Sound production device and electronic equipment

Abstract

The invention discloses a sound production device and electronic equipment, and relates to the technical field of electroacoustic transduction, the sound production device comprises a shell, a vibration system, a magnetic circuit system and an elastic piece, the vibration system comprises a plane diaphragm and a voice coil connected to the plane diaphragm, the periphery of the plane diaphragm is connected with the shell, the magnetic circuit system is connected to the shell, and the elastic piece is connected with the magnetic circuit system. The magnetic circuit system comprises a magnetic conductive yoke and a central magnetic part and an edge magnetic part which are arranged on the magnetic conductive yoke, the edge magnetic part is located on the outer side of the central magnetic part and is spaced from the central magnetic part to form a magnetic gap, the voice coil corresponds to the magnetic gap, one end of the elastic piece is connected with the plane diaphragm and / or the voice coil, and the other end of the elastic piece is connected with the plane diaphragm. The other end of the elastic piece is connected with the magnetic circuit system. The invention aims to provide the sound production device capable of increasing the effective vibration area, and the sound production device cancels a folding ring structure of a conventional vibrating diaphragm, thereby not only increasing the effective vibration area and improving the sensitivity, but also facilitating the adjustment of the amplitude symmetry of a product and reducing the total harmonic distortion of the product.

Description

Technical Field

[0001] The present invention relates to the technical field of electroacoustic transducer, and in particular to a sound-generating device and electronic equipment using the sound-generating device. Background Art

[0002] In recent years, convenient electronic devices (such as mobile phones, headphones, and computers) have become part of people's daily lives. With the rapid development of technology, the popularity of speakers is increasing. People's requirements for speakers are not limited to the playback of video and audio, but also have higher requirements for the sound quality and reliability of the sound played by the speakers. Speakers are directly related to the sound quality and product stability.

[0003] In the related art, a speaker generally includes a magnetic circuit system and a vibration system, wherein the vibration system includes a diaphragm and a voice coil combined with one side of the diaphragm. The voice coil with power can drive the diaphragm to vibrate under the action of the magnetic circuit system, thereby realizing the sound of the sound-generating device. The diaphragm of a conventional speaker is usually a diaphragm with a folded ring, and the structure of the speaker determines that its folded ring must have a certain width to ensure its deformation ability, which limits the size of the diaphragm dome and also limits the thickness of the magnetic circuit stacking under the folded ring of the diaphragm, thereby affecting the further improvement of performance; and the folded ring structure of the diaphragm is asymmetric, which is not conducive to the adjustment of the product amplitude symmetry and the reduction of the product total harmonic distortion. Summary of the invention

[0004] The main purpose of the present invention is to provide a sound-emitting device and an electronic device, aiming to provide a sound-emitting device with an increased effective vibration area. The sound-emitting device eliminates the folding ring structure of a conventional diaphragm, which not only increases the effective vibration area and improves sensitivity, but also facilitates the adjustment of the amplitude symmetry of the product and reduces the total harmonic distortion of the product.

[0005] To achieve the above object, the present invention provides a sound-generating device, comprising:

[0006] shell;

[0007] A vibration system, the vibration system comprising a planar diaphragm and a voice coil connected to the planar diaphragm, wherein the periphery of the planar diaphragm is connected to the housing;

[0008] a magnetic circuit system connected to the housing and opposite to and spaced from the planar diaphragm, the magnetic circuit system comprising a magnetic yoke and a central magnetic portion and a side magnetic portion provided on the magnetic yoke, the side magnetic portion being located outside the central magnetic portion and spaced from the central magnetic portion to form a magnetic gap, the voice coil being provided corresponding to the magnetic gap; and

[0009] An elastic member, one end of which is connected to the planar diaphragm and / or the voice coil, and the other end of which is connected to the magnetic circuit system.

[0010] In one embodiment, the planar diaphragm comprises:

[0011] A planar diaphragm, wherein the periphery of the planar diaphragm is connected to the housing, and the center of the planar diaphragm forms a hollow structure; and

[0012] A reinforcing portion, the reinforcing portion being connected to the planar diaphragm and covering the hollow structure;

[0013] Wherein, the voice coil is connected to the reinforcement part.

[0014] In one embodiment, the material of the planar diaphragm is a low modulus polymer material, and the elastic modulus of the planar diaphragm is less than 2 MPa;

[0015] And / or, the thickness of the planar diaphragm along its vibration direction is less than 0.1 mm;

[0016] And / or, the material of the planar diaphragm is any one of TPE, PEEK, silicone, and rubber;

[0017] And / or, the area of ​​the reinforcement portion is 75% to 90% of the area of ​​the planar diaphragm;

[0018] And / or, the material of the reinforcement part is any one of PEN, LCP, PEEK, carbon paper, and aluminum-magnesium alloy;

[0019] And / or, the periphery of the reinforcement portion is connected to the planar diaphragm through an adhesive layer;

[0020] And / or, a step surface is provided on the periphery of the reinforcement portion, the planar diaphragm is connected to the step surface, and a side of the planar diaphragm facing away from the magnetic circuit system is flush with a side of the reinforcement portion facing away from the magnetic circuit system;

[0021] And / or, the reinforcement portion is provided with a protruding structure, and the central magnetic portion is provided with a concave structure corresponding to the protruding structure.

[0022] In one embodiment, one end of the elastic member is connected to the reinforcing portion, and the other end of the elastic member is connected to the central magnetic portion and / or the side magnetic portion.

