Sound generating devices and electronic equipment

Abstract

The present invention discloses a sound-generating device and an electronic device, the sound-generating device comprises a housing, a vibration system and a magnetic circuit system, the housing is provided with a mounting cavity and an air leakage hole, the cavity wall of the mounting cavity is provided with an air guide groove connected to the air leakage hole, the vibration system comprises a diaphragm and a voice coil arranged in the mounting cavity, the voice coil is arranged on one side of the diaphragm to drive the diaphragm to vibrate, the diaphragm divides the mounting cavity into a front sound cavity and a rear sound cavity, the air guide groove and the air leakage hole are located in the rear sound cavity, the magnetic circuit system comprises a first magnetic circuit part arranged in the rear sound cavity, the first magnetic circuit part covers the air leakage hole, and cooperates with the air guide groove to form an air leakage channel, the air leakage channel connects the air leakage hole and the rear sound cavity. The present invention aims to provide a sound-generating device that effectively improves sound quality and enhances treble effect, so that the sound-generating device can 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 in particular to a sound-generating device and an electronic device using the sound-generating device. Background Art

[0002] Loudspeakers, also known as horns, are an electroacoustic transducer widely used in electronic devices such as speakers, headphones, and mobile phones. Current speakers can be divided into dynamic speakers, moving iron speakers, and planar diaphragm speakers based on their working principles. In related technologies, in order to pursue higher sound quality, electronic devices such as headphones often use multiple drive units, that is, tweeters and woofers are used together. However, the size of tweeters is getting smaller and smaller. The current product structure design is limited by the external dimensions, and it is impossible to normally open a sound leakage hole that meets the requirements of the tweeter. As a result, the back cavity of the tweeter cannot be vented, which will lead to a decrease in frequency response performance in a high temperature and high humidity environment, thereby affecting the sound quality of the electronic equipment and the user's use effect. Summary of the invention

[0003] The main purpose of the present invention is to provide a sound-generating device and an electronic device, aiming to provide a sound-generating device that effectively improves the sound quality and enhances the treble effect, so that the sound-generating device can maintain stable frequency response performance in a high temperature and high humidity environment.

[0004] To achieve the above object, the present invention provides a sound-generating device, comprising:

[0005] A housing, wherein the housing is provided with a mounting cavity and an air leakage hole, and a cavity wall of the mounting cavity is provided with an air guide groove communicating with the air leakage hole;

[0006] A vibration system, the vibration system comprising a diaphragm and a voice coil disposed in the installation cavity, the voice coil being disposed on one side of the diaphragm to drive the diaphragm to vibrate, the diaphragm dividing the installation cavity into a front sound cavity and a rear sound cavity, the air guide groove and the air leakage hole being located in the rear sound cavity; and

[0007] A magnetic circuit system, the magnetic circuit system includes a first magnetic circuit part arranged in the rear acoustic cavity, the first magnetic circuit part covers the air leakage hole, and cooperates with the air guide groove to form an air leakage channel, and the air leakage channel connects the air leakage hole and the rear acoustic cavity.

[0008] In one embodiment, the housing includes a first shell, the first shell includes a bottom and a side portion arranged at the periphery of the bottom, the bottom and the side portion enclose a first mounting groove, the diaphragm covers a notch of the first mounting groove, and the air leakage hole is arranged at the bottom;

[0009] The air guide groove comprises a first section and a second section which are connected to each other, the first section is recessed in the bottom and connected to the air leakage hole, and the second section is recessed in the side portion;

[0010] The first magnetic circuit portion is connected to the bottom and covers the air leakage hole. The first magnetic circuit portion cooperates with the first section and the second section to form the air leakage channel.

[0011] In one embodiment, the extension height of the second section along the side portion is greater than the horizontal projection height of the first magnetic circuit portion on the side portion.

[0012] In one embodiment, the difference between the extension height of the second section along the side and the horizontal projection height of the first magnetic circuit portion on the side is defined as d1, and the height from the end of the side away from the bottom to the side of the first magnetic circuit portion facing away from the bottom is defined as d2;

[0013] Among them, d1 / d2≤5 / 6.

[0014] In one embodiment, the width of the air guide groove in a direction perpendicular to the extension of the first segment is defined as d3, and the length of the first magnetic circuit portion in a direction perpendicular to the extension of the first segment is defined as d4;

[0015] Among them, d3 / d4≤0.05.

[0016] In one embodiment, the housing further comprises a second shell, the second shell is provided with a second mounting groove, and the second shell is connected to the first shell so that the second mounting groove and the first mounting groove enclose the mounting cavity;

[0017] The periphery of the diaphragm is sandwiched between the first shell and the second shell, so that the diaphragm and the first mounting groove are combined to form the rear sound cavity, and the diaphragm and the second mounting groove are combined to form the front sound cavity;

[0018] The magnetic circuit system also includes a second magnetic circuit portion, and the second magnetic circuit portion is arranged in the second mounting groove.

[0019] In one embodiment, the first housing includes an injection molded part and a metal part that are integrally injection molded, the metal part includes a bottom plate and a side plate connected to the bottom plate, the injection molded part is arranged at the periphery of the bottom plate and connected to the side plate, the injection molded part cooperates with the side plate to form the side portion, the bottom plate forms the bottom, the vent hole and the first section are arranged on the bottom plate, and the second section is arranged on the side plate;

[0020] And / or, the second shell includes a central portion and an edge portion arranged on the outer periphery of the central portion, the edge portion and the central portion enclose a second mounting groove, the edge portion is bent and extended relative to the central portion in a direction away from the second magnetic circuit portion to define a glue coating groove with the side portion, and the glue coating groove is filled with sealing glue.

[0021] In one embodiment, the width of the air guide groove ranges from 0.06 mm to 0.1 mm;

[0022] And / or, the depth of the air guide groove ranges from 0.03 mm to 0.05 mm;

[0023] And / or, the air guide groove is a V-shaped groove or a square groove structure.

[0024] In one embodiment, the housing further comprises a second shell;

[0025] The diaphragm includes a central portion, a folding portion arranged around the central portion, and a fixing portion arranged outside the folding portion, the fixing portion is sandwiched between the first shell and the second shell, the folding portion protrudes toward the rear sound cavity, and the extending direction of the fixing portion is opposite to the protruding direction of the folding portion;

[0026] And / or, the diaphragm is a single-layer metal material; or, the diaphragm is formed into a composite layer structure, and at least the surface of the diaphragm connected to the voice coil is made of metal material;

[0027] And / or, the vibration system further comprises a reinforcement member, wherein the reinforcement member is disposed between the central portion and the voice coil;

[0028] And / or, the voice coil has at least a first wire segment and a second wire segment that are arranged opposite to each other, and the currents in the first wire segment and the second wire segment are in opposite directions;

[0029] And / or, the second shell is provided with a sound outlet hole connected to the front sound cavity, and the outer shell also includes a sound mouth arranged at the sound outlet hole.

[0030] In one embodiment, the first magnetic circuit portion includes at least three first magnetic members arranged in a horizontal direction;

[0031] The first magnetic member located in the middle is magnetized in the vertical direction, and the magnetization directions of two adjacent first magnetic members are opposite;

[0032] 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 close to each other.

[0033] The present invention further provides an electronic device, comprising a device housing and the above-mentioned sound-generating device, wherein the sound-generating device is arranged in the device housing.

