CN111049349A

CN111049349A - Vibrating device and electronic product

Info

Publication number: CN111049349A
Application number: CN201911357352.1A
Authority: CN
Inventors: 史德璋; 毛东升
Original assignee: Goertek Techology Co Ltd
Current assignee: Goertek Techology Co Ltd
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2020-04-21
Also published as: WO2021128788A1

Abstract

The invention discloses a vibration device and an electronic product, wherein the vibration device comprises a shell, a vibration sensor and a control unit, wherein the shell is provided with a cavity; the vibration device also comprises a vibrator component, a stator component and an elastic element, wherein the vibrator component is arranged in the cavity and comprises a permanent magnet; the stator assembly is arranged in the cavity and comprises a coil assembly; the vibrator assembly is suspended in the cavity through the elastic element; the coil assembly comprises 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 enable the vibrator assembly to generate reciprocating vibration through electromagnetic action; the annular frame is made of conductive and non-magnetic materials and is configured to resist vibration of the vibrator assembly.

Description

Vibrating device and electronic product

Technical Field

The invention relates to the technical field of electronic products, in particular to a vibrating device and an electronic product.

Background

The vibration device usually realizes the reciprocating regular vibration through the vibration component, the vibration experience is shown not only in the magnitude of the natural frequency and the vibration acceleration, but also in the response speed (namely the time of the vibration frequency rising and falling of the product), and the performance parameters of the response speed of the vibration device are influenced by the damping of the designed product. For example, because the linear vibration motor has inherent simple harmonic vibration characteristics, its own internal damping is not enough to meet the take-off and landing time requirements, so that additional damping is required to make the start and stop time shorter, and thus the displacement control and reliability of the vibration to reach a steady state are higher.

The existing vibration device is generally provided with damping such as foam, silica gel, magnetic liquid and the like. The damping has the defects of nonlinearity, poor controllability of damping size, easy fatigue damage, poor durability, large damping sound, high assembly difficulty and the like. For example, the magnetic liquid has poor stability in the high-temperature and low-temperature alternating environment, and the foaming pores of silica gel or foam are easy to deform irreversibly in the high-temperature environment. Therefore, the damping of the existing vibration device is greatly influenced by the assembly precision of the product, the product performance consistency is poorer, and the stability of the damping characteristic is poor in the high-temperature and low-temperature alternative environment, so that the reliability of the product is easily reduced.

In view of the above, a new technical solution is needed to solve the above technical problems.

Disclosure of Invention

The invention aims to provide a novel technical scheme of a vibration device and an electronic product.

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

a housing having a cavity;

a vibrator assembly disposed within a cavity, the vibrator assembly comprising a permanent magnet;

a stator assembly disposed within the cavity, the stator assembly including a coil assembly;

a spring element by which the vibrator assembly is suspended in the cavity;

the coil assembly comprises 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 enable the vibrator assembly to generate reciprocating vibration through electromagnetic action; the annular frame is made of conductive and non-magnetic materials and is configured to resist vibration of the vibrator assembly.

Optionally, a through hole is formed in the middle of the coil, the coil assembly further includes a core embedded in the through hole of the coil, the core is made of a conductive and non-conductive material, and the core is configured to block vibration of the vibrator assembly.

Optionally, the electrically conductive and non-magnetic conductive material comprises one of copper, aluminum, nichrome.

Optionally, the vibrator assembly further comprises a weight block connected with the permanent magnet.

Optionally, be provided with on the balancing weight and hold the chamber, the permanent magnet sets up in holding the intracavity.

Optionally, two elastic elements are provided, and the two elastic elements are respectively located at two sides of the balancing weight along the vibration direction of the vibrator component.

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

Optionally, the vibration device further includes a magnetic conduction plate, and the magnetic conduction plate is connected to the permanent magnet.

Optionally, the vibration device further comprises an FPC, which is connected to the coil assembly.

According to another aspect of the present invention, there is provided an electronic product including the vibration device as described above.

According to the vibration device provided by the embodiment of the invention, the annular frame made of the conductive and non-magnetic material is sleeved outside the coil, and the annular frame and the coil are used as a part of the stator component to be fixed, namely, the annular frame and the coil do reverse motion relative to the vibrator component, so that the annular frame can generate dynamic electromotive force under a moving magnetic field, and thus induced current is generated, the induced current can react on the vibrator component, and a damping effect is generated on the vibrator component, so that the starting and braking time of the vibration device is short, and the noise of the vibration device is reduced. Compared with the traditional damping parts such as foam, silica gel and magnetic liquid, the annular frame made of the conductive and non-magnetic-conductive materials has the advantage of strong performance stability in high-temperature and low-temperature alternate environments, and the performance consistency of the product is greatly improved.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying 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.