[0023] In one embodiment, the reinforcement portion is provided with a protruding structure, the protruding structure is located inside the voice coil, and the central magnetic portion is provided with a concave structure corresponding to the protruding structure;

[0024] One end of the elastic member is connected to the protruding structure, and one end of the elastic member is connected to the recessed structure.

[0025] In one embodiment, the central magnetic part includes a central magnet and a central magnetic conductive plate which are stacked, and the central magnet is connected to the magnetic conductive yoke;

[0026] The edge magnetic part includes a stacked edge magnet and an edge magnetic conductive plate, the edge magnet is connected to the magnetic conductive yoke, and the edge magnetic conductive plate is connected to the housing;

[0027] Wherein, the elastic member is connected to the central magnetic conductive plate and / or the side magnetic conductive plate.

[0028] In one embodiment, the central magnetic conductive plate and / or the side magnetic conductive plate are provided with a notch corresponding to the elastic member, and the elastic member passes through the notch to connect with the central magnet and / or the side magnet;

[0029] And / or, the side magnetic conductive plate and the shell are an integrally formed structure.

[0030] In one embodiment, the elastic member is disposed in the magnetic gap, one end of the elastic member is connected to the magnetic yoke, and the other end of the elastic member is connected to the voice coil;

[0031] And / or, one end of the elastic member is connected to the planar diaphragm, and the other end of the elastic member is connected to the central magnetic part and / or the edge magnetic part;

[0032] And / or, one end of the elastic member is connected to the bottom of the voice coil, and the other end of the elastic member is connected to the central magnetic part and / or the side magnetic part.

[0033] In one embodiment, the elastic member is at least one of a micro spring, a spring, and an elastic rubber block;

[0034] And / or, the elastic member comprises a plurality of elastic members, and the plurality of elastic members are arranged at intervals;

[0035] And / or, the vibration system further comprises a centering support plate, one end of the centering support plate is connected to the housing, and the other end of the centering support plate is connected to the voice coil.

[0036] The present invention further provides an electronic device, which includes the sound-generating device described above.

[0037] The sound-generating device of the technical solution of the present invention connects the vibration system and the magnetic circuit system to the housing so that the magnetic circuit system and the planar diaphragm of the vibration system are opposite to and spaced apart from each other, thereby conveniently providing a vibration space for the vibration of the planar diaphragm. At the same time, the magnetic circuit system is arranged as a magnetic yoke and a central magnetic part and a side magnetic part arranged on the magnetic yoke, so that the side magnetic part is located outside the central magnetic part and is spaced apart from the central magnetic part to form a magnetic gap, thereby the voice coil and the magnetic gap are arranged correspondingly, so that current is passed into the voice coil so that the voice coil vibrates in the magnetic field of the magnetic circuit system, thereby driving the planar diaphragm of the vibration system to vibrate and produce sound; further, the vibration The diaphragm of the dynamic system is set as a planar diaphragm, and an elastic member is provided so that one end of the elastic member is connected to the planar diaphragm and / or the voice coil, and the other end of the elastic member is connected to the magnetic circuit system. On the one hand, the elastic member is used to provide a restoring force for the planar diaphragm and / or the voice coil in the process of the voice coil driving the planar diaphragm to vibrate, and the restoring force provided by the elastic member is symmetrical and has better adjustability, which effectively reduces the total harmonic distortion of the product. On the other hand, the planar diaphragm not only increases the effective vibration area and improves the sensitivity, but also saves the Z-axis space at the edge magnet of the magnetic circuit system, so that the edge magnet can be made thicker, effectively improving the magnetic field strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0039] Figure 1 A schematic structural diagram of an embodiment of a sound-generating device provided by the present invention;

[0040] Figure 2 A cross-sectional schematic diagram of an embodiment of a sound-generating device provided by the present invention;

[0041] Figure 3 A cross-sectional schematic diagram of another embodiment of the sound-generating device provided by the present invention;

[0042] Figure 4 This is a schematic diagram of an exploded view of an embodiment of a sound-generating device provided by the present invention.

[0043] Description of Figure Numbers:

[0044] 100. Sound-generating device; 1. Housing; 2. Vibration system; 21. Planar diaphragm; 211. Planar diaphragm; 2111. Hollow structure; 212. Reinforcement part; 2121. Step surface; 2122. Raised structure; 22. Voice coil; 23. Centering support plate; 3. Magnetic circuit system; 31. Magnetic yoke; 32. Center magnetic part; 321. Center magnet; 322. Center magnetic plate; 323. Concave structure; 33. Side magnetic part; 331. Side magnet; 332. Side magnetic plate; 34. Magnetic gap; 4. Elastic member.

[0045] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0048] At the same time, the meaning of "and / or" or "and / or" appearing in the full text includes three options. Taking "A and / or B" as an example, it includes option A, or option B, or a option in which both A and B are satisfied.

[0049] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0050] In recent years, convenient electronic devices (such as mobile phones, headphones, and computers) have become part of people's daily lives. With the rapid development of technology, the popularity of speakers is increasing. People's requirements for speakers are not limited to the playback of video and audio, but also have higher requirements for the sound quality and reliability of the sound played by the speakers. Speakers are directly related to the sound quality and product stability.

[0051] In the related art, a speaker generally includes a magnetic circuit system and a vibration system, wherein the vibration system includes a diaphragm and a voice coil coupled to one side of the diaphragm. The energized voice coil can drive the diaphragm to vibrate under the action of the magnetic circuit system, thereby realizing the sound of the sound-generating device.