[0034] The sound-generating device of the technical solution of the present invention is convenient for installing and fixing the vibration system and the magnetic circuit system by arranging an installation cavity in the shell, and dividing the installation cavity into a front sound cavity and a rear sound cavity by utilizing the diaphragm of the vibration system, and wiring the voice coil along the surface of the diaphragm, and arranging the first magnetic circuit part of the magnetic circuit system in the rear sound cavity and opposite to the voice coil, so that the first magnetic circuit part is used to generate a strong magnetic field, so that the diaphragm and the voice coil are in a strong magnetic field strength, and the magnetic flux lines at the diaphragm are evenly distributed, and the change of the magnetic field strength 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 vent on the shell and arranging an air guide groove on the cavity wall of the installation cavity, the first magnetic circuit part arranged in the rear sound cavity cooperates with the air guide groove to form an air vent channel, and the air vent and the rear sound cavity are connected by the air vent channel, so that the rear sound cavity can be vented by the cooperation of the air vent channel and the air vent, and the rear sound cavity can be depressurized, thereby ensuring that the sound-generating device has stable frequency response performance in a high temperature and high humidity environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0036] Figure 1 It is a structural schematic diagram of a sound-generating device in one embodiment of the present invention;

[0037] Figure 2 It is a structural schematic diagram of a sound-generating device from another perspective in one embodiment of the present invention;

[0038] Figure 3 is an exploded schematic diagram of a sound-generating device in one embodiment of the present invention;

[0039] Figure 4 is a cross-sectional schematic diagram of a sound-generating device in one embodiment of the present invention;

[0040] Figure 5 is a cross-sectional schematic diagram of a sound-generating device in another direction according to an embodiment of the present invention;

[0041] Figure 6 It is a schematic structural diagram of a first shell in one embodiment of the present invention;

[0042] Figure 7The FR performance test diagram of the existing sound-generating device under normal environment and under high temperature and high humidity environment;

[0043] Figure 8 It is a test diagram of the FR performance of the sound-generating device of the present invention in a high temperature and high humidity environment and the existing sound-generating device in a normal environment.

[0044] Description of Figure Numbers:

[0045]

[0046] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0049] At the same time, the meaning of "and / or" or "and / or" appearing in the full text includes three options. Taking "A and / or B" as an example, it includes option A, or option B, or a option in which both A and B are satisfied.

[0050] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0051] In the related art, in order to pursue higher sound quality, electronic devices such as headphones often use multiple drive units, that is, tweeters and woofers are used together. However, the size of tweeters is getting smaller and smaller. The current product structure design is limited by the external dimensions, and it is impossible to normally open a sound leakage hole that meets the use requirements of tweeters. As a result, the rear cavity of the tweeter cannot be vented, resulting in an air pressure difference between the rear cavity and the front cavity. This will cause a decrease in frequency response performance in a high temperature and high humidity environment, thereby affecting the sound quality of the electronic equipment and the user's use effect. At the same time, existing tweeters usually adopt an integrated structure of steel sheet injection molding for the shell, without leakage positions, and are sealed with glue around the periphery, and generally have problems such as poor treble effect.

[0052] Based on the above ideas 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, and mobile phones, and is not limited here.

[0053] Please refer to Figures 1 to 6 As shown, in an embodiment of the present invention, the sound-generating device 100 includes a shell 1, a vibration system 2 and a magnetic circuit system 3, wherein the shell 1 is provided with an installation cavity 11 and an air leakage hole 121, the cavity wall of the installation cavity 11 is provided with an air guide groove 123 connected to the air leakage hole 121, the vibration system 2 includes a diaphragm 21 and a voice coil 22 arranged in the installation cavity 11, the voice coil 22 is arranged on one side of the diaphragm 21 to drive the diaphragm 21 to vibrate, the diaphragm 21 divides the installation cavity 11 into a front sound cavity 14 and a rear sound cavity 15, the air guide groove 123 and the air leakage hole 121 are located in the rear sound cavity 15, the magnetic circuit system 3 includes a first magnetic circuit portion 31 arranged in the rear sound cavity 15, the first magnetic circuit portion 31 covers the air leakage hole 121, and cooperates with the air guide groove 123 to form an air leakage channel 128, and the air leakage channel 128 connects the air leakage hole 121 and the rear sound cavity 15.

[0054] In this embodiment, the housing 1 is used to install, fix, support and protect the vibration system 2, the magnetic circuit system 3 and other components, that is, the housing 1 provides an installation base for the vibration system 2, the magnetic circuit system 3 and other components. It can be understood that the housing 1 can be a mounting shell, a shell or a box body with a mounting cavity 11, which is not limited here.

[0055] In this embodiment, the housing 1 can be set to a circular or square structure, etc., which is not limited here. The housing 1 includes a first shell 12 and a second shell 13 that matches the first shell 12, so that the first shell 12 and the second shell 13 enclose a mounting cavity 11. It can be understood that the second shell 13 can be set to a U-shaped structure, which may include a flat bottom wall and a side wall arranged on the bottom wall. The first shell 12 can also be set to a U-shaped structure, which may include a flat top wall and side walls of the top wall. In this way, the first shell 12 and the second shell 13 are cross-fastened together to define a mounting cavity 11 for installing components such as the vibration system 2 and the magnetic circuit system 3. Of course, in other embodiments, the second shell 13 can also be a flat structure, which is not limited here.

[0056] It can be understood that the vibration system 2 includes a diaphragm 21 and a voice coil 22. The voice coil 22 is arranged on the diaphragm 21. The diaphragm 21 can be a flat diaphragm structure, so that the voice coil 22 is arranged on the flat surface of the diaphragm 21. In this embodiment, the voice coil 22 can be a flexible circuit board attached to the diaphragm 21. The voice coil 22 can also be composed of multiple coils arranged on the same surface of the diaphragm 21, which is not limited here.

[0057] Optionally, the diaphragm 21 can be made of metal or non-metal materials, such as paper, PET (polyester film), PEEK (polyetheretherketone), PAR (polyarylate), PI (polyimide), PEN, woven glass fiber or aluminum, etc., which are not limited here. Further, the diaphragm 21 can be a metal planar diaphragm.

[0058] In this embodiment, the magnetic circuit system 3 includes a first magnetic circuit portion 31 arranged in the rear sound cavity 15, and the diaphragm 21 and the voice coil 22 of the vibration system 2 are in the magnetic field strength formed by the first magnetic circuit portion 31, so that the magnetic flux lines at the diaphragm 21 are evenly distributed and the change of the magnetic field strength has good linearity, which can effectively improve the sound quality of the audio output by the sound-emitting device 100 and enhance the treble effect.

[0059] In one embodiment, the voice coil 22 is wired along the surface of the diaphragm 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 21. The voice coil 22 has at least a first wire segment 221 and a second wire segment 222 that are arranged opposite to each other, and the current directions in the first wire segment 221 and the second wire segment 222 are opposite to each other. In this way, the diaphragm 21 and the voice coil 22 are located in the magnetic field formed by the first magnetic circuit portion 31, so that when current flows through the voice coil 22, a magnetic force acting on the voice coil 22 is generated, thereby driving the diaphragm 21 to vibrate back and forth in the direction of the magnetic force to produce sound. It can be understood that after current flows through the voice coil 22, the currents in the first wire segment 221 and the second wire segment 222 that are arranged opposite to each other in the voice coil 22 flow in opposite directions.

