Linear vibration motor and electronic device

Abstract

The utility model relates to the technical field of motors, in particular to a linear vibration motor and electronic equipment, the linear vibration motor comprises a shell, a stator assembly, a vibrator assembly and a conducting strip, the stator assembly, the vibrator assembly and the conducting strip are accommodated in the shell, and the vibrator assembly vibrates along a first direction; wherein the vibrator assembly comprises first magnets, second magnets and third magnets, and the two first magnets are arranged in the second direction perpendicular to the first direction; the two second magnets are arranged on the two sides of the two first magnets respectively in the first direction. The two third magnets are arranged on the two sides of the two second magnets respectively in the first direction. A coil and a conducting strip of the stator assembly are arranged at the two ends, in the second direction, of the vibrator assembly respectively, and two driving edges of the coil are arranged opposite to the two second magnets in the second direction. The above structure can improve the magnetic field utilization rate of the vibrator assembly, thereby improving the driving force of the linear vibration motor, and reducing the start-stop time of the linear vibration motor.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a linear vibration motor and an electronic device. Background Art

[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, micro vibration motors are generally used for system feedback. Existing micro vibration motors generally include an upper cover, a lower cover that forms a vibration space with the upper cover, a vibrator that performs linear reciprocating vibrations in the vibration space, an elastic support member that connects the upper cover and enables the vibrator to perform reciprocating vibrations, and a stator coil located at one end below the vibrator.

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

[0004] Therefore, in view of the above shortcomings, the present utility model is proposed. Utility Model Content

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

[0006] The utility model provides a linear vibration motor in a first aspect, comprising a housing and a stator assembly, a vibrator assembly and a conductive sheet contained in the housing, wherein the vibrator assembly vibrates along a first direction; wherein:

[0007] The vibrator assembly comprises a first magnet, a second magnet and a third magnet, each of which is two in number. 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 are 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 are 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 are parallel to the first direction;

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

[0009] The linear vibration motor provided by the utility model may also have the following additional technical features:

[0010] In a specific implementation manner of the present invention, the conductive sheet is a copper sheet.

[0011] In a specific embodiment of the utility model, the vibrator assembly also includes a mass block, which is provided with a through hole extending along the second direction and a beam arranged in the through hole; the first magnet, the second magnet and the third magnet are all arranged in the through hole, and the two first magnets are arranged on both sides of the beam along the second direction, and the two second magnets are arranged on both sides of the beam along the first direction.

[0012] In a specific embodiment of the utility model, it also includes a plurality of elastic support members, which are arranged at both ends of the vibrator assembly in the first direction, and one end of each of the elastic support members is connected to the shell, and the other end is connected to the mass block.

[0013] In a specific embodiment of the utility model, the elastic support member is a spring sheet, which includes 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 to the mass block, and the second connecting part is used to connect to the shell.

[0014] In a specific implementation manner of the utility model, a first stopper is provided on a side of the first connecting portion facing away from the mass block, and second stops are provided on both sides of the second connecting portion.

[0015] In a specific implementation manner of the present invention, protrusions are provided at two ends of the mass block along the first direction.

[0016] In a specific implementation manner of the utility model, avoidance grooves are formed on two side surfaces of the mass block that are perpendicular to the second direction.

[0017] In a specific implementation manner of the present invention, the shell is a magnetic conductive shell.

[0018] The second aspect of the utility model further provides an electronic device, comprising any one of the linear vibration motors described above.

[0019] The linear vibration motor provided by the utility model realizes vibration feedback of the linear vibration motor by arranging a stator assembly, a vibrator assembly and a conductive sheet in a shell, and utilizing the stator assembly and the conductive sheet to cooperate to drive the vibrator assembly to vibrate along a first direction. At the same time, by arranging a first magnet, a second magnet and a third magnet, and forming a double Halbach array magnetic circuit arranged side by side along a second direction, the magnetic lines of force are gathered on both sides of the vibrator assembly in the second direction, thereby improving the utilization rate of the magnetic field, improving the driving force of the linear vibration motor, and effectively reducing the start and stop time of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a cross-sectional view of the linear vibration motor in the utility model;

[0022] Figure 2 An exploded view of the linear vibration motor.

[0023] Description of reference numerals:

[0024] 100-Linear vibration motor;

[0025] 10-housing, 11-upper shell, 12-lower shell;

[0026] 20-vibrator assembly, 21-first magnet, 22-second magnet, 23-third magnet, 24-mass block, 25-through hole, 26-crossbeam, 27-avoidance groove, 28-protrusion;

[0027] 30-elastic support member, 41-first stopper, 42-second stopper;

[0028] 50-stator assembly, 51-coil, 52-FPCB;

[0029] 60-Conductive sheet. DETAILED DESCRIPTION

[0030] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0031] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0032] Although the terms first, second, third, etc. can be used in the text to describe multiple 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 only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0033] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0034] The first aspect of the utility model provides a linear vibration motor 100, including a shell 10 and a stator assembly 50, a vibrator assembly 20 and a conductive sheet 60 accommodated in the shell 10. The stator assembly 50 can cooperate with the conductive sheet 60 to drive the vibrator assembly 20 to vibrate along a first direction.

