Sound generating device and electronic device

Abstract

The present invention discloses a sound generating device and an electronic device. The sound generating device includes a housing, a magnetic circuit system, and a vibration system. The housing is a metal part and has a cavity. The housing further has a support arm located in the cavity. The magnetic circuit system is connected to the housing and is located in the cavity. The magnetic circuit system has a magnetic gap, and the support arm is located outside the magnetic gap. The vibration system includes a diaphragm and a voice coil. The diaphragm is connected to the housing and is opposite to and spaced from the magnetic circuit system. One end of the voice coil is connected to the diaphragm, and the other end is suspended in the magnetic gap. The voice coil has a lead wire, and the lead wire is guided from the magnetic gap to the support arm and supported by the support arm. The present invention aims to provide a sound generating device that is convenient for processing and assembly and reduces costs. The sound generating device not only effectively avoids the breakage of the voice coil lead wire, but also simplifies the routing method of the voice coil lead wire and improves the stability of the connection of the voice coil lead wire.

Description

Technical Field

[0001] The present invention relates to the technical field of electroacoustic conversion, and particularly relates to a sound generating device and an electronic device applying the sound generating device. Background Art

[0002] With the development of the market of portable consumer electronic products, micro sound generating devices have been widely used. And with the multi-functional and miniaturized design of portable terminal electronic products, higher requirements are put forward for the vibration acoustic performance of micro sound generators.

[0003] A sound generating device generally includes a housing and a magnetic circuit system and a vibration system accommodated in the housing. Among them, the housing generally adopts an injection molded part or integrally injects a metal conductive part and a plastic part, resulting in a relatively large overall structure, complicated processing, and high production cost. At the same time, the vibration system includes a diaphragm and a voice coil combined on one side of the diaphragm. Usually, the lead of the voice coil is conducted with an external circuit through a centering support piece or other conductive parts, so that the energized voice coil can drive the diaphragm to vibrate under the action of the magnetic circuit system, thereby realizing the sound generation of the sound generating device. However, the lead of the voice coil usually adopts a suspended lead method to conduct electricity, and there is a risk of wire breakage. Summary of the Invention

[0004] The main object of the present invention is to provide a sound generating device and an electronic device, aiming to provide a sound generating device that is convenient for processing and assembly and reduces costs. This sound generating device not only effectively avoids the breakage of the voice coil lead, but also simplifies the routing method of the voice coil lead and improves the stability of the connection of the voice coil lead.

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

[0006] A housing, the housing is a metal part, the housing has a cavity, and the housing is further provided with a support arm located in the cavity;

[0007] A magnetic circuit system, the magnetic circuit system is connected to the housing and is located in the cavity, the magnetic circuit system is provided with a magnetic gap, and the support arm is located outside the magnetic gap; and

[0008] A vibration system, the vibration system includes a diaphragm and a voice coil, the diaphragm is connected to the housing and is opposite to and spaced from the magnetic circuit system, one end of the voice coil is connected to the diaphragm, and the other end is suspended in the magnetic gap. The voice coil has a lead, and the lead is guided from the magnetic gap to the support arm and supported on the support arm.

[0009] In one embodiment, the housing includes a flat wall and a vertical wall. The vertical wall is formed by bending and extending from the flat wall. The flat wall and the vertical wall enclose a cavity. The support arm is formed by bending and extending from the vertical wall toward the inside of the cavity and is opposite to and spaced from the flat wall.

[0010] The magnetic circuit system has a vertical portion located in the cavity. The vertical portion is located inside the vertical wall and is spaced from the vertical wall to cooperate to form a wiring cavity. The support arm is located in the wiring cavity.

[0011] Wherein, the lead wire is guided from within the magnetic gap to the wiring cavity and is supported by the support arm.

[0012] In one embodiment, the support arm includes a connected platform portion and an inclined portion. The platform portion is connected to the vertical wall, and the inclined portion extends obliquely from the platform portion toward the inside of the wiring cavity.

[0013] The sound generating device further includes a conductive member. The conductive member is disposed on the platform portion. The lead wire is supported by the support arm and is connected to the conductive member.

[0014] In one embodiment, the distance from the inclined portion to the flat wall gradually decreases from one end adjacent to the platform portion to the end far from the platform portion.

[0015] And / or, one end of the lead wire adjacent to the conductive member is connected to the inclined portion through an adhesive layer, and the adhesive layer is a damping adhesive.

[0016] And / or, the conductive member is an FPCB.

[0017] In one embodiment, the voice coil has a long-axis side and a short-axis side connected end to end.

[0018] There are two lead wires, and each lead wire is disposed corresponding to one long-axis side.

[0019] The vertical wall is bent and extended corresponding to each long-axis side to form a support arm, and the vertical portion and the vertical wall form a wiring cavity corresponding to each long-axis side.

[0020] Wherein, each lead wire is guided from within the magnetic gap to a wiring cavity and is supported by a support arm.

[0021] In one embodiment, the magnetic circuit system includes:

[0022] A magnetic yoke, the magnetic yoke includes a bottom and the vertical portion provided on the periphery of the bottom. The vertical portion and the bottom enclose a receiving groove; and

[0023] A central magnetic circuit portion, which is disposed in the accommodating groove and is spaced from the vertical portion to form the magnetic gap.

[0024] In one embodiment, there are a plurality of the vertical portions, and the plurality of vertical portions are spaced along the periphery of the bottom. A communication notch is formed between two adjacent vertical portions, and the wiring cavity communicates with the magnetic gap through the communication notch.

[0025] In one embodiment, the magnetic yoke further includes a positioning portion, which is bent and extended from one side of the vertical portion corresponding to the short axis side away from the accommodating groove, and the positioning portion abuts against and limits the vertical wall.

[0026] In one embodiment, a positioning notch is further provided on the vertical wall corresponding to the short axis side, and a positioning protrusion protrudes from the positioning portion corresponding to the positioning notch. The positioning protrusion is received and limited in the positioning notch;

[0027] And / or, a positioning table is bent and extended from one side of the flat wall corresponding to the short axis side toward the accommodating cavity, and the positioning table abuts against and positions the positioning portion.