[0060] Optionally, the first magnetic circuit portion 31 of the magnetic circuit system 3 may be an electromagnet or a permanent magnet, but its magnetic properties remain unchanged.

[0061] In this embodiment, if Figures 3 to 6 As shown, an air leakage hole 121 is provided in the outer shell 1, and an air guide groove 123 connected to the air leakage hole 121 is provided in the cavity wall of the installation cavity 11. In this way, the first magnetic circuit part 31 is arranged in the rear sound cavity 15 to cover the air leakage hole 121 and abut against the bottom wall and the side wall of the installation cavity 11. In this way, the first magnetic circuit part 31 cooperates with the air guide groove 123 to form an air leakage channel 128, and the air leakage channel 128 connects the air leakage hole 121 and the rear sound cavity 15. It can be understood that after the diaphragm 21 of the vibration system 2 divides the installation cavity 11 into the front acoustic cavity 14 and the rear acoustic cavity 15, the air leakage hole 121 is connected to the rear acoustic cavity 15 through the air leakage channel 128, so that the air leakage channel 128 and the air leakage hole 121 cooperate to achieve air leakage in the rear acoustic cavity 15 to balance the air pressure difference between the front acoustic cavity 14 and the rear acoustic cavity 15. In this way, the sound-emitting device 100 can maintain stable frequency response performance in a high temperature and high humidity environment, thereby improving the sound quality of the electronic device and improving the user experience. Moreover, by setting the air guide groove 123 on the inner wall of the outer shell 1, the first magnetic circuit part 31 cooperates with the air guide groove 123 to form an air leakage channel 128, and the air leakage channel 128 is connected to the air leakage hole 121. This can solve the problem that it is difficult to directly open the air leakage hole when the overall size of the sound-emitting device 100 is small. The above technical solution can directly control the air guide area of ​​the air guide groove 123 to adjust the air leakage area of ​​the air leakage hole 121. It is easy to operate and effectively solves the problem that the tweeter cannot open the sound leakage hole.

[0062] The sound-generating device 100 of the present invention is provided with an installation cavity 11 in the housing 1, so that the installation cavity 11 is conveniently used to install and fix the vibration system 2 and the magnetic circuit system 3, and the installation cavity 11 is divided into a front sound cavity 14 and a rear sound cavity 15 by using the diaphragm 21 of the vibration system 2, and the voice coil 22 is wired along the surface of the diaphragm 21, and the first magnetic circuit part 31 of the magnetic circuit system 3 is arranged in the rear sound cavity 15 and opposite to the voice coil 22, and the second magnetic circuit part 32 is arranged in the front sound cavity 14, so that the first magnetic circuit part 31 is used to generate a strong magnetic field, so that the diaphragm 21 and the voice coil 22 are in a strong magnetic field strength, and the magnetic flux lines at the diaphragm 21 are The distribution is uniform and the change of magnetic field intensity has good linearity, which can effectively improve the sound quality of the audio output by the sound-emitting device 100 and enhance the treble effect; at the same time, by arranging an air leakage hole 121 on the shell 1 and arranging an air guide groove 123 on the cavity wall of the installation cavity 11, the first magnetic circuit part 31 arranged in the rear sound cavity 15 cooperates with the air guide groove 123 to form an air leakage channel 128, and the air leakage hole 121 and the rear sound cavity 15 are connected by the air leakage channel 128. In this way, the rear sound cavity 15 can be vented by utilizing the cooperation of the air leakage channel 128 and the air leakage hole 121, thereby ensuring that the frequency response performance of the sound-emitting device 100 is stable under high temperature and high humidity environment.

[0063] It can be understood that the sound-generating device 100 of the present invention realizes micro-leakage by providing the air guide groove 123 and the air leakage hole 121, which effectively improves the reliability of the product, reduces the occurrence of defects in the whole machine, and reduces negative market feedback. The sound-generating device 100 has strong feasibility and high mass production.

[0064] In one embodiment, if Figure 3 and Figure 4 As shown, the magnetic circuit system 3 also includes a second magnetic circuit portion 32, and the second magnetic circuit portion 32 is arranged in the front sound cavity 14. It can be understood that by arranging the first magnetic circuit portion 31 and the second magnetic circuit portion 32 on opposite sides of the diaphragm 21, the first magnetic circuit portion 31 and the second magnetic circuit portion 32 form a strong magnetic field on opposite sides of the diaphragm 21 and the voice coil 22, so that the diaphragm 21 and the voice coil 22 of the vibration system 2 are in a strong magnetic field strength, and the magnetic flux lines at the diaphragm 21 are evenly distributed, and the change of the magnetic field strength 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.

[0065] Optionally, the first magnetic circuit part 31 of the magnetic circuit system 3 may be an electromagnet or a permanent magnet, but its magnetism remains unchanged. The second magnetic circuit part 32 may be an electromagnet or a permanent magnet, but its magnetism remains unchanged.

[0066] In one embodiment, the housing 1 includes a first shell 12 and a second shell 13, wherein the first shell 12 is provided with a first mounting groove 122 and an air leakage hole 121 connected to the first mounting groove 122, the groove wall of the first mounting groove 122 is provided with an air guide groove 123, the first magnetic circuit portion 31 is provided in the first mounting groove 122 and abuts against the groove wall of the first mounting groove 122 to cover the air leakage hole 121 and part of the air guide groove 123, the second shell 13 is provided with a second mounting groove 131, the second magnetic circuit portion 32 is provided in the second mounting groove 131, and the second shell 13 is connected to the first shell 12 so that the second mounting groove 131 and the first mounting groove 122 enclose a mounting cavity 11.

[0067] In this embodiment, if Figures 1 to 6 As shown, by setting the housing 1 as a two-part structure of a first shell 12 and a second shell 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 shell 12 and the second shell 13 can be fixedly connected to form an integral structure by sealing and matching such as welding and bonding, which can improve the connection stability and sealing performance of the first shell 12 and the second shell 13. Of course, in other embodiments, the first shell 12 and the second shell 13 can also be connected to form an integral structure by detachable connection methods such as snap connection, plug-in connection, screw connection or pin connection, so as to facilitate the disassembly or replacement of components such as the vibration system 2 and the magnetic circuit system 3. When the first shell 12 and the second shell 13 are connected as one, the second mounting groove 131 and the first mounting groove 122 enclose to form the mounting cavity 11.

[0068] It can be understood that by providing the first mounting groove 122 in the first housing 12, the first mounting groove 122 is used to realize the limited installation of the first magnetic circuit part 31, and the second mounting groove 131 is provided in the second housing 13, so as to realize the limited installation of the second magnetic circuit part 32 by using the second mounting groove 131. In this embodiment, the vent hole 121 runs through the groove wall of the first mounting groove 122.

[0069] In this embodiment, the air leakage hole 121 is arranged through the groove wall of the first installation groove 122, and the groove wall of the first installation groove 122 is concavely provided with an air guide groove 123. When the first magnetic circuit part 31 is arranged in the first installation groove 122, the first magnetic circuit part 31 abuts against the bottom wall and the side wall of the first installation groove 122, so that the first magnetic circuit part 31 covers the air leakage hole 121, and the first magnetic circuit part 31 covers the notch of the air guide groove 123, and is enclosed with the air guide groove 123 to form an air leakage channel 128 connecting the air leakage hole 121 and the rear acoustic cavity 15. It can be understood that one end of the air leakage channel 128 is connected to the air leakage hole 121, and the other end of the air leakage channel 128 is connected to the rear acoustic cavity 15, so that the rear acoustic cavity 15 is deflated by the cooperation of the air leakage channel 128 and the air leakage hole 121.

