Electronic device

Abstract

The present invention relates to the technical field of electro-acoustic conversion, and provides an electronic device. The electronic device comprises a housing and a first sound production device and a second sound production device which are accommodated in the housing; the first sound production device comprises a frame, a vibration system, and a magnetic circuit system; the vibration system comprises a diaphragm and a voice coil; the magnetic circuit system comprises a magnetic yoke, a steel magnet unit, and secondary steel magnets; the voice coil is inserted into a magnetic gap; the first sound production device further comprises an upper shell fixed to the side of the frame close to the vibration system, wherein the upper shell and the diaphragm define a front cavity for sound output; the first sound production device further comprises a first elastic damping member, wherein the first elastic damping member is connected to the magnetic yoke and the frame so as to support the vibration of the magnetic circuit system; the diaphragm, the magnetic yoke, the frame, and the first elastic damping member sealingly define a first rear cavity; and the first sound production device, the second sound production device, and the housing define a second rear cavity. Compared with the related art, the sound production devices of the present invention have a good vibration damping effect, high frequency response sensitivity, and better acoustic performance.

Description

Electronic device TECHNICAL FIELD

[0001] The present application relates to the field of electro-acoustic conversion, and in particular to an electronic device. BACKGROUND

[0002] With the rapid development of science and technology, electronic devices (such as tablets and smart phones) are increasingly favored by users due to their lightness, thinness, portability and other characteristics. Users can use electronic devices to listen to music, watch videos, etc. Most of the current portable electronic devices have one sound emitting device, and the sound emitting device is generally arranged on the side or back of the portable electronic device. The sound emitting device is mainly used to convert electrical signals into sound signals. TECHNICAL PROBLEM

[0003] The sound emitting device of the related art electronic device includes a basket, a vibration system fixed to the basket, and a magnetic circuit system having a magnetic gap, the vibration system including a diaphragm fixed to the basket for vibrating sound emission and a voice coil inserted into the magnetic gap to drive the diaphragm to vibrate, to improve the acoustic performance of the sound emitting device.

[0004] However, in the related art electronic device, in order to balance the performance and space of the sound emitting device, one sound emitting device plus one two-in-one are often designed, where the two-in-one is a sound emitting device monomer, designed as an open cavity or a closed cavity, to balance the sound emitting and receiver functions. When the two-in-one is designed as an open cavity, the internal space of the terminal device serves as the back cavity of the two-in-one monomer. When used for sound emission, the internal pressure of the terminal device is relatively large near the modal frequency of the mobile phone or when the excitation voltage is relatively large, resulting in serious shell vibration.

[0005] Therefore, it is necessary to provide a new electronic device to solve the above problems. TECHNICAL SOLUTION

[0006] The technical problem to be solved by the present application is to provide an electronic device with good vibration reduction effect, high frequency response sensitivity, and better acoustic performance.

[0007] To solve the above technical problems, the present application provides an electronic device, which comprises a shell and a first sound emitting device and a second sound emitting device accommodated in the shell and fixed to the shell and arranged apart from each other.

[0008] The first sound generating device comprises a frame, a vibration system fixed to the frame, and a magnetic circuit system driving the vibration system to vibrate; the vibration system comprises a diaphragm fixed to the frame and a voice coil driving the diaphragm to vibrate and generate sound; the magnetic circuit system comprises a magnetic bowl fixed to the frame, a magnetic unit fixed to the magnetic bowl near the vibration system, and a secondary magnetic steel spaced from the magnetic unit, the magnetic unit and the secondary magnetic steel being spaced to form a magnetic gap; the voice coil is inserted into the magnetic gap.

[0009] The first sound generating device further comprises an upper shell fixed to the frame near the vibration system, the upper shell and the diaphragm forming a front cavity for sound output; the first sound generating device further comprises a first elastic damping member connecting the magnetic bowl and the frame to support the magnetic circuit system to vibrate, the diaphragm, the magnetic bowl, the frame, and the first elastic damping member being sealed to form a first rear cavity; the first sound generating device, the second sound generating device, and the shell form a second rear cavity.

[0010] Preferably, the first elastic damping member comprises a first fixed part in the form of a ring fixed to the frame away from the vibration system, an elastic part bent and extended from the first fixed part to the side near the magnetic unit, and a second fixed part extended from the elastic part to the side near the magnetic unit, the second fixed part being fixed to the outer periphery of the magnetic bowl.

