CN116055960A

CN116055960A - Kernel of speaker module, speaker module and electronic equipment

Info

Publication number: CN116055960A
Application number: CN202210738462.8A
Authority: CN
Inventors: 刘金华; 褚建飞; 王传果
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2022-06-27
Filing date: 2022-06-27
Publication date: 2023-05-02
Anticipated expiration: 2042-06-27
Also published as: CN116055960B

Abstract

The application provides a kernel of speaker module, speaker module and electronic equipment relates to electronic product technical field, can attenuate the thickness of kernel. Wherein the kernel comprises: the voice coil is fixedly connected to the vibrating diaphragm group; the magnetic circuit system is positioned at one side of the vibrating diaphragm group and is used for being matched with the voice coil to drive the vibrating diaphragm group to vibrate, the magnetic circuit system is provided with a magnetic gap, a first avoidance groove is formed in the surface of one side of the magnetic circuit system facing the vibrating diaphragm group, and the first avoidance groove is positioned at one side of the magnetic gap, which is far away from the central axis of the magnetic circuit system; the electric connecting piece is connected with the voice coil loudspeaker voice coil electricity, and in the vibration direction of vibrating diaphragm group, the electric connecting piece is located between vibrating diaphragm group and the magnetic circuit, and the partly in first groove of dodging of electric connecting piece.

Description

Kernel of speaker module, speaker module and electronic equipment

Technical Field

The application relates to the technical field of electronic products, in particular to a kernel of a loudspeaker module, the loudspeaker module and electronic equipment.

Background

Electronic devices such as personal computers (personal computer, PCs), tablets, mobile phones, etc. are required to be designed to be thinner and lighter due to consumption requirements. In particular, in the foldable electronic device, the overall thickness of the electronic device is thick in the folded state, so that the demand for light and thin electronic devices is more urgent. Meanwhile, with the increase of consumer demand, the electronic devices are required to achieve better audio experience. Therefore, there is a need to design a speaker having both light and thin and audio effects.

Disclosure of Invention

The embodiment of the application provides a kernel of speaker module, speaker module and electronic equipment, is favorable to reducing electronic equipment's thickness, improves the sound effect.

In order to achieve the above purpose, the embodiments of the present application adopt the following technical solutions:

in a first aspect, an embodiment of the present application provides a core of a speaker module, including: the voice coil is fixedly connected to the vibrating diaphragm group; the magnetic circuit system is positioned at one side of the vibrating diaphragm group and is used for being matched with the voice coil to drive the vibrating diaphragm group to vibrate, the magnetic circuit system is provided with a magnetic gap, a first avoidance groove is formed in the surface of one side of the magnetic circuit system facing the vibrating diaphragm group, and the first avoidance groove is positioned at one side of the magnetic gap, which is far away from the central axis of the magnetic circuit system; the electric connecting piece is connected with the voice coil loudspeaker voice coil electricity, and in the vibration direction of vibrating diaphragm group, the electric connecting piece is located between vibrating diaphragm group and the magnetic circuit, and the partly in first groove of dodging of electric connecting piece.

According to the inner core, the electric connecting piece is arranged between the vibrating diaphragm group and the magnetic circuit system, meanwhile, the avoiding groove for avoiding the electric connecting piece is formed in the magnetic circuit system, so that the electric connecting piece can be arranged by utilizing the original vibrating space reserved for vibration of the vibrating diaphragm group between the vibrating diaphragm group and the magnetic circuit system, thickness superposition of other structures (such as a basin frame and the like) of the electric connection and the inner core is avoided, interference between the vibrating diaphragm group and the electric connection can be avoided through the first avoiding groove, the acoustic performance of the inner core can be guaranteed, the thickness of the inner core is reduced, the thickness of a loudspeaker module can be reduced, and thin design of electronic equipment is facilitated.

In a possible implementation manner of the first aspect, the magnetic circuit system includes: the magnetic induction device comprises a central magnet, side magnets and an edge magnetic yoke, wherein the side magnets are arranged around the periphery of the central magnet, the magnetizing direction of the side magnets is opposite to that of the central magnet, and a magnetic gap is formed between the side magnets and the central magnet; the edge magnetic yoke is laminated on the surface of the edge magnet, which faces towards the vibrating diaphragm group, and the surface of the edge magnetic yoke, which faces away from the edge magnet, is provided with a first avoidance groove. A specific structure of a magnetic circuit system is provided.

In a possible implementation manner of the first aspect, a surface of the edge magnetic yoke facing away from the diaphragm set is adapted to a surface of the edge magnet facing toward the diaphragm set. That is, the surface of the edge magnetic yoke facing away from the diaphragm group has the same shape as the surface of the edge magnet facing toward the diaphragm group. In this way, the surface of the edge magnetic yoke facing away from the diaphragm group and the surface of the edge magnet facing toward the diaphragm group can be fitted to each other. Therefore, on one hand, the area of the side magnet which can be covered and attached by the edge magnetic yoke is increased, so that magnetic lines of force of the side magnet can be converged in a magnetic gap through the edge magnetic yoke, the magnetic field driving force of the magnetic circuit system can be effectively increased, and the acoustic performance of the inner core is improved; on the other hand, the fixing area between the side magnet and the edge magnetic yoke is favorably improved, and the connection strength of the side magnet and the edge magnetic yoke is improved, so that the overall structural strength of the inner core is favorably improved.

In a possible implementation manner of the first aspect, the edge magnetic yoke is provided with a recess for avoiding the diaphragm set, the recess includes a recess bottom wall opposite to the diaphragm set, and the first avoiding groove is formed on the recess bottom wall. Thus, the thickness of the inner core in the Z-axis direction can be reduced while the vibration space of the vibrating diaphragm group is ensured.

In a possible implementation manner of the first aspect, a surface of the side magnet facing the diaphragm set is provided with a sink groove, the sink groove is recessed towards a direction away from the diaphragm set, and the sink groove comprises a sink groove bottom wall facing the diaphragm set; the edge magnetic conduction yoke comprises a first magnetic conduction part and a second magnetic conduction part, the second magnetic conduction part is connected to the first magnetic conduction part, at least part of the second magnetic conduction part protrudes towards the direction away from the vibrating diaphragm group relative to the first magnetic conduction part, the first avoiding groove is formed in the second magnetic conduction part, and the second magnetic conduction part is arranged on the bottom wall of the sinking groove in a lamination mode.

Therefore, at least part of the second magnetic conduction part protrudes out of the first magnetic conduction part towards the direction away from the vibrating diaphragm group, so that the first avoiding groove can be prevented from penetrating through the surface of the edge magnetic conduction yoke, which is away from the vibrating diaphragm group. Meanwhile, a sinking groove for avoiding the second magnetic conduction part is formed in the side magnet, so that the second magnetic conduction part is arranged on the bottom wall of the sinking groove in a lamination mode. Therefore, the area of the surface of the edge magnetic yoke, which is far away from the vibrating diaphragm group, can be increased, the contact area of the edge magnet and the edge magnetic yoke is increased, on one hand, the area of the edge magnet, which can be covered and attached by the edge magnetic yoke, is increased, so that magnetic lines of force of the edge magnet can be converged in a magnetic gap through the edge magnetic yoke, further, the magnetic field driving force of a magnetic circuit system can be effectively increased, and the acoustic performance of the inner core is improved; on the other hand, the fixing area between the side magnet and the edge magnetic yoke is favorably improved, and the connection strength of the side magnet and the edge magnetic yoke can be further improved, so that the overall structural strength of the inner core is favorably improved.

In some embodiments, a surface of the second magnetic conductive portion facing away from the diaphragm set is attached to a bottom wall of the sink groove.

In a possible implementation manner of the first aspect, the side magnet includes a first side magnetic portion and a second side magnetic portion, the second side magnetic portion is fixedly connected to a surface of the first side magnetic portion, which is far away from the center magnet, and a magnetization direction of the first side magnetic portion is the same as a magnetization direction of the second side magnetic portion; the distance between the surface of the first side magnetic part facing the vibrating diaphragm group and the reference plane is a first distance, the distance between the surface of the second side magnetic part facing the vibrating diaphragm group and the reference plane is a second distance, and the first distance is unequal to the second distance so as to define a sink between the first side magnetic part and the second side magnetic part, wherein the reference plane is perpendicular to the vibrating direction of the vibrating diaphragm group. The first magnetic conduction part is arranged on the first side magnetic part in a lamination mode, and the second magnetic conduction part is arranged on the second side magnetic part in a lamination mode. Therefore, the sinking groove can be defined between the first side magnetic part and the second side magnetic part, and the surface of the edge magnetic yoke, which is far away from the vibrating diaphragm group, can be matched with the surface of the side magnet, which is far towards the vibrating diaphragm group.

In a possible implementation manner of the first aspect, the reference plane is located on a side of the diaphragm set facing away from the magnetic circuit, and the first distance is smaller than the second distance. Therefore, the size of the first side magnetic part in the Z-axis direction is larger than that of the second side magnetic part in the Z-axis direction, and the magnetic field strength of the magnetic circuit system is increased.

In one possible implementation manner of the first aspect, the electrical connector includes a first end portion and a connection branch, the first end portion is connected to the voice coil, the connection branch includes a fixed segment and a movable segment, one end of the movable segment is connected to the first end portion, the other end of the movable segment is connected to the fixed segment, the fixed segment is connected to the first avoiding groove, and the movable segment is suspended. Like this, through with fixed section connect in first dodging the inslot, can reduce the size of connecting the hollow part (also being the movable section) in the minor matters to can reduce the size of dodging the space on the magnetic circuit, be favorable to increasing magnetic circuit's volume, improve magnetic field strength, and then can promote the acoustic properties of kernel.

In a possible implementation manner of the first aspect, the magnetic circuit system is provided with an avoidance space for avoiding the movable section. Because the movable segment that is close to first tip is when vibrating along with the removal of voice coil, and its vibration amplitude is bigger, in this application embodiment, through setting up on magnetic circuit for above-mentioned dodging the space for the movable segment is unsettled, can avoid magnetic circuit to the vibration production interference of electric connection spare, thereby can avoid electric connection spare to beat magnetic circuit to produce the noise, is favorable to improving the acoustic properties of kernel.

In one possible implementation manner of the first aspect, a first avoidance gap is formed on the side magnet, a second avoidance gap corresponding to the first avoidance gap is formed on the edge magnetic yoke, and the first avoidance gap and the second avoidance gap jointly define a avoidance space.

In a possible implementation manner of the first aspect, the kernel further includes: the basin frame is in an annular frame shape, and the magnetic circuit system is fixed on the basin frame; the conductive piece is fixed in the basin frame, and the conductive piece includes first pad, second pad and electrically conductive section, and electrically conductive section connects between first pad and second pad, and first pad is used for being connected with the electric connection piece electricity, and the second pad is used for being connected with external circuit electricity.

In a possible implementation manner of the first aspect, the electrical connector includes a first end, a connection stub, and a second end, at least a portion of the connection stub is connected between the first end and the second end, the first end is electrically connected with the voice coil, and the second end is electrically connected with the first pad.

In a possible implementation manner of the first aspect, the conductive member is embedded in the basin frame, and the welding surface of the first bonding pad is exposed, and the welding surface of the second bonding pad is exposed.

In a possible implementation manner of the first aspect, the conductive member and the basin stand are of a unitary structure.

In a possible implementation manner of the first aspect, the basin stand includes a first outer surface and a first inner surface opposite to each other, the first inner surface faces the central axis of the magnetic circuit system, a support plate is disposed on the first inner surface, one end of the support plate is fixedly connected with the first inner surface, the other end of the support plate extends towards a direction deviating from the first outer surface, and the first bonding pad of the conductive member is embedded in the support plate.

In a possible implementation manner of the first aspect, the edge magnetic yoke and the basin stand are of a unitary structure.

In a possible implementation manner of the first aspect, the electrical connector is connected to the first avoidance groove through a buffer material. Because the buffer material has certain deformability, when the electric connector vibrates under the drive of the voice coil, the buffer material can weaken interference generated to the vibration of the electric connector by utilizing the deformation of the buffer material, so that on one hand, the electric connector can be further prevented from beating the magnetic circuit system on the premise of not influencing the vibration of the voice coil and the electric connector, noise of the inner core is further avoided, and the sound emitting effect of the inner core is improved; on the other hand, the connecting stress between the magnetic circuit system and the fixed section can be reduced, and fatigue fracture of the electric connecting piece can be avoided.