[0070] In one embodiment, the first shell 12 includes a bottom 124 and a side portion 125 arranged on the periphery of the bottom 124, the bottom 124 and the side portion 125 enclose a first mounting groove 122, the diaphragm 21 covers the notch of the first mounting groove 122, and the air leakage hole 121 is arranged on the bottom 124; the air guide groove 123 includes a first section 1231 and a second section 1232 that are connected to each other, the first section 1231 is recessed in the bottom 124 and connected to the air leakage hole 121, and the second section 1232 is recessed in the side portion 125; the first magnetic circuit portion 31 is connected to the bottom 124 and covers the air leakage hole 121, and the first magnetic circuit portion 31 cooperates with the first section 1231 and the second section 1232 to form an air leakage channel 128.

[0071] In this embodiment, if Figures 1 to 6 As shown, by arranging the air leakage hole 121 at the bottom 124 of the first shell 12 , the processing of the first shell 12 is facilitated on the one hand, and the appearance of the sound-generating device 100 can be improved on the other hand. It can be understood that by setting the air guide groove 123 to a first section 1231 and a second section 1232 that are connected, the first section 1231 is recessed in the bottom 124 and connected to the air leakage hole 121, and the second section 1232 is recessed in the side 125. In this way, the first magnetic circuit portion 31 can be connected to the bottom 124 by bonding, welding, etc., and when the first magnetic circuit portion 31 abuts against the side 125, the first magnetic circuit portion 31 covers the air leakage hole 121 and the first section 1231 set on the bottom 124, and the first magnetic circuit portion 31 covers part of the second section 1232 set on the side 125, that is, the end of the second section 1232 away from the first section 1231 exposes a side surface of the first magnetic circuit portion 31 facing away from the bottom 124, so that the first magnetic circuit portion 31 cooperates with the first section 1231 and the second section 1232 to form an air leakage channel 128, thereby realizing the air leakage of the rear sound cavity 15.

[0072] Optionally, the side 125 of the first shell 12 is perpendicular to the bottom 124. The bottom 124 may be a square structure. In order to adjust the size of the sound leakage area, there may be multiple air leakage holes 121 and air guide grooves 123, and the multiple air leakage holes 121 are arranged at intervals and are respectively connected to the multiple air guide grooves 123. Of course, the air leakage hole 121 may also be a strip or annular hole structure, which is connected to the multiple air guide grooves 123, which is not limited here.

[0073] In this embodiment, the air leakage hole 121 may be a circular hole, an elliptical hole, a triangular hole, a square hole or a trapezoidal hole, which is not limited here. In order to ensure the frequency response performance of the sound generating device 100, the air leakage area of ​​the air leakage hole 121 is less than or equal to 0.02 mm.

[0074] In one embodiment, the second shell 13 is provided with a second mounting groove 131, and the second shell 13 is connected to the first shell 12 so that the second mounting groove 131 and the first mounting groove 122 enclose a mounting cavity 11; the periphery of the diaphragm 21 is clamped between the first shell 12 and the second shell 13, so that the diaphragm 21 and the first mounting groove 122 enclose a rear sound cavity 15, and the diaphragm 21 and the second mounting groove 131 enclose a front sound cavity 14; the magnetic circuit system 3 also includes a second magnetic circuit part 32, and the second magnetic circuit part 32 is arranged in the second mounting groove 131.

[0075] In this embodiment, if Figure 4 As shown, the periphery of the diaphragm 21 is clamped between the first shell 12 and the second shell 13, so that the diaphragm 21 and the first mounting groove 122 are enclosed to form a rear sound cavity 15, and the diaphragm 21 and the second mounting groove 131 are enclosed to form a front sound cavity 14. This can not only improve the installation stability of the diaphragm 21, but also utilize the space between the first mounting groove 122 and the second mounting groove 131 to provide sufficient vibration space for the diaphragm 21.

[0076] In one embodiment, if Figure 4 As shown, the extension height of the second section 1232 along the side 125 is greater than the horizontal projection height of the first magnetic circuit part 31 on the side 125. That is to say, along the height direction of the side 125, the extension length of the second section 1232 is greater than the height of the first magnetic circuit part 31. It can be understood that the arrangement is such that the end of the second section 1232 of the air guide groove 123 away from the first section 1231 exposes a side surface of the first magnetic circuit part 31 facing away from the bottom 124, so that the second section 1232 is connected to the rear sound cavity 15 located above the side surface of the first magnetic circuit part 31 facing away from the bottom 124, so as to ensure the smoothness of air leakage.

[0077] It can be understood that the air guide groove 123 can be a groove structure recessed in the side 125 and the bottom 124 of the first shell 12. Of course, in other embodiments, a channel cavity structure connecting the air leakage hole 121 and the rear sound cavity 15 can also be set inside the side 125 and the bottom 124 of the first shell 12, which is not limited here.

[0078] In one embodiment, if Figure 4 As shown, the difference between the extension height of the second section 1232 along the side 125 and the horizontal projection height of the first magnetic circuit portion 31 on the side 125 is defined as d1, and the height from the end of the side 125 away from the bottom 124 to the side of the first magnetic circuit portion 31 facing away from the bottom 124 is defined as d2; wherein d1 / d2≤5 / 6.

[0079] It can be understood that the arrangement is such that the ratio of the difference d1 between the height of the second section 1232 along the side 125 and the projection height of the first magnetic circuit portion 31 on the side 125 to the height d2 from the end of the side 125 away from the bottom 124 to the side of the first magnetic circuit portion 31 facing away from the bottom 124 is less than or equal to 5 / 6, so that when the first shell 12 and the second shell 13 are connected by glue sealing, the glue is prevented from flowing downward along the side 125 to block the air guide groove 123, thereby ensuring the unobstructed air leakage of the rear sound cavity 15.

[0080] In one embodiment, if Figure 5 As shown, the width of the air guide groove 123 in the extension direction perpendicular to the first section 1231 is defined as d3, and the length of the first magnetic circuit portion 31 in the extension direction perpendicular to the first section 1231 is defined as d4; wherein d3 / d4≤0.05.

[0081] It can be understood that the width d3 of the air guide groove 123 is related to the length d4 of the first magnetic circuit portion 31. The longer the length d4 of the first magnetic circuit portion 31 is, the greater the width d3 of the air guide groove 123 will be. In this embodiment, by limiting the ratio of the width d3 of the air guide groove 123 to the length d4 of the first magnetic circuit portion 31 to be less than or equal to 0.05, the air discharge of the rear acoustic cavity 15 can be ensured, while ensuring the stability of the frequency response performance.

[0082] In one embodiment, the width of the air guide groove 123 ranges from 0.06 mm to 0.1 mm, that is, the width d3 of the air guide groove 123 can be 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, etc., which is not limited here. In this way, the air leakage area of ​​the air leakage channel 128 can be guaranteed.

[0083] In one embodiment, the depth of the air guide groove 123 ranges from 0.03 mm to 0.05 mm. It is understandable that the depth of the air guide groove 123 is the depth of the air guide groove 123 in a direction perpendicular to the bottom 124. Optionally, the depth of the air guide groove 123 ranges from 0.03 mm, 0.04 mm, 0.05 mm, etc., which is not limited here, so that the air discharge area and air discharge smoothness of the air discharge channel 128 can be ensured. Optionally, the air guide groove 123 is a V-shaped groove or a square groove structure, which is not limited here.

