Sound generating device and electronic device

Abstract

The present invention discloses a sound generating device and an electronic device. The sound generating device includes a housing, a vibration system, and a magnetic circuit system. The vibration system includes a diaphragm assembly and a voice coil disposed in an installation cavity of the housing. The diaphragm assembly divides the installation cavity into a front sound cavity and a rear sound cavity. The voice coil is disposed in the rear sound cavity and is connected to the diaphragm assembly. A venting channel spaced from the front sound cavity and the rear sound cavity is provided in the diaphragm assembly. A first through hole communicating the venting channel and the front sound cavity is provided on a side of the diaphragm assembly facing the front sound cavity. A second through hole communicating the venting channel and the rear sound cavity is provided on a side of the diaphragm assembly facing the rear sound cavity. The vertical projections of the first through hole and the second through hole on the diaphragm assembly do not coincide. The magnetic circuit system includes a first magnetic circuit portion disposed in the rear sound cavity. The first magnetic circuit portion is opposite to and spaced from the voice coil. The present invention provides a sound generating device that can effectively improve the sound quality and enhance the high-frequency effect, enabling the sound generating device to maintain stable frequency response performance in a high-temperature and high-humidity environment.

Description

Technical Field

[0001] The present invention relates to the technical field of electroacoustic conversion, and particularly relates to a sound generating device and an electronic device applying the sound generating device. Background Art

[0002] A loudspeaker, also known as a speaker, as an electroacoustic transducer, is widely used in electronic devices such as speakers, headphones, and mobile phones. Current loudspeakers can be classified into moving coil loudspeakers, moving iron loudspeakers, and planar diaphragm loudspeakers in terms of working principle.

[0003] In related technologies, in order to pursue higher sound quality, electronic devices such as headphones often use multiple drive units, that is, a high-frequency loudspeaker is used in cooperation with a low-frequency loudspeaker. However, the size of the high-frequency loudspeaker is getting smaller and smaller. At present, the product structure design is limited by the external dimensions, and it is impossible to normally open a sound leakage hole that meets the usage requirements of the high-frequency loudspeaker, so that the rear cavity of the high-frequency loudspeaker cannot be vented. However, the airtightness of the rear cavity cannot be guaranteed and cannot be detected. When the airtightness is unstable, performance dispersion and instability will occur, and after reliability tests in environments such as high temperature and high humidity, the air pressure in the rear cavity changes, causing the equilibrium position of the diaphragm to change, resulting in performance changes, thus leading to a decline in frequency response performance, affecting the sound quality of the electronic device and the user experience. Summary of the Invention

[0004] The main object of the present invention is to provide a sound generating device and an electronic device, aiming to provide a sound generating device that can effectively improve the sound quality and enhance the high-frequency effect, so that the sound generating device can maintain stable frequency response performance in high-temperature and high-humidity environments.

[0005] To achieve the above object, the present invention provides a sound generating device, which includes:

[0006] A housing, the housing is provided with an installation cavity;

[0007] A vibration system, the vibration system includes a diaphragm assembly and a voice coil disposed in the installation cavity. The diaphragm assembly divides the installation cavity into a front sound cavity and a rear sound cavity. The voice coil is disposed in the rear sound cavity and is connected to the diaphragm assembly to drive the diaphragm assembly to vibrate. A venting channel is provided in the diaphragm assembly and is spaced from the front sound cavity and the rear sound cavity. A first through hole communicating the venting channel and the front sound cavity is provided on one side of the diaphragm assembly facing the front sound cavity, and a second through hole communicating the venting channel and the rear sound cavity is provided on one side of the diaphragm assembly facing the rear sound cavity. The vertical projections of the first through hole and the second through hole on the diaphragm assembly do not coincide; and

[0008] A magnetic circuit system, the magnetic circuit system includes a first magnetic circuit part disposed in the rear sound cavity, and the first magnetic circuit part is opposite to and spaced from the voice coil.

[0009] In one embodiment, the first through hole and the second through hole are located at two ends of the air leakage channel;

[0010] Or, the second through hole is located between two ends of the air leakage channel.

[0011] In one embodiment, there are multiple air leakage channels, one ends of the multiple air leakage channels are all communicated with the second through hole, and the other ends of the multiple air leakage channels extend in a direction away from the second through hole;

[0012] There are multiple first through holes, and each first through hole correspondingly communicates with one end of an air leakage channel away from the second through hole.

[0013] In one embodiment, the air leakage channel extends linearly;

[0014] Or, the air leakage channel extends in an arc line or a wavy line;

[0015] Or, the air leakage channel is connected and extended by at least two of a straight line segment, an arc line segment and a broken line segment.

[0016] In one embodiment, define the width of the air leakage channel as d1, and d1≤0.5mm;

[0017] And / or, define the depth of the air leakage channel as d2, and d2≤0.1mm.

[0018] In one embodiment, the diaphragm assembly includes a diaphragm and a dome. The diaphragm includes a central portion, a surround portion surrounding the central portion, and a fixing portion connected to the outside of the surround portion. The fixing portion is connected to the housing. The dome is connected to the central portion. An air leakage channel is provided between the dome and the central portion. The first through hole is provided in the central portion. The second through hole is provided in the dome. The voice coil is connected to a side of the dome facing away from the central portion.

[0019] In one embodiment, a groove communicating with the second through hole is concavely provided on a side of the dome facing the central portion. The central portion and the groove enclose to form the air leakage channel. At least a part of the vertical projection of the first through hole on the dome coincides with the groove.

[0020] In one embodiment, a groove communicating with the first through hole is concavely provided on a side of the central portion facing the dome. The dome and the groove enclose to form the air leakage channel. At least a part of the projection of the second through hole on the central portion coincides with the groove.

[0021] In one embodiment, the diaphragm assembly further includes an adhesive layer provided between the central portion and the dome;

[0022] The adhesive layer is provided with an air leakage through groove, and the central part, the air leakage through groove and the dome enclose to form the air leakage channel;

[0023] Or, the adhesive layer and the dome enclose to form the air leakage channel, the adhesive layer is provided with a third through hole corresponding to the first through hole, and the third through hole communicates with the air leakage channel;

[0024] Or, the adhesive layer and the central part enclose to form the air leakage channel, the adhesive layer is provided with a third through hole corresponding to the second through hole, and the third through hole communicates with the air leakage channel.

[0025] In one embodiment, the extension length of the air leakage channel is greater than or equal to 0.1 mm;

[0026] And / or, the extension length of the air leakage channel is less than or equal to twice the perimeter of the dome.

[0027] In one embodiment, the first through hole is a circular hole, an oval hole, a triangular hole, a square hole or a special-shaped hole;

[0028] And / or, the second through hole is a circular hole, an oval hole, a triangular hole, a square hole or a special-shaped hole;

[0029] And / or, the cross section of the air leakage channel is semi-circular, U-shaped, V-shaped, W-shaped or wedge-shaped.

[0030] In one embodiment, the magnetic circuit system further includes a second magnetic circuit part, and the second magnetic circuit part is arranged in the front sound cavity.

[0031] In one embodiment, the housing includes:

[0032] A first housing, the first housing is provided with a first installation groove, and the first magnetic circuit part is arranged in the first installation groove; and

[0033] A second housing, the second housing is provided with a second installation groove, and the second magnetic circuit part is arranged in the second installation groove. The second housing is connected to the first housing so that the second installation groove and the first installation groove enclose to form the installation cavity;

[0034] Wherein, the periphery of the diaphragm assembly is clamped between the first housing and the second housing so that the diaphragm assembly and the first installation groove enclose to form the rear sound cavity, and the diaphragm assembly and the second installation groove enclose to form the front sound cavity.

