Vibration exciter

Abstract

The utility model relates to a vibration exciter, which comprises a suspension support, a diaphragm assembly, a voice coil and a magnetic circuit assembly, an installation space is defined by the suspension support, and the diaphragm assembly, the voice coil and the magnetic circuit assembly are all arranged in the installation space; the magnetic circuit assembly forms an annular gap communicated with the installation space. The voice coil and the annular gap are coaxially arranged and at least part of the voice coil is arranged in the annular gap. The vibrating diaphragm assembly comprises two dampers which are arranged at intervals in the axial direction of the annular gap, the inner rings of the two dampers are connected to the magnetic circuit assembly, and the outer rings of the two dampers are connected to the suspension support so that the magnetic circuit assembly can be suspended in the installation space. According to the vibration exciter designed by the utility model, a double-damper structure is adopted, so that the size is smaller, higher vibration acceleration and stronger mechanical stability are brought, foreign matter interference possibly existing in an assembly environment can be effectively avoided, noise cannot be generated in a vibration process, and the vibration exciter is more compact in structure. And purer and better auditory experience is brought to the user.

Description

Technical Field

[0001] The utility model relates to the technical field of exciters, in particular to a vibration exciter. Background Art

[0002] In the existing technology, as people's requirements for in-car entertainment experience continue to increase, the performance of in-car audio systems has become increasingly important. Although traditional speaker systems can meet basic auditory needs, they have limitations in low-frequency performance, sound field creation, personalized sound effects, etc.

[0003] To make up for these shortcomings, vibration exciters are gradually being used in car audio systems. A vibration exciter (also called a tactile sensor or vibration motor) is a device that can convert audio signals into mechanical vibrations. That is, by installing vibration exciters on seats, doors, ceilings and other parts, passengers can feel the rhythm and intensity of the music, bringing a more immersive and shocking auditory experience. In addition, vibration exciters can also be used to simulate special sound effects such as road bumps and engine roars to enhance driving pleasure.

[0004] Although the existing vehicle-mounted vibration exciters have improved the sound effects to a certain extent, there are still some problems in practical applications:

[0005] (1) Too large volume: In order to achieve a stronger vibration effect, many existing vibration exciters often adopt a larger volume and weight, which makes it difficult to install them when the space in the car is limited, especially in a small space such as a seat, where installation is more difficult, limiting its scope of application.

[0006] (ii) Inconvenient installation: The internal structure of the vehicle is complex and the space is limited, while the existing vibration exciters usually lack flexible installation methods and are difficult to adapt to the installation requirements of different models and different parts.

[0007] (III) It is difficult to balance vibration and size: In order to reduce the volume, some vibration actuators adopt a reduced size design, but this results in a weakened vibration, making it difficult to provide an ideal tactile and auditory experience.

[0008] Due to the existence of the above problems, existing vibration exciters are often only suitable for specific types of vehicles or seats, and it is difficult to meet the market demand for diversified and personalized products. In addition, how to achieve lightweight and miniaturization of products while ensuring sufficient vibration is a technical problem that needs to be solved urgently. Summary of the invention

[0009] In order to solve the above problems, the utility model provides a vibration exciter that brings higher vibration acceleration and stronger mechanical stability, thus creating a stronger and better quality vibration sensation.

[0010] To achieve the above object, the vibration exciter designed by the utility model includes a suspension bracket, a diaphragm assembly, a voice coil, and a magnetic circuit assembly. The suspension bracket defines an installation space, and the diaphragm assembly, the voice coil, and the magnetic circuit assembly are all arranged in the installation space. The magnetic circuit assembly forms an annular gap communicating with the installation space. The voice coil is coaxially arranged with the annular gap and at least partially placed in the annular gap. The diaphragm assembly includes two flexure plates axially spaced along the annular gap. The inner circles of the two flexure plates are connected to the magnetic circuit assembly, and the outer circles of the two flexure plates are connected to the suspension bracket, so that the magnetic circuit assembly is suspended in the installation space.