Fig. 1 is an exploded view of a vibration device according to the present invention;

fig. 2 is a schematic cross-sectional structural view of a vibration device provided in the present invention;

FIG. 3 is a schematic view of a portion of a vibration device according to the present invention;

FIG. 4 is a first partial structural diagram of a vibration device with two coils;

FIG. 5 is a second partial structural diagram of a vibrating device with two coils;

fig. 6 is a schematic diagram of a permanent magnet and a coil corresponding to two coils.

Detailed Description

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

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

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

An embodiment of the present invention provides a vibration device, which is shown in fig. 1 and fig. 2, and includes a housing, where the housing has a cavity; the vibration device also comprises a vibrator component, a stator component and an elastic element, wherein the vibrator component is arranged in the cavity and comprises a permanent magnet 1; the stator assembly is arranged in the cavity and comprises a coil 2 assembly; the vibrator assembly is suspended in the cavity through the elastic element; the coil 2 assembly comprises 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 enable the vibrator assembly to generate reciprocating vibration through electromagnetic action; the annular frame 3 is made of an electrically conductive and non-magnetic material, and the annular frame 3 is configured to block vibration of the vibrator assembly.

In the vibration device provided by the embodiment of the invention, the annular frame 3 made of conductive and non-magnetic material is sleeved outside the coil 2, the coil 2 is positioned in the magnetic field generated by the permanent magnet 1 to cut the magnetic induction line, and when alternating current signals are introduced into the coil 2, the coil 2 and the permanent magnet 1 can interact to generate Lorentz force. Wherein, permanent magnet 1 is used for forming the magnetic field, and permanent magnet 1 can be ferrite magnet or neodymium iron boron magnet, and permanent magnet 1's shape can be designed according to actual need as long as the processing of being convenient for can, for example, cuboid, cylinder, prism etc.. The vibrator assembly reciprocates under the action of 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, namely, the stator assembly moves reversely, so that the annular frame 3 can generate dynamic electromotive force under a moving magnetic field to generate induced current, and the induced current can react on the vibrator assembly to generate a damping effect on the vibrator assembly, so that the starting and braking time of the vibration device is short, and the noise of the vibration device is reduced. Compared with the traditional damping parts such as foam, silica gel and magnetic liquid, the annular frame 3 made of conductive and non-magnetic materials adopted by the embodiment of the invention has the advantage of strong performance stability in high-low temperature alternate environment, and the performance consistency of the product is greatly improved. In addition, the coil 2 bracket can also play a role in limiting and protecting the coil 2.

Referring to fig. 1 and 3, in one embodiment, a through hole is formed in the middle of the coil 2, the coil 2 is wound by a conducting wire in one direction to form a closed ring structure, a routing area of the coil 2 is around the through hole in the middle of the coil, the routing area refers to an area where a lead in the coil 2 actually passes through, and the whole routing area is in a ring shape. The coil 2 assembly further comprises a core 4, the core 4 is embedded in the through hole of the coil 2, the core 4 is made of an electric conduction material and a non-magnetic conduction material, and the core 4 is configured to block vibration of the vibrator assembly.

The core 4 made of a conductive and non-conductive material can play the same role as the ring frame 3, and the core 4 can reinforce the induction effect of the motional electromotive force, thereby increasing the reaction force to the permanent magnet 1 and enhancing the damping effect to the vibrator assembly.

In addition, the annular frame 3 and the core 4 in the embodiment of the present invention are also applicable to a multiple drive coil scheme. Referring to fig. 4, for example, in a vibration device provided with a coil 2 and a coil 2 ', a ring frame 3 may be respectively sleeved outside the coil 2 and the coil 2 ', and a core 4 may be respectively embedded in through holes of the coil 2 and the coil 2 '; referring to fig. 5, it is also possible to provide a ring frame 3, the ring frame 3 has two annular through holes respectively matching with the coils 2 and 2 ', the coils 2 and 2 ' are respectively arranged in the two annular through holes, and a core 4 is respectively embedded in the through holes of the coils 2 and 2 '. Referring to fig. 6, in the vibration device provided with two coils (coil 2 and coil 2'), three groups of permanent magnets, permanent magnet 1-1, permanent magnet 1-2 and permanent magnet 1-3 shown in fig. 6, are provided corresponding to the two coils. The direction of the arrows in fig. 6 represents the magnetizing direction of each permanent magnet, and the current directions of the coil 2 and the coil 2' are opposite, so that the current directions of the two ring frames 3 are also opposite as shown in fig. 4; as shown in fig. 5, the current directions around the two annular through holes of the annular frame 3 are also opposite.

In one embodiment, the electrically conductive and non-magnetic conductive material comprises one of copper, aluminum, and nichrome. The conductive and non-conductive materials of copper, aluminum and nickel-chromium alloy have low manufacturing cost and are beneficial to controlling the cost in the mass production. Of course, in the vibration device according to the embodiment of the present invention, the materials of the ring frame 3 and the core 4 are not limited to copper, aluminum, and nichrome, as long as the conductive and non-magnetic properties are satisfied.