In one possible implementation of the first aspect, the buffer material is an adhesive glue. Therefore, the adhesive can realize the connection between the electric connector and the magnetic circuit system and also can play a certain role in buffering.

In a possible implementation manner of the first aspect, the side magnets include a first side magnet, a second side magnet, a third side magnet and a fourth side magnet that are disposed at intervals, the first side magnet and the second side magnet are disposed on opposite sides of the center magnet, respectively, and the third side magnet and the fourth side magnet are disposed on opposite sides of the center magnet, respectively; the edge magnetic yoke comprises a first edge magnetic yoke, a second edge magnetic yoke, a third edge magnetic yoke and a fourth edge magnetic yoke which are arranged at intervals, wherein the first edge magnetic yoke is arranged on the first side magnet in a laminated mode, the second edge magnetic yoke is arranged on the second side magnet in a laminated mode, the third edge magnetic yoke is arranged on the third side magnet in a laminated mode, and the fourth edge magnetic yoke is arranged on the fourth side magnet in a laminated mode; the first edge magnetic yoke and the second edge magnetic yoke are respectively provided with a first avoiding groove.

In a possible implementation manner of the first aspect, the first side magnet is L-shaped.

In one possible implementation manner of the first aspect, the first edge magnetic yoke is L-shaped.

In a second aspect, the application provides a speaker module, including the inner core in casing and the above-mentioned arbitrary embodiment, the inner core sets up in the casing, and the casing is divided into front chamber and back chamber by the vibrating diaphragm group, and voice coil and magnetic circuit all are located back intracavity, are equipped with the passageway of making a sound on the casing, front chamber and passageway intercommunication of making a sound.

Because the loudspeaker module provided by the embodiment of the application comprises the inner core according to any technical scheme, the two can solve the same problem and achieve the same effect.

In a third aspect, the application provides an electronic device, including a housing, a circuit board and a speaker module in any of the above embodiments, where the circuit board and the speaker module are disposed in the housing, and the speaker module is electrically connected to the circuit board, and a sound outlet is disposed on the housing, and the sound outlet is communicated with the sound outlet.

Because the electronic device provided by the embodiment of the application comprises the loudspeaker module set according to any one of the technical schemes, the two can solve the same problem and achieve the same effect.

Drawings

FIG. 1a is a perspective view of a core provided in some of the related art of the present application;

FIG. 1b is a schematic cross-sectional view of the core of FIG. 1a taken along line A-A;

FIG. 1c is a schematic view of the assembly of the basin stand, magnetic circuit and electrical connection of the core shown in FIG. 1 b;

FIG. 2 is a perspective view of an electronic device provided in some embodiments of the present application;

fig. 3 is a schematic structural view of the electronic device shown in fig. 2 in a folded state

Fig. 4 is a perspective view of a support device in the electronic apparatus shown in fig. 2-3;

fig. 5 is an exploded view of the first housing, circuit board, speaker module and battery of the electronic device shown in fig. 2-3;

fig. 6 is a perspective view of the speaker module of the exploded view of fig. 5;

fig. 7 is a cross-sectional view of the speaker module of fig. 6 taken along line B-B;

FIG. 8 is a schematic diagram of the core of the speaker module of FIG. 6;

FIG. 9 is an exploded view of the core of FIG. 8;

fig. 10 is a perspective view of a basin stand in the core of fig. 8-9;

FIG. 11 is an exploded view of the vibration system of the core of FIG. 9;

FIG. 12 is a perspective view of the diaphragm assembly of FIG. 11 in an exploded view;

FIG. 13 is a perspective cross-sectional view of the diaphragm assembly of FIG. 12 taken along line C-C;

FIG. 14 is a perspective view of the voice coil of the exploded view of FIG. 11;

FIG. 15 is a schematic view illustrating assembly of the voice coil of FIG. 14, the diaphragm assembly of FIG. 12, and the basin stand of FIG. 10;

FIG. 16 is a schematic view showing the assembly of a voice coil, electrical connectors and basin stand of FIG. 10 in the vibration system of FIG. 11;

FIG. 17a is a schematic view of the conductive element of the vibration system of FIG. 11;

FIG. 17b is a schematic view illustrating the assembly of the conductive member of the vibration system of FIG. 11 with the basin stand of FIG. 10;

FIG. 18 is a schematic view of the assembled schematic view of FIG. 17b at another angle;

FIG. 19 is a schematic view showing the assembly of a voice coil, electrical connections, conductive members and the basin stand of FIG. 10 in the vibration system of FIG. 11;

FIG. 20 is a cross-sectional view of the assembly schematic shown in FIG. 19, taken along line D-D;

FIG. 21 is a cross-sectional view of the core shown in FIG. 8, taken along line E-E;

FIG. 22 is a schematic diagram of the assembly of the magnetic circuit, frame, electrical connection, voice coil in the core of FIG. 8;

FIG. 23 is a cross-sectional view of the assembled schematic shown in FIG. 22, taken along line F-F;

FIG. 24 is a perspective view of the magnetic circuit system in the core of FIG. 9;

FIG. 25 is an exploded view of the magnetic circuit system of FIG. 24;

FIG. 26 is a schematic diagram of a first side magnet of the magnetic circuit system shown in FIG. 25;

FIG. 27 is an enlarged view of the area A of FIG. 21;

FIG. 28 is a schematic view of an edge yoke of the magnetic circuit system shown in FIG. 25;

FIG. 29 is a cross-sectional view of the core of FIG. 8 taken along line G-G;

FIG. 30 is a schematic view illustrating assembly of the edge yoke of FIG. 28 with the basin stand of FIG. 10;

FIG. 31 is a cross-sectional view of an inner core provided in further embodiments of the present application;

FIG. 32 is a schematic diagram of the assembly of the magnetic system, conductive elements in the core of FIG. 31;

FIG. 33 is a schematic diagram of the assembly of a magnetic system, conductive elements in a core, as provided by further embodiments of the present application.

Reference numerals:

100. an electronic device;

10. folding the screen; 11. a first portion; 12. a second portion; 13. a third section;

20. a support device; 21. a first housing; 211. a first middle frame; 212. a first back cover; 22. a second housing; 23. a rotating mechanism; 21a, a sound outlet hole;

30. a circuit board;

40. a battery;

50. a speaker module; 50a, sound emitting channels; 501. a housing; 502. a kernel; 51. a basin stand; 511. a frame; 5111. a first edge; 5112. a second edge portion; 5113. a third side portion; 5114. a fourth side section; 511a, a first top surface; 511b, a first bottom surface; 511c, a first inner side; 511d, a first outer side; 512. positioning the protruding blocks; 513. a support plate; 52. a vibration system; 521. a diaphragm group; 5211. a dome; 5212. a vibrating diaphragm; 5212a, a first fixing portion; 5212b, tuck ring; 5212c, a second fixing portion; 522. a voice coil; 5221. a first short side segment; 5222. a second short side section; 5223. a first long side section; 5224. a second long side section; 5225. a lead-out terminal; 522a, voice coil top surface; 522b, voice coil bottom surface; 523. an electrical connection; 5231. a first end; 5232. a second end; 5233. connecting branches; 5233a, active segment; 5233b, fixed segment; 524. a conductive member; 5241. a conducting section; 5241a, a body section; 5241b, a first transition section; 5241c, a second transition section; 5242. a first bonding pad; 5243. a second bonding pad; 525. a first balance member; 526. a second balance member; 53. a magnetic circuit system; K. a magnetic gap; 53a, avoidance space; 531. a center magnet; 532. a side magnet; 532a, a first avoidance gap; 532b, sink; 5321. a first side magnet; 5321a, a first surface; 5321b, a second surface; 5321c, a second interior side; 5321d, a second exterior side; 5321e, a first magnetic shunt; 5321e1, a main body; 5321e2, an extension; 5321f, a second side magnetic portion; 5322. a second side magnet; 5323. a third side magnet; 5324. a fourth magnet; 533. a center yoke; 534. an edge magnetic yoke; 534a, a second avoidance gap; 534b, a first avoidance slot; 534c, avoiding grooves; 5341. a connection frame portion; 5342. a first edge magnetic yoke; 5342a, a first magnetic conductive portion; 5342b, a second magnetic conductive portion; 5343. a second edge magnetic yoke; 5344. a third edge yoke; 5345. a fourth edge yoke; 535. a lower yoke; 535a, locating a notch; 55. a buffer material; 503. an electrical connection structure.

Detailed Description

In the embodiments of the present application, the terms "exemplary" or "such as" and the like are used to denote examples, illustrations, or descriptions. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

In the present embodiments, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.

In the description of embodiments of the present application, the term "at least one" means one or more, and "a plurality" means two or more. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b, or c may represent: a, b, c, a b, a c, b c, or a b c, wherein a, b, c may be single or plural.

In the description of embodiments of the present application, the term "and/or" refers to and encompasses any and all possible combinations of one or more of the associated listed items. The term "and/or" is an association relationship describing an associated object, and means that there may be three relationships, for example, a and/or B, and may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" in the present application generally indicates that the front-rear association object is an or relationship.

In the description of the embodiments of the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and for example, "connected" may be either detachably connected or non-detachably connected; may be directly connected or indirectly connected through an intermediate medium. References to directional terms in the embodiments of the present application, such as "inner", "outer", "upper", "lower", "front", "rear", "left", "right", etc., are merely with reference to the directions of the drawings, and thus, the directional terms are used for better, more clear description and understanding of the embodiments of the present application, rather than indicating or implying that the apparatus or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the embodiments of the present application.

In the description of embodiments of the present application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Referring to fig. 1 a-1 b, fig. 1a is a perspective view of a core 502 provided in some related art in the present application, and fig. 1b is a schematic cross-sectional structure of the core 502 at A-A line shown in fig. 1 a. The inner core 502 includes a bobbin 51, a diaphragm set 521, a voice coil 522, a magnetic circuit 53, and an electrical connector 523.

The basin stand 51 is used for supporting and fixing the diaphragm set 521 and the magnetic circuit system 53. Specifically, the frame 51 is in an annular frame shape, and the diaphragm set 521 is fixed to an axial end surface of the frame 51. The magnetic circuit system 53 includes a center magnet 531, side magnets 532, and an edge yoke 534. The side magnets 532 are disposed around the circumference of the center magnet 531. The side magnets 532 and the center magnets 531 define a magnetic gap K therebetween. An edge yoke 534 is provided on the surface of the edge magnet 532 facing the diaphragm group 521. The outer peripheral edge of the edge yoke 534 is fixed to the inner peripheral wall of the tub 51.

The voice coil 522 is fixed to the diaphragm set 521, and a portion of the voice coil 522 away from the diaphragm set 521 extends into the magnetic gap K, so that the magnetic circuit system 53 may cooperate with the voice coil 522 to drive the diaphragm set 521 to vibrate. The electrical connector 523 is electrically connected to the voice coil 522, and the voice coil 522 may be electrically connected to an external circuit (e.g., a circuit board of an electronic device) by the electrical connector 523.

After the voice coil 522 is energized, an induced magnetic field may be generated, the magnetic circuit system 53 may respond to the induced magnetic field and apply a driving force to the voice coil 522, and the voice coil 522 is driven by the magnetic force of the magnetic circuit system 53 to displace, so as to drive the diaphragm set 521 to vibrate, so as to form a sound.

Referring to fig. 1b in combination with fig. 1c, fig. 1c is a schematic diagram illustrating the assembly of the basin stand 51, the magnetic circuit system 53 and the electrical connection of the core 502 shown in fig. 1 b. The edge of the electrical connector 523 is fixedly connected to a side surface of the frame 51 facing away from the diaphragm set 521, and a portion of the electrical connector 523 is located between the frame 51 and the side magnet 532. In this way, the electrical connector 523 may be exposed to the outer surface of the core 502, so that the electrical connector 523 is electrically connected to the circuit board of the electronic device. However, in the above-mentioned solution, the dimensions of the electrical connector 523, the side magnet 532 and the basin stand 51 are overlapped in the thickness direction of the inner core 502, so that the thickness of the inner core 502 is larger, which is not beneficial to realizing the light and thin design of the electronic device.