[0011] To obtain a larger vibration amplitude and a stronger vibration feeling, and at the same time improve the low-frequency response, the flexure plate has continuous corrugated portions, and the corrugated portions protrude upward or downward relative to the planes where the inner and outer edges of the flexure plate are located.

[0012] To improve the vibration efficiency and stability, the two flexure plates are arranged in opposite directions.

[0013] To improve the performance and service life of the diaphragm, the flexure plate is made of CONEX material or NOMEX material.

[0014] For convenient installation, the suspension bracket includes a positioning ring, a bottom cover, and a top cover. The top cover and the bottom cover are respectively fixed to the upper and lower sides of the positioning ring through a snap structure to define the installation space. A plurality of ventilation holes are evenly spaced on the circumferential surface of the positioning ring, and the ventilation holes communicate with the gap formed between the two flexure plates.

[0015] To increase the magnetic field strength and uniformity, the magnetic circuit assembly includes a magnetic conductive bowl, a magnet, and a magnetic conductive plate. The magnetic conductive plate is bonded to the inside of the magnetic conductive bowl through the magnet to form a magnetic circuit. The circumferential surfaces of the magnetic conductive plate and the magnet are spaced from the inner wall of the magnetic conductive bowl to form the annular gap.

[0016] To provide a more stable connection structure, the inner and outer edges of the flexure plate extend in opposite directions to form support portions, and the suspension bracket and the magnetic circuit assembly are connected to the flexure plate through the corresponding support portions.

[0017] A further solution is that the outer circumferential surface of the magnetic circuit assembly is provided with a first annular flange, and the inner circumferential surface of the suspension bracket is provided with a second annular flange. The first annular flange and the second annular flange are respectively adhesively fixed to the corresponding support portions.

[0018] To provide shock absorption and buffering and reduce vibration noise, a first buffer layer is provided on one side of the top cover facing away from the bottom cover; an installation base is provided on one side of the bottom cover facing away from the top cover; the installation base is fixed to the positioning ring through a snap structure; and a plurality of claws are provided on the periphery of the installation base.

[0019] In a further solution, a second buffer layer is provided on the surface of the claw hook of the claw.

[0020] The vibration exciter designed by the present utility model, by adopting a double diaphragm structure, not only realizes a smaller volume, but also brings higher vibration acceleration and stronger mechanical stability, creating a stronger and better vibration body feeling. In addition, this structure can effectively avoid foreign object interference that may exist in the assembly environment, ensure that there is no noise during vibration, and bring a purer and better auditory experience to users. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the vibration exciter provided by an embodiment of the present application.

[0022] Figure 2 is Figure 1 exploded perspective view.

[0023] Figure 3 is a top view of the vibration exciter provided by an embodiment of the present application.

[0024] Figure 4 is Figure 3 a cross-sectional view taken along line A-A in

[0025] Figure 5 is Figure 4 an enlarged schematic view at B in

[0026] Figure 6 is an installation schematic diagram of the vibration exciter provided by an embodiment of the present application.

[0027] Wherein: suspension bracket 10, positioning ring 11, ventilation hole 111, bottom cover 12, top cover 13, second annular flange 14, diaphragm assembly 20, diaphragm 20a, corrugated portion 21, support portion 22, voice coil 30, magnetic circuit assembly 40, magnetic bowl 41, magnet 42, magnetic conductive plate 43, first annular flange 44, installation space 50, annular gap 60, first buffer layer 70, installation base 80, claw 81, second buffer layer 82, adhesive layer 90, steel mesh 100. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following is a description of the preferred embodiments of the present utility model with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present utility model, and are not intended to limit the present utility model.

[0029] Embodiment 1

[0030] The vibration exciter provided in this embodiment can be used as a component of a vehicle audio system, cooperate with other speakers, and be installed at positions such as seats, doors, and ceilings to create a sound field with a specific effect.