[0052] It should be noted that the diaphragm of a conventional speaker is usually a diaphragm with a folded ring, the outer side of the folded ring of the diaphragm is connected to the outer casing, the outer side of the folded ring of the diaphragm is connected to the Dome, the voice coil is distributed in the middle of the magnetic gap and connected to the Dome at the upper end, and the energized voice coil is subjected to the force in the magnetic field to drive the Dome of the upper diaphragm to vibrate back and forth, thereby driving the air molecules to vibrate and produce sound.

[0053] The structure of the speaker determines that its folding ring must have a certain width to ensure its deformation ability, which limits the size of the diaphragm dome and the thickness of the magnetic circuit stack under the folding ring of the diaphragm, thus affecting the further improvement of performance; and, because the folding ring of the diaphragm bulges in one direction, the restoring force provided upward and downward is asymmetric, making the folding ring of the diaphragm asymmetric, which is not conducive to the adjustment of the amplitude symmetry of the product and the reduction of the total harmonic distortion of the product.

[0054] Based on the above ideas and problems, the present invention proposes a sound-generating device 100. It can be understood that the sound-generating device 100 is applied to electronic devices, and the electronic devices can be mobile phones, computers, headphones, watches, etc., which are not limited here.

[0055] In this embodiment, the sound-emitting device 100 eliminates the folding ring structure of the conventional diaphragm, allowing the dome of the diaphragm to expand outward, thereby effectively increasing the effective vibration area (Sd) of the diaphragm and improving the sensitivity. At the same time, the planar diaphragm 21 of the sound-emitting device 100 can save the Z-axis space at the edge magnetic part 33 of the magnetic circuit system 3, so that the edge magnetic part 33 can be made thicker, thereby effectively improving the magnetic field strength.

[0056] Please refer to Figures 1 to 4As shown, in an embodiment of the present invention, the sound-generating device 100 includes a housing 1, a vibration system 2, a magnetic circuit system 3 and an elastic member 4, wherein the vibration system 2 includes a planar diaphragm 21 and a voice coil 22 connected to the planar diaphragm 21, the periphery of the planar diaphragm 21 is connected to the housing 1, the magnetic circuit system 3 is connected to the housing 1, and is opposite to and spaced from the planar diaphragm 21, the magnetic circuit system 3 includes a magnetic yoke 31 and a central magnetic portion 32 and a side magnetic portion 33 provided on the magnetic yoke 31, the side magnetic portion 33 is located on the outer side of the central magnetic portion 32, and is spaced from the central magnetic portion 32 to form a magnetic gap 34, the voice coil 22 and the magnetic gap 34 are arranged correspondingly, one end of the elastic member 4 is connected to the planar diaphragm 21 and / or the voice coil 22, and the other end of the elastic member 4 is connected to the magnetic circuit system 3.

[0057] In this embodiment, the housing 1 is used to install, fix, support and protect the vibration system 2, the magnetic circuit system 3 and other components, that is, the housing 1 provides an installation base for the vibration system 2, the magnetic circuit system 3 and other components. It can be understood that the housing 1 can be a structure such as a mounting shell, a shell or a box body with a mounting cavity, that is, the housing 1 defines a receiving space, which is not limited here.

[0058] Optionally, the housing 1 is a rectangular structure, and the housing 1 has two opposite long sides and two short sides, and the two ends of the short sides are respectively connected to the two long sides, and the two ends of the long sides are respectively connected to the two short sides, so that the housing 1 defines a receiving space. In this embodiment, the vibration system 2 and the magnetic circuit system 3 are respectively connected to the opposite ends of the housing 1, so that the magnetic circuit system 3 and the planar diaphragm 21 of the vibration system 2 are opposite and spaced apart, thereby providing a vibration space for the vibration of the planar diaphragm 21, avoiding the collision of the planar diaphragm 21 with the magnetic circuit system 3 during the vibration process, thereby affecting the performance of the sound-generating device 100.

[0059] It is understandable that the housing 1 can be optionally made of metal or plastic, etc., which is not limited here. When the housing 1 is a metal part, the magnetic circuit system 3 and the housing 1 are fixed by bonding or welding. In another embodiment, when the housing 1 is plastic injection molded, the side magnetic conductive plate 332 of the magnetic circuit system 3 is first injection molded into the housing 1 as an insert, or the magnetic circuit system 3 and the housing 1 are fixed by bonding, and then other parts are fixed by bonding, which is not limited here.

[0060] In this embodiment, the magnetic yoke 31 of the magnetic circuit system 3 is opposite to the planar diaphragm 21, the central magnetic portion 32 and the side magnetic portion 33 are both arranged on the side of the magnetic yoke 31 facing the planar diaphragm 21, and the magnetic circuit system 3 can be connected to the outer shell 1 through the side magnetic portion 33 and / or the magnetic yoke 31.

[0061] Optionally, the magnetic yoke 31 may be a magnetic plate or a magnetic basin frame, etc., which is not limited here. The magnetic yoke 31 is used to support and install the central magnetic part 32 and the side magnetic part 33. In this embodiment, the magnetic yoke 31 is bonded to the central magnetic part 32 and the side magnetic part 33, and the side magnetic part 33 is bonded to the housing 1.

