CN110690794A

CN110690794A - Vertical linear vibration motor

Info

Publication number: CN110690794A
Application number: CN201911009957.1A
Authority: CN
Inventors: 林岳崇
Original assignee: Leading Technology (dongtai) Co Ltd
Current assignee: Leading Technology (dongtai) Co Ltd
Priority date: 2019-10-23
Filing date: 2019-10-23
Publication date: 2020-01-14

Abstract

The utility model provides a vertical linear vibrating motor, including the casing, be provided with the active cell subassembly in the casing and with the corresponding complex stator module of active cell subassembly, stator module includes the coil and is used for the FPC board that coil and external circuit are connected, be provided with on the FPC board with the first groove of dodging of the lead wire matched with of coil and with active cell subassembly matched with buffer layer, the first inslot of dodging is provided with the first connecting portion with the lead connection of coil. This openly can prevent that active cell subassembly from bumping the lead wire of pressing FPC board and coil, even pressing the lead wire of disconnected coil, reduced the noise to guarantee the vibration frequency and the vibration effect of product, simple structure, compactness, stability have improved the vibration space of product, stability, poor reliability and processing procedure yield, and the product of being convenient for carries out the volume production.

Description

Vertical linear vibration motor

Technical Field

The present disclosure relates to linear motors, and more particularly to a vertical linear vibration motor.

Background

With the rapid development of electronic products, especially mobile terminal devices such as mobile phones and tablet computers, these electronic devices basically use a vibration generating device for preventing noise from the electronic device from interfering with others. The traditional vibration generating device adopts a rotor motor based on eccentric rotation, and realizes mechanical vibration through the rotation of an eccentric vibrator, because the eccentric vibrator generates mechanical friction, electric sparks and the like in the rotating process, a commutator and an electric brush can influence the rotating speed of the eccentric vibrator, and further the vibration effect of the device is influenced, therefore, the vibration generating device adopts a linear motor with better performance.

Linear motors, also called linear vibration motors, linear motors, push rod motors, etc., the most commonly used types of linear motors are flat plate type, U-shaped slot type, and tube type, which are technologies for converting electric energy into linear motion mechanical energy, and suspend a moving element by the repulsive force of magnets, and directly drive the moving element by magnetic force, without transmission via a transmission mechanism such as a gear train, as in a rotary motor, so that the linear motor can make the moving element driven by the linear motor perform high acceleration and deceleration reciprocating motions. In addition, with the rapid development and strong competition of industries such as semiconductor, electronic, photoelectric, medical equipment and automation control, the requirement for linear motion performance of motors in various fields is increasing, and the motors are expected to have high speed, low noise and high positioning accuracy, so that linear motors are used in many applications to replace mechanical motion methods such as conventional servo motors.

However, some existing linear vibration motors have certain defects in design, so that problems that a mover assembly collides and presses a lead of an FPC board and a coil, and even breaks the lead of the coil, and the like occur in a vibration process, and certain noise may be generated, so that a vibration effect and a vibration frequency of the motor are affected, stability and reliability of the motor are poor, a process yield is low, mass production is difficult, and the like, and application and development of the linear vibration motor are affected.

Disclosure of Invention

The present disclosure is directed to the above-mentioned problems of the conventional linear vibration motor, and provides a vertical linear vibration motor.

In order to solve at least one of the above technical problems, the present disclosure proposes the following technical solutions:

the utility model provides a vertical linear vibrating motor, includes the casing, is provided with the active cell subassembly in the casing and reaches the stator module with the corresponding complex of active cell subassembly, and stator module includes the coil and is used for the FPC board that coil and external circuit are connected, is provided with on the FPC board and dodges the groove and with active cell subassembly matched with buffer layer with the lead wire matched with of coil is first, first dodge the inslot be provided with the first connecting portion of the pin connection of coil.