[0035] In one embodiment, the first magnetic circuit part includes at least three first magnetic members arranged in a horizontal direction;

[0036] The first magnetic member located at the middle position is magnetized in the vertical direction, and the magnetization directions of two adjacent first magnetic members are opposite to each other;

[0037] And / or, a connecting member is provided between two adjacent first magnetic members to define an assembly gap between the two first magnetic members; or, two adjacent first magnetic members are arranged in abutting contact with each other.

[0038] The present invention further provides an electronic device, including a device housing and the sound generating device described above, and the sound generating device is arranged inside the device housing.

[0039] The sound generating device of the technical solution of the present invention is provided with an installation cavity inside the housing, so as to facilitate the installation and fixation of the vibration system and the magnetic circuit system by using the installation cavity. The diaphragm assembly of the vibration system divides the installation cavity into a front sound cavity and a rear sound cavity, and the voice coil is wired along the surface of the diaphragm assembly. The first magnetic circuit part of the magnetic circuit system is arranged in the rear sound cavity and is opposite to the voice coil, so as to generate a strong magnetic field by using the first magnetic circuit part, so that the diaphragm and the voice coil are in a strong magnetic field intensity, and the magnetic induction lines at the diaphragm are evenly distributed and the change of the magnetic field intensity has good linearity, which can effectively improve the sound quality of the audio output by the sound generating device and improve the treble effect; at the same time, by arranging an air leakage channel in the diaphragm assembly and respectively arranging a first through hole and a second through hole on opposite sides of the diaphragm assembly, the air leakage channel is communicated with the front sound cavity through the first through hole, and the air leakage channel is communicated with the rear sound cavity through the second through hole, so as to realize air leakage of the rear sound cavity by using the cooperation of the second through hole, the air leakage channel and the first through hole, ensure that the air pressure in the rear sound cavity is consistent with the external air pressure, so as to ensure that the frequency response performance of the sound generating device is stable in a high-temperature and high-humidity environment. Description of the Drawings

[0040] 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 use in 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, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0041] Figure 1 It is a schematic structural diagram of a sound generating device in an embodiment of the present invention;

[0042] Figure 2 It is an exploded schematic diagram of a sound generating device in an embodiment of the present invention;

[0043] Figure 3 It is a schematic cross-sectional diagram of a sound generating device in an embodiment of the present invention;

[0044] Figure 4 For Figure 3Enlarged schematic view at position A in [Chinese term];

[0045] Figure 5 Exploded schematic view of the diaphragm assembly in an embodiment of the present invention;

[0046] Figure 6 Exploded schematic view of the diaphragm assembly in another embodiment of the present invention;

[0047] Figure 7 Exploded schematic view of the diaphragm assembly in yet another embodiment of the present invention;

[0048] Figure 8 Exploded schematic view of the diaphragm assembly in still another embodiment of the present invention.

[0049] Explanation of the reference numerals in the drawings:

[0050]

[0051]

[0052] The realization of the object, functional features and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0053] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to 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 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.

[0054] It should be noted that all the directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0055] At the same time, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three scenarios. Taking "A and / or B" as an example, it includes the scenario of A, or the scenario of B, or the scenario where A and B are satisfied simultaneously.

[0056] In addition, in the present invention, descriptions such as "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, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. 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.

[0057] A loudspeaker, also known as a speaker, as an electroacoustic transducer, is widely used in electronic devices such as speakers, headphones, mobile phones, etc. Current loudspeakers can be classified into dynamic loudspeakers, moving iron loudspeakers, and planar diaphragm loudspeakers from the working principle.

[0058] In related technologies, in order to pursue higher sound quality, electronic devices such as headphones often use multiple drive units, that is, a high-frequency loudspeaker and a low-frequency loudspeaker are used in cooperation. However, the size of the high-frequency loudspeaker is getting smaller and smaller. Currently, the product structure design is limited by the external dimensions and it is impossible to normally open a sound leakage hole that meets the usage requirements of the high-frequency loudspeaker, so that the rear cavity of the high-frequency loudspeaker cannot be vented, resulting in a pressure difference between the rear cavity and the front cavity. In this way, in a high-temperature and high-humidity environment, the frequency response performance will decline, thus affecting the sound quality of the electronic device and the user's usage effect.

[0059] At the same time, the sealing performance of the rear cavity cannot be guaranteed and cannot be detected. When the sealing performance is unstable, performance dispersion and instability phenomena will occur, and after reliability tests in environments such as high temperature and high humidity, the air pressure in the rear cavity changes, causing the equilibrium position of the diaphragm to change, resulting in performance changes, thus leading to a decline in the frequency response performance, affecting the sound quality of the electronic device and the user's usage effect.

[0060] Based on the above concepts and problems, the present invention proposes a sound generating device 100. It can be understood that the sound generating device 100 can be applied to electronic devices such as speakers, headphones, mobile phones, etc., and is not limited herein.

[0061] Please refer to Figures 1 to 8As shown, in the embodiment of the present invention, the sound generating device 100 includes a housing 1, a vibration system 2, and a magnetic circuit system 3. Among them, the housing 1 is provided with an installation cavity 11. The vibration system 2 includes a diaphragm assembly 21 and a voice coil 22 disposed in the installation cavity 11. The diaphragm assembly 21 divides the installation cavity 11 into a front sound cavity 15 and a rear sound cavity 16. The voice coil 22 is disposed in the rear sound cavity 16 and is connected to the diaphragm assembly 21 to drive the diaphragm assembly 21 to vibrate. A venting channel 211 spaced from the front sound cavity 15 and the rear sound cavity 16 is provided in the diaphragm assembly 21. A first through hole 2124 communicating the venting channel 211 and the front sound cavity 15 is provided on one side of the diaphragm assembly 21 facing the front sound cavity 15. A second through hole 2131 communicating the venting channel 211 and the rear sound cavity 16 is provided on one side of the diaphragm assembly 21 facing the rear sound cavity 16. The vertical projections of the first through hole 2124 and the second through hole 2131 on the diaphragm assembly 21 do not coincide. The magnetic circuit system 3 includes a first magnetic circuit portion 31 disposed in the rear sound cavity 16. The first magnetic circuit portion 31 is opposite to and spaced from the voice coil 22.

[0062] In this embodiment, the housing 1 is used to install, fix, support, and protect components such as the vibration system 2 and the magnetic circuit system 3. That is, the housing 1 provides an installation foundation for components such as the vibration system 2 and the magnetic circuit system 3. It can be understood that the housing 1 can be a structure such as an installation shell, a housing, or a box body having an installation cavity 11, which is not limited herein.

[0063] In this embodiment, the housing 1 can be set to a circular or square structure, etc., which is not limited herein. The housing 1 includes a first housing 12 and a second housing 13 that cooperates with the first housing 12, so that the first housing 12 and the second housing 13 enclose to form the installation cavity 11. It can be understood that the second housing 13 can be set in a U-shaped structure, which can include a flat bottom wall and side walls provided on the bottom wall. The first housing 12 can also be set in a U-shaped structure, which can include a flat top wall and side walls respectively provided on the top wall. In this way, the first housing 12 and the second housing 13 are cross-fastened together to define the installation cavity 11 for installing components such as the vibration system 2 and the magnetic circuit system 3. Of course, in other embodiments, the second housing 13 can also be a flat plate structure, which is not limited herein.

