CN114554368B

CN114554368B - Sound producing device and electronic equipment

Info

Publication number: CN114554368B
Application number: CN202111680967.5A
Authority: CN
Inventors: 蔡晓东; 刘松
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2021-04-01
Filing date: 2021-12-30
Publication date: 2024-02-09
Anticipated expiration: 2041-12-30
Also published as: WO2022206048A1; CN216775010U; CN114554369B; CN114554367A; CN114554367B; CN114554369A; CN113099365A; CN114554368A

Abstract

The invention discloses a sound generating device and electronic equipment, wherein the sound generating device comprises a shell, a first vibration system, a second vibration system and a magnetic circuit system, and the first vibration system comprises a first vibrating diaphragm and a first voice coil. The second vibration system includes a second diaphragm and a second voice coil. The magnetic circuit system includes a first center magnet, a second center magnet, a first yoke plate, and a second yoke plate. The circumference side of the first center magnet forms a first magnetic gap for the first voice coil to extend in, one side of the first center magnet, which is away from the first vibrating diaphragm, is connected to the second yoke plate, the circumference side of the second center magnet forms a second magnetic gap for the second voice coil to extend in, and one side of the second center magnet, which is away from the second vibrating diaphragm, is connected to the first yoke plate. The first central magnet and the second central magnet are tiled between a first yoke plate and a second yoke plate, and at least one of the first yoke plate and the second yoke plate is connected with the shell. The technical scheme of the invention can realize double-sided sounding and reduce the thickness of the sounding device.

Description

Sound producing device and electronic equipment

The present invention claims priority from chinese patent application No. 202110358638.2 entitled "sound emitting device and electronic device" filed on 1, 4/2021, the entire contents of which are incorporated herein by reference.

Technical Field

The present invention relates to the field of acoustic energy conversion technologies, and in particular, to a sound generating apparatus and an electronic device.

Background

In the current double-sided sound emitting device, a supporting plate is generally used to support the central magnetic circuit assembly, that is, a central magnet is respectively arranged at two opposite sides of the supporting plate, a magnetic gap is formed at the periphery of each central magnet, and voice coils at two sides respectively extend into the two magnetic gaps. However, when the two-sided sound generating device is configured in this way, in order to ensure that the depth of each magnetic gap can meet the working requirement of the corresponding voice coil, the thickness of each central magnet needs to be larger, namely, in the two-sided sound generating device, the thickness of one central magnet is increased, so that the thickness of the two-sided sound generating device is increased, which is very unfavorable for miniaturization of the product.

Disclosure of Invention

The invention mainly aims to provide a sound generating device, which aims to realize double-sided sound generation and reduce the thickness of the sound generating device.

In order to achieve the above object, the present invention provides a sound generating apparatus, comprising:

a housing;

the first vibration system comprises a first vibrating diaphragm and a first voice coil arranged on the first vibrating diaphragm;

the second vibration system comprises a second vibrating diaphragm and a second voice coil arranged on the second vibrating diaphragm; the method comprises the steps of,

The magnetic circuit system comprises a first central magnet, a second central magnet, a first yoke plate and a second yoke plate, wherein the first yoke plate and the second yoke plate are provided with magnetic permeability, and the first yoke plate and the second yoke plate are arranged between the first vibrating diaphragm and the second vibrating diaphragm in parallel; wherein,

a first magnetic gap for the first voice coil to extend in is formed on the peripheral side of the first central magnet, a first through hole is formed in the position, corresponding to the first magnetic gap, of the first yoke plate, one side, deviating from the first vibrating diaphragm, of the first central magnet is connected with the second yoke plate, a second magnetic gap for the second voice coil to extend in is formed on the peripheral side of the second central magnet, a second through hole is formed in the position, corresponding to the second magnetic gap, of the second yoke plate, and one side, deviating from the second vibrating diaphragm, of the second central magnet is connected with the first yoke plate;

the first central magnet and the second central magnet are in a flat-laying arrangement between the first yoke plate and the second yoke plate, and at least one of the first yoke plate and the second yoke plate is connected with the shell.

Optionally, the magnetic circuit system includes two first central magnets and two second central magnets, the two first central magnets and the two second central magnets are alternately arranged in turn along the circumferential direction of the first diaphragm, the circumferential side of each first central magnet forms a first magnetic gap, the circumferential side of each second central magnet forms a second magnetic gap, the first vibration system is provided with a first voice coil corresponding to each first magnetic gap, and the second vibration system is provided with a second voice coil corresponding to each second magnetic gap;

The magnetic circuit system further comprises a fourth central magnet, wherein the fourth central magnet is positioned between the two first central magnets and between the two second central magnets, a part of the first magnetic gap is formed between the first central magnet and the fourth central magnet, and a part of the second magnetic gap is formed between the second central magnet and the fourth central magnet.

Optionally, the first yoke plate includes a first supporting portion and a first connecting portion connected to the first supporting portion, the first connecting portion is connected to the housing, the first supporting portion extends along an arrangement direction of the two second center magnets, and the two second center magnets are connected to the first supporting portion;

the second yoke plate comprises a second supporting part, the second supporting part extends along the arrangement direction of the two first central magnets, and the two first central magnets are connected with the second supporting part;

the two first voice coils extend into the first magnetic gap from two opposite sides of the width direction of the first supporting part, and the two second voice coils extend into the second magnetic gap from two opposite sides of the width direction of the second supporting part.

Optionally, the first connecting portion is annular, one end of the first supporting portion is connected to one side of the first connecting portion, the other end of the first supporting portion is connected to the other side of the first connecting portion, and two opposite sides of the first supporting portion in the width direction are spaced from the first connecting portion so as to allow the first voice coil to pass through; and/or the number of the groups of groups,

the second supporting part further comprises a second connecting part, the second connecting part is annular and connected with the shell, one end of the second supporting part is connected with one side of the second connecting part, the other end of the second supporting part is connected with the other side of the second connecting part, and two opposite sides of the second supporting part in the width direction are spaced from the second connecting part so as to enable the second voice coil to pass through.

Optionally, the magnetic circuit system further includes two first side magnets, wherein any one of the first side magnets is disposed at intervals on one side of the first center magnet facing away from the other first center magnet and is connected with the second supporting portion, and the first yoke plate further includes a first side magnetic conductive plate connected to the inner side of the first connecting portion and connected to one side of the first side magnet facing away from the second supporting portion; and/or the number of the groups of groups,

The magnetic circuit system further comprises two second side magnets, any one of the second side magnets is arranged on one side, away from the other second center magnet, of the second center magnet at intervals and is connected with the first supporting portion, the second yoke plate further comprises a second side magnetic conduction plate, and the second side magnetic conduction plate is connected to the inner side of the second connecting portion and is connected to one side, away from the first supporting portion, of the second side magnet.

Optionally, the first vibrating diaphragm is a conductive vibrating diaphragm, and a first conductive layer is arranged on the first vibrating diaphragm and electrically connected with the first voice coil and a first bonding pad on the shell; and/or the second vibrating diaphragm is a conductive vibrating diaphragm, and a second conductive layer is arranged on the second vibrating diaphragm and electrically connected with the second voice coil and a second bonding pad on the shell.

Optionally, the first vibrating diaphragm includes a first ring-folded portion extending along a first annular axis, the first conductive layer includes a first conductive segment disposed on the first ring-folded portion, the first conductive segment is disposed in an arc perpendicular to the first annular axis, or the first conductive segment is disposed in a continuous bending manner, or the first conductive segment is disposed in an arc not perpendicular to the first annular axis; and/or the number of the groups of groups,

The second vibrating diaphragm comprises a second ring-folded part extending along a second annular axis, the second conductive layer comprises a second conductive section arranged on the second ring-folded part, the second conductive section is arranged in an arc shape perpendicular to the second annular axis, or the second conductive section is arranged in a continuous bending manner, or the second conductive section is arranged in an arc shape not perpendicular to the second annular axis.

Optionally, the first conductive layer is printed or sprayed on the first diaphragm; and/or the second conductive layer is printed or sprayed on the second vibrating diaphragm.

Optionally, the first conductive layer includes a first conductive circuit, and two first conductive connection portions separately provided at two ends of the first conductive circuit, where the two first conductive connection portions are electrically connected to the first voice coil and the first bonding pad, and the first diaphragm is further provided with a first insulating layer covering the first conductive circuit; and/or, the second conductive layer comprises a second conductive circuit and two second conductive connection parts which are respectively arranged at two ends of the second conductive circuit, the two second conductive connection parts are respectively and electrically connected with the second voice coil and the second bonding pad, and a second insulating layer which covers the second conductive circuit is further arranged on the second vibrating diaphragm.

Optionally, the first pad and/or the second pad are injection-molded and fixed to the housing.

Optionally, the material of the first conductive layer comprises any one or more of epoxy resin, polyester material and organic silicon mixed with conductive particles; and/or the material of the second conductive layer comprises any one or more of epoxy resin, polyester material and organic silicon mixed with conductive particles.

