Sound production monomer and sound production module

Abstract

The application discloses a sound production monomer and a sound production module, and relates to the technical field of sound energy conversion. The sound production monomer comprises a magnetic circuit system and a vibration system. The magnetic circuit system comprises a magnetic circuit unit. The magnetic circuit unit forms a first magnetic gap and a second magnetic gap. The magnetic circuit unit comprises a center magnetic circuit, an intermediate magnetic circuit and a side magnetic circuit. The intermediate magnetic circuit comprises a first intermediate magnetic circuit and a second intermediate magnetic circuit. The first magnetic gap surrounds the first intermediate magnetic circuit, and the second magnetic gap surrounds the second intermediate magnetic circuit. The vibration system comprises a vibrating diaphragm, a first voice coil, a second voice coil and a magnetic assembly. The first voice coil is located in the first magnetic gap, and the second voice coil is located in the second magnetic gap. One side of the first voice coil and the second voice coil is connected with the vibrating diaphragm, and the other side is connected with the magnetic assembly. The current directions of the first voice coil and the second voice coil are the same. The magnetic assembly can provide an acting force opposite to the restoring force direction of the vibrating diaphragm for the first voice coil and the second voice coil. The performance of the sound production monomer is improved by additionally arranging the magnetic assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of sound energy conversion, and in particular to a sound-emitting unit and a sound-emitting module. Background Art

[0002] As smart products become thinner, the limited internal space poses a huge challenge to the acoustic performance of speakers. If the size of the speaker is reduced, the performance of the speaker will be weakened. This is because traditional speakers usually improve performance by increasing the volume of the magnet to obtain better performance. However, the use of large-volume magnets will cause the size of the speaker to increase, resulting in the speaker being unable to meet size requirements. However, if the size of the speaker is reduced, the space inside the speaker will also decrease, that is, the space for accommodating the magnet may also decrease. In the case of insufficient space, only smaller magnets can be used, but the reduction in the volume of the magnet will cause the performance of the speaker to even fail to meet the requirements of the entire machine. Summary of the Invention

[0003] The main purpose of the present invention is to propose a sound unit and a sound module, aiming to solve the problem of how to improve the performance of the speaker.

[0004] To achieve the above-mentioned purpose, the sound-emitting unit proposed in the present invention includes:

[0005] A magnetic circuit system, the magnetic circuit system including a magnetic circuit unit, the magnetic circuit unit forming a first magnetic gap and a second magnetic gap, the magnetic circuit unit including a central magnetic circuit, an intermediate magnetic circuit arranged around the central magnetic circuit, and a side magnetic circuit arranged around the intermediate magnetic circuit, the intermediate magnetic circuit including a first intermediate magnetic circuit and a second intermediate magnetic circuit respectively arranged on both sides of the central magnetic circuit along the second direction, the first magnetic gap surrounding the first intermediate magnetic circuit, and the second magnetic gap surrounding the second intermediate magnetic circuit;

[0006] A vibration system that vibrates in a first direction and includes a diaphragm, a first voice coil, a second voice coil, and a magnetic assembly. The first voice coil is located in the first magnetic gap, and the second voice coil is located in the second magnetic gap. One side of the first voice coil is connected to the diaphragm, and the other side of the first voice coil is connected to the magnetic assembly. One side of the second voice coil is connected to the diaphragm, and the other side of the second voice coil is connected to the magnetic assembly. The currents in the first and second voice coils are in the same direction, and the magnetic assembly is capable of providing a force to the first and second voice coils that is opposite to the restoring force of the diaphragm.

[0007] The first voice coil and / or the second voice coil has a long side extending along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0008] In one embodiment, the sound unit also includes a shell, the vibration system and the magnetic circuit system are respectively arranged at both ends of the shell, the outer periphery of the diaphragm is connected to the shell, and the magnetic circuit system also includes a magnetic yoke, which is arranged on the side of the magnetic circuit unit away from the diaphragm, and the magnetic yoke is provided with an avoidance hole corresponding to the magnetic component.

[0009] In one embodiment, the magnetic yoke includes a middle magnetic yoke and a side magnetic yoke, the middle magnetic yoke is spaced apart from the side magnetic yoke, the central magnetic circuit and the middle magnetic circuit are both provided on the middle magnetic yoke on a side facing away from the diaphragm, and the side magnetic circuit is provided on the side magnetic yoke on a side facing away from the diaphragm;

[0010] The central magnetic circuit includes a central magnet and a central magnetic conductive plate. The central magnetic conductive plate is arranged on a side of the central magnet facing the diaphragm. Both ends of the central magnetic conductive plate along the third direction are connected to the shell.

[0011] In one embodiment, the side magnetic circuit includes a side magnet and a side magnetic conductive plate, the side magnetic conductive plate is connected to the shell, and the side of the side magnet facing the diaphragm is provided with a first connection area and a second connection area, the first connection area is connected to the center magnetic conductive plate, and the second connection area is connected to the side magnetic conductive plate.

[0012] In one embodiment, the first connection region and the second connection region are spaced apart from each other;

[0013] And / or, the side magnetic conductive plate is injection molded on the housing;

[0014] And / or, both ends of the central magnetic conductive plate are injection molded on the shell.

[0015] In one embodiment, the first intermediate magnetic circuit includes a first intermediate magnet and a first intermediate magnetic conductive plate, the second intermediate magnetic circuit includes a second intermediate magnet and a second intermediate magnetic conductive plate, and the side magnetic circuit includes a side magnet and a side magnetic conductive plate. The first intermediate magnetic conductive plate is arranged on the side of the first intermediate magnet facing the diaphragm, the second intermediate magnetic conductive plate is arranged on the side of the second intermediate magnet facing the diaphragm, and the side magnetic conductive plate is arranged on the side of the side magnet facing the diaphragm. The central magnet, the first intermediate magnet, the second intermediate magnet and the side magnet are all magnetized along the first direction, the magnetization direction of the central magnet is the same as the magnetization direction of the side magnet, and the magnetization directions of the first intermediate magnet and the second intermediate magnet are opposite to the magnetization direction of the central magnet.