[0064] It can be understood that the vibration system 2 includes a diaphragm assembly 21 and a voice coil 22. The voice coil 22 is disposed on the diaphragm assembly 21. The diaphragm assembly 21 can be selected as a flat diaphragm structure, so that the voice coil 22 is disposed on the flat surface of the diaphragm assembly 21. In this embodiment, the voice coil 22 can be a flexible circuit board attached to the diaphragm assembly 21. The voice coil 22 can also be composed of a plurality of coils disposed on the same surface of the diaphragm assembly 21, which is not limited herein.

[0065] In this embodiment, the magnetic circuit system 3 includes a first magnetic circuit portion 31 disposed in the rear sound cavity 16. The diaphragm assembly 21 and the voice coil 22 of the vibration system 2 are within the magnetic field strength formed by the first magnetic circuit portion 31, so that the magnetic induction line distribution at the diaphragm assembly 21 is uniform and the change in magnetic field strength has good linearity, which can effectively improve the sound quality of the audio output by the sound generating device 100 and enhance the treble effect.

[0066] In one embodiment, the voice coil 22 is wired along the surface of the diaphragm assembly 21 and is opposite to the first magnetic circuit portion 31, and the central axis of the voice coil 22 is perpendicular to the diaphragm assembly 21. The voice coil 22 has at least a first wire segment and a second wire segment disposed opposite to each other, and the current directions in the first wire segment and the second wire segment are opposite. In this way, the diaphragm assembly 21 and the voice coil 22 are located in the magnetic field formed by the first magnetic circuit portion 31, so as to generate a magnetic force acting on the voice coil 22 when a current is passed through the voice coil 22, and then drive the diaphragm assembly 21 to vibrate reciprocally in the direction of the magnetic force to generate sound. It can be understood that after a current is passed through the voice coil 22, the current flow directions in the first wire segment and the second wire segment of the voice coil 22 disposed opposite to each other are opposite.

[0067] Optionally, the first magnetic circuit portion 31 of the magnetic circuit system 3 can be an electromagnet or a permanent magnet, but its magnetism remains unchanged.

[0068] In this embodiment, as Figures 2 to 8 shown, by providing a venting channel 211 in the diaphragm assembly 21, the venting channel 211 is spaced from the front sound cavity 15 and the rear sound cavity 16, and first through holes 2124 and second through holes 2131 are provided on two opposite surfaces of the diaphragm assembly 21. That is, a first through hole 2124 is provided on the side of the diaphragm assembly 21 facing the front sound cavity 15, and a second through hole 2131 is provided on the side of the diaphragm assembly 21 facing the rear sound cavity 16, so that the first through hole 2124 communicates the venting channel 211 and the front sound cavity 15, and the second through hole 2131 communicates the venting channel 211 and the rear sound cavity 16, thereby realizing the communication of the rear sound cavity 16 with the front sound cavity 15 through the cooperation of the second through hole 2131, the venting channel 211 and the first through hole 2124, and further communicating with the outside atmosphere through the front sound cavity 15 to keep the air pressures of the rear sound cavity 16, the front sound cavity 15 and the outside atmosphere consistent, so as to ensure the stable frequency response performance of the sound generating device 100 in a high-temperature and high-humidity environment.

[0069] The sound generating device 100 of the present invention is provided with an installation cavity 11 inside the housing 1, thereby facilitating the installation and fixation of the vibration system 2 and the magnetic circuit system 3 by using the installation cavity 11. The diaphragm assembly 21 of the vibration system 2 divides the installation cavity 11 into a front sound cavity 15 and a rear sound cavity 16, and the voice coil 22 is wired along the surface of the diaphragm assembly 21. The first magnetic circuit part 31 of the magnetic circuit system 3 is disposed in the rear sound cavity 16 and is opposite to the voice coil 22. Thus, a strong magnetic field is generated by the first magnetic circuit part 31, so that the diaphragm assembly 21 and the voice coil 22 are in a strong magnetic field intensity, and the magnetic induction lines at the diaphragm assembly 21 are evenly distributed and the change of the magnetic field intensity has good linearity, which can effectively improve the sound quality of the audio output by the sound generating device 100 and improve the treble effect. At the same time, by providing a venting channel 211 inside the diaphragm assembly 21 and respectively providing a first through hole 2124 and a second through hole 2131 on opposite sides of the diaphragm assembly 21, the venting channel 211 is communicated with the front sound cavity 15 through the first through hole 2124, and the venting channel 211 is communicated with the rear sound cavity 16 through the second through hole 2131. Thus, the rear sound cavity 16 is vented by the cooperation of the second through hole 2131, the venting channel 211 and the first through hole 2124, ensuring that the air pressure in the rear sound cavity 16 is consistent with the external air pressure, so as to ensure the stable frequency response performance of the sound generating device 100 in a high temperature and high humidity environment.

[0070] It can be understood that the sound generating device 100 of the present invention realizes the micro-leakage of the rear sound cavity 16 through the cooperation of the second through hole 2131, the venting channel 211 and the first through hole 2124, effectively improving the reliability of the product, reducing the occurrence of defective phenomena in the whole machine, reducing product defects. The sound generating device 100 has strong feasibility and high mass production performance.

[0071] Optionally, the first through hole 2124 and the second through hole 2131 are located at both ends of the venting channel 211. Of course, in other embodiments, as Figure 2 、 Figures 5 to 8 shown, the second through hole 2131 is located between both ends of the venting channel 211. It can be understood that the second through hole 2131 divides the venting channel 211 into a plurality of segment channel structures.

[0072] In one embodiment, as Figures 6 to 8 shown, the venting channel 211 includes a plurality of them. One ends of the plurality of venting channels 211 are all communicated with the second through hole 2131, and the other ends of the plurality of venting channels 211 extend in a direction away from the second through hole 2131; the first through hole 2124 includes a plurality of them, and each first through hole 2124 corresponds to and communicates with one end of a venting channel 211 away from the second through hole 2131. Thus, by providing a plurality of venting channels 211, the equalizing effect between the rear sound cavity 16 and the outside can be improved, and further the sound generating effect of the sound generating device 100 can be improved.

[0073] It can be understood that a plurality of air leakage channels 211 are arranged at intervals along the circumferential direction of the second through hole 2131. Optionally, the plurality of air leakage channels 211 are arranged radially along the circumferential direction of the second through hole 2131, which is not limited herein. Optionally, the air leakage channel 211 is arranged to extend linearly; or, the air leakage channel 211 is arranged to extend in an arc shape or a wavy line or a spiral shape; or, the air leakage channel 211 is arranged to extend by connecting at least two of a straight line segment, an arc segment, and a broken line segment. In this embodiment, the extending shapes of the plurality of air leakage channels 211 may be the same or different, which is not limited herein.

[0074] In order to adjust and control the leakage amount of the rear sound cavity 16 to adjust the frequency response performance and sound quality effect of the sound generating device 100. In one embodiment, as Figure 4 shown, the width of the air leakage channel 211 is defined as d1, and d1 ≤ 0.5 mm. It can be understood that the width d1 of the air leakage channel 211 is the width perpendicular to the extending direction of the air leakage channel 211 and parallel to the plane where the diaphragm assembly 21 is located. Optionally, the width d1 of the air leakage channel 211 is 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm.

[0075] It can be understood that when the air leakage channel 211 includes a plurality of channels, the width d1 of each air leakage channel 211 ≤ 0.5 mm. Optionally, the widths of the plurality of air leakage channels 211 may be the same or different, which is not limited herein.

