CN106655699B

CN106655699B - A kind of linear vibration motor

Info

Publication number: CN106655699B
Application number: CN201611087748.5A
Authority: CN
Inventors: 秦小森; 祖峰磊
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2016-11-30
Filing date: 2016-11-30
Publication date: 2018-11-02
Anticipated expiration: 2036-11-30
Also published as: CN106655699A

Abstract

The invention discloses a kind of linear vibration motors, include the driving device of shell and receiving in the shell, driving device includes coil and magnet assemblies；There is shell magnetic-conductance portion, the plane where coil to be parallel to direction of vibration, and magnetic-conductance portion sets up separately with coil in the both sides of magnet assemblies；Magnet assemblies have two pieces of radial magnets magnet parallel with two pieces, two pieces of radial magnets are opposite on direction of vibration, the magnetizing direction of two pieces of radial magnets is opposite, and it is each perpendicular to the plane where coil, the magnetizing direction of two blocks of parallel magnet is opposite, and each parallel to direction of vibration, one of parallel magnet forms the first Halbach array in coil side and two pieces of radial magnets, another block of parallel magnet forms the second Halbach array in magnetic-conductance portion side and two pieces of radial magnets, and coil is made to be located at the high-intensity magnetic field side of the first Halbach array, and magnetic-conductance portion is made to be located at the high-intensity magnetic field side of the second Halbach array.

Description

A kind of linear vibration motor

Technical field

The present invention relates to motor technologies fields, more particularly it relates to a kind of linear vibration motor.

Background technology

With the development of the communication technology, portable electronic device, such as mobile phone, tablet computer, multimedia entertainment equipment etc. Have become people's lives requirement.In these electronic equipments, system is done usually using miniature linear vibration motor Feedback, such as incoming call prompt of mobile phone vibrational feedback etc..

Linear vibration motor generally includes oscillator and stator, and oscillator further comprises mass block, magnet assemblies and shrapnel etc., Stator further comprises FPCB, coil etc., wherein coil and FPCB are fixedly connected on the shell of linear vibration motor, quality Block and magnet assemblies are fixed together, and shrapnel is connected between mass block and shell, and coil is then located at magnet assemblies and generates Magnetic field range in.In this way, after coil energization, coil is subject to an ampere force effect, since coil is fixedly connected on shell On, therefore, oscillator will carry out reciprocal regular vibration under the driving of the reaction force of Ampere force, and due to the matter of mass block It measures larger, and then the effect that entire linear vibration motor vibrates can be obtained.

It can be seen that the reaction force of above-mentioned Ampere force is unique power of drive vibrator vibration, but it is limited to coil Spatial volume, coil turn and effective length are limited, and the Ampere force is usually smaller, this is when existing motor being caused to there is response Between longer major reason therefore be highly desirable to provide a kind of motor configuration for the driving force that can increase and be supplied to oscillator.

Invention content

One purpose of the embodiment of the present invention is to provide a kind of new technical solution of linear vibration motor, can with increase It is supplied to the driving force of oscillator.

According to the first aspect of the invention, a kind of linear vibration motor is provided comprising shell and be housed in described outer Driving device in shell, the driving device include coil and magnet assemblies；The shell has magnetic-conductance portion, the coil place Plane be parallel to direction of vibration, the magnetic-conductance portion sets up separately with the coil in the both sides of the magnet assemblies；

The magnet assemblies have two pieces of radial magnets magnet parallel with two pieces, and two pieces of radial magnets are in the vibration Opposite on direction, the magnetizing direction of two pieces of radial magnets is opposite and the plane that is each perpendicular to where the coil, wherein one Block radial magnet corresponds to the first edge (21) of the coil, and another piece of radial magnet corresponds to the second edge of the coil, institute The magnetizing direction of two blocks of parallel magnet is stated on the contrary and each parallel to the direction of vibration, one of parallel magnet is in the line Enclose side and two pieces of radial magnets and form the first Halbach array, another block of parallel magnet the magnetic-conductance portion side with Two pieces of radial magnets form the second Halbach array, and the coil is made to be located at first Halbach array High-intensity magnetic field side and the magnetic-conductance portion is made to be located at the high-intensity magnetic field side of second Halbach array.

Optionally, the volume of the parallel magnet of first Halbach array is more than or equal to second Haier The volume of the parallel magnet of Bake array.

Optionally, first edge and second edge are each perpendicular to the direction of vibration.

