Sound production device and electronic equipment

Abstract

The invention discloses a sound production device and electronic equipment. The sound production device comprises a device shell, a voice coil and a vibration assembly, wherein the voice coil and the vibration assembly are arranged in an inner cavity of the device shell; the vibration assembly comprises a first magnet, a second magnet and an elastic base, and the elastic base divides the inner cavity into a front cavity and a rear cavity which are isolated from each other; the first magnet and the second magnet are arranged on the elastic base, the first magnet is arranged around the second magnet, and a magnetic gap is formed between the first magnet and the second magnet; the first end of the voice coil is connected with the device shell, the second end of the voice coil extends into the magnetic gap, and the voice coil is used for driving the vibration assembly to vibrate through magnetic cooperation between the voice coil and the first magnet and the second magnet when the voice coil is powered on. According to the scheme, the problem that the design feasibility is poor due to the fact that the volume of the rear cavity is enlarged or the rear cavity is filled with the sound absorption particles in the sound production device related to the related technology can be solved.

Description

Technical Field

[0001] The present application belongs to the technical field of electronic equipment design, and specifically relates to a sound-generating device and an electronic equipment. Background Art

[0002] At present, electronic devices (such as mobile phones, tablet computers, etc.) are usually equipped with sound devices (such as speakers, receivers). As user needs increase, users have higher and higher requirements for the performance of electronic devices, and accordingly, users have higher and higher requirements for the sound performance of electronic devices. How to improve the sound performance of the sound device in the electronic device is the design focus of the designer.

[0003] Low-frequency performance is a relatively important performance of a sound-generating device, and is related to the compliance of the diaphragm and the volume of the back cavity. Specifically, the better the compliance of the diaphragm and the larger the volume of the back cavity, the lower the resonance frequency of the sound-generating device and the better the corresponding low-frequency performance.

[0004] However, as electronic devices become thinner and thinner, the internal space of electronic devices becomes more and more cramped. Limited by the internal space of electronic devices, the volume of the back cavity of the sound-emitting device becomes smaller and smaller, resulting in poor low-frequency performance of the sound-emitting device. In order to solve this problem, electronic devices in the related art generally expand the volume of the back cavity or fill the back cavity with sound-absorbing particles to achieve the purpose of improving low-frequency performance. However, since the internal space of electronic devices is relatively cramped, it becomes more difficult to expand the volume of the back cavity, and there is a problem of poor design feasibility. In addition, filling the back cavity with sound-absorbing particles has the problem of high cost, and there is also a problem of poor design feasibility. Summary of the invention

[0005] The invention discloses a sound-generating device and an electronic device, so as to solve the problem that the sound-generating device involved in the related art has poor design feasibility by enlarging the volume of a rear cavity or filling sound-absorbing particles in the rear cavity.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: In a first aspect, the present application discloses a sound-generating device, the disclosed sound-generating device comprising a device housing, and a voice coil and a vibration assembly disposed in an inner cavity of the device housing; The vibration assembly comprises a first magnet, a second magnet and an elastic base, wherein the elastic base divides the inner cavity into a front cavity and a rear cavity which are isolated from each other; The first magnet and the second magnet are arranged on the elastic base, the first magnet is arranged around the second magnet, and a magnetic gap is formed between the first magnet and the second magnet; The first end of the voice coil is connected to the device housing, and the second end of the voice coil extends into the magnetic gap. The voice coil is used to drive the vibration component to vibrate through magnetic cooperation with the first magnet and the second magnet when power is supplied.

[0007] In a second aspect, the present application discloses an electronic device, which includes a device housing and the sound-generating device described in the first aspect, wherein the sound-generating device is disposed in the device housing.