[0076] In order to adjust and control the leakage amount of the rear sound cavity 16 to adjust the frequency response performance and sound quality effect of the sound generating device 100. In one embodiment, the depth of the air leakage channel 211 is defined as d2, and d2 ≤ 0.1 mm. The depth d2 of the air leakage channel 211 is the depth of the air leakage channel 211 along the vibration direction of the diaphragm assembly 21. Optionally, the depth d2 of the air leakage channel 211 is 0.3 mm, 0.4 mm, 0.5 mm, 0.8 mm, 0.1 mm, etc., which is not limited herein.

[0077] It can be understood that when the air leakage channel 211 includes a plurality of channels, the depth d2 of each air leakage channel 211 ≤ 0.1 mm. Optionally, the depths of the plurality of air leakage channels 211 may be the same or different, which is not limited herein.

[0078] In this embodiment, by controlling and adjusting the width d1 of the air leakage channel 211 ≤ 0.5 mm and the depth d2 of the air leakage channel 211 ≤ 0.1 mm, the leakage amount of the rear sound cavity 16 can be ensured to be stable, and the problem of the reliability FR drop can be improved.

[0079] Optionally, the first through hole 2124 is a circular hole, an oval hole, a triangular hole, a square hole or other polygonal holes or irregular holes, etc., which are not limited herein. Optionally, the second through hole 2131 is a circular hole, an oval hole, a triangular hole, a square hole or other polygonal holes or irregular holes, etc., which are not limited herein. Optionally, the cross-section of the air leakage channel 211 is circular, semi-circular, U-shaped, V-shaped, W-shaped or wedge-shaped, etc., which are not limited herein.

[0080] In one embodiment, as Figure 3 and Figure 4 shown, the diaphragm assembly 21 includes a diaphragm 212 and a dome 213. An air leakage channel 211 is provided between the diaphragm 212 and the dome 213. The diaphragm 212 is provided with a first through hole 2124, and the dome 213 is provided with a second through hole 2131. The voice coil 22 is connected to a side of the dome 213 facing away from the central portion 2121.

[0081] It can be understood that the diaphragm 212 can be a flat diaphragm structure or a diaphragm structure with a surround 2122. In this embodiment, the voice coil 22 can be a flexible circuit board attached to the dome 213. The voice coil 22 can also be composed of a plurality of coils provided on the same surface of the dome 213, which are not limited herein.

[0082] Of course, in other embodiments, the dome 213 can also be disposed on a side of the diaphragm 212 facing away from the voice coil 22, which is not limited herein.

[0083] In order to adjust and control the leakage amount of the rear sound cavity 16 to adjust the frequency response performance and sound quality effect of the sound generating device 100. In one embodiment, the extension length of the air leakage channel 211 is greater than or equal to 0.1 mm. It can be understood that the air leakage channel 211 can be optionally arranged in a straight line, a wavy line, an arc curve or a spiral shape, which are not limited herein.

[0084] In this embodiment, the extension length of the air leakage channel 211 is the extension length of the air leakage channel 211 from the first through hole 2124 to the second through hole 2131. When the air leakage channel 211 is a straight channel, in order to further ensure the frequency response performance and sound quality effect of the sound generating device 100, the extension length of the air leakage channel 211 is less than or equal to twice the circumference of the dome 213.

[0085] In one embodiment, the diaphragm 212 includes a central portion 2121, a surround 2122 disposed around the central portion 2121, and a fixing portion 2123 connected to the outside of the surround 2122. The fixing portion 2123 is connected to the housing 1. The dome 213 is connected to the central portion 2121. An air leakage channel 211 is provided between the dome 213 and the central portion 2121. The central portion 2121 is provided with a first through hole 2124, and the dome 213 is provided with a second through hole 2131. The voice coil 22 is connected to a side of the dome 213 facing away from the central portion 2121.

[0086] In this embodiment, as Figure 2 and Figure 8 shown, the fixing portion 2123 of the diaphragm 212 is connected to the housing 1. Optionally, the fixing portion 2123 of the diaphragm 212 is clamped between the first housing 12 and the second housing 13 of the housing 1, which can not only improve the installation stability of the diaphragm 212, but also increase the effective vibration area of the diaphragm 212 and improve the pronunciation effect of the sound generating device 100.

[0087] It can be understood that the surround portion 2122 of the diaphragm 212 can be convex upward or downward. In this embodiment, the surround portion 2122 protrudes into the rear sound cavity 16. Optionally, the extending direction of the fixing portion 2123 is opposite to the protruding direction of the surround portion 2122. This can avoid interference of the second housing 13 with the vibration of the surround portion 2122.

[0088] In this embodiment, the dome 213 is disposed between the central portion 2121 and the voice coil 22. It can be understood that by providing the dome 213, the central portion 2121 of the diaphragm 212 can be strengthened by the dome 213 to improve the vibration effect. The hardness of the dome 213 is greater than that of the diaphragm 212 to enhance the overall rigidity of the surface of the diaphragm 212, so that the surface of the diaphragm 212 has as consistent a vibration amplitude as possible, and the diaphragm 212 exhibits overall piston vibration.

[0089] Optionally, the shape of the dome 213 can be circular. Of course, the shape of the dome 213 can also be strip-shaped, comb-shaped, etc. In one embodiment, a plurality of domes 213 are provided on the diaphragm 212, and the extending direction of the domes 213 intersects with the voice coil 22, optionally perpendicular, so as to form a cross-grid shape. The voice coil 22 can also play a role in enhancing the overall rigidity of the surface of the diaphragm 212. The voice coil 22 and the domes 213 together enhance the overall rigidity of the surface of the diaphragm 212.

[0090] In this embodiment, when the air release channels 211 include a plurality, the central portion 2121 is provided with a plurality of first through holes 2124. The number of the first through holes 2124 is the same as the number of the air release channels 211. Of course, the dome 213 is provided with at least one second through hole 2131. Optionally, the dome 213 is provided with a plurality of second through holes 2131, which is not limited herein.

[0091] It can be understood that at least one first through hole 2124 and one second through hole 2131 are connected to one air release channel 211, which is not limited herein.

[0092] In one embodiment, as Figure 4 、 Figures 6 to 8As shown, on the side of the dome 213 facing the central part 2121, a groove 2132 communicating with the second through-hole 2131 is recessed, and the central part 2121 and the groove 2132 enclose an air leakage channel 211. At least a part of the vertical projection of the first through-hole 2124 on the dome 213 coincides with the groove 2132.

[0093] It can be understood that the groove 2132 on the dome 213 can be formed by a grooving design. Of course, the groove 2132 on the dome 213 can also be formed into a concave structure by a stamping and integral forming process, which is not limited herein.

[0094] In this embodiment, the cross-section of the groove 2132 can be selected as semi-circular, U-shaped, V-shaped, W-shaped or wedge-shaped, etc., which is not limited herein. When the dome 213 and the diaphragm 212 are connected as a whole, at least a part of the first through-hole 2124 communicates with the groove 2132 correspondingly.

[0095] In one embodiment, on the side of the central part 2121 facing the dome 213, a groove 2132 communicating with the first through-hole 2124 is recessed, and the dome 213 and the groove 2132 enclose an air leakage channel 211. At least a part of the vertical projection of the second through-hole 2131 on the central part 2121 coincides with the groove 2132.

[0096] It can be understood that the groove 2132 in the central part 2121 of the diaphragm 212 can be formed by stamping or injection molding, which is not limited herein. In this embodiment, the cross-section of the groove 2132 can be selected as semi-circular, U-shaped, V-shaped, W-shaped or wedge-shaped, etc., which is not limited herein. When the dome 213 and the diaphragm 212 are connected as a whole, at least a part of the second through-hole 2131 communicates with the groove 2132 correspondingly.

