Sound production monomer and electronic equipment

Abstract

The invention discloses a sound production single body and electronic equipment, and relates to the technical field of electroacoustic transformation.The sound production single body comprises a shell, a magnetic circuit system and a vibration system, the magnetic circuit system is connected with the shell and comprises a center magnet and a side magnet assembly, and the side magnet assembly comprises two side magnets; the side magnet located on the inner side is arranged outside the center magnet in a surrounding mode, a magnetic gap is defined between the side magnet and the center magnet, and another magnetic gap is defined between the two side magnets. The side magnet assembly forms two avoiding gaps, the two avoiding gaps are arranged corresponding to two opposite corners of the center magnet respectively, and the side magnet assembly shields the other corners of the center magnet; the vibration system comprises an inner voice coil, an outer voice coil and two centering disks. According to the invention, the installation space of the airflow channel and the centering disk is provided through the avoiding gap, so that the volume of the sounding monomer is reduced, the air permeability requirement of the sounding monomer is met, the BL value of the sounding monomer is improved, and the sounding sensitivity of the sounding monomer is improved.

Description

Technical Field

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

[0002] Due to the miniaturization and thinness of electronic devices such as mobile phones and tablets, the installation space reserved for the sound unit is getting smaller and smaller, but at the same time, the sensitivity requirements for the sound unit are also increasing. Therefore, how to improve the sensitivity of the sound unit under the condition of limited product structure and size has become the key. Dual voice coil sound unit refers to a sound unit with two layers of inner and outer voice coils. Both layers of voice coils are connected to the diaphragm and vibrate together in the magnetic gap. It is usually used in scenes with high power and bass requirements.

[0003] The dual voice coil sound unit in the prior art usually forms a magnetic gap through an annular side magnet or a segmented side magnet. Although the annular side magnet greatly improves the sensitivity, it has insufficient air permeability and poor airflow, which affects the acoustic performance. It also causes structures such as centering supports to be set on the top of the side magnet, resulting in the occupation of the longitudinal space. In addition, the dual voice coil itself will increase the lateral space, resulting in the dual voice coil sound unit being too large. The segmented side magnet has no magnet and washer design at the corner corresponding to the center magnet, resulting in a low B value at the corner, which results in a small BL value of the overall sound unit and low sensitivity of the sound unit. Summary of the invention

[0004] The main purpose of the present invention is to provide a sound unit and an electronic device, aiming to solve the problems in the prior art that the double voice coil sound unit is too large in size and insufficient in air permeability when using annular side magnets, and has low sensitivity when using segmented side magnets.

[0005] To achieve the above object, the sound-emitting unit proposed by the present invention comprises:

[0006] shell;

[0007] A magnetic circuit system, the magnetic circuit system is connected to the housing, the magnetic circuit system includes a central magnet and a side magnet assembly, the side magnet assembly includes two side magnets arranged outside the central magnet in sequence from the inside to the outside, the side magnet located on the inside is arranged outside the central magnet and forms a magnetic gap between the central magnet, and another magnetic gap is formed between the two side magnets;

[0008] The side magnet assembly forms two avoidance gaps, the two avoidance gaps are connected to the two magnetic gaps, the two avoidance gaps are respectively arranged corresponding to the two opposite corners of the central magnet, and the side magnet assembly blocks the remaining corners of the central magnet;

[0009] A vibration system, the vibration system comprising an inner voice coil, an outer voice coil and two centering supports, the inner voice coil and the outer voice coil are nested and one end of each of the centering supports is respectively arranged corresponding to the corresponding magnetic gap, one end of each of the centering supports is connected to the outer shell, and the other end passes through the avoidance gap from the outside to the inside, extends into the other magnetic gap and is connected to the inner voice coil, and the inner voice coil is electrically connected to the outer voice coil.

[0010] In one embodiment, the two side magnets are respectively a first side magnet and a second side magnet, the first side magnet is arranged outside the center magnet and the magnetic gap formed between the first side magnet and the center magnet is a first magnetic gap, and the second side magnet is arranged outside the first side magnet and the magnetic gap formed between the first side magnet and the center magnet is a second magnetic gap;

[0011] The two avoidance gaps are respectively a first avoidance gap and a second avoidance gap, the inner voice coil is located in the first magnetic gap, the outer voice coil is located in the second magnetic gap, and the centering support plate passes through the second avoidance gap, the second magnetic gap, and the first avoidance gap from the outer shell in sequence and extends into the first magnetic gap to connect with the inner voice coil.