[0031] Refer to Figures 1-6 As shown, the vibration exciter described in this embodiment specifically includes a suspension bracket 10, a diaphragm assembly 20, a voice coil 30, and a magnetic circuit assembly 40. The suspension bracket 10 defines an installation space 50, and the diaphragm assembly 20, the voice coil 30, and the magnetic circuit assembly 40 are all arranged in the installation space 50; the magnetic circuit assembly 40 forms an annular gap 60 communicating with the installation space 50, the voice coil 30 is coaxially arranged with the annular gap 60 and at least partially placed in the annular gap 60; the diaphragm assembly 20 includes two spider webs 20a axially spaced along the annular gap 60, the inner circles of the two spider webs 20a are connected to the magnetic circuit assembly 40, and the outer circles of the two spider webs 20a are connected to the suspension bracket 10, so that the magnetic circuit assembly 40 is suspended in the installation space 50.

[0032] Among them, refer to Figure 2 and Figure 3 As shown, the suspension bracket 10 constitutes the outer frame of the vibration exciter, defines an installation space 50. The installation space 50 not only accommodates other components, but also forms a physical barrier, effectively avoiding interference from foreign objects that may exist in the assembly environment. The diaphragm assembly 20 is the core component of the vibration exciter, including two spider webs 20a, which are responsible for converting electrical signals into mechanical vibrations. The voice coil 30 is arranged in the annular gap 60 and cooperates with the magnetic circuit assembly 40 to generate a driving force to drive the diaphragm assembly 20 to vibrate.

[0033] Particularly, the magnetic circuit assembly 40 is suspended in the installation space 50 through two spider webs 20a. When an axial force is applied, the magnetic circuit assembly 40 pushes the two spider webs 20a, causing them to deform and squeeze towards the center of the annular gap 60, thereby driving the entire magnetic circuit assembly 40 to vibrate up and down. Compared with other exciters of the same volume, this structure realizes a larger magnetic circuit system, thereby obtaining a stronger driving force.

[0034] In addition, compared with the traditional single flexure structure, the double flexure 20a structure can achieve a higher vibration acceleration under the same driving force, bringing a stronger vibration feeling. This is because the double flexure structure effectively reduces the resonance frequency (F0) of the diaphragm assembly 20: The resonance frequency (F0) refers to the frequency at which the system is most easily excited to produce resonance. For a vibration exciter, the lower the F0, the better its low-frequency response, and the more it can show a thick and strong bass effect. For the traditional single flexure structure, its F0 is usually between 80 - 100 Hz, which is difficult to meet the performance requirements of the low-frequency part of music (usually between 50 - 70 Hz). However, the double flexure structure adopted in this embodiment effectively reduces F0 to 50 - 70 Hz by increasing the vibration mass and reducing the equivalent elastic coefficient.

[0035] According to the formula F0 = 1 / 2π * (1 / (MMS * CMS))^0.5) (CMS is the compliance of the support force of the flexure 20a, and MMS is the mass of the entire vibration system (i.e., two flexures 20a plus the magnetic circuit assembly 40)), the increase in mass will cause F0 to decrease. Therefore, when the audio signal frequency approaches the resonance frequency (50 - 70 Hz) of the diaphragm assembly 20, it is easier to drive it to produce a larger vibration amplitude, and finally obtain a larger vibration acceleration. That is, compared with vibration exciters of the same specification, it can reduce the volume and enhance the vibration feeling. In this embodiment, the flexure 20a is made of CONEX material or NOMEX material. CONEX and NOMEX materials have excellent heat resistance and can withstand a high working temperature without performance degradation or aging, ensuring the stable operation of the vibration exciter in a high-temperature environment (such as inside a car in summer).

[0036] In some embodiments, referring to Figure 3 and Figure 4 As shown, to improve the low-frequency response at the same time, the flexure 20a has a continuous corrugated portion 21, and the corrugated portion 21 protrudes upward or downward relative to the planes of the inner and outer edges of the flexure 20a. In this way, compared with the planar diaphragm, the actual vibration area of the corrugated portion 21 is larger under the same diameter, which can push more air, thereby generating a larger amplitude and a stronger vibration feeling, which is beneficial to reducing the overall volume of the vibration exciter.