[0097] Of course, on the side of the dome 213 facing the central part 2121, a groove 2132 communicating with the second through-hole 2131 is recessed, and on the side of the central part 2121 facing the dome 213, a groove 2132 communicating with the first through-hole 2124 is recessed. When the dome 213 and the diaphragm 212 are connected as a whole, the groove 2132 on the surface of the dome 213 and the groove 2132 on the surface of the central part 2121 enclose an air leakage channel 211, which is not limited herein.

[0098] In one embodiment, the diaphragm assembly 21 further includes an adhesive layer 214 disposed between the central part 2121 and the dome 213. It can be understood that by providing the adhesive layer 214, it is convenient for the dome 213 to be connected with the central part 2121 of the diaphragm 212 as an integral structure through the adhesive layer 214.

[0099] In one embodiment, as Figure 2 and Figure 5As shown, the adhesive layer 214 is provided with an air leakage groove 2141. The central part 2121, the air leakage groove 2141 and the dome 213 enclose an air leakage channel 211. It can be understood that the air leakage groove 2141 is arranged through the adhesive layer 214. The air leakage groove 2141 extends linearly, arc-shaped, wavy, or zigzag; or, the air leakage groove 2141 is formed by at least two combinations of straight lines, arcs, and broken lines, which is not limited herein.

[0100] Optionally, the first through hole 2124 is arranged through the central part 2121 of the diaphragm 212, and the second through hole 2131 is arranged through the dome 213.

[0101] In one embodiment, as Figures 6 to 8 shown, the adhesive layer 214 and the dome 213 enclose an air leakage channel 211. The adhesive layer 214 is provided with a third through hole 2142 corresponding to the first through hole 2124, and the third through hole 2142 communicates with the air leakage channel 211.

[0102] It can be understood that the third through hole 2142 is arranged through the adhesive layer 214, and the third through hole 2142 is coaxially arranged with the first through hole 2124 and correspondingly communicates. Optionally, the third through hole 2142 is a circular hole, an oval hole, a triangular hole, a square hole or other polygonal holes or special-shaped holes, etc., which is not limited herein.

[0103] In one embodiment, the adhesive layer 214 and the central part 2121 enclose an air leakage channel 211. The adhesive layer 214 is provided with a third through hole 2142 corresponding to the second through hole 2131, and the third through hole 2142 communicates with the air leakage channel 211.

[0104] It can be understood that the third through hole 2142 is arranged through the adhesive layer 214, and the third through hole 2142 is coaxially arranged with the second through hole 2131 and correspondingly communicates. Optionally, the third through hole 2142 is a circular hole, an oval hole, a triangular hole, a square hole or other polygonal holes or special-shaped holes, etc., which is not limited herein.

[0105] In one embodiment, the magnetic circuit system 3 further includes a second magnetic circuit part 32, and the second magnetic circuit part 32 is arranged in the front sound cavity 15.

[0106] In this embodiment, as Figure 2 and Figure 3As shown, by arranging the first magnetic circuit part 31 and the second magnetic circuit part 32 on the opposite sides of the diaphragm assembly 21, the first magnetic circuit part 31 and the second magnetic circuit part 32 form a strong magnetic field on the opposite sides of the diaphragm assembly 21 and the voice coil 22, so that the diaphragm assembly 21 and the voice coil 22 of the vibration system 2 are within a strong magnetic field intensity, and the magnetic induction line distribution at the diaphragm 212 is uniform and the change of the magnetic field intensity has good linearity, which can effectively improve the sound quality of the audio output by the sound generating device 100 and improve the treble effect.

[0107] Optionally, the first magnetic circuit part 31 of the magnetic circuit system 3 can be an electromagnet or a permanent magnet, but its magnetism remains unchanged. The second magnetic circuit part 32 can be an electromagnet or a permanent magnet, but its magnetism remains unchanged.

[0108] In one embodiment, the housing 1 includes a first housing 12 and a second housing 13. The first housing 12 is provided with a first installation groove 121, and the first magnetic circuit part 31 is arranged in the first installation groove 121. The second housing 13 is provided with a second installation groove 131, and the second magnetic circuit part 32 is arranged in the second installation groove 131. The second housing 13 is connected to the first housing 12 so that the second installation groove 131 and the first installation groove 121 enclose an installation cavity 11; wherein, the periphery of the diaphragm assembly 21 is clamped between the first housing 12 and the second housing 13, so that the diaphragm assembly 21 and the first installation groove 121 enclose a rear sound cavity 16, and the diaphragm assembly 21 and the second installation groove 131 enclose a front sound cavity 15.

[0109] In this embodiment, as Figures 1 to 3 shown, by setting the housing 1 into a two-part structure of the first housing 12 and the second housing 13, it is convenient to assemble components such as the vibration system 2 and the magnetic circuit system 3. It can be understood that the first housing 12 and the second housing 13 can be fixedly connected into an integral structure by means of welding, bonding and other sealing fits, so as to improve the connection stability and sealing performance of the first housing 12 and the second housing 13.

[0110] Of course, in other embodiments, the first housing 12 and the second housing 13 can also be connected into an integral structure by means of detachable connection methods such as snap connection, plug-in fit, screw connection or pin connection, so as to facilitate the disassembly, assembly or replacement of components such as the vibration system 2 and the magnetic circuit system 3. When the first housing 12 and the second housing 13 are connected into an integral body, the second installation groove 131 and the first installation groove 121 enclose an installation cavity 11.

[0111] It can be understood that by providing a first mounting groove 121 in the first housing 12, the first magnetic circuit portion 31 is limited and mounted by the first mounting groove 121, and a second mounting groove 131 is provided in the second housing 13, so that the second magnetic circuit portion 32 is limited and mounted by the second mounting groove 131. In this embodiment, the air vent hole 121 penetrates through the wall of the first mounting groove 121.

[0112] In this embodiment, the periphery of the diaphragm 212 is clamped between the first housing 12 and the second housing 13, so that the diaphragm 212 and the first mounting groove 121 enclose a rear sound cavity 16, and the diaphragm 212 and the second mounting groove 131 enclose a front sound cavity 15. In this way, the mounting stability of the diaphragm 212 can be improved, and the space of the first mounting groove 121 and the second mounting groove 131 can be used to provide sufficient vibration space for the diaphragm 212.

[0113] In one embodiment, the first housing 12 includes an injection molded part and a metal part integrally injection molded. By setting the first housing 12 as an injection molded part and a metal part, the metal part is used as the main part of the bottom of the first housing 12. In this way, the first magnetic circuit portion 31 is fixed on the metal part, so as to improve the heat dissipation effect of the sound generating device 100 by the metal part, and effectively increase the volume of the rear sound cavity 16 of the sound generating device 100. Optionally, the metal part is a metal sheet, and can be formed into a bottom plate and a side plate integrally connected by bending or stamping, etc., which is not limited herein.

[0114] It can be understood that the injection molded part is a plastic part, and the injection molded part and the metal part can be integrally formed by an injection molding process. In this way, the structural strength of the first housing 12 can be improved, and the sealing effect of the first housing 12 can also be improved.

[0115] In one embodiment, the second housing 13 includes a central portion and an edge portion provided on the outer periphery of the central portion. The edge portion and the central portion enclose a second mounting groove 131. The edge portion extends bent away from the second magnetic circuit portion 32 relative to the central portion, so as to define a glue application groove with the side portion of the first housing 12, and the glue application groove is filled with sealing glue.