[0028] In one embodiment, the magnetic yoke further includes a covering portion, which is bent and extended from one side of the vertical portion corresponding to the long axis side. The covering portion is opposite to and spaced from the flat wall, so that the flat wall, the vertical wall, the covering portion and the vertical portion enclose to form the wiring cavity, and the support arm is located between the flat wall and the covering portion.

[0029] In one embodiment, a positioning boss is bent from the side of the covering portion away from the vertical portion toward the flat wall, and the positioning boss abuts against and positions the support arm;

[0030] And / or, the housing further includes a limiting wall, which is bent and extended from one side of the flat wall corresponding to the long axis side toward the wiring cavity. The limiting wall is spaced from and opposite to the vertical wall and is arranged in a staggered manner with the support arm. The limiting wall, the flat wall and the vertical wall enclose to form a limiting groove. The lead is guided from the magnetic gap into the limiting groove and is supported on the support arm.

[0031] The present invention also provides an electronic device, including a device housing and the above-mentioned sound generating device, and the sound generating device is disposed in the device housing.

[0032] The sound - generating device of the technical solution of the present invention sets the housing as a metal part, and thus uses the metal part to be stamped into the housing, effectively simplifying the processing steps of the housing and reducing the cost. By setting a cavity in the housing, the magnetic circuit system and the vibration system are arranged on the housing to improve the installation stability of the magnetic circuit system and the vibration system. By providing a magnetic gap in the magnetic circuit system, connecting the diaphragm of the vibration system to the housing and being opposite and spaced from the magnetic circuit system to enclose a vibration space, one end of the voice coil is connected to the diaphragm and the other end is suspended in the magnetic gap. Thus, when an electric current is passed through the voice coil, the voice coil introduces the current into the magnetic field formed by the magnetic circuit system. Under the action of the magnetic circuit system, the voice coil drives the diaphragm to vibrate and generate sound. Further, by providing a support arm located in the cavity on the housing, when the magnetic circuit system is connected to the housing and located in the cavity, the support arm is located outside the magnetic gap, so as to guide the lead wire of the voice coil from the magnetic gap to the support arm and support it on the support arm, thereby avoiding the breakage of the lead wire of the voice coil during the vibration of the voice coil, improving the connection stability of the voice coil lead wire, and at the same time avoiding the risk of disconnection of the voice coil lead wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0034] Figure 1 Schematic diagram of the structure of the sound - generating device in an embodiment of the present invention;

[0035] Figure 2 Schematic diagram of the structure of the sound - generating device from another perspective in an embodiment of the present invention;

[0036] Figure 3 Exploded view of the sound - generating device in an embodiment of the present invention;

[0037] Figure 4 Schematic cross - sectional view of the sound - generating device along the short - axis side direction in an embodiment of the present invention;

[0038] Figure 5 Schematic cross - sectional view of the sound - generating device along the long - axis side direction in an embodiment of the present invention;

[0039] Figure 6 Schematic diagram of the structure of the housing in an embodiment of the present invention;

[0040] Figure 7 Schematic diagram of the structure of the magnetic yoke in an embodiment of the present invention.

[0041] Description of the reference numerals in the drawings:

[0042]

[0043]

[0044] The realization of the object of the present invention, its functional features and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings. Detailed implementation manners

[0045] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0046] It should be noted that all the directional indications (such as up, down, left, right, front, back,...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0047] At the same time, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three solutions. Taking "A and / or B" as an example, it includes the A solution, or the B solution, or the solution where A and B are satisfied simultaneously.

[0048] In addition, the descriptions such as "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0049] With the development of the market for portable consumer electronic products, micro sound generating devices have been widely used. And with the multi-functional and miniaturized design of portable terminal electronic products, higher requirements are put forward for the vibration acoustic performance of micro sound generators.

[0050] A sound generating device generally includes a housing, a magnetic circuit system and a vibration system received in the housing. Among them, the housing generally adopts an injection molded part or integrally injects a metal conductive part and a plastic part, resulting in a relatively large overall structure, cumbersome processing and high production costs. At the same time, the vibration system includes a diaphragm and a voice coil combined on one side of the diaphragm. Usually, the lead wire of the voice coil is electrically connected to an external circuit through a centering piece or other conductive parts, so that the energized voice coil can drive the diaphragm to vibrate under the action of the magnetic circuit system, thereby realizing the sound generation of the sound generating device. However, the lead wire of the voice coil usually adopts a suspended lead wire method to guide it to the housing and connect it to the conductive part, which is prone to the risk of wire breakage.

[0051] Based on the above concept and problems, the present invention proposes a sound generating device 100. It can be understood that the sound generating device 100 is applied to an electronic device, and the electronic device can be a mobile phone, a stereo, a computer, a headset, a watch or a television, etc., which is not limited herein.

[0052] Please refer to Figures 1 to 7 As shown, in an embodiment of the present invention, the sound generating device 100 includes a housing 1, a magnetic circuit system 2 and a vibration system 3. Among them, the housing 1 is a metal part, the housing 1 has a cavity 11, the housing 1 further has a support arm 12 located in the cavity 11, the magnetic circuit system 2 is connected to the housing 1 and is located in the cavity 11, the magnetic circuit system 2 has a magnetic gap 21, the support arm 12 is located outside the magnetic gap 21, the vibration system 3 includes a diaphragm 31 and a voice coil 32, the diaphragm 31 is connected to the housing 1 and is opposite to and spaced from the magnetic circuit system 2, one end of the voice coil 32 is connected to the diaphragm 31, and the other end is suspended in the magnetic gap 21. The voice coil 32 has a lead wire 321, and the lead wire 321 is led out from the magnetic gap 21 to the support arm 12 and supported on the support arm 12.

[0053] In this embodiment, the housing 1 is used to install, fix, support and protect components such as the vibration system 3 and the magnetic circuit system 2, that is, the housing 1 provides an installation basis for components such as the vibration system 3 and the magnetic circuit system 2. It can be understood that the housing 1 can be a structure such as an installation shell, a housing or a box body with an installation cavity, that is, the housing 1 defines a receiving space, that is, the housing 1 has a cavity 11, which is not limited herein. Optionally, the housing 1 has a rectangular structure, the housing 1 has two opposite long sides and two short sides, 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 cavity 11. The housing 1 can also be a circular structure, etc., which is adapted to different terminals.