Optionally, the first vibration system further includes a first centering support, where the first centering support includes a first annular connection portion and two third support portions, the first annular connection portion is connected to the housing, and each third support portion is connected to one of the first voice coils; and/or, the second vibration system further comprises a second centering support piece, the second centering support piece comprises a second annular connecting part and two fourth supporting parts, the second annular connecting part is connected with the shell, and each fourth supporting part is connected with one second voice coil.

The invention also provides electronic equipment, which comprises the sounding device; and

the shell is provided with a mounting cavity and two sound outlet parts, the mounting cavity is separated into two sound outlet cavities by the sound generating device, a first vibrating diaphragm of the sound generating device is communicated with one sound outlet part through one sound outlet cavity, and a second vibrating diaphragm of the sound generating device is communicated with the other sound outlet part through the other sound outlet cavity;

The electronic equipment is provided with an external playing mode and an earphone mode, in the external playing mode, the first vibration system and the second vibration system of the sound generating device radiate sound waves with the same phase outwards through the corresponding sound outlet parts, and in the earphone mode, the first vibration system and the second vibration system radiate sound waves with opposite phases outwards through the corresponding sound outlet parts.

In the technical scheme of the invention, the magnetic circuit system comprises a first central magnet, a second central magnet, a first yoke plate and a second yoke plate, wherein the first yoke plate and the second yoke plate are arranged between the first vibrating diaphragm and the second vibrating diaphragm in parallel, a first magnetic gap for the first voice coil to stretch in is formed on the periphery side of the first central magnet, one side of the first central magnet, which is away from the first vibrating diaphragm, is connected with the second yoke plate, a second magnetic gap for the second voice coil to stretch in is formed on the periphery side of the second central magnet, and one side of the second central magnet, which is away from the second vibrating diaphragm, is connected with the first yoke plate. By connecting at least one of the first yoke plate and the second yoke plate with the housing, the first center magnet and the second center magnet can be fixed in the housing. And through making first central magnet and second central magnet be tiling setting between first yoke plate and second yoke plate, avoided first central magnet and second central magnet range upon range of condition that sets up, also avoided first voice coil loudspeaker voice coil and second voice coil loudspeaker voice coil to share the condition of magnetic gap at the direction of arranging of first vibrating diaphragm and second vibrating diaphragm. Compared with the mode that the first central magnet and the second central magnet are arranged in a stacked mode, the double-sided sounding is achieved, meanwhile the thickness of the magnetic circuit system can be reduced, and the thickness of the sounding device can be reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is an exploded view of one embodiment of a sound emitting device of the present invention;

FIG. 2 is an exploded view of a portion of the magnetic circuit system of FIG. 1;

FIG. 3 is a schematic cross-sectional view of the sound emitting device of FIG. 1 after assembly;

FIG. 4 is an enlarged view of FIG. 3 at A;

FIG. 5 is a schematic structural view of the first centering strut of FIG. 1;

FIG. 6 is a schematic structural view of the second centering support of FIG. 1;

FIG. 7 is an exploded view of the housing of FIG. 1;

FIG. 8 is a schematic diagram of another embodiment of a sound generating apparatus according to the present invention;

FIG. 9 is an exploded view of the magnetic circuit system of FIG. 8;

FIG. 10 is a schematic structural view of the first centering strut of FIG. 8;

FIG. 11 is a schematic structural view of the second centering strut of FIG. 8;

FIG. 12 is a schematic diagram illustrating a first diaphragm of a sound generating apparatus according to an embodiment of the present invention;

FIG. 13 is a schematic partial cross-sectional view of the first diaphragm of FIG. 12;

FIG. 14 is a schematic diagram illustrating an embodiment of a first conductive layer on the first diaphragm of FIG. 12;

FIG. 15 is a schematic diagram illustrating a structure of another embodiment of the first conductive layer on the first diaphragm of FIG. 12;

FIG. 16 is a schematic diagram illustrating a structure of a first conductive layer on the first diaphragm of FIG. 12;

FIG. 17 is a schematic view of another embodiment of a housing of a sound emitting device according to the present invention;

FIG. 18 is an exploded view of the housing of FIG. 17;

FIG. 19 is a schematic diagram of an electronic device according to an embodiment of the invention;

fig. 20 is an enlarged view at B in fig. 19.

Reference numerals illustrate:

the achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that, if a directional indication (such as up, down, left, right, front, and rear … …) is involved in the embodiment of the present invention, the directional indication is merely used to explain the relative positional relationship, movement condition, etc. between the components in a specific posture, and if the specific posture is changed, the directional indication is correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a 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 at least one such feature. In addition, the meaning of "and/or" as it appears throughout is meant to include three side-by-side schemes, for example, "a and/or B", including a scheme, or B scheme, or a scheme that is satisfied by both a and B. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

The invention provides a sound generating device which is used for electronic equipment, wherein the electronic equipment can be a notebook computer or a tablet computer and the like.

In the embodiment of the present invention, referring to fig. 1 to 4, the sound generating device includes a housing 10, a first vibration system 30, a second vibration system 40, and a magnetic circuit system 20, where the first vibration system 30 includes a first diaphragm 31 and a first voice coil 32 disposed on the first diaphragm 31. The second vibration system 40 includes a second diaphragm 41 and a second voice coil 42 provided to the second diaphragm 41. The magnetic circuit system 20 includes a first center magnet 204, a second center magnet 205, a first yoke plate 21 and a second yoke plate 22 having magnetic permeability, the first yoke plate 21 and the second yoke plate 22 being disposed in parallel between the first diaphragm 31 and the second diaphragm 41.

That is, the first yoke plate 21 and the second yoke plate 22 each have magnetic permeability, the circumferential side of the first center magnet 204 forms a first magnetic gap 201 into which the first voice coil 32 extends, and one side of the first center magnet 204 facing away from the first diaphragm 31 is connected to the second yoke plate 22, the circumferential side of the second center magnet 205 forms a second magnetic gap 202 into which the second voice coil 42 extends, and one side of the second center magnet 205 facing away from the second diaphragm 41 is connected to the first yoke plate 21. The first and second center magnets 204 and 205 are laid flat between the first and second yoke plates 21 and 22, and at least one of the first and second yoke plates 21 and 22 is connected to the housing 10.

In this embodiment, the magnetic circuit 20 is disposed between the first diaphragm 31 and the second diaphragm 41, the first yoke plate 21 faces the first diaphragm 31, the first voice coil 32 passes through the first yoke plate 21 to extend into the first magnetic gap 201, the second yoke plate 22 faces the second diaphragm 41, and the second voice coil 42 passes through the second yoke plate 22 to extend into the second magnetic gap 202. The first central magnet 204 and the second central magnet 205 are laid flat between the first yoke plate 21 and the second yoke plate 22, which means that the first central magnet 204 and the second central magnet 205 are non-stacked in the arrangement direction of the first yoke plate 21 and the second yoke plate 22. That is, a projection plane is defined, which is perpendicular to the first yoke plate 21 and the second yoke plate 22, and the orthographic projections of the first center magnet 204 and the second center magnet 205 on the projection plane are at least partially overlapped when the arrangement direction of the first center magnet 204 and the second center magnet 205 is taken as the projection direction. For example, the first center magnet 204 and the second center magnet 205 may be arranged at intervals in a direction perpendicular to the arrangement direction of the first diaphragm 31 and the second diaphragm 41. Or one of the first center magnet 204 and the second center magnet 205 is annular and is disposed around the outer periphery of the other. The first yoke plate 21 and the second yoke plate 22 are mainly used for fixing the magnetic circuit system 20.

The first yoke plate 21 is provided with a first through hole 211 at a position corresponding to the first magnetic gap 201, the first voice coil 32 penetrates through the first through hole 211 to extend into the first magnetic gap 201, the second yoke plate 22 is provided with a second through hole 221 at a position corresponding to the first magnetic gap 201, and the second voice coil 42 penetrates through the second through hole 221 to extend into the second magnetic gap 202. That is, the size of the first through hole 211 is approximately equal to the outer size of the first magnetic gap 201, and the size of the second through hole 221 is approximately equal to the size of the second magnetic gap 202, for example, in the embodiment in which the annular body 208 is provided, the size of the second through hole 221 is equal to the annular hole size of the annular body 208. So as to ensure that the first yoke plate 21 and the second yoke plate 22 can play a better role in magnetic conduction. Therefore, the first yoke plate 21 and the second yoke plate 22 can be used as magnetic conduction plates of the magnetic circuit system 20, so that the magnetic conduction plates do not need to be additionally arranged in the magnetic circuit system 20, and the thickness of the sound generating device is further reduced. The number of magnetic conductive plates of the sounding device can be reduced, the structure of the sounding device can be simplified, and the assembly process can be reduced.

