Linear vibration motor and electronic device

Abstract

The present invention relates to the technical field of motors, and specifically relates to a linear vibration motor and an electronic device. The linear vibration motor comprises a housing, and a stator assembly, a vibrator assembly and a conductive member accommodated in the housing, wherein the vibrator assembly vibrates in a first direction. The vibrator assembly comprises first magnets, second magnets and third magnets, wherein two first magnets are arranged in a second direction perpendicular to the first direction; two second magnets are respectively arranged on two sides of the two first magnets in the first direction; two third magnets are respectively arranged on two sides of the two second magnets in the first direction; and a coil of the stator assembly and the conductive member are respectively arranged at two ends of the vibrator assembly in the second direction, and two driving edges of the coil are arranged opposite the two second magnets in the second direction. By means of the structure, the magnetic field utilization rate of the vibrator assembly can be increased, thereby improving the driving force of the linear vibration motor and shortening the start-stop time of the linear vibration motor.

Description

Linear vibration motor and electronic device TECHNICAL FIELD

[0001] The present application relates to the technical field of motor, and in particular to a linear vibration motor and electronic device. BACKGROUND

[0002] With the development of communication technology, portable electronic products, such as mobile phones, handheld game consoles, VA / VR devices, etc., have entered people's lives. In these portable electronic products, a micro vibration motor is generally used for system feedback. The existing micro vibration motor generally includes an upper cover, a lower cover forming a vibration space with the upper cover, a vibrator doing linear reciprocating vibration in the vibration space, an elastic support connecting the upper cover and enabling the vibrator to do reciprocating vibration, and a stator coil located at a distance from one end below the vibrator.

[0003] However, the magnetic field utilization rate of the vibrator assembly in the above vibration motor is low, and the start-stop time is relatively long, so that the product cannot achieve the required performance.

[0004] Therefore, in view of the above shortcomings, the present application is proposed. SUMMARY

[0005] The present application aims to provide a linear vibration motor and electronic device to solve the problem of low magnetic field utilization rate of the vibrator assembly in the prior art.

[0006] The present application provides a linear vibration motor in a first aspect, comprising a shell, and a stator assembly, a vibrator assembly and a conductive sheet accommodated in the shell, the vibrator assembly vibrates along a first direction; wherein,

[0007] The vibrator assembly comprises two first magnets, two second magnets and two third magnets, the two first magnets are arranged along a second direction perpendicular to the first direction, and the magnetization directions of the two first magnets are opposite and parallel to the first direction; the two second magnets are arranged on the two sides of the two first magnets along the first direction, and the magnetization directions of the two second magnets are opposite and parallel to the second direction; the two third magnets are arranged on the two sides of the two second magnets along the first direction, and the magnetization directions of the two third magnets are the same and parallel to the first direction;

[0008] The stator assembly comprises a coil, the coil and the conductive sheet are arranged on the two sides of the vibrator assembly along the second direction and fixed to the shell, and the two driving edges of the coil are arranged opposite to the two second magnets along the second direction.

[0009] The linear vibration motor provided by the present application can further have the following additional technical features:

[0010] In one specific embodiment of the present application, the conductive sheet is a copper sheet.

[0011] In one specific embodiment of the present application, the vibrator assembly further comprises a mass block, the mass block is provided with a through hole extending along the second direction and a cross beam arranged in the through hole; the first magnets, the second magnets and the third magnets are arranged in the through hole, and two of the first magnets are arranged on two sides of the cross beam along the second direction, and two of the second magnets are arranged on two sides of the cross beam along the first direction.

[0012] In one specific embodiment of the present application, a plurality of elastic supports are further included, the plurality of elastic supports are arranged on two ends of the vibrator assembly along the first direction, and one end of each of the elastic supports is connected with the shell and the other end is connected with the mass block.

[0013] In one specific embodiment of the present application, the elastic support is a spring sheet, the spring sheet comprises a first connecting portion, a second connecting portion and a vibration portion connected between the first connecting portion and the second connecting portion, the first connecting portion is used for connecting with the mass block, and the second connecting portion is used for connecting with the shell.

[0014] In one specific embodiment of the present application, a first stop block is arranged on a side of the first connecting portion away from the mass block, and a second stop block is arranged on each of two sides of the second connecting portion.

[0015] In one specific embodiment of the present application, protruding portions are arranged on two ends of the mass block along the first direction.

[0016] In one specific embodiment of the present application, relief grooves are formed on two sides of the mass block perpendicular to the second direction.

[0017] In one specific embodiment of the present application, the shell is a magnetic conductive shell.

[0018] The second aspect of the present application further provides an electronic device comprising the linear vibration motor according to any one of the above.