[0062] In this embodiment, the magnetic circuit system 3 is arranged in the receiving space of the housing 1 and connected to the housing 1. It can be understood that by setting the magnetic circuit system 3 as a magnetic yoke 31 and a central magnetic part 32 and a side magnetic part 33 provided on the magnetic yoke 31, the side magnetic part 33 is located outside the central magnetic part 32 and is spaced from the central magnetic part 32 to form a magnetic gap 34, and the vibration system 2 is set as a planar diaphragm 21 and a voice coil 22 connected to the planar diaphragm 21, so that the voice coil 22 of the vibration system 2 is arranged corresponding to the magnetic gap 34, so that when current is passed into the voice coil 22, the voice coil 22 vibrates in the magnetic field of the magnetic circuit system 3, thereby driving the planar diaphragm 21 of the vibration system 2 to vibrate and produce sound. At the same time, by setting the diaphragm of the vibration system 2 to a planar diaphragm 21 and setting an elastic member 4, so that one end of the elastic member 4 is connected to the planar diaphragm 21 and / or the voice coil 22, and the other end of the elastic member 4 is connected to the magnetic circuit system 3, on the one hand, in the process of the voice coil 22 driving the planar diaphragm 21 to vibrate, the elastic member 4 is used to provide a restoring force for the planar diaphragm 21 and / or the voice coil 22, and the restoring force provided by the elastic member 4 is symmetrical and has better adjustability, which effectively reduces the total harmonic distortion of the sound-generating device 100. On the other hand, the planar diaphragm 21 not only increases the effective vibration area and improves the sensitivity, but also saves the Z-axis space at the side magnetic portion 33 of the magnetic circuit system 3, so that the side magnetic portion 33 can be made thicker, effectively improving the magnetic field strength.

[0063] Optionally, the voice coil 22 is an annular racetrack voice coil, one end of the voice coil 22 is connected to the planar diaphragm 21, and the other end of the voice coil 22 is suspended in the magnetic gap 34, which is not limited here. It should be noted that by passing current into the voice coil 22, the voice coil 22 transfers electrical energy to the magnetic gap 34 of the magnetic circuit system 3, so that the magnetic field generated by the magnetic circuit system 3 converts the electrical energy into mechanical energy, thereby causing the voice coil 22 to vibrate, and at the same time drives the planar diaphragm 21 to vibrate and produce sound, further converting the mechanical energy into sound energy.

[0064] It can be understood that after the voice coil 22 disposed in the magnetic gap 34 receives the external alternating current signal, it moves back and forth to cut the magnetic field lines driven by the magnetic field force of the magnetic circuit system 3, driving the planar diaphragm 21 of the vibration system 2 to vibrate and produce sound. At the same time, the arrangement of the planar diaphragm 21 saves the Z-axis space at the edge magnetic part 33 of the magnetic circuit system 3, so that the edge magnetic part 33 can be made thicker, effectively improving the magnetic field strength, so that the voice coil 22 cooperates to improve the driving force on the planar diaphragm 21, thereby effectively improving the BL value of the sound-generating device 100 and improving the vibration effect of the planar diaphragm 21.

[0065] In order to realize the electrical connection between the voice coil 22 and the external circuit, in one embodiment, the vibration system 2 further includes a centering support 23 or a connector or a frame, one end of which is connected to the voice coil 22 and is connected to the lead wire of the voice coil 22, and the other end of which is connected to the housing 1.

[0066] It can be understood that, taking the centering support 23 as an example, the two ends of the centering support 23 are electrically connected to the lead wire of the voice coil 22 and the external circuit respectively. In this embodiment, the centering support 23 can be arranged at the bottom of the voice coil 22, and the centering support 23 is located at the four corners of the sound-generating device 100 or in the short axis or long axis direction of the sound-generating device 100. Of course, the centering support 23 can also be arranged at the top of the voice coil 22, and the centering support 23 is located between the voice coil 22 and the planar diaphragm 21, which is not limited here.

[0067] The sound-generating device 100 of the present invention connects the vibration system 2 and the magnetic circuit system 3 to the housing 1, so that the magnetic circuit system 3 is opposite to and spaced from the planar diaphragm 21 of the vibration system 2, thereby conveniently providing a vibration space for the vibration of the planar diaphragm 21. At the same time, the magnetic circuit system 3 is configured as a magnetic yoke 31 and a central magnetic portion 32 and a side magnetic portion 33 provided on the magnetic yoke 31, so that the side magnetic portion 33 is located outside the central magnetic portion 32 and spaced from the central magnetic portion 32 to form a magnetic gap 34, so that the voice coil 22 and the magnetic gap 34 are correspondingly configured. In this way, current is passed into the voice coil 22, so that the voice coil 22 vibrates in the magnetic field of the magnetic circuit system 3, thereby driving the planar diaphragm 21 of the vibration system 2 to vibrate and generate sound. The diaphragm of the vibration system 2 is further set to a planar diaphragm 21, and an elastic member 4 is set, so that one end of the elastic member 4 is connected to the planar diaphragm 21 and / or the voice coil 22, and the other end of the elastic member 4 is connected to the magnetic circuit system 3. On the one hand, the elastic member 4 is used to provide a restoring force for the planar diaphragm 21 and / or the voice coil 22 in the process of the voice coil 22 driving the planar diaphragm 21 to vibrate, and the restoring force provided by the elastic member 4 is symmetrical and has better adjustability, which effectively reduces the total harmonic distortion of the product. On the other hand, the planar diaphragm 21 not only increases the effective vibration area and improves the sensitivity, but also the planar diaphragm 21 saves the Z-axis space at the edge magnet of the magnetic circuit system 3, so that the edge magnet can be made thicker, effectively improving the magnetic field strength.