The first voice coil 32 and the second voice coil 42 are both annular voice coils, corresponding to the first center magnet 204 being at least partially inside the first voice coil 32 and the second center magnet 205 being at least partially inside the second voice coil 42. When the first magnetic gap 201 is formed on the circumferential side of the first center magnet 204, an effective magnetic field (a magnetic field capable of effectively driving the first voice coil 32) may be formed at each position in the circumferential direction of the first center magnet 204, or an effective magnetic field may be formed at a part of the circumferential direction of the first center magnet 204, for example, an effective magnetic field may be formed at both opposite sides of the first center magnet 204. Wherein an electrical signal may be input to the first voice coil 32 and the second voice coil 42, respectively. The first vibration system 30 and the second vibration system 40 may vibrate separately or simultaneously.

In the present invention, the magnetic circuit 20 includes a first central magnet 204, a second central magnet 205, a first yoke plate 21 and a second yoke plate 22, where the first yoke plate 21 and the second yoke plate 22 are disposed in parallel between the first diaphragm 31 and the second diaphragm 41, a first magnetic gap 201 into which the first voice coil 32 extends is formed on a peripheral side of the first central magnet 204, one side of the first central magnet 204 facing away from the first diaphragm 31 is connected to the second yoke plate 22, a second magnetic gap 202 into which the second voice coil 42 extends is formed on a peripheral side of the second central magnet 205, and one side of the second central magnet 205 facing away from the second diaphragm 41 is connected to the first yoke plate 21. By connecting at least one of the first yoke plate 21 and the second yoke plate 22 with the housing 10, the first center magnet 204 and the second center magnet 205 can be fixed in the housing 10. And by arranging the first central magnet 204 and the second central magnet 205 in a flat manner between the first yoke plate 21 and the second yoke plate 22, the situation that the first central magnet 204 and the second central magnet 205 are arranged in a laminated manner is avoided, and the situation that the first voice coil 32 and the second voice coil 42 share a magnetic gap in the arrangement direction of the first diaphragm 31 and the second diaphragm 41 is also avoided. That is, compared with the mode in which the first center magnet 204 and the second center magnet 205 are stacked, the thickness of the magnetic circuit system 20 can be reduced while double-sided sound production is realized, and the thickness of the sound production device can be reduced.

So still make first voice coil 32 can be in first magnetic gap 201 independently to can make the interval of first magnetic gap 201 less, thereby can promote magnetic field utilization, promote the BL value that first voice coil 32 produced in first magnetic gap 201 (force coefficient, i.e. the product of magnetic field strength B (Tesla) and audio conductor length (meter)), can wholly promote product performance. And when promoting magnetic field utilization, can reduce the quality of first voice coil 32, be favorable to promoting the intermediate frequency loudness of product. Similarly, the second voice coil 42 can be independently located in the second magnetic gap 202, so that the distance between the second magnetic gaps 202 is smaller, and therefore the magnetic field utilization rate can be improved, and the BL value generated by the second voice coil 42 in the second magnetic gap 202 can be improved. And when promoting magnetic field utilization, can reduce the quality of second voice coil 42, be favorable to promoting the intermediate frequency loudness of product.

In this embodiment, the first yoke plate 21 and the second yoke plate 22 are both connected to the housing 10 to ensure the stability of the magnetic circuit system 20. Of course, in other embodiments, only the first yoke plate 21 may be connected to the housing 10, and in this case, a connecting member may be disposed between the first central magnet 204 and the second central magnet 205, and the first central magnet 204 and the second central magnet 205 may be spaced from the connecting member, and two opposite sides of the connecting member may be connected to the first yoke plate 21 and the second yoke plate 22, respectively, so that when one of the first yoke plate 21 and the second yoke plate 22 is connected to the housing 10, the other one may be fixed. The connecting piece can be a magnet, or the connecting piece has magnetic permeability, or the connecting piece is a non-magnet and does not have magnetic permeability.

In an embodiment, the magnetic circuit system 20 includes two second center magnets 205, the two second center magnets 205 are disposed on opposite sides of the first center magnet 204, a second magnetic gap 202 is formed on a circumferential side of each second center magnet 205, and a second voice coil 42 is disposed in the second vibration system 40 corresponding to each second magnetic gap 202. That is, the second vibration system 40 is provided with two second voice coils 42, and the two second voice coils 42 are independently disposed in one second magnetic gap 202, and by disposing the two second center magnets 205 on opposite sides of the first center magnet 204, it is possible to ensure that the second diaphragm 41 is uniformly stressed, and to effectively suppress the split vibration. And drive the vibration of second vibrating diaphragm 41 through two second voice coils 42, can improve electroacoustic conversion efficiency, provide higher sound pressure level, do benefit to the improvement loudness of making sound.

Of course, in other embodiments, only one first center magnet 204 and one second center magnet 205 may be provided, or two first center magnets 204 and two second center magnets 205 may be provided, or two first center magnets 204 and three second center magnets 205 may be provided, any one first center magnet 204 may be located between two adjacent second center magnets 205, and so on. In other embodiments, the first central magnet 204 may be annular, the second central magnet 205 may be disposed in an annular hole of the first central magnet 204, or the second central magnet 205 may be annular, and the first central magnet 204 may be disposed in an annular hole of the second central magnet 205.

In one embodiment, the magnetic circuit system 20 further includes a ring magnet 208, the ring magnet 208 is disposed around the second center magnet 205, and the ring magnet 208 is located between the first yoke plate 21 and the second yoke plate 22, and a second magnetic gap 202 is formed between the ring magnet 208 and the second center magnet 205. At least one of the ring magnet 208 and the second center magnet 205 is a magnet, that is, at least one of the ring magnet 208 and the second center magnet 205 is a magnet, and the other has magnetic permeability, and the ring magnet 208 is connected between the first yoke plate 21 and the second yoke plate 22. In this embodiment, the second center magnet 205 and the ring magnet 208 are both magnets. By providing the ring magnet 208, an effective magnetic field can be ensured to be formed around the second center magnet 205, and the utilization rate of the internal space of the sound generating device can be improved, and the magnetic circuit efficiency can be improved. Moreover, when the second central magnet 205 and the annular magnet 208 are both magnets, the magnetic field strength of the second magnetic gap 202 can be improved, so as to further improve the vibration effect of the second vibration system 40. The ring magnet 208 may have a circular ring shape, or a polygonal shape such as a quadrangle, a pentagon, a hexagon, or the like.

In the embodiment where two second center magnets 205 are provided, a ring magnet 208 is provided on the outer periphery of each second center magnet 205. When the ring magnet 208 is a magnet, two magnetic poles of the ring magnet 208 may be distributed along the arrangement direction of the first diaphragm 31 and the second diaphragm 41, and the second center magnet 205 and the ring magnet 208 are opposite magnetic poles on the side facing the first diaphragm 31. Alternatively, the two magnetic poles of the ring magnet 208 may be arranged along the inner and outer sides, and the second center magnet 205 and the ring magnet 208 are opposite magnetic poles on the side facing the first diaphragm 31. Of course, in other embodiments, a bar magnet may be provided on the outer periphery of the second center magnet 205, or when the second center magnet 205 is provided as a magnet, the outer periphery of the second center magnet 205 may be provided without a magnet or a magnetizer.

In one embodiment, the ring magnet 208 is spaced from the first center magnet 204 and the first voice coil 32 is partially positioned between the ring magnet 208 and the first center magnet 204. In this embodiment, the first central magnet 204 and the annular magnet 208 are both magnets, and the first central magnet 204 and the annular magnet 208 are correspondingly provided with special-shaped magnetic poles, so that magnetic lines of force can be directed from the first central magnet 204 to the annular magnet 208 or magnetic lines of force can be directed from the annular magnet 208 to the first central magnet 204. Thus, the annular magnet 208 and the first central magnet 204 can be utilized to form part of the first magnetic gap 201, so that the utilization rate of the internal space of the sound generating device can be improved, the magnetic circuit efficiency can be improved, and the structure of the sound generating device can be more compact. Optionally, the first central magnet 204 and the ring magnet 208 are square (may be rectangular or square), so as to reduce the gap between the first central magnet 204 and the ring magnet 208, so that the magnetic circuit system 20 is more compact. Of course, in embodiments thereof, the first central magnet 204 may be a magnet, the ring magnet 208 may have magnetic permeability, or the first central magnet 204 may have magnetic permeability, and the ring magnet 208 may be a magnet.

In one embodiment, the magnetic circuit system 20 further includes a third yoke plate 23 and a third center magnet 206, one side of the first center magnet 204 facing away from the second yoke plate 22 is connected to the third yoke plate 23, the first center magnet 204 is annular, the third center magnet 206 is disposed in an annular hole of the first center magnet 204 and is connected to the third yoke plate 23, a third magnetic gap 203 is formed between the third center magnet 206 and the first center magnet 204, the second vibration system 40 further includes a third voice coil 43 disposed on the second diaphragm 41, and the third voice coil 43 at least partially extends into the third magnetic gap 203.

