A vibration device and an electronic product

Abstract

The present invention discloses a vibration device and an electronic product. The vibration device includes a housing having a cavity. The vibration device further includes an oscillator assembly, a stator assembly, and an elastic element. The oscillator assembly is disposed in the cavity and includes a permanent magnet. The stator assembly is disposed in the cavity and includes a coil assembly. The oscillator assembly is suspended in the cavity through the elastic element. The coil assembly includes at least one coil and at least one annular frame. The annular frame is sleeved outside the coil. The permanent magnet and the coil generate reciprocating vibration of the oscillator assembly through electromagnetic action. The material of the annular frame is a conductive and non-magnetic material, and the annular frame is configured to impede the vibration of the oscillator assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic products, and particularly to a vibration device and an electronic product. Background Art

[0002] A vibration device usually realizes regular reciprocating vibration through a vibration component. Its vibration experience is not only reflected in the natural frequency and the magnitude of vibration acceleration, but also in its response speed (i.e., the time for the vibration frequency of the product to rise and fall), and the performance parameter of the response speed of the vibration device is affected by the damping of the designed product. For example, due to the inherent simple harmonic vibration characteristics of a linear vibration motor, its own internal damping is insufficient to meet the requirements of the takeoff and landing time. Therefore, an external damping is required to make the start and stop times shorter, so that the displacement of its vibration can be controlled to reach a stable state and the reliability is higher.

[0003] The damping of existing vibration devices is generally foam, silica gel, magnetic fluid, etc. Such damping has defects such as non-linearity, poor controllability of damping magnitude, easy fatigue and breakage, poor durability, large damping noise, and great assembly difficulty. For example, magnetic fluid has poor stability in an environment with alternating high and low temperatures, and the foam holes of silica gel or foam are prone to irreversible deformation in a high-temperature environment. Therefore, the damping of existing vibration devices is greatly affected by the assembly accuracy of the product, the product performance consistency is relatively poor, and the damping characteristic stability is poor in an environment with alternating high and low temperatures, thus easily leading to a reduction in the reliability of the product.

[0004] In view of this, a new technical solution is needed to solve the above technical problems. Summary of the Invention

[0005] An object of the present invention is to provide a new technical solution for a vibration device and an electronic product.

[0006] According to a first aspect of the present invention, there is provided a vibration device, comprising:

[0007] A housing having a cavity;

[0008] An oscillator assembly disposed in the cavity, the oscillator assembly including a permanent magnet;

[0009] A stator assembly disposed in the cavity, the stator assembly including a coil assembly;

[0010] An elastic element, the oscillator assembly being suspended in the cavity through the elastic element;

[0011] The coil assembly includes at least one coil and at least one annular frame. The annular frame is sleeved outside the coil. The permanent magnet and the coil act electromagnetically to cause the oscillator assembly to vibrate reciprocally. The annular frame is made of a conductive and non-magnetic material and is configured to impede the vibration of the oscillator assembly.

[0012] Optionally, a through hole is provided in the middle of the coil. The coil assembly further includes a core body, which is embedded in the through hole of the coil. The core body is made of a conductive and non-magnetic material and is configured to impede the vibration of the oscillator assembly.

[0013] Optionally, the conductive and non-magnetic material includes one of copper, aluminum, and nickel-chromium alloy.

[0014] Optionally, the oscillator assembly further includes a counterweight, which is connected to the permanent magnet.

[0015] Optionally, a receiving cavity is provided on the counterweight, and the permanent magnet is disposed in the receiving cavity.

[0016] Optionally, two elastic elements are provided, and the two elastic elements are respectively located on both sides of the counterweight along the vibration direction of the oscillator assembly.

[0017] Optionally, the elastic element is a V-shaped elastic sheet.

[0018] Optionally, the vibration device further includes a magnetic conductive plate, which is connected to the permanent magnet.

[0019] Optionally, the vibration device further includes an FPC, which is connected to the coil assembly.

[0020] According to another aspect of the present invention, an electronic product is provided, which includes the vibration device as described above.