[0012] In one embodiment, the center magnet includes two first sides arranged opposite to each other along a first direction and two second sides arranged opposite to each other along a second direction, the two ends of each first side are respectively connected to the two second sides to form two corners, the two corners are respectively the first corner and the second corner, the number of the first side magnets and the number of the second side magnets are both two, the two first side magnets correspond to the second corners to form the first avoidance gap, and the two second side magnets correspond to the second corners to form the second avoidance gap.

[0013] In one embodiment, the first side magnet includes a first section and a second section, the second side magnet includes a third section and a fourth section, the first section and the third end extend along the first side, the second section and the fourth section extend along the second side, one end of the first section and the second section of another first side magnet corresponding to the second corner form the first avoidance gap; one end of the third section and the fourth section of another second side magnet corresponding to the second corner form the second avoidance gap.

[0014] In one embodiment, the first section, the second section, the third section and the fourth section are all arranged parallel to the center magnet so that the first side magnet and the center magnet form the first magnetic gap with uniform intervals, and the second side magnet and the first side magnet form the second magnetic gap with uniform intervals.

[0015] In one embodiment, the first section and the second section are smoothly connected at a side away from the central magnet to form an R angle; or, the first section and the second section are connected at a side away from the central magnet through a chamfered surface to form a C angle;

[0016] The third section and the fourth section are smoothly connected at a side away from the central magnet to form an R angle; or, the third section and the fourth section are connected at a side away from the central magnet through a chamfered surface to form a C angle.

[0017] In one embodiment, the central magnet includes two first sides arranged opposite to each other along a first direction and two second sides arranged opposite to each other along a second direction, and both ends of each first side are respectively connected to the two second sides to form two corners; the two corners are respectively the first corner and the second corner; the number of the first side magnets is four, and the number of the second side magnets is two, the two second side magnets form the second avoidance gap corresponding to the second corner, the four first side magnets form the first avoidance gap corresponding to the second corner, and an opening is formed corresponding to the first corner.

[0018] In one embodiment, the central magnet includes two first sides arranged opposite to each other along a first direction and two second sides arranged opposite to each other along a second direction, and the two ends of each first side are respectively connected to the two second sides to form two corners; the two corners are respectively the first corner and the second corner; the number of the first side magnets is two, the number of the second side magnets is four, the two first side magnets correspond to the second corners to form the first avoidance gap, the four second side magnets correspond to the second corners to form the second avoidance gap, and the corresponding first corners to form an opening

[0019] In one embodiment, the central magnet is a rectangular magnet, the long side of the rectangular magnet forms the first side, the short side of the rectangular magnet forms the second side, and the first side magnet and / or the second side magnet are L-shaped magnets.

[0020] In one embodiment, two corners on the same side of the outer shell corresponding to the central magnet are provided with embedding grooves, and a first welding pad and a second welding pad which are conductive to each other are respectively arranged in the two embedding grooves, the first welding pad is conductive to one of the centering support plates, and the second welding pad is arranged on the same side as the other centering support plate and both are conductive to the external circuit.

[0021] In one embodiment, the housing is a non-conductive housing, the first pad and the second pad are both conductive pads, and the first pad and the second pad are electrically connected via a conductive connecting rod.

[0022] In one embodiment, the shell is an injection molded shell, the first pad and the second pad are both metal pads, the conductive connecting rod is a metal connecting rod, and the first pad, the second pad, the conductive connecting rod and the shell are integrally injection molded.

[0023] In one embodiment, the housing is made of a conductive material, the first pad and the second pad are both conductive pads, and the first pad and the second pad are conductively connected via an external conductive member.

[0024] The present invention further provides an electronic device, comprising a protective shell and the above-mentioned sound-emitting unit, wherein the sound-emitting unit is installed in the protective shell.

[0025] The technical solution of the present invention forms two avoidance gaps on the side magnet assembly, and the avoidance gaps are set corresponding to the two corners of the center magnet, so that the avoidance gap has the least effect on the magnetic circuit system and reduces the effect on the BL value. The side magnet assembly then shields the remaining corners of the center magnet, so that the corners can also have magnets, increasing the B value here, thereby increasing the overall BL value of the sound unit and improving the sound sensitivity of the sound unit. At the same time, the avoidance gap is connected with the two magnetic gaps. The present invention allows the centering support plate to extend through the avoidance gap and one of the magnetic gaps through the design of the avoidance gap, and extend into the adjacent magnetic gap to connect with the inner voice coil, and the inner voice coil is electrically connected to the outer voice coil, without occupying the longitudinal space. Under the premise that the lateral space is increased after the sound unit adopts a double voice coil, the overall volume of the sound unit is reduced, and the avoidance gap provides an air flow channel, which improves the smoothness of the air flow of the sound unit, thereby improving the acoustic performance of the sound unit. The present invention provides an airflow channel and an installation space for a centering support piece by avoiding a gap, and the side magnet assembly blocks the corner to increase the BL value, thereby reducing the volume of the sound unit and meeting the air permeability requirement of the sound unit while also improving the BL value of the sound unit and improving the sound sensitivity of the sound unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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.

