CN117459883A - Sound producing device and electronic equipment - Google Patents

Abstract

The invention discloses a sound generating device and electronic equipment, wherein the sound generating device comprises a first vibration unit, a second vibration unit and a magnetic circuit system, the first vibration unit comprises a first vibrating diaphragm, a second vibrating diaphragm, a first voice coil and a second voice coil, the first vibrating diaphragm is arranged on the periphery of the second vibrating diaphragm in a surrounding manner, the first voice coil is connected with the first vibrating diaphragm, and the first voice coil is arranged on the outer side of the second voice coil; the second vibration unit comprises a third vibration film, and the second voice coil is connected with the second vibration film and/or the third vibration film to drive the third vibration film and the second vibration film to vibrate in the same direction; the magnetic circuit system comprises a yoke plate, and a side magnetic part, an inner magnetic part and a center magnetic part which are arranged on the yoke plate at intervals from outside to inside, wherein a first magnetic gap for inserting a first voice coil is formed between the side magnetic part and the inner magnetic part, and a second magnetic gap for inserting a second voice coil is formed between the inner magnetic part and the center magnetic part; the second vibration unit is arranged on one side of the yoke plate, which is away from the side magnetic part. The technical scheme of the invention reduces the thickness of the sound generating device while realizing multifunctional application.

Description

Sound producing device and electronic equipment

Technical Field

The invention relates to the technical field of electroacoustic transduction, in particular to a sound generating device and electronic equipment.

Background

Currently, in order to make an electronic product (e.g., a mobile phone) in the related art have a better stereo effect when it is in a speaker mode and a better privacy protection effect when it is in a receiver mode. Generally, a single body with two sound produced on two sides is directly used in an audio system of an electronic product, so that two sound waves with the same phase are sent out to perform superposition enhancement to play a role in improving a stereo effect when a speaker mode is achieved, or two sound waves with opposite phases are sent out to perform offset attenuation based on a sound dipole effect to play a role in improving privacy protection when a receiver mode is achieved.

However, in the existing double-sided sound generating device, generally, each sound generating unit is respectively and correspondingly formed with a magnetic gap, and the two corresponding voice coils respectively extend into the two magnetic gaps to respectively drive the corresponding sound generating units to vibrate and generate sound. However, when the double-sided sound emitting device is arranged in such a way, the thickness of the double-sided sound emitting device is often 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 reduce the thickness of the sound generating device while realizing multifunctional application.

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

The first vibration unit comprises a first vibrating diaphragm, a second vibrating diaphragm, a first voice coil and a second voice coil, wherein the first vibrating diaphragm is arranged on the periphery of the second vibrating diaphragm in a surrounding mode, the periphery of the second vibrating diaphragm is connected with the inner periphery of the first vibrating diaphragm, the first voice coil is connected with the first vibrating diaphragm, and the first voice coil is arranged on the outer side of the second voice coil;

the second vibration unit comprises a third vibration film, the first vibration film, the second vibration film and the third vibration film are coaxially arranged, the third vibration film is opposite to and connected with the second vibration film, and the second voice coil is connected with the second vibration film and/or the third vibration film so as to drive the third vibration film and the second vibration film to vibrate in the same direction; and

the magnetic circuit system comprises a side magnetic part, an inner magnetic part, a central magnetic part and a yoke plate, wherein the yoke plate comprises a flat plate-shaped body part, the side magnetic part, the inner magnetic part and the central magnetic part are paved on the same side of the body part from outside to inside at intervals, a first magnetic gap for inserting the first voice coil is formed between the side magnetic part and the inner magnetic part, and a second magnetic gap for inserting the second voice coil is formed between the inner magnetic part and the central magnetic part;

The second vibration unit is arranged on one side of the yoke plate, which is away from the side magnetic part.

Optionally, the side magnetic part includes the side magnetic conduction board, the side magnetic conduction board with be equipped with annular installation department between the first vibrating diaphragm, the outer periphery of first vibrating diaphragm is fixed in annular installation department, annular installation department with side magnetic conduction board integrated into one piece or split type shaping.

Optionally, the inner magnetic part comprises an inner magnetic conductive plate, the central magnetic part comprises a central magnetic conductive plate, the first voice coil is inserted between the side magnetic conductive plate and the inner magnetic conductive plate, and the second voice coil is inserted between the inner magnetic conductive plate and the central magnetic conductive plate;

and/or the annular mounting part is formed at the outer edge of one side of the side magnetic conduction plate facing the first vibrating diaphragm.

Optionally, the second voice coil includes two flat voice coils, the axial direction of the flat voice coils is perpendicular to the vibration direction of the first vibration unit, the two flat voice coils are arranged on two opposite sides of the central magnetic part at intervals, the flat voice coils include two long sides which are oppositely arranged, one long side of the flat voice coils is connected with the second vibration film, and the other long side is connected with the third vibration film;

The yoke plate is provided with a through hole for avoiding the flat voice coil, the through hole forms a third magnetic gap, the long side connected with the second vibrating diaphragm is arranged in the second magnetic gap, and the long side connected with the third vibrating diaphragm stretches into the through hole.

Optionally, the second voice coil is coaxial with the first voice coil, the sound generating device still includes the connecting piece, the one end of second voice coil with one of second vibrating diaphragm with the third vibrating diaphragm is connected, the other end passes through the connecting piece with another one of second vibrating diaphragm and third vibrating diaphragm is connected, the yoke board has dodges the through-hole of connecting piece.

Optionally, a casing is disposed on a side of the yoke plate facing away from the first vibration unit, and an outer edge of the third diaphragm is fixed to the casing;

and/or the first vibrating diaphragm comprises a first folding ring part and an annular reinforcing part arranged on the first folding ring part, the second vibrating diaphragm comprises a second folding ring part and an inner reinforcing part arranged on the second folding ring part, the inner periphery of the annular reinforcing part is connected with the outer periphery of the second folding ring part, the outer periphery of the annular reinforcing part is connected with the inner periphery of the first folding ring part, and the first folding ring part and the second folding ring part are both arranged in a protruding way towards the magnetic circuit system;

And/or, the first vibrating diaphragm comprises a first folding ring part and an annular reinforcing part arranged on the first folding ring part, the second vibrating diaphragm comprises a second folding ring part and an inner reinforcing part arranged on the second folding ring part, the inner periphery of the annular reinforcing part is connected with the outer periphery of the second folding ring part, the outer periphery of the annular reinforcing part is connected with the inner periphery of the first folding ring part, the compliance of the second folding ring part is larger than that of the first folding ring part, the second vibrating diaphragm has a second effective radiation area Sd2, and the third vibrating diaphragm has a third effective radiation area Sd3, and Sd3/Sd2 is more than or equal to 0.95 and less than or equal to 1.05.