[0054] It can be understood that the housing 1 is a metal part. By setting the housing 1 as a metal housing solution, the housing 1 can be processed by a stamping process, which can not only greatly reduce costs, but also effectively simplify the processing steps of the housing 1. In this embodiment, the magnetic circuit system 2 and the housing 1 can be fixed by bonding or welding.

[0055] In this embodiment, the cavity 11 of the housing 1 is a receiving space with openings at both ends. The magnetic circuit system 2 is connected to one end of the housing 1 and covers the opening at one end of the cavity 11. The magnetic circuit system 2 is provided with a magnetic gap 21. The vibration system 3 includes a diaphragm 31 and a voice coil 32 connected to the diaphragm 31. One end of the voice coil 32 is connected to the diaphragm 31, and the other end of the voice coil 32 is suspended in the magnetic gap 21. By introducing the current of an external circuit into the voice coil 32, the voice coil 32 transfers electrical energy into the magnetic gap 21 of the magnetic circuit system 2, so that the magnetic field generated by the magnetic circuit system 2 converts the electrical energy into mechanical energy, thereby causing the voice coil 32 to vibrate and driving the diaphragm 31 to vibrate and generate sound, and further converting the mechanical energy into sound energy.

[0056] It can be understood that after the voice coil 32 disposed in the magnetic gap 21 receives an externally changing alternating current signal, it makes a reciprocating movement of cutting the magnetic force lines under the driving of the magnetic field force of the magnetic circuit system 2, driving the diaphragm 31 of the vibration system 3 to vibrate and generate sound, thereby effectively increasing the BL value of the sound generating device 100.

[0057] It should be noted that the voice coil 32 has a lead 321, and the voice coil 32 receives an externally changing alternating current signal through the lead 321. In related technologies, usually, a conductive insert is injection-molded in a plastic housing to introduce an external current into the lead 321 of the voice coil 32 through the conductive insert; or, by providing a centering washer and other structures, the centering washer is fixed to one end of the voice coil 32 located in the magnetic gap 21, and the lead 321 is welded to the centering washer. Not only is the voice coil 32 fixed by the centering washer, but also an external current is introduced into the lead 321 of the voice coil 32 through the centering washer. However, these methods not only have high processing costs, but also have a relatively complex assembly process.

[0058] In this embodiment, by providing a support arm 12 on the metal housing 1, the support arm 12 is located in the cavity 11, and when the magnetic circuit system 2 is connected to the housing 1 and located in the cavity 11, the support arm 12 is located outside the magnetic gap 21. Thus, when the voice coil 32 is suspended in the magnetic gap 21, the lead 321 of the voice coil 32 is led out from the magnetic gap 21 to the support arm 12 and supported on the support arm 12. Thereby, the support arm 12 is used to support and fix the lead 321, avoiding breakage of the lead 321 of the voice coil 32 during the vibration of the voice coil 32, improving the connection stability of the lead 321 of the voice coil 32, and at the same time avoiding the risk of disconnection of the lead 321 of the voice coil 32. The support arm 12 is located outside the magnetic gap 21, and can also avoid the phenomenon that components such as the lead and the main body of the voice coil 32 interfere with each other during the vibration process.

[0059] The sound generating device 100 of the present invention uses a metal part as the housing 1, and the housing 1 is formed by stamping the metal part, effectively simplifying the processing steps of the housing 1 and reducing the cost. By providing a cavity 11 in the housing 1, the magnetic circuit system 2 and the vibration system 3 are arranged on the housing 1 to improve the installation stability of the magnetic circuit system 2 and the vibration system 3. By providing a magnetic gap 21 in the magnetic circuit system 2, the diaphragm 31 of the vibration system 3 is connected to the housing 1 and is opposite to and spaced from the magnetic circuit system 2 to enclose a vibration space. One end of the voice coil 32 is connected to the diaphragm 31, and the other end is suspended in the magnetic gap 21. Thus, when an electric current is passed through the voice coil 32, the voice coil 32 introduces the electric current into the magnetic field formed by the magnetic circuit system 2. Under the action of the magnetic circuit system 2, the voice coil 32 drives the diaphragm 31 to vibrate and generate sound. Further, by providing a support arm 12 in the cavity 11 on the housing 1, when the magnetic circuit system 2 is connected to the housing 1 and is located in the cavity 11, the support arm 12 is located outside the magnetic gap 21, so that the lead 321 of the voice coil 32 is led out of the magnetic gap 21 to the support arm 12 and supported by the support arm 12, thereby preventing the lead 321 of the voice coil 32 from breaking during the vibration of the voice coil 32, improving the connection stability of the lead 321 of the voice coil 32, and at the same time avoiding the risk of disconnection of the lead 321 of the voice coil 32.

[0060] In one embodiment, the diaphragm 31 includes a central portion, a surround portion surrounding the central portion, and a fixing portion provided outside the surround portion, and the fixing portion is connected to the housing 1. As Figure 1 、 Figures 3 to 5 shown, the central portion, the surround portion and the fixing portion of the diaphragm 31 are integrally formed structures. The surround portion surrounds the central portion and is located between the central portion and the fixing portion. The surround portion can be a convex structure that protrudes upward or downward. The diaphragm 31 is connected and fixed to the housing 1 of the sound generating device 100 through the fixing portion to improve the connection stability and sealing performance between the housing 1 and the diaphragm 31.

[0061] It can be understood that in order to increase the effective vibration area of the diaphragm 31, the fixing portion can be formed by extending downward or upward from the outside of the surround portion so that the fixing portion is connected and fixed to the inner side wall or the outer side wall of the housing 1.