[0037] Specifically, the two flexures 20a are arranged in opposite directions. Using this structural design, when the voice coil 30 drives the diaphragm assembly 20 to vibrate, the two flexures 20a in opposite directions will generate transverse forces that cancel each other out, that is, it can ensure that the diaphragm assembly 20 does not shift from the magnetic circuit assembly 40 during the vibration process, position the diaphragm assembly 20 to keep it moving along the axis of the annular gap 60, and ensure the stability and consistency of the vibration output.

[0038] In some embodiments, referring to Figure 1 andFigure 2 As shown, the suspension bracket 10 includes a positioning ring 11, a bottom cover 12 and a top cover 13. The top cover 13 and the bottom cover 12 are respectively fixed to the upper side and the lower side of the positioning ring 11 through a snap structure to define the installation space 50. A plurality of ventilation holes 111 are evenly distributed at intervals on the circumferential surface of the positioning ring 11, and the ventilation holes 111 communicate with the gap formed between the two voice coils 20a.

[0039] In this way, the application of the snap structure makes the installation and disassembly of the suspension bracket 10 very simple. There is no need to use complex tools such as screws. Just align the top cover 13 and the bottom cover 12 with the positioning ring 11 and press gently to complete the installation. The evenly distributed ventilation holes 11 on the positioning ring 11 communicate with the gap between the voice coils 20a to form air circulation, dissipating heat in time and avoiding heat accumulation from affecting the performance and lifespan of the vibration exciter.

[0040] In some embodiments, referring to Figure 2 and Figure 4 As shown, in order to improve the magnetic field strength and uniformity, the magnetic circuit assembly 40 includes a magnetic conductive bowl 41, a magnet 42 and a magnetic conductive plate 43. The magnetic conductive plate 43 is bonded to the inside of the magnetic conductive bowl 41 through the magnet 42 to form a magnetic circuit. An annular gap 60 is formed between the circumferential surfaces of the magnetic conductive plate 43 and the magnet 42 and the inner wall of the magnetic conductive bowl 41. Specifically, during implementation, the magnetic conductive bowl 41, the magnet 42 and the magnetic conductive plate 43 are bonded and fixed through glue, which is easy to process and assemble without additional fixing structures, facilitating the miniaturized design of the vibration exciter.

[0041] In some embodiments, referring to Figure 5 As shown, the inner and outer ring edges of the voice coil 20a respectively extend in opposite directions to form support portions 22. The suspension bracket 10 and the magnetic circuit assembly 40 are connected to the voice coil 20a through the corresponding support portions 22.

[0042] Specifically, a first annular flange 44 is provided on the outer circumferential surface of the magnetic circuit assembly 40, and a second annular flange 14 is provided on the inner circumferential surface of the suspension bracket 10. The first annular flange 44 and the second annular flange 14 are respectively bonded and fixed to the corresponding support portions 22.

[0043] Specifically, by extending the support portions 22 on the voice coil 20a and bonding and fixing them to the annular flanges (14, 44) on the suspension bracket 10 and the magnetic circuit assembly 40 respectively, this bonding method increases the bonding area, improves the connection strength, can withstand greater tensile and shear forces, and effectively avoids the loosening or detachment of the connection during vibration.

[0044] In some embodiments, referring toFigure 1 and Figure 2 As shown in Figure 2 , to reduce vibration noise, a first buffer layer 70 is provided on the side of the top cover 13 facing away from the bottom cover 12; an installation base 80 is provided on the side of the bottom cover 12 facing away from the top cover 13; the installation base 80 is fixed to the positioning ring 11 through a snap structure; and a plurality of claws 81 are provided on the periphery of the installation base 80.

[0045] In specific implementation, taking the seat installation scenario as an example for illustration, the multiple claws 81 on the installation base 80 can firmly grasp the steel mesh inside the seat. Even on bumpy road conditions, the vibration exciter can be kept stable, avoiding loosening or falling off. And the first buffer layer 70 can effectively reduce the degree of vibration transmitted to the surface of the vibration exciter, thereby reducing the possibility of generating noise during vibration and enhancing the user's comfort experience. The first buffer layer 70 is preferably made of sponge.