Optionally, the sound generating device further includes a conductive support piece, the conductive support piece includes a first conductive portion, a second conductive portion and an elastic conductive portion connected with the first conductive portion and the second conductive portion, the second conductive portion has a first electrical connection position, a middle conductive portion and a second electrical connection position which are sequentially connected, the second electrical connection position is electrically connected with the second voice coil, the first electrical connection position is electrically connected with the first voice coil, and the first conductive portion is used for connecting an external circuit.

Optionally, the conductive support piece is connected to one end of the first voice coil away from the first vibrating diaphragm, and the magnetic circuit system has an avoidance space for avoiding the conductive support piece.

Optionally, the inner magnetic parts include a plurality of inner magnetic parts, the plurality of inner magnetic parts are arranged on the periphery side of the central magnetic part at intervals, and a first avoiding space is formed by the intervals between adjacent inner magnetic parts; the side magnetic parts comprise a plurality of side magnetic parts which are arranged at intervals on the periphery side of the inner magnetic part, a second avoidance space is formed at intervals between adjacent side magnetic parts, the second avoidance space, the first magnetic gap, the first avoidance space and the second magnetic gap are mutually communicated,

the middle conductive part is arranged in the first avoidance space, and the elastic conductive part is arranged in the second avoidance space.

The invention also provides electronic equipment comprising the sounding device.

According to the technical scheme, the first vibration unit and the second vibration unit are respectively arranged on two opposite sides of the magnetic circuit system, the first vibration unit comprises the first vibrating diaphragm, the second vibrating diaphragm, the first voice coil and the second voice coil, the first vibrating diaphragm is arranged on the periphery of the second vibrating diaphragm in a surrounding mode, the periphery of the second vibrating diaphragm is connected with the inner periphery of the first vibrating diaphragm, the first voice coil is connected with the first vibrating diaphragm, the first voice coil is arranged on the outer side of the second voice coil, when the sounding device is used as a loudspeaker, the first vibrating diaphragm and the second vibrating diaphragm are used as a large vibrating diaphragm for sounding, and the electronic equipment has a good external effect; and, first vibrating diaphragm, second vibrating diaphragm and third vibrating diaphragm all coaxial setting, third vibrating diaphragm and second vibrating diaphragm are relative and be connected, and the second voice coil loudspeaker voice coil is connected in second vibrating diaphragm and/or third vibrating diaphragm to drive third vibrating diaphragm and second vibrating diaphragm syntropy vibration, make the TS parameter of second vibrating diaphragm and third vibrating diaphragm unanimous, thereby improve sound generating mechanism and apply the cancellation effect of second vibrating diaphragm and third vibrating diaphragm as the receiver, privacy protection effect when improving the user and talking. And the whole thickness of the magnetic circuit system can be reduced, the thickness of the sound generating device can be reduced, and the thin design of electronic equipment is facilitated.

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 a schematic view of an embodiment of a sound device according to the present invention;

FIG. 2 is a schematic view of the sound generating apparatus of FIG. 1 at another angle;

FIG. 3 is an exploded view of the sound emitting device of FIG. 1;

FIG. 4 is a side cross-sectional view of the sound emitting device of FIG. 1 taken at an angle;

FIG. 5 is a side cross-sectional view of the sound emitting device of FIG. 1 taken at another angle;

FIG. 6 is a schematic view of the interior of the sound emitting device of FIG. 1;

FIG. 7 is an exploded view of the magnetic circuit system of the sound emitting device of FIG. 1;

FIG. 8 is a schematic diagram of a conductive support in the sound device of FIG. 1;

FIG. 9 is an exploded view of another embodiment of a sound emitting device of the present invention;

FIG. 10 is a side cross-sectional view of the sound emitting device of FIG. 9 taken at an angle;

fig. 11 is a side cross-sectional view of the sound emitting device of fig. 9 taken at another angle.

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, in the embodiment of the present invention, directional indications such as up, down, left, right, front, and rear … … are referred to, and the directional indication is merely used to explain the relative positional relationship, movement conditions, and the like between the components in a specific posture such as that shown in the drawings, and if the specific posture is changed, the directional indication is changed accordingly.

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 100, wherein the sound generating device 100 is used for electronic equipment, and the electronic equipment can be terminal equipment such as a mobile phone, a tablet personal computer and the like.

As shown in fig. 1 to 11, the sound generating device 100 includes a magnetic circuit 110, a first vibration unit 120 and a second vibration unit 130, the magnetic circuit 110 is formed with a first magnetic gap 111 and a second magnetic gap 112, and the first magnetic gap 111 is located outside the second magnetic gap 112; the first vibration unit 120 includes a first diaphragm 121, a second diaphragm 122, a first voice coil 123, and a second voice coil 124, where the first diaphragm 121 is disposed around the second diaphragm 122, one side of the first voice coil 123 is inserted into the first magnetic gap 111, the other side is connected to the first diaphragm 121, and the second voice coil 124 is inserted into the second magnetic gap 112;

the second vibration unit 130 is disposed on a side of the magnetic circuit 110 away from the first vibration unit 120, the second vibration unit 130 includes a third diaphragm 131, the first diaphragm 121, the second diaphragm 122 and the third diaphragm 131 are coaxially disposed, the third diaphragm 131 and the second diaphragm 122 are opposite and connected, and the second voice coil 124 is connected to the second diaphragm 122 and/or the third diaphragm 131 and is configured to drive the third diaphragm 131 and the second diaphragm 122 to vibrate in the same direction.

Specifically, the first magnetic gap 111 may or may not be provided in an annular shape; similarly, the second magnetic gap 112 may or may not be annular, so the first magnetic gap 111 may be disposed outside the second magnetic gap 112 and only on opposite sides of the second magnetic gap 112; the first magnetic gap 111 may be provided around the outer periphery of the second magnetic gap 112. The second vibration unit 130 is disposed at a side of the magnetic circuit system 110 away from the first vibration unit 120, that is, the second vibration unit 130 is disposed opposite to the first vibration unit 120, and the first vibration unit 120 and the second vibration unit 130 share the magnetic circuit system 110, compared with the scheme that the first vibration unit 120 and the second vibration unit 130 respectively correspond to two magnetic circuit systems 110. The present solution reduces the number of magnetic circuit systems 110, which helps to reduce the thickness of the sound generating device 100.

The first magnetic gap 111 is disposed corresponding to the first diaphragm 121, and can be inserted by the first voice coil 123, and one side of the first voice coil 123 far away from the first magnetic gap 111 is connected to the first diaphragm 121, so as to drive the first diaphragm 121 to vibrate and sound. In this embodiment, the first voice coil 123 is configured as a ring-shaped voice coil, so as to reduce the overall thickness of the sound generating device 100. Of course, in other embodiments, the first voice coil 123 may also be configured as a flat voice coil.