The beneficial effects of this disclosure are: after the external circuit made the coil circular telegram through the FPC board, coil and runner subassembly interact, thereby make the runner subassembly carry out the vibration of vertical direction for stator module, in the vibration process, the lead wire of coil is arranged in the first cell body on the FPC board, can prevent that the runner subassembly from bumping and pressing or pressing the lead wire of disconnected coil, the buffer layer can provide cushioning effect to the vibration of runner subassembly, prevent that the runner subassembly from bumping and pressing the lead wire of FPC board and coil, even press the lead wire of disconnected coil, the noise has been reduced, thereby guarantee the vibration frequency and the vibration effect of product, moreover, the steam generator is simple in structure, the compactness, and stability, the vibration space of product has been improved, stability, poor reliability and processing procedure yield, be convenient for the product to carry out the volume production, the application and the development of.

In some embodiments, the chassis includes an upper chassis and a lower chassis, and the lower chassis is provided with a second groove for accommodating the FPC board.

In some embodiments, the bottom surface of the second groove body is provided with a positioning through hole.

In some embodiments, the mover assembly is elastically coupled to the upper case and/or the lower case by a spring, respectively.

In some embodiments, the mover assembly includes a mass connected to the spring, and one end of the mass near the stator assembly is provided with a permanent magnet correspondingly matched with the coil.

In some embodiments, one end of the mass close to the coil is provided with a yoke cooperating with the permanent magnet.

In some embodiments, one end of the permanent magnet near the coil is provided with a pole piece.

In some embodiments, the buffer layer is provided with a first through hole matched with the coil and a first notch correspondingly matched with the first avoiding groove, and the first through hole is communicated with the first notch.

In some embodiments, a first groove body which is matched with the coil and corresponds to the first through hole is arranged on the FPC board, and the first groove body is communicated with the first avoiding groove.

In some embodiments, the bottom surface of the first tank is provided with a second through hole corresponding to the coil.

In addition, in the technical solutions of the present disclosure, the technical solutions can be implemented by adopting conventional means in the art, unless otherwise specified.

Drawings

In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is an exploded view of a vertical linear vibration motor according to an embodiment of the present disclosure.

Fig. 2 is a perspective view of a vertical linear vibration motor according to an embodiment of the present disclosure.

Fig. 3 is a sectional view of a vertical linear vibration motor according to an embodiment of the present disclosure.

Fig. 4 is a perspective view of an upper housing provided in an embodiment of the present disclosure.

Fig. 5 is a perspective view of a lower housing provided in an embodiment of the present disclosure.

Fig. 6 is a perspective view of an FPC board provided by an embodiment of the present disclosure.

The numbers in the figures indicate that the casing 1, the upper casing 11, the inserting portion 111, the pressing surface 112, the eighth slot 113, the lower casing 12, the first flange edge 121, the third slot 122, the second slot 123, the positioning through hole 124, the fifth slot 125, the second notch 126, the support portion 127, the mover assembly 2, the permanent magnet 21, the mass block 22, the first hole 221, the seventh slot 222, the yoke 23, the sixth slot 231, the second flange edge 232, the pole piece 24, the stator assembly 3, the coil 31, the FPC board 32, the buffer layer 321, the first through hole 3211, the first notch 3212, the first avoiding slot 301, the first connecting portion 302, the first slot 303, the second through hole 304, the extending portion 305, the second connecting portion 306, the spring 4, and the fourth slot 41.

Detailed Description

In order to make the objects, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of some, but not all, embodiments of the disclosure and are not to be considered as limiting the disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

In the description of the present disclosure, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "both ends", "both sides", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present disclosure and simplifying the description, but do not indicate or imply that the elements referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present disclosure. Furthermore, the terms "first," "second," "upper," "lower," "primary," "secondary," and the like are used for descriptive purposes only and may be used for purposes of simplicity in more clearly distinguishing between various components and not to indicate or imply relative importance.

In the description of the present disclosure, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present disclosure can be understood in specific instances by those of ordinary skill in the art.