[0016] In one embodiment, the magnetic circuit system further includes a magnetic yoke, which is arranged on a side of the magnetic circuit unit away from the diaphragm, and the magnetic yoke is provided with an avoidance hole corresponding to the magnetic component.

[0017] In one embodiment, the magnetic assembly includes a first magnetic part and a second magnetic part, the first magnetic part is connected to the first voice coil, the second magnetic part is connected to the second voice coil, and the avoidance hole includes a first avoidance hole and a second avoidance hole, the first avoidance hole avoids the first magnetic part, and the second avoidance hole avoids the second magnetic part.

[0018] In one embodiment, the magnetically conductive yoke includes a middle magnetically conductive yoke and a side magnetically conductive yoke, and the middle magnetically conductive yoke is spaced apart from the side magnetically conductive yoke;

[0019] The first avoidance hole and the second avoidance hole are provided between the middle magnetic conductive yoke and the side magnetic conductive yoke;

[0020] Alternatively, the intermediate magnetic conductive yoke is provided with the first avoidance hole and the second avoidance hole;

[0021] Alternatively, the first avoidance hole and the second avoidance hole are provided between the middle magnetic conductive yoke and the side magnetic conductive yokes, and on the middle magnetic conductive yoke.

[0022] In one embodiment, the first magnetic member is annular, and the first avoidance hole is annular;

[0023] And / or, the second magnetic member is annular, and the second avoidance hole is annular.

[0024] In one embodiment, the number of the first magnetic members is multiple, and the multiple first magnetic members are arranged at intervals along the circumference of the first voice coil, and the number of the first avoidance holes is the same as that of the first magnetic members and are arranged in a one-to-one correspondence;

[0025] And / or, there are multiple second magnetic members, the multiple second magnetic members are arranged at intervals along the circumference of the second voice coil, and the number of the second avoidance holes is consistent with the number of the second magnetic members and are arranged in a one-to-one correspondence.

[0026] In one embodiment, the sound unit further includes a back cover, and the back cover is arranged on a side of the magnetic yoke away from the diaphragm;

[0027] The rear cover is raised in a direction away from the diaphragm to form a avoidance groove, and the avoidance groove is arranged corresponding to the avoidance hole;

[0028] And / or, a leakage hole is provided on the magnetic yoke, and an isolation mesh hole corresponding to and connected to the leakage hole is provided on the back cover.

[0029] In one embodiment, the sound unit further includes an elastic support member, one end of the elastic support member is connected to the housing, and the first voice coil and the second voice coil are both connected to the other end of the elastic support member.

[0030] In one embodiment, the elastic support member includes a first centering support plate and a second centering support plate, the first centering support plate and the second centering support plate being spaced apart along the third direction, the first centering support plate including a first fixing portion, two first elastic arms, and two first mounting portions, the two first elastic arms being respectively disposed at two ends of the first fixing portion, the two first mounting portions being respectively disposed corresponding to one first elastic arm portion, each first mounting portion being connected to the housing, and the first fixing portion being connected to the first voice coil and the second voice coil;

[0031] The second centering support includes a second fixing portion, two second elastic arm portions and two second mounting portions, the two second elastic arm portions are respectively arranged at both ends of the second fixing portion, the two second mounting portions are respectively arranged corresponding to one second elastic arm portion, each second mounting portion is connected to the shell, and the second fixing portion is connected to the first voice coil and the second voice coil.

[0032] In one embodiment, a pad component is provided on the first centering support plate and the second centering support plate, and the pad component includes a first pad, a second pad, a third pad, and a fourth pad. The first pad and the third pad are arranged on the first fixing portion, and the second pad and the fourth pad are arranged on the second fixing portion. The first pad and the second pad are both electrically connected to the first voice coil, and the third pad and the fourth pad are both electrically connected to the second voice coil.

[0033] The present invention also provides a sound module, which includes a shell and the above-mentioned sound unit, and the sound unit is arranged in the shell.

[0034] The technical solution of the present invention drives the diaphragm to vibrate by adopting a first voice coil and a second voice coil spaced apart along a second direction, and the current directions of the first voice coil and the second voice coil are the same, and the driving force directions generated are also the same. The performance of the speaker driven by the first voice coil and the second voice coil is better than that of a single voice coil speaker. Moreover, by arranging the first voice coil and the second voice coil on the side away from the diaphragm on the magnetic component, the magnetic component will be affected by the static magnetic force. When the position of the magnetic component is in the equilibrium position, the static magnetic force on the magnetic component is zero. At this time, if the first voice coil and the second voice coil vibrate upward from the equilibrium position, the magnetic component will vibrate along with the first voice coil and the second voice coil. When the first and second voice coils move in the same direction, the resultant direction of the static magnetic forces on the magnetic assembly is upward, which is consistent with the vibration direction of the first and second voice coils, thereby effectively increasing the driving force of the first and second voice coils on the diaphragm and improving the performance of the sound unit; similarly, if the first and second voice coils vibrate downward from the equilibrium position, the magnetic assembly moves downward together with the first and second voice coils. At this time, the resultant direction of the static magnetic forces on the magnetic assembly is downward, which is consistent with the vibration direction of the first and second voice coils, thereby effectively increasing the driving force of the first and second voice coils on the diaphragm, thereby improving the performance of the sound unit without affecting the thickness of the sound unit. 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 following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0036] Figure 1 A schematic structural diagram of an embodiment of a sound-emitting unit provided by the present invention;

[0037] Figure 2 A schematic structural diagram of another perspective of an embodiment of a sound-emitting unit provided by the present invention;

[0038] Figure 3 A schematic diagram of the decomposed structure of an embodiment of a sound-emitting unit provided by the present invention;

[0039] Figure 4 A schematic cross-sectional view of an embodiment of a sound-emitting unit provided by the present invention;

[0040] Figure 5 A schematic cross-sectional view of a portion of the structure of an embodiment of a sound-emitting unit provided by the present invention;

[0041] Figure 6 A schematic cross-sectional view of a portion of the structure of another embodiment of a sound-emitting unit provided by the present invention;

[0042] Figure 7 A schematic diagram of the exploded structure of another embodiment of the sound-emitting unit provided by the present invention;

[0043] Figure 8 A schematic structural diagram of the first voice coil, the second voice coil, and the centering support provided by the present invention;

[0044] Figure 9 A schematic structural diagram of the first voice coil, the second voice coil, and the magnetic assembly provided by the present invention;

[0045] Figure 10 A schematic cross-sectional view of another embodiment of a sound-emitting unit provided by the present invention;

[0046] Figure 11 A schematic structural diagram of an embodiment of a central magnetic conductive plate and a housing provided by the present invention;

[0047] Figure 12 This is a structural schematic diagram of an embodiment of a magnetic yoke provided by the present invention.