[0068] In one embodiment, the planar diaphragm 21 includes a planar diaphragm 211 and a reinforcement portion 212, the periphery of the planar diaphragm 211 is connected to the outer shell 1, a hollow structure 2111 is formed in the center of the planar diaphragm 211, the reinforcement portion 212 is connected to the planar diaphragm 211, and covers the hollow structure 2111; wherein the voice coil 22 is connected to the reinforcement portion 212.

[0069] In this embodiment, if Figures 1 to 4 As shown, by setting the planar diaphragm 21 as a two-part structure of a planar diaphragm 211 and a reinforcement part 212, the planar diaphragm 211 is connected to the housing 1, and the reinforcement part 212 is connected to the center of the planar diaphragm 211, the reinforcement part 212 can be used to improve the structural strength of the planar diaphragm 211, and a hollow structure 2111 is set in the center of the planar diaphragm 211, and the hollow structure 2111 is covered by the reinforcement part 212, which can not only reduce the weight of the planar diaphragm 21, but also ensure the sealing performance of the planar diaphragm 21.

[0070] Optionally, the elastic modulus of the planar diaphragm 211 is less than 2MPa, and the planar diaphragm 211 may be a low modulus polymer material. It is understandable that by eliminating the large folded ring structure of the conventional diaphragm and replacing it with the planar diaphragm 21 of the planar diaphragm 21, and the planar diaphragm 211 has a low modulus and high compliance, it is beneficial for the planar diaphragm 21 to vibrate under the drive of the voice coil 22, thereby improving the sound effect. And by replacing the conventional folded ring with the planar diaphragm 211, the width of the planar diaphragm 21 is reduced, which is beneficial to increase the size of the reinforcement part 212, increase the effective vibration area of ​​the planar diaphragm 21, and improve the sensitivity.

[0071] Optionally, the material of the planar diaphragm 211 is a low modulus polymer material. In this embodiment, the material of the planar diaphragm 211 can be any one of TPE, PEEK, silicone, and rubber.

[0072] In this embodiment, the thickness of the planar diaphragm 211 along its vibration direction can be optionally less than 0.1 mm. It can be understood that such a configuration can effectively ensure the compliance and quality of the planar diaphragm 211 and improve the sound performance of the planar diaphragm 211.

[0073] In one embodiment, the area of ​​the reinforcement portion 212 is 75% to 90% of the area of ​​the planar diaphragm 21. By using the planar diaphragm 211, the size of the reinforcement portion 212 is effectively increased, so that the area of ​​the reinforcement portion 212 accounts for 75% to 90% of the area of ​​the planar diaphragm 21, thereby increasing the effective vibration area of ​​the planar diaphragm 21 and improving the sensitivity of the sound-generating device 100.

[0074] In this embodiment, the material of the reinforcing portion 212 can be any one of PEN, LCP, PEEK, carbon paper, and aluminum-magnesium alloy, which can be flexibly selected according to needs and is not limited here. It can be understood that by providing the reinforcing portion 212 in the central area of ​​the planar diaphragm 21 of the planar diaphragm 21, the rigidity of the planar diaphragm 21 can be further improved, and its sound performance can be improved.

[0075] Of course, in other embodiments, the planar diaphragm 21 may be an integrally formed structure, for example, the planar diaphragm 211 and the reinforcement portion 212 may be integrally formed, or the entire planar diaphragm 21 may be configured as the planar diaphragm 211 , which is not limited here.

[0076] In this embodiment, the periphery of the reinforcement portion 212 is connected to the planar diaphragm 211 through a glue layer. In order to ensure the thickness of the planar diaphragm 21 and the sound performance, in one embodiment, Figures 2 to 4 As shown, a step surface 2121 is provided at the periphery of the reinforcement part 212, the planar diaphragm 211 is connected to the step surface 2121, and the side of the planar diaphragm 211 facing away from the magnetic circuit system 3 is flush with the side of the reinforcement part 212 facing away from the magnetic circuit system 3. Optionally, a glue layer is provided between the step surface 2121 of the reinforcement part 212 and the planar diaphragm 211.

[0077] In order to further improve the structural strength of the reinforcement portion 212, in one embodiment, Figures 1 to 4 As shown, the reinforcement part 212 is provided with a protruding structure 2122. It is understandable that the protruding structure 2122 can be a rib structure or a protruding structure directly provided on the surface of the reinforcement part 212; or, the protruding structure 2122 can also be formed by protruding from one surface of the reinforcement part 212 to another surface, which is not limited here.

[0078] In order to further ensure that the reinforcement portion 212 avoids collision with the magnetic circuit system 3 during vibration, in this embodiment, Figures 2 to 4 As shown, the central magnetic portion 32 of the magnetic circuit system 3 is provided with a recessed structure 323 corresponding to the raised structure 2122 .

[0079] In one embodiment, one end of the elastic member 4 is connected to the reinforcing portion 212 , and the other end of the elastic member 4 is connected to the central magnetic portion 32 and / or the side magnetic portion 33 .

[0080] In this embodiment, if Figures 2 to 4 As shown, one end of the elastic member 4 is connected to the reinforcing portion 212, and the other end of the elastic member 4 is connected to the central magnetic portion 32. In another embodiment, one end of the elastic member 4 is connected to the reinforcing portion 212, and the other end of the elastic member 4 is connected to the edge magnetic portion 33.