[0008] The technical solution adopted by the present invention can achieve the following technical effects: The sound-generating device disclosed in the embodiment of the present application uses the first magnet and the second magnet with larger mass as part of the vibration component, so as to interact with the voice coil to realize vibration sound generation while improving the low-frequency performance of the sound-generating device. This structure does not need to expand the volume of the back cavity, nor does it need to fill the back cavity with relatively expensive sound-absorbing particles. Therefore, the sound-generating device disclosed in the embodiment of the present application can solve the problem of poor design feasibility of the sound-generating device described in the background technology by expanding the volume of the back cavity or filling the back cavity with sound-absorbing particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a cross-sectional view of a sound-generating device disclosed in an embodiment of the present invention; Figure 2 is a cross-sectional view of another sound-generating device disclosed in an embodiment of the present invention; Figure 3 It is a schematic diagram of an electronic device disclosed in an embodiment of the present invention.

[0010] Description of reference numerals: 10-device housing, 11-top wall, 12-bottom wall, 13-enclosure, 20-Voice coil, 30-vibration component, 31-first magnet, 32-second magnet, 321-avoidance hole, 33-elastic base, 331-elastic connector, 332-rigid seat body, 40-elastic reset piece, 41-flanging, 01-inner cavity, 011-front cavity, 012-back cavity, 02-magnetic gap, 03-sound hole, 001-sound-generating device, 002-equipment housing. DETAILED DESCRIPTION

[0011] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. 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.

[0012] The terms "first", "second", etc. in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same type, and the number of objects is not limited. For example, the first object can be one or more.

[0013] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0014] Please refer to Figures 1 to 3 The embodiment of the present application discloses a sound-generating device 001, and the disclosed sound-generating device 001 can be applicable to electronic devices. The disclosed sound-generating device 001 can be a speaker or a receiver, and the embodiment of the present invention does not limit the specific type of the sound-generating device 001. The sound-generating device 001 disclosed in the embodiment of the present invention can include a device housing 10, a voice coil 20, and a vibration component 30.

[0015] The device housing 10 is the outer shell of the sound-generating device 001. The device housing 10 can not only provide a direct or indirect installation basis for other components of the sound-generating device 001, but also can realize the installation of the sound-generating device 001 in the electronic device by cooperating with the device housing 002 of the electronic device. In the embodiment of the present invention, the device housing 10 has an inner cavity 01, and the voice coil 20 and the vibration assembly 30 are arranged in the inner cavity 01 of the device housing 10. The device housing 10 can also provide peripheral protection for the voice coil 20 and the vibration assembly 30.

[0016] The voice coil 20 is the power source of the sound-generating device 001, and the voice coil 20 is essentially an energized coil. When the sound-generating device 001 is working, the voice coil 20 receives an electrical signal, so that the voice coil 20 is energized and generates a magnetic field. In an embodiment of the present invention, the voice coil 20 is connected to the device housing 10. Specifically, the first end of the voice coil 20 is connected to the device housing 10. In one embodiment, the first end of the voice coil 20 can be fixedly connected to the device housing 10 by bonding, connecting with a connector, etc.

[0017] The vibration component 30 is a component that needs to vibrate when the sound-generating device 001 is working. Specifically, the vibration component 30 vibrates relative to the device housing 10, and the vibration of the vibration component 30 can drive the air to vibrate, thereby generating sound. The mechanism of sound generation is a well-known technology and will not be repeated here. In an embodiment of the present invention, the vibration component 30 includes a first magnet 31, a second magnet 32 ​​and an elastic base 33. The elastic base 33 provides an installation position for the first magnet 31 and the second magnet 32, and at the same time, the elastic base 33 also performs a separation function. Specifically, the elastic base 33 separates the inner cavity 01 into a front cavity 011 and a rear cavity 012 that are isolated from each other. The front cavity 011 and the rear cavity 012 are isolated from each other, thereby preventing the air in the front cavity 011 from contacting the air in the rear cavity 012 and causing a sound short circuit.