[0048] Description of Figure Numbers:

[0049] 100. Sounding unit; 1. Magnetic circuit system; 11. Magnetic circuit unit; 111. Center magnetic circuit; 1111. Center magnet; 1112. Center magnetic plate; 112. Intermediate magnetic circuit; 1121. First intermediate magnetic circuit; 11211. First intermediate magnet; 11212. First intermediate magnetic plate; 1122. Second intermediate magnetic circuit; 11221. Second intermediate magnet; 11222. Second intermediate magnetic plate; 113. Side magnetic circuit; 1131. Side magnet; 11311. First magnet block; 11312. Second magnet block; 11313. Third magnet block; 11314. Fourth magnet block; 1132. Side magnetic plate; 114. First magnetic gap; 115. Second magnetic gap; 2. Vibration system; 21. Diaphragm; 211 , reinforcement part; 22, first voice coil; 23, second voice coil; 24, magnetic assembly; 241, first magnetic part; 242, second magnetic part; 25, magnetic yoke; 251, first avoidance hole; 252, second avoidance hole; 253, leakage hole; 254, middle magnetic yoke; 255, side magnetic yoke; 3, shell; 4, back cover; 41, isolation mesh; 42, avoidance groove; 5, elastic support member; 51, first centering support piece; 511, first fixing part; 512, first elastic arm part; 513, first mounting part; 52, second centering support piece; 521, second fixing part; 522, second elastic arm part; 523, second mounting part; 531, first soldering pad; 532, second soldering pad; 533, third soldering pad; 534, fourth soldering pad.

[0050] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0051] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making any creative efforts shall fall within the scope of protection of the present invention.

[0052] 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 under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0053] 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 for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such 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 this field to implement. When the combination of technical solutions is mutually 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.

[0054] As smart products become thinner, the limited internal space poses a huge challenge to the acoustic performance of speakers. If the size of the speaker is reduced, the performance of the speaker will be weakened. This is because traditional speakers usually improve performance by increasing the volume of the magnet to obtain better performance. However, the use of large-volume magnets will cause the size of the speaker to increase, resulting in the speaker being unable to meet size requirements. However, if the size of the speaker is reduced, the space inside the speaker will also decrease, that is, the space for accommodating the magnet may also decrease. In the case of insufficient space, only smaller magnets can be used, but the reduction in the volume of the magnet will cause the performance of the speaker to even fail to meet the requirements of the entire machine.

[0055] In view of this, it is necessary to propose a sound unit and a sound module to solve the problem of how to improve the performance of the speaker.

[0056] See also Figures 1 to 6 In one embodiment of the present invention, the sound-emitting unit 100 includes a magnetic circuit system 1 and a vibration system 2. The magnetic circuit system 1 includes a magnetic circuit unit 11, which forms a first magnetic gap 114 and a second magnetic gap 115. The magnetic circuit unit 11 includes a central magnetic circuit 111, an intermediate magnetic circuit 112 arranged on the side of the central magnetic circuit 111, and a side magnetic circuit 113 arranged on the side of the intermediate magnetic circuit 112. The intermediate magnetic circuit 112 includes a first intermediate magnetic circuit 1121 and a second intermediate magnetic circuit 1122 respectively arranged on both sides of the central magnetic circuit 111 along the second direction. The first magnetic gap 114 surrounds the first intermediate magnetic circuit 1121, and the second magnetic gap 115 surrounds the second intermediate magnetic circuit 1122. The vibration system 2 vibrates along the first direction. The vibration system 2 includes The diaphragm 21, the first voice coil 22, the second voice coil 23 and the magnetic assembly 24, the first voice coil 22 is located in the first magnetic gap 114, the second voice coil 23 is located in the second magnetic gap 115, one side of the first voice coil 22 is connected to the diaphragm 21, and the other side of the first voice coil 22 is connected to the magnetic assembly 24, one side of the second voice coil 23 is connected to the diaphragm 21, and the other side of the second voice coil 23 is connected to the magnetic assembly 24, the current directions of the first voice coil 22 and the second voice coil 23 are the same, and the magnetic assembly 24 can provide the first voice coil 22 and the second voice coil 23 with a force opposite to the restoring force of the diaphragm 21; the first voice coil 22 and / or the second voice coil 23 have a long side extending along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0057] The sound unit 100 of the present invention may be a speaker unit, and the sound unit 100 may be applied to a sound module of an electronic device, such as a computer, a mobile phone, a smart wearable device, etc. This embodiment is described by taking the sound unit 100 as a speaker unit as an example.

[0058] The technical solution of the present invention drives the diaphragm 21 to vibrate by adopting the first voice coil 22 and the second voice coil 23 spaced apart along the second direction, and the current directions of the first voice coil 22 and the second voice coil 23 are the same, and the driving force generated is also the same. The vibration of the diaphragm 21 driven by the first voice coil 22 and the second voice coil 23 has better performance than that of a single voice coil speaker; and, by arranging the first voice coil 22 and the second voice coil 23 on the side away from the diaphragm 21 on the magnetic component 24, the magnetic component 24 will be affected by the static magnetic force. When the position of the magnetic component 24 is the equilibrium position, the resultant force of the static magnetic force on the magnetic component 24 is zero. At this time, if the first voice coil 22 and the second voice coil 23 vibrate upward from the equilibrium position, the magnetic component 24 will move upward together with the first voice coil 22 and the second voice coil 23. At this time, the magnetic component 24 is affected by The resultant direction of the static magnetic force is upward, and the resultant direction of the static magnetic force on the magnetic component 24 is consistent with the vibration direction of the first voice coil 22 and the second voice coil 23, thereby effectively increasing the driving force of the first voice coil 22 and the second voice coil 23 on the diaphragm 21, and improving the performance of the sound unit 100; similarly, if the first voice coil 22 and the second voice coil 23 vibrate downward from the equilibrium position, the magnetic component 24 moves downward together with the first voice coil 22 and the second voice coil 23. At this time, the resultant direction of the static magnetic force on the magnetic component 24 is downward, and the resultant direction of the static magnetic force on the magnetic component 24 is consistent with the vibration direction of the first voice coil 22 and the second voice coil 23, which also effectively increases the driving force of the first voice coil 22 and the second voice coil 23 on the diaphragm 21, thereby improving the performance of the sound unit 100 without affecting the thickness of the sound unit 100. Among them, the first direction is Figure 4 The up and down directions shown are Figure 4 The left and right directions shown are Figure 10 Left and right directions shown.