[0062] In one embodiment, as Figure 1 、 Figures 3 to 5 shown, the central portion is provided with a hollow hole, and the vibration system 3 further includes a dome 33. The dome 33 is connected to the central portion and covers the hollow hole. It can be understood that by providing a hollow hole in the central portion of the diaphragm 31, the overall weight of the diaphragm 31 can be effectively reduced. Optionally, a hollow hole is provided at the central position of the central portion, and the hollow hole can be a through hole or a hollow hole or an opening. Optionally, the hollow hole can be one or more, which is not limited herein.

[0063] To enhance the structural strength of the diaphragm 31 and prevent the diaphragm 31 from experiencing an increased amount of shrinkage deformation during vibration, a dome 33 is provided at the central portion of the diaphragm 31. The dome 33 is connected to the central portion and covers the hollow hole. On the one hand, it enhances the structural strength of the diaphragm 31, and on the other hand, it can also prevent external impurities or dust from entering the interior of the sound generating device 100 through the hollow hole, while avoiding an increased amount of shrinkage deformation of the diaphragm 31 during vibration, thereby reducing the THD distortion of the sound generating device 100 and improving the audio effect.

[0064] In one embodiment, the support arm 12 is provided at the opposite end of the lead wire 321's lead-out position. The sound generating device 100 is provided with a wire routing cavity 17 communicating with the magnetic gap 21. After the lead wire 321 is led out from the magnetic gap 21, it is guided to the support arm 12 via the wire routing cavity 17. The support arm 12 and the lead-out position of the lead wire 321 are separated by a certain distance, ensuring that the lead wire 321 has sufficient lead-out length and further ensuring that the lead wire 321 has sufficient compliance to avoid the risk of the lead wire 321 being pulled and broken during the vibration of the voice coil 32. It can be understood that the lead-out position can be formed by providing a notch or groove in the magnetic circuit system 2 or the housing 1 for avoidance.

[0065] In one embodiment, the lead wire 321 is supported on the side of the support arm 12 facing away from the diaphragm 31. That is, the lead wire 321 is supported on the outer surface of the support arm 12. At this time, the operation of fixing the lead wire 321 is convenient and easy for assembly. The lead wire 321 can be fixed to the support arm 12 by damping glue. The damping glue is a soft glue, such as silicone, rubber, etc. This glue layer can not only fix the lead wire 321 to the support arm 12 but also ensure that the lead wire 321 has a certain degree of freedom and can buffer the vibration transmitted from the voice coil 32 to the lead wire 321.

[0066] It can be understood that the sound generating device 100 further includes a conductive member 4. The conductive member 4 is at least partially fixed to the support arm 12 and is electrically connected to the lead wire 321. The conductive member 4 can be a single component or multiple components, and can be partially fixed to the support arm 12 or entirely fixed to the support arm 12, which is convenient for electrical connection with the lead wire 321. This application does not make any limitations here, and those skilled in the art can set it flexibly according to the actual situation.

[0067] In one embodiment, the housing 1 includes a flat wall 13 and a vertical wall 14. The vertical wall 14 is formed by bending and extending from the flat wall 13. The flat wall 13 and the vertical wall 14 enclose a cavity 11. The support arm 12 is formed by bending and extending from the vertical wall 14 towards the interior of the cavity 11 and is opposite to and spaced from the flat wall 13. The magnetic circuit system 2 has a vertical portion 222 located within the cavity 11. The vertical portion 222 is located inside the vertical wall 14 and is spaced from the vertical wall 14 to cooperate to form a wire routing cavity 17. The support arm 12 is located within the wire routing cavity 17. Among them, the lead wire 321 is led out from the magnetic gap 21 into the wire routing cavity 17 and is supported on the support arm 12.

[0068] In this embodiment, as Figures 1 to 6 shown, the housing 1 has a square frame structure. The housing 1 includes a flat wall 13 and a vertical wall 14 arranged at an angle. Optionally, the vertical wall 14 is bent and extended from one side of the flat wall 13, and the vertical wall 14 is perpendicular to the flat wall 13 to enclose a cavity 11. The support arm 12 is arranged at one end of the vertical wall 14 away from the flat wall 13. Optionally, the support arm 12 is bent and extended from the vertical wall 14 towards the inside of the cavity 11 and is opposite and spaced from the flat wall 13.

[0069] It can be understood that the side of the flat wall 13 facing away from the vertical wall 14 is fixedly connected to the fixing part of the diaphragm 31. Optionally, the flat wall 13 and the fixing part of the diaphragm 31 are fixedly connected by bonding. When the magnetic circuit system 2 is installed in the cavity 11, the vertical part 222 of the magnetic circuit system 2 is located inside the vertical wall 14 and is spaced from the vertical wall 14 to form a wiring cavity 17. Thus, the wiring cavity 17 can be used to limit the wiring of the lead 321 and also make the wiring cavity 17 spaced from the magnetic gap 21, thereby further preventing the lead 321 from affecting the vibration of the voice coil 32.

[0070] It should be noted that in order to ensure that the lead 321 has a certain movement space during the vibration of the voice coil 32, the support arm 12 and the lead-out position of the lead 321 are spaced apart by a certain distance. One end of the lead 321 connected to the voice coil 32 is located in the magnetic gap 21, and when it is led out from the magnetic gap 21 into the wiring cavity 17 and supported on the support arm 12, that is, a section of the lead 321 from before it is supported on the support arm 12 to the lead 321 is suspended. In this way, during the vibration of the voice coil 32, the lead 321 vibrates with the voice coil 32, effectively preventing the lead 321 from breaking due to its connection with the support arm 12.

[0071] It can be understood that there is a certain distance between the lead 321 from the lead-out position to the support arm 12 to ensure that the lead 321 can move. At the same time, in order to prevent the lead 321 from swinging during the vibration with the voice coil 32 and affecting the acoustic performance of the sound generating device 100, one end of the lead 321 originally connected to the voice coil 32 is supported and fixed on the support arm 12 to reduce the length of the lead 321 in the suspended state, thereby effectively preventing the lead 321 from swinging during the vibration with the voice coil 32 and affecting the acoustic performance of the sound generating device 100.