[0035] Among them, the vibrator assembly 20 includes a first magnet 21, a second magnet 22 and a third magnet 23, each of which is two in number. The two first magnets 21 are arranged along a second direction perpendicular to the first direction, and the magnetization directions of the two first magnets 21 are opposite and parallel to the first direction; the two second magnets 22 are arranged on both sides of the two first magnets 21 along the first direction, and the magnetization directions of the two second magnets 22 are opposite and parallel to the second direction; the two third magnets 23 are arranged on both sides of the two second magnets 22 along the first direction, and the magnetization directions of the two third magnets 23 are the same and parallel to the first direction; the stator assembly 50 includes a coil 51, the coil 51 and the conductive sheet 60 are arranged on both sides of the vibrator assembly 20 along the second direction and fixed to the shell 10, and the two driving edges of the coil 51 are respectively arranged opposite to the two second magnets 22 along the second direction.

[0036] Specifically, the shape of the linear vibration motor 100 is roughly a rectangular parallelepiped, that is, the shell 10 is roughly a rectangular parallelepiped, with the length direction of the shell 10 as the major axis, the width direction as the minor axis, and the thickness direction as the Z axis. The first direction is parallel to the major axis direction, the second direction is parallel to the Z axis direction, and the third direction is parallel to the minor axis direction.

[0037] The stator assembly 50 includes a coil 51, and the coil 51 and the conductive sheet 60 are fixed to two opposite sides of the housing 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 along the first direction to achieve vibration feedback under the drive of the stator assembly 50 and the conductive sheet 60. The two driving edges of the coil 51 are respectively arranged opposite to the two second magnets 22 along the second direction, so that more magnetic lines of force pass through the coil 51, thereby improving the driving force.

[0038] The two first magnets 21 in the vibrator assembly 20 are arranged in a Halbach array along the first direction with the two second magnets 22 and the two third magnets 23 respectively. Since the two first magnets 21 are arranged along the second direction, the vibrator assembly 20 forms a double Halbach array magnetic circuit arranged side by side along the second direction, so that the magnetic lines of force are gathered on both sides of the second direction of the vibrator assembly 20, thereby improving the utilization rate of the magnetic field, increasing the rated driving force of the linear vibration motor 100, and effectively reducing the start and stop time of the product.

[0039] That is, the linear vibration motor 100 provided by the utility model is provided with a stator assembly 50, a vibrator assembly 20 and a conductive sheet 60 in a shell 10, and the stator assembly 50 cooperates with the conductive sheet 60 to drive the vibrator assembly 20 to vibrate along a first direction, thereby realizing vibration feedback of the linear vibration motor 100. At the same time, by providing a first magnet 21, a second magnet 22 and a third magnet 23, and forming a double Halbach array magnetic circuit arranged side by side along a second direction, the magnetic lines of force are gathered on both sides of the vibrator assembly 20 in the second direction, thereby improving the utilization rate of the magnetic field, improving the driving force of the linear vibration motor 100, and effectively reducing the start and stop time of the product.

[0040] In a specific embodiment of the present invention, the conductive sheet 60 is a copper sheet. Specifically, the conductive sheet 60 generates eddy currents in a changing magnetic field to cut the magnetic induction lines, generating a force that hinders the movement of the vibrator assembly 20, and provides 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.

[0041] Two side surfaces of the vibrator assembly 20 perpendicular to the second direction are both planes.

[0042] In a specific embodiment of the present invention, the vibrator assembly 20 further includes a mass block 24, in which a through hole 25 extending in the second direction and a crossbeam 26 arranged in the through hole 25 are arranged; 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 both sides of the crossbeam 26 along the second direction, and the two second magnets 22 are arranged on both sides of the crossbeam 26 along the first direction. The mass block 24 is used to improve the counterweight of the vibrator assembly 20, thereby improving the vibration feedback effect of the linear vibration motor 100, and is used to install the first magnet 21, the second magnet 22 and the third magnet 23.

[0043] Specifically, the mass block 24 is a rectangular parallelepiped structure, wherein the middle portion thereof has a through hole 25 with a rectangular cross section arranged along the second direction, and the middle portion of the through hole 25 is provided with a cross beam 26 with a rectangular cross section arranged along the third direction, and the two ends of the cross beam 26 extend to the two side walls of the through hole 25. The cross beam 26 and the first magnet 21 have the same width along the first direction, so that the first magnet 21 can be fixed through the two side surfaces in the second direction; the two side surfaces of the cross beam 26 along the first direction are each connected to a second magnet 22, and the third magnet 23 is arranged in the space formed by the second magnet 22 and the through hole 25.

[0044] To strengthen the connection, the first magnet 21 , the second magnet 22 and the third magnet 23 are also connected and fixed to the inner wall of the through hole 25 through other side walls.