The second magnetic gap 112 corresponds to the second diaphragm 122, and can be used for the second voice coil 124 to insert, the first diaphragm 121, the second diaphragm 122 and the third diaphragm 131 are all coaxially arranged, the third diaphragm 131 is opposite to and connected with the second diaphragm 122, so that the second diaphragm 122 and the third diaphragm 131 vibrate in the same direction, and the amplitudes are the same. When the second voice coil 124 is connected with the second diaphragm 122, the second voice coil 124 drives the second diaphragm 122 to vibrate and sound, and the second diaphragm 122 further drives the third diaphragm 131 to vibrate along with the second diaphragm in the same direction, so as to realize the same-direction vibration of the second diaphragm 122 and the third diaphragm 131; when the second voice coil 124 is connected with the third diaphragm 131, the second voice coil 124 drives the third diaphragm 131 to vibrate and sound, and the third diaphragm 131 drives the second diaphragm 122 to vibrate along with the third diaphragm in the same direction, so that the second diaphragm 122 and the third diaphragm 131 vibrate in the same direction; at this time, the second diaphragm 122 and the third diaphragm 131 may be connected by the connecting piece 125, so that when one of the two is driven to vibrate by the second voice coil 124, the other can also vibrate in the same direction; when the second voice coil 124 connects the second diaphragm 122 and the third diaphragm 131 at the same time, the second voice coil 124 can drive the second diaphragm 122 and the third diaphragm 131 to vibrate in the same direction at the same time. That is, the second diaphragm 122 and the third diaphragm 131 are driven by the same voice coil, compared with the second diaphragm 122 and the third diaphragm 131 which only share the magnetic circuit 110, but respectively drive the two voice coils, the scheme further improves the consistency of TS parameters of the second diaphragm 122 and the third diaphragm 131, thereby improving the counteracting effect of the second diaphragm 122 and the third diaphragm 131, and the scheme can reduce the overall thickness of the magnetic circuit 110, thereby being beneficial to reducing the thickness of the sound generating device 100.

In this embodiment, the sound generating apparatus 100 has a speaker mode and a receiver mode that are switched to each other;

in the speaker mode, the first voice coil 123 and the second voice coil 124 are energized;

in the receiver mode, the first voice coil 123 is powered off and the second voice coil 124 is powered on.

Specifically, during the speaker mode, the first voice coil 123 and the second voice coil 124 simultaneously load signals, so as to push the first diaphragm 121, the second diaphragm 122 and the third diaphragm 131 to vibrate in the same direction, and at this time, the first diaphragm 121 and the second diaphragm 122 serve as a large diaphragm to radiate sound waves, the third diaphragm 131 plays a role in balancing the air pressure of the vibration space, so as to ensure the vibration stability of the first diaphragm 121 and the second diaphragm 122, thereby ensuring the sound quality effect of the sound generating device 100 during the speaker mode, and ensuring the external playing effect of the electronic device. Preferably, the amplitudes of the first diaphragm 121, the second diaphragm 122, and the third diaphragm 131 are the same; in the receiver mode, the first voice coil 123 does not drive the first diaphragm 121 to vibrate, and only the second voice coil 124 drives the second diaphragm 122 and the third diaphragm 131 to vibrate in the same direction, because the third diaphragm 131 is opposite to and connected with the second diaphragm 122, when the second diaphragm 122 and the third diaphragm 131 vibrate in the same direction, the amplitude is the same, the phase is opposite, so that the cancellation effect of the second diaphragm 122 and the third diaphragm 131 is improved, the cancellation of far-field leakage sound is ensured, and the call privacy is improved.

In an embodiment, the outer periphery of the second diaphragm 122 and the inner periphery of the first diaphragm 121 are both fixed above the magnetic circuit 110 through a bracket. That is, the second diaphragm 122 is not directly connected with the first diaphragm 121, so that the vibration between the first diaphragm 121 and the second diaphragm 122 is not mutually affected, and when the receiver mode is reduced, the influence of the first diaphragm 121 on the vibration of the second diaphragm 122 is further improved, the cancellation effect of the second diaphragm 122 and the third diaphragm 131 is further improved, the cancellation of far-field leakage sound is ensured, and the call privacy is improved.

In another embodiment, referring to fig. 2 to 5 and 9 to 11, the outer periphery of the second diaphragm 122 is connected to the inner periphery of the first diaphragm 121. Namely, the first diaphragm 121 is configured as an annular diaphragm, and the first diaphragm 121 is directly connected with the second diaphragm 122, so that the first diaphragm 121 and the second diaphragm can be used as a large diaphragm to vibrate and sound, and can also be used as two small diaphragms to vibrate and sound respectively, thereby improving the flexibility of the sound generating device 100 and further improving the sound generating effect of the sound generating device 100. The first diaphragm 121 has a first ring portion 121a on an outer side thereof, the second diaphragm 122 has a second ring portion 122a on an outer side thereof, and the second ring portion 122a has a compliance greater than that of the first ring portion 121 a. Specifically, the greater the compliance, the greater its flexibility and the easier it is to deform. The second ring portion 122a has a greater compliance than the first ring portion 121a, so that the first ring portion 121a is less likely to move radially during vibration of the second diaphragm 122. And when in the receiver mode, the sound generating device 100 has low volume and small power, the vibration amplitude corresponding to the second vibration film 122 and the third vibration film 131 is small, and the vibration of the second vibration film 122 is less likely to drive the first vibration film 121 to vibrate, so that the first vibration film 121 is basically free from vibration or has extremely small vibration amplitude, and the silencing effect of the sound generating device 100 in the receiver mode is not affected.

Preferably, the compliance of the first collar portion 121a is greater than or equal to 1.5mm/N, and the compliance of the second collar portion 122a is greater than 2 times the compliance of the first collar portion 121 a. Specifically, if the compliance of the first ring portion 121a is less than 1.5mm/N, the compliance of the first diaphragm 121 is too small, which makes it difficult for the first diaphragm 121 to accommodate low-amplitude vibrations, and affects the sound production effect of the electronic device in the speaker mode. And the compliance of the second ring portion 122a is greater than 2 times that of the first ring portion 121a, so as to ensure that the compliance of the second ring portion 122a is sufficiently great, further reduce the driving of the second diaphragm 122 to the first diaphragm 121 by the vibration of the second diaphragm 122 in the receiver mode, and reduce the vibration interference of the first diaphragm 121 to the second diaphragm 122.

To ensure that the compliance of the second collar portion 122a is greater than the compliance of the first collar portion 121a, in one embodiment, the modulus of elasticity of the material of the first collar portion 121a is greater than the modulus of elasticity of the material of the second collar portion 122 a. Specifically, the greater the modulus of elasticity of the material, the greater the stiffness of the material, and the less the elastic deformation, and correspondingly, the less the flexibility and compliance of the material. The first and second ring portions 121a and 122a are made of different materials, and the elastic modulus of the material of the first ring portion 121a is greater than that of the material of the second ring portion 122a, so that the compliance of the second ring portion 122a is ensured to be greater than that of the first ring portion 121 a. The material of the first ring portion 121a and the second ring portion 122a may be one or more of PET, PEI, PEN, PEEK and the like.