[0116] In this embodiment, as Figure 1 and Figure 3 shown, by setting the second housing 13 as a central portion and an edge portion, the edge portion is connected to the outer periphery of the central portion, so that the second mounting groove 131 is formed by enclosing the central portion and the edge portion. It can be understood that the second magnetic circuit portion 32 is fixed to the central portion. By bending and extending the edge portion away from the second magnetic circuit portion 32 relative to the central portion, when the second housing 13 is connected to the first housing 12 through the edge portion, the edge portion of the second housing 13 and the side portion of the second housing 13 define a glue application groove. Optionally, the edge portion is an L-shaped structure.

[0117] It can be understood that by filling the glue application groove with a sealing glue, and the sealing glue solidifies to form a seal, which can effectively improve the connection stability and sealing performance between the first housing 12 and the second housing 13.

[0118] In one embodiment, as Figure 2 shown, the voice coil 22 is formed in a square shape. It can be understood that by setting the voice coil 22 in a square structure, the voice coil 22 includes a first straight side and a second straight side connected in sequence, that is, the first wire segment and the second wire segment of the voice coil 22 are respectively two opposite first straight sides or two second straight sides. Such a setting makes the voice coil 22 effectively increase the magnetic flux compared with the traditional racetrack-shaped voice coil.

[0119] Optionally, there are two voice coils 22, and the two voice coils 22 are arranged on the upper and lower sides of the diaphragm 212. It can be understood that the voice coil 22 can be formed by printing, or vapor deposition, or 3D printing on the surface of the diaphragm 212. Only one surface of the diaphragm 212 can be provided with the voice coil 22, or both surfaces of the diaphragm 212 can be provided with the voice coil 22, which is not limited herein.

[0120] By passing an electric current through the voice coil 22 to drive the diaphragm 212 to vibrate in a predetermined direction and thus generate sound, wherein by continuously changing the current flow direction in the voice coil 22, the direction of the magnetic force received by the voice coil 22 is continuously changed, thereby controlling the reciprocating vibration of the diaphragm 212. It can be understood that the more the number of voice coils 22, the greater the magnetic force driving the diaphragm 212 to vibrate, and the higher the sensitivity of controlling the vibration of the diaphragm 212. However, it is also necessary to consider the size of the surface of the diaphragm 212 and the product specifications of the sound generating device 100, which are not limited herein.

[0121] In this embodiment, the wire material of the voice coil 22 can be metals such as aluminum, copper, nickel, gold, silver, or alloys of these metals, which is not limited herein.

[0122] Since only the part of the diaphragm 212 where the voice coil 22 is provided will receive the magnetic force, and the part where the voice coil 22 is not provided will not receive the magnetic force, the part of the diaphragm 212 where the voice coil 22 is provided and the part where the voice coil 22 is not provided will exhibit different segmented vibrations, that is, the vibration amplitude of the part of the diaphragm 212 where the voice coil 22 is provided is greater than that of the part where the voice coil 22 is not provided. In this way, it will cause peaks and valleys in the frequency response curve of the sound generating device 100, resulting in distortion of the audio output by the sound generating device 100, and ultimately deteriorating the acoustic performance of the sound generating device 100. In view of this, the vibration system 2 further includes a dome 213, and the dome 213 is arranged on the surface of the diaphragm 212.

[0123] In one embodiment, the housing 1 is further provided with a sound outlet hole 132 communicating with the front sound cavity 15, and the housing 1 further includes a sound nozzle 14 disposed at the sound outlet hole 132.

[0124] In this embodiment, as Figures 1 to 3 shown, the second housing 13 of the housing 1 is provided with a sound outlet hole 132 communicating with the front sound cavity 15. It can be understood that by providing the sound outlet hole 132 at the central part of the second housing 13, the sound generated by the vibration of the diaphragm 212 can be conveniently transmitted out of the housing 1 through the sound outlet hole 132. By providing the sound nozzle 16, the transmission effect can be improved.

[0125] In one embodiment, the first magnetic circuit part 31 includes at least three first magnetic members 311 arranged in a horizontal direction.

[0126] In this embodiment, as Figure 3 shown, the first magnetic member 311 can be an electromagnet or a permanent magnet, but its magnetism remains unchanged. Any adjacent first magnetic members 311 can be optionally arranged at intervals, or in contact, or connected by a connecting member, etc., which is not limited herein. It can be understood that the first magnetic member 311 located in the middle position is magnetized in the vertical direction, and the magnetization directions of two adjacent first magnetic members 311 are opposite.

[0127] Of course, the second magnetic circuit part 32 includes at least one second magnetic member, and the second magnetic member can be an electromagnet or a permanent magnet, but its magnetism remains unchanged. Any adjacent second magnetic members can be optionally arranged at intervals, or in contact, or connected by a connecting member, etc., which is not limited herein.

[0128] It can be understood that when one of the at least three first magnetic members 311 of the first magnetic circuit part 31 in the magnetic circuit system 3 is magnetized in the vertical direction, the magnetization directions of two adjacent first magnetic members 311 are opposite, that is, two first magnetic members 311 with opposite magnetization directions are arranged alternately, so as to form a magnetic member array and generate a magnetic field with a relatively strong magnetic field intensity.

[0129] Optionally, the at least three first magnetic members 311 of the first magnetic circuit part 31 in the magnetic circuit system 3 can also form a Halbach magnetic member array. In this way, according to the magnetic field law of the Halbach array, the magnetic field where the part of the surface of the diaphragm 212 corresponding to the first magnetic member 311 is located is better than the magnetic field where the part not corresponding to the first magnetic member 311 is located, including aspects such as magnetic field intensity, linearity of magnetic field intensity change with position, and uniformity of magnetic induction line distribution.

[0130] It can be understood that the voice coil 22 is optionally disposed in the region defined by the orthographic projection of the first magnetic member 311 on the surface of the diaphragm 212. Optionally, the orthographic projection of the voice coil 22 on the surface of the diaphragm 212 is located within the orthographic projection of the first magnetic member 311 on the surface of the diaphragm 212, so that the voice coil 22 is in a relatively reasonable magnetic field, thereby alleviating the distortion of the audio output by the sound generating device 100 and improving the sound quality of the audio output by the sound generating device 100.

[0131] Since the directions of the magnetic induction lines in two adjacent first magnetic members 311 are opposite, the directions of the magnetic forces received by the voice coils 22 corresponding to the two adjacent first magnetic members 311 are the same, which is beneficial to driving the diaphragm 212 to vibrate and generate sound, thereby increasing the proportion of the reasonable magnetic field in the magnetic field at the diaphragm 212, that is, increasing the proportion of the portion of the surface of the diaphragm 212 corresponding to the first magnetic member 311, which is beneficial to improving the rationality of the magnetic field in which the diaphragm 212 is located, thereby alleviating the distortion of the audio output by the sound generating device 100 and improving the sound quality of the audio output by the sound generating device 100.

[0132] It can be understood that the distances from the surfaces of two adjacent first magnetic members 311 adjacent to the diaphragm 212 to the diaphragm 212 are the same, which is beneficial to further improving the rationality of the magnetic field in which the diaphragm 212 is located, further alleviating the distortion of the audio output by the sound generating device 100, and improving the sound quality of the audio output by the sound generating device 100.