[0084] In one embodiment, the first shell 12 includes an injection molded part 126 and a metal part 127 that are integrally injection molded. The metal part 127 includes a bottom plate 1271 and a side plate 1272 connected to the bottom plate 1271. The injection molded part 126 is arranged on the periphery of the bottom plate 1271 and is connected to the side plate 1272. The injection molded part 126 and the side plate 1272 cooperate to form the side portion 125, and the bottom plate 1271 forms the bottom 124. The air vent 121 and the first section 1231 are arranged on the bottom plate 1271, and the second section 1232 is arranged on the side plate 1272.

[0085] In this embodiment, if Figures 1 to 6 As shown, by configuring the first housing 12 as an injection molded part 126 and a metal part 127, the bottom plate 1271 of the metal part 127 is used as the main part of the bottom 124 of the first housing 12, and the first magnetic circuit part 31 is fixed to the bottom plate 1271 of the metal part 127, so that the metal part 127 is used to improve the heat dissipation effect of the sound-generating device 100, and effectively increase the volume of the rear sound cavity 15 of the sound-generating device 100. Optionally, the metal part 127 is a metal sheet, and the bottom plate 1271 and the side plate 1272 connected in one piece can be formed by bending or stamping, etc., which is not limited here.

[0086] It can be understood that the injection molded part 126 is a plastic part, and the injection molded part 126 and the metal part 127 can be integrally formed using an injection molding process, which can improve the structural strength of the first shell 12 and improve the sealing effect of the first shell 12.

[0087] In this embodiment, the vent hole 121 and the first section 1231 are provided on the bottom plate 1271 of the metal part 127 , and the second section 1232 is provided on the side plate 1272 of the metal part 127 , thereby facilitating stamping processing on the metal part 127 .

[0088] In one embodiment, the second shell 13 includes a central portion 133 and an edge portion 134 arranged on the outer periphery of the central portion 133, the edge portion 134 and the central portion 133 are combined to form a second installation groove 131, and the edge portion 134 is bent and extended relative to the central portion 133 in a direction away from the second magnetic circuit portion 32 to define a glue coating groove 135 with the side portion 125, and the glue coating groove 135 is filled with sealing glue.

[0089] In this embodiment, if Figure 2 and Figure 4 As shown, by setting the second shell 13 to be a center portion 133 and an edge portion 134, the edge portion 134 is connected to the periphery of the center portion 133, so that the center portion 133 and the edge portion 134 are used to enclose the second installation groove 131. It can be understood that the second magnetic circuit portion 32 is fixed to the center portion 133. By bending and extending the edge portion 134 relative to the center portion 133 in a direction away from the second magnetic circuit portion 32, when the second shell 13 is connected to the first shell 12 through the edge portion 134, the edge portion 134 of the second shell 13 and the side portion 125 of the second shell 13 define a glue groove 135. Optionally, the edge portion 134 is optionally an L-shaped structure.

[0090] It can be understood that by filling the glue coating groove 135 with sealing glue and solidifying the sealing glue to form a sealant, the connection stability and sealing performance between the first shell 12 and the second shell 13 can be effectively improved.

[0091] In one embodiment, the diaphragm 21 includes a central portion 211, a folded ring portion 212 arranged around the central portion 211, and a fixed portion 213 arranged on the outside of the folded ring portion 212. The fixed portion 213 is clamped between the first shell 12 and the second shell 13. The folded ring portion 212 protrudes toward the rear sound cavity 15, and the extension direction of the fixed portion 213 is opposite to the protruding direction of the folded ring portion 212.

[0092] In this embodiment, if Figure 3 and Figure 4 As shown, the fixing portion 213 of the diaphragm 21 is sandwiched between the edge portion 134 and the side portion 125. It can be understood that the voice coil 22 is wired along the surface of the central portion 211 and is opposite to the first magnetic circuit portion 31. The fixing portion 213 of the diaphragm 21 is sandwiched between the edge portion 134 and the side portion 125, which can not only improve the installation stability of the diaphragm 21, but also increase the effective vibration area of ​​the diaphragm 21, thereby improving the sound effect of the sound-generating device 100.

[0093] Optionally, the folding ring portion 212 protrudes toward the rear acoustic cavity 15, and the extending direction of the fixing portion 213 is opposite to the protruding direction of the folding ring portion 212. This can prevent the edge portion 134 of the second housing 13 from interfering with the vibration of the folding ring portion 212.

[0094] In one embodiment, the diaphragm 21 is a single-layer metal material. It is understandable that the diaphragm 21 can be selected as a flat single-layer metal material to improve the sensitivity of the diaphragm 21. Optionally, the diaphragm 21 is an aluminum plate, etc., which is not limited here.

[0095] Of course, in other embodiments, the diaphragm 21 may also be made of a single-layer film material such as PET (polyester film), PEEK (polyetheretherketone), PAR (polyarylate) or PI (polyimide), which is not limited here.

[0096] The diaphragm 21 made of a single-layer membrane material is either too hard and brittle, and the surface of the diaphragm 21 is uneven when the tension is small, and the diaphragm 21 is too tight and easy to break when the tension is large; or it is too soft, and the surface tension of the diaphragm 21 is insufficient, and because the diaphragm 21 is too easy to stretch, the tension becomes smaller and smaller with time or after vibration, and finally the diaphragm 21 is too loose. In addition, the internal damping of the single-layer membrane material is insufficient, and the trailing edge characteristics of the transient characteristics of the diaphragm 21 are not good, that is, when the vibration coil stops being energized, the diaphragm 21 needs to delay for a longer time to stop vibrating due to the small internal damping. In one embodiment, the diaphragm 21 is formed into a composite layer structure, and at least the surface of the diaphragm 21 connected to the voice coil 22 is a metal material.

[0097] It can be understood that by setting the diaphragm 21 as a composite layer structure, the diaphragm 21 can play a good supporting role and provide sufficient rigidity. In this embodiment, by setting the surface connecting the diaphragm 21 and the voice coil 22 as a metal material, the metal material can be used to play a good supporting role and provide sufficient rigidity, and the other composite structures of the diaphragm 21 can be used to provide good elasticity and sufficient damping, so that the diaphragm 21 has a low distortion effect within a relatively large vibration range.

[0098] In this embodiment, the diaphragm 21 may be a double-layer or multi-layer composite structure, which is not limited here. This embodiment takes a double-layer composite structure as an example, and the diaphragm 21 includes a first sub-diaphragm and a second sub-diaphragm. The first sub-diaphragm can play a good supporting role and provide sufficient rigidity, while the second sub-diaphragm can provide good elasticity and sufficient damping, so that the diaphragm 21 has a low distortion effect within a relatively large vibration range.

[0099] It is understandable that the material of the first sub-diaphragm can be a metal material, such as an aluminum plate, etc., and the material of the second sub-diaphragm can be PEEK (polyetheretherketone), PAR (polyarylate), TPU (ThermoplasticPolyurethanes, thermoplastic polyurethane elastomer rubber) or TPE (Thermoplastic Elastomer, thermoplastic elastomer), etc. The first sub-diaphragm and the second sub-diaphragm can be bonded by an adhesive layer such as acrylic or silicone or other soft polymer materials, which is not limited here.