[0019] The linear vibration motor provided by the present application drives the vibrator assembly to vibrate along the first direction by arranging the stator assembly, the vibrator assembly and the conductive sheet in the shell and cooperating the stator assembly with the conductive sheet, thereby realizing the vibration feedback of the linear vibration motor. Meanwhile, the first magnets, the second magnets and the third magnets are arranged to form a double-Halbach array magnetic circuit arranged side by side along the second direction, so that the magnetic lines of force are gathered on two sides of the vibrator assembly along the second direction, thereby improving the magnetic field utilization rate, improving the driving force of the linear vibration motor and effectively reducing the start-stop time of the product. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application or the prior art, the attached drawings needed to be used in the specific embodiments or prior art description will be briefly introduced. Obviously, the attached drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0021] Fig. 1 is a sectional view of a linear vibration motor according to the present application.

[0022] Fig. 2 is an exploded view of the linear vibration motor.

[0023] BRIEF DESCRIPTION OF DRAWINGS 100 - linear vibration motor; 10 - housing, 11 - upper housing, 12 - lower housing; 20 - vibrator assembly, 21 - first magnet, 22 - second magnet, 23 - third magnet, 24 - mass, 25 - through hole, 26 - cross beam, 27 - avoiding groove, 28 - protrusion; 30 - elastic support, 41 - first stopper, 42 - second stopper; 50 - stator assembly, 51 - coil, 52 - FPCB; 60 - conductive sheet. DETAILED DESCRIPTION

[0024] Exemplary embodiments of the present application will be described more fully hereinafter with reference to the accompanying drawings. While example embodiments of the present application are shown in the drawings, it is understood that the present application can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.

[0025] It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order in which they are described, unless specifically identified as an order dependent step. It is also to be understood that additional or alternative steps can be employed.

[0026] Although the terms first, second, third, etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can be only used to distinguish one element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms when used in the singular or plural herein do not imply a sequence or order unless the context clearly indicates otherwise. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

[0027] Spatially relative terms are used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as depicted in the figures. These relative terms, e.g. "internal", "external", "lateral", "longitudinal", "upper", "lower", "above", "below", and the like, can encompass different positions of the device in use or operation in addition to the positions depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below" can encompass both an up and down orientation. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0028] A linear vibration motor 100 is provided in a first aspect of the present application, comprising a housing 10, a stator assembly 50, a vibrator assembly 20 and a conductive sheet 60 received in the housing 10, the stator assembly 50 being capable of cooperating with the conductive sheet 60 to drive the vibrator assembly 20 to vibrate in a first direction.

[0029] The vibrator assembly 20 comprises two first magnets 21, two second magnets 22 and two third magnets 23, the two first magnets 21 being arranged along a second direction perpendicular to the first direction, and the two first magnets 21 having opposite magnetization directions and parallel to the first direction; the two second magnets 22 being arranged on two sides of the two first magnets 21 along the first direction, and the two second magnets 22 having opposite magnetization directions and parallel to the second direction; the two third magnets 23 being arranged on two sides of the two second magnets 22 along the first direction, and the two third magnets 23 having the same magnetization direction and parallel to the first direction; the stator assembly 50 comprises a coil 51, the coil 51 and the conductive sheet 60 being arranged on two sides of the vibrator assembly 20 along the second direction and fixed to the housing 10, and two driving edges of the coil 51 being arranged opposite to the two second magnets 22 along the second direction.

[0030] Specifically, the linear vibration motor 100 is roughly cuboid in shape, that is, the shell 10 is roughly cuboid, and the length direction of the shell 10 is the long axis, the width direction is the short axis, and the thickness direction is the Z axis. The first direction is parallel to the long axis direction, the second direction is parallel to the Z axis direction, and the third direction is parallel to the short axis direction.

[0031] The stator assembly 50 includes a coil 51, and the coil 51 and the conductive sheet 60 are fixed to the opposite two sides of the shell 10 perpendicular to the second direction. The vibrator assembly 20 is supported between the stator assembly 50 and the conductive sheet 60 and can vibrate in the first direction under the drive of the stator assembly 50 and the conductive sheet 60 to realize vibration feedback. The two drive edges of the coil 51 are arranged opposite to the two second magnets 22 in the second direction, so that the magnetic lines pass through the coil 51 more, and the driving force is improved.

[0032] The two first magnets 21 in the vibrator assembly 20 are arranged in the first direction in the form of a Halbach array with the two second magnets 22 and the two third magnets 23. Since the two first magnets 21 are arranged in the second direction, the vibrator assembly 20 forms a double Halbach array magnetic circuit arranged side by side in the second direction, so that the magnetic lines are concentrated on both sides of the vibrator assembly 20 in the second direction, thereby improving the magnetic field utilization rate, improving the driving force of the linear vibration motor 100, and effectively reducing the start-stop time of the product.