In order to overcome the technical bottleneck that the kernel limits electronic equipment to be further thinned, in the embodiment of the application, the electric connecting piece of the kernel is arranged between the vibrating diaphragm group and the magnetic circuit system, meanwhile, the avoiding groove for avoiding the electric connecting piece is formed in the magnetic circuit system, so that the electric connecting piece can be arranged by utilizing the original vibrating space reserved for vibration of the vibrating diaphragm group between the vibrating diaphragm group and the magnetic circuit system, thickness superposition of the electric connecting piece and other structures (such as a basin stand and the like) of the kernel is avoided, interference between the vibrating diaphragm group and the electric connection can be avoided through the first avoiding groove, the thickness of the kernel can be reduced while the acoustic performance of the kernel is ensured, the thickness of a loudspeaker module can be reduced, and the thin design of the electronic equipment is facilitated.

The application provides an electronic device which is a type of electronic device with a sound playing function. Specifically, the electronic device includes, but is not limited to, a mobile phone, a tablet computer (tablet personal computer), a laptop (laptop computer), a personal digital assistant (personal digital assistant, PDA), a personal computer, a notebook computer, a vehicle-mounted device, a wearable device, a walkman, a radio, and the like. Wherein the wearable device includes, but is not limited to, a smart bracelet, a smart watch, a smart head mounted display, smart glasses, and the like. The electronic device may be a foldable electronic device, and for the foldable electronic device, the foldable electronic device may be unfolded to an unfolded state or may be folded to a folded state under different use requirements. Of course, the electronic device may also be a non-foldable electronic device.

Referring to fig. 2, fig. 2 is a perspective view of an electronic device 100 according to some embodiments of the present application. Wherein the electronic device 100 is in an expanded state. In this embodiment, the electronic device 100 is a foldable mobile phone. Specifically, the electronic device 100 includes the folding screen 10, the supporting device 20, the circuit board 30, the battery 40, and the speaker module 50.

It is to be understood that fig. 2 only schematically illustrates some components included in the electronic device 100, and the actual shape, actual size, actual position, and actual configuration of these components are not limited by fig. 2.

The folding screen 10 can be used to display information and provide an interactive interface for a user. In embodiments of the present application, the folding screen 10 may be, but not limited to, an organic light-emitting diode (OLED) display screen, an active-matrix organic light-emitting diode (AMOLED) display screen, a mini-led (mini organic light-emitting diode) display screen, a micro-led (micro organic light-emitting diode) display screen, a micro-organic light-emitting diode (micro organic light-emitting diode) display screen, or a quantum dot led (quantum dot light emitting diodes, QLED) display screen, etc.

The folding screen 10 is switchable between an unfolded state and a folded state. The folding screen 10 is foldable into a first portion 11 and a second portion 12 when in a folded state. The folding screen 10 further comprises a third portion 13 located between the first portion 11 and the second portion 12. At least the third portion 13 of the folding screen 10 is made of a flexible material. The first portion 11 and the second portion 12 may be made of a flexible material, may be made of a rigid material, and may be made of a flexible material, and are not particularly limited herein.

With continued reference to fig. 2, when the folding electronic device 100 is in the unfolded state, the first portion 11, the second portion 12, and the third portion 13 of the folding screen 10 are disposed coplanar and facing the same direction. In this state, can realize the large-scale display, can provide richer information for the user, bring better use experience for the user.

Referring to fig. 3, fig. 3 is a schematic structural diagram of the electronic device 100 shown in fig. 2 in a folded state. When the electronic device 100 is in the folded state, the third portion 13 is in the folded state, and the first portion 11 (not shown in fig. 3) is opposite to the second portion 12 (not shown in fig. 3). In this state, the folding screen 10 is not visible to the user. The supporting device 20 is protected outside the folding screen 10 to prevent the folding screen 10 from being scratched by hard objects, and the foldable mobile phone is an inward folding mobile phone. Of course, in other examples, the foldable cellular phone may also be a fold-out cellular phone, i.e. in the folded state, the first portion 11 and the second portion 12 are opposite, with the support means 20 between the first portion 11 and the second portion 12. Therefore, in the folded state, the volume of the electronic device 100 can be reduced, and the electronic device 100 can be stored conveniently, regardless of whether the electronic device 100 is an inward folding electronic device 100 or an outward folding electronic device 100.

The support device 20 is used to support the folding screen 10 and allow the folding screen 10 to be switched between an unfolded state and a folded state. Referring to fig. 4, fig. 4 is a perspective view of the supporting device 20 in the electronic apparatus 100 shown in fig. 2-3. In the present embodiment, the supporting device 20 includes a first housing 21, a second housing 22, and a rotation mechanism 23. It will be appreciated that fig. 4 only schematically illustrates some of the components comprised by the support device 20, the actual shape, actual size, actual position and actual configuration of which are not limited by fig. 4.

The support device 20 has a support surface that can be used to support the folding screen 10. By the support of the support surface, the folding screen 10 can be made flat in the unfolded state, and the display surface of the folding screen 10 can be made flat.

The first housing 21 is for supporting and securing the first portion 11 of the folding screen 10. Specifically, the first housing 21 has a support surface M1, and the first housing 21 supports and fixes the first portion 11 of the folding screen 10 via the support surface M1. Exemplary means of attachment of the support surface M1 to the first portion 11 include, but are not limited to, gluing.

The second housing 22 is used to support and secure the second portion 12 of the folding screen 10. Specifically, the second housing 22 has a support surface M2, and the second housing 22 supports and secures the second portion 12 of the folding screen 10 by the support surface M2. Exemplary, the connection of the support surface M2 to the second portion 12 includes, but is not limited to, gluing.

The inside of the first housing 21 forms a first accommodation chamber (not shown in the drawings). The interior of the second housing 22 forms a second receiving chamber (not shown). The first and second accommodation chambers are used to accommodate electronic devices such as the circuit board 30, the battery 40, the speaker module 50, and the like of the electronic apparatus 100.

The rotation mechanism 23 is used to support the third portion 13 of the folding screen 10. The rotation mechanism 23 is connected between the first housing 21 and the second housing 22, and the first housing 21 and the second housing 22 are rotatably connected by the rotation mechanism 23, thereby realizing relative rotation between the first housing 21 and the second housing 22.

Referring to fig. 5, fig. 5 is an exploded view of the first housing 21, the circuit board 30, the speaker module 50 and the battery 40 of the electronic device 100 shown in fig. 2-3. In the present embodiment, the circuit board 30, the battery 40 and the speaker module 50 are illustrated as being located in the first housing 21, and those skilled in the art will appreciate that the circuit board 30, the battery 40 and the speaker module 50 may also be located in the second housing 22. Alternatively, the circuit board 30 and the speaker module 50 are located in the first housing 21, and the battery 40 is located in the second housing 22.

The first housing 21 has a substantially rectangular parallelepiped shape. For convenience of description of the embodiments below, an XYZ coordinate system is established. Specifically, the width direction of the first housing 21 is defined as the X-axis direction, the length direction of the first housing 21 is defined as the Y-axis direction, the thickness direction of the first housing 21 is defined as the Z-axis direction, and the X-axis, the Y-axis, and the Z-axis are perpendicular to each other. It is to be understood that the coordinate system of the first housing 21 may be flexibly set according to actual needs, which is not specifically limited herein.

Specifically, the first housing 21 includes a first middle frame 211 and a first back cover 212. The supporting surface M1 is located on the first middle frame 211. The first back cover 212 is fixed on one side of the first middle frame 211 facing away from the supporting surface M1, and a surface of the first back cover 212 facing away from the supporting surface M1 of the first middle frame 211 is an appearance surface. The first accommodating cavity on the first housing 21 is defined by the first middle frame 211 and the first back cover 212.

The circuit board 30 is used for integrating the control chip. The circuit board 30 may be fixed in the installation space by screwing, clamping, gluing or welding. In some embodiments, the circuit board 30 is electrically connected to the folding screen 10, and the circuit board 30 is used to control the folding screen 10 to display images or video. The circuit board 30 may be a hard circuit board 30, a flexible circuit board 30, or a combination of hard and soft circuit boards 30. The circuit board 30 may be an FR-4 dielectric board, a Rogers dielectric board, a mixed dielectric board of FR-4 and Rogers, or the like. Here, FR-4 is a code of a flame resistant material grade, and the Rogers dielectric board is a high frequency board.

The battery 40 is fixed in the first accommodation chamber. The battery 40 is illustratively secured below the receiving cavity by means of a snap fit, adhesive or screw connection, or the like. The battery 40 is used to supply power to the circuit board 30, the folding screen 10, the speaker module 50, and the like.

The speaker module 50 is used for reproducing audio electrical signals such as music, voice, etc. into sound, so that the electronic device 100 can support audio playback. The speaker module 50 is electrically connected to the circuit board 30. Specifically, referring to fig. 4, the speaker module 50 has an audio channel 50a. The sound signal outputted from the speaker module 50 is outputted from the sound output channel 50a. The side of the first middle frame 211 is provided with a sound outlet 21a. The sound outlet hole 21a communicates with the sound outlet passage 50a. The sound signal output from the sound output channel 50a is further output from the sound output hole 21a to the outside of the electronic device 100.

The speaker module 50 is fixed in the first accommodating chamber. With continued reference to fig. 4, the speaker module 50 and the circuit board 30 are arranged in the XY plane side by side, and a portion of the speaker module 50 and the circuit board 30 are arranged in the X-axis direction. Another portion of the speaker module 50 is arranged in the Y-axis direction with the circuit board 30.

In this embodiment, the speaker module 50 may be used as a low-frequency speaker, a mid-frequency or high-frequency speaker, or a low-frequency, mid-frequency or high-frequency speaker.

Referring to fig. 6 and 7, fig. 6 is a perspective view of the speaker module 50 in the exploded view of fig. 5, and fig. 7 is a sectional view of the speaker module 50 at line B-B of fig. 6. In this embodiment, the speaker module 50 includes a housing 501, an inner core 502, and an electrical connection structure 503.

It should be noted that fig. 6 to 7 only schematically illustrate some components included in the speaker module 50, and the actual shape, the actual size, the actual position, and the actual configuration of these components are not limited to fig. 6 to 7. In addition, the coordinate system in fig. 6 and the coordinate system in fig. 5 are represented as the same coordinate system. That is, the positional relationship of the respective components in the speaker module 50 in fig. 6 in the coordinate system shown in fig. 5 is the same as the positional relationship of the respective components in the coordinate system shown in fig. 5 when the speaker module 50 is applied to the electronic device 100 shown in fig. 5.

The housing 501 is used to support and secure the core 502, the core 502 being located within the housing 501. The housing 501, in cooperation with the core 502, may enclose a front cavity C1 and a rear cavity C2 of the speaker module 50. The sound outlet passage 50a is formed on the housing 501 and communicates with the front cavity C1.

The material of the housing 501 includes, but is not limited to, metal, plastic, or a combination of metal and plastic. In some embodiments, the material of the housing 501 is plastic, which has low cost and is easy to mold, so as to reduce the processing cost of the speaker module 50.

The housing 501 may be a unitary structure or may be assembled from multiple parts. This arrangement is advantageous in reducing the difficulty in molding and assembling the housing 501.

The housing 501 may have a via (not shown) formed therein, and one end of the electrical connection structure 503 extends into the housing 501 through the via to electrically connect with the core 502, and one end of the electrical connection structure 503 located outside the housing 501 is electrically connected with the circuit board 30.

The electrical connection structure 503 includes, but is not limited to, a flexible circuit board (flexible printed circuit, FPC), wires, enameled wires, a structure formed by connecting a plurality of wires through a flexible structure. In the embodiment shown in fig. 6-7, the electrical connection structure 503 is a flexible circuit board.

When energized, the inner core 502 may push air within the front cavity C1 to vibrate to form a sound signal, thereby converting the audio electrical signal into a sound signal that may be transmitted to the outside of the housing 501 by the sound outlet channel 50 a.

Referring to fig. 8-9, fig. 8 is a schematic structural diagram of the core 502 in the speaker module 50 shown in fig. 6, and fig. 9 is an exploded view of the core 502 shown in fig. 8. The core 502 includes a basin stand 51, a vibration system 52, and a magnetic circuit system 53.

It should be noted that fig. 8-9 only schematically illustrate some components included in the core 502, and the actual shape, actual size, actual position, and actual configuration of these components are not limited by fig. 8-9. In addition, the coordinate system in fig. 8 and the coordinate system in fig. 6 are represented as the same coordinate system. That is, the positional relationship of each component in the kernel 502 in fig. 8 in the coordinate system shown in fig. 8 is the same as the positional relationship of each component in the kernel 502 in the coordinate system shown in fig. 6 when the kernel 502 is applied to the speaker module 50 shown in fig. 6.