[0100] In one embodiment, if Figure 4 As shown, the vibration system 2 further includes a reinforcement member 23, which is disposed between the central portion 211 and the voice coil 22. It can be understood that by providing the reinforcement member 23, the central portion 211 of the diaphragm 21 can be reinforced by the reinforcement member 23 to improve the vibration effect. The hardness of the reinforcement member 23 is greater than the hardness of the diaphragm 21, so as to strengthen the overall rigidity of the surface of the diaphragm 21, so that the surface of the diaphragm 21 has a consistent vibration amplitude as much as possible, and the diaphragm 21 exhibits overall piston vibration.

[0101] Optionally, the shape of the reinforcement member 23 may be circular, and of course, the shape of the reinforcement member 23 may also be strip-shaped, comb-shaped, etc. In one embodiment, a plurality of reinforcement members 23 are arranged on the diaphragm 21, and the extension direction of the reinforcement members 23 intersects with the voice coil 22, and may be vertical, so as to form a cross grid shape. The voice coil 22 can also play a role in strengthening the overall rigidity of the surface of the diaphragm 21 to a certain extent. The voice coil 22 and the reinforcement members 23 together strengthen the overall rigidity of the surface of the diaphragm 21.

[0102] In one embodiment, if Figure 3As 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 221 and the second wire segment 222 of the voice coil 22 are respectively two opposite first straight sides or two second straight sides. Such a configuration effectively increases the magnetic flux of the voice coil 22 compared to the traditional racetrack voice coil.

[0103] Optionally, there are two voice coils 22, and the two voice coils 22 are arranged on the upper and lower sides of the diaphragm 21. It can be understood that the voice coil 22 can be formed by printing, evaporation, or 3D printing on the surface of the diaphragm 21. The diaphragm 21 can have a voice coil 22 on only one surface, or on both sides of the diaphragm 21, which is not limited here.

[0104] By passing current through the voice coil 22, the diaphragm 21 is driven to vibrate in a predetermined direction to produce sound, wherein the direction of the magnetic force on the voice coil 22 is continuously changed by continuously changing the direction of the current flowing in the voice coil 22, thereby controlling the reciprocating vibration of the diaphragm 21. It can be understood that the more voice coils 22 there are, the greater the magnetic force driving the diaphragm 21 to vibrate, and the higher the sensitivity of controlling the vibration of the diaphragm 21. However, the size of the surface of the diaphragm 21 and the product specifications of the sound-generating device 100 also need to be considered, which are not limited here.

[0105] In the present embodiment, the wire material of the voice coil 22 may be a metal such as aluminum, copper, nickel, gold, silver, or an alloy of these metals, which is not limited here.

[0106] Since only the portion of the surface of the diaphragm 21 where the voice coil 22 is provided will be affected by the magnetic force, while the portion where the voice coil 22 is not provided will not be affected by the magnetic force, the portion of the surface of the diaphragm 21 where the voice coil 22 is provided and the portion where the voice coil 22 is not provided will present different split vibrations, that is, the vibration amplitude of the portion of the surface of the diaphragm 21 where the voice coil 22 is provided is greater than the vibration amplitude of the portion where the voice coil 22 is not provided. As a result, the frequency response curve of the sound-generating device 100 will have peaks and valleys, causing the audio output by the sound-generating device 100 to be distorted, and ultimately causing the acoustic performance of the sound-generating device 100 to deteriorate.

[0107] In view of this, the vibration system 2 further includes a reinforcement member 23 , which is disposed on the surface of the diaphragm 21 .

[0108] In one embodiment, if Figures 1 to 4 As shown, the second shell 13 is provided with a sound outlet 132 connected to the front sound cavity 14, and the housing 1 further includes a sound mouth 16 provided at the sound outlet 132. It can be understood that by providing the sound outlet 132 at the central portion 133 of the second shell 13, it is convenient for the sound emitted by the vibration of the diaphragm 21 to be transmitted to the outside of the housing 1 through the sound outlet 132. The sound mouth 16 can improve the transmission effect.

[0109] In one embodiment, the first magnetic circuit portion 31 includes at least three first magnetic members 311 arranged in a horizontal direction.

[0110] In this embodiment, if Figures 3 to 5 As 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 close to each other or connected by a connecting member, etc., which is not limited here. 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 the two adjacent first magnetic members 311 are opposite.

[0111] Of course, the second magnetic circuit portion 32 includes at least one second magnetic member, which may be an electromagnet or a permanent magnet, but its magnetism remains unchanged. Any adjacent second magnetic members may be arranged at intervals or close to each other or connected by a connector, etc., which is not limited here.

[0112] It can be understood that when one of the at least three first magnetic components 311 of the first magnetic circuit portion 31 in the magnetic circuit system 3 is magnetized in the vertical direction, the magnetization directions of two adjacent first magnetic components 311 are opposite, that is, the two first magnetic components 311 with opposite magnetization directions are arranged alternately, thereby forming a magnetic component array and generating a magnetic field with a stronger magnetic field strength.

[0113] Optionally, at least three first magnetic parts 311 of the first magnetic circuit part 31 in the magnetic circuit system 3 can also form a Halbach magnetic part array. In this way, according to the magnetic field law of the Halbach array, the magnetic field of the part corresponding to the first magnetic part 311 on the surface of the diaphragm 21 is better than the magnetic field of the part not corresponding to the first magnetic part 311, including the magnetic field strength, the linearity of the magnetic field strength with position, and the uniformity of the distribution of magnetic flux lines.

[0114] It can be understood that the voice coil 22 is optionally disposed in an area defined by the orthographic projection of the first magnetic member 311 on the surface of the diaphragm 21. Optionally, the orthographic projection of the voice coil 22 on the surface of the diaphragm 21 is located in the orthographic projection of the first magnetic member 311 on the surface of the diaphragm 21, so that the voice coil 22 is in a more reasonable magnetic field, so as to 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.

[0115] Since the directions of the magnetic flux lines in two adjacent first magnetic parts 311 are opposite, the directions of the magnetic forces on the voice coils 22 corresponding to the two adjacent first magnetic parts 311 are the same, which is beneficial to driving the diaphragm 21 to vibrate and produce sound, thereby increasing the proportion of the reasonable magnetic field in the magnetic field at the diaphragm 21, that is, increasing the proportion of the part of the surface of the diaphragm 21 corresponding to the first magnetic parts 311, which is beneficial to improving the rationality of the magnetic field at the diaphragm 21, 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.

[0116] It can be understood that the distance between the surface of the two adjacent first magnetic parts 311 adjacent to the diaphragm 21 and the diaphragm 21 is the same, so as to further improve the rationality of the magnetic field in which the diaphragm 21 is located, further alleviate the distortion of the audio output by the sound-emitting device 100, and improve the sound quality of the audio output by the sound-emitting device 100.

[0117] In this embodiment, the magnetization directions of two adjacent first magnetic members 311 of at least three first magnetic members 311 of the first magnetic circuit portion 31 are opposite, that is, when the N pole of one of the two adjacent first magnetic members 311 is at the top and the S pole is at the bottom, the N pole of the other first magnetic member 311 is at the bottom and the S pole is at 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 spaced apart.

[0118] In one embodiment, the first magnetic member 311 in the middle is magnetized vertically downward, and the first magnetic members 311 at both ends are magnetized horizontally and in directions away from the middle first magnetic member 311 .