[0133] In this embodiment, the magnetization directions of two adjacent first magnetic members 311 among at least three first magnetic members 311 of the first magnetic circuit portion 31 are opposite, that is, when the N pole of one first magnetic member 311 is on the top and the S pole is on the bottom among two adjacent first magnetic members 311, the N pole of the other first magnetic member 311 is on the bottom and the S pole is on the top, and vice versa. Of course, in other embodiments, two adjacent first magnetic members 311 are spaced apart, so that a horizontal magnetic field can be formed directly above the space.

[0134] In one embodiment, the first magnetic member 311 located in the middle position is magnetized downward in the vertical direction, and the first magnetic members 311 located at both ends are magnetized horizontally and in a direction away from the middle first magnetic member 311 respectively.

[0135] It can be understood that a first magnetic member 311 is arranged horizontally between two adjacent first magnetic members 311, that is, the N pole of the first magnetic member 311 located between two adjacent first magnetic members 311 is opposite and spaced from one first magnetic member 311, and the S pole is opposite and spaced from the other first magnetic member 311. This is not limited herein. Alternatively, the two first magnetic members 311 on both sides of the middle first magnetic member 311 are arranged horizontally. For example, when the N pole of the middle first magnetic member 311 is at the bottom and the S pole is at the top, the S poles of the two first magnetic members 311 on both sides of the middle first magnetic member 311 are located at one end close to the middle first magnetic member 311, and the N poles are located at one end far from the middle first magnetic member 311. Vice versa, this is not limited herein.

[0136] Of course, in other embodiments, the first magnetic member 311 at the middle position is magnetized upward in the vertical direction, and the first magnetic members 311 at both ends are magnetized horizontally and toward the direction close to the middle first magnetic member 311 respectively.

[0137] In one embodiment, there are three first magnetic members 311 and one second magnetic member. The magnetization direction of the second magnetic member is opposite to that of the first magnetic member 311 at the middle position. By making the magnetization direction of the second magnetic member opposite to that of the first magnetic member 311 at the middle position in the first magnetic path portion 31, the magnetic induction line distribution of the magnetic field where the diaphragm 212 is located is made more uniform, and the magnetic field intensity change in the vibration direction of the diaphragm 212 has better linearity, thereby optimizing the performance of the sound generating device 100 and increasing the BL of the sound generating device 100 by 37.64%.

[0138] In one embodiment, the number of the second magnetic members is the same as the number of the first magnetic members 311, and the magnetization directions of the corresponding upper and lower first magnetic members 311 and second magnetic members are opposite.

[0139] In this embodiment, the number of the first magnetic members 311 is three, five or more; correspondingly, the number of the second magnetic members is one, three, five or more, so that the magnetization directions of the corresponding upper and lower first magnetic members 311 and second magnetic members are opposite. It can be understood that by respectively arranging the second magnetic path portion 32 and the first magnetic path portion 31 on the opposite sides of the vibration system 2, and making the magnetization directions of the first magnetic members 311 in the first magnetic path portion 31 and the second magnetic members in the second magnetic path portion 32 corresponding up and down opposite, that is, making the magnetic fields generated by the magnetic member arrays on both surfaces of the diaphragm 212 symmetrical, so that the magnetic induction line distribution of the magnetic field where the diaphragm 212 is located is more uniform, and the magnetic field intensity change in the vibration direction of the diaphragm 212 has better linearity.

[0140] Optionally, the first magnetic circuit portion 31 and the second magnetic circuit portion 32 located on opposite sides of the vibration system 2 may respectively form Halbach magnetic element arrays. Of course, in other embodiments, the first magnetic circuit portion 31 and the second magnetic circuit portion 32 located on opposite sides of the vibration system 2 may also respectively form other magnetic element arrays, which are not limited herein.

[0141] In some embodiments of the present invention, by controlling the magnetization directions of the first magnetic circuit portion 31 and the second magnetic circuit portion 32, the second magnetic circuit portion 32 and the first magnetic circuit portion 31 respectively form Halbach magnetic element arrays on both side surfaces of the diaphragm 212, which can help alleviate the second harmonic distortion and third harmonic distortion of the diaphragm 212, further alleviate the distortion of the audio output by the sound generating device 100, and improve the sound quality of the audio output by the sound generating device 100. In this embodiment, by appropriately adjusting the size of the second magnetic circuit portion 32 so that the size of the second magnetic circuit portion 32 is between the sizes of the first magnetic circuit portion 31, the effective magnetic field is fully utilized to further increase the BL value of the sound generating device 100.

[0142] In this embodiment, by optimizing the different magnetization directions of the second magnetic circuit portion 32 and the first magnetic circuit portion 31 on opposite sides of the vibration system 2, the BL value of the sound generating device 100 is increased by 37.12%.

[0143] In this embodiment, the first magnetic circuit portion 31 includes three first magnetic elements 311. For example, the middle first magnetic element 311 and the adjacent first magnetic elements 311 on both sides of the middle first magnetic element 311. By adjusting the magnetization directions of the three first magnetic elements 311 in the first magnetic circuit portion 31, a Halbach magnetic element array is formed. It can be understood that by setting the magnetization directions of the three first magnetic elements 311 such that the first magnetic element 311 located in the middle position is magnetized vertically downward, and the first magnetic elements 311 located at both ends are magnetized horizontally and away from the middle first magnetic element 311 respectively, a magnetic field composed of alternating polarity loops is generated. The alternating polarity loops originate from the middle first magnetic element 311, bend along the paths above the first magnetic elements 311 polarized in the + and -X directions, and finally return to the first magnetic elements 311 on the outermost part of the array.

[0144] In one embodiment, there are five first magnetic elements 311. The first magnetic element 311 located in the middle position is magnetized vertically downward, the two first magnetic elements 311 located at both ends are magnetized vertically upward, and the two first magnetic elements 311 arranged on both sides of the first magnetic element 311 located in the middle position are magnetized horizontally and away from the first magnetic element 311 located in the middle position respectively.

[0145] It can be understood that the first magnetic circuit part 31 includes five first magnetic members 311 arranged horizontally. The first magnetic member 311 at the middle position is magnetized downward in the vertical direction, and the two first magnetic members 311 at both ends are magnetized upward in the vertical direction. The two first magnetic members 311 arranged on both sides of the first magnetic member 311 at the middle position are magnetized horizontally and in the direction away from the first magnetic member 311 at the middle position respectively.

[0146] The first magnetic circuit part 31 includes three, five or more first magnetic members 311. By adjusting the magnetization directions of the three, five or more first magnetic members 311 in the first magnetic circuit part 31, the first magnetic circuit part 31 of the Halbach array is formed. In this embodiment, by setting the magnetization directions of the five first magnetic members 311 such that the first magnetic member 311 at the middle position is magnetized downward in the vertical direction, the two first magnetic members 311 at both ends are magnetized upward in the vertical direction, and the two or more first magnetic members 311 arranged on both sides of the first magnetic member 311 at the middle position are magnetized horizontally and in the direction away from the first magnetic member 311 at the middle position respectively, a magnetic field composed of alternating polarity loops is generated. The alternating polarity loops originate from the middle first magnetic member 311, bend along the paths above the first magnetic members 311 polarized in the + and -X directions, and finally return to the first magnetic members 311 on the outermost part of the array.

[0147] In one embodiment, a connecting member is provided between two adjacent first magnetic members 311 to define an assembly gap between the two first magnetic members 311.