[0081] Optionally, the elastic member 4 includes a plurality of elastic members 4, and the plurality of elastic members 4 are arranged at intervals. One end of the plurality of elastic members 4 is connected to the reinforcing portion 212, and the other end of the plurality of elastic members 4 is connected to the central magnetic portion 32, in which case the elastic member 4 is arranged on the inner side of the voice coil 32; or one end of the plurality of elastic members 4 is connected to the reinforcing portion 212, and the other end of the plurality of elastic members 4 is connected to the side magnetic portion 33, in which case the elastic member 4 is arranged on the outer side of the voice coil 32; or one end of the plurality of elastic members 4 is connected to the reinforcing portion 212, and the other end of some of the elastic members 4 is connected to the central magnetic portion 32, and the other end of some of the elastic members 4 is connected to the side magnetic portion 33, and the elastic member 4 is partially arranged on the inner side of the voice coil 32 and partially arranged on the outer side of the voice coil 32, which is not limited here.

[0082] It is understandable that the number of elastic members 4 can be one or more, and the elastic members 4 can be located in different areas below the Dome. For example, there are two elastic members 4, and the two elastic members are arranged side by side along the long axis of the planar diaphragm 21, and one end of the two elastic members 4 is connected to the central area of ​​the Dome, and the other end is connected to the central magnetic part 32. Optionally, the elastic member 4 is at least one of a micro spring, a spring, and an elastic rubber block.

[0083] In one embodiment, the elastic member 4 is disposed in the magnetic gap 34 , one end of the elastic member 4 is connected to the magnetic yoke 31 , and the other end of the elastic member 4 is connected to the voice coil 22 .

[0084] In another embodiment, one end of the elastic member 4 is connected to the bottom of the voice coil 22, and the other end of the elastic member 4 is connected to the central magnetic portion 32 and / or the side magnetic portion 33. That is, the elastic member 4 is arranged in a direction perpendicular to the vibration direction of the voice coil 22.

[0085] Of course, in other embodiments, the elastic member 4 includes multiple elastic members, in which case some of the elastic members 4 are arranged in the magnetic gap 34, and one end of the elastic member 4 is connected to the magnetic yoke 31, and the other end of the elastic member 4 is connected to the voice coil 22; one end of some of the elastic members 4 is connected to the planar diaphragm 21, and the other end is connected to the central magnetic portion 32 and / or the side magnetic portion 33; one end of some of the elastic members 4 is connected to the bottom of the voice coil 22, and the other end is connected to the central magnetic portion 32 and / or the side magnetic portion 33, which is not limited here.

[0086] In one embodiment, if Figures 2 to 4 As shown, the reinforcement part 212 is provided with a protruding structure 2122, the protruding structure 2122 is located inside the voice coil 22, and the central magnetic part 32 is provided with a recessed structure 323 corresponding to the protruding structure 2122; one end of the elastic member 4 is connected to the protruding structure 2122, and the other end of the elastic member 4 is connected to the recessed structure 323. It can be understood that the setting of the recessed structure 323, on the one hand, provides an escape space for the protruding structure 2122 of the reinforcement part 212, and on the other hand, also provides space for the elastic member 4.

[0087] In one embodiment, the central magnetic portion 32 includes a stacked central magnet 321 and a central magnetic conductive plate 322, and the central magnet 321 is connected to the magnetic yoke 31; the side magnetic portion 33 includes a stacked side magnet 331 and a side magnetic conductive plate 332, and the side magnet 331 is connected to the magnetic yoke 31, and the side magnetic conductive plate 332 is connected to the outer shell 1; wherein the elastic member 4 is connected to the central magnetic conductive plate 322 and / or the side magnetic conductive plate 332.

[0088] In this embodiment, if Figures 2 to 4 As shown, the center magnet 321 and the center magnetic plate 322 of the center magnetic part 32 are stacked along the moving direction of the voice coil 22 in the magnetic gap 34, and the side magnets 331 and the side magnetic plates 332 of the side magnetic part 33 are stacked along the moving direction of the voice coil 22 in the magnetic gap 34. Optionally, the center magnet 321 is sandwiched between the center magnetic plate 322 and the magnetic yoke 31. Optionally, the side magnet 331 is sandwiched between the side magnetic plates 332 and the magnetic yoke 31.

[0089] In order to further improve the connection strength between the shell 1 and the magnetic circuit system 3, and to simplify the processing steps of the shell 1, in this embodiment, the side magnetic conductive plate 332 and the shell 1 can be selected as an integrally formed structure, that is, the side magnetic conductive plate 332 and the shell 1 can be integrally injection molded or integrally processed, etc., which is not limited here.

[0090] In one embodiment, the central magnetic conductive plate 322 and / or the side magnetic conductive plate 332 are provided with a notch corresponding to the elastic member 4, and the elastic member 4 passes through the notch to connect with the central magnet 321 and / or the side magnet 331. It can be understood that by providing a notch in the central magnetic conductive plate 322 of the central magnetic part 32, the notch is used to provide space for the expansion and contraction of the elastic member 4, so as to ensure the performance of the elastic member 4. By providing a notch in the side magnetic conductive plate 332 of the side magnetic part 33, the notch is used to provide space for the expansion and contraction of the elastic member 4, so as to ensure the performance of the elastic member 4.