[0119] It is understandable that a horizontally placed first magnetic member 311 is provided between two adjacent first magnetic members 311, that is, the N pole of the first magnetic member 311 located between the two adjacent first magnetic members 311 is opposite to and spaced from one first magnetic member 311, and the S pole is opposite to and spaced from the other first magnetic member 311, which is not limited here. 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 pole is located at one end away from the middle first magnetic member 311, and vice versa, which is not limited here.

[0120] Of course, in other embodiments, the first magnetic member 311 in the middle is magnetized vertically upward, and the first magnetic members 311 at both ends are magnetized horizontally and toward the direction close to the middle first magnetic member 311 .

[0121] In one embodiment, there are three first magnetic members 311 and one second magnetic member, and the magnetization direction of the second magnetic member is opposite to that of the first magnetic member 311 located in the middle. By making the magnetization direction of the second magnetic member opposite to that of the first magnetic member 311 located in the middle of the first magnetic circuit portion 31, the magnetic flux lines of the magnetic field in which the diaphragm 21 is located are distributed more evenly, and the change of the magnetic field intensity in the vibration direction of the diaphragm 21 has better linearity, thereby optimizing the performance of the sound-generating device 100, and improving the BL of the sound-generating device 100 by 37.64%.

[0122] 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 first magnetic members 311 and the second magnetic members corresponding to each other are opposite.

[0123] 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 first magnetic members 311 and the second magnetic members corresponding to the upper and lower parts are opposite. It can be understood that by respectively arranging the second magnetic circuit part 32 and the first magnetic circuit part 31 on the opposite sides of the vibration system 2, and making the magnetization directions of the first magnetic members 311 in the upper and lower corresponding first magnetic circuit parts 31 and the second magnetic members in the second magnetic circuit parts 32 opposite, the magnetic fields generated by the magnetic member arrays on the surfaces of both sides of the diaphragm 21 are symmetrical, so that the magnetic flux lines of the magnetic field in which the diaphragm 21 is located are more evenly distributed, and the change of the magnetic field strength in the vibration direction of the diaphragm 21 has better linearity.

[0124] 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 a Halbach magnetic component array. 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 component arrays, which are not limited here.

[0125] In some embodiments of the present invention, by controlling the magnetization direction of the first magnetic circuit portion 31 and the second magnetic circuit portion 32 so that the second magnetic circuit portion 32 and the first magnetic circuit portion 31 respectively form a Halbach magnetic element array on the two side surfaces of the diaphragm 21, it is helpful to alleviate the second harmonic distortion and third harmonic distortion of the diaphragm 21, 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 size of the first magnetic circuit portion 31, the effective magnetic field is fully utilized, and the BL value of the sound-generating device 100 is further increased.

[0126] In this embodiment, the different magnetizing directions of the second magnetic circuit portion 32 and the first magnetic circuit portion 31 on opposite sides of the vibration system 2 are changed to optimize the BL value of the sound generating device 100 to be increased by 37.12%.

[0127] In this embodiment, the first magnetic circuit portion 31 includes three first magnetic members 311, for example, a middle first magnetic member 311 and adjacent first magnetic members 311 on both sides of the middle first magnetic member 311, and a Halbach magnetic member array is formed by adjusting the magnetization directions of the three first magnetic members 311 in the first magnetic circuit portion 31. It can be understood that by setting the magnetization directions of the three first magnetic members 311 such that 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 in the horizontal direction and in the direction away from the middle first magnetic member 311, a magnetic field composed of an alternating polarity loop is generated, and the alternating polarity loop is generated from the middle first magnetic member 311, bends along the path above the first magnetic member 311 polarized in the + and -X directions, and finally returns to the first magnetic member 311 on the outermost part of the array.

[0128] In one embodiment, the first magnetic member 311 includes five first magnetic members 311, the first magnetic member 311 located in the middle position is magnetized vertically downward, the two first magnetic members 311 located at both ends are magnetized vertically upward, and the two first magnetic members 311 located on both sides of the first magnetic member 311 located in the middle position are magnetized horizontally and in a direction away from the first magnetic member 311 in the middle position.

[0129] It can be understood that the first magnetic circuit portion 31 includes five first magnetic parts 311 arranged in the horizontal direction, the first magnetic part 311 located in the middle position is magnetized downward in the vertical direction, the two first magnetic parts 311 located at both ends are magnetized upward in the vertical direction, and the two first magnetic parts 311 on both sides of the first magnetic part 311 located in the middle position are respectively magnetized in the horizontal direction and in the direction away from the first magnetic part 311 in the middle position.

[0130] The first magnetic circuit portion 31 includes three, five or more first magnetic members 311. The first magnetic circuit portion 31 of the Halbach array is formed by adjusting the magnetization directions of the three, five or more first magnetic members 311 in the first magnetic circuit portion 31. In this embodiment, the magnetization directions of the five first magnetic members 311 are set such that the first magnetic member 311 located in the middle is magnetized downward in the vertical direction, the two first magnetic members 311 located at the two ends are magnetized upward in the vertical direction, and the two or more first magnetic members 311 located on both sides of the first magnetic member 311 located in the middle are magnetized in the horizontal direction and in the direction away from the first magnetic member 311 in the middle, so as to generate a magnetic field composed of an alternating polarity loop, which is generated from the middle first magnetic member 311, bends along the path above the first magnetic member 311 polarized in the + and -X directions, and finally returns to the first magnetic member 311 on the outermost part of the array.

[0131] In one embodiment, a connecting member is disposed between two adjacent first magnetic members 311 to define an assembly gap between the two first magnetic members 311 .

[0132] In this embodiment, a connecting member is provided between two adjacent first magnetic members 311, so that the first magnetic member 311 is fixed by the connecting member, so as to ensure that the relative position relationship between the first magnetic circuit portion 31 and the diaphragm 21 is also fixed, thereby ensuring the vibration frequency of the diaphragm 21. At the same time, the connecting member provided between the two adjacent first magnetic members 41 is used to define the assembly gap between the two first magnetic members 311. On the one hand, the assembly gap is used to facilitate the assembly of the first magnetic circuit portion 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, so as to further improve the sound quality of the audio output by the sound-generating device 100, improve the treble effect, and alleviate the distortion of the audio output by the sound-generating device 100.

[0133] It can be understood that two adjacent first magnetic parts 311 can also be arranged to be spaced apart, so as to form a channel for air flow between the two adjacent first magnetic parts 311, so as to allow the air flow to flow in the magnetic field, thereby reducing the obstruction of the magnetic field to the air flow, so that the sound-emitting device 100 has good air compliance, so as to further alleviate the distortion of the audio output by the sound-emitting device 100, and improve the sound quality and treble effect of the audio output by the sound-emitting device 100.

[0134] Of course, in other embodiments, the relative positions of two adjacent first magnetic parts 311 can also be fixed to each other by gluing, mechanical pressing, and fixing to an external structure such as a bracket, thereby ensuring that the relative position relationship between the first magnetic circuit part 31 and the second magnetic circuit part 32 on the two side surfaces of the diaphragm 21 and the diaphragm 21 is also fixed, which is not limited here.