In another embodiment, the aspect ratio of the turns of the second turn-around portion 122a is smaller than the aspect ratio of the turns of the first turn-around portion 121 a. That is, when the width of the ring of the second ring portion 122a is the same as that of the ring of the first ring portion 121a, the degree of concavity or convexity of the ring of the second ring portion 122a is greater than that of the ring of the first ring portion 121a, so as to improve the compliance of the second ring portion 122a, reduce the driving of the first diaphragm 121 by the vibration of the second diaphragm 122 in the receiver mode, and reduce the vibration interference of the first diaphragm 121 to the second diaphragm 122.

Further, the third diaphragm 131 includes a third ring portion 131a and a third reinforcing portion 131b provided on the third ring portion 131a, and the compliance of the third ring portion 131a is the same as that of the first ring portion 121 a. When the sound generating device is in the loudspeaker mode, the consistency of vibration of the third diaphragm 131 and the first diaphragm 121 is guaranteed, and the vibration interference of the third diaphragm 131 to the first diaphragm 121 is reduced. Optionally, the compliance of the second collar portion 122a is greater than the compliance of the third collar portion 131 a.

When the first diaphragm 121 is directly connected to the second diaphragm 122, in an embodiment, referring to fig. 2 to 5 and fig. 9 to 11 again, the first diaphragm 121 includes a first ring-shaped portion 121a and an annular reinforcing portion 121b disposed on the first ring-shaped portion 121a, the second diaphragm 122 includes a second ring-shaped portion 122a and an inner reinforcing portion 122b disposed on the second ring-shaped portion 122a, an inner periphery of the annular reinforcing portion 121b is connected to an outer periphery of the second ring-shaped portion 122a, an outer periphery of the annular reinforcing portion 121b is connected to an inner periphery of the first ring-shaped portion 121a, and the inner reinforcing portion 122b is disposed in an intermediate region of the second ring-shaped portion 122 a.

Specifically, the first collar portion 121a is formed at the outermost periphery for vibration deformation of the first diaphragm 121. The annular reinforcing portion 121b is used for adjusting the structural strength of the first diaphragm 121, and improving the sound production effect of the first diaphragm 121. Alternatively, the first voice coil 123 is connected to the annular reinforcing portion 121b, so as to drive the first diaphragm 121 to vibrate and sound, i.e. the outer periphery of the annular reinforcing portion 121b overlaps the inner periphery of the first collar portion 121a towards one side of the first voice coil 123. Further, the outer periphery of the second ring portion 122a is overlapped with the inner periphery of the annular reinforcement portion 121b, so as to connect the first diaphragm 121 and the second diaphragm 122, the second ring portion 122a is used for vibration deformation of the second diaphragm 122, and the inner periphery thereof is provided with the inner reinforcement portion 122b, so as to adjust the strength of the second diaphragm 122 and improve the vibration effect of the second diaphragm 122. Further alternatively, the second voice coil 124 is connected to the inner reinforcement portion 122b, so as to drive the second diaphragm 122 to vibrate and sound, i.e. the outer periphery of the inner reinforcement portion 122b overlaps the inner periphery of the second collar portion 122a towards one side of the second voice coil 124. And the first diaphragm 121 and the second diaphragm 122 are directly connected, and the inner reinforcement portion 122b and the annular reinforcement portion 121b are located in the same plane, which also contributes to the thickness reduction of the entire sound generating device 100.

Referring to fig. 4, 5, 10 and 11, in an embodiment, the first ring-folding portion 121a and the second ring-folding portion 122a are concavely disposed towards the magnetic circuit 110, so as to further reduce the overall thickness of the sound generating device 100. Of course, in other implementations, the first ring portion 121a and the second ring portion 122a may be both disposed in a protruding manner in a direction away from the magnetic circuit 110, or one of the first ring portion 121a and the second ring portion 122a may be disposed in a recessed manner toward the magnetic circuit 110, and the other may be disposed in a protruding manner in a direction away from the magnetic circuit 110, which is not limited herein.

To further ensure the sound producing effect of the sound producing device 100 in the speaker mode, in an embodiment, the outer dimension of the first vibration unit 120 is larger than the outer dimension of the second vibration unit 130. Specifically, the first effective radiation area of the first diaphragm 121 is defined as Sd1, the second effective radiation area of the second diaphragm 122 is defined as Sd2, and the third effective radiation area of the third diaphragm 131 is defined as Sd3, so that the outer dimension of the first vibration unit 120 is larger than that of the second vibration unit 130, which is more beneficial to setting that the sum of the effective radiation areas of the first diaphragm 121 and the second diaphragm 122 is larger than that of the third diaphragm 131, that is, sd 1+sd 2 > Sd3, so that the cancellation of the second vibration unit 130 to the first vibration unit 120 in the speaker mode is reduced, and the sounding effect of the electronic device in the speaker mode is improved.

Further, sd 3/(Sd2+Sd1) is less than or equal to 0.4. That is, the effective radiation area of the second vibration unit 130 is less than or equal to 40% of the effective radiation area of the first vibration unit 120, so that the effective radiation area of the second vibration unit 130 is further reduced, and when the speaker mode is further reduced, the second vibration unit 130 counteracts the first vibration unit 120, and the influence of the reverse sound wave of the sound generating device 100 is reduced, so that the sound generating effect of the sound generating device 100 in the speaker mode is ensured.

In another embodiment, 0.95.ltoreq.Sd3/Sd2.ltoreq.1.05. I.e. the second effective radiating area of the second diaphragm 122 is approximately equal to the third effective radiating area of the third diaphragm 131. In the receiver mode, the vibration of the first diaphragm 121 is extremely small and negligible, and the second diaphragm 122 and the third diaphragm 131 vibrate in the same direction, so that the effective area of the second diaphragm 122 is approximately equal to that of the third diaphragm 131, which is conducive to the formation of a perfect acoustic dipole between the second diaphragm 122 and the third diaphragm 131, thereby further improving the cancellation effect of the second diaphragm 122 and the third diaphragm 131 in the receiver mode. Preferably, the second effective radiating area of the second diaphragm 122 is equal to the third effective radiating area of the third diaphragm 131, so as to further help form a perfect acoustic dipole between the second diaphragm 122 and the third diaphragm 131, thereby further improving the cancellation effect of the second diaphragm 122 and the third diaphragm 131 in the receiver mode.