[0021] In the vibration device provided by the embodiment of the present invention, since an annular frame made of a conductive and non-magnetic material is sleeved outside the coil, and the annular frame and the coil are fixed as a part of the stator assembly and thus move in the opposite direction relative to the oscillator assembly. Therefore, the annular frame can generate a motional electromotive force in the moving magnetic field, thereby generating an induced current. The induced current can act on the oscillator assembly in a reactive manner, thereby generating a damping effect on the oscillator assembly, so that the start-up braking time of the vibration device is short and the noise of the vibration device is reduced. And compared with traditional damping members such as foam, silica gel, and magnetic fluid, the annular frame made of a conductive and non-magnetic material adopted in the embodiment of the present invention has the advantage of strong performance stability in an environment with alternating high and low temperatures, greatly improving the performance consistency of the product.

[0022] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0024] Figure 1 Schematic exploded view of a vibration device provided by the present invention;

[0025] Figure 2 Schematic cross-sectional view of a vibration device provided by the present invention;

[0026] Figure 3 Schematic partial view of a vibration device provided by the present invention;

[0027] Figure 4 Schematic partial view of the vibration device corresponding to the setting of two coils Figure 1 ;

[0028] Figure 5 Schematic partial view of the vibration device corresponding to the setting of two coils Figure 2 ;

[0029] Figure 6 Schematic diagram of the permanent magnet and coils corresponding to the setting of two coils. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present invention.

[0031] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or its use.

[0032] Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered as part of the specification.

[0033] In all examples shown and discussed herein, any specific values should be construed as merely exemplary and not as a limitation. Thus, other examples of exemplary embodiments may have different values.

[0034] It should be noted that: Like reference numerals and letters denote like items in the following drawings; thus, once an item is defined in one drawing, further discussion thereof is not required in subsequent drawings.

[0035] An embodiment of the present invention provides a vibration device. Refer to Figure 1 , Figure 2 As shown, the vibration device includes a housing having a cavity; the vibration device further includes an oscillator assembly, a stator assembly, and an elastic element. The oscillator assembly is disposed in the cavity and includes a permanent magnet 1; the stator assembly is disposed in the cavity and includes a coil 2 assembly; the oscillator assembly is suspended in the cavity through the elastic element; the coil 2 assembly includes at least one coil 2 and at least one annular frame 3, the annular frame 3 is sleeved outside the coil 2, and the permanent magnet 1 and the coil 2 generate reciprocating vibration of the oscillator assembly through electromagnetic interaction; the material of the annular frame 3 is a conductive and non-magnetic material, and the annular frame 3 is configured to impede the vibration of the oscillator assembly.

[0036] In the vibration device provided by the embodiment of the present invention, an annular frame 3 made of a conductive and non-magnetic material is sleeved outside the coil 2. The coil 2 is located in the magnetic field generated by the permanent magnet 1 and cuts the magnetic induction line. When an alternating current signal is applied to the coil 2, an interaction can occur between the coil 2 and the permanent magnet 1 to generate a Lorentz force. Among them, the permanent magnet 1 is used to form a magnetic field. The permanent magnet 1 can be a ferrite magnet or a neodymium iron boron magnet. The shape of the permanent magnet 1 can be designed according to actual needs as long as it is convenient for processing. For example, a cuboid, a cylinder, a prism, etc. The oscillator assembly generates reciprocating motion under the action of the Lorentz force and the restoring force of the elastic element. The annular frame 3 and the coil 2 are fixed as a part of the stator assembly and are equivalent to moving in the opposite direction relative to the oscillator assembly. Therefore, the annular frame 3 can generate a motional electromotive force in the moving magnetic field, thereby generating an induced current. The induced current can act on the oscillator assembly in the opposite direction, thereby generating a damping effect on the oscillator assembly, so that the start-up braking time of the vibration device is short and the noise of the vibration device is reduced. And compared with traditional damping members such as foam, silica gel, and magnetic fluid, the annular frame 3 made of a conductive and non-magnetic material adopted in the embodiment of the present invention has the advantage of strong performance stability in an environment with alternating high and low temperatures, greatly improving the performance consistency of the product. In addition, the coil 2 bracket can also play a role in limiting and protecting the coil 2.

[0037] Refer to Figure 1 , Figure 3As shown, in one embodiment, the middle part of the coil 2 has a through hole. The coil 2 is wound by a wire in one direction to form a closed annular structure. The area around the through hole in the middle is the wiring area of the coil 2. The wiring area refers to the area where the leads in the coil 2 actually pass through, and the entire wiring area is annular. The coil 2 assembly further includes a core body 4, and the core body 4 is embedded in the through hole of the coil 2. The material of the core body 4 is a conductive and non-magnetic material, and the core body 4 is configured to impede the vibration of the oscillator assembly.

