plate 224 is formed between any adjacent first edge magnets 21211 and second edge magnets 21212; wherein the number of edge magnetic conductive plates 2122 is also multiple, and each edge magnetic conductive plate 2122 is arranged corresponding to a edge magnet.

[0078] See also Figure 2 、 Figure 10 and Figure 11 In some embodiments, each vibration system 22 further includes a skeleton 223, the skeleton 223 includes an annular main body 2231 and a plurality of fixed parts 2232, the annular main body 2231 is connected between the diaphragm 221 and the voice coil 222, and the plurality of fixed parts 2232 are arranged in sequence along the circumference of the annular main body 2231; each vibration system 22 further includes a centering support piece 224, the centering support piece 224 includes a first connecting part 2241 connected to the fixed part 2232, a second connecting part 2242 connected to the annular bracket 23 or the side magnetic circuit 212, and an elastic arm part 2243 connecting the first connecting part 2241 and the second connecting part 2242. By providing a skeleton 223, the straight portion 2213 and the voice coil 222 are connected to each other by means of the annular main body 2231 of the skeleton 223, thereby limiting the position of the voice coil 222 to the position corresponding to the central magnet 2113 as much as possible, so that the voice coil 222 can be located at the gathering point of the magnetic flux lines, thereby improving the acoustic performance of the sound-generating device 100. By providing a centering support 224, the movement direction of the voice coil 222 is limited, so that it always moves along the first direction, preventing the voice coil 222 from tilting or deviating from the track during vibration, and ensuring the stability of the vibration system 22. It should be noted that multiple fixing portions 2232 can be fixed to a first connecting portion 2241, or at least one fixing portion 2232 among the multiple fixing portions 2232 can be fixed to a first connecting portion 2241, and no specific limitation is made here.

[0079] See also Figure 4 and Figure 11 According to one embodiment of the present invention, multiple centering supports 224 are arranged sequentially along the circumference of annular bracket 23. The provision of multiple centering supports 224 effectively limits the movement direction of voice coil 222, preventing voice coil 222 from tilting or deviating from its trajectory during vibration, thereby ensuring the stability of vibration system 22. Specifically, the number of centering supports 224 matches the number of fixing portions 2232, and they are provided in a one-to-one correspondence.

[0080] The present invention also provides an electronic device (not shown), which includes a housing 200 and the above-mentioned sound-emitting device 100, with the sound-emitting device 100 disposed within the housing 200. The sound-emitting device 100 can be used in electronic devices such as computers, mobile phones, smart wearable devices, laptop computers, virtual reality devices, augmented reality devices, mixed reality devices, or extended reality devices. The sound-emitting device 100 is disposed within the housing 200, which includes a rear cavity 201 that is independently configured from the front cavity 3. The specific structure of the sound-emitting device 100 is similar to that of the above-mentioned embodiments. Since the electronic device adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, which will not be described in detail here.

[0081] The above description is merely an exemplary embodiment of the present invention and does not limit the scope of protection of the present invention. Any equivalent structural transformation made by using the contents of the present invention description and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the scope of protection of the present invention.

Claims

1. A sound-generating device, characterized in that: include case; A sound-emitting unit, wherein the number of the sound-emitting units includes two, the two sound-emitting units are arranged on both sides of the shell along a first direction and form a front cavity with the shell, and the shell is provided with a sound hole connected to the front cavity; Each of the sound-emitting units includes a magnetic circuit system and a vibration system, and both of the vibration systems are connected to the housing; each of the magnetic circuit systems includes a magnetic yoke and a central magnetic circuit and a side magnetic circuit provided on the magnetic yoke, and the side magnetic circuit ring is provided on the periphery of the central magnetic circuit and is spaced apart from the central magnetic circuit to form a magnetic gap; the central magnetic circuit includes a first central magnetic steel, a central magnetic steel, and a second central magnetic steel stacked in sequence along the first direction, the first central magnetic steel being connected to the magnetic yoke, and two ends of the second central magnetic steel facing away from the central magnetic steel abutting against each other; Each of the vibration systems includes a ring-shaped diaphragm and a voice coil connected to the diaphragm and driving the diaphragm to vibrate along the first direction, the voice coil is located in the magnetic gap and is arranged corresponding to the central magnet; the diaphragm has a through hole, and the end of the second central magnet away from the central magnet can pass through the through hole and extend into the front cavity, and the inner edge of the diaphragm is connected to the central magnetic circuit; wherein, at least one of the sound units has a resonant cavity connected to the front cavity.