[0011] Preferably, the cross section of the elastic part along the vibration direction of the vibration system is in the form of S, W, or C.

[0012] Preferably, the first elastic damping member is made of single-element damping material, high-molecular damping material, or metal composite damping structure material.

[0013] Preferably, the first sound generating device further comprises a mass fixed to the magnetic bowl away from the vibration system.

[0014] Preferably, the magnetic unit is provided with a through hole formed through along the vibration direction of the vibration system.

[0015] The first sound generating device further comprises a non-magnetic connecting member fixed to the diaphragm near the magnetic circuit system, and a magnet assembly fixed to the non-magnetic connecting member near the magnetic circuit system, the non-magnetic connecting member and the magnet assembly being suspended in the through hole.

[0016] Preferably, the first sound generating device further comprises a soft iron assembly in the form of a hollow structure located in the through hole and fixed to the magnetic bowl, the magnet assembly being suspended in the hollow structure and spaced from the soft iron assembly.

[0017] Preferably, the soft iron assembly comprises a first soft iron layer fixed on the side of the magnetic bowl close to the vibration system, a first plastic layer fixed on the first soft iron layer, and a second soft iron layer fixed on the first plastic layer.

[0018] Preferably, the soft iron assembly further comprises a second plastic layer fixed between the first soft iron layer and the magnetic bowl.

[0019] Preferably, the electronic device further comprises a second elastic damping member arranged oppositely, and the first sound generating device is elastically supported on the shell through the second elastic damping member.

[0020] Preferably, the first sound generating device further comprises a third elastic damping member fixed on the diaphragm on the side close to the vibration system, and the third elastic damping member connects the yoke and the auxiliary magnetic steel. Advantages

[0021] Compared with the prior art, in the electronic device, the first sound generating device and the second sound generating device are fixed on the shell and arranged at a distance from each other, wherein the first sound generating device further comprises an upper shell fixed on the yoke on the side close to the vibration system, and the upper shell and the diaphragm form a front cavity for sound output; the first sound generating device further comprises a first elastic damping member connecting the magnetic bowl and the yoke to support the vibration of the magnetic circuit system; the diaphragm, the magnetic bowl, the yoke, and the first elastic damping member are sealed to form a first rear cavity; the first sound generating device, the second sound generating device, and the shell form a second rear cavity; the vibration of the magnetic circuit system and the vibration of the vibration system form two suspension systems together, and the interaction force and the direction of the force are opposite, so that when the loudspeaker is connected to the terminal device for use, the stress is reduced, and a certain damping effect is achieved, thereby avoiding the shell vibration problem. In addition, when the first sound generating device and the second sound generating device sound, the first sound generating device and the second sound generating device are opposite to the internal pressure of the mobile phone, which can significantly reduce the internal pressure of the electronic device cavity in the frequency band where the shell vibration is obvious, and further achieve the effect of reducing the shell vibration. At the same time, the structure of the first sound generating device can increase the low-frequency sensitivity of the second sound generating device, and further improve the acoustic performance of the sound generating device. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings, wherein:

[0023] Fig. 1 is a schematic diagram of an overall exploded structure of an embodiment of the electronic device of the present application;

[0024] Fig. 2 is a schematic diagram of a structure of the first sound emitting device of the embodiment of the present application;

[0025] Fig. 3 is a schematic diagram of an exploded structure of Fig. 2;

[0026] Fig. 4 is a sectional view along line A-A of Fig. 2;

[0027] Fig. 5 is a sectional view along line B-B of Fig. 2;

[0028] Fig. 6 is a schematic diagram of a three-dimensional structure of the first sound emitting device of the second embodiment of the present application;

[0029] Fig. 7 is a schematic diagram of an overall exploded structure of the first sound emitting device of the second embodiment of the present application;

[0030] Fig. 8 is a sectional view along line C-C of Fig. 6;

[0031] Fig. 9 is a sensitivity SPL curve diagram of the present application and a conventional structure;

[0032] Fig. 10 is a sensitivity SPL curve diagram of the present application and a conventional structure;

[0033] Fig. 11 is a diagram of internal pressure curves of the present application and a conventional structure applied to a mobile phone;

[0034] Fig. 12 is an enlarged view of D of Fig. 8;

[0035] Fig. 13 is a schematic diagram of an internal structure of an embodiment of the electronic device of the present application;

[0036] Fig. 14 is a schematic diagram of an internal structure of the first sound emitting device of the fourth embodiment of the present application. Embodiments of the present application

[0037] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0038] Embodiment one

[0039] Referring to Figs. 1-12, an electronic device 1000 is provided, which comprises a housing 300, and a first sound emitting device 100 and a second sound emitting device 200 received in the housing 300, fixed to the housing 300 and arranged apart from each other.