It will be appreciated that references hereinafter to "top" of the various components in the core 502 refer to the location of the described component closer to the front cavity when the core 502 is applied within the speaker module 50, "bottom" refers to the location of the described component farther from the front cavity when the core 502 is applied within the speaker module 50, "inner" refers to the location of the described component closer to the central axis of the core 502, and "outer" refers to the location of the described component farther from the central axis of the core 502, rather than indicating or implying that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application. In addition, the following description describes that the shape of each component in the core 502 is "rectangular" and "square" each representing a general shape, and rounded corners may or may not be provided between adjacent sides. Moreover, the positional relationship qualifiers such as "parallel", "perpendicular", "in-line", "opposite", and the like, used in the various components of the core 502, are all intended to refer to a general orientation that allows for some error. The error range may be a range in which the deviation angle is less than or equal to 5 °, 8 °, or 10 °.

The basin stand 51 serves as a "supporting skeleton" of the inner core 502 for supporting the vibration system 52 and fixing the magnetic circuit system 53. Referring to fig. 10, fig. 10 is a perspective view of a basin stand 51 in the core 502 shown in fig. 8-9. The tub 51 includes a ring-shaped frame 511. Illustratively, the frame 511 is a donut shape.

Specifically, referring to fig. 10, the frame 511 includes opposite first 5111 and second 5112 sides, and opposite third 5113 and fourth 5114 sides. The extending directions of the first and

second side portions

5111 and 5112 are parallel to the Y axis, and the extending directions of the third and

fourth side portions

5113 and 5114 are parallel to the X axis. The third and

fourth side portions

5113 and 5114 have a length longer than the first and

second side portions

5111 and 5112. The frame 511 is formed by sequentially connecting and enclosing a first side 5111, a third side 5113, a second side 5112, and a fourth side 5114. The frame 511 may be a whole structure, or may be formed by assembling a plurality of parts by bonding, clamping, screwing, or the like.

With continued reference to fig. 10, the frame 511 includes a first top surface 511a and a first bottom surface 511b disposed opposite to each other. The frame 511 further includes a first inner side surface 511c and a first outer side surface 511d disposed opposite to each other, and the first inner side surface 511c and the first outer side surface 511d are connected between the first top surface 511a and the first bottom surface 511b. The first top surface 511a, the first bottom surface 511b, the first inner side surface 511c, and the first outer side surface 511d of the frame 511 are annular surfaces provided around the circumferential direction of the frame 511.

Further, the basin stand 51 further includes a positioning protrusion 512. The positioning bump 512 is disposed on the first bottom surface 511b of the frame 511. Optionally, the positioning protrusions 512 are plural, and the plural positioning protrusions 512 are spaced apart in the circumferential direction of the frame 511. Wherein "plurality" means two or more.

For example, referring to fig. 10, the number of positioning bumps 512 is four. The two positioning protrusions 512 are disposed at intervals on the first bottom surface 511b corresponding to the third side 5113. The other two positioning protrusions 512 are disposed at intervals on the first bottom surface 511b corresponding to the fourth portion 5114. Optionally, the two positioning protrusions 512 on the third side 5113 are symmetrically disposed about the first reference plane, and the two positioning protrusions on the fourth side 5114 are symmetrically disposed about the first reference plane. The two positioning protrusions 512 on the third side 5113 and the two positioning protrusions 512 on the fourth side 5114 are symmetrically disposed with respect to the second reference plane. Wherein the first datum plane passes through the center of the inner core 502 and is parallel to the YZ plane. The second datum plane passes through the center of the kernel 502 and is parallel to the XZ plane.

With continued reference to fig. 10, the basin stand 51 further includes a support plate 513, where the support plate 513 is disposed on the first inner side 511c of the frame 511 and extends in a direction away from the first outer side 511 d. Illustratively, the first inner side surface 511c corresponding to the first edge 5111 and the first inner side surface 511c corresponding to the second edge 5112 are respectively provided with the support plate 513. That is, the support plate 513 is provided on a side surface of the first side 5111 facing the second side 5112, and the support plate 513 is also provided on a side surface of the second side 5112 facing the first side 5111. The support plate 513 may be provided at a middle portion of the first side 5111 or at an end portion of the first side 5111 in the longitudinal direction. The support plate 513 on the first side 5111 and the support plate 513 on the second side 5112 may be symmetrically disposed with respect to the first reference plane or may be symmetrically disposed with respect to the center of the tub 51.

It should be noted that, the term "middle portion of the first side portion 5111" as used herein should be understood in a broad sense, that is, a position between two ends of the first side portion 5111 in the longitudinal direction may be understood as "middle portion of the first side portion 5111".

In some examples, support plate 513, positioning tabs 512 are integrally formed with frame 511. That is, the basin stand 51 is an integrally formed member. Illustratively, the basin stand 51 is a plastic part, and the supporting plate 513, the positioning protrusions 512 and the frame 511 are integrally injection molded. The arrangement is beneficial to simplifying the processing technology of the basin stand 51 and reducing the production cost.

In other examples, the supporting plate 513, the positioning protruding block 512 and the frame 511 may be further connected by gluing, welding, clamping, etc., so that the mold structure of the supporting plate 513, the positioning protruding block 512, the frame 511 and the basin stand 51 may be simplified, and the molding difficulty may be reduced.

It will be appreciated that the basin stand 51 is used to support the vibration system 52 and fix the magnetic circuit system 53, and that the basin stand 51 may have other design shapes in order to meet the requirement, and is not limited to the present embodiment.

Referring to fig. 11, fig. 11 is an exploded view of the vibration system 52 of the core 502 of fig. 9. Vibration system 52 includes diaphragm assembly 521, voice coil 522, electrical connection 523, and electrical conductor 524.

The diaphragm set 521 is a main body for pushing air in the front cavity of the speaker module 50 to move. When the core 502 shown in fig. 8 is applied to the speaker module 50 shown in fig. 6 to 7, the core 502 separates the front cavity C1 and the rear cavity C2 of the speaker module 50 by the diaphragm group 521.

Referring to fig. 12-13, fig. 12 is a perspective view of the diaphragm set 521 in the exploded view of fig. 11, and fig. 13 is a perspective cross-sectional view of the diaphragm set 521 at line C-C of fig. 12. Diaphragm set 521 includes a dome 5211 and a diaphragm 5212.

The dome 5211 has a plate shape. Specifically, the dome 5211 has a rectangular plate shape. The length direction of the dome 5211 is parallel to the X axis, the width direction of the dome 5211 is parallel to the Y axis, and the thickness direction of the dome 5211 is parallel to the Z axis.

The diaphragm 5212 is annular. Specifically, the diaphragm 5212 has a rectangular ring shape. The long side of the diaphragm 5212 extends parallel to the X axis and the short side of the diaphragm 5212 extends parallel to the Y axis. The diaphragm 5212 includes a first fixed portion 5212a, a bellows 5212b, and a second fixed portion 5212c, which are sequentially connected. The first fixing portion 5212a is located inside the hinge 5212b, and the second fixing portion 5212c is located outside the hinge 5212 b. The first fixing portion 5212a is fixedly connected to the dome 5211, and the second fixing portion 5212c is fixedly connected to the basin stand 51. Alternatively, diaphragm 5212 is an integral piece. The diaphragm 5212 and the dome 5211 can be integrally connected by means of an adhesive or the like. Of course, in other embodiments, the diaphragm 5212 and the dome 5211 may be integrally formed.

The cross-sectional shape of the folded ring 5212b of the diaphragm 5212 is arc-shaped or approximately arc-shaped, and the extending track of the folded ring 5212b is identical to the extending track of the diaphragm 5212. The bellows 5212b of the diaphragm 5212 can deform when subjected to an external force, so that the dome 5211 can vibrate up and down in the Z-axis direction. In the present embodiment, the ring 5212b of the diaphragm 5212 is concavely disposed, i.e., the ring 5212b is concaved toward the rear cavity of the speaker module 50. In this way, the overall thickness of the core 502 is advantageously reduced, thereby advantageously reducing the thickness of the speaker module 50 and facilitating the slim design of the electronic device 100.

The voice coil 522 is used to cooperate with the magnetic circuit system 53 to drive the diaphragm set 521 to vibrate, so as to push air in the front cavity of the speaker module 50 to move to generate sound. Referring to fig. 14, fig. 14 is a perspective view of the voice coil 522 in the exploded view of fig. 11. Voice coil 522 is generally rectangular in shape. The voice coil 522 includes a first short side segment 5221, a second short side segment 5222, which are disposed opposite each other, and a first long side segment 5223 and a second long side segment 5224, which are disposed opposite each other. The extending direction of the first long side section 5223 and the second long side section 5224 coincides with the X-axis direction. The extending direction of the first short side segment 5221 and the second short side segment 5222 coincides with the Y-axis direction. The voice coil 522 is formed by sequentially joining a first short side segment 5221, a first long side segment 5223, a second short side segment 5222, and a second long side segment 5224.

Voice coil 522 is wound from a voice coil wire. The voice coil wire has superior plasticity, which means the ability to produce unrecoverable deformation, and is convenient to wind to form the voice coil 522. In some embodiments, the voice coil wire may be selected as an enameled wire.

Voice coil 522 includes two lead terminals 5225. The two lead terminals 5225 are disposed at intervals in the circumferential direction of the voice coil 522. One of the two lead terminals 5225 is a positive lead terminal, and the other is a negative lead terminal. Two lead terminals 5225 may be provided at both corner positions of the voice coil 522, respectively. In some embodiments, two lead terminals 5225 can be disposed at adjacent two corner locations of the voice coil 522, respectively. In other embodiments, two lead-out terminals 5225 may also be provided at spaced apart corner locations of the voice coil 522, respectively. That is, two lead terminals 5225 are provided at two diagonal positions of the voice coil 522, respectively.

With continued reference to fig. 14, voice coil 522 has an opposing voice coil top surface 522a and voice coil bottom surface 522b. The top surface 522a of the voice coil is fixed to the diaphragm set 521, and the end of the bottom surface 522b of the voice coil is extended into the magnetic gap K of the magnetic circuit system 53 to cooperate with the magnetic circuit system 53. It will be appreciated that in other embodiments, the voice coil 522 may be formed as a planar voice coil, and in this embodiment, the voice coil 522 is disposed opposite to the magnetic gap K of the magnetic circuit system 53, and does not need to extend into the magnetic gap K of the magnetic circuit system 53. The planar voice coil may be manufactured by winding, or by means of printed wiring. The thickness of the planar voice coil is small, which is advantageous for reducing the thickness of the inner core 502.

Referring to fig. 15, fig. 15 is an assembly schematic diagram of the voice coil 522 shown in fig. 14, the diaphragm set 521 shown in fig. 12, and the basin stand 51 shown in fig. 10. The voice coil top surface 522a of the voice coil 522 is fixedly connected to the diaphragm set 521. The connection between the voice coil 522 and the diaphragm assembly 521 includes, but is not limited to, gluing. The second fixing portion 5212c of the diaphragm assembly 521 is fixedly coupled to the first top surface 511a of the frame 51. That is, the second fixing portion 5212c of the diaphragm group 521 is fixedly coupled to the first top surface 511a of the frame 511. The connection between the diaphragm assembly 521 and the frame 51 includes, but is not limited to, gluing.

The electrical connector 523 is used for leading out the electrode of the voice coil 522 so as to realize electrical connection between the voice coil 522 and the electrical connection structure 503, and further realize electrical connection between the voice coil 522 and the circuit board 30 of the electronic device 100. To avoid the electrical connector 523 from obstructing the movement of the voice coil 522, the electrical connector 523 is of flexible construction. The flexible structure includes, but is not limited to, a flexible circuit board (FPC) and a structure formed by connecting a plurality of wires through the flexible structure. In this embodiment, the electrical connector 523 is a flexible circuit board.

Referring to fig. 11, there are two electrical connectors 523, and the two electrical connectors 523 are distributed in the circumferential direction of the voice coil 522. The two electrical connectors 523 may be connected together or may be spaced apart. The two electrical connectors 523 are electrically connected to the two lead terminals 5225 of the voice coil 522, respectively.