Specifically, at least one of the first center magnet 204 and the third center magnet 206 is a magnet, the third voice coil 43 is a ring-shaped voice coil, the size of the third yoke plate 23 is not larger than the inner diameter of the first voice coil 32, the third yoke plate 23 does not interfere with the first voice coil 32, and by connecting the third yoke plate 23 to the side of the first center magnet 204 facing away from the second yoke plate 22, the fixing of the third yoke plate 23 can be achieved, and the interference of the third yoke plate 23 with the fixing of the first voice coil 32 can be avoided. When the third center magnet 206 is attached to the third yoke plate 23, the third center magnet 206 can be fixed, and the third voice coil 43 can extend into the third magnetic gap 203 from the side of the third center magnet 206 facing away from the third yoke plate 23. This prevents the third yoke plate 23 from occupying the space of the third magnetic gap 203 and also prevents the third voice coil 43 from interfering with the third yoke plate 23. By providing the third center magnet 206 and the third voice coil 43, the vibration performance of the second vibration system 40 can be further improved, and the split vibration can be effectively suppressed.

In the embodiment where the third voice coil 43 is provided, the second yoke 22 plate is further provided with a third through hole at a position corresponding to the third magnetic gap 203, and the third voice coil 43 extends into the third magnetic gap 203 through the third through hole. Of course, in other embodiments, a magnetically permeable plate may be provided in addition. In one embodiment, the third yoke plate 23 has magnetic permeability.

To increase the magnetic circuit efficiency, in one embodiment, the first center magnet 204, the second center magnet 205, the ring magnet 208, and the third center magnet 206 are all magnets. Taking the arrangement of the magnetic poles of the first central magnet 204 as an example, the two magnetic poles of the first central magnet 204 may be distributed along the arrangement direction of the first diaphragm 31 and the second diaphragm 41, at this time, the sides of the first central magnet 204 and the third central magnet 206 facing the first diaphragm 31 may be opposite magnetic poles, the sides of the first central magnet 204 and the annular magnet 208 facing the first diaphragm 31 may be opposite magnetic poles, and the sides of the annular magnet 208 and the second central magnet 205 facing the first diaphragm 31 may be opposite magnetic poles. Alternatively, one of the magnetic poles of the first central magnet 204 may be disposed around the other magnetic pole (i.e., when the first central magnet 204 is annular, the two magnetic poles of the first central magnet 204 may be distributed along the direction in which the inner annular surface faces the outer annular surface), and at this time, the first central magnet 204 and the third central magnet 206 may be disposed opposite to each other with the opposite magnetic poles, the first central magnet 204 and the annular magnet 208 may be disposed opposite to each other with the opposite magnetic poles, and the annular magnet 208 and the second central magnet 205 may be disposed opposite to each other with the opposite magnetic poles. Alternatively, the first center magnet 204, the second center magnet 205, the ring magnet 208, and the third center magnet 206 may each be square (may be rectangular or square) to reduce a gap between adjacent two, so that the magnetic circuit system 20 is more compact in structure.

In one embodiment, the surface of the second central magnet 205 facing away from the first yoke plate 21 is provided with a first central magnetically permeable plate. The side of the third central magnet 206 facing away from the third yoke plate 23 is provided with a second central magnetically permeable plate.

Referring to fig. 1 and fig. 5 in combination, in order to reduce the possibility of polarization of the first vibration system 30, in one embodiment, the first vibration system 30 includes a first centering support 33, and the first centering support 33 connects the housing 10 and the first voice coil 32. Optionally, in an embodiment, the first centering support 33 includes a first annular connecting portion 331, a first annular supporting portion 332 located inside the first annular connecting portion 331, and a first elastic arm 333 connecting the first annular connecting portion 331 and the first annular supporting portion 332, the first annular connecting portion 331 is connected to the housing 10, and the first annular supporting portion 332 is connected to the first voice coil 32. Specifically, the first annular connecting portion 331 is disposed between the end surface of the housing 10 and the first diaphragm 31, and the first annular supporting portion 332 is disposed inside the first annular connecting portion 331. By doing so, the connection area between the first annular connection portion 331 and the housing 10 is made larger, and the connection stability of the first positioning stay 33 can be increased. But also makes the first centering tabs 33 as a whole, the number of centering tabs can be reduced. Of course, in other embodiments, there may be a plurality of first centering struts 33, and each first centering strut 33 is connected to one first voice coil 32.

Referring to fig. 1 and 6 in combination, in order to reduce the possibility of deflection of the second vibration system 40, in one embodiment, the first vibration system 30 includes a second centering pad 44, and the second centering pad 44 connects the housing 10 and the second voice coil 42. Optionally, in an embodiment, the second centering pad 44 includes a second annular connecting portion 441, a second annular supporting portion 442 located inside the second annular connecting portion 441, and a second elastic arm 445 connecting the second annular connecting portion 441 and the second annular supporting portion 442, the second annular connecting portion 441 is connected to the housing 10, and the second annular supporting portion 442 is connected to the second voice coil 42.

The second annular connecting portion 441 is disposed between an end surface of the housing 10 facing away from the first diaphragm 31 and the second diaphragm 41, and the second annular supporting portion 442 is located inside the second annular connecting portion 441. By doing so, the connection area between the second annular connection portion 441 and the housing 10 is made larger, and the connection stability of the second centering support 44 can be increased. But also the second centering tabs 44 are made integral, which can reduce the number of centering tabs. Of course, in other embodiments, there may be a plurality of second centering struts 44, and each second centering strut 44 is connected to one second voice coil 42.

In one embodiment, two ends of the second annular supporting portion 442 of the second centering support piece 44 are respectively formed with a supporting ring portion 443, and each supporting ring portion 443 is connected to a second voice coil 42. Specifically, each of the two ends of the second annular supporting portion 442 is provided with a supporting rib 444, two ends of the supporting rib 444 are respectively connected to two long sides of the second annular supporting portion 442, and each supporting rib 444 is spaced from a short side of an end of the second annular supporting portion 442 correspondingly to form a supporting ring 443. Therefore, each second voice coil 42 is correspondingly connected with one supporting ring 443, so that the connection area between each second voice coil 42 and the second annular supporting portion 442 can be ensured to be larger, and the connection stability of the second voice coils 42 can be improved. And two second voice coils 42 are simultaneously connected through one second centering support piece 44, so that the vibration of the two second voice coils 42 is more consistent, and the split vibration can be effectively restrained.

In one embodiment, the second centering support 44 further includes a third annular supporting portion 446 and a connecting arm 447, the third annular supporting portion 446 is located inside the second annular supporting portion 442 and between the two supporting ring portions 443, the connecting arm 447 connects the second annular supporting portion 442 and the third annular supporting portion 446, and the third annular supporting portion 446 is connected to the third voice coil 43 of the second vibration system 40. That is, the third annular supporting portion 446 is provided on the inner side of the second annular supporting portion 442 corresponding to the third voice coil 43 for fixing the third voice coil 43, so that the second centering support 44 connects the two second voice coils 42 and the third voice coil 43 at the same time, so that the vibrations of the two second voice coils 42 and the third voice coil 43 are relatively consistent, and the split vibration can be effectively suppressed. Wherein the connecting arms 447 may be rigid or resilient members.

Referring to fig. 2, in an embodiment, the magnetic circuit 20 further includes two first side magnets 24, the two first side magnets 24 are disposed on opposite sides of the first center magnet 204 and are spaced apart from the first center magnet 204, and a portion of the first magnetic gap 201 is formed between the first side magnets 24 and the first center magnet 204. By providing the first side magnets 24 on opposite sides of the first center magnet 204, the magnetic induction of the first magnetic gap 201 can be increased to improve the vibration performance of the first vibration system 30.

Referring to fig. 1 and fig. 7 in combination, in an embodiment, the second yoke plate 22 is provided with a first pressure relief hole 222, and the first pressure relief hole 222 communicates with the spaces on both sides of the second yoke plate 22, so as to be able to balance the air pressure in the spaces on both sides of the second yoke plate 22. In an embodiment, the casing 10 is provided with a second pressure relief hole 12, and the second pressure relief hole 12 is communicated with the inner cavity of the casing 10, so as to balance the air pressure inside the sound generating device. In an embodiment, the second pressure relief hole 12 is communicated with a space on one side of the second side plate, so that the first pressure relief hole 222 and the second pressure relief hole 12 can be communicated with each other, and thus the air pressure in each space inside the sound generating device can be balanced better.

In addition, unlike the embodiment in which the two second center magnets 205 are disposed on opposite sides of the first center magnet 204, referring to fig. 8 and 9, in another embodiment, the magnetic circuit 20 includes two first center magnets 204 and two second center magnets 205, the two first center magnets 204 and the two second center magnets 205 are alternately arranged along the circumferential direction of the first diaphragm 31, the circumferential side of each first center magnet 204 forms a first magnetic gap 201, the circumferential side of each second center magnet 205 forms a second magnetic gap 202, the first vibration system 30 is provided with a first voice coil 32 corresponding to each first magnetic gap 201, and the second vibration system 40 is provided with a second voice coil 42 corresponding to each second magnetic gap 202. So set up for the first vibrating diaphragm 31 of first vibration system 30 is driven by two first voice coils 32, and the second vibrating diaphragm 41 of second vibration system 40 is driven by two second voice coils 42, so can improve the holistic electroacoustic conversion efficiency of sound generating set, provide higher sound pressure level, do benefit to the whole sound loudness that makes sound generating set. And through arranging two first central magnets 204 and two second central magnets 205 alternately in proper order along the circumference of first vibrating diaphragm 31, can make the arrangement of magnetic circuit 20 compacter, be favorable to reducing sound generating mechanism's length.