Optionally, two pieces of radial magnets about the coil perpendicular to the middle section pair of the direction of vibration Claim.

Optionally, the driving device further includes iron core, and the iron core forms electromagnet, the iron core with the coil It include the part in the centre bore of the coil.

Optionally, the shell also has another magnetic-conductance portion, and another magnetic-conductance portion and the coil are located at described the The same side of one Halbach array.

Optionally, the shell includes the upper casing and lower casing to link together, and the lower casing is located at institute with the coil State the same side of the first Halbach array；The upper casing is integrally made of permeability magnetic material, the upper casing be parallel to it is described under The top of shell is the magnetic-conductance portion.

Optionally, the shell includes the upper casing and lower casing to link together, and the lower casing is located at institute with the coil State the same side of the first Halbach array；The upper casing includes the upper casing ontology of non-magnet material and as the magnetic-conductance portion Shielding piece, the shielding piece is arranged on the upper casing ontology.

Optionally, the linear vibration motor includes more than two driving devices, and more than two drivings Device is arranged in order on the direction of vibration.

Optionally, two neighboring driving device shares one piece of radial magnet.

The beneficial effects of the present invention are the driving device of linear vibration motor of the present invention is formd again using four blocks of magnet Mould assembly Halbach array, that is, include with the first Halbach array of coil phase separation and with the magnetic-conductance portion phase separation of shell Second Halbach array, since Halbach array can generate unilateral high-intensity magnetic field in side with magnet as few as possible, Therefore, when coil to be arranged to the high-intensity magnetic field side in the first Halbach array, the drive for being supplied to oscillator can just be significantly increased Power.But also due to the effect of the high-intensity magnetic field, the electricity such as coil, magnetic device may be to magnet assemblies and then to entire oscillator Apply downward suction, therefore, effect of the present invention further through the high-intensity magnetic field of the second Halbach array to magnetic-conductance portion so that lead Magnetic portion generates magnet assemblies upward suction, this just can be realized by this kind of structure upward suction and downward suction it Between balance, solve the single Halbach array of setting and may interfere with asking for movement locus of the oscillator on direction of vibration Topic, ensures that the resonant frequency of actual resonant frequency and design is almost the same, while the also bullet of effective protection linear vibration motor Piece is injury-free.

By referring to the drawings to the detailed description of exemplary embodiment of the present invention, other feature of the invention and its Advantage will become apparent.

Description of the drawings

It is combined in the description and the attached drawing of a part for constitution instruction shows the embodiment of the present invention, and even With its explanation together principle for explaining the present invention.

Fig. 1 is the structural schematic diagram according to a kind of embodiment of linear vibration motor of the present invention；

Fig. 2 is the structural schematic diagram of driving device in Fig. 1；

Fig. 3 is the structural schematic diagram according to another embodiment of linear vibration motor of the present invention

Fig. 4 is the decomposition texture schematic diagram based on a kind of embodiment of the linear vibration motor of driving device in Fig. 2.

Reference sign：

1- shell 11- upper casings；

12- lower casings；2- coils；

4- magnet assemblies；41a, 41b- radial magnet；

The parallel magnet of 42a, 42b-；3- iron cores；

6- mass blocks；7-V type shrapnels；

8-FPCB；9- limited blocks；

10- blocks；121- magnetic-conductance portions.

The gaps S-；111- magnetic-conductance portions.

Specific implementation mode

Carry out the various exemplary embodiments of detailed description of the present invention now with reference to attached drawing.It should be noted that：Unless in addition having Body illustrates that the unlimited system of component and the positioned opposite of step, numerical expression and the numerical value otherwise illustrated in these embodiments is originally The range of invention.

It is illustrative to the description only actually of at least one exemplary embodiment below, is never used as to the present invention And its application or any restrictions that use.

Technology, method and apparatus known to person of ordinary skill in the relevant may be not discussed in detail, but suitable In the case of, the technology, method and apparatus should be considered as part of specification.

In shown here and discussion all examples, any occurrence should be construed as merely illustrative, without It is as limitation.Therefore, other examples of exemplary embodiment can have different values.

It should be noted that：Similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi It is defined, then it need not be further discussed in subsequent attached drawing in a attached drawing.

Fig. 1 is mainly shown in figure according to a kind of simplified structure diagram of embodiment of linear vibration motor of the present invention The driving device part of linear vibration motor, and arrow direction is the magnetizing direction of corresponding magnet in figure.Fig. 2 is driven in Fig. 1 The structural schematic diagram of dynamic device part.