Referring to fig. 11, the two electrical connectors 523 have the same structure. Each electrical connector 523 includes a first end 5231, a second end 5232, and a connecting stub 5233. At least a portion of the connecting stub 5233 is connected between the first end 5231 and the second end 5232. In some embodiments, the electrical connector 523 includes a first end 5231 and a second end 5232, the first end 5231 and the second end 5232 being located at two ends of the extension direction of the connecting stub 5233, respectively, in which case the connecting stub 5233 is integrally connected between the first end 5231 and the second end 5232. In other embodiments, the electrical connector 523 includes two first ends 5231 and one second end 5232, the two first ends 5231 are respectively located at two ends of the connecting branch 5233 in the extending direction, and the first ends 5231 are connected to the middle of the connecting branch 5233.

The first end 5231 is fixed to the voice coil 522, and the second end 5232 is fixed to the bobbin 51. The first end 5231 can move relative to the second end 5232 to avoid interference of the electrical connector 523 with vibration of the voice coil 522.

Referring to fig. 16, fig. 16 is a schematic diagram illustrating an assembly of the voice coil 522, the electrical connector 523 and the basin stand 51 of fig. 10 in the vibration system 52 of fig. 11. The first end 5231 is fixed to the corner of the voice coil 522. The second end 5232 supports and is fixed to the support plate 513 of the tub 51.

In some embodiments, two electrical connections 523 are located on the same side of voice coil 522. For example, two electrical connectors 523 may be disposed between the first edge 5111 of the frame 51 and the first short side segment 5221 of the voice coil 522. That is, the two electrical connectors 523 are arranged in the extending direction of the first short side section 5221. Specifically, the two electrical connectors 523 are symmetrically disposed about the second reference plane.

The two electrical connectors 523 are fixedly connected to two corner positions of the voice coil 522 by respective first end portions 5231, and the two lead terminals 5225 of the voice coil 522 are electrically connected to the two first end portions 5231, respectively. Illustratively, two first ends 5231 are fixedly attached to two corner locations at each end of the first short side segment 5221. Alternatively, the first end 5231 and the lead-out terminal 5225 may be electrically connected by soldering, gluing, or the like. The second end 5232 can be used to electrically connect with the electrical connection 503.

In this embodiment, by disposing two electrical connectors 523 on the same side of the voice coil 522, electrical connection between the electrical connectors 523 and the electrical connection structure 503 is facilitated, and electrical connection difficulty between the inner core 502 and the electrical connection structure 503 can be reduced.

On this basis, in order to facilitate improving the structural symmetry of the inner core 502, so that the stress of the voice coil 522 is more uniform, and rolling vibration generated in the vibration process of the vibration system 52 is avoided, referring to fig. 11 and 16, the inner core 502 further includes two first balance members 525. The first balance member 525 has the same structure as the electrical connection member 523, and the two first balance members 525 and the two electrical connection members 523 are symmetrically disposed on opposite sides of the voice coil 522.

For example, referring to fig. 16, the two electrical connectors 523 and the two first balancing members 525 are symmetrical about a first reference plane. Of course, it is understood that in other embodiments, the electrical connector 523 and the first balancing member 525 may be symmetrical about the second reference plane. The first balance member 525 is not used for leading out the electrode of the voice coil 522, but is used for balancing the vibration resistance, so as to avoid the rolling vibration of the vibration system 52.

Specifically, the two first balancing members 525 are arranged along the extending direction of the second short side segment 5222, and the two first balancing members 525 are symmetrically arranged with respect to the second reference plane. The two first balancing members 525 are fixedly connected to two corner positions corresponding to the second short side segments 5222, respectively. The manner in which the first balance member 525 connects the voice coil 522, the bobbin 51, and the magnetic circuit 53 is the same as the manner in which the electrical connection member 523 connects the voice coil 522, the bobbin 51, and the magnetic circuit 53, and will not be described again.

Since the electric connector 523 and the first balance member 525 are symmetrically arranged, the resistances of the electric connector 523 and the first balance member 525 to the vibration of the voice coil 522 are equal or approximately equal, and the possibility of the rolling vibration of the vibration system 52 can be reduced.

The conductive element 524 is used to make an electrical connection between the electrical connection 523 and the electrical connection structure 503. Referring to fig. 11, the number of the conductive elements 524 is two, and the two conductive elements 524 are respectively corresponding to the two electrical connection elements 523 one by one. The two conductive members 524 are arranged at intervals in the extending direction of the first short side section 5221 of the voice coil 522, and the two conductive members 524 are symmetrically disposed with respect to the second reference plane. Optionally, the conductive element 524 is a metal element. Illustratively, the conductive element 524 is a steel sheet.

Referring to fig. 17a, fig. 17a is a schematic structural diagram of the conductive member 524 in the vibration system 52 shown in fig. 11. The conductive member 524 includes a conductive segment 5241, a first pad 5242 and a second pad 5243. The first pad 5242 is fixedly connected to one end of the conductive segment 5241, the second pad 5243 is fixedly connected to the other end of the conductive segment 5241, and the first pad 5242 and the second pad 5243 are located on the same side of the conductive segment 5241. Illustratively, the first and

second pads

5242, 5243 are located on the underside of the conductive segment 5241. The first pad 5242 is for electrical connection with the electrical connector 523, and the second pad 5243 is for electrical connection with an external circuit. The conductive segment 5241 is for making an electrical connection of the first pad 5242 to the second pad 5243. Specifically, the first pad 5242 is for electrically connecting with the second end 5232 of the electrical connector 523, and the second pad 5243 is for electrically connecting with the electrical connection 503. The second pad 5243 forms an external terminal of the core 502.

Referring to fig. 17 b-18, fig. 17b is a schematic view illustrating an assembly of the conductive member 524 of the vibration system 52 shown in fig. 11 and the basin stand 51 shown in fig. 10, and fig. 18 is another angular schematic view illustrating the assembly of fig. 17 b.

Referring to fig. 17b, two conductive members 524 are embedded in the basin stand 51. Specifically, the first bonding pad 5242 is embedded in the supporting plate 513 of the basin stand 51, and the bonding surface of the first bonding pad 5242 is exposed from the top surface of the supporting plate 513. In some embodiments, the bonding surface of the first bonding pad 5242 is flush with the top surface of the support plate 513. Like this, on the one hand can carry out insulation protection to first pad 5242 through backup pad 513, on the other hand can avoid first pad 5242 and backup pad 513 to produce thickness stack in the vibration direction of vibrating diaphragm group 521 for the structure of kernel 502 is compacter, is favorable to realizing the attenuate of kernel 502 overall thickness.

Of course, in other embodiments, the bonding surface of the first bonding pad 5242 may also be recessed toward the bottom surface of the support plate 513 relative to the top surface of the support plate 513. In this way, the first pad 5242 and the support plate 513 can also be prevented from being superimposed in thickness in the vibration direction of the diaphragm group 521.

With continued reference to fig. 17b, the conducting segment 5241 is embedded in the frame 511 of the basin stand 51, that is, the conducting segment 5241 is located inside the surface of the frame 511, and the conducting segment 5241 is not exposed. Illustratively, both conductive segments 5241 of both conductive members 524 are embedded in the first edge 5111 of the frame 511. Like this, on the one hand can carry out insulation protection to the conduction section 5241 through the frame 511, on the other hand, can make full use of the inner space of frame 511, avoid the conduction section 5241 to produce thickness stack with basin frame 51 in the vibration direction of vibrating diaphragm group 521 to can reduce the space that conduction section 5241 occupy in the XY plane, make the overall arrangement of kernel 502 more reasonable, the structure is compacter, can reduce the thickness and the whole volume of kernel 502.

Referring to fig. 17b in combination with fig. 18, the first bonding pad 5242 is embedded in the frame 511, and the bonding surface of the second bonding pad 5243 is exposed from the first bottom surface 511b of the frame 511. Specifically, the two second pads 5243 of the two conductive members 524 are exposed at two corner positions of the first edge 5111, respectively. In some embodiments, the bonding surface of the second pad 5243 is flush with the first bottom surface 511b. In this way, the second bonding pad 5243 and the basin frame 51 can be prevented from generating thickness superposition in the vibration direction of the diaphragm group 521, so that the structure of the inner core 502 is more compact, and the reduction of the whole thickness of the inner core 502 is facilitated.

In other embodiments, the bonding surface of the second pad 5243 can also be recessed toward the first top surface 511a of the tub 51 relative to the first bottom surface 511b of the tub 51. In this way, the second pad 5243 and the frame 51 can be prevented from being superimposed in thickness in the vibration direction of the diaphragm group 521 as well.

In this way, the conductive element 524 is electrically connected with the electrical connection element 523 and the electrical connection structure 503, and the basin stand 51 can perform an insulating function, so as to protect the conductive element 524 and prevent the conductive element 524 from being in contact with other conductive structures to generate a short circuit. In addition, since the conductive member 524 is embedded in the basin stand 51, the occupied space of the conductive member 524 can be saved, which is beneficial to reducing the thickness of the inner core 502 and the size of the inner core 502 in the XY plane, and further is beneficial to realizing the thin design of the electronic device 100.

In some embodiments, the conductive member 524 is integrally formed with the basin stand 51. Illustratively, the basin stand 51 is a plastic part, and the conductive member 524 and the basin stand 51 may be manufactured by a two-shot molding process. Specifically, in the process of processing, the conductive member 524 may be pre-buried in a mold, and then the basin stand 51 is injection molded on the conductive member 524 through a secondary injection molding process.

On this basis, in order to ensure that the soldering surface of the first pad 5242 and the soldering surface of the second pad 5243 are exposed while the conductive member 524 is embedded in the frame 511, referring to fig. 17a, the conductive section 5241 includes a main body section 5241a, a first transition section 5241b and a second transition section 5241c. The main body section 5241a is elongated, and the first and

second transition sections

5241b and 5241c are disposed opposite each other at both ends of the main body section 5241a in the longitudinal direction. The conductive segment 5241 is generally U-shaped.

Referring to fig. 19 to 20, fig. 19 is an assembly schematic diagram of a voice coil 522, an electrical connector 523, a conductive member 524 and a basin stand 51 of fig. 10 in the vibration system 52 of fig. 11, and fig. 20 is a cross-sectional view of the assembly schematic diagram of fig. 19 at line D-D. The second end 5232 of the electrical connector 523 is supported on the top surface of the support plate 513, that is, the second end 5232 of the electrical connector 523 is supported on a side surface of the support plate 513 facing the diaphragm set 521. The second end 5232 of the electrical connector 523 is electrically connected to the first pad 5242 of the electrical conductor 524. Optionally, the second end 5232 of the electrical connector 523 is electrically connected to the first pad 5242 by soldering, adhesive, or the like.

In this embodiment, to ensure structural symmetry of the inner core 502, balancing the vibrational resistance of the vibrational system 52, the inner core 502 further includes two second balancing members 526. Referring to fig. 11, the second balance member 526 has the same structure as the conductive member 524. The two second balance pieces 526 and the two conductive pieces 524 are symmetrically disposed with respect to the voice coil 522. Specifically, referring to fig. 17b and 19, the two second balance members 526 are symmetrical with respect to the two conductive members 524 with respect to the first reference plane. Of course, it is understood that in other embodiments, the two conductive members 524 and the two second balance members 526 may be symmetrical about the second reference plane. The second balance member 526 is not used for being electrically connected to the electrical connection structure 503, but is only used for balancing the vibration resistance, so as to avoid the rolling vibration of the vibration system 52.

Specifically, referring to fig. 19, two second balance pieces 526 are arranged along the extending direction of the second edge 5112, and the two second balance pieces 526 are symmetrically disposed with respect to the second reference plane. The two second balance pieces 526 are embedded on the second edge 5112 of the basin stand 51. The second balance member 526 is connected to the frame 51 in the same manner as the conductive member 524 is connected to the frame 51, and will not be described herein.

Since the conductive member 524 and the second balance member 526 are symmetrically disposed, the conductive member 524 and the second balance member 526 have equal or approximately equal resistance to the vibration of the voice coil 522, which reduces the possibility of rolling vibration of the vibration system 52.