[0018] The first magnet 31 and the second magnet 32 ​​are arranged on the elastic base 33. Specifically, the first magnet 31 and the second magnet 32 ​​can be fixed on the elastic base 33 by bonding, clamping, etc. The first magnet 31 is arranged around the second magnet 32, and a magnetic gap 02 is formed between the first magnet 31 and the second magnet 32. The second end of the voice coil 20 extends into the magnetic gap 02, and the voice coil 20 is used to drive the vibration component 30 to vibrate through the magnetic cooperation between the first magnet 31 and the second magnet 32 ​​when power is turned on. It should be noted that the first end of the voice coil 20 and the second end of the voice coil 20 are two opposite ends of the voice coil 20. In one embodiment, the magnetic gap 02 can be an annular space.

[0019] As mentioned above, the voice coil 20 generates a magnetic field after being energized, so that the first magnet 31 and the second magnet 32 ​​are both located in the magnetic field generated by the voice coil 20 and are driven by the magnetic force. The elastic base 33 is elastic, so that after the first magnet 31 and the second magnet 32 ​​are subjected to the reciprocating magnetic force, it can vibrate reciprocatingly with them, thereby realizing the sound of the sound-generating device 001.

[0020] The vibration component 30 of the sound-generating device 001 disclosed in the embodiment of the present invention can be simplified as a harmonic oscillator model. The calculation method of the resonance frequency f0 of the harmonic oscillator model is as follows:

[0021] According to the formula, Mis the mass of the resonator, which is equivalent to the mass of the vibration component 30 in this application, K is the elastic coefficient. When the material and structure of the elastic base 33 are determined, the elastic coefficient is a constant. It can be seen that the resonant frequency of the harmonic oscillator model is inversely correlated with the mass of the vibration component 30. In the sound-generating device 001 disclosed in the embodiment of the present invention, the mass of the voice coil 20 is small, while the mass of the first magnet 31 and the second magnet 32 ​​is large. Therefore, the mass of the vibration component 30 including the first magnet 31 and the second magnet 32 ​​is large. It can be seen from the above formula that the sound-generating device 001 disclosed in the embodiment of the present application uses the structure including the first magnet 31 and the second magnet 32 ​​as the vibration component 30, which can improve the mass of the vibration component 30 and make the resonant frequency of the sound-generating device 001 lower. The lower the resonant frequency, the better the low-frequency performance of the sound-generating device 001. It can be seen that the sound-generating device 001 disclosed in the embodiment of the present invention can improve the low-frequency performance.

[0022] Through the above analysis, it can be known that the sound-generating device 001 disclosed in the embodiment of the present invention uses the first magnet 31 and the second magnet 32 ​​with larger mass as part of the vibration component 30, so as to interact with the voice coil 20 to realize vibration sound generation while improving the low-frequency performance of the sound-generating device 001. This structure does not need to expand the volume of the back cavity, nor does it need to fill the back cavity with relatively expensive sound-absorbing particles. Therefore, the sound-generating device 001 disclosed in the embodiment of the present invention can solve the problem of poor design feasibility of the sound-generating device described in the background technology by expanding the volume of the back cavity or filling the back cavity with sound-absorbing particles.

[0023] As described above, in the specific working process of the sound-generating device 001, since the vibration assembly 30 includes the first magnet 31 and the second magnet 32 ​​with large mass, the vibration inertia of the vibration assembly 30 is large. In order to prevent the second end of the voice coil 20 from being separated from the magnetic gap 02 and affecting the magnetic cooperation between the voice coil 20 and the vibration assembly 30, the sound-generating device 001 disclosed in the embodiment of the present invention may also include an elastic reset member 40. The elastic reset member 40 connects the vibration assembly 30 and the device housing 10, and the elastic reset member 40 is used to drive the vibration assembly 30 to reset. In the specific sound-generating process, as the vibration assembly 30 is subjected to force and vibrates, the elastic reset member 40 deforms following the vibration of the vibration assembly 30, and drives the vibration assembly 30 to reset, thereby avoiding excessive vibration of the vibration assembly 30.

[0024] Specifically, the elastic reset member 40 is connected to the vibration assembly 30, and the elastic reset member 40 can be connected to at least one of the components included in the vibration assembly 30, which is not limited in the embodiment of the present invention. In order to reduce the impact on the first magnet 31 and the second magnet 32, in one embodiment, the elastic reset member 40 connects the device housing 10 and the elastic base 33.