[0027] Figure 1 A schematic diagram of the explosion structure of the sound-generating unit provided by the present invention;

[0028] Figure 2 A schematic diagram of the structure of the magnetic circuit system, centering support plate and shell of the sound-generating unit provided by the present invention;

[0029] Figure 3 A schematic diagram of the structure of a magnetic circuit system of a sound-generating unit provided in a specific embodiment of the present invention;

[0030] Figure 4 A schematic diagram of the structure of a magnetic circuit system of a sound-generating unit provided in another specific embodiment of the present invention;

[0031] Figure 5 A schematic structural diagram of a magnetic circuit system of a sound-emitting unit provided in yet another specific embodiment of the present invention;

[0032] Figure 6 A schematic diagram of the structure of the housing of the sound-emitting unit provided by the present invention.

[0033] Description of Figure Numbers:

[0034] 100. Sounding unit; 1. Shell; 11. Embedded groove; 12. First solder pad; 13. Second solder pad; 14. Conductive connecting rod; 2. Magnetic circuit system; 21. Center magnet; 211. Corner; 212. First corner; 213. Second corner; 214. First side; 215. Second side; 22. Side magnet assembly; 221. First side magnet; 222. Second side magnet; 223. First section; 224. Second section; 225. Third section; 226. Fourth section; 227. Opening; 23. Magnetic gap; 23a. First magnetic gap; 23b. Second magnetic gap; 24. Avoidance gap; 24a. First avoidance gap; 24b. Second avoidance gap; 25. Washer; 3. Vibration system; 31. Inner voice coil; 32. Outer voice coil; 33. Centering support; 34. Diaphragm.

[0035] 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

[0036] 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.

[0037] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0038] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "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 technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0039] The present invention provides a sound-emitting unit 100. Figure 1 , Figure 2 and Figure 5 The sound-emitting unit 100 of the present embodiment includes a housing 1, a magnetic circuit system 2 and a vibration system 3. The magnetic circuit system 2 is connected to the housing 1. The magnetic circuit system 2 includes a central magnet 21 and a side magnet assembly 22. The side magnet assembly 22 includes two side magnets arranged outside the central magnet 21 in sequence from the inside to the outside. The side magnet located on the inner side is arranged outside the central magnet 21 and a magnetic gap 23 is formed between the central magnet 21. Another magnetic gap 23 is formed between the two side magnets; the side magnet assembly 22 forms two avoidance gaps 24, and the two avoidance gaps 24 are connected to the two magnetic gaps 23. The avoidance gaps 24 are respectively arranged corresponding to the two opposite corners 211 of the center magnet 21, and the side magnet assembly 22 blocks the other corners 211 of the center magnet 21; the vibration system 3 includes an inner voice coil 31, an outer voice coil 32 and two centering supports 33, the inner voice coil 31 and the outer voice coil 32 are nested and one end of each centering support 33 is respectively arranged corresponding to the corresponding magnetic gap 23, one end of each centering support 33 is connected to the outer shell 1, and the other end passes through the avoidance gap 24 and one magnetic gap 23 from the outside to the inside, extends into the other magnetic gap 23 and is connected to the inner voice coil 31, and the inner voice coil 31 is electrically connected to the outer voice coil 32.

[0040] The technical solution of the present invention forms two avoidance gaps 24 on the side magnet assembly 22, and the avoidance gaps 24 are set corresponding to the two corners 211 of the center magnet 21, so that the avoidance gaps 24 have the least effect on the magnetic circuit system 2, and reduce the effect on the BL value. Then, the side magnet assembly 22 shields the remaining corners 211 of the center magnet 21, so that the corners 211 can also have a magnet design, thereby increasing the B value here, thereby increasing the overall BL value of the sound unit 100 and improving the sound sensitivity of the sound unit 100; at the same time, the avoidance gaps 24 and the two The magnetic gap 23 is connected. The present invention uses the design of the avoidance gap 24 to allow the centering support 33 to extend through the avoidance gap 24 and one of the magnetic gaps 23, and extend into the adjacent magnetic gap 23 to connect with the inner voice coil 31, and the inner voice coil 31 is electrically connected to the outer voice coil 32, so that the longitudinal space will not be occupied, so that the overall volume of the sounding unit 100 is reduced under the premise that the lateral space is increased after the sounding unit 100 adopts a double voice coil, and the avoidance gap 24 provides an airflow channel, which improves the smoothness of the airflow of the sounding unit 100, thereby improving the acoustic performance of the sounding unit 100. The present invention provides an airflow channel and an installation space for the centering support 33 through the avoidance gap 24, and the side magnet assembly 22 blocks the corner 211 to increase the BL value, thereby reducing the volume of the sounding unit 100, meeting the air permeability requirements of the sounding unit, and improving the BL value of the sounding unit 100, thereby improving the sound sensitivity of the sounding unit 100.