[0148] In this embodiment, by providing a connecting member between two adjacent first magnetic members 311, the first magnetic members 311 are fixed by the connecting member, so as to ensure that the relative position relationship between the first magnetic circuit part 31 and the diaphragm 212 is also fixed, thereby ensuring the vibration frequency of the diaphragm 212. At the same time, the assembly gap between the two first magnetic members 311 is defined by the connecting member provided between the two adjacent first magnetic members 311. On the one hand, the assembly gap is used to facilitate the assembly of the first magnetic circuit part 31, and on the other hand, the assembly gap can also be used to reduce the obstruction of the magnetic field to the airflow, so that the sound generating device 100 has good air compliance, further improving the sound quality of the audio output by the sound generating device 100, improving the high-frequency effect while alleviating the distortion of the audio output by the sound generating device 100.

[0149] It can be understood that two adjacent first magnetic members 311 can also be arranged at intervals, so as to form a channel for air flow between the two adjacent first magnetic members 311, allowing air flow to circulate in the magnetic field, thereby reducing the obstruction of the magnetic field to the air flow, enabling the sound generating device 100 to have good air compliance, further alleviating the distortion of the audio output by the sound generating device 100, and improving the sound quality and high-frequency effect of the audio output by the sound generating device 100.

[0150] Of course, in other embodiments, the relative positions of two adjacent first magnetic members 311 can also be fixed by means of gluing, mechanical pressing, and fixing to external structures such as brackets. In this way, it is ensured that the relative positional relationship between the first magnetic circuit part 31 and the second magnetic circuit part 32 on both surfaces of the diaphragm 212 and the diaphragm 212 is also fixed, which is not limited herein.

[0151] Optionally, the distances between any two adjacent first magnetic members 311 are the same. Of course, in other embodiments, the first magnetic member 311 can also be arranged in a ring-like magnetic structure, which is not limited herein. The first magnetic member 311 / second magnetic member of the first magnetic circuit part 31 and the second magnetic circuit part 32 can also be arranged as magnetic material sheets. For example, different regions of the powdered ferrite in the adhesive are exposed to different magnetic fields for magnetization. Optionally, the first magnetic member 311 / second magnetic member of the first magnetic circuit part 31 and the second magnetic circuit part 32 can be independent magnets, such as magnetic strips. The independent magnets can be magnetized in different directions and then arranged side by side to effectively form a flat magnetic array with a rotating magnetic field, which is not limited herein.

[0152] In one embodiment, two adjacent first magnetic members 311 are arranged in contact with each other. It can be understood that the two adjacent first magnetic members 311 can be fixed by means of gluing or mechanical pressing, etc., which is not limited herein.

[0153] The present invention also provides an electronic device, which includes a device housing and the above-mentioned sound generating device 100. The sound generating device 100 is arranged inside the device housing. The specific structure of the sound generating device 100 refers to the foregoing embodiments. Since this electronic device adopts all the technical solutions of the foregoing embodiments, it at least has all the beneficial effects brought by the technical solutions of the foregoing embodiments, which will not be elaborated herein one by one.

[0154] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A sound generating device, characterized in that, the sound generating device comprises: a housing provided with an installation cavity; a vibration system including a diaphragm assembly and a voice coil disposed in the installation cavity, the diaphragm assembly separating the installation cavity into a front sound cavity and a rear sound cavity, the diaphragm assembly including a diaphragm, a dome and an adhesive layer, the diaphragm includes a central portion, a surround portion surrounding the central portion and a fixing portion connected to the outside of the surround portion, the fixing portion is connected to the housing, the central portion is provided with the first through hole, the dome is connected to the central portion through the adhesive layer, the dome is provided with the second through hole, the vertical projections of the first through hole and the second through hole on the diaphragm assembly do not coincide, the adhesive layer is provided with a venting groove, and a venting channel spaced from the front sound cavity and the rear sound cavity is provided between the dome and the central portion; wherein, the venting channel is formed by enclosing the central portion, the venting groove and the dome; or, the venting channel is formed by enclosing the adhesive layer and the dome, and the adhesive layer is provided with a third through hole communicating with the venting channel corresponding to the first through hole; or, the venting channel is formed by enclosing the adhesive layer and the central portion, and the adhesive layer is provided with a third through hole communicating with the venting channel corresponding to the second through hole; the voice coil is connected to a side of the dome facing away from the central portion; and a magnetic circuit system including a first magnetic circuit portion disposed in the rear sound cavity, the first magnetic circuit portion being opposite to and spaced from the voice coil.

2. The sound generating device according to claim 1, characterized in that, the first through hole and the second through hole are located at two ends of the venting channel; or, the second through hole is located between two ends of the venting channel.

3. The sound generating device according to claim 1, characterized in that, there are multiple venting channels, one ends of the multiple venting channels are all communicated with the second through hole, and the other ends of the multiple venting channels extend in a direction away from the second through hole; there are multiple first through holes, and each first through hole correspondingly communicates with one end of a venting channel away from the second through hole.

4. The sound generating device according to claim 1, characterized in that, the venting channel extends linearly; or, the venting channel extends in an arc or a wavy line; or, the venting channel is formed by connecting and extending at least two of a straight line segment, an arc segment and a broken line segment.

5. The sound generating device according to claim 1, characterized in that, defining the width of the venting channel as d1, d1≤0.5mm; and / or, defining the depth of the venting channel as d2, d2≤0.1mm.

6. The sound generating device according to claim 1, characterized in that, a groove communicating with the second through hole is recessed on a side of the dome facing the central portion, the central portion, the venting groove and the groove enclose to form the venting channel, and at least part of the vertical projection of the first through hole on the dome coincides with the groove.

7. The sound generating device according to claim 1, characterized in that, On the side of the central part facing the dome, a groove communicating with the first through hole is recessed, and the dome, the air release groove, and the groove enclose to form the air release channel. At least a part of the projection of the second through hole on the central part coincides with the groove.

8. The sound generating device according to claim 1, wherein, the extension length of the air release channel is greater than or equal to 0.1 mm; and / or, the extension length of the air release channel is less than or equal to twice the circumference of the dome.

9. The sound generating device according to claim 1, wherein, the first through hole is a circular hole, an oval hole, a triangular hole, a square hole or an irregular hole; and / or, the second through hole is a circular hole, an oval hole, a triangular hole, a square hole or an irregular hole; and / or, the cross section of the air release channel is semi-circular, U-shaped, V-shaped, W-shaped or wedge-shaped.

10. The sound generating device according to any one of claims 1 to 9, wherein, the magnetic circuit system further includes a second magnetic circuit part, and the second magnetic circuit part is arranged in the front sound cavity.

11. The sound generating device according to claim 10, wherein, the housing includes: a first housing having a first mounting groove, and the first magnetic circuit part is arranged in the first mounting groove; and a second housing having a second mounting groove, and the second magnetic circuit part is arranged in the second mounting groove. The second housing is connected to the first housing so that the second mounting groove and the first mounting groove enclose to form the mounting cavity; wherein, the periphery of the diaphragm assembly is clamped between the first housing and the second housing, so that the diaphragm assembly and the first mounting groove enclose to form the rear sound cavity, and the diaphragm assembly and the second mounting groove enclose to form the front sound cavity.

12. The sound generating device according to any one of claims 1 to 9, wherein, the first magnetic circuit part includes at least three first magnetic members arranged in a horizontal direction; the first magnetic member located in the middle position is magnetized in the vertical direction, and the magnetization directions of two adjacent first magnetic members are opposite; and / or, a connecting member is arranged between two adjacent first magnetic members to define an assembly gap between the two first magnetic members; or, two adjacent first magnetic members are arranged in abutting contact.

13. An electronic device, wherein, it includes a device housing and the sound generating device according to any one of claims 1 to 12, and the sound generating device is arranged in the device housing.

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