The magnetic circuit system 53 is used to cooperate with the voice coil 522 to drive the diaphragm set 521 to vibrate. Referring to fig. 21, fig. 21 is a cross-sectional view of the core shown in fig. 8 at line E-E, and the magnetic circuit 53 is fixed to the tub 51. The magnetic circuit system 53 is located at one side of the diaphragm set 521, the magnetic circuit system 53 has an annular magnetic gap K, and the end of the bottom 522b of the voice coil 522 extends into the magnetic gap K, so that the magnetic circuit system 53 and the voice coil 522 cooperate to drive the diaphragm set 521 to vibrate.

With continued reference to fig. 21, in the vibration direction (i.e., the Z-axis direction) of the diaphragm set 521, a portion of the electrical connection member 523 is located between the magnetic circuit 53 and the diaphragm set 521. Specifically, the electrical connector 523 is located on the side of the magnetic gap K away from the central axis of the magnetic circuit 53. That is, a part of the electrical connector 523 is located outside the magnetic gap K. In some embodiments, at least a portion of the electrical connector 523 is opposite to the gimbal 5212b of the diaphragm set 521. Specifically, the orthographic projection of the electrical connector 523 on the reference plane (the plane perpendicular to the vibration direction of the diaphragm group 521) overlaps with the orthographic projection of the gimbal 5212b on the reference plane. In this way, the original vibration space reserved for the vibration of the diaphragm set 521 between the diaphragm set 521 and the magnetic circuit 53 can be fully utilized to provide the electrical connector 523, so that the electrical connector 523 and the basin stand 51 can be prevented from generating thickness superposition in the thickness direction of the core 502 (i.e. the vibration direction of the diaphragm set 521), thereby reducing the thickness of the core 502, further reducing the thickness of the speaker module 50, and being beneficial to the thin design of the electronic device 100.

On this basis, in order to avoid interference between the electrical connector 523 and the diaphragm set 521, as shown in fig. 21, a surface of the magnetic circuit 53 facing the diaphragm set 521 is provided with a first avoiding groove 534b recessed toward a direction away from the diaphragm set 521, and a portion of the electrical connector 523 is located in the first avoiding groove 534 b.

Referring to fig. 22 to 23, fig. 22 is an assembly schematic diagram of the magnetic circuit 53, the bobbin 51, the electrical connector 523, and the voice coil 522 in the core 502 shown in fig. 8, and fig. 23 is a cross-sectional view of the assembly schematic diagram shown in fig. 22 at line F-F. The connection knob 5233 of the electrical connector 523 includes a movable segment 5233a and a fixed segment 5233b. One end of the movable section 5233a is connected to the first end 5231, and the fixed section 5233b is connected to the movable section 5233a and the second end 5232 of the electrical connector 523, respectively. In this embodiment, the connection stub 5233 of the electrical connector 523 includes a fixed segment 5233b and a movable segment 5233a, with the fixed segment 5233b being connected between the second end 5232 and the movable segment 5233a. In some embodiments, referring to fig. 22-23, the movable segment 5233a is formed as an arcuate segment that arches away from the voice coil 522 and the fixed segment 5233b is formed as a straight segment.

In other embodiments, the electrical connector 523 may also include one fixed segment 5233b and two movable segments 5233a. In this embodiment, the electrical connector 523 may include two first ends 5231 and one second end 5232. The two movable segments 5233a are respectively and fixedly connected to two ends of the fixed segment 5233b in the length direction. One end of the two movable segments 5233a, which is far away from the fixed segment 5233b, is respectively connected to the two first end portions 5231, and the second end portion 5232 of the electrical connector 523 may be located at the middle portion of the fixed segment 5233b.

In some embodiments, the fixed segment 5233b is connected to the first bypass slot 534b and the movable segment 5233a is suspended. Referring to fig. 22-23, the magnetic circuit 53 is provided with an avoiding space 53a for avoiding the movable segment 5233a, and the movable segment 5233a faces the avoiding space 53a in the vibration direction of the diaphragm set 521. Specifically, the orthographic projection of the movable segment 5233a in the reference plane is a third projection, the orthographic projection of the avoidance space 53a in the reference plane is a fourth projection, and the third projection is located inside the outer contour of the fourth projection.

Because the movable segment 5233a near the first end 5231 has a larger vibration amplitude when vibrating along with the movement of the voice coil 522, in the embodiment of the present application, the space 53a is used for avoiding the above-mentioned space 53a is arranged on the magnetic circuit system 53, so that the movable segment 5233a is suspended, and the interference of the magnetic circuit system 53 to the vibration of the electric connector 523 can be avoided, thereby avoiding the noise generated by the electric connector 523 beating the magnetic circuit system 53, and being beneficial to improving the acoustic performance of the inner core 502. In addition, by connecting the fixed segment 5233b in the first avoidance groove 534b, the size of the suspended portion (i.e., the movable segment 5233 a) in the connection branch 5233 can be reduced, so that the size of the avoidance space 53a on the magnetic circuit system 53 can be reduced, the volume of the magnetic circuit system 53 can be increased, the magnetic field strength can be improved, and the acoustic performance of the core 502 can be improved.

In some embodiments, referring to fig. 21, fixed segment 5233b is connected to first relief groove 534b by cushioning material 55. Because the buffer material 55 has a certain deformability, when the electric connector 523 vibrates under the drive of the voice coil 522, the buffer material 55 can weaken interference generated by vibration of the electric connector 523 by utilizing self deformation, so that on one hand, on the premise of not influencing the vibration of the voice coil 522 and the electric connector 523, the electric connector 523 is further prevented from beating the magnetic circuit system 53, noise of the inner core 502 is further avoided, and the sound emitting effect of the inner core 502 is improved; on the other hand, the connection stress between the magnetic circuit system 53 and the fixed segment 5233b can be reduced, and the fatigue fracture of the electrical connection 523 can be avoided.

In some embodiments, the cushioning material 55 is connected between the fixed segment 5233b and the groove bottom wall of the first relief groove 534b. In other embodiments, cushioning material 55 may be coupled between the slot sidewall of first relief slot 534b and fixed segment 5233 b. In still other embodiments, the cushioning material 55 may be connected between the fixed segment 5233b and the groove bottom wall of the first relief groove 534b and between the groove side wall of the first relief groove 534b and the fixed segment 5233 b. The bottom wall of the first avoidance groove 534b is a wall surface of the first avoidance groove 534b facing the diaphragm group 521.

Optionally, the cushioning material 55 is an adhesive. The bonding glue may be selected from liquid glue, such as uv curable glue, wire bonding glue or white glaze glue. In other examples, cushioning material 55 may also be selected from foam, rubber, or silicone.

The following describes a specific structure of the magnetic circuit system 53 in the embodiment of the present application.

Referring to fig. 24-25, fig. 24 is a perspective view of the magnetic circuit 53 in the core 502 shown in fig. 9, and fig. 25 is an exploded view of the magnetic circuit 53 shown in fig. 24. The magnetic circuit system 53 includes a center magnet 531, side magnets 532, a center yoke 533, an edge yoke 534, and a lower yoke 535.

The central magnet 531 may be a magnet or a magnetic steel. The central magnet 531 is formed in a flat plate-like structure. Specifically, the center magnet 531 has a rectangular flat plate shape. The longitudinal direction of the center magnet 531 is parallel to the X axis, and the width direction of the center magnet 531 is parallel to the Y axis.

The side magnets 532 are disposed around the circumference of the center magnet 531. The side magnets 532 and the center magnets 531 define a magnetic gap K therebetween. The side magnets 532 may be magnets or magnetic steel. The direction of magnetization of the side magnets 532 (direction from south to north, i.e., direction from S to N) is opposite to the direction of magnetization of the center magnet 531.

For example, referring to fig. 21, the end of the central magnet 531 near the diaphragm set 521 is S-pole, the end of the central magnet 531 far from the diaphragm set 521 is N-pole, the end of the side magnet 532 near the diaphragm set 521 is N-pole, and the end of the side magnet 532 far from the diaphragm set 521 is S-pole. In this way, a magnetic circuit may be formed between the center magnet 531 and the side magnets 532. When the voice coil 522 is energized, the voice coil 522 drives the diaphragm group 521 to vibrate by a magnetic field in the magnetic gap K.

The number of the side magnets 532 may be one or more. For example, referring to fig. 25, the number of side magnets 532 is four. Specifically, the side magnets 532 include a first side magnet 5321, a second side magnet 5322, a third side magnet 5323, and a fourth side magnet 5324. The first side magnet 5321 and the second side magnet 5322 are located on opposite sides of the central magnet 531 in the longitudinal direction (i.e., the X-axis direction), respectively. The third side magnet 5323 and the fourth side magnet 5324 are located on opposite sides of the width direction (i.e., the Y-axis direction) of the center magnet 531, respectively.

Of course, in other embodiments, the first side magnet 5321 and the second side magnet 5322 may also be disposed on opposite sides of the width direction of the central magnet 531, respectively, and the third side magnet 5323 and the fourth side magnet 5324 may be disposed on opposite sides of the length direction of the central magnet 531, respectively, so long as the first side magnet 5321 and the second side magnet 5322 are ensured to be on opposite sides of the central magnet 531, and the third side magnet 5323 and the fourth side magnet 5324 are ensured to be on opposite sides of the central magnet 531.

Thus, the first side magnet 5321, the third side magnet 5323, the second side magnet 5322 and the fourth side magnet 5324 are sequentially arranged in the circumferential direction of the voice coil 522 with intervals. A first escape gap 532a may be formed between the first side magnet 5321 and the third side magnet 5323, between the third side magnet 5323 and the second side magnet 5322, between the second side magnet 5322 and the fourth side magnet 5324, and between the fourth side magnet 5324 and the first side magnet 5321.

It is understood that the configuration of the side magnets 532 is not limited thereto and that in other embodiments the side magnets 532 may be closed loop.

In some embodiments, the first side magnet 5321 and the second side magnet 5322 are disposed symmetrically with respect to the center magnet 531 and the third side magnet 5323 and the fourth side magnet 5324 are disposed symmetrically with respect to the center magnet 531. In this way, the distribution of magnetic force lines in the magnetic gap K can be more uniform, so that the stress of the diaphragm group 521 is more uniform, rolling vibration generated in the vibration process of the diaphragm group 521 is avoided, and the sound emitting effect of the inner core 502 can be improved.

Referring to fig. 26, fig. 26 is a schematic structural diagram of a first side magnet 5321 in the magnetic circuit 53 shown in fig. 25. The first side magnet 5321 includes a first surface 5321a and a second surface 5321b which are opposite in the vibration direction of the diaphragm group 521. The first side magnet 5321 further includes a second opposite inner side 5321c and a second outer side 5321d. The second inner side 5321c faces the central magnet 531 and the second outer side 5321d faces away from the central magnet 531. The second inner side 5321c and the second outer side 5321d are connected between the first surface 5321a and the second surface 5321b.

The first surface 5321a is provided with a sink 532b recessed toward the second surface 5321b. In some embodiments, the countersink 532b extends through both end surfaces of the first side magnet 5321 in the extending direction (Y-axis direction). Further, the countersink 532b also extends through the second outer surface 5321d. That is, the countersink 532b penetrates the side of the first side magnet 5321 facing away from the center magnet 531. In this way, the dimension (i.e., the thickness dimension) of the portion of the first side magnet 5321, which is close to the center magnet 531, in the Z-axis direction can be ensured to be larger, which is favorable for increasing the magnetic field strength of the magnetic circuit system 53, and the structure is simple and the processing is convenient.

It will be appreciated that in other embodiments, the countersink 532b may extend through the second inner side 5321c, rather than through the second outer side 5321d. Alternatively, in other embodiments, countersink 532b may extend through neither second inner side 5321c nor first outer side 511d. Thus, a countersink 532b may also be formed on the first surface 5321 a.

Specifically, in some embodiments, referring to fig. 26, the first side magnet 5321 includes a first side magnet portion 5321e and a second side magnet portion 5321f, and the second side magnet portion 5321f is fixedly connected to a side surface of the first side magnet portion 5321e away from the central magnet 531. The magnetizing direction of the first side magnetic portion 5321e is the same as the magnetizing direction of the second side magnetic portion 5321 f.

Referring to fig. 27, fig. 27 is an enlarged view of the area a of fig. 21. The distance between the surface of the first side magnetic portion 5321e facing the diaphragm group 521 and the reference plane S is a first distance d1, and the distance between the surface of the second side magnetic portion 5321f facing the diaphragm group 521 and the reference plane S is a second distance d2. The first distance d1 is not equal to the second distance d2. Wherein the reference plane S is perpendicular to the plane of the vibration direction of the diaphragm group 521. Thus, the sink 532b may be defined between the first side magnetic portion 5321e and the second side magnetic portion 5321 f.