In one embodiment, the magnetic circuit system 20 further includes a fourth center magnet 207, the fourth center magnet 207 being located between the two first center magnets 204 and between the two second center magnets 205, a portion of the first magnetic gap 201 being formed between the first center magnets 204 and the fourth center magnet 207, and a portion of the second magnetic gap 202 being formed between the second center magnets 205 and the fourth center magnet 207. That is, two first center magnets 204 and two second center magnets 205 are looped around the fourth center magnet 207, the first voice coil 32 is partially located between the first center magnets 204 and the fourth center magnet 207, and the second voice coil 42 is partially located between the second center magnets 205 and the fourth center magnet 207. In this embodiment, the first center magnet 204, the second center magnet 205 and the fourth center magnet 207 are all magnets, so that the space between the two first center magnets 204 and the space between the two second center magnets 205 can be fully utilized, so that the fourth center magnet 207 can be utilized by the two first voice coils 32 and the two second voice coils 42, the internal space utilization rate of the sound generating device can be improved, and the magnetic circuit efficiency can be improved. Of course, in other embodiments, the first central magnet 204 and the second central magnet 205 may be configured as magnets, and the fourth central magnet 207 has magnetic permeability, so that the magnetic lines of force of the first magnetic gap 201 and the second magnetic gap 202 can be modified by the fourth central magnet 207, and the fourth central magnet 207 can be utilized by the two first voice coils 32 and the two second voice coils 42, so that the utilization rate of the internal space of the sound generating device can be improved. In addition, the first center magnet 204 and the second center magnet 205 may be provided as members having magnetic permeability, and the fourth center magnet 207 may be provided as magnets, so that the fourth center magnet 207 can be utilized by the two first voice coils 32 and the two second voice coils 42, and the utilization rate of the internal space of the sound generating device can be improved.

In one embodiment, the first yoke plate 21 includes a first support portion 212 and a first connection portion 213 connected to the first support portion 212, the first connection portion 213 is connected to the housing 10, the first support portion 212 extends along the arrangement direction of the two second center magnets 205, and the two second center magnets 205 are connected to the first support portion 212. The second yoke plate 22 includes a second support portion 223, the second support portion 223 extending in the arrangement direction of the two first center magnets 204, the two first center magnets 204 being connected to the second support portion 223. The two first voice coils 32 extend into the first magnetic gap 201 from the opposite sides in the width direction of the first support portion 212, and the two second voice coils 42 extend into the second magnetic gap 202 from the opposite sides in the width direction of the second support portion 223.

Specifically, the first support portion 212 and the second support portion 223 are elongated, and the longitudinal direction of the first support portion 212 and the longitudinal direction of the second support portion 223 are substantially perpendicular. The distance between the two first center magnets 204 is larger than the width of the first supporting portion 212, so as to ensure that the two first center magnets 204 can be exposed to the first diaphragm 31, thereby ensuring that the first voice coil 32 can extend into the first magnetic gap 201. Similarly, the distance between the two second center magnets 205 is larger than the width of the second supporting portion 223, so as to ensure that the two second center magnets 205 can be exposed towards the second diaphragm 41, thereby ensuring that the second voice coil 42 can extend into the second magnetic gap 202. By this arrangement, the first and second center magnets 204 and 205 can be secured, and the first and second support portions 212 and 223 can be prevented from occupying the space in the depth direction of the first and second magnetic gaps 201 and 202. Of course, in other embodiments, the first yoke plate 21 may be provided with a relief through hole corresponding to the first voice coil 32, and the second yoke plate 22 may be provided with a relief through hole corresponding to the second voice coil 42.

In the embodiment in which the fourth center magnet 207 is provided, the fourth center magnet 207 is located between the first support 212 and the second support 223. At this time, the opposite sides of the fourth center magnet 207 may be connected to the first support portion 212 and the second support portion 223, respectively, so that the first yoke plate 21 and the second yoke plate 22 are fixed to each other, that is, the second yoke plate 22 may be fixed to the first yoke plate 21, and the first yoke plate 21 may be connected by the first connection portion 213, so that the second yoke plate 22 may not be connected to the housing 10. Of course, to further ensure the stability of the magnetic circuit system 20, the second yoke plate 22 may be connected to the housing 10.

In an embodiment, the first connecting portion 213 is annular, one end of the first supporting portion 212 is connected to one side of the first connecting portion 213, the other end is connected to the other side of the first connecting portion 213, and two opposite sides of the first supporting portion 212 in the width direction are spaced from the first connecting portion 213 for the first voice coil 32 to pass through. In this way, the first connecting portion 213 can be integrally connected to the housing 10, so that the connection reliability between the first yoke plate 21 and the housing 10 can be increased, and the structural strength of the housing 10 can be enhanced by the first connecting portion 213. Of course, in other embodiments, the first connecting portion 213 may be a portion of an end of the first supporting portion 212, that is, may be elongated corresponding to the first yoke plate 21.

In an embodiment, the second yoke plate 22 further includes a second connection portion 224, where the second connection portion 224 is annular and is connected to the housing 10, one end of the second support portion 223 is connected to one side of the second connection portion 224, the other end is connected to the other side of the second connection portion 224, and two opposite sides of the second support portion 223 in the width direction are spaced from the second connection portion 224 for the second voice coil 42 to pass through. In this way, the second connecting portion 224 can be integrally connected to the housing 10, so that the connection reliability between the second yoke plate 22 and the housing 10 can be increased, and the structural strength of the housing 10 can be enhanced by the second connecting portion 224. Of course, in other embodiments, the second connection portion 224 may be a portion of an end of the second supporting portion 223, that is, a portion corresponding to the second yoke plate 22 having a long strip shape.

In an embodiment, the magnetic circuit system 20 further includes two first side magnets 24, and any one of the first side magnets 24 is disposed at a distance from one side of the first center magnet 204 away from the other first center magnet 204, and is connected to the second supporting portion 223. That is, the sides of the two first center magnets 204 facing away from each other are spaced apart from the first connecting portion 213, and the first side magnet 24 is located between the first center magnet 204 and the first connecting portion 213. By providing one first side magnet 24 on the side of each first center magnet 204 facing away from the other first center magnet 204, the magnetic induction of the first magnetic gap 201 can be increased to improve the vibration performance of the first vibration system 30. The first side magnet 24 can be supported by the first support 212, and the utilization rate of the first yoke plate 21 can be improved.

Further, in an embodiment, the first yoke plate 21 has magnetic permeability, and the first yoke plate 21 further includes a first side magnetic permeability plate 214, where the first side magnetic permeability plate 214 is connected to the inner side of the first connecting portion 213 and to a side of the first side magnet 24 facing away from the second supporting portion 223. In this way, when the first side magnetic plate 214 is used to correct the magnetic force lines between the first side magnet 24 and the first center magnet 204, the first side magnet 24 can be restricted from moving in the direction away from the second support portion 223 by the first side magnetic plate 214, so that the stability of the magnetic circuit 20 can be improved. In addition, when the first side magnetic plate 214, the first connecting portion 213, and the first supporting portion 212 are integrally formed, the number of connecting steps for the three can be reduced.

In an embodiment, the magnetic circuit system 20 further includes two second side magnets 25, and any one of the second side magnets 25 is disposed at a distance from one side of the second center magnet 205 facing away from the other second center magnet 205, and is connected to the first support portion 212. That is, the sides of the two second center magnets 205 facing away from each other are spaced apart from the second connection portion 224, and the second side magnets 25 are located between the second center magnets 205 and the second connection portion 224. By providing a second side magnet 25 on the side of each second center magnet 205 facing away from the other second center magnet 205, the magnetic induction of the second magnetic gap 202 can be increased to enhance the vibration performance of the second vibration system 40. The second side magnet 25 can be supported by the second support portion 223, and the utilization rate of the second yoke plate 22 can be improved.

In one embodiment, the second yoke plate 22 has magnetic permeability, and the second yoke plate 22 further includes a second side magnetic permeable plate 225, where the second side magnetic permeable plate 225 is connected to the inner side of the second connecting portion 224 and to a side of the second side magnet 25 facing away from the first supporting portion 212. In this way, when the second side magnetic plate 225 is used to correct the magnetic force lines between the second side magnet 25 and the second center magnet 205, the second side magnet 25 can be restrained from moving in a direction away from the first support 212 by the second side magnetic plate 225, so that the stability of the magnetic circuit 20 can be improved. In addition, when the second side magnetic plate 225, the second connecting portion 224, and the second supporting portion 223 are integrally formed, the connecting process of the three can be reduced.