[0046] In this embodiment, referring to Figure 6 As shown in Figure 6 , a second buffer layer 82 is provided on the surface of the claw hook of the claw 81. The second buffer layer 82 is made of pure nylon material. When the installation base 80 is assembled in place, the multiple claws 81 are all in contact with the steel wire 100 through the second buffer layer 82, avoiding the noise problem that may be caused by direct rigid contact.

[0047] The vibration exciter provided in this embodiment, by adopting a double diaphragm structure, not only achieves a smaller volume, but also brings higher vibration acceleration and stronger mechanical stability, creating a stronger and better vibration physical sensation. In addition, this structure can effectively avoid the interference of foreign objects that may exist in the assembly environment, ensuring that no noise will occur during vibration and bringing a purer and better auditory experience to the user.

[0048] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0049] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "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, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0050] Finally, it should be noted that the above are only preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements on some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A vibration exciter, comprising a suspension bracket, a diaphragm assembly, a voice coil and a magnetic circuit assembly, characterized in that: The suspension bracket defines an installation space, and the diaphragm assembly, voice coil and magnetic circuit assembly are all arranged in the installation space; the magnetic circuit assembly is formed with an annular gap connected to the installation space, and the voice coil is coaxially arranged with the annular gap and at least partially placed in the annular gap; the diaphragm assembly includes two elastic waves axially spaced apart along the annular gap, the inner circles of the two elastic waves are connected to the magnetic circuit assembly, and the outer circles of the two elastic waves are connected to the suspension bracket, so that the magnetic circuit assembly is suspended in the installation space.

2. The vibration exciter according to claim 1, characterized in that: The wave spring has a continuous corrugated portion, and the corrugated portion protrudes upward or downward relative to the plane where the inner circle edge and the outer circle edge of the wave spring are located.

3. The vibration exciter according to claim 1 or 2, characterized in that: The two spring waves are arranged in opposite directions.

4. The vibration exciter according to claim 3, characterized in that: The elastic wave is made of CONEX material or NOMEX material.

5. The vibration exciter according to claim 1, characterized in that: The suspension bracket includes a positioning ring, a bottom cover and a top cover, and the top cover and the bottom cover are respectively fixed to the upper side and the lower side of the positioning ring through a snap-on structure to define the installation space; a plurality of air holes are evenly spaced on the circumferential surface of the positioning ring, and the air holes are connected to the gap formed between the two elastic waves.

6. The vibration exciter according to claim 1, characterized in that: The magnetic circuit assembly includes a magnetic bowl, a magnet and a magnetic plate. The magnetic plate is bonded to the magnetic bowl through the magnet to form a magnetic circuit. The circumferential surfaces of the magnetic plate and the magnet are spaced from the inner wall of the magnetic bowl to form the annular gap.

7. The vibration exciter according to claim 1 or 2 or 5 or 6, characterized in that: The inner circle edge and the outer circle edge of the elastic wave extend in opposite directions to form support parts, and the suspension bracket and the magnetic circuit component are connected to the elastic wave through the corresponding support parts.

8. The vibration exciter according to claim 7, characterized in that: A first annular flange is provided on the circumferential outer surface of the magnetic circuit component, and a second annular flange is provided on the circumferential inner surface of the suspension bracket; the first annular flange and the second annular flange are respectively bonded and fixed to the corresponding support parts.

9. The vibration exciter according to claim 5, characterized in that: A first buffer layer is provided on the side of the top cover away from the bottom cover; a mounting base is provided on the side of the bottom cover away from the top cover; the mounting base is fixed to the positioning ring via a buckle structure; and a plurality of claws are provided on the circumference of the mounting base.

10. The vibration exciter according to claim 9, characterized in that: A second buffer layer is provided on the claw hook surface of the clamping claw.

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