For example, referring to fig. 27, the reference plane S is perpendicular to the vibration direction of the diaphragm set 521 and is located on a side of the diaphragm set 521 facing away from the magnetic circuit system 53. In this embodiment, the first distance d1 is smaller than the second distance d2. In this way, the above-mentioned sinking groove 532b may be defined between the first side magnetic portion 5321e and the second side magnetic portion 5321f, and at the same time, the size of the first side magnetic portion 5321e in the Z-axis direction may be made larger than the size of the second side magnetic portion 5321f in the Z-axis direction, which is beneficial to increasing the magnetic field strength of the magnetic circuit system 53 and improving the magnetic field driving force of the magnetic circuit system 53.

Of course, it is understood that in other embodiments, the first distance d1 may be greater than the second distance d2. In this way, the sink 532b can be defined between the first side magnetic portion 5321e and the second side magnetic portion 5321 f.

Referring to fig. 25-26, the first side magnetic portion 5321e includes a main portion 5321e1 and two extending portions 5321e2, wherein the main portion 5321e1 is elongated, and a length direction of the main portion 5321e1 is parallel to the Y-axis direction. Specifically, the two extension portions 5321e2 are fixedly connected to both ends of the main body portion 5321e1 in the longitudinal direction. The extension 5321e2 is formed in an arc-shaped structure that arches toward a direction away from the central magnet 531. The body portion 5321e1 may be disposed outside the central magnet 531, and the extension portion 5321e2 may be disposed outside a corner of the central magnet 531.

The second side magnetic portion 5321f is fixedly connected to a surface of the main body portion 5321e1 facing away from the center magnet 531. In some embodiments, the second side magnetic portion 5321f and the first side magnetic portion 5321e may be an integral piece. In other embodiments, the first side magnetic portion 5321e and the second side magnetic portion 5321f may be separate structures, in which case the second side magnetic portion 5321f and the second side magnetic portion 5321f may be fixedly connected by adhesion, clamping, screw connection, or the like.

The second side magnet 5322 has the same structure as the first side magnet 5321, and will not be described again.

The third side magnet 5323 and the fourth side magnet 5324 are elongated.

Referring back to fig. 23-24, a center yoke 533 is stacked on the surface of the center magnet 531 facing the diaphragm set 521. The side surface of the center yoke 533 facing the diaphragm group 521 constitutes a part of the side surface of the magnetic circuit system 53 facing the diaphragm group 521. Specifically, the central magnetic yoke 533 may be disposed on the central magnet 531 by means of gluing, fastening, screwing, or the like. By providing the center yoke 533 to the center magnet 531 to restrain magnetic lines of force, the magnetic current strength in the magnetic gap K can be increased, and the driving strength of the diaphragm set 521 can be improved. Of course, it will be appreciated that in other embodiments, the center yoke 533 may not be provided.

The center yoke 533 is formed in a plate-like structure. The shape of the center yoke 533 is the same as the shape of the center magnet 531. Specifically, the center yoke 533 is formed in a rectangular flat plate-like structure. The length direction of the center yoke 533 is parallel to the X-axis, and the width direction of the center yoke 533 is parallel to the Y-axis. The material of the center yoke 533 may be low carbon steel. Carbon content of low carbon steel is generally less than 0.04%, including electromagnetically pure iron, electrolytic iron and carbonyl iron. It features high saturation magnetization, low cost and high machinability.

With continued reference to fig. 23-24, an edge magnetic yoke 534 is stacked on the surface of the edge magnet 532 facing the diaphragm set 521. Specifically, the edge magnetic yoke 534 may be disposed on the surface of the edge magnet 532 facing the diaphragm set 521 by means of gluing, fastening, screwing, or the like. The rim yoke 534 is located on the outer periphery of the center yoke 533 and is spaced apart from the center yoke 533 to provide clearance for the voice coil 522 to be inserted into the magnetic gap K. In the embodiment of the present application, the magnetic force lines may be restrained by the edge magnetic yoke 534, so as to increase the magnetic current intensity in the magnetic gap K and improve the driving intensity of the diaphragm set 521. The material of the edge yoke 534 may be low carbon steel.

Referring to fig. 28, fig. 28 is a schematic diagram illustrating a structure of an edge magnetic yoke 534 of the magnetic circuit 53 shown in fig. 25. The edge yoke 534 includes a connection frame portion 5341, a first edge yoke 5342, a second edge yoke 5343, a third edge yoke 5344, and a fourth edge yoke 5345 located inside the connection frame portion 5341.

The connection frame 5341 is annular. Specifically, the connection frame portion 5341 has a rectangular ring shape. The first and

second edge yokes

5342 and 5343 are connected to two sides of the connection frame 5341 so as to face each other, and the third and fourth edge yokes 5344 and 5345 are connected to the other two sides of the connection frame 5341 so as to face each other.

Specifically, the first, second, third, and fourth edge yokes 5342, 5343, 5344, and 5345 are disposed at intervals in the circumferential direction of the connection frame portion 5341. A second escape gap 534a is formed between the first and

third edge yokes

5342 and 5344, between the first and fourth edge yokes 5342 and 5345, between the second and

third edge yokes

5343 and 5344, and between the second and fourth edge yokes 5343 and 5345, respectively. The first relief gap 532a and the second relief gap 534a facing each other in the vibration direction of the diaphragm group 521 define the relief space 53a together. Simple structure and convenient processing.

Referring to fig. 24, a first edge magnetic yoke 5342 is laminated on a side surface of the first edge magnet 5321 facing the diaphragm set 521, a second edge magnetic yoke 5343 is laminated on a side surface of the second edge magnet 5322 facing the diaphragm set 521, a third edge magnetic yoke 5344 is laminated on a side surface of the first edge magnet 5321 facing the diaphragm set 521, and a fourth edge magnetic yoke 5345 is laminated on a side surface of the fourth edge magnet 5324 facing the diaphragm set 521. A side surface of the edge yoke 534 facing the diaphragm group 521 is formed as a part of a side surface of the magnetic circuit 53 facing the diaphragm group 521.

Referring to fig. 27 in combination with fig. 28, a side surface of the edge magnetic yoke 534 facing the diaphragm set 521 is provided with the first avoiding groove 534b. Specifically, the first and

second edge yokes

5342 and 5343 are provided with the first escape grooves 534b. Referring back to fig. 23, the fixed segment 5233b of the electrical connector 523 is disposed in the first avoiding groove 534b on the first edge yoke 5342, and the fixed segment 5233b of the first balancing member 525 is disposed in the first avoiding groove 534b on the second edge yoke 5343.

In some embodiments, referring to FIGS. 27-29, FIG. 29 is a cross-sectional view of the core 502 of FIG. 8 taken along line G-G. The side surface of the edge magnetic yoke 534 facing the diaphragm group 521 is further provided with an avoidance groove 534c, and the avoidance groove 534c is used for avoiding a folded ring 5212b of the diaphragm group 521. Specifically, the first, second, third and fourth edge yokes 5342, 5343, 5344, 5345 are each provided with a recess 534c. In this way, the thickness of the inner core 502 in the Z-axis direction can be reduced while securing the vibration space of the diaphragm group 521.

With continued reference to fig. 27-29, relief groove 534c includes a groove bottom wall that faces diaphragm assembly 521. The first relief groove 534b is formed on the groove bottom wall. Specifically, the first avoidance groove 534b is recessed from the bottom wall of the groove toward a direction away from the diaphragm group 521.

On this basis, in order to prevent the first avoiding groove 534b from penetrating the surface of the edge magnetic yoke 534 facing away from the diaphragm set 521, referring to fig. 27 to 28, the first edge magnetic yoke 5342 includes a first magnetic conductive portion 5342a and a second magnetic conductive portion 5342b, where the second magnetic conductive portion 5342b is fixedly connected to the surface of the first magnetic conductive portion 5342a facing away from the diaphragm set 521, and at least part of the second magnetic conductive portion 5342b protrudes from the first magnetic conductive portion 5342a in a direction facing away from the diaphragm set 521. The first avoiding groove 534b is formed in the second magnetic conductive portion 5342 b.

In this way, the area of the surface of the first edge magnetic yoke 5342 facing away from the diaphragm set 521 can be increased, which is favorable for increasing the connection area between the first edge magnet 5321 and the first edge magnetic yoke 5342, thereby, on one hand, being favorable for increasing the area of the first edge magnet 5321 that can be covered and bonded by the first edge magnetic yoke 5342, so that the magnetic force lines of the first edge magnet 5321 can be collected in the magnetic gap K through the first edge magnetic yoke 5342, and further, the magnetic field driving force of the magnetic circuit system 53 can be effectively increased, and the acoustic performance of the inner core 502 is improved; on the other hand, the fixing area between the first side magnet 5321 and the first edge magnetic yoke 5342 is advantageously increased, and thus the fixing area between the first side magnet 5321 and the first edge magnetic yoke 5342 can be increased, and the connection strength between the first side magnet 5321 and the first edge magnetic yoke 5342 can be increased, thereby advantageously increasing the overall structural strength of the inner core 502 and increasing the impact resistance of the inner core 502.

In some embodiments, the first edge magnetic yoke 5342 is an integral piece. That is, the first magnetic conductive portion 5342a and the second magnetic conductive portion 5342b are integrally formed. It is understood that in other embodiments, the first magnetic conductive portion 5342a and the second magnetic conductive portion 5342b may be separate pieces, in which case the first magnetic conductive portion 5342a and the second magnetic conductive portion 5342b may be connected together by adhesion, welding, clamping, screw connection, or the like.

Referring to fig. 27, the countersunk slot 532b on the first side magnet 5321 is configured to avoid the second magnetic conductive portion 5342b of the first side magnetic conductive yoke 5342. Specifically, the second magnetically conductive portion 5342b is stacked on a wall surface of the countersink 532b facing the diaphragm group 521, and the first magnetically conductive portion 5342a is stacked on the first surface 5321a of the first side magnet 5321. In this way, the surface of the first edge magnet yoke 5342 facing away from the diaphragm assembly 521 is adapted to the surface of the first edge magnet 5321 facing toward the diaphragm assembly 521, so that the surface of the first edge magnet yoke 5342 facing away from the diaphragm assembly 521 is in contact with the surface of the first edge magnet 5321 facing toward the diaphragm assembly 521.

In some embodiments, the first magnetically permeable portion 5342a is disposed in a stacked configuration with the first side magnetic portion 5321e of the first side magnet 5321, and the second magnetically permeable portion 5342b is disposed in a stacked configuration with the second side magnetic portion 5321f of the first side magnet 5321. The shape of the first magnetic conductive portion 5342a is the same as the shape of the first side magnetic portion 5321 e.

In some embodiments, the area of the side surface of the first magnetic portion 5321e facing the diaphragm set 521 is a first area, the area of the side surface of the first magnetic portion 5342a facing away from the diaphragm set 521 is a second area, and the first area is smaller than or equal to the second area. Thus, the first side magnetic portions 5321e can be bonded to the first magnetic conductive portions 5342a on the side facing the diaphragm set 521.

Similarly, the shape of the second magnetic conductive portion 5342b is the same as that of the second side magnetic portion 5321f, and the area of the surface of the second side magnetic portion 5321f facing the diaphragm set 521 is a third area, the area of the surface of the second magnetic conductive portion 5342b facing away from the diaphragm set 521 is a fourth area, and the third area is smaller than or equal to the fourth area. Thus, the second side magnetic portions 5321f can be bonded to the second magnetic conductive portions 5342b on the side facing the diaphragm set 521.

Referring to fig. 30, fig. 30 is a schematic assembly view of the edge yoke 534 shown in fig. 28 and the basin stand 51 shown in fig. 10. The connection frame portion 5341 of the edge yoke 534 is fitted to the frame 511 of the basin frame 51. In some examples, basin stand 51 is connected as one piece with edge yoke 534. For example, the frame 51 is made of plastic, the edge yoke 534 may be pre-embedded in a mold, and the frame 51 is integrally injection-molded on the edge yoke 534 through a secondary injection molding process, so that the frame 51 and the edge yoke 534 are integrally connected.