[0041] Specifically, the two side magnets are respectively the first side magnet 221 and the second side magnet 222. The first side magnet 221 is arranged outside the center magnet 21 and the magnetic gap 23 formed between the first side magnet 221 and the center magnet 21 is the first magnetic gap 23a. The second side magnet 222 is arranged outside the first side magnet 221 and the magnetic gap 23 formed between the first side magnet 221 is the second magnetic gap 23b. The two avoidance gaps 24 are respectively the first avoidance gap 24a and the second avoidance gap 24b. The inner voice coil 31 is located in the first magnetic gap 23a, and the outer voice coil 32 is located in the second magnetic gap 23b. The centering support plate 33 passes through the second avoidance gap 24b, the second magnetic gap 23b, and the first avoidance gap 24a from the outer shell 1 in sequence and extends into the first magnetic gap 23a to connect with the inner voice coil 31.

[0042] The first magnetic gap 23a, the first avoidance gap 24a, the second magnetic gap 23b and the second avoidance gap 24b are sequentially connected from the inside to the outside, the inner voice coil 31 and the outer voice coil 32 are respectively located in the first magnetic gap 23a and the second magnetic gap 23b, and the first magnetic gap 23a and the second magnetic gap 23b are arranged in parallel to avoid interference between the inner voice coil 31 and the outer voice coil 32, and to ensure that the diaphragm is uniformly stressed during vibration. Specifically, the electrical connection between the inner voice coil 31 and the outer voice coil 32 can be through an FPC connection, or can be a method that can be realized in all existing technologies such as cotton thread, skeleton, etc.

[0043] In one embodiment, the vibration system 3 also includes a diaphragm 34, the inner voice coil 31 and the outer voice coil 32 are both connected to the diaphragm 34, and the magnetic circuit system 2 also includes a washer 25, which is arranged on the side of the center magnet 21 and the first side magnet 221 facing the diaphragm 34, and the shape of the washer 25 is adapted to the shape of the center magnet 21 and the first side magnet 221.

[0044] In one embodiment, the central magnet 21 includes two first edges 214 arranged opposite to each other along a first direction and two second edges 215 arranged opposite to each other along a second direction. The two ends of each first edge 214 are respectively connected to the two second edges 215 to form two corners 211. The two corners 211 are respectively a first corner 212 and a second corner 213. The number of the first side magnets 221 and the second side magnets 222 are both two. The two first side magnets 221 correspond to the second corners 213 to form a first avoidance gap 24a, and the two second side magnets 222 correspond to the second corners 213 to form a second avoidance gap 24b.

[0045] Each side magnet extends in the same direction as the first side 214 and the second side 215 to cover the periphery of the center magnet 21 except the two second corners 213, thereby increasing the magnetic flux density in this area and reducing magnetic leakage, thereby increasing the BL value of the sound unit 100, and further increasing the sensitivity of the sound unit 100. The number of the first side magnet 221 and the second side magnet 222 are both two and they are disconnected, which facilitates adjustment of the position and the size of the first avoidance gap 24a and the second avoidance gap 24b, thereby increasing layout flexibility.

[0046] In one embodiment, the first side magnet 221 includes a first section 223 and a second section 224, and the second side magnet 222 includes a third section 225 and a fourth section 226. The first section 223 and the third end extend along the first side 214, and the second section 224 and the fourth section 226 extend along the second side 215. One end of the first section 223 and the second section 224 of the other first side magnet 221 correspond to the second corner 213 to form a first avoidance gap 24a; one end of the third section 225 and the fourth section 226 of the other second side magnet 222 correspond to the second corner 213 to form a second avoidance gap 24b.