[0059] It should be noted that when the first voice coil 22 and the second voice coil 23 are energized, the first voice coil 22 and the second voice coil 23 respectively make reciprocating cutting magnetic lines of force in the first magnetic gap 114 and the second magnetic gap 115, driving the diaphragm 21 to vibrate up and down, thereby instigating the air to make sound and completing the energy conversion between electricity and sound.

[0060] According to another embodiment of the present invention, a reinforcement portion 211 is provided on the diaphragm 21. By providing the reinforcement portion 211, the sound unit 100 has better directivity and transient response in the reproduction of high-frequency signals.

[0061] In one embodiment, the sound unit 100 further includes a shell 3 , the vibration system 2 and the magnetic circuit system 1 are respectively arranged at two ends of the shell 3 , and the outer periphery of the diaphragm 21 is connected to the shell 3 .

[0062] See also Figure 3 、 Figure 4 and Figure 7 In one embodiment, the magnetic circuit system 1 further comprises a magnetic yoke 25, which is arranged on the side of the magnetic circuit unit 11 facing away from the diaphragm 21. The magnetic yoke 25 is provided with an avoidance hole corresponding to the magnetic component 24. Optionally, the magnetic yoke 25 comprises an intermediate magnetic yoke 254 and a side magnetic yoke 255, wherein the intermediate magnetic yoke 254 and the side magnetic yoke 255 are spaced apart. The sides of the central magnetic circuit 111 and the intermediate magnetic circuit 112 facing away from the diaphragm 21 are both arranged on the intermediate magnetic yoke 254, and the side of the side magnetic circuit 113 facing away from the diaphragm 21 is arranged on the side magnetic yoke 255. Furthermore, the central magnetic circuit 111 comprises a central magnet 1111 and a central magnetic plate 1112, wherein the central magnetic plate 1112 is arranged on the side of the central magnet 1111 facing the diaphragm 21, and the central magnetic plate 1112 is connected to the housing 3 at both ends along the third direction. A central magnetic plate 1112 is connected to the shell 3 so that the central magnetic plate 1112 can support the central magnet 1111 and the central magnetic circuit 111, so that the sound unit 100 does not need to set a back cover 4 or other supporting parts on the side of the magnetic yoke 25 away from the diaphragm 21 to support and fix the intermediate magnetic yoke 254 and the central magnetic circuit 111, thereby reducing the thickness of the speaker.

[0063] See also Figure 3 、 Figure 7 and Figure 10 In one embodiment, the side magnetic circuit 113 includes a side magnet 1131 and a side magnetic conductive plate 1132. The side magnetic conductive plate 1132 is connected to the housing 3. The side of the side magnet 1131 facing the diaphragm 21 is provided with a first connection area and a second connection area. The first connection area is connected to the central magnetic conductive plate 1112, and the second connection area is connected to the side magnetic conductive plate 1132. By connecting the side magnetic conductive plates and the central magnetic conductive plate to the housing, and connecting the first connection area of ​​the side magnet to the central magnetic conductive plate 1112, the components of the magnetic circuit system 1 are securely connected to the housing 3.

[0064] According to one embodiment of the present invention, the first connection area and the second connection area are spaced apart; the side magnet 1131 includes a first magnet block 11311, a second magnet block 11312, a third magnet block 11313 and a fourth magnet block 11314 which are spaced apart in sequence along the circumference of the central magnetic circuit 111, the first magnet block 11311 and the third magnet block 11313 are located in the third direction, the second magnet block 11312 and the fourth magnet block 11314 are located in the second direction, the first magnet block 11311 and the third magnet block 11313 are provided with a first connection area on the side facing the diaphragm 21, and the second magnet block 11312 and the fourth magnet block 11314 are provided with a second connection area on the side facing the diaphragm 21, so that the central magnetic conductive plate 1112 can provide reliable support for the first magnet block 11311 and the third magnet block 11313.

[0065] According to another embodiment of the present invention, the side magnetic conductive plate 1132 is injection molded into the shell 3 ; by injection molding the side magnetic conductive plate 1132 into the shell 3 , the side magnetic conductive plate 1132 can provide support for the second magnet block 11312 and the fourth magnet block 11314 .

[0066] See also Figures 10 to 12 According to another embodiment of the present invention, both ends of the central magnetic conductive plate 1112 are injection molded on the shell 3, thereby facilitating the assembly of the sound unit 100.

[0067] In one embodiment, the first intermediate magnetic circuit 1121 includes a first intermediate magnet 11211 and a first intermediate magnetic conductive plate 11212, the second intermediate magnetic circuit 1122 includes a second intermediate magnet 11221 and a second intermediate magnetic conductive plate 11222, the side magnetic circuit 113 includes a side magnet 1131 and a side magnetic conductive plate 1132, the first intermediate magnetic conductive plate 11212 is arranged on the side of the first intermediate magnet 11211 facing the diaphragm 21, and the second intermediate magnetic conductive plate 11222 is arranged on the side of the second intermediate magnet 11221. 1221 faces the side of the diaphragm 21, and the side magnetic conductive plate 1132 is disposed on the side of the side magnet 1131 facing the diaphragm 21. The center magnet 1111, the first intermediate magnet 11211, the second intermediate magnet 11221, and the side magnet 1131 are all magnetized in a first direction. The magnetization direction of the center magnet 1111 is the same as that of the side magnet 1131, while the magnetization directions of the first intermediate magnet 11211 and the second intermediate magnet 11221 are opposite to that of the center magnet 1111. The magnetization direction of the center magnet 1111 is the same as that of the side magnet 1131, while the magnetization directions of the first intermediate magnet 11211 and the second intermediate magnet 11221 are opposite to that of the center magnet 1111. This ensures that the first voice coil 22 and the second voice coil 23 vibrate in the same direction when the current flows in the same direction, thereby ensuring the performance of the sound unit 100.