[0033] That is, the linear vibration motor 100 provided by the present application drives the vibrator assembly 20 to vibrate in the first direction by arranging the stator assembly 50, the vibrator assembly 20, and the conductive sheet 60 in the shell 10, and driving the vibrator assembly 20 to vibrate in the first direction by cooperating the stator assembly 50 with the conductive sheet 60, thereby realizing the vibration feedback of the linear vibration motor 100. At the same time, by arranging the first magnet 21, the second magnet 22, and the third magnet 23 and forming a double Halbach array magnetic circuit arranged side by side in the second direction, the magnetic lines are concentrated on both sides of the vibrator assembly 20 in the second direction, thereby improving the magnetic field utilization rate, improving the driving force of the linear vibration motor 100, and effectively reducing the start-stop time of the product.

[0034] In one specific embodiment of the present application, the conductive sheet 60 is a copper sheet. Specifically, the conductive sheet 60 generates eddy current to cut the magnetic induction lines in the changing magnetic field, generating a force that hinders the movement of the vibrator assembly 20, providing electromagnetic damping for the vibration of the linear vibration motor 100, so that the motor responds faster when starting and stopping, and can tend to stable vibration faster when vibrating, and the frequency band can be wider. Preferably, the conductive sheet is a copper sheet, which has better conductivity, thereby further improving the performance of the conductive sheet 50.

[0035] The two sides of the vibrator assembly 20 perpendicular to the second direction are both planes.

[0036] In one specific embodiment of the present application, the vibrator assembly 20 further comprises a mass 24, the mass 24 is provided with a through hole 25 extending along the second direction and a cross beam 26 arranged in the through hole 25; the first magnet 21, the second magnet 22 and the third magnet 23 are all arranged in the through hole 25, and the two first magnets 21 are arranged on the two sides of the cross beam 26 along the second direction, and the two second magnets 22 are arranged on the two sides of the cross beam 26 along the first direction. The mass 24 is used to increase the counterweight of the vibrator assembly 20, thereby improving the vibration feedback effect of the linear vibration motor 100, and is also used to mount the first magnet 21, the second magnet 22 and the third magnet 23.

[0037] Specifically, the mass 24 is a cuboid structure, and the middle part is provided with the through hole 25 with a rectangular cross section along the second direction, the middle part of the through hole 25 is provided with the cross beam 26 with a rectangular cross section along the third direction, and the two ends of the cross beam 26 extend to the two side walls of the through hole 25, respectively. The width of the cross beam 26 along the first direction is equal to that of the first magnet 21, so that the first magnet 21 can be fixed through the two side surfaces along the second direction; the two sides of the cross beam 26 along the first direction are connected with one second magnet 22, respectively, and the third magnet 23 is arranged in the space formed by the second magnet 22 and the through hole 25.

[0038] In order to strengthen the connection, the first magnet 21, the second magnet 22 and the third magnet 23 are further connected and fixed with the inner wall of the through hole 25 through other side walls.

[0039] In one specific embodiment of the present application, a plurality of elastic supporting members 30 are arranged on the two ends of the vibrator assembly 20 along the first direction, and one end of each elastic supporting member 30 is connected with the shell 10, and the other end is connected with the mass 24.

[0040] Specifically, the number of elastic supporting members 30 is two, and the two elastic supporting members 30 are arranged on the two ends of the vibrator assembly 20, and are used to connect the shell 10 and the mass to support the vibrator assembly 20 in the inner cavity of the shell 10, so that the vibrator assembly 20 has displacement in the first direction to realize vibration feedback.

[0041] In one specific embodiment of the present application, the elastic supporting member 30 is a spring piece, which comprises a first connecting part, a second connecting part and a vibration part connected between the first connecting part and the second connecting part, the first connecting part is used to connect with the mass 24, and the second connecting part is used to connect with the shell 10.

[0042] Specifically, the vibration part can be formed in a shape of a character, a Z shape, a V shape, a U shape or an S shape, and in the present embodiment, the vibration part is formed in a V shape, and the first connecting part and the second connecting part are arranged at the opening ends of the V-shaped structure, respectively.

[0043] In one specific embodiment of the present application, the first connecting portion is provided with a first stopper 41 on the side away from the mass 24, and the second connecting portion is provided with a second stopper 42 on both sides. The first stopper 41 and the second stopper 42 can enhance the connection strength between the elastic support 30 and the housing 10 and the mass 24, thereby improving the structural strength of the linear vibration motor 100.