According to Fig. 1, which includes shell 1 and the mass block 6 that is housed in shell 1 and driving Device, the driving device include magnet assemblies 4 and coil 2.

For the ease of carrying out the assembling of linear vibration motor, which may include upper casing 11 and lower casing 12, and the two fastens And it links together.

Coil 2 is fixed with respect to lower casing 12, this can be that coil 2 is fixedly bonded on lower casing 12, can also be by coil 2 It is fixedly bonded on lower casing 12 by insulating paper etc..

Plane where coil 2 is parallel to direction of vibration, and therefore, the centerline direction of coil 2 will be perpendicular to direction of vibration, In the embodiment shown in fig. 1, direction of vibration is left and right directions, and the centerline direction of coil 2 is upper and lower directions.

There is coil 2 first edge 21 and the second edge 22, two edge 21,22 can be each perpendicular to direction of vibration, with Increase the effective length of coil 2 and 4 phase separation of magnet assemblies, is perpendicular to the direction of paper in the embodiment shown in fig. 1.

First edge 21 and the second edge 22 can be straight flange, or arc-shaped edges should be perpendicular to for arc-shaped edges Direction of vibration is construed as the arc-shaped edges with the tangent line perpendicular to direction of vibration.

In order in the case of same magnetic field intensity, improve the reaction force of above-mentioned Ampere force, coil 2 can be rectangular Shape, here, the needs based on coiling, which can be arc-shaped in four corners.And make above-mentioned first edge 21 and second Edge 22 is two long legs of coil 2, and then increases the effective length of coil 2.

The 4 relative mass block 6 of magnet assemblies is fixed, and with the part as oscillator, can be applied to improve coil 2 The driving force of oscillator, above-mentioned magnet assemblies 4 form Halbach (Halbach) array, which is by radial direction Magnet and the combined array of parallel magnet array, wherein the radial magnet of Halbach array is that magnetizing direction is vertical In the magnet of the plane where coil 2, the parallel magnet of Halbach array is the magnet that magnetizing direction is parallel to direction of vibration.

Specifically, as depicted in figs. 1 and 2, which includes two pieces of radial magnets 41a, 41b and parallel magnet 42a, this two pieces of radial magnets 41a, 41b are opposite on direction of vibration, this parallel magnet 42a be folded in two pieces of radial magnet 41a, Between 41b, the magnetizing direction of radial magnet 41a is from bottom to up that the lower end of i.e. radial magnet 41a is the poles S, upper end is the poles N, and The magnetizing direction of radial magnet 41b is from top to bottom that the lower end of i.e. radial magnet 41b is the poles N, upper end is the poles S, parallel magnet The magnetizing direction of 42a is from left pointing right that is, left end is the poles S, right end is the poles N, to pass through two pieces of radial magnet 41a, 41b peace Row magnet 42a forms the first Halbach array, and coil 2 is made to be located at the high-intensity magnetic field side of the first Halbach array.

In a further embodiment, the magnetizing direction that can also be radial magnet 41a is and radial magnet from top to bottom The magnetizing direction of 41b is from bottom to up that and the magnetizing direction of parallel magnet 42a also should be reversed, is become from right a directions left side, with guarantor Card generates high-intensity magnetic field in 2 side of coil.

Above-mentioned radial magnet 41a corresponds to the first edge 21, and radial magnet 41b corresponds to the second edge 22, in this way, with Fig. 1 and For magnetizing direction shown in Fig. 2, the magnetic line of force that radial magnet 41b is sent out can be enable vertical to have at least partly The direction of component passes through the second edge 22, and enables the magnetic line of force for returning to radial magnet 41a perpendicular to have at least partly The direction of straight component passes through the first edge 21, and then generates the driving force along direction of vibration.

Further, the first edge 21 can also be made to be aligned with radial magnet 41a, and make the second edge 22 and radial magnetic Iron 41b alignment, wherein alignment is set to be the first edge 21 and is located at radial magnet 41a on direction of vibration where coil 2 Plane on projection coverage area in, the second edge 22 is located on direction of vibration radial magnet 41b where coil 2 In the coverage area of projection in plane.In this way, equally by taking magnetizing direction shown in FIG. 1 as an example, it can make radial magnet 41b The magnetic line of force sent out largely can pass through the second edge 22 with generally vertical direction, and to return to radial magnet 41a's The magnetic line of force largely can pass through the first edge 21 with generally vertical direction, and then realize efficiently using for driving device.