[0091] Optionally, the side magnet part 33 of the magnetic circuit system 3 forms a closed integral ring structure. It can be understood that such a configuration can effectively improve the magnetic field strength of the side magnet part 33, thereby improving the driving force of the voice coil 22. Of course, the side magnet part 33 includes a plurality of side magnet parts 33, and adjacent side magnet parts 33 are connected end to end to form a closed ring structure; or, the side magnet part 33 includes a plurality of side magnet parts 33, and the plurality of side magnet parts 33 are spaced and arranged around the central magnet part 32, and there are gaps between adjacent side magnet parts 33, which is not limited here.

[0092] In one embodiment, the vibration system 2 further includes a centering support plate 23 , one end of the centering support plate 23 is connected to the housing 1 , and the other end of the centering support plate 23 is connected to the voice coil 22 .

[0093] In this embodiment, if Figures 2 to 4As shown, the arrangement of the centering support 23 can not only realize the connection between the voice coil 22 and the external circuit, but also play a centering role for the voice coil 22, thereby improving the sound effect. Figure 4 As shown, the centering support plate 23 includes an outer fixing portion, an elastic wall portion and an inner fixing portion which are connected in sequence, the outer fixing portion is connected to the outer shell 1 and / or the edge magnetic portion 33, the inner fixing portion is provided with an inner solder pad, the voice coil 22 is connected to the inner fixing portion, and the lead of the voice coil 22 is electrically connected to the inner solder pad.

[0094] Optionally, the outer fixing portion, the elastic wall portion and the inner fixing portion of the centering support 23 may be an integrally formed structure. This can effectively ensure the structural strength of the centering support 23 and simplify the processing steps of the centering support 23. It is understandable that in order to ensure the deformation capacity of the centering support 23, the elastic wall portion has at least one bend.

[0095] Optionally, the outer fixing portion, the elastic wall portion and the inner fixing portion of the centering support piece 23 may be located in the same plane. Of course, in other embodiments, the outer fixing portion and the inner fixing portion of the centering support piece 23 may also be located in different planes.

[0096] It is understandable that the number of the centering arms 23 may be one or more. When the number of the centering arms 23 is plural, the number of the centering arms 23 may be two or four.

[0097] In one embodiment, the housing 1 has two long sides and two short sides connected end to end, and the centering support pieces 23 include two. The two centering support pieces 23 are symmetrically arranged and respectively correspond to the two short sides.

[0098] In another embodiment, the number of centering support pieces 23 is four, and the four centering support pieces 23 are respectively arranged corresponding to the four corner positions of the housing 1 .

[0099] In order to facilitate the connection between the centering support plate 23 and the voice coil 22, in the present embodiment, the side magnet portion 33 is provided with an escape gap connected to the magnetic gap 34, and the elastic wall portion of the centering support plate 23 is located in the escape gap, so that the inner fixed portion of the centering support plate 23 extends into the magnetic gap 34 and is connected to the voice coil 22, which is not limited here.

[0100] The sound-emitting device 100 of the present application adopts a planar diaphragm 21, which includes a low-modulus planar diaphragm 211 and a reinforcement part 212 connected to the outer shell 1 through the planar diaphragm 211, which effectively expands the size of the reinforcement part 212, and adopts elastic parts 4 such as springs to connect the reinforcement part 212 and fixed parts such as magnets. The elastic parts 4 replace the diaphragm of the traditional folded ring structure to provide restoring force, which not only eliminates the folded ring of the conventional diaphragm, but also increases the size of the reinforcement part 212, thereby increasing the effective vibration area Sd of the planar diaphragm 21, that is, increasing the effective radiation area and improving the acoustic volume.

[0101] It can be understood that in the present application, the Sd of the sound-emitting device 100 is significantly increased, the acoustic volume is improved, and the sensitivity is improved, which can increase the Sd by 15%, and the mid-frequency performance is improved by about 1dB; at the same time, the planar diaphragm 21 of the sound-emitting device 100 has no spatial limitation of the folded ring, which saves the Z-axis space at the edge magnet of the magnetic circuit system 3, and the edge magnet can be made thicker, thereby improving the electromechanical coupling coefficient and the volume, so that the edge magnet can be thickened by 0.1mm, and the performance can be improved by about 0.3dB; further, the Kmsx curve of the elastic parts 4 such as springs is easier to make symmetrical, has better adjustability, and is easier to adjust the product distortion.

[0102] It should be noted that, compared with the conventional diaphragm folded ring structure, the folded ring structure bulges in one direction, so that the restoring force provided by the folded ring structure in the upward and downward process is asymmetric, thereby reducing distortion. In the present application, the energized voice coil 22 is subjected to force in the magnetic gap 34 to drive the Dome to move. During the upward movement of the Dome, the elastic member 4 stretches to provide a downward restoring force; during the downward movement of the Dome, the elastic member 4 compresses to provide an upward restoring force. Here, the elastic member 4 replaces the conventional folded ring diaphragm to perform the restoring force function, so that the Kmsx curve of the elastic member 4 is easier to make symmetrical, better adjustable, and easier to adjust the product distortion.

[0103] The present invention further provides an electronic device, which includes the above-mentioned sound-generating device 100. The specific structure of the sound-generating device 100 refers to the above-mentioned embodiment. Since the electronic device adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0104] In one embodiment, the electronic device further comprises a device housing, the device housing has an installation space, and the sound device 100 is arranged in the installation space of the device housing. Of course, in other embodiments, the electronic device may include a sound module, which is not limited here.