In an embodiment, the lengths of the two first central magnets 204 along the arrangement direction of the two second central magnets 205 are gradually increased in the direction away from each other, and the lengths of the two second central magnets 205 along the arrangement direction of the two first central magnets 204 are gradually increased in the direction away from each other. Specifically, the shape of the first voice coil 32 is substantially the same as the shape of the first center magnet 204, and the shape of the second voice coil 42 is substantially the same as the shape of the second center magnet 205. Compared with the arrangement of the first central magnet 204 and the second central magnet 205 which are square, the gap between the adjacent first central magnet 204 and second central magnet 205 can be reduced, the utilization rate of the internal space of the sound generating device can be improved, and the magnetic circuit efficiency can be improved.

Referring to fig. 8 and 10 in combination, in an embodiment, the first vibration system 30 includes a first centering support 33, the first centering support 33 includes a first annular connecting portion 331 and two third supporting portions 334, the first annular connecting portion 331 is connected to the housing 10, and each third supporting portion 334 is connected to one of the first voice coils 32. Specifically, the first annular connecting portion 331 is disposed between the end surface of the housing 10 and the first diaphragm 31, and the third supporting portion 334 is disposed inside the first annular connecting portion 331. By doing so, the connection area between the first annular connection portion 331 and the housing 10 is made larger, and the connection stability of the first positioning stay 33 can be increased. And two first voice coils 32 are simultaneously connected through one first centering support piece 33, so that the vibration of the two first voice coils 32 is more consistent, and the split vibration can be effectively restrained. Of course, in other embodiments, there may be a plurality of first centering struts 33, and each first centering strut 33 is connected to one first voice coil 32.

In an embodiment, the third supporting portion 334 of the first centering support 33 includes two first supporting arms 335, and the two first supporting arms 335 are spaced apart, and each first supporting arm 335 is connected between the first annular connecting portion 331 and the first voice coil 32. That is, the two first support arms 335 are independent from each other and are distributed at intervals along the arrangement direction of the two second voice coils 42, and the free ends of the two first support arms 335 are respectively disposed at two ends of the first voice coil 32 in the arrangement direction of the two second voice coils 42. In this way, the elasticity of each first supporting arm 335 can be ensured to be better, and the resistance of the first centering piece 33 to the first diaphragm 31 can be reduced. Of course, in other embodiments, the free ends of the two first support arms 335 may also be connected to each other.

Referring to fig. 8 and 11 in combination, in an embodiment, the second vibration system 40 further includes a second centering support piece 44, where the second centering support piece 44 includes a second annular connecting portion 441 and two fourth supporting portions 448, the second annular connecting portion 441 is connected to the housing 10, and each of the fourth supporting portions 448 is connected to one of the second voice coils 42. Specifically, the second annular connecting portion 441 is disposed between an end surface of the housing 10 facing away from the first diaphragm 31 and the second diaphragm 41, and the fourth supporting portion 448 is located inside the second annular connecting portion 441. By doing so, the connection area between the second annular connection portion 441 and the housing 10 is made larger, and the connection stability of the second centering support 44 can be increased. And two second voice coils 42 are simultaneously connected through one second centering support piece 44, so that the vibration of the two second voice coils 42 is more consistent, and the split vibration can be effectively restrained. Of course, in other embodiments, there may be a plurality of second centering struts 44, and each second centering strut 44 is connected to one second voice coil 42.

In an embodiment, the fourth supporting portion 448 of the second centering pad 44 includes two second supporting arms 449, one end of each second supporting arm 449 is connected to the second annular connecting portion 441, the two second supporting arms 449 are spaced apart, and each second supporting arm 449 is connected between the second annular connecting portion 441 and the second voice coil 42. That is, the two second supporting arms 449 are independent from each other and are distributed at intervals along the arrangement direction of the two first voice coils 32, and the free ends of the two second supporting arms 449 are respectively arranged at two ends of the second voice coil 42 in the arrangement direction of the two first voice coils 32. In this way, the elasticity of each second supporting arm 449 can be ensured to be better, and the resistance of the second centering support 44 to the second diaphragm 41 can be reduced. Of course, in other embodiments, the free ends of the two second support arms 449 may also be connected to each other.

Referring to fig. 7 or fig. 9, in an embodiment, the housing 10 includes two connection shells 11, the connection shells 11 are disposed with two ends open, and the open ends of the two connection shells 11 are connected. That is, the two connection cases 11 are separately provided, and when assembling, the open ends of the two connection cases 11 are connected, so that when assembling, the part of the magnetic circuit system 20 can be mounted on the connection case 11, and then the two connection cases 11 are connected, thereby facilitating the assembly of the housing 10 and the magnetic circuit system 20. For example, but not limited to, the first yoke plate 21 may be fixed to one of the connection cases 11, the second center magnet 205 may be fixed to the first yoke plate 21, the second yoke plate 22 may be fixed to the other connection case 11, and the first center magnet 204 may be fixed to the second yoke plate 22, and then the two connection cases 11 may be fixed. In one embodiment, both connection shells 11 are provided with a second pressure relief hole 12. In one embodiment, one of the connection housings 11 is integrally formed with the first yoke plate 21, and the other connection housing 11 is integrally formed with the second yoke plate 22. So can promote the structural strength of casing 10 through first yoke plate 21 and second yoke plate 22, can promote the stability of casing 10 and magnetic circuit 20, can also reduce sound generating mechanism spare part quantity in the assembly process, reduce the assembly process. Of course, in other embodiments, the housing 10 and yoke plate may be bonded or fastened together by screws or the like. In addition, in other embodiments, the housing 10 may be of unitary construction.

Referring to fig. 1 and 4 in combination, in an embodiment, the annular magnet 208 is partially sandwiched between the two connection shells 11, that is, the portion of the annular magnet 208 near the outer peripheral surface of the housing 10 is between the two connection shells 11, so that the distance between the annular magnet 208 and the outer peripheral surface of the housing 10 can be reduced, which is beneficial to reducing the length or width of the sound generating device.

Referring to fig. 1 or 8, in an embodiment, sd (effective vibration radiation area) of the first vibration system 30 and Sd of the second vibration system 40 are approximately equal, so that parameters of the first vibration system 30 and parameters of the second vibration system 40 are approximately equal, so as to reduce vibration generated when the sound generating device works due to the first vibration system 30 and the second vibration system 40, and achieve a better vibration reduction effect. In an embodiment, the BL values of the first vibration system 30 and the second vibration system 40 are approximately equal, so that the parameters of the first vibration system 30 and the second vibration system 40 are approximately equal, so as to reduce the vibration generated by the sound generating device when the first vibration system 30 and the second vibration system 40 work, and achieve a better vibration reduction effect. In an embodiment, the ms (equivalent mass) of the first vibration system 30 and the second vibration system 40 are approximately equal, so that the parameters of the first vibration system 30 and the second vibration system 40 are approximately equal, so as to reduce the vibration generated by the sound generating device when the first vibration system 30 and the second vibration system 40 work, and achieve a better vibration reduction effect. In an embodiment, cms (compliance) of the first vibration system 30 and the second vibration system 40 are approximately equal, so that parameters of the first vibration system 30 and the second vibration system 40 are approximately equal, so as to reduce vibration generated by the sound generating device when the first vibration system 30 and the second vibration system 40 work, and achieve a better vibration reduction effect.

In an embodiment, sd (effective vibration radiation area) of the first vibration system 30 and Sd of the second vibration system 40 are approximately equal, BL values of the first vibration system 30 and BL values of the second vibration system 40 are approximately equal, mms (equivalent mass) of the first vibration system 30 and the second vibration system 40 are approximately equal, cms (compliance) of the first vibration system 30 and Cms of the second vibration system 40 are approximately equal, so that parameters of the first vibration system 30 and the second vibration system 40 are approximately equal, vibration generated when the sound generating device works due to the first vibration system 30 and the second vibration system 40 is reduced, and a better vibration damping effect can be achieved.

In an embodiment, the masses of the first vibration system 30 and the second vibration system 40 are approximately equal, so as to reduce the vibration generated by the sound generating device when the first vibration system 30 and the second vibration system 40 work, and achieve a better vibration reduction effect.

In one embodiment, the two first voice coils 32 in the first vibration system 30 are arranged in a central symmetry manner, so as to improve the balance of the first vibration system 30 and reduce the separation vibration. In one embodiment, the third voice coil 43 and the two first voice coils 32 in the first vibration system 30 are arranged in a central symmetry manner, so as to improve the balance of the first vibration system 30 and reduce the separation vibration. In one embodiment, the two second voice coils 42 of the second vibration system 40 are arranged in a central symmetry manner to improve the balance of the second vibration system 40 and reduce the separation vibration.