[0044] In one specific embodiment of the present application, the mass 24 is provided with a protruding portion 28 at both ends in the first direction. Specifically, the end face of the protruding portion 28 away from the mass 24 is a plane adapted to the housing 10 at the corresponding position, so that the vibrator assembly 20 can abut against the housing 10 through the protruding portion 28 at the limit amplitude, thereby reducing the damage to the elastic support 30 and ensuring the reliability of the linear vibration motor 100.

[0045] In one specific embodiment of the present application, the two side faces of the mass 24 perpendicular to the second direction are formed with a relief groove 27. Specifically, the relief groove 27 is used to avoid the metal sheet and the stator assembly 50.

[0046] In one specific embodiment of the present application, the stator assembly 50 further comprises an FPCB 52 electrically connected to the coil 51, wherein the coil is annular, fixed to the side face of the housing 10 perpendicular to the second direction, and the width of the coil in the first direction is equal to or slightly smaller than the width of the through hole 25 in the first direction.

[0047] The housing 10 comprises an upper shell 11 with an opening and a lower shell 12 adapted to be connected to the opening of the upper shell 11, and the upper shell 11 and the lower shell 12 are adapted to form a receiving cavity for accommodating the vibrator assembly 20, the stator assembly 50 and the conductive sheet 60.

[0048] In one specific embodiment of the present application, the housing 10 is a magnetic conductive shell. In this way, the magnetic circuit formed by the vibrator assembly 20 is closed, thereby reducing the magnetic leakage and further improving the utilization efficiency of the magnetic field in the vibrator assembly 20.

[0049] The second aspect of the present application also provides an electronic device comprising the linear vibration motor 100 of any one of the above. Specifically, the electronic device in the present embodiment can be a mobile phone, a tablet, a computer, and a smart watch, a smart wearable device such as VA and VR, etc.

[0050] The structure of the linear vibration motor 100 refers to the above embodiments. Since the electronic device of the present embodiment has all the technical features of the linear vibration motor 100 described above, it also has at least all the beneficial effects of the linear vibration motor 100 described above.

[0051] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A linear vibration motor, characterized in that, It includes a housing and a stator assembly, an oscillator assembly, and conductive plates housed within the housing, wherein the oscillator assembly vibrates along a first direction; wherein, The oscillator assembly includes two first magnets, two second magnets, and two third magnets. The two first magnets are arranged along a second direction perpendicular to the first direction, and the magnetization directions of the two first magnets are opposite and both parallel to the first direction. The two second magnets are arranged on both sides of the two first magnets along the first direction, and the magnetization directions of the two second magnets are opposite and both parallel to the second direction. The two third magnets are arranged on both sides of the two second magnets along the first direction, and the magnetization directions of the two third magnets are the same and both parallel to the first direction. The stator assembly includes a coil, and the coil and the conductive sheet are respectively disposed on both sides of the oscillator assembly along the second direction and fixed to the housing. The two driving edges of the coil are respectively disposed opposite to the two second magnets along the second direction.

2. The linear vibration motor according to claim 1, characterized in that, The conductive sheet is a copper sheet.

3. The linear vibration motor according to claim 1, characterized in that, The oscillator assembly further includes a mass block, which has a through hole extending along a second direction and a crossbeam mounted in the through hole; the first magnet, the second magnet and the third magnet are all disposed in the through hole, and the two first magnets are disposed on both sides of the crossbeam along the second direction, and the two second magnets are disposed on both sides of the crossbeam along the first direction.

4. The linear vibration motor according to claim 3, characterized in that, It also includes multiple elastic support members, which are respectively disposed at both ends of the oscillator assembly in the first direction, and one end of each elastic support member is connected to the housing and the other end is connected to the mass block.

5. The linear vibration motor according to claim 4, characterized in that, The elastic support is a spring sheet, which includes a first connecting part, a second connecting part, and a vibrating part connected between the first connecting part and the second connecting part. The first connecting part is used to connect with the mass block, and the second connecting part is used to connect with the housing.

6. The linear vibration motor according to claim 5, characterized in that, The first connecting part has a first stop block on the side away from the mass block, and the second connecting part has second stops on both sides.

7. The linear vibration motor according to claim 3, characterized in that, The mass block has protrusions at both ends along the first direction.

8. The linear vibration motor according to claim 3, characterized in that, The mass block has clearance grooves formed on its two sides perpendicular to the second direction.

9. The linear vibration motor according to claim 1, characterized in that, The housing is a magnetically conductive housing.

10. An electronic device, characterized in that, Includes the linear vibration motor according to any one of claims 1-9.

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