[0068] See also Figure 3 、 Figure 4 and Figure 7 In one embodiment, the magnetic circuit system 1 further includes a magnetic yoke 25, which is disposed on the side of the magnetic circuit unit 11 facing away from the diaphragm 21. The magnetic yoke 25 is provided with a relief hole corresponding to the magnetic assembly 24. The relief hole increases the downward vibration space of the magnetic assembly 24, thereby improving the performance of the sound unit 100. Furthermore, the size of the relief hole can be adjusted to vary the magnitude of the static magnetic force acting on the magnetic assembly 24, thereby making the magnitude of the static magnetic force acting on the magnetic assembly 24 adjustable.

[0069] In one embodiment, the magnetic assembly 24 includes a first magnetic member 241 and a second magnetic member 242. The first magnetic member 241 is connected to the first voice coil 22, and the second magnetic member 242 is connected to the second voice coil 23. The avoidance hole includes a first avoidance hole 251 and a second avoidance hole 252. The first avoidance hole 251 avoids the first magnetic member 241, and the second avoidance hole 252 avoids the second magnetic member 242. The size of the first avoidance hole 251 can be adjusted to change the magnitude of the static magnetic force on the first magnetic member 241, thereby adjusting the magnitude of the static magnetic force on the first magnetic member 241; the size of the second avoidance hole 252 can be adjusted to change the magnitude of the static magnetic force on the second magnetic member 242, thereby adjusting the magnitude of the static magnetic force on the second magnetic member 242.

[0070] It should be noted that the first magnetic part 241 and the second magnetic part 242 can be made of permanent magnetic materials, such as ferrite, precious metal alloy, etc.; the first magnetic part 241 and the second magnetic part 242 can also be made of magnetic conductive materials; the first magnetic part 241 and the second magnetic part 242 can also be made of soft magnetic materials, such as pure iron, nickel, etc.

[0071] See also Figure 7 、 Figure 9 and Figure 12 According to one embodiment of the present invention, the magnetic yoke 25 includes an intermediate magnetic yoke 254 and a side magnetic yoke 255, the intermediate magnetic yoke 254 and the side magnetic yoke 255 are spaced apart, the side of the central magnetic circuit 111 and the intermediate magnetic circuit 112 facing away from the diaphragm 21 are both arranged on the intermediate magnetic yoke 254, and the side of the side magnetic circuit 113 facing away from the diaphragm 21 is arranged on the side magnetic yoke 255; a first avoidance hole 251 and a second avoidance hole 252 are provided between the intermediate magnetic yoke 254 and the side magnetic yoke 255; wherein the side magnetic yoke 255 surrounds the outer periphery of the intermediate magnetic yoke 254 and is spaced apart from the intermediate magnetic yoke 254, and the first avoidance hole 251 and the second avoidance hole 252 are arranged between the intermediate magnetic yoke 254 and the side magnetic yoke 255, so that the gap between the side magnetic yoke 255 and the intermediate magnetic yoke 254 can simultaneously avoid the first magnetic member 241 and the second magnetic member 242.

[0072] According to another embodiment of the present invention, the magnetic yoke 25 includes an intermediate magnetic yoke 254 and a side magnetic yoke 255, the intermediate magnetic yoke 254 and the side magnetic yoke 255 are separated, the center magnetic circuit 111 and the intermediate magnetic circuit 112 are both arranged on the side away from the diaphragm 21 on the intermediate magnetic yoke 254, and the side of the side magnetic circuit 113 away from the diaphragm 21 is arranged on the side magnetic yoke 255; the intermediate magnetic yoke 254 is provided with a first avoidance hole 251 and a second avoidance hole 252; wherein the first magnetic component 241 and the second magnetic component 242 are located above the intermediate magnetic yoke 254, and the first magnetic component 241 and the second magnetic component 242 can be avoided respectively by opening the first avoidance hole 251 and the second avoidance hole 252 on the intermediate magnetic yoke 254.

[0073] According to another embodiment of the present invention, a first avoidance hole 251 and a second avoidance hole 252 are defined between the middle magnetic conductive yoke 254 and the side magnetic conductive yokes 255 and on the middle magnetic conductive yoke 254 . It can be that a first avoidance hole 251 is formed between the middle magnetic yoke 254 and the side magnetic yoke 255, and a second avoidance hole 252 is formed on the middle magnetic yoke 254. It can also be that a second avoidance hole 252 is formed between the middle magnetic yoke 254 and the side magnetic yoke 255, and a first avoidance hole 251 is formed on the middle magnetic yoke 254. It can also be that the number of first avoidance holes 251 is two or more, and the first avoidance holes 251 are arranged both between the side magnetic yoke 255 and the middle magnetic yoke 254 and on the middle magnetic yoke 254, and the number of second avoidance holes 252 is two or more, and the second avoidance holes 252 are arranged both between the side magnetic yoke 255 and the middle magnetic yoke 254 and on the middle magnetic yoke 254, so that the first avoidance hole 251 can avoid the first magnetic parts 241 located at different positions and different numbers, and the second avoidance hole 252 can avoid the second magnetic parts 242 located at different positions and different numbers.

[0074] According to one embodiment of the present invention, the first magnetic part 241 is annular, and the first avoidance hole 251 is annular. The first magnetic part 241 is annular, which can increase the driving force of the first magnetic part 241 on the diaphragm 21 through the first voice coil 22, thereby improving the performance of the sound unit 100. The first avoidance hole 251 is annular, which avoids the first magnetic part 241 from interfering with the magnetic yoke 25.