[0047] It can be seen that the second corner 213 is located between the other end of the first section 223 and the other second section 224, so that the two first avoidance gaps 24a are set diagonally, so that the magnetic field distribution in the first magnetic gap 23a is more uniform, avoiding the performance fluctuation of the inner voice coil 31 due to uneven magnetic field distribution, thereby improving the stability and acoustic performance of the sound unit 100; similarly, the second corner 213 is also located between the other end of the third section 225 and the other fourth section 226, so that the two second avoidance gaps 24b are set diagonally, so that the magnetic field distribution in the second magnetic gap 23b is more uniform, avoiding the performance fluctuation of the outer voice coil 32 due to uneven magnetic field distribution, thereby improving the stability and acoustic performance of the sound unit 100.

[0048] In one embodiment, the first section 223, the second section 224, the third section 225 and the fourth section 226 are all arranged parallel to the center magnet 21, so that the first side magnet 221 and the center magnet 21 form a uniformly spaced first magnetic gap 23a, and the second side magnet 222 and the first side magnet 221 form a uniformly spaced second magnetic gap 23b.

[0049] The first magnetic gap 23a and the second magnetic gap 23b are evenly spaced throughout the entire area, avoiding local magnetic field strength fluctuations caused by uneven gaps, so that the inner voice coil 31 and the outer voice coil 32 are more evenly acted upon by the magnetic field in the first magnetic gap 23a and the second magnetic gap 23b, thereby making the inner voice coil 31 and the outer voice coil 32 more stable during movement, avoiding nonlinear distortion caused by asymmetric force, and making the diaphragm vibration frequency response more accurate, which helps to reduce distortion in sound output and further improve acoustic performance.

[0050] Please combine Figures 1 to 4 In one embodiment, the first section 223 and the second section 224 of each first side magnet 221 are connected and cover the two first corners 212, and the first section 223 and the second section 224 are smoothly connected toward one side of the center magnet 21; or, the first section 223 and the second section 224 of each first side magnet 221 are disconnected to form an opening 227 at the first corner 212.

[0051] Furthermore, the third section 225 and the fourth section 226 of each second side magnet 222 are connected and cover the two first corners 212, and the third section 225 and the fourth section 226 are smoothly connected toward one side of the center magnet 21; or, the third section 225 and the fourth section 226 of each second side magnet 222 are disconnected and form an opening 227 at the corresponding first corner 212.

[0052] See also Figure 4In a specific embodiment, the first section 223 and the second section 224 of the two first side magnets 221 are connected and block the two first corners 212, and the first section 223 and the second section 224 are smoothly connected toward one side of the center magnet 21, and the third section 225 and the fourth section 226 of the two second side magnets 222 are connected and block the two first corners 212, and the third section 225 and the fourth section 226 are smoothly connected toward one side of the center magnet 21, that is, the first side magnet 221 and the second side magnet 222 both block the first corner 212, providing magnetic flux lines for the inner voice coil 31 and the outer voice coil 32 at the first corner 212, thereby maximizing the overall BL value of the sound unit 100. The first section 223 and the second section 224 are smoothly connected toward one side of the center magnet 21, and the third section 225 and the fourth section 226 are smoothly connected toward one side of the center magnet 21, so that the first magnetic gap 23a and the second magnetic gap 23b are also evenly spaced at the second corner 213, avoiding fluctuations in local magnetic field strength caused by uneven gaps, so that the inner voice coil 31 and the outer voice coil 32 are more evenly subjected to the magnetic field force in the first magnetic gap 23a and the second magnetic gap 23b.

[0053] See also Figure 3 In another specific embodiment, the central magnet 21 includes two first sides 214 arranged opposite to each other along the first direction and two second sides 215 arranged opposite to each other along the second direction, and the two ends of each first side 214 are respectively connected to the two second sides 215 to form two corners 211; the two corners 211 are respectively a first corner 212 and a second corner 213; the number of the first side magnets 221 is four, the number of the second side magnets 222 is two, the two second side magnets 222 form a second avoidance gap 24b corresponding to the second corner 213, the four first side magnets 221 form a first avoidance gap 24a corresponding to the second corner 213, and form an opening 227 corresponding to the first corner 212.

[0054] The two first side magnets 221 block the two first corners 212, and the four second side magnets 222 are respectively arranged corresponding to the four sides of the center magnet 21, so that two second avoidance gaps 24b are formed at the corresponding second corners, and two openings 227 are formed at the corresponding two first corners 212, so that only the first side magnets 221 block the two first corners 212, thereby improving the BL value of the inner voice coil 31 at the first corner 212. The second side magnets 222 are four pieces and are arranged corresponding to the four sides, so that the second side magnets can use bar magnets, without the need for additional processing of the magnets, reducing costs and improving processing efficiency.