Referring to fig. 12 to 14, in one embodiment, the first diaphragm 31 is a conductive diaphragm, a first conductive layer 34 is disposed on the first diaphragm 31, a first bonding pad 131 is disposed on the housing 10, and the first conductive layer 34 is electrically connected to the first voice coil 41 and the first bonding pad 131; it can be appreciated that the first conductive layer 34 and the first diaphragm 31 are integrally connected, so that compared with the technical scheme of providing independent wires to connect the first voice coil 41 and the first pad 131, the technical scheme of the embodiment has fewer independent parts, and the product is simpler and more compact, and can avoid the influence of the independent wires on the sound effect of the product caused by touching the first diaphragm 31. In this embodiment, similar to the first diaphragm 31, the second diaphragm 41 is also a conductive diaphragm, specifically, a second conductive layer is disposed on the second diaphragm 41, and a second bonding pad is further disposed on the housing 10, where the second conductive layer electrically connects the second voice coil 42 and the second bonding pad. It should be noted that, in other embodiments, only one of the first diaphragm 31 and the second diaphragm 41 may be configured as a conductive diaphragm.

In an embodiment, referring to fig. 14, the first diaphragm 31 includes a first ring portion 311 extending along a first annular axis 311a, the first conductive layer 34 includes a first conductive segment 341a disposed on the first ring portion 311, and the first conductive segment 341a is disposed in an arc shape perpendicular to the first annular axis 311a, so that the length of the first conductive segment 341a is the shortest, the required materials are the least, and the cost is the lowest. However, in other embodiments, referring to fig. 15, the first conductive segment 341a may also be disposed in an arc shape not perpendicular to the first annular axis 311a, so that the length of the first conductive segment 341a is longer, and thus, when the first diaphragm 31 vibrates to sound, the first conductive segment 341a can have more margin capable of following the deformation of the first bending portion, so as to reduce the fracture probability of the first conductive segment 341a and prolong the service life of the product. In still other embodiments, referring to fig. 16, the first conductive segment 341a may be continuously bent, so that the length of the first conductive segment 341a is longer, which may follow the deformation allowance of the first bending portion more, and the probability of deformation fracture is lower.

In an embodiment, the second diaphragm 41 includes a second ring portion extending along the second annular axis, the second conductive layer includes a second conductive segment disposed on the second ring portion, and the second conductive segment is disposed in an arc shape perpendicular to the second annular axis, so that the length of the second conductive segment is shortest, the required material is saved, and the cost is lowest. However, the design is not limited thereto, and in other embodiments, the second conductive section may be disposed in an arc shape not perpendicular to the second annular axis, so that the length of the second conductive section is longer, and thus, when the second diaphragm 41 vibrates to sound, the second conductive section can have more margin capable of following the deformation of the second bending portion, so that the probability of fracture of the second conductive section is reduced, and the service life of the product is prolonged. In still other embodiments, the second conductive segment may be continuously bent, so that the second conductive segment has a longer length, and may follow the deformation of the second bent portion by more margin, and the probability of deformation fracture is lower.

In an embodiment, the first conductive layer 34 is printed or sprayed on the first diaphragm 31, and the printing and spraying processes are both beneficial to batch preparation of the first diaphragm 31 and improve the production efficiency thereof. However, the present design is not limited thereto, and in other embodiments, the first conductive layer 34 may be, but not limited to, a conductive film adhered to the first diaphragm 31, or a conductive film sandwiched between layers of the first diaphragm 31. The material of the first conductive layer 34 may be, but not limited to, a material of any one or more of epoxy, polyester, and silicone mixed with conductive particles, and the conductive particles may be silver particles, etc.

In an embodiment, the second conductive layer is printed or sprayed on the second diaphragm 41, and the printing and spraying processes are both beneficial to batch preparation of the second diaphragm 41, so as to improve the production efficiency thereof. However, the present design is not limited thereto, and in other embodiments, the second conductive layer may be, but not limited to, a conductive film adhered to the second diaphragm 41, or a conductive film sandwiched between the second diaphragm 41, and the material of the second conductive layer may be, but not limited to, a mixture of conductive particles in any one or more of epoxy, polyester, and silicone, and the conductive particles may be silver particles.

In an embodiment, referring to fig. 13 and 14, the first conductive layer 34 includes a first conductive line 341 and two first conductive connection portions 342 disposed at two ends of the first conductive line 341, the two first conductive connection portions 342 are electrically connected to the first voice coil 41 and the first bonding pad 131, and the first insulating layer 35 covering the first conductive line 341 is further disposed on the first diaphragm 31, so that the probability of product leakage can be reduced. It should be noted that the first conductive segment 341a is a portion of the first conductive line 341. In this embodiment, the first insulating layer 35 may cover the first conductive line 341 by, but not limited to, an insulating paste or an insulating varnish. And the two first conductive connection portions 342 are generally arranged in a solder disc shape exposed to the outside so as to facilitate connection thereof with the leads of the first voice coil 41 and the first pads 131. It will be appreciated that the edge of the first diaphragm 31 is usually adhered to the housing 10, and optionally, one of the first conductive connecting portions 342 is adhered to the first bonding pad 131 by conductive adhesive, so that not only can effective electrical conduction between the first conductive layer 34 and the first bonding pad 131 be achieved, but also the first diaphragm 31 and the housing 10 can be assisted to be adhered and fixed.

In an embodiment, the second conductive layer includes a second conductive circuit and two second conductive connection portions respectively disposed at two ends of the second conductive circuit, the two second conductive connection portions are electrically connected with the second voice coil 42 and the second pad, and a second insulating layer covering the second conductive circuit is further disposed on the second diaphragm 41, so that the probability of product leakage can be reduced. It should be noted that the second conductive segment is a part of the second conductive line. In this embodiment, the second insulating layer may cover the second conductive line by, but not limited to, an insulating paste or an insulating varnish. And the two second conductive connections are generally provided in the form of externally exposed bond pads to facilitate connection thereof to the leads and second bond pads of the second voice coil 42. It will be appreciated that the edge of the second diaphragm 41 is typically adhered to the housing 10, and optionally, one of the second conductive connection portions is adhered to the second pad by conductive adhesive, so that not only effective electrical conduction between the second conductive layer and the second pad can be achieved, but also auxiliary adhesion of the second diaphragm 41 and the housing 10 can be achieved.

In an embodiment, referring to fig. 17 and 18, the first bonding pad 131 is injection-molded and fixed to the housing 10, and the injection molding process is beneficial to mass production of products and improves production efficiency thereof. Without loss of generality, the housing 10 is provided with a first conductive terminal 13 corresponding to the first voice coil 41, the first bonding pad 131 is one end of the first conductive terminal 13 close to the first diaphragm 31, and one end of the first conductive terminal 13 far away from the first bonding pad 131 is further formed with another bonding pad for supplying power for electric connection input. In other embodiments, but not limited to, a first jack may be provided on the housing 10 for the first pad 131 to be tightly inserted.

In one embodiment, the second bonding pad is fixed on the housing 10 by injection molding, and the injection molding process is beneficial to batch preparation of products and improves the production efficiency thereof. Without loss of generality, the housing 10 is provided with a second conductive terminal corresponding to the second voice coil 42, the second bonding pad is one end of the second conductive terminal close to the second diaphragm 41, and one end of the second conductive terminal far away from the second bonding pad is further formed with another bonding pad for supplying power for electric connection input. In other embodiments, but not limited to, a second jack may be provided on the housing 10 for the second pad to be inserted.

The invention also provides electronic equipment, which comprises a shell and a sound generating device, wherein the specific structure of the sound generating device refers to the embodiment, and the electronic equipment adopts all the technical schemes of all the embodiments, so that the electronic equipment at least has all the beneficial effects brought by the technical schemes of the embodiments, and the detailed description is omitted. Wherein, sound generating mechanism locates in the shell. The electronic device can be a mobile phone, a smart watch, a tablet computer or a computer.

In an embodiment, referring to fig. 19 and 20, the housing 5 is provided with a mounting cavity 501 and two sound emitting parts 503, the sound generating device 1 separates the mounting cavity 501 into two sound emitting cavities 502, the first diaphragm 31 of the sound generating device 1 is communicated with one sound emitting part 503 through one sound emitting cavity 502, and the second diaphragm 41 of the sound generating device 1 is communicated with the other sound emitting part 503 through the other sound emitting cavity 502.

In this embodiment, the first diaphragm 31 of the sound generating device 1 is connected to one of the sound emitting cavities 502, the second diaphragm 41 of the sound generating device 1 is connected to the other sound emitting cavity 502, which means that the space on one side, away from each other, of the first diaphragm 31 and the second diaphragm 41 is respectively connected to the two sound emitting cavities 502 in a one-to-one correspondence manner, so that when the diaphragms vibrate to generate sound, sound can be transmitted from the sound emitting cavities 502 and the sound emitting portions 503 to the outside of the housing. The two sound emitting portions 503 are arranged at intervals on the housing, the sound emitting directions of the two sound emitting portions 503 are included or opposite, and the two sound emitting portions 503 can be located at different sides or other positions of the electronic device, for example, when the electronic device is a smart watch, the two sound emitting portions 503 can be both located at the peripheral side of the electronic device.

