Sound production device and electronic equipment

Abstract

The invention discloses a sound production device and electronic equipment, and relates to the technical field of electroacoustic transduction, the sound production device comprises a shell and two sound production single bodies, the two sound production single bodies are oppositely arranged on the two sides of the shell and define a front cavity with the shell, and the shell is provided with a sound hole communicated with the front cavity; the sound production monomer comprises a magnetic circuit system and a vibration system, the magnetic circuit system comprises a central magnetic circuit and a side magnetic circuit, and the side magnetic circuit and the central magnetic circuit are arranged at intervals to form a magnetic gap; the central magnetic circuit comprises a first central magnetic steel, a central magnetic steel and a second central magnetic steel which are stacked in sequence; each vibration system comprises a vibrating diaphragm and a voice coil, and the voice coil is arranged corresponding to the magnetic gap and the central magnetic steel; the sound production single body is provided with a resonant cavity communicated with the front cavity. The resonant cavity is used to adjust the high-frequency upper limit frequency, thereby improving the lip tooth sound of the front cavity, and improving the acoustic performance of the sound production device. The sound waves output by the two sound production monomers are mutually superposed, so that 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 transducers, and particularly to a sound generating device and an electronic device. Background Art

[0002] In recent years, people's demand for portable electronic devices (such as mobile phones, earphones, and computers) has been gradually increasing. Taking OWS (Open Wearable Stereo) earphones as an example, people's requirements for the sound quality of earphones have been gradually increasing, but at the same time, there are strict requirements for the volume of earphones, that is, the earphones themselves cannot be too large, otherwise it will affect the comfort of daily wearing. The existing methods for improving sound quality usually increase the volume of the magnet. If the volume of the magnet increases while the volume of other modules remains unchanged, the overall volume of the earphone will increase. Therefore, the existing methods for improving the acoustic performance of earphones obviously cannot meet the needs of users. Summary of the Invention

[0003] The main object 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 under the condition of a certain volume of the sound generating device.

[0004] To achieve the above object, the sound generating device provided by the present invention includes: A housing; Sound generating units, the number of the sound generating units is two, the two sound generating units are oppositely arranged on both sides of the housing along a first direction and enclose a front cavity with the housing, and the housing is provided with sound holes communicating with the front cavity; Each of the sound generating units includes a magnetic circuit system and a vibration system, and the two vibration systems are both connected to the housing; each of the magnetic circuit systems includes a magnetic yoke and a central magnetic circuit and an edge magnetic circuit arranged on the magnetic yoke, the edge magnetic circuit is arranged around the central magnetic circuit and is spaced from the central magnetic circuit to form a magnetic gap; the central magnetic circuit includes a first central magnet, a central magnet, and a second central magnet which are sequentially stacked along the first direction, the first central magnet is connected to the magnetic yoke, and the ends of the two second central magnets away from the central magnet abut against each other; Each of the vibration systems includes an annular 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 corresponds 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 generating units has a resonance cavity communicating with the front cavity.

[0005] In some embodiments, at least one of the second central magnets is provided with a resonance cavity communicating with the front cavity; And / or, two of the second central magnets are spliced to form a resonant cavity communicating with the front cavity.

[0006] In some embodiments, the resonant cavity includes a cavity body and an opening communicating the cavity body and the front cavity, and the number of the openings is at least one; And / or, the number of the resonant cavities is multiple; And / or, the resonant cavity includes a cavity body and an opening communicating the cavity body and the front cavity, and the included angle between the positive projection of the central axis on the side away from the cavity body of the opening in the projection plane perpendicular to the first direction and the positive projection of the central axis of the sound hole in the projection plane is α, where 0° ≤ α ≤ 180°.

[0007] In some embodiments, the side magnetic circuit of each sounding element includes a side magnet and a side magnetic conductive plate. One side of the side magnet is fixed to the magnetic yoke, and the other side of the side magnet is connected to the side magnetic conductive plate; the first central magnet and the second central magnet of each sounding element are magnetized along the first direction and the magnetization directions are opposite, the central magnet is magnetized along the second direction, the first direction and the second direction are perpendicular, the polarity of the first central magnet facing the central magnet is the same as the polarity of the central magnet on the side close to the magnetic gap, the magnetization direction of the side magnet is opposite to the magnetization direction of the first central magnet, and the magnetization directions of the two second central magnets are opposite.

[0008] In some embodiments, the second central magnet includes a central portion and a peripheral portion disposed around the periphery of the central portion. The side of the central portion facing away from the central magnet protrudes from the side of the peripheral portion facing away from the central magnet and protrudes into the through hole; wherein, the peripheral portion and the central portion are an integrally formed structure or are independently arranged.

[0009] In some embodiments, the diaphragm includes a connecting portion, a first surround, a flat portion, a second surround and an inner ring portion which are sequentially arranged in a surrounding manner from outside to inside. The connecting portion is connected to the housing, the inner ring portion surrounds the central magnetic circuit, and the inner ring portion is connected to the second central magnet.