[0072] In this embodiment, in order to prevent the lead 321 from being completely immovable when connected to the support arm 12, which may cause the lead 321 to break due to the rigid connection between the lead 321 and the support arm 12 during the vibration of the voice coil 32, the lead 321 and the support arm 12 are connected by an adhesive layer. Optionally, the adhesive layer is a damping adhesive, and the damping adhesive is a soft adhesive, such as silicone, rubber, etc. This adhesive layer can not only fix the lead 321 to the support arm 12, but also ensure that the lead 321 has a certain degree of freedom to buffer the vibration transmitted from the voice coil 32 to the lead 321.

[0073] In one embodiment, the support arm 12 includes a connected platform portion 121 and an inclined portion 122. The platform portion 121 is connected to the vertical wall 14, and the inclined portion 122 extends obliquely from the platform portion 121 into the wire routing cavity 17; the sound generating device 100 further includes a conductive member 4, and the conductive member 4 is disposed on the platform portion 121. The lead 321 is supported by the support arm 12 and connected to the conductive member 4.

[0074] In this embodiment, as Figure 2 、 Figure 3 and Figure 6 shown, by setting the support arm 12 as the connected platform portion 121 and inclined portion 122, the platform portion 121 is connected to the vertical wall 14, that is, the platform portion 121 is bent and extended from the vertical wall 14, and the inclined portion 122 is extended from one end of the platform portion 121 into the wire routing cavity 17.

[0075] Optionally, the inclined portion 122 extends obliquely from the platform portion 121 into the wire routing cavity 17, that is, the inclined portion 122 extends along the wire routing cavity 17 from the platform portion 121 and extends toward the end where the lead 321 is connected to the voice coil 32, that is, the inclined portion 122 can be optionally suspended. It can be understood that by setting the inclined portion 122 as an inclined structure, the lead 321 can be guided to the platform portion 121 more gently, avoiding sharp bends of the lead 321 and ensuring the compliance of the lead 321.

[0076] It can be understood that the platform portion 121 of the support arm 12 is located at the end of the vertical wall 14 away from the end where the lead 321 is connected to the voice coil 32. By setting the platform portion 121, the conductive member 4 can be installed and fixed by using the platform portion 121 to ensure the connection stability between the conductive member 4 and the lead 321. In this embodiment, after the lead 321 is connected to the conductive member 4, in order to ensure the connection stability and avoid breakage, resulting in unsmooth conduction, the lead 321 is fixed at the end near the platform portion 121 on the inclined portion 122 to ensure the connection stability between the lead 321 and the conductive member 4.

[0077] Optionally, the distance from the inclined portion 122 to the straight wall 13 gradually decreases from one end adjacent to the platform portion 121 to the other end away from the platform portion 121. It can be understood that one end of the lead 321 adjacent to the conductive member 4 is connected to the inclined portion 122 through an adhesive layer, and the adhesive layer can be a damping adhesive.

[0078] In this embodiment, the lead 321 is connected to the side of the inclined portion 122 facing away from the straight wall 13, and the conductive member 4 is fixed to the side of the platform portion 121 facing away from the straight wall 13. Optionally, the conductive member 4 is an FPCB. The conductive member 4 can be fixed to the platform portion 121 by bonding.

[0079] In one embodiment, as Figure 3 shown, the voice coil 32 has a long axis side 322 and a short axis side 323 connected end to end. Optionally, the voice coil 32 is a rectangular ring structure, that is, the two long axis sides 322 and the two short axis sides 323 of the voice coil 32 are alternately connected to form a ring structure connected end to end. In order to ensure that an external current is passed into the voice coil 32, the voice coil 32 has two leads 321, that is, the voice coil 32 has an input lead and an output lead, which facilitates introducing the external current into the voice coil 32 from the input lead of the voice coil 32 through the conductive member 4, leading the current out of the voice coil 32 from the output lead to the conductive member 4, and inputting it into the external circuit.

[0080] Optionally, the two leads 321 can be respectively arranged on the two long axis sides 322 or the two short axis sides 323 of the voice coil 32. In this embodiment, as Figure 3 shown, the lead 321 includes two, and each lead 321 is arranged corresponding to a long axis side 322.

[0081] In this embodiment, as Figure 3 and Figure 6 shown, the vertical wall 14 is bent and extended corresponding to each long axis side 322 to form a support arm 12, and the vertical portion 222 and the vertical wall 14 form a wiring cavity 17 corresponding to each long axis side 322; wherein, each lead 321 is led out from the magnetic gap 21 into a wiring cavity 17 and supported by a support arm 12.

[0082] It can be understood that one end of the lead 321 is located on the long axis side 322 of the voice coil 32, and the vertical wall 14 is bent and extended corresponding to the other end of the long axis side 322 to form a support arm 12. In this embodiment, the number of support arms 12 and the number of wiring cavities 17 are the same as the number of leads 321.

[0083] It should be noted that when the leads 321 are arranged on the two long axis sides 322 of the voice coil 32, the support arms 12 and the wiring cavities 17 are arranged corresponding to the long axis sides 322 of the voice coil 32. When the leads 321 are arranged on the two short axis sides 323 of the voice coil 32, the support arms 12 and the wiring cavities 17 are arranged corresponding to the short axis sides 323 of the voice coil 32, which is not limited herein.

[0084] In one embodiment, the magnetic circuit system 2 includes a magnetic yoke 22 and a central magnetic circuit portion 23. The magnetic yoke 22 includes a bottom 221 and a vertical portion 222 provided at the periphery of the bottom 221. The vertical portion 222 and the bottom 221 enclose a receiving groove 223. The central magnetic circuit portion 23 is disposed in the receiving groove 223 and is spaced from the vertical portion 222 to form a magnetic gap 21.

[0085] In this embodiment, as Figures 2 to 5 、 Figure 7 shown, the magnetic yoke 22 can be selected as a magnetic plate or a magnetic basin frame structure, etc., and is not limited herein. The magnetic yoke 22 is used to support and fixedly install the central magnetic circuit portion 23. The magnetic circuit system 2 is fixedly connected to the housing 1 through the magnetic yoke 22. Optionally, the magnetic yoke 22 is adhesively connected to the central magnetic circuit portion 23, and the magnetic yoke 22 is adhesively connected to the housing 1.