[0075] According to another embodiment of the present invention, the second magnetic member 242 is annular, and the second avoidance hole 252 is annular. This can increase the driving force of the second magnetic member 242 on the diaphragm 21 through the second voice coil 23, thereby improving the performance of the sound unit 100. The second avoidance hole 252 is annular to prevent interference between the second magnetic member 242 and the magnetic yoke 25.

[0076] According to one embodiment of the present invention, there are multiple first magnetic parts 241, and the multiple first magnetic parts 241 are arranged at intervals along the circumference of the first voice coil 22. The first avoidance holes 251 are consistent with the number of the first magnetic parts 241 and are arranged one-to-one; by setting multiple first magnetic parts 241, the driving force of the first magnetic part 241 on the diaphragm 21 through the first voice coil 22 can be increased, thereby improving the performance of the sound unit 100. The first avoidance holes 251 are arranged one-to-one with the first magnetic parts 241, thereby ensuring that the first magnetic part 241 has sufficient downward vibration space to avoid interference between the first magnetic part 241 and the magnetic yoke 25.

[0077] According to another embodiment of the present invention, there are multiple second magnetic members 242, and the multiple second magnetic members 242 are arranged at intervals along the circumference of the second voice coil 23. The second avoidance holes 252 are the same number as the second magnetic members 242 and are provided in a one-to-one correspondence. By providing multiple second magnetic members 242, the driving force of the second magnetic members 242 on the diaphragm 21 through the second voice coil 23 can be increased, thereby improving the performance of the sound unit 100. The second avoidance holes 252 are provided in a one-to-one correspondence with the second magnetic members 242, thereby ensuring that the second magnetic members 242 have sufficient downward vibration space and preventing interference between the second magnetic members 242 and the magnetic yoke 25.

[0078] See also Figures 4 to 6 According to one embodiment of the present invention, the sound unit 100 further includes a back cover 4, which is provided on the side of the magnetic yoke 25 away from the diaphragm 21; the back cover 4 protrudes in a direction away from the diaphragm 21 to form a avoidance groove 42, and the avoidance groove 42 is provided corresponding to the avoidance hole. By providing the avoidance groove 42 to avoid the magnetic component, the downward vibration space of the first voice coil 22 and the second voice coil 23 is increased, thereby improving the performance of the sound unit 100. The thickness and material of the back cover 4 can be selected according to whether it needs to support the magnetic yoke 25. If it needs to provide support force, a material with greater strength can be selected or the back cover 4 can be ensured to have a certain thickness, such as a metal material.

[0079] According to another embodiment of the present invention, the speaker 100 further includes a back cover 4, which is disposed on the side of the magnetic yoke 25 facing away from the diaphragm 21. The magnetic yoke 25 is provided with a leakage hole 253, and the back cover 4 is provided with an isolation mesh 41 corresponding to and connected to the leakage hole 253. The isolation mesh 41 in the back cover 4 is connected to the leakage hole 253, thereby balancing air pressure. It is understood that the back cover 4 can cover both the leakage hole 253 and the avoidance hole provided on the magnetic yoke 25.

[0080] See also Figures 7 to 9In one embodiment, the sound unit 100 further includes an elastic support member 5, one end of which is connected to the housing 3, and the first voice coil 22 and the second voice coil 23 are both connected to the other end of the elastic support member 5. The elastic support member 5 is provided to center and support the first voice coil 22 and the second voice coil 23, thereby preventing polarization of the first voice coil 22 and the second voice coil 23 and improving the vibration stability of the first voice coil 22 and the second voice coil 23.

[0081] According to one embodiment of the present invention, the elastic support member 5 includes an annular fixing portion, a mounting portion, and an elastic arm portion connecting the annular fixing portion and the mounting portion. The mounting portion is connected to the shell 3, and the first voice coil 22 and the second voice coil 23 are both connected to the annular fixing portion; the elastic support member 5 is an integral structural member, so it has better supporting stability for the first voice coil 22 and the second voice coil 23, and the use of the elastic support member 5 can also facilitate wiring.

[0082] In one embodiment, the elastic support member 5 includes a first centering support piece 51 and a second centering support piece 52. The first centering support piece 51 and the second centering support piece 52 are spaced apart along the third direction. The first centering support piece 51 includes a first fixing portion 511, two first elastic arms 512 and two first mounting portions 513. The two first elastic arms 512 are respectively arranged at both ends of the first fixing portion 511. The two first mounting portions 513 are respectively arranged corresponding to one first elastic arm 512. Each first mounting portion 513 is connected to the shell The first fixing portion 511 is connected to the first voice coil 22 and the second voice coil 23. The second centering damper 52 includes a second fixing portion 521, two second elastic arms 522, and two second mounting portions 523. The two second elastic arms 522 are respectively provided at each end of the second fixing portion 521. The two second mounting portions 523 are respectively provided for each second elastic arm 522. Each second mounting portion 523 is connected to the housing 3. The second fixing portion 521 is connected to the first voice coil 22 and the second voice coil 23. The first centering damper 51 centers and supports the first voice coil 22, thereby preventing polarization and improving the vibration stability of the first voice coil 22. The second centering damper 52 also centers and supports the second voice coil 23, thereby preventing polarization and improving the vibration stability of the second voice coil 23. Compared to using a single integral centering damper, using two separate first and second centering dampers 51 and 52 is more cost-effective. It should be noted that the first magnet block 11311 , the second magnet block 11312 , the third magnet block 11313 and the fourth magnet block 11314 are sequentially arranged at intervals to form an escape space for evading the first elastic arm portion 512 and the second elastic arm portion 522 .

[0083] In one embodiment, pad components are provided on the first and second centering supports 51 and 52. The pad components include a first pad 531, a second pad 532, a third pad 533, and a fourth pad 534. The first and third pads 531, 533 are located on the first fixing portion 511, while the second and fourth pads 532, 534 are located on the second fixing portion 521. The first and second pads 531, 532 are electrically connected to the first voice coil 22, while the third and fourth pads 533, 534 are electrically connected to the second voice coil 23. Compared to a circuit board connected to the voice coil, the sound unit 100 of this embodiment eliminates the need for a circuit board by disposing the first and third pads 531, 533 on the first fixing portion 511 and the second and fourth pads 532, 534 on the second fixing portion 521. This eliminates the need for a circuit board, thereby reducing the thickness of the sound unit 100.