[0010] In some embodiments, the first surround protrudes towards the side magnetic circuit, and the second surround protrudes in a direction away from the side magnetic circuit; And / or, the diaphragm further includes a reinforcing portion, and the reinforcing portion is disposed on the side of the flat portion facing the voice coil; And / or, the connecting portion, the first surround, the flat portion, the second surround and the inner ring portion are an integrally formed structure; And / or, the voice coils of the two sounding elements are arranged oppositely along the first direction, and the sizes of the two voice coils are the same.

[0011] In some embodiments, each of the magnetic circuit systems further includes a magnetic yoke. The side magnetic circuit includes a side magnet and a side magnetic conductive plate. One side of the side magnet is fixed to the magnetic yoke, and the other side of the side magnet is connected to the side magnetic conductive plate; the first central magnet is connected to the magnetic yoke.

[0012] In some embodiments, the sounding element further includes an annular bracket. The side magnetic circuit includes a side magnet and a side magnetic conductive plate, and the side magnet 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 injection-molded and combined with the side magnetic conductive plate; or, the annular bracket is formed by bending and extending from the periphery of the side magnetic conductive plate.

[0013] In some embodiments, each of the vibration systems further includes a skeleton, the skeleton includes an annular main body portion and a plurality of fixing portions, the annular main body portion is connected between the diaphragm and the voice coil, and the plurality of fixing portions are arranged at intervals in sequence along the circumferential direction of the annular main body portion; each of the vibration systems further includes a centering washer. The centering washer includes a first connecting portion connected to the fixing portion, a second connecting portion connected to the annular bracket or the side magnetic circuit, and an elastic arm portion connecting the first connecting portion and the second connecting portion.

[0014] The present invention also provides an electronic device, which includes a housing and the above-mentioned sounding device.

[0015] The technical solution of the present invention is to respectively arrange two sounding elements on both sides of the housing along the vibration direction of the diaphragm, so that the sound waves output by the two sounding elements can be superimposed on each other, achieving an effect that the loudness is nearly doubled, effectively improving the acoustic performance of the sounding device; and the two sounding elements and the housing enclose a front cavity, that is, the two sounding elements share the front cavity structure. By arranging a resonant cavity communicating with the front cavity on the sounding element, the upper limit frequency of the high frequency can be adjusted through the resonant cavity, thereby improving the labiodental sound in the front cavity and effectively improving the acoustic performance of the sounding device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0017] Figure 1Schematic structural diagram of an embodiment of the sound generating device according to an embodiment of the present invention; Figure 2 Schematic cross-sectional structural diagram of an embodiment of the sound generating device according to an embodiment of the present invention; Figure 3 Schematic cross-sectional structural diagram of an embodiment of the sound generating device disposed in a housing according to an embodiment of the present invention; Figure 4 Schematic exploded structural diagram of an embodiment of the sound generating device according to an embodiment of the present invention; Figure 5 Schematic structural diagram of an embodiment of the second central magnet according to an embodiment of the present invention; Figure 6 Schematic structural diagram of an embodiment of the central magnet according to an embodiment of the present invention; Figure 7 Schematic structural diagram of an embodiment of the first central magnet according to an embodiment of the present invention; Figure 8 Schematic structural diagram of an embodiment of the diaphragm according to an embodiment of the present invention; Figure 9 Schematic structural diagram of an embodiment of the side magnet, side magnetic conductive plate and annular bracket according to an embodiment of the present invention; Figure 10 Schematic structural diagram of an embodiment of the skeleton according to an embodiment of the present invention; Figure 11 Schematic structural diagram of an embodiment of the centering support piece according to an embodiment of the present invention; Figure 12 Schematic structural diagram of an embodiment in which the central axis of the sound hole forms an angle of 180° with the central axis of the opening according to an embodiment of the present invention; Figure 13 Schematic structural diagram of an embodiment of the magnetization direction of the sound generating device according to an embodiment of the present invention; Figure 14 Schematic simulation diagram of the magnetic induction line distribution of a partial structure of a sound generating monomer in the sound generating device according to an embodiment of the present invention; Figure 15 Schematic diagram of the frequency response curve of the sound generating device according to an embodiment of the present invention.

[0018] Explanation of the reference numerals in the drawings: 100, Sound generating device; 1, Housing; 11, Sound hole; 2, Sound generating element; 21, Magnetic circuit system; 211, Central magnetic circuit; 2111, First central magnet; 21111, First magnet; 21112, Second magnet; 2112, Second central magnet; 21121, Peripheral part; 21122, Central part; 2113, Central magnet; 21131, Third magnet; 21132, Fourth magnet; 212, Side magnetic circuit; 2121, Side magnet; 21211, First side magnet; 21212, Second side magnet; 2122, Side magnetic conductive plate; 213, Magnetic yoke; 214, Magnetic gap; 22, Vibration system; 221, Diaphragm; 2211, Connection part; 2212, First surround; 2213, Flat part; 2214, Second surround; 2215, Inner ring part; 2216, Reinforcement part; 2217, Through hole; 222, Voice coil; 223, Skeleton; 2231, Main body part; 2232, Fixing part; 224, Centering washer; 2241, First connection part; 2242, Second connection part; 2243, Spring arm part; 23, Annular bracket; 3, Front cavity; 4, Resonant cavity; 41, Cavity; 42, Opening; 200, Outer shell; 201, Rear cavity.