[0055] See also Figure 5In another specific embodiment, the central magnet 21 includes two first sides 214 arranged opposite to each other along the first direction and two second sides 215 arranged opposite to each other along the second direction, and both ends of each first side 214 are respectively connected to the two second sides 215 to form two corners 211; the two corners 211 are respectively a first corner 212 and a second corner 213; the number of the first side magnets 221 is two, the number of the second side magnets 222 is four, the two first side magnets 221 correspond to the second corners 213 to form a first avoidance gap 24a, the four second side magnets 222 correspond to the second corners 213 to form a second avoidance gap 24b, and the corresponding first corners 212211 form an opening 227.

[0056] The two second side magnets 222 block the two first corners 212, and the four first side magnets 221 are respectively arranged corresponding to the four sides of the center magnet 21, so that two second avoidance gaps 24b are formed at the corresponding second corners, and two openings 227 are formed at the corresponding two first corners 212, so that only the second side magnets 222 block the two first corners 212, thereby improving the BL value of the outer voice coil 31 at the first corner 212. The first side magnets 221 are four pieces and are arranged corresponding to the four sides, so that the first side magnets can use bar magnets, without the need for additional processing of the magnets, reducing costs and improving processing efficiency.

[0057] It can be understood that, because the aforementioned content limits the need for the side magnet assembly 22 to block the first corner 212, there is no situation where both the first side magnet 221 and the second side magnet 222 form an opening 227 at the first corner 212. In the above three situations, both the first side magnet 221 and the second side magnet 222 block the first corner 212, which can maximize the BL value of the sound unit 100, thereby improving the acoustic performance of the sound unit 100. When only one of them blocks the first corner 212, the cost of processing the magnets can be reduced and the processing efficiency can be improved. In actual applications, different combinations can be selected according to specific needs and application scenarios.

[0058] In one embodiment, the first section 223 and the second section 224 are smoothly connected at one side away from the center magnet 21 to form an R angle; or, the first section 223 and the second section 224 are connected at one side away from the center magnet 21 through a beveled surface to form a C angle; the third section 225 and the fourth section 226 are smoothly connected at one side away from the center magnet 21 to form an R angle; or, the third section 225 and the fourth section 226 are connected at one side away from the center magnet 21 through a beveled surface to form a C angle.

[0059] It should be noted that when the length and width of the first section 223 and the second section 224 are similar or consistent, the side of the first section 223 and the second section 224 away from the center magnet 21 can be set to a C angle. The processing of the C angle is relatively simple, and only needs to be chamfered to achieve high processing efficiency and low processing cost. When the length and width of the first section 223 and the second section 224 are significantly different, the side of the first section 223 and the second section 224 away from the center magnet 21 can be set to an R angle, thereby increasing the strength at the corner 211 and reducing stress concentration. Similarly, when the length and width of the third section 225 and the fourth section 226 are similar or consistent, the side of the third section 225 and the fourth section 226 away from the center magnet 21 can be set to a C angle. The processing of the C angle is relatively simple, and only needs to be chamfered to achieve it, with high processing efficiency and low processing cost; when the length and width of the third section 225 and the fourth section 226 are significantly different, the side of the third section 225 and the fourth section 226 away from the center magnet 21 can be set to an R angle, thereby increasing the strength at the corner 211 and reducing stress concentration.

[0060] It can be understood that the C angle and the R angle are commonly used terms in the art, the C angle represents the corner 211 formed directly by the chamfered surface, and the R angle represents the corner 211 formed by the smooth transition of the arc surface.

[0061] In one embodiment, the central magnet 21 is a rectangular magnet, the long side of the rectangular magnet forms the first side 214, the short side of the rectangular magnet forms the second side 215, and the first side magnet 221 and / or the second side magnet 222 are L-shaped magnets.

[0062] On the one hand, rectangular magnets are easy to process, reducing the difficulty and cost of processing complex shapes during the manufacturing process. On the other hand, rectangular magnets can provide uniform magnetic field distribution, making the force on the voice coil more uniform during vibration, thereby improving the stability of the voice coil throughout the entire vibration stroke, thereby improving the acoustic performance of the sound unit 100.

[0063] Please combine Figure 3 and Figure 4 In one embodiment, an embedding groove 11 is opened at two corners 211 on the same side of the housing 1 corresponding to the central magnet 21, and a first welding pad 12 and a second welding pad 13 which are conductive to each other are respectively arranged in the two embedding grooves 11. The first welding pad 12 is conductive to one of the centering support pieces 33, and the second welding pad 13 is arranged on the same side as the other centering support piece 33 and both are conductive to the external circuit.