2. The sound-generating device according to claim 1, wherein: At least one of the second central magnets is provided with a resonant cavity connected to the front cavity; And / or, two of the second central magnetic steels are spliced ​​to form a resonant cavity connected to the front cavity.

3. The sound-generating device according to claim 2, wherein: The resonant cavity includes a cavity body and an opening communicating with the cavity body and the front cavity, and the number of the opening is at least one; And / or, the number of the resonant cavities is multiple; And / or, the resonant cavity includes a cavity and an opening connecting the cavity and the front cavity, and the angle between the orthographic projection of the central axis of the opening on the side facing away from the cavity in the projection plane perpendicular to the first direction and the orthographic projection of the central axis of the sound hole in the projection plane is α, 0°≤α≤180°.

4. The sound-generating device according to claim 1, wherein: The side magnetic circuit of each of the sound-emitting units includes a side magnetic steel and a side magnetic conductive plate, one side of the side magnetic steel is fixed to the magnetic conductive yoke, and the other side of the side magnetic steel is connected to the side magnetic conductive plate; the first center magnetic steel and the second center magnetic steel of each of the sound-emitting units are magnetized along the first direction and the magnetization directions are opposite, the central magnetic steel is magnetized along the second direction, the first direction and the second direction are perpendicular, the polarity of the first center magnetic steel toward the central magnetic steel is the same as the polarity of the central magnetic steel close to the magnetic gap, the magnetization direction of the side magnetic steel is opposite to the magnetization direction of the first center magnetic steel, and the magnetization directions of the two second center magnetic steels are opposite.

5. The sound-generating device according to claim 4, wherein: The second central magnet includes a central portion and a peripheral portion arranged around the central portion, wherein the central portion protrudes from the side facing away from the central magnet, and the peripheral portion protrudes from the side facing away from the central magnet and protrudes from the through hole; wherein the peripheral portion and the central portion are an integrally formed structure or are arranged independently of each other.

6. The sound generating device according to any one of claims 1 to 5, characterized in that: The diaphragm includes a connecting portion, a first fold ring, a straight portion, a second fold ring and an inner ring portion which are arranged in sequence from the outside to the inside. The connecting portion is connected to the shell, the inner ring portion is arranged around the central magnetic circuit, and the inner ring portion is connected to the second central magnetic steel.

7. The sound-generating device according to claim 6, wherein: The first fold ring protrudes toward the side magnetic circuit, and the second fold ring protrudes away from the side magnetic circuit; And / or, the diaphragm further comprises a reinforcement portion, wherein the reinforcement portion is provided on a side of the straight portion facing the voice coil; And / or, the connecting portion, the first fold ring, the straight portion, the second fold ring and the inner ring portion are an integrally formed structure; And / or, the voice coils of the two sound-emitting units are arranged opposite to each other along the first direction, and the two voice coils have the same size.

8. The sound generating device according to any one of claims 1 to 5, characterized in that: The sound unit also includes an annular bracket, the side magnetic circuit includes an edge magnetic steel and a side magnetic conductive plate, the side magnetic steel is connected to the side magnetic conductive plate; one side of the annular bracket is connected to the side magnetic conductive plate, and the other side of the annular bracket is connected to the outer edge of the diaphragm, wherein, The annular bracket is combined with the side magnetic conductive plate by injection molding; or, the annular bracket is formed by bending and extending the periphery of the side magnetic conductive plate.

9. The sound-generating device according to claim 8, wherein: Each of the vibration systems further includes a skeleton, the skeleton including an annular main body and a plurality of fixing parts, the annular main body being connected between the diaphragm and the voice coil, the plurality of fixing parts being sequentially spaced apart along the circumference of the annular main body; Each of the vibration systems further includes a centering support plate, which includes a first connection portion connected to the fixed portion, a second connection portion connected to the annular bracket or the side magnetic circuit, and an elastic arm portion connecting the first connection portion and the second connection portion.

10. An electronic device, characterized in that: The electronic device comprises a housing and the sound emitting device according to any one of claims 1 to 9.

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