[0019] The realization, functional features and advantages of the object of the present invention will be further described in conjunction with the embodiments with reference to the accompanying drawings. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0021] It should be noted that if there are directional indications (such as up, down, left, right, front, rear,...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0022] In addition, if the embodiments of the present invention involve descriptions such as "first" and "second", the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0023] In recent years, people's demand for convenient electronic devices (such as mobile phones, earphones, computers) has been gradually increasing. Taking OWS (Open Wearable Stereo) earphones as an example, people's requirements for the sound quality of earphones have been gradually increasing, but at the same time, there are strict requirements for the volume of the earphones, that is, the earphones themselves cannot be too large, otherwise it will affect the comfort of daily wearing. And the existing methods to improve sound quality usually involve increasing the volume of the magnet. If the volume of the magnet increases while the volumes of other modules remain unchanged, it will lead to an increase in the overall volume of the earphones. Therefore, the existing methods to improve the acoustic performance of earphones obviously cannot meet the needs of users.

[0024] After research by the inventor, it is found that the existing means to improve the acoustic performance of speakers usually involve increasing the volume of the magnet, that is, replacing it with a larger magnet. However, when the volume of the speaker is fixed, it is obviously difficult or impossible to improve the acoustic performance of the speaker by this means.

[0025] For this reason, the present invention proposes 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 its volume is fixed.

[0026] Please refer to Figure 1 、 Figure 2 and Figure 4, in some embodiments, the present invention provides a sound generating device 100 including a housing 1 and a sound generating element 2. The number of the sound generating elements 2 is two. The two sound generating elements 2 are disposed opposite to each other along a first direction on both sides of the housing 1 and enclose a front cavity 3 with the housing 1. The housing 1 is provided with sound holes 11 communicating with the front cavity 3; each sound generating element 2 includes a magnetic circuit system 21 and a vibration system 22, and the two vibration systems 22 are both connected to the housing 1; each magnetic circuit system 21 includes a central magnetic circuit 211 and an edge magnetic circuit 212. The edge magnetic circuit 212 is disposed 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 magnet 2111, a central magnet 2113, and a second central magnet 2112 that are sequentially stacked along the first direction. One ends of the two second central magnets 2112 facing away from the central magnet 2113 are in contact with each other; each vibration system 22 includes an annular diaphragm 221 and a voice coil 222 connected to the diaphragm 221 and driving the diaphragm 221 to vibrate along the first direction. The voice coil 222 is disposed corresponding to the magnetic gap 214 and the central magnet 2113; the diaphragm 221 has a through hole 2217. One 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 generating element 2 has a resonance cavity 4 communicating with the front cavity 3.

[0027] The sound generating device 100 of the present invention can be a speaker unit. The sound generating device 100 can be applied in a sound generating module of an electronic device. The electronic device can be 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, etc. In this embodiment, the sound generating device 100 is taken as an example of a speaker unit for illustration.

[0028] The technical solution of the present invention is to respectively arrange two sound-emitting monomers 2 on both sides of the housing 1 along the vibration direction of the diaphragm 221. Thus, by enabling the two sound-emitting monomers 2 to output sound waves with the same phase, the superposition of sound waves can be achieved, and furthermore, an effect of nearly doubling the loudness can be realized. Therefore, when the volume of the sound-emitting device 100 is fixed, the acoustic performance of the sound-emitting device 100 is effectively improved; and in this embodiment, the front cavity 3 is formed by the two sound-emitting monomers 2 and the housing 1, making the structure of the front cavity 3 simple and regular, which helps the focused propagation of sound, and further improves the mid-high frequency performance of the sound-emitting device 100; the two sound-emitting monomers 2 share the front cavity 3 structure, and by arranging a resonant cavity 4 communicating with the front cavity 3 on the sound-emitting monomer 2, the high-frequency upper limit frequency can be adjusted through the resonant cavity 4, and furthermore, the labiodental sounds of the front cavity 3 and the sharp sounds of the human voice can be improved, effectively enhancing the acoustic performance of the sound-emitting device 100. Among them, one end of the two second central magnets 2112 facing away from the central magnet 2113 abuts against each other, thereby increasing the reliability drop margin and enhancing the connection strength and stability of the two sound-emitting monomers 2; the diaphragm 221 is provided with a through hole 2217, and one end of at least one second central magnet 2112 facing away from the central magnet 2113 protrudes in a direction away from the central magnet 2113, and the protrusion passes through the through hole 2217 and extends into the front cavity 3. Through this setting, the space of the front cavity 3 is effectively utilized to increase the volume of the magnet, improve the space utilization rate of the front cavity 3, and when the volume of the sound-emitting device 100 is fixed, the acoustic performance of the sound-emitting device 100 is improved.