[0025] In the embodiment of the present invention, the elastic reset member 40 may be a spring, a rubber band, etc., and the embodiment of the present invention does not limit the specific type of the elastic reset member 40. The embodiment of the present invention also does not limit the number of the elastic reset members 40.

[0026] In one embodiment, there can be one elastic reset member 40. One elastic reset member 40 can have multiple setting positions, which is not limited in the embodiment of the present invention. In order to improve the balance of elastic reset, the elastic reset member 40 can be sleeved outside the first magnet 31, so that the periphery of the first magnet 31 can be subjected to the elastic force applied by the elastic reset member 40, thereby enabling the vibration assembly 30 to achieve reset in a relatively balanced manner.

[0027] In another embodiment, there may be a plurality of elastic reset members 40. The plurality of elastic reset members 40 may be distributed in a variety of ways, which are not limited in the embodiment of the present invention. In order to improve the balance of elastic reset, the plurality of elastic reset members 40 may be distributed around the first magnet 31. Furthermore, the plurality of elastic reset members 40 may be evenly distributed around the first magnet 31.

[0028] The embodiments listed above illustrate that the elastic reset member 40 can be distributed on the outside of the first magnet 31. In other embodiments, the elastic reset member 40 can also be distributed on the inside of the first magnet 31. As described above, the first magnet 31 is arranged around the second magnet 32. The outer edge of the second magnet 32 ​​is mainly used to form a magnetic gap 02 with the first magnet 31, and the part of the second magnet 32 ​​close to its center does not play a big role. Based on this, in other embodiments, the second magnet 32 ​​is provided with an avoidance hole 321, and the first end of the elastic reset member 40 can be connected to the device housing 10, and the second end of the elastic reset member 40 can extend into the avoidance hole 321 and be connected to the elastic base 33. This structure can dig out a part of the structure of the second magnet 32 ​​to provide space for the elastic reset member 40, which can make the structure of the sound-generating device 001 more compact. At the same time, the elastic reset member 40 is located in the space surrounded by the first magnet 31 and will not limit the size of the first magnet 31 on the outside of the first magnet 31, so as to reasonably increase the outer size of the first magnet 31 to strengthen the magnetism.

[0029] It should be noted that the first end of the elastic return member 40 and the second end of the elastic return member 40 are two opposite ends of the elastic return member 40 .

[0030] In the embodiment of the present invention, the device housing 10 is provided with a sound outlet hole 03, and the sound outlet hole 03 is connected to the front cavity 011. In the specific sound-generating process, the vibration component 30 pushes the air in the front cavity 011 to vibrate to generate sound, and then the sound is output from the sound outlet hole 03. The first magnet 31, the second magnet 32, the voice coil 20 and the elastic reset member 40 can be located in the front cavity 011, or in the rear cavity 012. In order to avoid interference with the sound generation of the front cavity 011 through the sound outlet hole 03, in one embodiment, in the embodiment of the present invention, the first magnet 31, the second magnet 32, the voice coil 20 and the elastic reset member 40 can be located in the rear cavity 012. The rear cavity 012 is a closed chamber, and this structure can also better protect the first magnet 31, the second magnet 32, the voice coil 20 and the elastic reset member 40.