Moreover, it is also possible to further be two pieces of radial magnets 41a, 41b installation position about coil 2 perpendicular to vibration The middle section in direction is symmetrical, to improve the stress of oscillator and the harmony of stress, wherein the center of coil 2 is passed through in the middle section Line.

In this way, according to Fig. 1, the current direction in coil 2 be so that the first edge 21 electric current out of outer direction, And when so that the electric current of the second edge 22 is outside interior direction, coil 2 will apply the reaction of Ampere force to the left to magnet assemblies 4 Power.And when reversed shown in opposite Fig. 1 of electric current in coil 2, the reaction force of Ampere force will become to the right, and then drive vibrator It vibrates repeatedly.

Since Halbach array can generate unilateral magnetic field, strongest magnetic is generated in side to lead to too small amount of magnet , therefore, in the case where the high-intensity magnetic field side in the first Halbach array is arranged in coil 2, coil 2 will be effectively improved The magnetic field intensity at place, and then improve the driving force vibrated repeatedly for drive vibrator.

But also due to the effect for the high-intensity magnetic field that the first Halbach array generates, what coil 2, lower casing 12 were arranged leads The device that the shielding piece etc. being arranged in magnetic portion, lower casing 12 can generate the effect of power with the first Halbach array may be to entire Oscillator applies downward suction, which will interfere movement locus of the oscillator on direction of vibration so that design Resonant frequency deviates with respect to actual conditions, while larger damage is also caused to the shrapnel of linear vibration motor.

Therefore, in the present invention, as depicted in figs. 1 and 2, which further includes another parallel magnet 42b, this is flat Between row magnet 42b is equally folded in two pieces of radial magnets 41a, 41b in the top of parallel magnet 42a, with two blocks of radial magnetic Iron 41a, 41b form the second Halbach array.

The magnetizing direction of the parallel magnet 42b is with the magnetizing direction of parallel magnet 42a on the contrary, in the second Halbach battle array Row top generates high-intensity magnetic field.

At the same time, which is provided with magnetic-conductance portion 111, which sets up separately with coil 2 in magnet assemblies 4 Both sides so that magnetic-conductance portion 111 is located at the high-intensity magnetic field side of the second Halbach array, and then pass through magnetic-conductance portion 111 and the second sea You apply magnet assemblies 4 upward suction at Bake array phase separation, and to balance above-mentioned downward suction, this just can increase The movement locus of above-mentioned interference oscillator is solved the problems, such as while large driving force.

In the embodiment shown in fig. 1, the upper casing 11 is whole is made of permeability magnetic material, therefore, under being parallel to of upper casing 11 The top of shell 12 may act as the magnetic-conductance portion 111.

In a further embodiment, the upper casing 11 can also include two parts, that is, include non-magnet material upper casing ontology, And the shielding piece being arranged on upper casing ontology, the shielding piece set up separately as magnetic-conductance portion 111 and coil 2 in the both sides of magnet assemblies 4, Wherein, which can be arranged on the inner wall and/or outer wall of upper casing ontology.

In order to further increase driving force by limited space, in the embodiment shown in fig. 1, the first Halbach battle array The volume of the parallel magnet 42a of row is more than the volume of the parallel magnet 42b of the second Halbach array, so that 4 energy of magnet assemblies It is enough to generate stronger magnetic field in 2 side of coil.Here, can be by area to magnetic-conductance portion 111 and/or in 2 side energy of coil Enough components for generating downward suction in turn with the first Halbach array phase separation are adjusted, to reach the suction so that upward The purpose of power and downward suction equalization.

Between the magnet assemblies 4 and magnetic-conductance portion 111 should there are gap S, the vibration to ensure oscillator is unaffected.

In order to which the magnetic line of force to the magnetic field space where coil 2 is restrained, to further strengthen the magnetic field intensity of the side, In this embodiment, lower casing 12 includes lower casing ontology (non-magnet material) and the shielding piece being arranged on the outer wall of lower casing ontology As magnetic-conductance portion 121, which is arranged with coil 2 in the same side of the first Halbach array.

Since linear vibration motor of the present invention is provided with magnetic-conductance portion 111 and the second Halbach array, which leads The shielding piece in magnetic portion 121 can also be arranged on the inner wall of lower casing ontology, as long as by configuring the upward suction so as to oscillator Power reaches balance with downward suction.