[0086] It can be understood that by setting the magnetic yoke 22 as the bottom 221 and the vertical portion 222, the vertical portion 222 is provided at the periphery of the bottom 221, so that the vertical portion 222 and the bottom 221 enclose a receiving groove 223. In this way, while the receiving groove 223 can be used to install and fix the central magnetic circuit portion 23, the central magnetic circuit portion 23 is spaced from the vertical portion 222 to form a magnetic gap 21.

[0087] Optionally, the central magnetic circuit portion 23 includes a central magnet 231 and a central washer 232 stacked. The central magnet 231 is disposed between the central washer 232 and the bottom 221 of the magnetic yoke 22. The central magnet 231 and the central washer 232 are spaced from the vertical portion 222 to form a magnetic gap 21.

[0088] It can be understood that the central washer 232 can be selected as a magnetic plate structure. The central magnet 231 and the central washer 232 have the same structural contour. The central magnet 231 and the central washer 232 can be selected as a plate-like structure or a ring-like structure, and are not limited herein.

[0089] In this embodiment, the vertical portion 222 can be an annular structure. The annular vertical portion 222 surrounds the central magnetic circuit portion 23 and is spaced from the central magnetic circuit portion 23 to form an annular magnetic gap 21. Optionally, the vertical portion 222 can be circular, or polygonal such as quadrilateral, pentagonal, hexagonal, etc.

[0090] In one embodiment, as Figure 3 and Figure 7 shown, the vertical portion 222 includes a plurality of them. The plurality of vertical portions 222 are spaced along the periphery of the bottom 221. A communication gap 224 is formed between two adjacent vertical portions 222. The wire routing cavity 17 is communicated with the magnetic gap 21 through the communication gap 224.

[0091] It can be understood that the lead wire 321 is connected at the connection of the long-axis side 322 and the short-axis side 323 of the voice coil 32. Thus, by setting the communication gap 224, it is convenient for the lead wire 321 to pass through the communication gap 224 from within the magnetic gap 21 and be led out into the wiring cavity 17. In this embodiment, the vertical portion 222 has a long side opposite to the long-axis side 322 and a short side opposite to the short-axis side 323, and the communication gap 224 is formed at the adjacent position of the long side and the short side of the vertical portion 222.

[0092] In one embodiment, as Figure 2 , Figure 3 , Figure 5 and Figure 7 shown, the magnetic yoke 22 further includes a positioning portion 225. The positioning portion 225 is bent and extended from the side of the vertical portion 222 corresponding to the short-axis side 323 toward the side away from the accommodating groove 223, and the positioning portion 225 abuts against and limits the vertical wall 14. It can be understood that by providing the positioning portion 225 on the magnetic yoke 22, the magnetic yoke 22 is connected and fixed to the vertical wall 14 of the housing 1 through the positioning portion 225.

[0093] Optionally, the positioning portion 225 abuts against and limits the vertical wall 14, and is fixedly connected together by gluing or welding.

[0094] In one embodiment, as Figure 3 , Figure 5 and Figure 7 shown, the vertical wall 14 is also provided with a positioning notch 141 corresponding to the short-axis side 323. The positioning portion 225 is convexly provided with a positioning protrusion 226 corresponding to the positioning notch 141, and the positioning protrusion 226 is received and limited within the positioning notch 141. It can be understood that by setting it in this way, the positioning and installation of the magnetic circuit system 2 and the housing 1 can be realized through the cooperation of the positioning protrusion 226 and the positioning notch 141, ensuring that the wiring cavity 17 formed by the cooperation of the vertical portion 222 of the magnetic circuit system 2 and the vertical wall 14 of the housing 1 is symmetrically arranged to ensure the performance of the sound generating device 100.

[0095] In one embodiment, as Figure 3 , Figure 5 and Figure 7 shown, one side of the flat wall 13 corresponding to the short-axis side 323 is bent and extended toward the inside of the cavity 11 to form a positioning table 15, and the positioning table 15 abuts against and positions the positioning portion 225. It can be understood that by setting it in this way, the positioning portion 225 can be supported and fixed by the positioning table 15, and the positioning effect of the positioning table 15 can be ensured. Optionally, the protruding thickness or bending length of the positioning table 15 is the same as the protruding thickness or bending length of the positioning protrusion 226.

[0096] In one embodiment, the magnetic yoke 22 further includes a covering portion 227 which is formed by bending and extending from one side of the vertical portion 222 corresponding to the major axis side 322. The covering portion 227 faces and is spaced from the flat wall 13, so that the flat wall 13, the vertical wall 14, the covering portion 227 and the vertical portion 222 enclose a wire routing cavity 17, and the support arm 12 is located between the flat wall 13 and the covering portion 227.

[0097] In this embodiment, as Figure 2 , Figure 3 , Figure 4 and Figure 7 shown, by providing the covering portion 227 on the magnetic yoke 22, the opening of the wire routing cavity 17 is covered by the covering portion 227, so as to shield the lead 321 while protecting the lead 321, which can improve the aesthetic performance and adjust the airflow in the vibration space through the covering portion 227 to control the acoustic performance of the sound generating device 100.

[0098] It can be understood that the covering portion 227 is formed by bending and extending from one side of the vertical portion 222 corresponding to the major axis side 322. Optionally, the covering portion 227 is flush with the bottom portion 221, and at this time the covering portion 227 is formed by continuously bending the vertical portion 222. Optionally, the bottom portion 221, the vertical portion 222 and the covering portion 227 of the magnetic yoke 22 are of an integrally formed structure, that is, they are processed and formed by stamping or continuous bending process. The bottom portion 221, the vertical portion 222 and the positioning portion 225 of the magnetic yoke 22 are of an integrally formed structure, that is, they are processed and formed by stamping or continuous bending process, which is not limited herein.

[0099] In one embodiment, as Figure 2 , Figure 3 , Figure 4 and Figure 7 shown, one side of the covering portion 227 away from the vertical portion 222 is bent towards the flat wall 13 to form a positioning boss 228, and the positioning boss 228 abuts against and positions the support arm 12. It can be understood that by providing the positioning boss 228, the magnetic yoke 22 is supported and limited by the positioning boss 228, improving the connection stability and installation positioning effect of the magnetic yoke 22 and the housing 1.