[0040] The shell 300 comprises a bottom shell 301 and an upper cover 302 fixed to the bottom shell 301, the second sound generating device 200 is fixed to the bottom shell 301, and the first sound generating device 100 is fixed to the bottom shell 301 and arranged in a spaced manner with the second sound generating device 200.

[0041] The first sound generating device 100 comprises a yoke 1, a vibration system 2 fixed to the yoke 1, and a magnetic circuit system 3 driving the vibration system 2 to vibrate.

[0042] Specifically, the yoke 1 is used to support and fix the vibration system 2 and the magnetic circuit system 3.

[0043] The vibration system 2 comprises a diaphragm 21 fixed to the yoke 1 and a voice coil 22 driving the diaphragm 21 to vibrate and generate sound.

[0044] In this embodiment, the diaphragm 21 comprises a vibrating part 211 in a ring shape, a folded ring 212 part extending from the outer periphery of the vibrating part 211 to the side close to the yoke 1, a second fixing part 213 extending from the outer periphery of the folded ring 212 part to the side close to the yoke 1, and a ball top 214 fixed to the vibrating part 211, the second fixing part 213 is fixed to the yoke 1 at the side close to the yoke 1, and the voice coil 22 is fixed to the vibrating part 211 at the side close to the magnetic circuit system 3.

[0045] The vibration system 2 further comprises a skeleton 23, the outer periphery of the skeleton 23 is fixed to the yoke 1, the side of the skeleton 23 close to the vibration system 2 is fixed to the vibrating part 211, and the side of the skeleton 23 away from the vibration system 2 is fixed to the voice coil 22. Optionally, the skeleton 23 can also be a PFC circuit board, and the skeleton 23 is electrically connected with the voice coil 22.

[0046] In this embodiment, the magnetic circuit system 3 comprises a magnetic bowl 33 fixed to the yoke 1, a magnetic steel unit 31 fixed to the side of the magnetic bowl 33 close to the vibration system 2, and a secondary magnetic steel 32 spaced from the magnetic steel unit 31, the magnetic steel unit 31 and the secondary magnetic steel 32 are spaced to form a magnetic gap 34, and the voice coil 22 is inserted into the magnetic gap 34.

[0047] Specifically, the magnetic steel unit 31 comprises a main magnetic steel 311 fixed to the magnetic bowl 33 and a pole core 312 fixed to the side of the main magnetic steel 311 close to the vibration system 2, and the secondary magnetic steel 32 is arranged around the main magnetic steel 311 to form the magnetic gap 34.

[0048] The first sound generating device 100 further comprises an upper shell 12 fixed to the yoke 1 near one side of the vibration system 2, and the upper shell 12 and the diaphragm 21 form a front cavity 15 for sound output.

[0049] The first sound generating device 100 further comprises a first elastic damping member 5 connected to the magnetic bowl 33 and the yoke 1 to support the vibration of the magnetic circuit system 3, and the diaphragm 21, the magnetic bowl 33, the yoke 1 and the first elastic damping member 5 form a first rear cavity 13 in a sealed manner, and the first sound generating device 100, the second sound generating device 200 and the shell 300 form a second rear cavity 14 in a sealed manner. The first elastic damping member 5 is fixed to the outer periphery of the magnetic bowl 33 near the magnetic circuit system 3, and the first elastic damping member 5 is fixed to the inner periphery of the yoke 1 away from the magnetic circuit system 3, so as to elastically connect the magnetic circuit system 3 to the yoke 1.