Referring to fig. 1 to 6, in an embodiment, the second voice coil 124 includes two flat voice coils 124a spaced apart from each other, the axial direction of the flat voice coils 124a is perpendicular to the vibration direction of the first vibration unit 120, one side of the flat voice coils 124a is fixed to the second diaphragm 122, and the other side is fixed to the third diaphragm 131 to drive the second diaphragm 122 and the third diaphragm 131 to vibrate in the same direction. Specifically, the axial direction of the flat voice coil 124a is perpendicular to the vibration direction of the first vibration unit 120, that is, the flat voice coil 124a is placed in the arrangement direction of the first vibration unit 120 and the second vibration unit 130, the size of the magnetic circuit portion for driving the flat voice coil 124a can be reduced, and thus the size of the sound generating apparatus 100 can be reduced. The two flat voice coils 124a are arranged at intervals and correspondingly inserted into the second magnetic gap 112, so that the second voice coil 124 is convenient to connect the second diaphragm 122 and the third diaphragm 131 at the same time, and the utilization rate of the magnetic circuit is improved. And the flat voice coil 124a is connected with the second diaphragm 122 and the third diaphragm 131 at the same time, that is, the flat voice coil 124a directly drives the second diaphragm 122 and the third diaphragm 131 to vibrate, so that a connecting piece 125 is not required to be additionally arranged to connect the second diaphragm 122 and the third diaphragm 131, which is helpful for simplifying the structure of the sound generating device 100, and can effectively ensure that the second diaphragm 122 and the third diaphragm 131 vibrate simultaneously and in the same direction. It will be appreciated that in this embodiment, the magnetic circuit 110 has a through hole that bypasses the flat voice coil 124 a.

The flat voice coil 124a includes two opposite long sides and two short sides connecting the two long sides, one long side of the flat voice coil 124a is connected to the second diaphragm 122, the other long side is connected to the third diaphragm 131, and the flat voice coil 124a is used for driving the second diaphragm 122 and the third diaphragm 131 to vibrate in the same direction. Specifically, the long side of the flat voice coil 124a is used for inserting the second magnetic gap 112, so that on one hand, the acting length of the flat voice coil 124a and the second magnetic gap 112 is increased, the magnetic field utilization rate is improved, and on the other hand, the connection length between the flat voice coil 124a and the second diaphragm 122 (the third diaphragm 131) is increased, so that the contact area between the flat voice coil 124a and the second diaphragm 122 (the third diaphragm 131) is increased, the uniformity and stability of the second diaphragm 122 (the third diaphragm 131) during vibration are improved, and the sounding effect of the sounding device 100 is improved.

Preferably, the flat voice coil 124a is bonded to the second diaphragm 122. The flat voice coil 124a and the second diaphragm 122 are conveniently fixed, and the mounting stability of the flat voice coil 124a and the second diaphragm is ensured. In another embodiment, the flat voice coil 124a is bonded to the third diaphragm 131. The flat voice coil 124a and the third diaphragm 131 are both conveniently fixed, and the mounting stability of the two is ensured.

Referring to fig. 1 to 2 and fig. 9 to 11, in another embodiment, the second voice coil 124 is disposed coaxially with the first voice coil 123, that is, the second voice coil 124 is configured as an annular voice coil, where the second voice coil 124 may be connected to only one of the second diaphragm 122 or the third diaphragm 131, and connected to the other through the connecting member 125 and drives the other diaphragm to vibrate.

In an embodiment, one end of the second voice coil 124 is connected to one of the second diaphragm 122 and the third diaphragm 131, and the other end is connected to the other of the second diaphragm 122 and the third diaphragm 131 through the connecting piece 125, so that the second voice coil 124 can drive the second diaphragm 122 and the third diaphragm 131 to vibrate in the same direction at the same time. The second voice coil 124 may be connected to the second diaphragm 122, where one side of the second voice coil 124 near the second diaphragm 122 is connected to the second diaphragm 122, the other side is connected to the connecting piece 125, and one side of the connecting piece 125 far from the second voice coil 124 is connected to the third diaphragm 131; or the second voice coil 124 is connected with the third diaphragm 131, at this time, one side of the second voice coil 124 close to the third diaphragm 131 is connected with the third diaphragm 131, the other side is connected with the connecting piece 125, and one side of the connecting piece 125 far away from the second voice coil 124 is connected with the second diaphragm 122. It will be appreciated that the magnetic circuit 110 is provided with a through hole for the bypass connector 125.

Further, the second voice coil 124 has two opposite long axis sides and a short axis side connecting the two long axis sides, the connection member 125 includes two, and the two connection members 125 are respectively connected with the two long axis sides. Specifically, the connecting piece 125 is connected to the long axis of the second voice coil 124 and extends along the extending direction of the long axis, so as to increase the connection length between the connecting piece 125 and the second voice coil 124, and further improve the stability of the connecting piece 125 and the second voice coil 124, and by taking the connection of the connecting piece 125 between the second voice coil 124 and the third diaphragm 131 as an example, the connection length between the connecting piece 125 and the long axis of the second voice coil 124 can also be increased, so as to increase the connection area between the second voice coil 124 and the third diaphragm 131, improve the uniformity and stability of the third diaphragm 131 during vibration, and further ensure that the TS parameters of the second diaphragm 122 and the third diaphragm 131 tend to be consistent.

Preferably, the second voice coil 124 is connected to the second diaphragm 122, and the connecting member 125 is connected between the second voice coil 124 and the third diaphragm 131, so as to facilitate the design and assembly of the magnetic circuit system 110. Optionally, the second voice coil 124, the second diaphragm 122, the connecting piece 125 and the third diaphragm 131 are bonded together, so that the connection stability can be ensured, and the operation is convenient.

Further, the connecting member 125 includes a main body section 125a extending along the arrangement direction of the second diaphragm 122 and the third diaphragm 131, and bending sections 125b disposed at two ends of the main body section 125a, wherein one of the two bending sections 125b is fixed to the second voice coil 124, and the other is fixed to the third diaphragm 131 or the second diaphragm 122. Specifically, the connecting piece 125 extends along the arrangement direction of the second diaphragm 122 and the third diaphragm 131 in the width direction, so that opposite sides of the connecting piece 125 in the width direction can be respectively abutted against the second voice coil 124 and the third diaphragm 131, and connection stability of the three is ensured. And in order to improve the stability of vibration of the third diaphragm 131, the connecting piece 125 includes a main body section 125a, and bending sections 125b disposed on two opposite sides of the main body section 125a, where the two bending sections 125b are respectively used to connect the second voice coil 124 and the third diaphragm 131, so as to increase the contact area between the second voice coil 124 and the connecting piece 125, and between the third diaphragm 131 and the connecting piece 125, and improve the stability of installation.

In the sound generating device 100 of the present application, the first magnetic gap 111 and the second magnetic gap 112 are disposed side by side in a direction perpendicular to the vibration direction of the first vibration unit 120, so that the first voice coil 123 and the second voice coil 124 are disposed side by side in a direction perpendicular to the vibration direction of the first vibration unit 120, the overall thickness of the magnetic circuit system 110 is reduced, and the overall thickness of the sound generating device 100 is further reduced.