In the other embodiment of the present invention, which can also integrally be made of permeability magnetic material, in this way, lower casing 12 Entirety can be used as the use of magnetic-conductance portion 121.

Fig. 3 is basically illustrated in figure according to the structural schematic diagram of another embodiment of linear vibration motor of the present invention The driving device part of linear vibration motor, and arrow direction is the magnetizing direction of corresponding magnet in figure.

According to Fig.3, the main distinction of the embodiment and embodiment illustrated in fig. 1 is that driving device further includes iron core 3, which also fixes with respect to lower casing 12, and forms electromagnet with coil 2, to generate magnetic field when coil 2 obtains electric, so that it is right First Halbach array generates magneticaction.

In having the embodiment of magnetic-conductance portion 121 in conjunction with lower casing 12, which can contact or consolidate with magnetic-conductance portion 121 Fixed connection.

The magnetic line of force can be restrained by the way that magnetic-conductance portion 121 is arranged so that the magnetic field intensity of 2 side of coil is added By force.

And so that iron core 3 is contacted with magnetic-conductance portion 121, will reduce magnetic resistance.

The iron core 3 may include the part in the centre bore of coil 2, to improve the active force of electromagnet.

Further, which can also include the part backwards to 4 side of magnet assemblies for being located at coil 2, so that Iron core 3 is in inverted T shaped.In this embodiment, coil 2 can be directly fixedly connected on the part of iron core.

Further, the iron core 3 in addition in the centre bore of coil 2 part and positioned at coil 2 backwards to magnetic circuit system It unites except the part of 4 sides, further includes the side of sidewall portion of wound coil 2 on the outside, is i.e. one storage tank of the iron core 3 formation, and line Circle 2 can be then embedded in the storage tank 34.

In this way, according to Fig.3, the current direction in coil 2 be so that the first edge 21 electric current out of outer direction, And when so that the electric current of the second edge 22 is outside interior direction, electromagnet will apply magnetic force (repulsion) to the left to radial magnet 41a, And also applying magnetic force (gravitation) to the left to radial magnet 41b, the two direction is identical, and according to left hand rule, and coil 2 is applied to The direction of the reaction force of the Ampere force of first Halbach array is also consistent with the direction of the magnetic force.

When electric current in coil 2 is reversed with respect to shown in Fig. 3, the reaction force of magnetic force and Ampere force also will be reversed, i.e., It is directed to right side, and then the driving force vibrated repeatedly is provided to oscillator.

From the above description, it can be seen that for linear vibration motor of the present invention, the driving force that drive vibrator is vibrated repeatedly will wait In the sum of the reaction force of Ampere force and total magnetic force, therefore, according to the technique and scheme of the present invention, will further increase to shaking The driving force that son provides.

In this embodiment, iron core 3, which is applied to the downward suction of the first Halbach array, can equally pass through magnetic conduction The upward suction that portion 111 applies the second Halbach array is balanced, and therefore, according to the technique and scheme of the present invention will Enough while realizing increase driving force and ensureing the interference-free purpose of the movement locus of oscillator.

Linear vibration motor of the present invention may include an above-mentioned driving device, can also include in a further embodiment More than two (including two) driving devices, more than two driving devices are arranged in order on direction of vibration, this is in bulk It will be further increased and be capable of providing to the driving force of oscillator in the case of permission.

Further, for the embodiment of the more than two driving devices of setting, the Halbach of two neighboring driving device Array can share one piece of radial magnet, accordingly, two adjacent edge of two neighboring coil 2, i.e., the of one coil 2 First edge 21 of two edge 22 and adjacent windings 2, will be aligned with same radial magnet.This coil in each driving device Wiring make the current direction of respective coil meet the same time to oscillator apply the same direction driving force can be obtained to drive The effect that power is overlapped.

The oscillator of linear vibration motor, including magnet assemblies 4, mass block 6 and two V-type shrapnels 7, magnetic are shown in Fig. 4 4 relative mass block 6 of iron component is fixed, and two V-type shrapnels 7 set up separately on direction of vibration in the both sides of mass block 6, and opening direction On the contrary, wherein a free end of each V-type shrapnel 7 is fixedly connected with mass block 6, another free end is fixed with upper casing 11 Connection.

Two V-type shrapnels 7 are disposed in opposite direction conducive to the stationarity of oscillator vibration is improved, reduce resonance.