[0084] According to one embodiment of the present invention, a support magnetic member is provided on the centering support, wherein the support magnetic member can be made of a permanent magnetic material, such as ferrite, precious metal alloy, etc.; the support magnetic member can also be made of a magnetic conductive material; the support magnetic member can also be made of a soft magnetic material, such as pure iron, nickel, etc.; wherein the support magnetic member will be affected by a static magnetic force, and the static magnetic force on the support magnetic member at the equilibrium position is zero. When the first voice coil 22 and the second voice coil 23 vibrate upward from the equilibrium position, the resultant direction of the static magnetic force on the support magnetic member is also upward. This force will act on the first voice coil 22 and the second voice coil 23 through the centering support. Since the resultant direction of the static magnetic force on the support magnetic member is the same as that of the first voice coil 22, the direction of the resultant force of the static magnetic force on the support magnetic member is the same as that of the first voice coil 22. The vibration direction of the first voice coil 22 and the second voice coil 23 is consistent with that of the second voice coil 23, thereby effectively increasing the driving force of the first voice coil 22 and the second voice coil 23 on the diaphragm 21, thereby effectively improving the sensitivity of the sound unit 100; similarly, when the first voice coil 22 and the second voice coil 23 vibrate downward from the equilibrium position, the resultant direction of the static magnetic force on the support magnetic part is also downward, and this force will act on the first voice coil 22 and the second voice coil 23 through the centering support. Since the resultant direction of the static magnetic force on the support magnetic part is consistent with the vibration direction of the first voice coil 22 and the second voice coil 23, the driving force of the first voice coil 22 and the second voice coil 23 on the diaphragm 21 is effectively increased, thereby effectively improving the sensitivity of the sound unit 100.

[0085] According to another embodiment of the present invention, the vibration system 2 further includes a plurality of balanced diaphragms, and the plurality of balanced diaphragms are all located on the side of the edge conductive magnetic yoke 255 away from the diaphragm 21. The plurality of balanced diaphragms are divided into a first balanced diaphragm group and a second balanced diaphragm group. The first balanced diaphragm group is arranged corresponding to the first voice coil 22. The first balanced diaphragm group includes a plurality of first balanced diaphragms, and the plurality of first balanced diaphragms are arranged at intervals along the circumference of the first voice coil 22. One end of some of the first balanced diaphragms is connected to the edge conductive magnetic yoke 255, and the other end is connected to the first magnetic member 241 or the first voice coil 22. One end of another portion of the first diaphragms 21 is connected to the intermediate conductive magnetic yoke 254, and the other end is connected to the third magnetic member or the first voice coil 22. , thereby balancing the first voice coil 22; the second balanced diaphragm group is arranged corresponding to the second voice coil 23, and the second balanced diaphragm group includes a plurality of second balanced diaphragms, and the plurality of second balanced diaphragms are arranged at intervals along the circumference of the second voice coil 23, one end of some second balanced diaphragms is connected to the side magnetic yoke 255, and the other end is connected to the second magnetic member 242 or the second voice coil 23, and one end of another part of the second diaphragm 21 is connected to the middle magnetic yoke 254, and the other end is connected to the fourth magnetic member or the second voice coil 23, thereby balancing the second voice coil 23, and the side magnetic circuit 113 is provided with a connecting hole for avoiding the balanced diaphragm, and the number of the connecting holes is consistent with that of the balanced diaphragm and is arranged one-to-one.

[0086] The present invention also provides a sound module, comprising a housing and the aforementioned sound unit 100, disposed within the housing. The sound module can be a speaker module. The sound module can be used in electronic devices such as computers, mobile phones, and smart wearable devices. Because the sound module utilizes all of the technical solutions of all of the aforementioned embodiments, it possesses at least all of the beneficial effects brought about by the technical solutions of the aforementioned embodiments, and no further elaboration is given here.

[0087] The above are merely exemplary embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's description and drawings, or direct / indirect application in other related technical fields, within the technical concept of the present invention, are included in the patent protection scope of the present invention.

Claims

1. A sound-emitting unit, characterized in that: include: A magnetic circuit system, the magnetic circuit system including a magnetic circuit unit, the magnetic circuit unit forming a first magnetic gap and a second magnetic gap, the magnetic circuit unit including a central magnetic circuit, an intermediate magnetic circuit arranged around the central magnetic circuit, and a side magnetic circuit arranged around the intermediate magnetic circuit, the intermediate magnetic circuit including a first intermediate magnetic circuit and a second intermediate magnetic circuit respectively arranged on both sides of the central magnetic circuit along a second direction, the first magnetic gap surrounding the first intermediate magnetic circuit, and the second magnetic gap surrounding the second intermediate magnetic circuit; A vibration system that vibrates in a first direction and includes a diaphragm, a first voice coil, a second voice coil, and a magnetic assembly. The first voice coil is located in the first magnetic gap, and the second voice coil is located in the second magnetic gap. One side of the first voice coil is connected to the diaphragm, and the other side of the first voice coil is connected to the magnetic assembly. One side of the second voice coil is connected to the diaphragm, and the other side of the second voice coil is connected to the magnetic assembly. The currents in the first and second voice coils are in the same direction, and the magnetic assembly is capable of providing a force to the first and second voice coils that is opposite to the restoring force of the diaphragm. The first voice coil and / or the second voice coil has a long side extending along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

2. The sound-emitting unit according to claim 1, characterized in that: The sound unit also includes a shell, the vibration system and the magnetic circuit system are respectively arranged at both ends of the shell, the outer periphery of the diaphragm is connected to the shell, and the magnetic circuit system also includes a magnetic yoke, which is arranged on the side of the magnetic circuit unit away from the diaphragm, and the magnetic yoke is provided with an avoidance hole corresponding to the magnetic component.