[0038] The core body 4 made of a conductive and non-magnetic material can play the same role as the annular frame 3. The core body 4 can strengthen the induction effect of motional electromotive force, thereby increasing the reaction force on the permanent magnet 1, and thus enhancing the damping effect on the oscillator assembly.

[0039] In addition, the annular frame 3 and the core body 4 in the embodiments of the present invention are also applicable to the multi-drive coil solution. Refer to Figure 4 As shown, for example, in a vibration device provided with the coil 2 and the coil 2', an annular frame 3 can be sleeved outside the coil 2 and the coil 2' respectively, and a core body 4 can be embedded in each of the through holes of the coil 2 and the coil 2'; Refer to Figure 5 As shown, it can also be to provide an annular frame 3, and the annular frame 3 has two annular through holes respectively matching the coil 2 and the coil 2'. The coil 2 and the coil 2' are respectively arranged in the two annular through holes, and a core body 4 is embedded in each of the through holes of the coil 2 and the coil 2'. Refer to Figure 6 As shown, in a vibration device provided with two coils (coil 2 and coil 2'), three groups of permanent magnets are provided corresponding to the two coils, which are respectively Figure 6 the permanent magnet 1-1, the permanent magnet 1-2 and the permanent magnet 1-3 shown in Figure 6 The arrow directions in represent the magnetization directions of the respective permanent magnets. The current directions of the coil 2 and the coil 2' are opposite. Therefore, as Figure 4 shown, the current directions of the two annular frames 3 are also opposite; as Figure 5 shown, the current directions around the two annular through holes of the annular frame 3 are also opposite.

[0040] In one embodiment, the conductive and non-magnetic material includes one of copper, aluminum, and nickel-chromium alloy. These conductive and non-magnetic materials such as copper, aluminum, and nickel-chromium alloy are low in cost, which is beneficial to cost control during mass production. Of course, in the vibration device provided in the embodiments of the present invention, the materials of the annular frame 3 and the core body 4 are not limited to copper, aluminum, and nickel-chromium alloy, as long as they meet the performance of being conductive and non-magnetic.

[0041] Refer to Figure 1 、 Figure 2As shown, in one embodiment, the oscillator assembly further includes a counterweight 5, and the counterweight 5 is connected to the permanent magnet 1. The counterweight 5 is used to increase the inertia of the oscillator assembly to enhance the vibration feeling, and the counterweight 5 is made of a magnetic conductive material.

[0042] In one embodiment, a receiving cavity 51 is provided on the counterweight 5, and the permanent magnet 1 is disposed in the receiving cavity 51. The provision of the receiving cavity 51 is conducive to the miniaturization and thinning design of the vibration device.

[0043] In one embodiment, two elastic elements are provided, and the two elastic elements are respectively located on both sides of the counterweight 5 along the vibration direction of the oscillator assembly. The elastic elements can generate damping and buffering effects, and provide a restoring force and a buffering effect for the vibration of the oscillator assembly.

[0044] In one embodiment, the elastic element is a V-shaped elastic sheet 6. One side of the V-shaped elastic sheet 6 is connected to the counterweight 5, and the other side is connected to the inner side wall of the housing. Optionally, both sides of the counterweight 5 along the vibration direction of the oscillator assembly can be designed as a wedge shape adapted to the shape of the V-shaped elastic sheet 6. That is, the part of the side of the counterweight 5 connected to the opening of the V-shaped elastic sheet 6 has a larger thickness, while the part of the side of the counterweight 5 connected to the connecting part of the V-shaped elastic sheet 6 has a smaller thickness. Such a design can form an avoidance for the V-shaped elastic sheet 6, which enables a larger expansion and contraction range of the V-shaped elastic sheet 6. And it saves the space of the inner cavity of the housing, which is conducive to the miniaturization and thinning design of the vibration device. It can be understood that the elastic element is not limited to the V-shaped elastic sheet 6, and can also be other shaped and structured elastic sheets, and can also be an elastic rubber part, a spring, etc.