[0064] It can be understood that in the prior art, the voice coil is usually powered by connecting to an external circuit through two centering supports 33 to make it vibrate in the magnetic gap 23. Therefore, it is necessary to set wires at the two centering supports 33 to connect to the external circuit. In the present invention, one of the centering supports 33 is connected to the other centering support 33 through the first soldering pad 12 and the second soldering pad 13, so that the second soldering pad 13 and the other centering support 33 are located on the same side, forming a path of another centering support 33-voice coil-one of the centering supports 33-first soldering pad 12-second soldering pad 13, so that the voice coil can be powered by setting the wires on the same side, reducing the length of the wires, optimizing the layout in the sound unit 100, and further reducing the volume of the sound unit 100.

[0065] In one embodiment, the housing 1 is a non-conductive housing 1, the first pad 12 and the second pad 13 are both conductive pads, and the first pad 12 and the second pad 13 are connected via a conductive connecting rod 14. The non-conductive housing 1 effectively isolates the electrical part from the external environment, prevents the housing 1 from contacting a conductive object and causing a short circuit, improves the safety of the sound unit 100, and connects the two first pads 12 and the second pad 13 via the conductive connecting rod 14, reduces the complex layout of the internal wires, and optimizes the internal space layout of the sound unit 100.

[0066] In one embodiment, the housing 1 is an injection molded housing 1, the first pad 12 and the second pad 13 are both metal pads, the conductive connecting rod 14 is a metal connecting rod, and the first pad 12, the second pad 13, the conductive connecting rod 14 and the housing 1 are integrally injection molded. The integral injection molding ensures a firm connection between the first pad 12, the second pad 13, the conductive connecting rod 14 and the housing 1, avoids loosening or displacement problems that may be caused by vibration, impact or long-term use in traditional assembly methods, and improves stability.

[0067] In one embodiment, the housing 1 is made of a conductive material, the first pad 12 and the second pad 13 are both conductive pads, and the first pad 12 and the second pad 13 are connected through an external conductive member. The external conductive member can make the connection between the first pad 12 and the second pad 13 more flexible, make full use of the space in the sound unit, and thus reduce the volume of the sound unit 100. Specifically, the external conductive member can be an FPCB. The flexibility of the FPCB enables it to be flexibly arranged and can withstand certain bending and vibration, ensuring that the electrical connection between the pads is not affected by external impact or structural deformation.

[0068] The present invention also provides a sound module, which includes a housing and the above-mentioned sound unit 100, and the sound unit 100 is installed in the housing. The specific structure of the sound unit 100 refers to the above-mentioned embodiment. Since the sound module 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 repeated here one by one.

[0069] The present invention also proposes an electronic device, which includes a protective shell and the above-mentioned sound-emitting unit 100, and the sound-emitting unit 100 is installed in the protective shell. Specifically, the sound-emitting unit 100 can be directly installed in the protective shell of the electronic device, or the sound-emitting unit 100 can be assembled into a sound module and then installed in the protective shell of the electronic device. The specific structure of the sound-emitting unit 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 repeated here one by one.

[0070] 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-emitting unit, characterized in that: include: shell; A magnetic circuit system, the magnetic circuit system is connected to the housing, the magnetic circuit system includes a central magnet and a side magnet assembly, the side magnet assembly includes two side magnets arranged outside the central magnet in sequence from the inside to the outside, the side magnet located on the inside is arranged outside the central magnet and forms a magnetic gap between the central magnet, and another magnetic gap is formed between the two side magnets; The side magnet assembly forms two avoidance gaps, the two avoidance gaps are connected to the two magnetic gaps, the two avoidance gaps are respectively arranged corresponding to the two opposite corners of the central magnet, and the side magnet assembly blocks the remaining corners of the central magnet; A vibration system, the vibration system comprising an inner voice coil, an outer voice coil and two centering supports, the inner voice coil and the outer voice coil are nested and one end of each of the centering supports is respectively arranged corresponding to the corresponding magnetic gap, one end of each of the centering supports is connected to the outer shell, and the other end passes through the avoidance gap from the outside to the inside, extends into the other magnetic gap and is connected to the inner voice coil, and the inner voice coil is electrically connected to the outer voice coil.