In one embodiment, the magnetic circuit 110 includes a side magnetic part, an inner magnetic part, and a center magnetic part; the center magnetic part, the inner magnetic part and the side magnetic part are sequentially arranged from inside to outside, one side, close to the first vibration unit 120, of the inner magnetic part and the center magnetic part is provided with a first magnetic conduction plate which is integrally formed, one side, close to the second vibration unit 130, of the side magnetic part and the inner magnetic part is provided with a second magnetic conduction plate which is integrally formed, a first magnetic gap 111 is formed between the side magnetic part and the first magnetic conduction plate, and a second magnetic gap 112 is formed between the second magnetic conduction plate and the center magnetic part. Further, a side magnetic plate is arranged on one side of the side magnetic part, which is close to the first vibration unit 120, and a first magnetic gap 111 is formed between the side magnetic plate and the first magnetic plate; the central magnetic portion is provided with a central magnetic conductive plate on a side close to the second vibration unit 130, and a second magnetic gap 112 is formed between the central magnetic conductive plate and the second magnetic conductive plate. It will be appreciated that the first magnetically permeable plate has a through hole that bypasses the second voice coil 124.

Referring to fig. 3, 6 and 7, in another embodiment, the magnetic circuit 110 includes a side magnetic portion 113, an inner magnetic portion 114, a center magnetic portion 115 and a yoke plate 116;

the yoke plate 116 includes a flat plate-shaped main body 116a, the side magnetic portion 113, the inner magnetic portion 114, and the center magnetic portion 115 are disposed on the same side of the main body 116a from outside to inside at intervals, a first magnetic gap 111 is formed between the side magnetic portion 113 and the inner magnetic portion 114, and a second magnetic gap 112 is formed between the inner magnetic portion 114 and the center magnetic portion 115.

Specifically, the inner magnetic portion 114 is disposed at a distance outside the central magnetic portion 115, and a second magnetic gap 112 is formed between the inner magnetic portion 114 and the central magnetic portion 115, into which the second voice coil 124 is inserted. The side magnetic part 113 is provided outside the inner magnetic part 114 with a gap therebetween, and a first magnetic gap 111 is formed between the side magnetic part 113 and the inner magnetic part 114, into which the first voice coil 123 is inserted. The side magnetic part 113, the inner magnetic part 114 and the center magnetic part 115 are arranged on the same side of the main body part 116a of the yoke plate 116 at intervals, that is, the side magnetic part 113, the inner magnetic part 114 and the center magnetic part 115 are arranged in a non-laminated manner in the arrangement direction of the yoke plate 116. Compared with the structure that the side magnetic part 113 and/or the inner magnetic part 114 and/or the central magnetic part 115 are arranged on two opposite sides of the main body part 116a, the overall thickness of the magnetic circuit 110 can be reduced, and the overall thickness of the sound generating device 100 can be further reduced.

In this embodiment, the side magnetic part 113 includes a side magnet 113b provided on the yoke plate 116 and a side magnetic plate 113a provided on the side magnet 113b, the inner magnetic part 114 includes an inner magnet 114b provided on the yoke plate 116 and an inner magnetic plate 114a provided on the inner magnet 114b, the center magnetic part 115 includes a center magnet 115b provided on the yoke plate 116 and a center magnetic plate 115a provided on the center magnet 115b, a second magnetic gap 112 for inserting the second voice coil 124 is formed between the inner magnetic plate 114a and the center magnetic plate 115a, and a first magnetic gap 111 for inserting the first voice coil 123 is formed between the side magnetic plate 113a and the inner magnetic plate 114 a. Further, the side magnet 113b, the inner magnet 114b and the center magnet 115b are magnetized along the vibration direction of the first vibration unit 120, the magnetizing directions of the side magnet 113b and the inner magnet 114b are opposite, and the magnetizing directions of the side magnet 113b and the center magnet 115b are the same, so that when the first voice coil 123 is inserted into the first magnetic gap 111, and when the second voice coil 124 is inserted into the second magnetic gap 112, the cut magnetic induction lines vibrate in the same direction.

When the second voice coil 124 includes two flat voice coils 124a, the two flat voice coils 124a are correspondingly inserted into the second magnetic gap 112 and are located at two opposite sides of the central magnetic portion 115, and the two flat voice coils 124a are connected in series and have opposite current directions, so that the two flat voice coils 124a can move in the same direction when cutting the magnetic induction lines, and further drive the second diaphragm 122 and the third diaphragm 131 to vibrate in the same direction.

Referring again to fig. 3, 6 and 7, in one embodiment, the inner magnetic portion 114 includes a plurality of inner magnetic portions 114, and the plurality of inner magnetic portions 114 are disposed at intervals on the peripheral side of the central magnetic portion 115, and form a second magnetic gap 112 with the central magnetic portion 115, and the second voice coil 124 is inserted into the second magnetic gap 112. And when the second voice coil 124 is configured as the flat voice coil 124a, the second voice coil 124 includes two flat voice coils 124a, and the two flat voice coils 124a are inserted into the second magnetic gap 112 and located at opposite sides of the central magnetic portion 115. This ensures the vibration balance of the second diaphragm 122, avoiding polarization, etc. In other embodiments, the inner magnetic portion 114 may be configured as an annular magnetic portion, the central magnetic portion 115 is disposed at intervals inside the inner magnetic portion 114, and the second magnetic gap 112 is formed between the central magnetic portion 115 and the inner magnetic portion 114.

Preferably, the inner magnetic part 114 has four, four inner magnetic parts 114 are spaced apart from each other on the circumferential side of the central magnetic part 115, and a second magnetic gap 112 is formed between the four inner magnetic parts and the central magnetic part 115, and two flat voice coils 124a are inserted into the second magnetic gap 112 correspondingly and are located on opposite sides of the central magnetic part 115.

Accordingly, the side magnetic portion 113 includes a plurality of side magnetic portions 113, and the plurality of side magnetic portions 113 are provided at intervals on the circumferential side of the inner magnetic portion 114. Specifically, the side magnetic parts 113 include four side magnetic parts 113, which are surrounded on the outer periphery of the inner magnetic part 114 at intervals, and the arrangement axes of the side magnetic parts 113 and the arrangement axes of the inner magnetic part 114 are overlapped, and a first magnetic gap 111 is formed between the inner magnetic part 114 and the side magnetic part 113; or the side magnetic part 113 is configured as an annular magnetic part, the side magnetic part 113 is sleeved on the outer periphery of the inner magnetic part 114 at intervals, and a first magnetic gap 111 is formed between the inner magnetic part 114 and the side magnetic part 113.

Further, the central magnetic portion 115 is configured as a cuboid, the central magnetic portion 115 has a first side and a second side that are adjacently disposed, the length of the first side is greater than that of the second side, and the flat voice coil 124a is disposed corresponding to the first side, so that the effective acting length of the central magnetic portion 115 is increased, and the magnetic circuit utilization rate can also be increased.