[0135] Optionally, the spacing between any two adjacent first magnetic members 311 is consistent. Of course, in other embodiments, the first magnetic member 311 may also be set as a ring-like magnetic structure, which is not limited here. The first magnetic member 311 / second magnetic member of the first magnetic circuit portion 31 and the second magnetic circuit portion 32 may also be set as a sheet of magnetic material, such as different areas of powdered ferrite in an adhesive are exposed to different magnetic fields for magnetization. Optionally, the first magnetic member 311 / second magnetic member of the first magnetic circuit portion 31 and the second magnetic circuit portion 32 may be an independent magnet, such as a magnetic strip, and the independent magnet may 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 here.

[0136] In one embodiment, two adjacent first magnetic members 311 are disposed close to each other. It is understandable that the two adjacent first magnetic members 311 can be fixed by gluing or mechanical pressing, etc., which is not limited here.

[0137] like Figure 7 and Figure 8 As shown, Figure 7 The following is a reliability performance test chart of an existing tweeter (i.e., the rear cavity cannot be vented) under normal conditions and under high temperature and high humidity conditions. Figure 8 The reliability performance test diagram of the existing tweeter (i.e., the rear cavity cannot be vented) in a normal environment and the sound device 100 of the present application in a high temperature and high humidity environment. Figure 7 It can be seen that the existing tweeter has poor reliability in high temperature and high humidity environments because the rear cavity cannot be vented, which will lead to a decrease in frequency response performance (FR), thereby affecting the sound quality of electronic equipment and the user's experience. Figure 8 It can be seen that the sound-emitting device 100 of the present application is provided with an air leakage channel 128 and an air leakage hole 121, and utilizes the air leakage channel 128 and the air leakage hole 121 to achieve the air leakage of the rear sound cavity 15, so that when the reliability test is carried out in a high temperature and high humidity environment, its frequency response performance (FR) is equivalent to the frequency response performance (FR) of the existing tweeter in a normal environment, thereby ensuring that the frequency response performance of the sound-emitting device 100 is stable in a high temperature and high humidity environment.

[0138] The present invention further provides an electronic device, which includes a device housing and the above-mentioned sound-generating device 100, wherein the sound-generating device 100 is disposed in the device housing. The specific structure of the sound-generating device 100 refers to the above-mentioned embodiment. Since the electronic device adopts all the technical solutions of all 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 described one by one here.

[0139] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are 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, wherein the housing is provided with a mounting cavity and an air leakage hole, and a cavity wall of the mounting cavity is provided with an air guide groove communicating with the air leakage hole; A vibration system, the vibration system comprising a diaphragm and a voice coil disposed in the installation cavity, the voice coil being disposed on one side of the diaphragm to drive the diaphragm to vibrate, the diaphragm dividing the installation cavity into a front sound cavity and a rear sound cavity, the air guide groove and the air leakage hole being located in the rear sound cavity; and A magnetic circuit system, the magnetic circuit system comprising a first magnetic circuit portion disposed in the rear acoustic cavity, the first magnetic circuit portion covering the air leakage hole and cooperating with the air guide groove to form an air leakage channel, the air leakage channel connecting the air leakage hole and the rear acoustic cavity; Wherein, the outer shell includes a first shell, the first shell includes a bottom and a side portion arranged at the periphery of the bottom, and the air leakage hole is arranged at the bottom; the air guide groove includes a first section and a second section that are connected to each other, the first section is recessed in the bottom and connected to the air leakage hole, and the second section is recessed in the side portion; the first magnetic circuit portion cooperates with the first section and the second section to form the air leakage channel, and the extension height of the second section along the side portion is greater than the horizontal projection height of the first magnetic circuit portion on the side portion.

2. The sound generating device according to claim 1, characterized in that: The bottom and the side are combined to form a first installation slot, the diaphragm covers the notch of the first installation slot, the first magnetic circuit portion is connected to the bottom and covers the air leakage hole.

3. The sound-generating device according to claim 2, characterized in that: The difference between the extension height of the second section along the side and the horizontal projection height of the first magnetic circuit portion on the side is defined as d1, and the height from the end of the side away from the bottom to the side of the first magnetic circuit portion facing away from the bottom is defined as d2; Among them, d1 / d2≤5 / 6.

4. The sound generating device according to claim 2, characterized in that: The width of the air guide groove in a direction perpendicular to the extension of the first section is defined as d3, and the length of the first magnetic circuit portion in a direction perpendicular to the extension of the first section is defined as d4; Among them, d3 / d4≤0.

05.

5. The sound generating device according to claim 2, characterized in that: The housing further comprises a second shell, the second shell is provided with a second mounting groove, and the second shell is connected to the first shell so that the second mounting groove and the first mounting groove enclose the mounting cavity; The periphery of the diaphragm is sandwiched between the first shell and the second shell, so that the diaphragm and the first mounting groove are combined to form the rear sound cavity, and the diaphragm and the second mounting groove are combined to form the front sound cavity; The magnetic circuit system also includes a second magnetic circuit portion, and the second magnetic circuit portion is arranged in the second mounting groove.

6. The sound generating device according to claim 5, characterized in that: The first housing includes an injection molded part and a metal part that are integrally injection molded, the metal part includes a bottom plate and a side plate connected to the bottom plate, the injection molded part is arranged at the periphery of the bottom plate and connected to the side plate, the injection molded part cooperates with the side plate to form the side portion, the bottom plate forms the bottom, the vent hole and the first section are arranged on the bottom plate, and the second section is arranged on the side plate; And / or, the second shell includes a central portion and an edge portion arranged on the outer periphery of the central portion, the edge portion and the central portion enclose a second mounting groove, the edge portion is bent and extended relative to the central portion in a direction away from the second magnetic circuit portion to define a glue coating groove with the side portion, and the glue coating groove is filled with sealing glue.

7. The sound generating device according to any one of claims 1 to 6, characterized in that: The width of the air guide groove ranges from 0.06 mm to 0.1 mm; And / or, the depth of the air guide groove ranges from 0.03 mm to 0.05 mm; And / or, the air guide groove is a V-shaped groove or a square groove structure.

8. The sound generating device according to any one of claims 2 to 6, characterized in that: The housing also includes a second shell; The diaphragm includes a central portion, a folding portion arranged around the central portion, and a fixing portion arranged outside the folding portion, the fixing portion is sandwiched between the first shell and the second shell, the folding portion protrudes toward the rear sound cavity, and the extending direction of the fixing portion is opposite to the protruding direction of the folding portion; And / or, the diaphragm is a single-layer metal material; or, the diaphragm is formed into a composite layer structure, and at least the surface of the diaphragm connected to the voice coil is made of metal material; And / or, the vibration system further comprises a reinforcement member, wherein the reinforcement member is disposed between the central portion and the voice coil; And / or, the voice coil has at least a first wire segment and a second wire segment that are arranged opposite to each other, and the currents in the first wire segment and the second wire segment are in opposite directions; And / or, the second shell is provided with a sound outlet hole connected to the front sound cavity, and the outer shell also includes a sound mouth arranged at the sound outlet hole.

9. The sound generating device according to any one of claims 1 to 6, characterized in that: The first magnetic circuit portion includes at least three first magnetic members arranged in a horizontal direction; The first magnetic member located in the middle is magnetized in the vertical direction, and the magnetization directions of two adjacent first magnetic members are opposite; 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 close to each other.

10. An electronic device, characterized in that: The device comprises a device housing and a sound-generating device as claimed in any one of claims 1 to 9, wherein the sound-generating device is arranged in the device housing.

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