[0029] It should be noted that the annular diaphragm 221 can be a circular diaphragm 221 with a through hole 2217 formed to form an annular diaphragm 221, or a rectangular diaphragm 221 with a through hole 2217 formed to form an annular diaphragm 221, which is not limited here; the shape of the through hole 2217 can be circular or square, which is not limited here. It should also be noted that the voice coil 222 is arranged corresponding to the magnetic gap 214. It can be that the whole voice coil 222 is located in the magnetic gap 214, or one of the two ends of the voice coil 222 along 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 magnet 2113. It can be that the central position of the voice coil 222 in the first direction and the central position of the central magnet 2113 in the first direction are on the same straight line, and the extending direction of this straight line is perpendicular to the first direction; or the central position of the voice coil 222 in the first direction and the central position of the central magnet 2113 in the first direction are arranged at intervals along the first direction, which is not specifically limited here. It should also be noted that the number of the resonant cavities 4 can be one, or two or more, which is not limited here, and the shapes and sizes of the multiple resonant cavities 4 can be the same or different, which is also not limited here.

[0030] Please refer to Figure 2 andFigure 3 , according to an embodiment of the present invention, two sound emitting monomers 2 are symmetrically arranged on both sides of the housing 1 along the first direction. Through this arrangement, then control the two sound emitting monomers 2 to output sound waves with the same phase, so as to maximize the application of sound wave superposition. That is, one end of each of the two second central magnets 2112 far from the central magnet 2113 passes through the through hole 2217 of the corresponding diaphragm 221 and extends into the front cavity 3 to complete the abutment. Among them, the two voice coils 222 have the same size and are symmetrically arranged. This helps to improve the overall loudness of the sound emitting device 100.

[0031] Please refer to Figure 2 , Figure 3 and Figure 5 , in some embodiments, at least one of the second central magnets 2112 is provided with a resonant cavity 4 communicating with the front cavity 3; it can be that any one of the two second central magnets 2112 is provided with the resonant cavity 4, or both of the two second central magnets 2112 are provided with the resonant cavity 4. The specific setting method of the resonant cavity 4 can be flexibly adjusted according to specific needs and will not be specifically limited here. It should be noted that each second central magnet 2112 can be provided with one resonant cavity 4, or two or more resonant cavities 4. The number of resonant cavities 4 on each second central magnet 2112 can be adjusted according to actual needs and will not be specifically limited here.

[0032] In some embodiments, the two second central magnets 2112 are spliced to form a resonant cavity 4 communicating with the front cavity 3. If a complete resonant cavity 4 is divided into two parts, one part can be arranged on one of the two second central magnets 2112, and the other part can be arranged on the other of the two second central magnets 2112, so that when the ends of the two second central magnets 2112 facing away from the central magnet 2113 abut, the two second central magnets 2112 can be spliced to form a complete resonant cavity 4.

[0033] Please refer to Figure 5, in some embodiments, the resonance cavity 4 includes a cavity body 41 and an opening 42 that connects the cavity body 41 and the front cavity 3, and the number of the openings 42 is at least one; setting multiple openings 42 is to better meet the requirements of the installation environment. If the width dimension of the opening 42 is required to be 1, but in actual implementation, due to the limitation of the size of the second central magnet 2112, it is impossible to directly open an opening 42 with a width dimension of 1. Therefore, two openings 42 can be opened, and the widths of the two openings 42 are 0.6 and 0.4 respectively. By setting these two openings 42 with different widths to be equivalent to an opening 42 with a width of 1, the technical problem of being unable to open an opening 42 with a width of 1 due to the limitation of the existing structure is solved, and the requirements of different installation environments are better met. It should be noted that the shape of the cavity body 41 can be square or circular, and no specific limitation is made here; the cross-sectional shape of the opening 42 can also be square or circular, and no specific limitation is made here.

[0034] In some embodiments, the number of the resonance cavities 4 is multiple; by setting multiple resonance cavities 4, independent acoustic processing can be performed on sound waves of different frequencies, so that the high-frequency upper limit frequency can be better adjusted as needed, and thus the labiodental sounds in the front cavity 3 can be better improved.

[0035] Please refer to Figure 5 and Figure 12 , in some embodiments, the resonance cavity 4 includes a cavity body 41 and an opening 42 that connects the cavity body 41 and the front cavity 3. The positive projection of the central axis of the side of the opening 42 facing away from the cavity body 41 in the projection plane perpendicular to the first direction and the positive projection of the central axis of the sound hole 11 in the projection plane form an angle α, where 0° ≤ α ≤ 180°. The angle α is the angle between the projection line formed by the positive projection of the central axis of the opening 42 on the projection plane and the projection line formed by the positive projection of the central axis of the sound hole 11 on the projection plane, and the user can change the value of α as needed. Here, the projection plane is not an actual physical plane, but a plane conceived for the convenience of description.