Referring to fig. 2 to 5 and 9 to 11, in the present embodiment, the inner magnetic portion 114 includes an inner magnetic conductive plate 114a, the central magnetic portion 115 includes a central magnetic conductive plate 115a, the side magnetic portion 113 includes an inner magnetic conductive plate 113a, specifically, the inner magnetic portion 114 includes an inner magnetic body 114b and an inner magnetic conductive plate 114a disposed on a side of the inner magnetic body 114b facing away from the yoke plate 116, the central magnetic portion 115 includes a central magnetic body 115b and a central magnetic conductive plate 115a disposed on a side of the central magnetic body 115b facing away from the yoke plate 116, the side magnetic portion 113 includes a side magnetic body 113b and a side magnetic conductive plate 113a disposed on a side of the side magnetic body 113b facing away from the yoke plate 116, that is, the side magnetic bodies 113b and the central magnetic body 115b are configured as a plurality of plates, the side magnetic bodies 113b are fixedly connected to the side magnetic conductive plate 113a, the inner magnetic body 114b is fixedly connected to the inner magnetic conductive plate 114a, and the central magnetic body 115b is fixedly connected to the central magnetic conductive plate 115a, thereby ensuring the installation stability of the magnetic conductive plates. The inner magnetic conductive plate 114a, the center magnetic conductive plate 115a and the side magnetic conductive plates 113a all play a role of magnetic focusing, so that more magnetic induction lines are focused in the corresponding magnetic gaps. In other embodiments, the inner magnetic conductive plate 114a and the central magnetic conductive plate 115a may be configured as a monolithic magnetic conductive plate, and the inner magnet 114b is used to connect and fix the yoke plate 116, and a first magnetic gap 111 is formed between the magnetic conductive plate and the side magnetic conductive plate 113a, and a through hole 117 for avoiding the second voice coil 124 is formed in the magnetic conductive plate; the yoke plate 116 is configured in a split structure at this time, and includes a first yoke plate provided to the center magnet 115b and a second yoke plate provided to both the inner magnet 114b and the side magnet 113b, with a second magnetic gap 112 formed therebetween.

In one embodiment, when the second voice coil 124 is coaxial with the first voice coil 123, the first voice coil 123 is interposed between the side magnetic conductive plate 113a and the inner magnetic conductive plate 114a, that is, the first voice coil 123 is interposed between the side magnetic conductive plate 113a and the inner magnetic conductive plate 114a by the first magnetic gap 111. When the second voice coil 124 is connected to the second diaphragm 122, the second voice coil 124 is inserted between the inner magnetic conductive plate 114a and the central magnetic conductive plate 115a, one side of the connecting member 125 is connected to the second voice coil 124, the other side passes through the yoke plate 116 to connect to the third diaphragm 131, and the yoke plate 116 is provided with a through hole 117 for avoiding the connecting member 125. Or, the second voice coil 124 is connected to the third diaphragm 131, one side of the connecting piece 125 is connected to the second voice coil 124, the other side is connected to the second diaphragm 122, and a through hole for the connecting piece 125 to pass through is provided between the inner magnetic conductive plate 114a and the central magnetic conductive plate 115 a.

In one embodiment, when the second voice coil 124 is configured as two flat voice coils 124a, the yoke plate 116 is provided with a through hole 117 through which the flat voice coil 124a passes, and the through hole 117 forms a third magnetic gap. The flat voice coil 124a includes two oppositely disposed long sides and two short sides connecting the two long sides, one long side being connected to the second diaphragm 122 and interposed between the inner magnetic conductive plate 114a and the center magnetic conductive plate 115a, i.e., interposed between the second magnetic gap 112, and the other long side being connected to the third diaphragm 131 and interposed between the through hole 117, i.e., interposed between the third magnetic gap.

To facilitate the installation of the third diaphragm 131, a housing 119 is provided on a side of the magnetic circuit 110 facing away from the first vibration unit 120, and an outer edge of the third diaphragm 131 is fixed to the housing 119. The housing 119 may be a plastic material or the like.

To facilitate the installation of the first vibration unit 120, the magnetic circuit system 110 further includes an annular mounting portion 118, and the outer periphery of the first diaphragm 121 is fixed to the annular mounting portion 118, and the annular mounting portion 118 and the magnetic circuit system 110 are integrally formed or separately formed. Specifically, the annular mounting portion 118 may be formed by bending and extending the outer edge of the side magnetic conductive plate 113a of the magnetic circuit 110 toward one side of the first vibration unit 120, or the annular mounting portion 118 may be an annular bracket provided on the outer edge of the side magnetic conductive plate 113a of the magnetic circuit 110.

Further, the outer peripheral edge of the first diaphragm 121 is adhered to the annular mounting portion 118. Thereby not only facilitating the installation of the first diaphragm 121, but also ensuring the installation stability of the first diaphragm 121, and further ensuring the installation stability of the first diaphragm 121, the outer periphery of the first diaphragm 121 is coated on the annular installation portion 118.

Referring to fig. 1 to 11, in order to facilitate connection of the first voice coil 123 and the second voice coil 124 to an external circuit, the magnetic circuit 110 is provided with a conductive support piece 140, and the magnetic circuit 110 has an avoidance space for avoiding the conductive support piece 140. Specifically, the conductive support piece 140 is used for connecting the first voice coil 123 and the second voice coil 124 to an external circuit.

Referring to fig. 6, the inner magnetic part 114 includes a plurality of inner magnetic parts 114, and the plurality of inner magnetic parts 114 are spaced apart from each other on the circumferential side of the central magnetic part 115, and the space between adjacent inner magnetic parts 114 forms a first escape space 150; the side magnetic parts 113 comprise a plurality of side magnetic parts 113, the side magnetic parts 113 are arranged on the periphery side of the inner magnetic part 114 at intervals, a second avoiding space 151 is formed at intervals between the adjacent side magnetic parts 113, and the second avoiding space 151, the first magnetic gap 111, the first avoiding space 150 and the second magnetic gap 112 are mutually communicated for placing the conductive support sheet 140. Preferably, the conductive support 140 is connected to an end of the first voice coil 123 away from the first diaphragm 121.

Referring to fig. 9, when the first voice coil 123 and the second voice coil 124 are both configured as annular voice coils and are coaxially disposed, in one embodiment, the conductive support pieces 140 include four, and the four conductive support pieces 140 are disposed at intervals at the corners of the sound generating device 100. Alternatively, two conductive tabs 140 of the four conductive tabs 140 electrically connect the first voice coil 123 and the external circuit, and the other two conductive tabs 140 electrically connect the second voice coil 124 and the external circuit.

Referring to fig. 3 and 8, when the second voice coil 124 includes two flat voice coils 124a, the conductive tab 140 includes a first conductive portion 141, a second conductive portion 142, and an elastic conductive portion 143 connecting the first conductive portion 141 and the second conductive portion 142, the second conductive portion 142 has a first electrical connection site 142a, an intermediate conductive portion 142b, and a second electrical connection site 142c connected in sequence, the second electrical connection site 142c is electrically connected to the second voice coil 124, the first electrical connection site 142a is electrically connected to the first voice coil 123, and the first conductive portion 141 is used for connecting an external circuit. Specifically, the first conductive part 141 is used to connect with an external circuit, the elastic conductive part 143 is used to connect the first conductive part 141 and the second conductive part 142, and the second conductive part 142 is used to connect the first voice coil 123 and the second voice coil 124, thereby realizing connection of the first voice coil 123 with the external circuit, and connection of the second voice coil 124 with the external circuit. The middle conductive portion 142b is disposed in the first avoidance space 150, and the elastic conductive portion 143 is disposed in the second avoidance space 151. The second electrical connection location 142c is formed with a clamping groove, and the two flat voice coils 124a are clamped in the clamping groove.