[0045] Reference Figure 1 、 Figure 2 As shown, in one embodiment, the vibration device further includes a magnetic conductive plate 7, and the magnetic conductive plate 7 is connected to the permanent magnet 1. The magnetic conductive plate 7 is made of a magnetic conductive material, such as SUS-430. The magnetic conductive plate 7 has a function of converging and concentrating the magnetic field generated by the permanent magnet 1, correcting and gathering the magnetic induction lines emitted by the permanent magnet 1, thereby increasing the magnetic field strength and reducing magnetic leakage.

[0046] Reference Figure 1 、 Figure 2 As shown, in one embodiment, the vibration device further includes an FPC 8, and the FPC 8 is connected to the coil 2 assembly. Specifically, the FPC 8 is used to conduct the coil 2 with an external circuit to transmit an electrical signal. For example, the lead of the coil 2 is connected to the FPC 8, and the FPC 8 is connected to the main control chip. The provision of the FPC 8 can make the signal transmission effect of the vibration device better and have a long service life.

[0047] Reference Figure 1As shown, in one embodiment, the housing includes an upper housing 9 and a lower housing 10. Optionally, the upper housing 9 is a cylindrical structure with an open end, and the lower housing 10 is a plate-like structure covering the open end of the upper housing 9. The FPC 8 is disposed on the inner surface of the lower housing 10. The housing of this structure is convenient for processing and facilitates the installation of the stator assembly and the oscillator assembly. The overall shape of the housing is rectangular parallelepiped. Of course, in other embodiments, the shape of the housing can also be a shape similar to a rectangular parallelepiped, such as oval, racetrack shape, etc. The material of the housing can be but is not limited to metal, plastic, ceramic, etc. In an alternative embodiment, the upper housing 9 is made of a magnetic conductive material, and selecting the upper housing 9 made of a magnetic conductive material can reduce magnetic leakage.

[0048] An embodiment of the present invention further provides an electronic product, which includes the vibration device as described above. The electronic product can be, for example, an electronic device such as a mobile phone, a game console, a laptop computer, a wearable device, a walkie-talkie, etc. The vibration device can be, for example, a linear vibration motor, or can also be an exciter for driving the screen of the mobile phone to vibrate and generate sound.

[0049] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A vibration device, characterized in that, Comprising: A housing, the housing includes an upper shell and a lower shell, and the housing has a cavity; An oscillator assembly, the oscillator assembly is disposed in the cavity, and the oscillator assembly includes a permanent magnet; A stator assembly, the stator assembly is disposed in the cavity, and the stator assembly includes a coil assembly; An elastic element, the oscillator assembly is suspended in the cavity through the elastic element; The coil assembly includes at least one coil and at least one annular frame, the annular frame is sleeved outside the coil, and the permanent magnet and the coil generate reciprocating vibration of the oscillator assembly through electromagnetic action; the material of the annular frame is a conductive and non-magnetic material, and the annular frame is configured to impede the vibration of the oscillator assembly; a through hole is provided in the middle of the coil, and the coil assembly further includes a core body, the core body is embedded in the through hole of the coil, and the material of the core body is a conductive and non-magnetic material, and the core body is configured to impede the vibration of the oscillator assembly.

2. The vibration device according to claim 1, wherein The conductive and non-magnetic material includes one of copper, aluminum, and nickel-chromium alloy.

3. The vibration device according to claim 1, characterized in that, The oscillator assembly further includes a counterweight, and the counterweight is connected to the permanent magnet.

4. The vibration device according to claim 3, characterized in that, A receiving cavity is provided on the counterweight, and the permanent magnet is disposed in the receiving cavity.

5. The vibration device according to claim 3, wherein Two elastic elements are provided, and the two elastic elements are respectively located on both sides of the counterweight along the vibration direction of the oscillator assembly.

6. The vibration device according to claim 5, characterized in that, The elastic element is a V-shaped elastic sheet.

7. The vibration device according to claim 1, characterized in that, The vibration device further includes a magnetic conductive plate, and the magnetic conductive plate is connected to the permanent magnet.

8. The vibration device according to claim 1, characterized in that, The vibration device further includes an FPC, and the FPC is connected to the coil assembly.

9. An electronic product, characterized in that, It includes the vibration device according to any one of claims 1-8.

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