[0050] Specifically, the upper shell 12 and the diaphragm 21 form a front cavity 15 for sound output. The diaphragm 21, the magnetic bowl 33, the yoke 1 and the first elastic damping member 5 form a first rear cavity 13 in a sealed manner, and the first sound generating device 100, the second sound generating device 200 and the shell 300 form a second rear cavity 14 in a sealed manner. The vibration of the magnetic circuit system and the vibration of the vibration system form two suspension systems together, and the forces are opposite in direction, so that the force on the loudspeaker connected to the terminal device is reduced when the terminal device is used, and a certain damping effect is achieved, thereby avoiding the problem of shell vibration. In addition, when the first sound generating device and the second sound generating device generate sound, the first sound generating device and the second sound generating device are opposite in phase to the internal pressure of the mobile phone, which can significantly reduce the internal pressure of the electronic device in the frequency band where the shell vibration is obvious, and further achieve the effect of reducing the shell vibration. At the same time, the structure of the first sound generating device can increase the low-frequency sensitivity of the second sound generating device, and further improve the acoustic performance of the sound generating device.

[0051] In the embodiment, the yoke 1 further extends to form an extension wall 8 with a cavity structure on both sides, and the extension wall 8 is fixed to the first elastic damping member 5 near the magnetic circuit system 3. The extension wall 8 expands the rear cavity volume of the first sound generating device 100, which facilitates to improve the acoustic performance of the sound generating device.

[0052] The first elastic damping member 5 includes a first fixed part 51 fixed to the yoke 1 away from the vibration system 2, an elastic part 52 formed by bending the first fixed part 51 to extend towards the magnetic circuit system 3, and a second fixed part 53 formed by extending the elastic part 52 towards the magnetic circuit system 3, and the second fixed part 53 is fixed to the outer periphery of the magnetic bowl 33. The first fixed part 51 is fixed to the yoke 1, and the second fixed part 53 is fixed to the magnetic bowl 33 by the elastic part 52, so that the elastic part 52 elastically supports the magnetic circuit system 3, and the vibration damping effect is achieved.

[0053] In the embodiment, the cross section of the elastic part 52 along the vibration direction of the vibration system 2 is in S-shaped structure. The S-shaped structure has good elastic performance. Alternatively, the cross section of the elastic part 52 can be W-shaped or C-shaped, which can be selected according to specific needs.

[0054] In the embodiment, the first elastic damping member 5 is made of single-element damping material, high-molecular damping material or metal composite damping structure material.

[0055] The single-element damping material can be damping rubber, foamed foam, etc.; the high-molecular damping material can be a particle-doped fiber-doped and laminated composite material; and the metal composite damping structure can be a high-damping metal and a constrained layer damping structure.

[0056] In the embodiment, the yoke 1 includes a yoke body 101 in ring shape, a connecting part 102 extending from the inner periphery of the yoke body 101, and a mounting part 103 extending from the yoke body 101 towards the magnetic circuit system 3, the connecting part 102 is stacked on the side of the auxiliary magnetic steel 32 close to the vibration system 2, and the first elastic damping member 5 is fixed to the side of the mounting part 103 away from the vibration system 2.

[0057] As an optional embodiment of the present application, the first sound generating device 100 further includes a mass block 7 fixed to the side of the magnetic bowl 33 away from the vibration system 2, and the mass, the stiffness and the damping of the first elastic damping member 5 are adjusted to set the corresponding resonance frequency and the damping of the magnetic circuit suspension system, so as to achieve the best vibration isolation effect at the selected shell modal frequency. Optionally, the extension wall 8 of the magnetic bowl 33 can be connected by the first elastic damping member 5. The shape of the first elastic damping member 5 and the position connected to the yoke can be adjusted to adjust the radiation area in the cavity. The bottom of the magnetic bowl 33 can be provided with a mass block 7 to adjust the mass of the magnetic circuit suspension system.

[0058] The first elastic damping member 5 is connected to the magnetic bowl 33 and the cavity structure to form another vibration system composed of the magnetic unit 31, the magnetic bowl 33, and the first elastic damping member 5, which is subjected to an interaction force with the vibration system composed of the diaphragm 21, the dome 214, and the voice coil 22, and the vibration direction is opposite. Due to the interaction force of the two groups of vibration systems, the stress of the mobile phone shell fixedly connected to the module is reduced, and a certain vibration reduction effect is achieved. When the two sound generating elements of the mobile phone sound at the same time, the vibration mode caused by the structure of the mobile phone itself and the shape of the cavity in the mobile phone will occur, and the shell vibration phenomenon will be stronger at the modal frequency. In the cavity of the mobile phone, the pressure at the position of the magnetic circuit suspension system and the receiver in the cavity of the mobile phone is opposite, and the total pressure in the cavity is the difference between the two pressures, which can be reduced by the first sound generating device 100 and the second sound generating device 200 of the electronic device 1000. At the same time, by adjusting the mass, stiffness, and damping parameters of the magnetic circuit suspension system in the vibration reduction loudspeaker module to adjust the resonance frequency and Q value of the magnetic circuit suspension system, the resonance frequency is adjusted to be consistent with the modal frequency of the mobile phone shell vibration mode to be suppressed, so that the optimal vibration reduction effect is achieved.