[0031] In an embodiment of the present invention, the structure of the elastic base 33 can be various, and the elastic base 33 at least has elasticity, and can also provide an installation position for the first magnet 31 and the second magnet 32. The elastic base 33 can be designed as an elastic structure with good elasticity. Considering the installation stability of the first magnet 31 and the second magnet 32, in one embodiment, the elastic base 33 may include an elastic connector 331 and a rigid seat body 332. The elastic connector 331 has good elastic deformation ability, and the rigid seat body 332 has rigidity and is therefore not easy to deform. The elastic connector 331 is arranged around the rigid seat body 332, that is, the elastic connector 331 is an annular structure. The outer edge of the elastic connector 331 is connected to the inner wall of the device housing 10. The inner edge of the elastic connector 331 is connected to the edge of the rigid seat body 332. The first magnet 31 and the second magnet 32 ​​are arranged on the rigid seat body 332. In this structure, since the elastic connector 331 has good elastic deformation ability, it can ensure that the vibration component 30 reciprocates when subjected to force, and the rigid seat body 332 is not easy to deform, so that the problem of unstable connection between the first magnet 31 and the second magnet 32 ​​due to easy deformation is not easy to occur, so that the installation of the first magnet 31 and the second magnet 32 ​​is more stable. The rigid seat body 332 is not easy to deform, which is also conducive to more standardized vibration of the first magnet 31 and the second magnet 32 ​​installed thereon.

[0032] The elastic connector 331 can be made of an elastic material (such as a rubber material), or can be designed as an elastic structure, such as a bending structure. In one embodiment, the elastic connector 331 can be a folded ring that arches toward the front cavity 011 to form an annular protrusion. Of course, the embodiment of the present invention does not limit the specific material and specific structure of the elastic connector 331. The rigid seat body 332 can be made of a material with higher hardness, such as metal. The embodiment of the present invention does not limit the specific material and shape of the rigid seat body 332. In one embodiment, the rigid seat body 332 can be a rigid plate-like structural member. This structure is thinner, which is conducive to the rigid seat body 332 occupying a smaller space in the inner cavity 01.

[0033] In other embodiments of the present invention, the rigid seat body 332 can be a magnetic conductive component made of a magnetic conductive material, such as an iron component. The magnetic conductive component is conducive to guiding the magnetic field of the first magnet 31 and the second magnet 32, so that the magnetic fields of the first magnet 31 and the second magnet 32 ​​are more densely gathered in the magnetic gap 02, thereby better magnetically cooperating with the energized voice coil 20.

[0034] In a more specific embodiment, the elastic base 33 includes an elastic connector 331 and a rigid seat body 332, and the sound-generating device 001 includes an elastic reset member 40, and the end of the elastic reset member 40 may include a flange 41, and the flange 41 may be sandwiched between the inner edge of the elastic connector 331 and the edge of the rigid seat body 332. In this case, the inner edge of the elastic connector 331 may be fixedly connected to the flange 41, and the flange 41 is fixedly connected to the edge of the rigid seat body 332, and finally the elastic connector 331 is connected to the rigid seat body 332 through the flange 41. In this structure, the connection of the flange 41 is more stable, which is conducive to the elastic reset member 40 to better realize the reset of the vibration component 30.

[0035] In an embodiment of the present invention, the device housing 10 may include a top wall 11, a bottom wall 12, and a baffle 13. The baffle 13 connects the top wall 11 and the bottom wall 12, and the baffle 13, the top wall 11, and the bottom wall 12 enclose an inner cavity 01. The baffle 13 may be provided with a sound outlet hole 03, and the sound outlet hole 03 is connected to the front cavity 011. In other embodiments, the sound outlet hole 03 may also be provided on the top wall 11. The top wall 11, the bottom wall 12, and the baffle 13 may be connected by bonding, connecting parts, etc., and the top wall 11, the bottom wall 12, and the baffle 13 may also be an integrated structure, which is not limited by the embodiment of the present invention.

[0036] In the embodiment where the sound outlet hole 03 is provided in the enclosure 13, part of the edge of the elastic base 33 can overlap the edge of the sound outlet hole 03. This structure can better utilize the edge of the sound outlet hole 03 to support the elastic base 33, so that the heavier vibration component 30 can be better supported, which is beneficial to the stability of its connection and vibration.

[0037] Based on the sound-emitting device disclosed in the embodiment of the present invention, the embodiment of the present invention discloses an electronic device, which may include a device housing 002 and the sound-emitting device 001 described in the above embodiment, and the sound-emitting device 001 may be disposed inside the device housing 002. Specifically, the device housing 10 may be fixed in the inner cavity of the device housing 002, and the sound outlet hole 03 on the device housing 10 may cooperate with the corresponding hole on the device housing 002, thereby realizing the transmission of sound outside the electronic device.