[0100] In one embodiment, as Figure 3 , Figure 4 and Figure 6 described, the housing 1 further includes a limiting wall 16 which is formed by bending and extending from one side of the flat wall 13 corresponding to the major axis side 322 towards the inside of the wire routing cavity 17. The limiting wall 16 is spaced from and opposite to the vertical wall 14, and is arranged in a staggered manner with the support arm 12. The limiting wall 16, the flat wall 13 and the vertical wall 14 enclose a limiting groove, and the lead 321 is led out from the magnetic gap 21 into the limiting groove and supported on the support arm 12.

[0101] Understandably, the provision of the limiting wall 16 can effectively limit the lead 321 from passing through the magnetic gap 21 and being introduced into the wiring cavity 17 through the communication notch 224. Optionally, the limiting wall 16 is formed by bending and extending from one side of the straight wall 13 corresponding to the long axis side 322 towards the inside of the wiring cavity 17, such that the limiting wall 16 is spaced and opposite to the vertical wall 14, so that the limiting wall 16, the straight wall 13 and the vertical wall 14 enclose a limiting groove. In this way, when the lead 321 passes through the communication notch 224 from the magnetic gap 21 and is introduced into the wiring cavity 17, it is limited within the limiting groove and is led out to the inclined portion 122 of the support arm 12 via the limiting groove.

[0102] Optionally, the limiting wall 16 and the support arm 12 are arranged in a staggered manner, that is, the projection of the limiting wall 16 on the vertical wall 14 does not coincide with the projection of the support arm 12 on the vertical wall 14.

[0103] In one embodiment, the magnetic yoke 22 is provided with ventilation holes, and the sound generating device 100 further includes a metal mesh, which is provided on the side of the magnetic yoke 22 facing away from the housing 1 and covers the ventilation holes.

[0104] In this embodiment, the diaphragm 31, the housing 1 and the magnetic circuit system 2 enclose a vibration space. In order to balance the pressure inside and outside the vibration space of the sound generating device 100, ventilation holes are provided in the magnetic yoke 22, so that the ventilation holes communicate with the external atmosphere. In this way, when the voice coil 32 drives the diaphragm 31 to vibrate, the atmospheric pressure inside and outside the vibration space can be balanced through the ventilation holes to ensure the acoustic performance of the sound generating device 100.

[0105] Understandably, by providing the metal mesh, the metal mesh is provided on the side of the magnetic yoke 22 facing away from the housing 1 and covers the ventilation holes. In this way, when the sound generating device 100 is installed in an electronic device, sound-absorbing materials can be filled to further improve the sound generation effect and acoustic performance. The provision of the metal mesh effectively prevents the sound-absorbing materials from entering the interior of the sound generating device 100 through the ventilation holes and affecting the sound generation effect of the sound generating device 100.

[0106] In one embodiment, the vibration system 3 further includes a centering washer, which includes an outer fixing portion, an inner fixing portion and an elastic portion connecting the outer fixing portion and the inner fixing portion. The outer fixing portion is connected to the housing 1, and the inner fixing portion is connected to the voice coil 32.

[0107] In this embodiment, by providing the centering washer, the outer fixing portion of the centering washer is connected to the housing 1, and the inner fixing portion of the centering washer is connected to the voice coil 32, so as to balance and stabilize the vibration of the voice coil 32 driving the diaphragm 31 by using the centering washer, and avoid the phenomenon that the voice coil 32 drives the diaphragm 31 to swing or polarize.

[0108] In this embodiment, the centering support piece is optionally made of PI material. In this way, the centering support piece can be made thinner to save material and installation space, thereby effectively increasing the volume of the magnetic circuit system 2 and improving the BL value of the product. Optionally, the centering support piece can adopt a single-layer structure. Of course, in other embodiments, the centering support piece can also adopt a multi-layer structure to form a composite structure, which is not limited herein. Optionally, the thickness of the centering support piece is greater than or equal to 0.0125 mm.

[0109] In order to further increase the elongation rate of the centering support piece, in one embodiment, the elastic part includes two elastic arms and a bending part connecting the two elastic arms. The bending part and the two elastic arms enclose an elastic space 336, and the ends of the two elastic arms far from the bending part are respectively connected to the outer fixing part and the inner fixing part.

[0110] It can be understood that such a setting can effectively increase the arm length of the elastic part and improve the stretching and elastic deformation performance of the centering support piece. It should be noted that when the centering support piece is set in this way in the static state, the elastic arms of the centering support piece can be made very short, so that there is more space to expand the size of the magnet in the magnetic circuit system 2 and improve the product performance.

[0111] Optionally, the centering support piece can be composed of one or more layers of materials. When the centering support piece uses a single layer of material, the material hardness and thickness can be selected according to the length of the elastic part. In contrast, when the centering support piece uses multiple layers of materials, each layer of material can use a material with a smaller elastic modulus. Due to the flexible design of the centering support piece, it is helpful to select a design scheme with a light centering support piece quality, which is beneficial to the product performance.

[0112] In one embodiment, there are multiple centering support pieces, and the magnetic circuit system 2 is provided with multiple communication gaps 224 communicating with the magnetic gap 21, and each centering support piece is correspondingly arranged with a communication gap 224.

[0113] In this embodiment, the centering support piece includes an outer fixing part, an inner fixing part, and an elastic part connected between the outer fixing part and the inner fixing part. The outer fixing part is connected to the housing 1, and the inner fixing part is connected to the side of the voice coil 32 facing away from the diaphragm 31.

[0114] It can be understood that the centering support piece can be a large integral structure. The outer fixing part can be selected as an annular structure and connected to the housing 1. The inner fixing part is connected to one end of the voice coil 32 facing away from the diaphragm 31. The inner fixing part is connected to the outer fixing part through the elastic part. In this way, when the voice coil 32 vibrates, the inner fixing part drives the elastic part to deform to avoid the voice coil 32 driving the diaphragm 31 to swing or polarize.