2. The sound-emitting unit according to claim 1, characterized in that: The two side magnets are respectively a first side magnet and a second side magnet, the first side magnet is arranged outside the center magnet and the magnetic gap formed between the first side magnet and the center magnet is a first magnetic gap, and the second side magnet is arranged outside the first side magnet and the magnetic gap formed between the first side magnet and the center magnet is a second magnetic gap; The two avoidance gaps are respectively a first avoidance gap and a second avoidance gap, the inner voice coil is located in the first magnetic gap, the outer voice coil is located in the second magnetic gap, and the centering support plate passes through the second avoidance gap, the second magnetic gap, and the first avoidance gap from the outer shell in sequence and extends into the first magnetic gap to connect with the inner voice coil.

3. The sound-emitting unit according to claim 2, characterized in that: The central magnet includes two first sides arranged opposite to each other along a first direction and two second sides arranged opposite to each other along a second direction, and the two ends of each first side are respectively connected to the two second sides to form two corners; the two corners are respectively the first corner and the second corner; the number of the first side magnets and the second side magnets are both two, and the two first side magnets correspond to the second corners to form the first avoidance gap, and the two second side magnets correspond to the second corners to form the second avoidance gap.

4. The sound-emitting unit according to claim 3, characterized in that: The first side magnet includes a first section and a second section, and the second side magnet includes a third section and a fourth section. The first section and the third end extend along the first side, and the second section and the fourth section extend along the second side. One end of the first section and the second section of another first side magnet correspond to the second corner to form the first avoidance gap; one end of the third section and the fourth section of another second side magnet correspond to the second corner to form the second avoidance gap.

5. The sound-emitting unit according to claim 4, characterized in that: The first section, the second section, the third section and the fourth section are all arranged parallel to the central magnet so that the first side magnet and the central magnet form the first magnetic gap with uniform intervals, and the second side magnet and the first side magnet form the second magnetic gap with uniform intervals.

6. The sound-emitting unit according to claim 4, characterized in that: The first section and the second section are smoothly connected at a side away from the central magnet to form an R angle; or, the first section and the second section are connected at a side away from the central magnet through a beveled surface to form a C angle; The third section and the fourth section are smoothly connected at a side away from the central magnet to form an R angle; or, the third section and the fourth section are connected at a side away from the central magnet through a chamfered surface to form a C angle.

7. The sound-emitting unit according to claim 2, characterized in that: The central magnet includes two first sides arranged opposite to each other along a first direction and two second sides arranged opposite to each other along a second direction, and both ends of each first side are respectively connected to the two second sides to form two corners; the two corners are respectively the first corner and the second corner; the number of the first side magnets is four, and the number of the second side magnets is two, the two second side magnets correspond to the second corners to form the second avoidance gap, the four first side magnets correspond to the second corners to form the first avoidance gap, and the corresponding first corners form an opening.

8. The sound-emitting unit according to claim 2, characterized in that: The central magnet includes two first sides arranged opposite to each other along a first direction and two second sides arranged opposite to each other along a second direction, and the two ends of each first side are respectively connected to the two second sides to form two corners; the two corners are respectively the first corner and the second corner; the number of the first side magnets is two, and the number of the second side magnets is four, the two first side magnets correspond to the second corners to form the first avoidance gap, the four second side magnets correspond to the second corners to form the second avoidance gap, and the corresponding first corners form an opening.

9. The sound-emitting unit according to any one of claims 3 to 8, characterized in that: The central magnet is a rectangular magnet, the long side of the rectangular magnet forms the first side, the short side of the rectangular magnet forms the second side, and the first side magnet and / or the second side magnet are L-shaped magnets.

10. The sound-emitting unit according to any one of claims 1 to 8, characterized in that: The shell is provided with embedding grooves at two corners on the same side corresponding to the central magnet, and the two embedding grooves are respectively provided with a first welding pad and a second welding pad which are conductive to each other, the first welding pad is conductive to one of the centering support pieces, and the second welding pad is provided on the same side as the other centering support piece and both are conductive to the external circuit.

11. The sound-emitting unit according to claim 10, characterized in that: The shell is a non-conductive shell, the first pad and the second pad are both conductive pads, and the first pad and the second pad are connected via a conductive connecting rod.

12. The sound-emitting unit according to claim 11, characterized in that: The housing is an injection-molded housing, the first pad and the second pad are both metal pads, the conductive connecting rod is a metal connecting rod, and the first pad, the second pad, the conductive connecting rod and the housing are integrally injection-molded.

13. The sound-emitting unit according to claim 10, characterized in that: The shell is a conductive shell, the first pad and the second pad are both conductive pads, and the first pad and the second pad are conductively connected via an external conductive member.

14. An electronic device, characterized in that: The electronic device comprises a protective shell and a sound-emitting unit as claimed in claim 13, wherein the sound-emitting unit is installed in the protective shell.

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