[0036] Please refer to Figure 2 and Figure 3, in some embodiments, each magnetic circuit system 21 further includes a magnetic yoke 213. The side magnetic circuit 212 includes a side magnet 2121 and a side magnetic conductive plate 2122. One side of the side magnet 2121 is fixed to the magnetic yoke 213, and the other side of the side magnet 2121 is connected to the side magnetic conductive plate 2122; the first central magnet 2111 is connected to the magnetic yoke 213. In this embodiment, by providing the magnetic yoke 213, reliable support is provided for the side magnet 2121 and the central magnetic circuit 211; and since the magnetic yokes 213 are provided on both sides of the sound generating device 100 along the first direction, it can be stacked with other parts without relying on other components, greatly simplifying the overall stacking design of the electronic device; and also because the magnetic yokes 213 are provided on both sides of the sound generating device 100 along the first direction instead of the diaphragm 221, 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, since the magnetic yoke 213 is a rigid structural member, it is easier to apply glue, and thus it is easier to seal with the housing 200 of the electronic device.

[0037] Please refer to Figure 2 , Figure 13 and Figure 14 , in some embodiments, the first central magnet 2111 and the second central magnet 2112 of each sound generating element 2 are magnetized along the first direction and the magnetization directions are opposite. The central magnet 2113 is magnetized along the second direction, and the first direction and the second direction are perpendicular. The polarity of the first central magnet 2111 facing the central magnet 2113 is the same as the polarity of the central magnet 2113 on the side close to the magnetic gap 214. The magnetization direction of the side magnet 2121 is opposite to the magnetization direction of the first central magnet 2111, and the magnetization directions of the two second central magnets 2112 are opposite. Among them, the first central magnet 2111 and the second central magnet 2112 are magnetized along the first direction and the magnetization directions are opposite. The polarity of the first central magnet 2111 facing the central magnet 2113 is the same as the polarity of the central magnet 2113 on the side close to the magnetic gap 214, forming a Halbach magnetic circuit, which makes the magnetic induction lines gather and spread evenly at the voice coil 222. When the volume of the sound generating device 100 is fixed, the BL value of the sound generating device 100 is effectively improved, and the FR (Frequency Response) frequency response curve is also significantly improved; Please refer to Figure 15, where L1 is the frequency response curve of the sound generating device 100 in this embodiment, and L2 is the frequency response curve of the existing single-sided speaker. It can be seen from the figure that at most frequencies, the frequency response curve of the sound generating device 100 in this embodiment has a relatively obvious improvement compared with the frequency response curve of the existing single-sided speaker. It should be noted that BL represents the product of the magnetic field strength of the speaker and the length of the voice coil 222, that is, 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, usually in tesla (T); L is the effective length of the voice coil 222, usually in meters (m). The BL value is one of the key indicators for measuring the driving ability of the speaker. The BL value determines the ability of the speaker to convert electrical signals into sound. When current passes through the voice coil 222, the larger the BL value, the greater the driving force generated, the higher the sound pressure level of the speaker, and the greater the loudness and dynamic range of the sound. At the same time, the magnetization directions of the two first central magnets 2111 are opposite to each other, and the magnetization directions of the two side magnets 2121 are opposite to each other. In this way, the magnetic induction lines of the two magnetic circuit systems repel each other, which is more conducive to the concentrated distribution of the magnetic induction lines of each side's magnetic circuit system, reducing magnetic leakage and improving the FR performance.

[0038] Please refer to Figure 4 and Figure 7, according to an embodiment of the present invention, the first central magnet 2111 is a single piece of magnet; alternatively, the first central magnet 2111 includes multiple first sub-magnets, and the multiple first sub-magnets are arranged to form a first magnetic plate; alternatively, the first central magnet 2111 includes multiple first magnetic members, the multiple first magnetic members are arranged in a plate shape, and the multiple first magnetic members include at least one magnet. Among them, the first central magnet 2111 can be a single piece of complete magnet, and the complete magnet can be square or rectangular, which is not limited here; the first central magnet 2111 can also be multiple first sub-magnets, and the multiple first sub-magnets can be arranged in sequence along the second direction, and the multiple first sub-magnets can be arranged in sequence along the third direction, which is not specifically limited here; among them, the first direction, the second direction, and the third direction are perpendicular to each other, and the shape of the first sub-magnet can be square or other shapes, which is not limited here; the first central magnet 2111 can also be formed by splicing multiple first magnetic members, and the shapes of the multiple first magnetic members can be the same or different, which is not specifically limited here, and at least one magnet is included in the multiple first magnetic members to form a Halbach magnetic circuit, improve the number of magnetic induction lines passing through the voice coil 222, and then improve the acoustic performance of the sound generating device 100. The remaining first magnetic members can be washers or magnetic conductive plates. Among them, the multiple first sub-magnets include two first magnets 21111 arranged in sequence along the second direction, both of the two first magnets 21111 are magnetized along the first direction, and both are opposite to the magnetization direction of the second central magnet 2112; the multiple first sub-magnets also include two second magnets 21112 arranged in sequence along the third direction, the two second magnets 21112 are respectively arranged on both sides of the first magnet 21111 along the third direction, and both of the two second magnets 21112 are the same as the magnetization direction of the first magnet 21111. Among them, the first direction is Figure 2 the up and down direction shown in Figure 2 , the second direction is Figure 6 the left and right direction shown in