[0059] In this embodiment, according to the design principle, the internal pressure curve of the mobile phone (representing the degree of shell vibration) and the two-in-one SPL curve (representing the sound performance) are obtained by simulation under the conditions of the conventional structure and the first vibration reduction structure. The debugging parameters in the figure make the vibration reduction best near the specified frequency of 200 Hz. According to the actual modal frequency of the mobile phone shell vibration, corresponding adjustments can be made. It can be seen that after the first vibration reduction structure is adopted, the internal pressure of the mobile phone is reduced, that is, the shell vibration is reduced, and at the same time, the two-in-one low-frequency sensitivity is increased to a certain extent.

[0060] Embodiment Two

[0061] Embodiment Two and Embodiment One have basically the same structure and basically the same technical effects, and the difference is that.

[0062] Please refer to FIGS. 1-8, on the basis of Embodiment Two, the magnetic unit 31 is provided with a through hole 313 formed in the vibration direction of the vibration system 2; the first sound generating device 100 further includes a non-magnetic connecting member 10 fixed to one side of the diaphragm 21 close to the magnetic circuit system 3 and a magnet assembly 9 fixed to one side of the non-magnetic connecting member 10 close to the magnetic circuit system 3, and the non-magnetic connecting member 10 and the magnet assembly 9 are suspended in the through hole 313.

[0063] Wherein, by hollowing the center of the magnetic unit 31, the magnet assembly 9 and the non-magnetic connecting piece 10 are fixedly connected with the ball top 214 of the non-magnetic material. By adjusting the shape of the magnet assembly 9 to match the nonlinear stiffness of the cavity, distortion can be further reduced. When the diaphragm 21 is in the initial position, the force of the newly added magnet assembly 9 and the electromagnetic assembly on the vibration area is zero; during the vibration of the diaphragm 21, the force of the magnet assembly 9 and the magnetic unit 31 on the vibration area is in the same direction as the vibration displacement of the vibration area, that is, it provides negative stiffness for the loudspeaker module, thereby reducing the system stiffness of the loudspeaker module, improving the low-frequency frequency response sensitivity, and making up for the low-frequency frequency response loss caused by the magnetic circuit suspension system. During the vibration of the diaphragm 21, the force of the magnet assembly 9 and the magnetic unit 31 on the vibration area is in the same direction as the vibration displacement of the vibration area, the amplitude of the magnetic circuit suspension system increases, the pressure of the magnetic circuit suspension system on the internal space of the mobile phone increases, and when the two sound emitting units of the mobile phone work simultaneously, the total pressure in the internal space of the mobile phone can be further reduced, and the shell vibration is further reduced. Since the magnetic circuit suspension system of the vibration-reducing electronic device 1000 is equivalent to the secondary diaphragm of the second sound emitting device 200 (two-in-one device), and the amplitude is increased, the low-frequency sensitivity of the two-in-one device is further increased. The second embodiment further improves the low-frequency frequency response of the module and the earpiece based on the advantages of the first embodiment, and improves the distortion of the module.

[0064] In the embodiment, the first sound emitting device 100 further includes a soft iron assembly 11 in a hollow structure located in the through hole 313 and fixed to the magnetic bowl 33, and the magnet assembly 9 is suspended in the hollow structure and spaced apart from the soft iron assembly 11. The soft iron assembly 11 can generate negative stiffness that changes with amplitude, thereby achieving nonlinear matching with the stiffness of the cavity and reducing distortion.

[0065] Specifically, when the diaphragm 21 is in the initial position, the force of the newly added magnet assembly 9 and the magnetic unit 31 on the vibration area is zero; during the vibration of the diaphragm 21, the force of the magnet assembly 9 and the magnetic unit 31 on the vibration area is in the same direction as the vibration displacement of the vibration area, and under the same excitation voltage, the vibration area can have a larger amplitude, which can improve the low-frequency frequency response sensitivity of the voice coil 22 suspension system and make up for the low-frequency frequency response loss caused by the magnetic circuit suspension. For the magnetic circuit suspension system, the amplitude of the magnetic circuit suspension also increases, and when the two sound emitting units of the mobile phone work simultaneously, the pressure in the internal space of the mobile phone can be further reduced, and the shell vibration is further reduced.