Referring to fig. 1 and 2, in one embodiment, the vibrator assembly further includes a weight 5, and the weight 5 is connected to the permanent magnet 1. The balancing weight 5 is used for increasing the inertia of the vibrator component so as to improve the vibration sense, and the balancing weight 5 is made of magnetic conductivity materials.

In one embodiment, the weight block 5 is provided with a containing cavity 51, and the permanent magnet 1 is arranged in the containing cavity 51. The provision of the housing chamber 51 facilitates the miniaturization and the light weight design of the vibration device.

In one embodiment, two elastic members are provided, and two elastic members are respectively located at both sides of the weight 5 along the vibration direction of the vibrator assembly. The elastic element can generate damping and buffering effects and provide restoring force and buffering effects for vibration of the vibrator assembly.

In one embodiment, the elastic element is a V-shaped elastic sheet 6, one side surface of the V-shaped elastic sheet 6 is connected with the counterweight 5, and the other side surface is connected with the inner side wall of the housing. Alternatively, both sides of the weight 5 in the vibration direction of the vibrator assembly may be designed to be wedge-shaped to match the shape of the V-shaped spring 6. That is, the thickness of the portion of the side portion of the weight 5 connected to the opening portion of the V-shaped spring 6 is large, and the thickness of the portion of the side portion of the weight 5 connected to the connecting portion of the V-shaped spring 6 is small. Design like this can form dodging V type shell fragment 6, and this makes V type shell fragment 6's range of stretching out and drawing back bigger. And the space of the cavity in the shell is saved, which is beneficial to the miniaturization and light and thin design of the vibration device. It is understood that the elastic element is not limited to the V-shaped elastic sheet 6, but may be an elastic sheet with other shapes and structures, an elastic rubber member, a spring, and the like.

Referring to fig. 1 and 2, 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 conduction plate 7 has the functions of converging and concentrating the magnetic field generated by the permanent magnet 1, and corrects and gathers magnetic induction lines emitted by the permanent magnet 1, so that the magnetic field intensity is improved, and the magnetic leakage is reduced.

Referring to fig. 1 and 2, in one embodiment, the vibration device further includes an FPC8, and the FPC8 is connected to the coil 2 assembly. Specifically, the FPC8 is used for the coil 2 to conduct with an external circuit to transmit an electric signal. For example, the lead wires of the coil 2 are connected to the FPC8, and the FPC8 is connected to the main control chip. The arrangement of the FPC8 enables the signal transmission effect of the vibration device to be better and the service life of the vibration device to be long.

Referring to fig. 1, in one embodiment, the housing includes an upper case 9 and a lower case 10, optionally, wherein the upper case 9 is a cylindrical structure with one end open, the lower case 10 is a plate-shaped structure and is covered at the open end of the upper case 9, and an FPC8 is provided at the inner surface of the lower case 10. The shell with the structure is convenient to process, and the stator assembly and the vibrator assembly are convenient to mount. The shape of the entire housing is a rectangular parallelepiped, but in other embodiments, the housing may be a substantially rectangular parallelepiped, such as an oval, a racetrack, or the like. The material of the housing may be, but is not limited to, metal, plastic, ceramic, etc. In an alternative embodiment, the upper casing 9 is made of a magnetic conductive material, and the magnetic leakage can be reduced by selecting the upper casing 9 made of the magnetic conductive material.

The embodiment of the invention also provides an electronic product which comprises the vibration device. The electronic product may be, for example, an electronic device such as a mobile phone, a game machine, a notebook computer, a wearable device, or an intercom. The vibration device can be a linear vibration motor, for example, and can also be an exciter used for driving the screen of the mobile phone to vibrate and sound.

Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A vibratory apparatus, comprising:

a housing having a cavity;

a spring element by which the vibrator assembly is suspended in the cavity;

2. The vibration apparatus as claimed in claim 1, wherein the coil has a through hole at a central portion thereof, the coil assembly further comprises a core embedded in the through hole of the coil, the core being made of a conductive and non-conductive material, the core being configured to block vibration of the vibrator assembly.

3. The vibratory device of claim 2 wherein the electrically conductive and non-magnetic material comprises one of copper, aluminum, nichrome.

4. The vibration apparatus of claim 1 wherein the vibrator assembly further comprises a weight connected to the permanent magnet.

5. The vibration apparatus as claimed in claim 4, wherein the weight member is provided with a receiving cavity, and the permanent magnet is disposed in the receiving cavity.

6. The vibration apparatus as claimed in claim 4, wherein there are two elastic members, and the two elastic members are respectively located at both sides of the weight block in the vibration direction of the vibrator assembly.

7. The vibration apparatus as claimed in claim 6, wherein the elastic member is a V-shaped spring.

8. The vibratory device of claim 1 further comprising a magnetically permeable plate coupled to the permanent magnet.

9. The vibration device as recited in claim 1, further comprising an FPC, the FPC being connected to the coil assembly.

10. An electronic product, characterized in that it comprises a vibration device according to any one of claims 1 to 9.