[0039] Please refer to Figure 4 and Figure 6, according to another embodiment of the present invention, the central magnet 2113 is a single piece of magnet; alternatively, the central magnet 2113 is a single piece of magnet with a central hole provided therein, and the magnet is radially magnetized from the central hole to the outer periphery; alternatively, the central magnet 2113 includes multiple second sub-magnets, and the multiple second sub-magnets are arranged to form a second magnetic plate; alternatively, the central magnet 2113 includes multiple second magnetic members, the multiple second magnetic members are arranged in a plate shape, and the multiple second magnetic members include at least one magnet. In the first embodiment, the central magnet 2113 can be a single piece of magnet, and the magnet is magnetized in a radial direction. For example, the magnetization direction of the magnet can be from the center of the magnet to the four 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 concentric with the center of the magnet. Providing the through hole can facilitate the magnetization of the magnet. In addition, a magnetic conduction plate can be provided in the through hole after magnetization to further improve the magnetism. In the third embodiment, the central magnet 2113 can also be formed by splicing multiple second sub-magnets with magnetism. For example, it can be formed by splicing rectangular second sub-magnets, or by splicing multiple triangular second sub-magnets. Of course, it can also be formed by splicing second sub-magnets of other shapes, and a magnetic plate can be spliced. In the fourth embodiment, among the multiple magnetic members forming the magnetic plate, only one or several second sub-magnets with magnetism can be included, and the rest can use washers or magnetic conduction plates. The production method of using a single piece of magnet in the first embodiment and the second embodiment is relatively convenient, while the third embodiment and the fourth embodiment are convenient for the maintenance and replacement of the second sub-magnets, and can reduce the maintenance cost.

[0040] Please refer to Figure 4 and Figure 6 , in some embodiments, the multiple second sub-magnets include two third magnets 21131 arranged along the second direction, and the magnetization directions of the two third magnets 21131 are opposite and both parallel to the second direction. The central magnet 2113 can be composed of two third magnets 21131. The two third magnets 21131 are spliced to form a whole central magnet 2113. The magnetization directions of the two third magnets 21131 are opposite and both parallel to the second direction. The magnetization direction can also be radially magnetized from the center to the periphery. The opposite magnetization directions enable the central magnetic circuit 211 and the edge magnetic circuit 212 of each sounding element 2 to form at least two closed magnetic circuits passing through the voice coil 222, improving the magnetic field strength, and thus improving the acoustic performance of the sounding element 2.

[0041] Please refer to Figure 4 and Figure 6, in some embodiments, the multiple second sub-magnets further include two fourth magnets 21132 arranged along a third direction. The magnetization directions of the two fourth magnets 21132 are opposite to each other and both parallel to the third direction. The first direction, the second direction, and the third direction are perpendicular to each other pairwise. The first direction may be the vertical direction, that is, the height direction of the sound generating element 2, and the second direction and the third direction are both horizontal directions. In this embodiment, four second sub-magnets are provided. The four second sub-magnets include two third magnets 21131 and two fourth magnets 21132. The magnetization direction can also be radially magnetized from the center to the periphery. Using radial magnetization enables the central magnetic circuit 211 and the edge magnetic circuit 212 to form multiple closed magnetic circuits passing through the voice coil 222, enhancing the magnetic field strength and thus improving the acoustic performance of the sound generating element 2.

[0042] Please refer to Figure 4 and Figure 5 , in some embodiments, the second central magnet 2112 includes a central portion 21122 and an outer portion 21121 disposed around the periphery of the central portion 21122. The side of the central portion 21122 facing away from the central magnet 2113 protrudes from the side of the outer portion 21121 facing away from the central magnet 2113 and protrudes into the through hole 2217; wherein, the outer portion 21121 and the central portion 21122 are of an integrally formed structure or are independently arranged. By passing the side of the central portion 21122 facing away from the central magnet 2113 through the through hole 2217 and extending it into the front cavity 3, the volume of the second central magnet 2112 is increased, thereby effectively improving the acoustic performance of the sound generating 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 on this side, and the formed outer portion 21121 can also effectively increase the volume of the second central magnet 2112; the portion of the central 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 further increases the volume of the second central magnet 2112, further effectively improving the acoustic performance of the sound generating device 100. It should be noted that the outer portion 21121 and the central portion 21122 are of an integrally formed structure, that is, the second central magnet 2112 is a single 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, namely the outer portion 21121 magnet and the central portion 21122 magnet.

[0043] Please refer to Figure 2 and Figure 8, in some embodiments, the diaphragm 221 includes a connecting portion 2211, a first surround 2212, a flat portion 2213, a second surround 2214, and an inner ring portion 2215 that are sequentially arranged from the outside to the inside in a surrounding manner. The connecting portion 2211 is connected to the housing 1, and the inner ring portion 2215 surrounds the central magnetic circuit 211 and is connected to the second central magnet 2112. By providing the first surround 2212 and the second surround 2214, the sound distortion is reduced.