3. The sound-emitting unit according to claim 2, characterized in that: The magnetic yoke includes a middle magnetic yoke and a side magnetic yoke, the middle magnetic yoke is spaced apart from the side magnetic yoke, the central magnetic circuit and the middle magnetic circuit are both arranged on the middle magnetic yoke on a side away from the diaphragm, and the side magnetic circuit is arranged on the side magnetic yoke on a side away from the diaphragm; The central magnetic circuit includes a central magnet and a central magnetic conductive plate. The central magnetic conductive plate is arranged on a side of the central magnet facing the diaphragm. Both ends of the central magnetic conductive plate along the third direction are connected to the shell.

4. The sound-emitting unit according to claim 3, characterized in that: The side magnetic circuit includes a side magnet and a side magnetic conductive plate, the side magnetic conductive plate is connected to the shell, and the side of the side magnet facing the diaphragm is provided with a first connection area and a second connection area, the first connection area is connected to the center magnetic conductive plate, and the second connection area is connected to the side magnetic conductive plate.

5. The sound-emitting unit according to claim 4, characterized in that: The first connection area and the second connection area are spaced apart; And / or, the side magnetic conductive plate is injection molded on the housing; And / or, both ends of the central magnetic conductive plate are injection molded on the shell.

6. The sound-emitting unit according to claim 1, wherein: The first intermediate magnetic circuit includes a first intermediate magnet and a first intermediate magnetic conductive plate, the second intermediate magnetic circuit includes a second intermediate magnet and a second intermediate magnetic conductive plate, and the side magnetic circuit includes a side magnet and a side magnetic conductive plate. The first intermediate magnetic conductive plate is arranged on the side of the first intermediate magnet facing the diaphragm, the second intermediate magnetic conductive plate is arranged on the side of the second intermediate magnet facing the diaphragm, and the side magnetic conductive plate is arranged on the side of the side magnet facing the diaphragm. The central magnet, the first intermediate magnet, the second intermediate magnet and the side magnet are all magnetized along the first direction. The magnetization direction of the central magnet is the same as the magnetization direction of the side magnet, and the magnetization directions of the first intermediate magnet and the second intermediate magnet are opposite to the magnetization direction of the central magnet.

7. The sound-emitting unit according to claim 2, characterized in that: The magnetic assembly includes a first magnetic part and a second magnetic part, the first magnetic part is connected to the first voice coil, and the second magnetic part is connected to the second voice coil. The avoidance hole includes a first avoidance hole and a second avoidance hole, the first avoidance hole avoids the first magnetic part, and the second avoidance hole avoids the second magnetic part.

8. The sound-emitting unit according to claim 7, characterized in that: The magnetic yoke includes a middle magnetic yoke and a side magnetic yoke, the middle magnetic yoke is spaced apart from the side magnetic yoke, the central magnetic circuit and the middle magnetic circuit are both arranged on the middle magnetic yoke on a side away from the diaphragm, and the side magnetic circuit is arranged on the side magnetic yoke on a side away from the diaphragm; The first avoidance hole and the second avoidance hole are provided between the middle magnetic conductive yoke and the side magnetic conductive yoke; Alternatively, the intermediate magnetic conductive yoke is provided with the first avoidance hole and the second avoidance hole; Alternatively, the first avoidance hole and the second avoidance hole are provided between the middle magnetic conductive yoke and the side magnetic conductive yokes, and on the middle magnetic conductive yoke.

9. The sound-emitting unit according to claim 7, characterized in that: The first magnetic member is annular, and the first avoidance hole is annular; And / or, the second magnetic member is annular, and the second avoidance hole is annular.

10. The sound-emitting unit according to claim 7, characterized in that: There are a plurality of first magnetic members, and the plurality of first magnetic members are arranged at intervals along the circumference of the first voice coil. The number of the first avoidance holes is the same as that of the first magnetic members and they are arranged in a one-to-one correspondence. And / or, there are multiple second magnetic members, the multiple second magnetic members are arranged at intervals along the circumference of the second voice coil, and the number of the second avoidance holes is consistent with the number of the second magnetic members and are arranged in a one-to-one correspondence.

11. The sound-emitting unit according to claim 2, wherein: The sound-emitting unit further includes a rear cover, which is arranged on a side of the magnetic yoke away from the diaphragm; The rear cover is raised in a direction away from the diaphragm to form a avoidance groove, and the avoidance groove is arranged corresponding to the avoidance hole; And / or, a leakage hole is provided on the magnetic yoke, and an isolation mesh hole corresponding to and connected to the leakage hole is provided on the back cover.

12. The sound-emitting unit according to any one of claims 2 to 5, characterized in that: The sound unit further includes an elastic support member, one end of which is connected to the shell, and the first voice coil and the second voice coil are both connected to the other end of the elastic support member.

13. The sound-emitting unit according to claim 12, wherein: The elastic support member includes a first centering support plate and a second centering support plate, the first centering support plate and the second centering support plate being spaced apart along the third direction, the first centering support plate including a first fixing portion, two first elastic arms, and two first mounting portions, the two first elastic arms being respectively disposed at two ends of the first fixing portion, the two first mounting portions being respectively disposed corresponding to one first elastic arm portion, each first mounting portion being connected to the housing, and the first fixing portion being connected to the first voice coil and the second voice coil; The second centering support includes a second fixing portion, two second elastic arm portions and two second mounting portions, the two second elastic arm portions are respectively arranged at both ends of the second fixing portion, the two second mounting portions are respectively arranged corresponding to one second elastic arm portion, each second mounting portion is connected to the shell, and the second fixing portion is connected to the first voice coil and the second voice coil.

14. The sound-emitting unit according to claim 13, wherein: A pad component is provided on the first centering support plate and the second centering support plate, and the pad component includes a first pad, a second pad, a third pad, and a fourth pad. The first pad and the third pad are arranged on the first fixing portion, and the second pad and the fourth pad are arranged on the second fixing portion. The first pad and the second pad are both electrically connected to the first voice coil, and the third pad and the fourth pad are both electrically connected to the second voice coil.

15. A sound module, characterized in that: The sound module includes a housing and a sound unit according to any one of claims 1 to 14, and the sound unit is arranged in the housing.

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