[0066] In this embodiment, please refer to FIG. 9-FIG. 11, as defined, the mass block 7 and the first elastic damping member 5 are the first damping structure, as defined, the center of the magnetic circuit of the first damping structure is hollowed out, and the structure that the magnet assembly 9 is connected with the ball top 214 is the second damping structure; the module spl and the two-in-one device spl curves (representing the sound performance) under the conventional structure, the first damping structure, the second damping structure, and the internal pressure curve of the mobile phone (representing the shell vibration degree). In the figure, the debugging parameters are adjusted to make the damping optimal near the specified frequency 200hz. According to the actual mobile phone shell vibration modal frequency, corresponding adjustment can be made. It can be seen that after adopting the second damping structure, the internal pressure of the mobile phone is further reduced, that is, the shell vibration is further reduced, and the low-frequency sensitivity of the damping module and the two-in-one device is increased.

[0067] In this embodiment, the soft iron assembly 11 includes a first soft iron layer 111 fixed to one side of the magnetic bowl 33 close to the vibration system 2, a first plastic layer 112 fixed to the first soft iron layer 111, and a second soft iron layer 113 fixed to the first plastic layer 112; the hollow structure is sequentially formed in the second soft iron layer 113, the first plastic layer 112, and the first soft iron layer 111.

[0068] In this embodiment, the soft iron assembly 11 further includes a second plastic layer 114, which is fixed between the first soft iron layer 111 and the magnetic bowl 33.

[0069] Example Three

[0070] Please refer to FIG. 1-FIG. 13, the structure of example three is basically the same as that of example one or example two, the difference is that the electronic device 1000 further includes a second elastic damping member 4, and the first sound device 100 is elastically supported on the shell 300 through the second elastic damping member 4. A suspension system is obtained by using the second elastic damping member 4 to connect the first sound device 100 and the mobile phone shell, which is opposite to the vibration pressure of the two-in-one device in the internal cavity of the mobile phone, and can further reduce the internal cavity pressure of the mobile phone. By reasonably designing the mass, stiffness, and damping parameters of the vibration system of the first sound device, and designing the resonant frequency of the entire module according to the parameters, the damping effect at the resonant frequency can be enhanced, thereby satisfying the damping effect of multiple frequency bands as a whole. By combining the magnetic circuit suspension system of the first sound device, the effect of suppressing shell vibration in multiple frequency ranges can also be achieved.

[0071] Wherein, the first sound generating device of the above-mentioned embodiment one or embodiment two and the mobile phone are connected by the second elastic damping member 4. The connection area is closed, and the size of the connection area can be adjusted to change the radiation area of the whole module suspension system in the mobile phone. The first sound generating device can also add the mass block 7, and by adjusting the mass of the mass block 7 and the stiffness and damping of the second elastic damping member 4, the corresponding resonance frequency and damping of the first sound generating device suspension system are set, the best vibration isolation effect under the selected shell vibration mode frequency is achieved, and the multi-band vibration reduction effect is realized.

[0072] Embodiment four

[0073] Please refer to the structure shown in FIG. 1-14, the structure of embodiment four is basically the same as that of embodiment one, the difference is that the first sound generating device 100 further comprises a third elastic damping member 6, and the third elastic damping member 6 connects the yoke 1 and the auxiliary magnetic steel 32.

[0074] Specifically, the third elastic damping member 6 is connected with the auxiliary magnetic steel 32, which can facilitate assembly and positioning, and can also share part of the stiffness and damping of the suspended magnetic circuit system 3.

[0075] In this embodiment, the second elastic damping member 4 and the third elastic damping member 6 are made of the same material as the first elastic damping member 5.