[0038] The electronic device disclosed in the embodiments of the present application may be a smart phone, a tablet computer, an e-book reader, a wearable device (such as a smart watch), an electronic game console, VR (Virtual Reality) glasses, and the like. The embodiments of the present application do not limit the specific types of electronic devices.

[0039] The above embodiments of the present invention focus on the differences between the various embodiments. As long as the different features of the various embodiments are not contradictory, they can be combined to form more specific embodiments. Considering the simplicity of the text, they will not be repeated here.

[0040] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A sound-generating device, characterized in that: It comprises a device housing (10), and a voice coil (20) and a vibration component (30) arranged in an inner cavity (01) of the device housing (10); The vibration component (30) comprises a first magnet (31), a second magnet (32) and an elastic base (33), wherein the elastic base (33) separates the inner cavity (01) into a front cavity (011) and a rear cavity (012) that are isolated from each other; The first magnet (31) and the second magnet (32) are arranged on the elastic base (33); the first magnet (31) is arranged around the second magnet (32); a magnetic gap (02) is formed between the first magnet (31) and the second magnet (32); The first end of the voice coil (20) is connected to the device housing (10), and the second end of the voice coil (20) extends into the magnetic gap (02). The voice coil (20) is used to drive the vibration component (30) to vibrate through magnetic cooperation with the first magnet (31) and the second magnet (32) when power is supplied.

2. The sound generating device according to claim 1, characterized in that: The sound-generating device further comprises an elastic reset member (40), wherein the elastic reset member (40) connects the vibration component (30) and the device housing (10), and the elastic reset member (40) is used to drive the vibration component (30) to reset.

3. The sound-generating device according to claim 2, characterized in that: The elastic return member (40) is connected to the elastic base (33) and the device housing (10), wherein: There is one elastic return member (40), which is sleeved outside the first magnet (31); or there are multiple elastic return members (40), which are distributed around the first magnet (31).

4. The sound-generating device according to claim 2, characterized in that: The second magnet (32) is provided with an avoidance hole (321), the first end of the elastic reset member (40) is connected to the device housing (10), and the second end of the elastic reset member (40) extends into the avoidance hole (321) and is connected to the elastic base (33).

5. The sound generating device according to claim 2, characterized in that: The first magnet (31), the second magnet (32), the voice coil (20) and the elastic return member (40) are located in the rear cavity (012).

6. The sound generating device according to claim 1, characterized in that: The elastic base (33) comprises an elastic connecting member (331) and a rigid base body (332); the elastic connecting member (331) is arranged around the rigid base body (332); the outer edge of the elastic connecting member (331) is connected to the inner wall of the device housing (10); the inner edge of the elastic connecting member (331) is connected to the edge of the rigid base body (332); and the first magnet (31) and the second magnet (32) are arranged on the rigid base body (332).

7. The sound generating device according to claim 6, characterized in that: The rigid seat body (332) is a rigid plate-shaped structural member, and / or the elastic connecting member (331) is a folded ring that arches toward the front cavity (011) to form an annular protrusion.

8. The sound generating device according to claim 6, characterized in that: The rigid seat body (332) is a magnetic conductive component made of magnetic conductive material.

9. The sound generating device according to claim 1, characterized in that: The device shell (10) comprises a top wall (11), a bottom wall (12) and a surround (13); the surround (13) connects the top wall (11) and the bottom wall (12); the surround (13), the top wall (11) and the bottom wall (12) enclose the inner cavity (01); the surround (13) is provided with a sound outlet hole (03); the sound outlet hole (03) is connected to the front cavity (011); and a portion of the edge of the elastic base (33) overlaps the edge of the sound outlet hole (03).

10. An electronic device, characterized in that: It comprises a device housing (002) and a sound-generating device (001) according to any one of claims 1 to 9, wherein the sound-generating device (001) is arranged in the device housing (002).

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