[0044] Please refer to Figure 3 and Figure 8 , in some embodiments, the first surround 2212 protrudes towards the edge magnetic circuit 212, and the second surround 2214 protrudes away from the edge magnetic circuit 212; wherein the first surround 2212 protrudes towards the edge magnetic circuit 212, thereby expanding the space near the sound hole 11, which is helpful for the propagation of sound. In addition, the second surround 2214 protrudes away from the edge magnetic circuit 212, thereby providing space for the setting of the peripheral portion 21121, enabling the peripheral portion 21121 to have a corresponding installation space for setting, so that the volume of the second central magnet 2112 can be increased by adding the peripheral portion 21121, and further improving the acoustic performance of the sound generating device 100.

[0045] Please refer to Figure 3 and Figure 8 , in some embodiments, the diaphragm 221 further includes a reinforcing portion 2216, and the reinforcing portion 2216 is provided on the side of the flat portion 2213 facing the voice coil 222; by providing the reinforcing portion 2216, the structural strength of the flat portion 2213 of the diaphragm 221 can be effectively enhanced, thereby improving the connection stability of the voice coil 222. When the voice coil 222 drives the diaphragm 221 to vibrate, problems such as tearing of the diaphragm 221 can be avoided.

[0046] In some embodiments, the connecting portion 2211, the first surround 2212, the flat portion 2213, the second surround 2214, and the inner ring portion 2215 are an integrally formed structure. The integrally formed structure of the connecting portion 2211, the first surround 2212, the flat portion 2213, the second surround 2214, and the inner ring portion 2215 ensures the vibration performance and structural strength of the diaphragm 221.

[0047] Please refer to Figure 1 and Figure 4, in some embodiments, the sounding element 2 further includes an annular bracket 23. The side magnetic circuit 212 includes a side magnet 2121 and a side magnetic conductive plate 2122, and the side magnet 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. Among them, the annular bracket 23 is injection-molded and combined with the side magnetic conductive plate 2122; alternatively, the annular bracket 23 is formed by bending and extending from the peripheral edge of the side magnetic conductive plate 2122. In this embodiment, by providing the annular bracket 23, reliable support is provided for the side magnet. 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; among them, the annular bracket 23 can be a rectangular frame or a circular frame, which is not limited here; the annular bracket 23 can be a bracket with an integral structure or a bracket formed by splicing multiple structural members, which is also not limited here; among them, the annular bracket 23 is injection-molded and combined with the side magnetic conductive plate 2122, or the annular bracket 23 is formed by bending and extending from the peripheral edge of the side magnetic conductive plate 2122, that is, the annular bracket 23 and the side magnetic conductive plate 2122 are a structural member, so that it is easy to assemble and simplifies the assembly process. Among them, the side magnet 2121 can be a whole annular magnet, and the annular magnet is arranged around the central magnetic circuit 211, or the number of side magnets 2121 is multiple, and multiple side magnets 2121 are arranged around the central magnetic circuit 211, which is not limited here.

[0048] Please refer to Figure 13 and Figure 14 , according to an embodiment of the present invention, the side magnet 2121 is magnetized along the first direction, and the magnetization direction of the side magnet 2121 is opposite to the magnetization direction of the first central magnet 2111, so that a closed magnetic field line can be formed, improving the driving force on the voice coil 222, and further improving the acoustic performance of the sounding device 100. In addition, the upper and lower side magnets 2121 are symmetrically arranged relative to the housing 1, and the magnetization directions are opposite, which is more conducive to the concentrated distribution of magnetic induction lines, reducing magnetic leakage and improving the FR performance.

[0049] Please refer to Figure 9 , according to another embodiment of the present invention, the number of side magnets 2121 is multiple. The multiple side magnets 2121 include two first side magnets 21211 spaced along the second direction and two second side magnets 21212 spaced along the third direction. The two first side magnets 21211 and the two second side magnets 21212 are arranged around the periphery of the central magnetic circuit 211 and are spaced from the central magnetic circuit 211 to form a magnetic gap 214, and an avoidance space for avoiding the centering support piece 224 is formed between any adjacent first side magnet 21211 and second side magnet 21212; among them, the number of side magnetic conductive plates 2122 is also multiple, and each side magnetic conductive plate 2122 is arranged corresponding to one side magnet.

[0050] Please refer to Figure 2 ,Figure 10 and Figure 11 In some embodiments, each vibration system 22 further includes a framework 223. The framework 223 includes an annular main body portion 2231 and a plurality of fixing portions 2232. The annular main body portion 2231 is connected between the diaphragm 221 and the voice coil 222, and the plurality of fixing portions 2232 are arranged at intervals in sequence along the circumferential direction of the annular main body portion 2231. Each vibration system 22 further includes a centering washer 224. The centering washer 224 includes a first connecting portion 2241 connected to the fixing portion 2232, a second connecting portion 2242 connected to the annular bracket 23 or the edge magnetic circuit 212, and a spring arm portion 2243 connecting the first connecting portion 2241 and the second connecting portion 2242. By providing the framework 223, the annular main body portion 2231 of the framework 223 is respectively connected to the flat portion 2213 and the voice coil 222, so as to limit the position of the voice coil 222 at the position corresponding to the central magnet 2113 as much as possible, so that the voice coil 222 can be located at the gathering place of the magnetic induction lines, thereby improving the acoustic performance of the sound generating device 100. By providing the centering washer 224, the movement direction of the voice coil 222 is restricted, so that it always moves along the first direction, avoiding the phenomenon that the voice coil 222 tilts or deviates 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 on one first connecting portion 2241, or at least one of the multiple fixing portions 2232 can be fixed on one first connecting portion 2241, and no specific limitation is made here.