[0105] In this embodiment, the electronic device further includes a flexible circuit board, one end of which is electrically connected to the sound-generating device 100, and the other end of which is used to connect to an external power source. It can be understood that the flexible circuit board is used to connect the external circuit to the voice coil 22 of the sound-generating device 100. The flexible circuit board is provided with an inner pad and an outer pad, the inner pad of the flexible circuit board is connected to the sound-generating device 100, and the outer pad of the flexible circuit board is used to connect to an external terminal.

[0106] In this embodiment, the device housing has an installation space, the sound device 100 is disposed in the installation space of the device housing, and at least one end of the flexible circuit board connected to the sound device 100 is located in the installation space of the device housing. Of course, in other embodiments, the flexible circuit board can also be entirely disposed in the installation space of the device housing, which is not limited here.

[0107] It is understandable that the electronic device can be headphones, mobile phones, MP3, MP4, computers, tablet computers, smart wearable devices, etc., which are not limited here. In the electronic device, the sound device 100 can be assembled into the housing of the electronic device in the form of a module, or it can be assembled into the housing of the electronic device in the form of a single body.

[0108] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A sound-generating device, characterized in that: The sound-generating device comprises: shell; A vibration system, the vibration system comprising a planar diaphragm and a voice coil connected to the planar diaphragm, wherein the periphery of the planar diaphragm is connected to the housing; a magnetic circuit system connected to the housing and opposite to and spaced from the planar diaphragm, the magnetic circuit system comprising a magnetic yoke and a central magnetic portion and a side magnetic portion provided on the magnetic yoke, the side magnetic portion being located outside the central magnetic portion and spaced from the central magnetic portion to form a magnetic gap, the voice coil being provided corresponding to the magnetic gap; and An elastic member, one end of which is connected to the planar diaphragm and / or the voice coil, and the other end of which is connected to the magnetic circuit system.

2. The sound-generating device according to claim 1, characterized in that: The planar diaphragm comprises: A planar diaphragm, wherein the periphery of the planar diaphragm is connected to the housing, and the center of the planar diaphragm forms a hollow structure; and A reinforcing portion, the reinforcing portion being connected to the planar diaphragm and covering the hollow structure; Wherein, the voice coil is connected to the reinforcement part.

3. The sound-generating device according to claim 2, characterized in that: The elastic modulus of the planar diaphragm is less than 2 MPa; And / or, the thickness of the planar diaphragm along its vibration direction is less than 0.1 mm; And / or, the material of the planar diaphragm is any one of TPE, PEEK, silicone, and rubber; And / or, the area of ​​the reinforcement portion is 75% to 90% of the area of ​​the planar diaphragm; And / or, the material of the reinforcement part is any one of PEN, LCP, PEEK, carbon paper, and aluminum-magnesium alloy; And / or, the periphery of the reinforcement portion is connected to the planar diaphragm through an adhesive layer; And / or, a step surface is provided on the periphery of the reinforcement portion, the planar diaphragm is connected to the step surface, and a side of the planar diaphragm facing away from the magnetic circuit system is flush with a side of the reinforcement portion facing away from the magnetic circuit system; And / or, the reinforcement portion is provided with a protruding structure, and the central magnetic portion is provided with a concave structure corresponding to the protruding structure.

4. The sound generating device according to claim 2, characterized in that: One end of the elastic member is connected to the reinforcing portion, and the other end of the elastic member is connected to the central magnetic portion and / or the side magnetic portion.

5. The sound generating device according to claim 4, characterized in that: The reinforcement portion is provided with a convex structure, the convex structure is located inside the voice coil, and the central magnetic portion is provided with a concave structure corresponding to the convex structure; One end of the elastic member is connected to the protruding structure, and one end of the elastic member is connected to the recessed structure.

6. The sound generating device according to claim 4, characterized in that: The central magnetic part includes a central magnet and a central magnetic conductive plate which are stacked, and the central magnet is connected to the magnetic conductive yoke; The edge magnetic part includes a stacked edge magnet and an edge magnetic conductive plate, the edge magnet is connected to the magnetic conductive yoke, and the edge magnetic conductive plate is connected to the housing; Wherein, the elastic member is connected to the central magnetic conductive plate and / or the side magnetic conductive plate.

7. The sound generating device according to claim 6, characterized in that: The central magnetic conductive plate and / or the side magnetic conductive plate are provided with a notch corresponding to the elastic member, and the elastic member passes through the notch to connect with the central magnet and / or the side magnet; And / or, the side magnetic conductive plate and the shell are an integrally formed structure.

8. The sound generating device according to claim 1, characterized in that: The elastic member is arranged in the magnetic gap, one end of the elastic member is connected to the magnetic yoke, and the other end of the elastic member is connected to the voice coil; And / or, one end of the elastic member is connected to the planar diaphragm, and the other end of the elastic member is connected to the central magnetic part and / or the edge magnetic part; And / or, one end of the elastic member is connected to the bottom of the voice coil, and the other end of the elastic member is connected to the central magnetic part and / or the side magnetic part.

9. The sound generating device according to any one of claims 1 to 8, characterized in that: The elastic member is at least one of a micro spring, a spring, and an elastic rubber block; And / or, the elastic member comprises a plurality of elastic members, and the plurality of elastic members are arranged at intervals; And / or, the vibration system further comprises a centering support plate, one end of the centering support plate is connected to the housing, and the other end of the centering support plate is connected to the voice coil.

10. An electronic device, characterized in that: The electronic device comprises the sound emitting device according to any one of claims 1 to 9.

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