The invention also provides an electronic device, which comprises the sound generating device 100, and the specific structure of the sound generating device 100 refers to the above embodiment, and because the electronic device adopts all the technical solutions of all the embodiments, at least has all the beneficial effects brought by the technical solutions of the embodiments, and the details are not repeated here.

The foregoing description of the preferred embodiments of the present invention should not be construed as limiting the scope of the invention, but rather should be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the following description and drawings or any application directly or indirectly to other relevant art(s).

Claims (10)

1. A sound emitting device, comprising:

the first vibration unit comprises a first vibrating diaphragm, a second vibrating diaphragm, a first voice coil and a second voice coil, wherein the first vibrating diaphragm is arranged on the periphery of the second vibrating diaphragm in a surrounding mode, the periphery of the second vibrating diaphragm is connected with the inner periphery of the first vibrating diaphragm, the first voice coil is connected with the first vibrating diaphragm, and the first voice coil is arranged on the outer side of the second voice coil;

the second vibration unit comprises a third vibration film, the first vibration film, the second vibration film and the third vibration film are coaxially arranged, the third vibration film is opposite to and connected with the second vibration film, and the second voice coil is connected with the second vibration film and/or the third vibration film so as to drive the third vibration film and the second vibration film to vibrate in the same direction; and

The magnetic circuit system comprises a side magnetic part, an inner magnetic part, a central magnetic part and a yoke plate, wherein the yoke plate comprises a flat plate-shaped body part, the side magnetic part, the inner magnetic part and the central magnetic part are paved on the same side of the body part from outside to inside at intervals, a first magnetic gap for inserting the first voice coil is formed between the side magnetic part and the inner magnetic part, and a second magnetic gap for inserting the second voice coil is formed between the inner magnetic part and the central magnetic part;

the second vibration unit is arranged on one side of the yoke plate, which is away from the side magnetic part.

2. The sound generating apparatus of claim 1, wherein the side magnetic part comprises a side magnetic plate, an annular mounting part is arranged between the side magnetic plate and the first diaphragm, the outer periphery of the first diaphragm is fixed on the annular mounting part, and the annular mounting part and the side magnetic plate are integrally formed or formed separately.

3. The sound generating apparatus of claim 2, wherein the inner magnetic portion comprises an inner magnetic plate, the center magnetic portion comprises a center magnetic plate, the first voice coil is interposed between the side magnetic plate and the inner magnetic plate, and the second voice coil is interposed between the inner magnetic plate and the center magnetic plate;

And/or the annular mounting part is formed at the outer edge of one side of the side magnetic conduction plate facing the first vibrating diaphragm.

4. The sound generating apparatus according to claim 1, wherein the second voice coil comprises two flat voice coils, an axial direction of the flat voice coils is perpendicular to a vibration direction of the first vibration unit, the two flat voice coils are arranged on opposite sides of the central magnetic portion at intervals, the flat voice coils comprise two opposite long sides, one long side of the flat voice coils is connected with the second diaphragm, and the other long side is connected with the third diaphragm;

the yoke plate is provided with a through hole for avoiding the flat voice coil, the through hole forms a third magnetic gap, the long side connected with the second vibrating diaphragm is arranged in the second magnetic gap, and the long side connected with the third vibrating diaphragm stretches into the through hole.

5. The sound generating apparatus according to claim 1, wherein the second voice coil is coaxially disposed with the first voice coil, the sound generating apparatus further comprises a connecting member, one end of the second voice coil is connected to one of the second diaphragm and the third diaphragm, the other end is connected to the other of the second diaphragm and the third diaphragm through the connecting member, and the yoke plate has a through hole for avoiding the connecting member.

6. The sound generating apparatus according to claim 1, wherein a housing is provided on a side of the yoke plate facing away from the first vibration unit, and an outer edge of the third diaphragm is fixed to the housing;

and/or the first vibrating diaphragm comprises a first folding ring part and an annular reinforcing part arranged on the first folding ring part, the second vibrating diaphragm comprises a second folding ring part and an inner reinforcing part arranged on the second folding ring part, the inner periphery of the annular reinforcing part is connected with the outer periphery of the second folding ring part, the outer periphery of the annular reinforcing part is connected with the inner periphery of the first folding ring part, and the first folding ring part and the second folding ring part are both arranged in a protruding way towards the magnetic circuit system;

and/or, the first vibrating diaphragm comprises a first folding ring part and an annular reinforcing part arranged on the first folding ring part, the second vibrating diaphragm comprises a second folding ring part and an inner reinforcing part arranged on the second folding ring part, the inner periphery of the annular reinforcing part is connected with the outer periphery of the second folding ring part, the outer periphery of the annular reinforcing part is connected with the inner periphery of the first folding ring part, the compliance of the second folding ring part is larger than that of the first folding ring part, the second vibrating diaphragm has a second effective radiation area Sd2, and the third vibrating diaphragm has a third effective radiation area Sd3, and Sd3/Sd2 is more than or equal to 0.95 and less than or equal to 1.05.

7. The sound generating apparatus of claim 4, further comprising a conductive tab comprising a first conductive portion, a second conductive portion, and an elastic conductive portion connecting the first conductive portion and the second conductive portion, the second conductive portion having a first electrical connection location, a middle conductive portion, and a second electrical connection location connected in sequence, the first electrical connection location electrically connecting the first voice coil, the second electrical connection location electrically connecting the second voice coil, the first conductive portion for connecting an external circuit.

8. The sound generating apparatus as recited in claim 7, wherein the conductive support is connected to an end of the first voice coil away from the first diaphragm, and the magnetic circuit has a space for avoiding the conductive support.

9. The sound generating apparatus according to claim 8, wherein the inner magnetic portion includes a plurality of inner magnetic portions, the plurality of inner magnetic portions being provided at intervals on a peripheral side of the central magnetic portion, the intervals between adjacent inner magnetic portions forming first avoiding spaces; the side magnetic parts comprise a plurality of side magnetic parts which are arranged at intervals on the periphery side of the inner magnetic part, a second avoidance space is formed at intervals between adjacent side magnetic parts, the second avoidance space, the first magnetic gap, the first avoidance space and the second magnetic gap are mutually communicated,

The middle conductive part is arranged in the first avoidance space, and the elastic conductive part is arranged in the second avoidance space.

10. An electronic device comprising the sound emitting apparatus according to any one of claims 1 to 9.