[0051] Please refer to Figure 4 and Figure 11 According to an embodiment of the present invention, the number of centering washers 224 is multiple, and the multiple centering washers 224 are arranged in sequence along the circumferential direction of the annular bracket 23. By providing multiple centering washers 224, the movement direction of the voice coil 222 can be restricted more effectively, avoiding the phenomenon that the voice coil 222 tilts or deviates from the track during vibration, and ensuring the stability of the vibration system 22. Specifically, the number of centering washers 224 is the same as the number of fixing portions 2232 and they are arranged in one-to-one correspondence.

[0052] The present invention also provides an electronic device (not shown in the figure), which includes a housing 200 and the above-mentioned sound generating device 100. The sound generating device 100 is disposed within the housing 200. The sound generating device 100 can be applied to 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. Among them, the sound generating device 100 is disposed within the housing 200, and a rear cavity 201 independent of the front cavity 3 is formed within the housing 200. The specific structure of the sound generating device 100 refers to the above-mentioned embodiments. Since the electronic device adopts all the technical solutions of the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated herein one by one.

[0053] The above is only an exemplary embodiment of the present invention, and thus does not limit the protection scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied to other related technical fields, is included in the protection scope of the present invention.

Claims

1. A sound generating device, characterized in that, including a housing; sound generating units, the number of the sound generating units being two, the two sound generating units being oppositely arranged on two sides of the housing along a first direction and enclosing a front cavity with the housing, and the housing being provided with sound holes communicating with the front cavity; each of the sound generating units includes a magnetic circuit system and a vibration system, and the two vibration systems are both connected to the housing; each of the magnetic circuit systems includes a magnetic yoke and a central magnetic circuit and an edge magnetic circuit arranged on the magnetic yoke, the edge magnetic circuit being arranged around the periphery of the central magnetic circuit and being spaced 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 that are sequentially stacked along the first direction, the first central magnetic steel being connected to the magnetic yoke, and one ends of the two second central magnetic steels facing away from the central magnetic steel abutting against each other; each of the vibration systems includes an annular diaphragm and a voice coil connected to the diaphragm and driving the diaphragm to vibrate along the first direction, the voice coil being located in the magnetic gap and corresponding to the central magnetic steel; the diaphragm has a through hole, and one end of the second central magnetic steel away from the central magnetic steel 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 generating units has a resonance cavity communicating with the front cavity.

2. The sound generating device according to claim 1, wherein At least one of the second central magnetic steels is provided with a resonance cavity communicating with the front cavity; and / or, the two second central magnetic steels are spliced to form a resonance cavity communicating with the front cavity.

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

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

5. The sound generating device according to claim 4, wherein, The second central magnetic steel includes a central portion and an outer peripheral portion arranged around the periphery of the central portion, and one side of the central portion facing away from the central magnetic steel protrudes from one side of the outer peripheral portion facing away from the central magnetic steel and protrudes into the through hole; wherein, the outer peripheral portion and the central portion are of an integrally formed structure or are independently arranged.

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 surround, a flat portion, a second surround, and an inner ring portion that are sequentially arranged in a surrounding manner from outside to inside. The connecting portion is connected to the housing. The inner ring portion surrounds the central magnetic circuit, and the inner ring portion is connected to the second central magnet.

7. The sound generating device according to claim 6, wherein The first surround bulges toward the edge magnetic circuit, and the second surround bulges away from the edge magnetic circuit. And / or, the diaphragm further includes a reinforcing portion, and the reinforcing portion is disposed on a side of the flat portion facing the voice coil. And / or, the connecting portion, the first surround, the flat portion, the second surround, and the inner ring portion are of an integrally formed structure. And / or, the voice coils of the two sound generating units are arranged oppositely in a first direction, and the sizes of the two voice coils are the same.

8. The sound generating device according to any one of claims 1 to 5, characterized in that, The sound generating unit further includes an annular bracket. The edge magnetic circuit includes an edge magnet and an edge magnetic conductive plate, and the edge magnet 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. Among them, the annular bracket is injection-molded and combined with the edge magnetic conductive plate; or, the annular bracket is formed by bending and extending from the periphery of the edge magnetic conductive plate.

9. The sound generating device according to claim 8, characterized in that, Each of the vibration systems further includes a skeleton, and the skeleton includes an annular main body portion and a plurality of fixing portions. The annular main body portion is connected between the diaphragm and the voice coil, and the plurality of fixing portions are sequentially arranged at intervals along the circumferential direction of the annular main body portion. Each of the vibration systems further includes a centering washer. The centering washer includes a first connecting portion connected to the fixing portion, a second connecting portion connected to the annular bracket or the edge magnetic circuit, and an elastic arm portion connecting the first connecting portion and the second connecting portion.

10. An electronic device, characterized in that, The electronic device includes a housing and a sound generating device according to any one of claims 1 to 9.

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