[0115] Of course, in other embodiments, the centering support piece may also be multiple small components. For example, the centering support piece includes two or four. When there are two centering support pieces, the two centering support pieces are symmetrically arranged, symmetrically arranged and connected to two short axes or two long axes of the housing 1, which is not limited herein. When there are four centering support pieces, the four centering support pieces are respectively arranged at four corner positions of the housing 1, so as to ensure symmetry and thus ensure the balance of the vibration of the voice coil 32 of the sound generating device 100. Optionally, the centering support piece includes four, and the four centering support pieces are arranged corresponding to four communication notches 224 of the magnetic circuit system 2.

[0116] The present invention also provides an electronic device, which includes a device housing 1 and the above-mentioned sound generating device 100, and the sound generating device 100 is arranged in the device housing 1. The specific structure of the sound generating device 100 refers to the foregoing embodiments. Since this electronic device adopts all the technical solutions of all the foregoing embodiments, it at least has all the beneficial effects brought by the technical solutions of the foregoing embodiments, which will not be elaborated herein one by one.

[0117] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent structural transformations made under the concept of the present invention by using the content of the specification and drawings of the present invention, 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: A shell, the shell is a metal part, the shell has a cavity, and the shell is also provided with a support arm located in the cavity; A magnetic circuit system, the magnetic circuit system is connected to the housing and is located in the cavity, the magnetic circuit system is provided with a magnetic gap, and the support arm is located outside the magnetic gap; and A vibration system, the vibration system comprising a diaphragm and a voice coil, the diaphragm being connected to the housing and being opposite to and spaced from the magnetic circuit system, one end of the voice coil being connected to the diaphragm and the other end being suspended in the magnetic gap, the voice coil having a lead wire, the lead wire being led out from the magnetic gap to the support arm and supported by the support arm; In which, the shell includes a flat wall and a vertical wall, the vertical wall is formed by bending and extending the flat wall, the flat wall and the vertical wall enclose a cavity, the support arm is formed by bending and extending the vertical wall toward the cavity, and the straight walls are opposite and spaced apart; the magnetic circuit system has a vertical portion located in the cavity, the vertical portion is located on the inner side of the vertical wall, and is spaced apart from the vertical wall to cooperate to form a wiring cavity, and the support arm is located in the wiring cavity; the lead wire is led out from the magnetic gap into the wiring cavity and is supported by the support arm.

2. The sound generating device according to claim 1, wherein The support arm comprises a platform portion and an inclined portion connected to each other, the platform portion is connected to the vertical wall, and the inclined portion extends obliquely from the platform portion toward the wiring cavity; The sound-generating device further includes a conductive member, which is disposed on the platform portion. The lead wire is guided to the platform portion via the inclined portion and is connected to the conductive member.

3. The sound generating device according to claim 2, wherein The distance between the inclined portion and the straight wall gradually decreases from an end adjacent to the platform portion to an end away from the platform portion; And / or, one end of the lead wire adjacent to the conductive member is connected to the inclined portion through an adhesive layer, and the adhesive layer is a damping adhesive; And / or, the conductive member is a FPCB.

4. The sound generating device according to claim 1, characterized in that, The voice coil has a long axis side and a short axis side connected end to end; The lead wires include two, each of which is arranged corresponding to one of the long axis sides; The vertical wall is bent and extended corresponding to each of the long axis sides to form a support arm, and the vertical portion and the vertical wall are corresponding to each of the long axis sides to form a wiring cavity; Wherein, each of the lead wires is led out from the magnetic gap into a wiring cavity and supported by a support arm.

5. The sound generating device according to claim 4, wherein The magnetic circuit system comprises: A magnetically conductive yoke, the magnetically conductive yoke comprising a bottom and the vertical portion provided at the periphery of the bottom, the vertical portion and the bottom enclosing a receiving groove; and A central magnetic circuit portion is disposed in the accommodating groove and is spaced apart from the vertical portion to form the magnetic gap.

6. The sound generating device according to claim 5, wherein, The vertical parts include a plurality of vertical parts, which are arranged at intervals along the periphery of the bottom, and two adjacent vertical parts form a connecting gap, and the wiring cavity is connected with the magnetic gap through the connecting gap.

7. The sound generating device according to claim 5, wherein, The magnetic yoke further includes a positioning portion, which is formed by bending and extending a side of the vertical portion corresponding to the short axis side toward and away from the accommodating groove, and the positioning portion abuts against the vertical wall for limiting position.

8. The sound generating device according to claim 7, characterized in that, The vertical wall is further provided with a positioning notch corresponding to the short-axis side, and the positioning portion is convexly provided with a positioning protrusion corresponding to the positioning notch, and the positioning protrusion is received and limited within the positioning notch; And / or, one side of the flat wall corresponding to the short-axis side is bent and extended towards the accommodating cavity to form a positioning table, and the positioning table is in butt joint and positioning with the positioning portion.

9. The sound generating device according to claim 5, wherein, The magnetic yoke further includes a covering portion, and the covering portion is formed by bending and extending from one side of the vertical portion corresponding to the long-axis side. The covering portion is opposite and spaced from the flat wall, so that the flat wall, the vertical wall, the covering portion and the vertical portion cooperate to form the wire routing cavity, and the support arm is located between the flat wall and the covering portion.

10. The sound generating device according to claim 9, characterized in that, One side of the covering portion away from the vertical portion is bent towards the flat wall to form a positioning boss, and the positioning boss is in butt joint and positioning with the support arm; And / or, the housing further includes a limiting wall, and the limiting wall is formed by bending and extending from one side of the flat wall corresponding to the long-axis side towards the wire routing cavity. The limiting wall is spaced and opposite to the vertical wall and is arranged in a dislocation manner with the support arm. The limiting wall, the flat wall and the vertical wall enclose a limiting groove, and the lead wire is led out from the magnetic gap into the limiting groove and supported on the support arm.

11. An electronic device, characterized in that, It includes an equipment housing and the sound generating device according to any one of claims 1 to 10, and the sound generating device is arranged in the equipment housing.

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