The electronic device has an external mode in which the first vibration system 30 and the second vibration system 40 of the sound generating apparatus 1 radiate sound waves of the same phase through the respective corresponding sound emitting portions 503, and an earpiece mode in which the first vibration system 30 and the second vibration system 40 radiate sound waves of opposite phases through the respective corresponding sound emitting portions 503. That is, in the external sound emitting mode, by controlling the first diaphragm 31 and the second diaphragm 41 to vibrate simultaneously in opposite directions, the first vibration system 30 and the second vibration system 40 radiate positive sound waves simultaneously through the corresponding sound emitting portions 503, so that the volume can be effectively increased, and the sound emitting device 1 can be used as a speaker to emit sound. In the earpiece mode, by controlling the first diaphragm 31 and the second diaphragm 41 to vibrate in the same direction at the same time, when one of the first vibration system 30 and the second vibration system 40 radiates the positive sound wave/the negative sound wave outwards through the corresponding sound outlet portion 503, the other radiates the negative sound wave/the positive sound wave outwards through the corresponding sound outlet portion 503. When the electronic device is used for talking, one of the sound emitting parts 503 is close to the ear of the user, the other sound emitting part 503 is far away from the ear of the user relative to the sound emitting part 503, and for people around the user, a sound dipole effect can be formed, specifically, the distance between the two sound emitting parts 503 is negligible, the distance between the two sound emitting parts 503 and the ear of the surrounding people is close, and the sound waves with opposite phases of the first vibration system 30 and the second vibration system 40 reach the ear position of the surrounding people to cancel each other out, so that the purpose of reducing the leakage sound is achieved. For the user, the distance from the two sound emitting parts 503 to the ears of the user is relatively large, the condition of the acoustic dipole effect is not satisfied, and the cancellation degree of the acoustic wave is small, so the user can hear the sound with proper loudness.

According to the technical scheme of the invention, the installation cavity 501 in the shell 5 is divided into two sound emitting cavities 502 through the sound emitting device 1, the sound emitting parts 503 are arranged on the shell 5 corresponding to each sound emitting cavity 502, and the first vibration system 30 and the second vibration system 40 of the sound emitting device 1 are respectively in one-to-one correspondence with the two sound emitting cavities 502, so that sound can be emitted through the two sound emitting parts 503. When a user uses the electronic device to talk, the electronic device can be arranged in a receiver mode, namely one of the sound emitting parts 503 is close to the ear, and the sound wave radiated outwards by the sound emitting part 503 close to the ear and the sound wave radiated outwards by the other sound emitting part 503 are opposite in phase by controlling the first vibration system 30 and the second vibration system 40, so that a sound dipole effect can be formed, sounds emitted by the two sound emitting parts 503 are offset from each other at the peripheral position of the user of the electronic device, the risk of sound leakage when the user uses the electronic device to talk can be reduced, and the privacy protection function of the electronic device during talking can be realized. In addition, the first vibration system 30 and the second vibration system 40 can work independently, so that parameters such as signals and voltages of the first vibration system 30 and the second vibration system 40 can be adjusted at will, and the best conversation and privacy protection effects can be achieved. In addition, the electronic device may be set in the sound emitting mode, that is, the first vibration system 30 and the second vibration system 40 may be controlled to radiate sound waves with the same phase outwards through the two sound emitting portions 503, so that the volume deficiency caused by the size of the sound emitting device 1 may be compensated, the volume may be effectively increased, and the sound emitting portion 503 may be used as a speaker to emit sound.

In the following embodiments, the electronic device is taken as an example of a mobile phone, but is not limited thereto. The housing 5 has a front face 51, a back face 52, and a top side 53, the front face 51 being provided with a display portion, the back face 52 being disposed opposite the front face 51, the top side 53 being located between the back face 52 and the front face 51.

In an embodiment, referring to fig. 20, in an embodiment, one of the sound emitting portions 503 is disposed at a junction between the front surface 51 and the top side surface 53, and the other sound emitting portion 503 is disposed at a junction between the back surface 52 and the top side surface 53. When one of the sound emitting parts 503 is arranged at the joint of the front surface 51 and the top side surface 53, the sound emitting part 503 and the ear coupling effect is good when a user is in a call, so that the user can clearly answer the sound emitted by the sound emitting part 503, and the call answering effect of the user is improved. The occupied space of the sound outlet part 503 on the front face 51 can be reduced, namely, the space of the sound outlet part 503 occupied by the front face 51 for setting the display part is reduced, the size of the display part is increased, and the full-screen mobile phone is realized. By arranging the other sound emitting portion 503 at the junction between the back surface 52 and the top surface 53, when the two sound emitting portions 503 are used as the external sound of the speaker, the matching effect of the two sound emitting portions 503 can be improved, and the volume of the external sound can be improved. The arrangement can achieve better call privacy protection function and loudspeaker play function. Of course, in other embodiments, the sound emitting portion 503 relatively closer to the front surface 51 may be disposed on the front surface 51, and the sound emitting portion 503 relatively closer to the back surface 52 may be disposed on the back surface 52 or the top side surface 53.

The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.

Claims

1. A sound emitting device, comprising:

a housing;

2. The sound generating device as claimed in claim 1, wherein the magnetic circuit system comprises two first center magnets and two second center magnets, the two first center magnets and the two second center magnets are alternately arranged in turn along the circumferential direction of the first diaphragm, the circumferential side of each first center magnet forms a first magnetic gap, the circumferential side of each second center magnet forms a second magnetic gap, the first vibration system is provided with a first voice coil corresponding to each first magnetic gap, and the second vibration system is provided with a second voice coil corresponding to each second magnetic gap;

3. The sound generating apparatus according to claim 2, wherein the first yoke plate includes a first supporting portion and a first connecting portion connecting the first supporting portion, the first connecting portion being connected to the housing, the first supporting portion extending in an arrangement direction of the two second center magnets, the two second center magnets being connected to the first supporting portion;

4. The sound generating apparatus according to claim 3, wherein the first connection portion is ring-shaped, one end of the first support portion is connected to one side of the first connection portion, the other end is connected to the other side of the first connection portion, and two opposite sides of the first support portion in the width direction are spaced from the first connection portion for the first voice coil to pass through; and/or the number of the groups of groups,

5. The sound generating apparatus according to claim 4, wherein the magnetic circuit further comprises two first side magnets, any one of the first side magnets being disposed at intervals on a side of the first center magnet facing away from the other first center magnet and being connected to the second supporting portion, and the first yoke plate further comprises a first side magnetic conductive plate connected to an inner side of the first connecting portion and to a side of the first side magnet facing away from the second supporting portion; and/or the number of the groups of groups,

6. The sound generating apparatus according to any one of claims 1 to 5, wherein the first diaphragm is a conductive diaphragm, and a first conductive layer is disposed on the first diaphragm to electrically connect the first voice coil and a first bonding pad on the housing; and/or the second vibrating diaphragm is a conductive vibrating diaphragm, and a second conductive layer is arranged on the second vibrating diaphragm and electrically connected with the second voice coil and a second bonding pad on the shell.

7. The sound generating apparatus of claim 6, wherein the first diaphragm includes a first ring-folded portion extending along a first annular axis, the first conductive layer includes a first conductive segment disposed on the first ring-folded portion, the first conductive segment is disposed in an arc perpendicular to the first annular axis, or the first conductive segment is disposed in a continuous bend, or the first conductive segment is disposed in an arc non-perpendicular to the first annular axis; and/or the number of the groups of groups,

8. The sound generating apparatus of claim 6, wherein the first conductive layer is printed or spray-formed on the first diaphragm; and/or, the second conductive layer is printed or sprayed on the second vibrating diaphragm;

and/or the first conductive layer comprises a first conductive circuit and two first conductive connecting parts which are respectively arranged at two ends of the first conductive circuit, the two first conductive connecting parts are respectively and electrically connected with the first voice coil and the first bonding pad, and a first insulating layer which covers the first conductive circuit is further arranged on the first vibrating diaphragm; and/or the second conductive layer comprises a second conductive circuit and two second conductive connecting parts which are respectively arranged at two ends of the second conductive circuit, the two second conductive connecting parts are respectively and electrically connected with the second voice coil and the second bonding pad, and a second insulating layer which covers the second conductive circuit is also arranged on the second vibrating diaphragm;

and/or, the first bonding pad and/or the second bonding pad are/is fixed on the shell in an injection molding way.

9. The sound generating apparatus of claim 6, wherein the material of the first conductive layer comprises any one or more of epoxy, polyester, and silicone mixed with conductive particles; and/or the material of the second conductive layer comprises any one or more of epoxy resin, polyester material and organic silicon mixed with conductive particles.

10. The sound generating apparatus according to any one of claims 1 to 5, wherein the first vibration system further comprises a first centering pad including a first annular connecting portion and two third support portions, the first annular connecting portion being connected to the housing, each of the third support portions being connected to one of the first voice coils; and/or, the second vibration system further comprises a second centering support piece, the second centering support piece comprises a second annular connecting part and two fourth supporting parts, the second annular connecting part is connected with the shell, and each fourth supporting part is connected with one second voice coil.

11. An electronic device comprising the sound emitting apparatus according to any one of claims 1 to 10; and