The stator of linear vibration motor, including coil 2, flexible PCB 8 (FPCB), the flexible electrical are also shown in Fig. 4 Road plate 8 exposes lead and/or pad via lower casing 12.

Other parts of linear vibration motor, including limited block 9, block 10 etc. are also shown in Fig. 4.

The various embodiments described above primary focus describes difference from other examples, but those skilled in the art should be clear Chu, the various embodiments described above can be used alone or be combined with each other as needed.

Various embodiments of the present invention are described above, above description is exemplary, and non-exclusive, and It is not limited to disclosed each embodiment.Without departing from the scope and spirit of illustrated each embodiment, for this skill Many modifications and changes will be apparent from for the those of ordinary skill in art field.The selection of term used herein, purport In the principle, practical application or technological improvement to the technology in market for best explaining each embodiment, or this technology is made to lead Other those of ordinary skill in domain can understand each embodiment disclosed herein.The scope of the present invention is limited by appended claims It is fixed.

Claims

1. a kind of linear vibration motor, which is characterized in that including shell (1) and the driving device being housed in the shell (1), The driving device includes coil (2) and magnet assemblies (4)；The shell (1) has magnetic-conductance portion (111), coil (2) institute Plane be parallel to direction of vibration, the magnetic-conductance portion (111) is set up separately with the coil (2) the two of the magnet assemblies (4) Side；

The magnet assemblies (4) have two pieces of radial magnets (41a, 41b) magnet (42a, 42b) parallel with two pieces, described two pieces Radial magnet (41a, 41b) is opposite on the direction of vibration, the magnetizing direction phase of two pieces of radial magnets (41a, 41b) Instead and the plane that is each perpendicular to where the coil (2), the first of the corresponding coil (2) of one of radial magnet (41a) Edge (21), the second edge (22) of the corresponding coil (2) of another piece of radial magnet (41b), two blocks of parallel magnet The magnetizing direction of (42a, 42b) is opposite and each parallel to the direction of vibration, and one of parallel magnet (42a) is in the line It encloses (2) side and forms the first Halbach array, another piece of parallel magnet (42b) with two pieces of radial magnets (41a, 41b) The second Halbach array is formed in the magnetic-conductance portion (111) side and two pieces of radial magnets (41a, 41b), and makes institute Coil (2) is stated to be located at the high-intensity magnetic field side of first Halbach array and the magnetic-conductance portion (111) is made to be located at described the The high-intensity magnetic field side of two Halbach arrays.

2. linear vibration motor according to claim 1, which is characterized in that the parallel magnetic of first Halbach array The volume of iron (42a) is more than or equal to the volume of the parallel magnet (42b) of second Halbach array.

3. linear vibration motor according to claim 1, which is characterized in that first edge (21) and second side Portion (22) is each perpendicular to the direction of vibration.

4. linear vibration motor according to claim 3, which is characterized in that two pieces of radial magnets (41a, 41b) are closed It is symmetrical perpendicular to the middle section of the direction of vibration in the coil (2).

5. linear vibration motor according to claim 1, which is characterized in that the driving device further includes iron core (3), institute It states iron core (3) and forms electromagnet with the coil (2), the iron core (3) includes the portion in the centre bore of the coil (2) Point.

6. linear vibration motor according to claim 1, which is characterized in that the shell (1) also has another magnetic-conductance portion (121), another magnetic-conductance portion (121) is located at the same side of first Halbach array with the coil (2).

7. linear vibration motor according to claim 1, which is characterized in that the shell (1) includes linking together Upper casing (11) and lower casing (12), the lower casing (12) are located at the same side of first Halbach array with the coil (2)； The upper casing (11) is integrally made of permeability magnetic material, and the top for being parallel to the lower casing (12) of the upper casing (11) is described leads Magnetic portion (111).

8. linear vibration motor according to claim 1, which is characterized in that the shell (1) includes linking together Upper casing (11) and lower casing (12), the lower casing (12) are located at the same side of first Halbach array with the coil (2)； The upper casing (11) includes the upper casing ontology of non-magnet material and the shielding piece as the magnetic-conductance portion (111), the shielding piece It is arranged on the upper casing ontology.

9. linear vibration motor according to any one of claim 1 to 8, which is characterized in that the linear vibration motor Including more than two driving devices, and more than two driving devices are arranged in order on the direction of vibration.

10. linear vibration motor according to claim 9, which is characterized in that two neighboring driving device shares one piece of diameter To magnet.