Of course, it is understood that in other embodiments, the basin stand 51 and the rim yoke 534 may be attached by gluing, clamping, or screwing. In other embodiments, edge yoke 534 may not include connecting frame portion 5341. In this case, the first, second, third, and fourth edge yokes 5342, 5343, 5344, and 5345 are fixedly connected to the tub 51, respectively.

Referring to fig. 23 in combination with fig. 25, a lower yoke 535 is provided on the surface of the center magnet 531 facing away from the diaphragm group 521 and the surface of the side magnet 532 facing away from the diaphragm group 521, and is laminated with the center magnet 531 and the side magnet 532. In this way, the lower magnetic yoke 535 can close the end of the magnetic gap K away from the diaphragm set 521, and the magnetic force lines can be restrained by the lower magnetic yoke 535, so as to increase the magnetic current strength and improve the driving strength of the diaphragm set 521.

Referring to fig. 25, the lower yoke 535 is flat. Specifically, the lower magnetically permeable yoke 535 is generally rectangular plate-shaped. The outer peripheral edge of the lower yoke 535 has a locating notch 535a. The plurality of positioning notches 535a is provided. The positioning notches 535a are used for matching with the positioning protrusions 512 on the basin stand 51 in a one-to-one correspondence. In an actual assembly process, the edge yoke 534 and the tub 51 are fixed together to form a part a, and the center magnet 531, the side magnet 532, the center yoke 533, and the lower yoke 535 may be assembled together to form a part B, and then the part B is fixed with the part a. In this process, the positioning notch 535a and the positioning protrusion 512 cooperate to perform a positioning function, so that the assembly efficiency of the core 502 can be improved.

The material of the lower yoke 535 may be the same as that of the central yoke 533, and will not be described here.

In other embodiments, referring to fig. 31-32, fig. 31 is a cross-sectional view of an inner core 502 according to other embodiments of the present disclosure, and fig. 32 is a schematic diagram illustrating an assembly of a magnetic system and a conductive element 524 in the inner core 502 shown in fig. 31. The kernel 502 in this embodiment is different from the kernel 502 in the embodiment shown in fig. 8 in that: the two lead-out terminals 5225 of the voice coil 522 in this embodiment are located at the two corners on the diagonal of the voice coil 522, respectively. The two electrical connections 523 are symmetrically disposed with respect to the center of the voice coil 522. That is, one of the electrical connectors 523 may be rotated 180 ° in a clockwise or counterclockwise direction with the center point of the voice coil 522 as an origin, and may coincide with the other electrical connector 523. The two electrical connectors 523 may be located on both sides of the voice coil 522 in the longitudinal direction (i.e., the X-axis direction) or on both sides of the voice coil 522 in the width direction (i.e., the Y-axis direction).

In this way, the two electrical connectors 523 are symmetrically arranged relative to the center of the voice coil 522, so that the stress of the voice coil 522 can be balanced well, and the pulling forces of the two electrical connectors 523 on the voice coil 522 can be mutually offset in the vibration process of the voice coil 522, so that the phenomena of polarization of the voice coil 522, fatigue fracture of the electrical connectors 523 and the like can be improved, and the acoustic performance of the inner core 502 can be improved.

Referring to fig. 31-32, the electrical connector 523 in the present embodiment is a conductive wire. The leads are integrally connected to lead terminals of the voice coil 522. That is, the wire may be co-linear with the voice coil wire. Thus, the structure of voice coil 522 can be simplified, and the overall cost of core 502 can be reduced.

With continued reference to fig. 31-32, the kernel 502 in this embodiment also differs from the kernel 502 in the embodiment shown in fig. 8 in that: the two conductive members 524 in this embodiment are symmetrically disposed on opposite sides of the voice coil 522. The two conductive members 524 may be symmetrically disposed about the first reference plane. Of course, in other embodiments, the two conductive members 524 may be symmetrically disposed about the center of the voice coil 522.

Specifically, the conductive member 524 in this embodiment includes one first pad 5242 and two second pads 5243. The conductive member 524 in the embodiment shown in fig. 8 includes a first pad 5242 and a second pad 5243. In this embodiment, two second pads 5243 are located on opposite sides of the first pad 5242, respectively, and each second pad 5243 is connected to the first pad 5242 by a conductive segment. In this way, each conductive element 524 includes two second bonding pads 5243 for connecting with the electrical connection structure 503, so that the connection between the conductive element 524 and the electrical connection structure 503 is more flexible, which is beneficial to reducing the assembly difficulty of the core 502.

Of course, it is understood that in other embodiments, the structure of the conductive member 524 may be identical to the structure of the conductive member 524 shown in fig. 8.

The structures of the frame 51, the magnetic circuit 53, and the diaphragm set 521 of the inner core 502 in this embodiment are the same as the structures of the frame 51, the magnetic circuit 53, and the diaphragm set 521 of the inner core 502 in the embodiment shown in fig. 8, and will not be described here again.

Referring to fig. 33, fig. 33 is a schematic diagram illustrating an assembly of a magnetic system and a conductive element 524 in a core 502 according to further embodiments of the present application. The core 502 in this embodiment is different from the core 502 shown in fig. 31-32 in that, in the core 502 shown in fig. 32, the second end 5232 of the electrical connector 523 is located in the middle of the first short side section 5221 of the voice coil 522, and in the core 502 of this embodiment, the first end 5231 and the second end 5232 of one of the electrical connectors 523 are located at two ends of the voice coil 522 in the length direction of the first short side section 5221, respectively. The first end portion 5231 and the second end portion 5232 of the other electrical connector 523 are located at both ends of the second short side segment 5222 of the voice coil 522 in the longitudinal direction, respectively. Thus, the length of the electrical connector 523 can be prolonged, which is beneficial to improving the fatigue resistance of the electrical connector 523 and avoiding the electrical connector 523 from breaking.

With continued reference to fig. 33, the kernel 502 in this embodiment also differs from the kernel 502 in the embodiment shown in fig. 32 in that: the two conductive members 524 in this embodiment are symmetrical about the center of the voice coil 522. Specifically, the two first pads 5242 of the two conductive members 524 are disposed opposite to each other in the extending direction of the diagonal of the voice coil 522, and the two second pads 5243 of the two conductive members 524 are disposed opposite to each other in the extending direction of the other diagonal of the voice coil 522.

In the description of the present specification, a particular feature, structure, material, or characteristic may be combined in any suitable manner in one or more embodiments or examples.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.

Claims

1. A core for a speaker module, comprising:

a diaphragm group;

the voice coil is fixedly connected to the vibrating diaphragm group;

the magnetic circuit system is positioned at one side of the vibrating diaphragm group and is used for being matched with the voice coil to drive the vibrating diaphragm group to vibrate, the magnetic circuit system is provided with a magnetic gap, a first avoidance groove is formed in the surface of one side of the magnetic circuit system, facing the vibrating diaphragm group, and the first avoidance groove is positioned at one side of the magnetic gap, far away from the central axis of the magnetic circuit system;

the electric connecting piece is electrically connected with the voice coil, is positioned between the vibrating diaphragm group and the magnetic circuit system in the vibrating direction of the vibrating diaphragm group, and a part of the electric connecting piece is positioned in the first avoidance groove.

2. The core of claim 1, wherein the magnetic circuit system comprises:

a center magnet;

the side magnets are arranged around the periphery of the central magnet, the magnetizing direction of the side magnets is opposite to that of the central magnet, and the magnetic gap is formed between the side magnets and the central magnet;

The edge magnetic yoke is arranged on the surface, facing the vibrating diaphragm group, of the edge magnet in a stacked mode, and the surface, facing away from the edge magnet, of the edge magnetic yoke is provided with the first avoidance groove.

3. The inner core of claim 2, wherein a surface of the edge magnetic yoke facing away from the diaphragm assembly is adapted to a surface of the edge magnet facing toward the diaphragm assembly.

4. A core according to claim 2 or claim 3, wherein the edge yoke is provided with a recess for accommodating the diaphragm assembly, the recess comprising a recess bottom wall opposite the diaphragm assembly, and the first accommodating recess being formed in the recess bottom wall.

5. The core according to any one of claims 2 to 4, wherein the edge magnetic yoke includes a first magnetic conductive portion and a second magnetic conductive portion, the second magnetic conductive portion is connected to the first magnetic conductive portion, and at least a portion of the second magnetic conductive portion protrudes toward a direction away from the diaphragm group with respect to the first magnetic conductive portion, the first avoiding groove is formed on the second magnetic conductive portion,

the surface of the side magnet facing the vibrating diaphragm group is provided with a sinking groove, and the second magnetic conduction part is arranged on the bottom wall of the sinking groove in a lamination mode.

6. The core of claim 5, wherein the side magnet comprises a first side magnet portion and a second side magnet portion, the second side magnet portion is fixedly connected to a surface of the first side magnet portion, which is far away from the center magnet, and a magnetization direction of the first side magnet portion is the same as a magnetization direction of the second side magnet portion;

the distance between the surface of the first side magnetic part facing the vibrating diaphragm group and the reference plane is a first distance, the distance between the surface of the second side magnetic part facing the vibrating diaphragm group and the reference plane is a second distance, and the first distance is unequal to the second distance so as to define the sink between the first side magnetic part and the second side magnetic part, wherein the reference plane is perpendicular to the vibrating direction of the vibrating diaphragm group;

the first magnetic conduction part is arranged on the first side magnetic part in a lamination mode, and the second magnetic conduction part is arranged on the second side magnetic part in a lamination mode.

7. The core of claim 6, wherein the reference plane is located on a side of the diaphragm assembly facing away from the magnetic circuit, and the first distance is less than the second distance.

8. The core of any of claims 2-7, wherein the electrical connector comprises a first end portion and a connecting stub, the first end portion being connected to the voice coil, the connecting stub comprising a fixed section and a movable section, one end of the movable section being connected to the first end portion, the other end of the movable section being connected to the fixed section, the fixed section being connected to the first relief groove, the movable section being suspended.

9. The core according to claim 8, wherein the magnetic circuit is provided with an avoidance space for avoiding the movable section.

10. The core of claim 9, wherein a first avoidance gap is provided on the side magnet, a second avoidance gap corresponding to the first avoidance gap is provided on the edge magnetic yoke, and the first avoidance gap and the second avoidance gap together define the avoidance space.

11. The core according to any of claims 2-9, further comprising:

the basin frame is in an annular frame shape, and the magnetic circuit system is fixed on the basin frame;

the electric conduction piece is fixed in the basin frame, the electric conduction piece includes first bonding pad, second bonding pad and electrically conductive section, electrically conductive section connects first bonding pad with between the second bonding pad, first bonding pad be used for with the electric connection piece electricity is connected, the second bonding pad be used for being connected with external circuit electricity.

12. The core of claim 11, wherein the electrical connection comprises a first end, a connection stub, and a second end, at least a portion of the connection stub being connected between the first end and the second end, the first end being electrically connected to the voice coil, and the second end being electrically connected to the first bond pad.

13. The core of claim 11 or 12, wherein the conductive member is embedded in the frame with the bonding surface of the first bonding pad exposed and the bonding surface of the second bonding pad exposed.

14. The core of any of claims 11-13, wherein the conductive element is of unitary construction with the basin stand.

15. The core of any of claims 11-14, wherein the basin frame comprises a first outer surface and a first inner surface opposite to each other, the first inner surface facing a central axis of the magnetic circuit system, a support plate is provided on the first inner surface, one end of the support plate is fixedly connected to the first inner surface, the other end of the support plate extends toward the direction facing away from the first outer surface, and the first bonding pad of the conductive member is embedded in the support plate.

16. The core of any of claims 11-15, wherein the rim yoke is of unitary construction with the basin stand.

17. The core of any of claims 1-16, wherein the electrical connector is connected to the first relief groove by a cushioning material.

18. The core of claim 17, wherein the cushioning material is an adhesive.

19. A loudspeaker module, characterized by comprising a shell and the inner core of any one of claims 1-18, wherein the inner core is arranged in the shell, the shell is divided into a front cavity and a rear cavity by the vibrating diaphragm group, the voice coil and the magnetic circuit system are both positioned in the rear cavity, the shell is provided with a sound outlet channel, and the front cavity is communicated with the sound outlet channel.

20. An electronic device, comprising a housing, a circuit board, and the speaker module of claim 19, wherein the circuit board and the speaker module are disposed in the housing, the speaker module is electrically connected to the circuit board, a sound outlet is disposed on the housing, and the sound outlet is communicated with the sound outlet.