[0045] In a specific embodiment of the utility model, it also includes a plurality of elastic support members 30, which are arranged at both ends of the vibrator assembly 20 in the first direction, and one end of each elastic support member 30 is connected to the shell 10, and the other end is connected to the mass block 24.

[0046] Specifically, there are two elastic support members 30, which are respectively arranged at both ends of the vibrator assembly 20 and are used to connect with 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 a displacement in the first direction to achieve vibration feedback.

[0047] In a specific embodiment of the present invention, the elastic support member 30 is a spring sheet, which includes 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 to the mass block 24, and the second connecting part is used to connect to the shell 10.

[0048] Specifically, the vibration part can be formed into a straight line, Z shape, V shape, U shape or S shape. In this embodiment, the vibration part is formed into a V shape, and the first connecting part and the second connecting part are respectively arranged at the opening ends of the V-shaped structure.

[0049] In a specific embodiment of the present invention, a first stopper 41 is provided on the side of the first connection portion away from the mass block 24, and a second stopper 42 is provided on both sides of the second connection portion. By providing the first stopper 41 and the second stopper 42, the connection strength between the elastic support member 30 and the housing 10 and the mass block 24 can be strengthened, thereby improving the structural strength of the linear vibration motor 100.

[0050] In a specific embodiment of the present invention, protrusions 28 are provided at both ends of the mass block 24 along the first direction. Specifically, the end surface of the protrusion 28 away from the mass block 24 is a plane adapted to the housing 10 at a corresponding position, so that under the extreme amplitude, the vibrator assembly 20 can abut against the housing 10 through the protrusion 28, thereby reducing the damage to the elastic support member 30 and ensuring the reliability of the linear vibration motor 100.

[0051] In a specific implementation of the present invention, two side surfaces of the mass block 24 perpendicular to the second direction are formed with avoidance grooves 27. Specifically, the avoidance grooves 27 are used to avoid the metal sheet and the stator assembly 50.

[0052] In a specific embodiment of the present invention, the stator assembly 50 also includes an FPCB52 electrically connected to the coil 51, wherein the coil is annular and fixed to the side of the shell 10 perpendicular to the second direction, and the width of the coil along the first direction is equal to or slightly smaller than the width of the through hole 25 along the first direction.

[0053] The housing 10 includes an upper shell 11 with an opening and a lower shell 12 adapted to be connected to the opening of the upper shell 11 . The upper shell 11 and the lower shell 12 are adapted to form a receiving cavity for receiving the vibrator assembly 20 , the stator assembly 50 and the conductive sheet 60 .

[0054] In a specific embodiment of the present invention, the housing 10 is a magnetically conductive housing, so that the magnetic circuit formed by the vibrator assembly 20 can be closed, thereby reducing magnetic leakage and further improving the utilization efficiency of the magnetic field in the vibrator assembly 20 .

[0055] The second aspect of the present invention further provides an electronic device, comprising any one of the above-mentioned linear vibration motors 100. Specifically, the electronic device in this embodiment can be a mobile phone, a tablet, a computer, and a smart wearable device such as a smart watch, VA, VR, etc.

[0056] The structure of the linear vibration motor 100 refers to the above embodiment. Since the electronic device of this embodiment has all the technical features of the above linear vibration motor 100, it also has at least all the beneficial effects of the above linear vibration motor 100.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A linear vibration motor, characterized in that: It comprises a shell, a stator assembly, a vibrator assembly and a conductive sheet contained in the shell, wherein the vibrator assembly vibrates along a first direction; wherein, The vibrator assembly comprises a first magnet, a second magnet and a third magnet, each of which is two in number. 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 are 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 are 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 are parallel to the first direction; The stator assembly includes a coil. The coil and the conductive sheet are disposed on both sides of the vibrator assembly along the second direction and fixed to the shell. Two driving edges of the coil are 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 vibrator assembly also includes a mass block, which is provided with a through hole extending in the second direction and a beam mounted in the through hole; the first magnet, the second magnet and the third magnet are all arranged in the through hole, and the two first magnets are arranged on both sides of the beam along the second direction, and the two second magnets are arranged on both sides of the beam along the first direction.

4. The linear vibration motor according to claim 3, characterized in that: It also includes a plurality of elastic support members, which are arranged at both ends of the vibrator assembly in a first direction, and one end of each of the elastic support members is connected to the shell, 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 member is a spring sheet, which includes 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 to connect to the mass block, and the second connecting portion is used to connect to the shell.

6. The linear vibration motor according to claim 5, characterized in that: A first stopper is arranged on a side of the first connection portion facing away from the mass block, and second stops are arranged on both sides of the second connection portion.

7. The linear vibration motor according to claim 3, characterized in that: The mass block is provided with protrusions at two ends along the first direction.

8. The linear vibration motor according to claim 3, characterized in that: Avoidance grooves are formed on two side surfaces of the mass block that are perpendicular to the second direction.

9. The linear vibration motor according to claim 1, characterized in that: The shell is a magnetic conductive shell.

10. An electronic device, characterized in that: A linear vibration motor comprising any one of claims 1-9.

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