[0076] Compared with the related art, in the electronic device, the first sound generating device and the second sound generating device are fixed to the shell and arranged apart from each other, wherein the first sound generating device further comprises an upper shell fixed to the yoke near the vibration system, and the upper shell and the diaphragm surround to form a front cavity for sound output; the first sound generating device further comprises a first elastic damping member, the first elastic damping member connects the magnetic bowl and the yoke to support the vibration of the magnetic circuit system, and the diaphragm, the magnetic bowl, the yoke and the first elastic damping member are sealed to form a first rear cavity; the first sound generating device, the second sound generating device and the shell surround to form a second rear cavity; the vibration of the magnetic circuit system and the vibration of the vibration system form two suspension systems together, and the interaction force and the direction of the force are opposite, so that when the loudspeaker is connected to the terminal device for use, the stress is reduced, and a certain vibration reduction effect is achieved, thereby avoiding the shell vibration problem. In addition, when the first sound generating device and the second sound generating device sound, the first sound generating device and the second sound generating device are opposite in the internal pressure of the mobile phone, which can significantly reduce the internal pressure of the electronic device cavity in the frequency band where the shell vibration is obvious, and further achieve the effect of reducing the shell vibration. At the same time, the structure of the above-mentioned first sound generating device can increase the low frequency sensitivity of the second sound generating device, and further improve the acoustic performance of the sound generating device.

[0077] The above merely describes the embodiments of the present application, and it should be pointed out that, for those skilled in the art, improvements can be made without departing from the inventive concept, and these all belong to the protection scope of the present application.

Claims

1. An electronic device comprising a housing, and a first sound generating device and a second sound generating device accommodated in the housing, fixed to the housing and spaced apart from each other; characterized in that, the first sound generating device comprises a yoke, a vibration system fixed to the yoke, and a magnetic circuit system driving the vibration system to vibrate; the vibration system comprises a diaphragm fixed to the yoke, and a voice coil driving the diaphragm to vibrate and generate sound; the magnetic circuit system comprises a magnetic bowl fixed to the yoke, a magnetic unit fixed to the magnetic bowl near the vibration system, and a secondary magnetic steel spaced apart from the magnetic unit, the magnetic unit and the secondary magnetic steel being spaced apart to form a magnetic gap; the voice coil is inserted into the magnetic gap; the first sound generating device further comprises an upper shell fixed to the yoke near the vibration system, the upper shell and the diaphragm surrounding to form a front cavity for sound output; the first sound generating device further comprises a first elastic damping member connecting the magnetic bowl and the yoke to support the magnetic circuit system to vibrate, the diaphragm, the magnetic bowl, the yoke and the first elastic damping member being sealed to form a first back cavity; the first sound generating device, the second sound generating device and the housing surrounding to form a second back cavity.

2. The electronic device of claim 1, wherein, the first elastic damping member comprises a first fixed part in the form of a ring fixed to the yoke away from the vibration system, an elastic part bent and extended from the first fixed part to the side near the magnetic unit, and a second fixed part extended from the elastic part to the side near the magnetic unit, the second fixed part being fixed to the outer periphery of the magnetic bowl.

3. The electronic device of claim 2, wherein, the cross section of the elastic part along the vibration direction of the vibration system is in the form of S, W or C.

4. The electronic device of claim 1, wherein, the first elastic damping member is made of single damping material, high polymer damping material or metal composite damping structure material.

5. The electronic device of claim 1, wherein, the first sound generating device further comprises a mass fixed to the magnetic bowl away from the vibration system.

6. The electronic device of claim 1, wherein, a through hole is formed through the magnetic unit along the vibration direction of the vibration system; the first sound generating device further comprises a non-magnetic connection member fixed to the diaphragm near the magnetic circuit system, and a magnet assembly fixed to the non-magnetic connection member near the magnetic circuit system, the non-magnetic connection member and the magnet assembly being suspended in the through hole.

7. The electronic device of claim 6, wherein, the first sound generating device further comprises a soft iron assembly in the form of a hollow structure located in the through hole and fixed to the magnetic bowl, the magnet assembly being suspended in the hollow structure and spaced apart from the soft iron assembly.

8. The electronic device of claim 7, wherein, the soft iron assembly comprises a first soft iron layer fixed to the magnetic bowl near the vibration system, a first plastic layer fixed to the first soft iron layer, and a second soft iron layer fixed to the first plastic layer.

9. The electronic device of claim 8, wherein, the soft iron assembly further comprises a second plastic layer fixed between the first soft iron layer and the magnetic bowl.

10. The electronic device of any of claims 1-9, wherein, the electronic device further comprises a second elastic damping member, and the first sound generating device is elastically supported on the housing through the second elastic damping member.

11. The electronic device of any of claims 1-9, wherein, The first sound generating device further comprises a third elastic damping member connecting the yoke and the auxiliary magnetic steel.

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