Fig. 1 is an exploded view of a vertical linear vibration motor according to an embodiment of the present disclosure, fig. 2 is a perspective view of a vertical linear vibration motor according to an embodiment of the present disclosure, fig. 3 is a cross-sectional view of a vertical linear vibration motor according to an embodiment of the present disclosure, fig. 4 is a perspective view of an upper chassis according to an embodiment of the present disclosure, fig. 5 is a perspective view of a lower chassis according to an embodiment of the present disclosure, and fig. 6 is a perspective view of an FPC board according to an embodiment of the present disclosure.

Example (b):

as shown in fig. 1 to 6, a vertical linear vibration motor includes a casing 1, a mover assembly 2 and a stator assembly 3 correspondingly engaged with the mover assembly 2 are disposed in the casing 1, the mover assembly 2 is generally located above the stator assembly 3, the casing 1 includes an upper casing 11 and an upper casing 12, the stator assembly 3 is disposed on the upper casing 12, and the upper casing 11 and the upper casing 12 are generally welded together. The stator assembly 3 includes a coil 31 and an FPC board 32 for connecting the coil 31 to an external circuit, the FPC board 32 is provided with a first avoiding groove 301 matched with a lead of the coil 31 and a buffer layer 321 matched with the mover assembly 2, the first avoiding groove 301 is provided with a first connecting portion 302 connected with the lead of the coil 31, and the mover assembly 2 generally has a permanent magnet 21 correspondingly matched with the coil 31. Generally, the FPC board 32 includes an upper layer, a middle layer and a lower layer, the upper layer is a protective film made of an insulating material, the lower layer is a base material made of an insulating material, the middle layer is a circuit layer made of copper foil, the buffer layer 321 is adhered to the protective film of the upper layer, the first avoiding groove 301 is located on the protective film of the upper layer, the first connecting portion 302 as a part of the circuit layer is located in the first avoiding groove 301, the coil 31 is generally adhered to the FPC board 32, the first connecting portion 302 is generally welded to the lead wire of the coil 31, the lower layer of the FPC board 32 is generally adhered to the upper chassis 12, the thickness of the lower layer is generally greater than that of the upper layer, so that the lower layer not only has a function of protecting the middle layer, but also has the function of reinforcement, so that the overall structural strength of the FPC board 32 is improved, and the buffer layer 321 can be made of materials with good buffer performance, such as polyimide foam boards, rubber, polyurethane, foam, silica gel, acrylic rubber and the like.

The FPC board 32 is a Flexible Printed Circuit board (Flexible Printed Circuit), which is a highly reliable and excellent Flexible Printed Circuit board made of a polyimide or polyester film as a base material, and has the characteristics of high wiring density, light weight, thin thickness, and good bendability; the permanent magnet 21 is a magnet capable of retaining high remanence for a long time in an open circuit state, and is also called a hard magnet, such as a magnetic steel, a neodymium magnet, a permanent magnet made of a ferrite permanent magnet material, and the like, preferably the magnetic steel, the magnetic steel has the characteristics of high hardness, high coercive force value, high temperature resistance, strong corrosion resistance, and the like, has good permanent magnet characteristics, and can retain strong and stable magnetism for a long time after an external magnetic field is removed after being magnetized in a saturated state.

In the using process, the coil 31 is in the magnetic field generated by the permanent magnet 21 of the mover assembly 2, after the coil 31 is energized by an external circuit through the FPC board 32, the coil 31 is subjected to a certain ampere force, the coil 31 interacts with the permanent magnet 21 of the mover assembly 2, and the permanent magnet 21 moves relative to the coil 31 under a corresponding reaction force because the coil 31 is fixed, so that the coil 31 also cuts the magnetic induction lines, so that the mover assembly 2 vibrates vertically relative to the stator assembly 3, namely, the product vibrates. This is disclosed at the vibration in-process, the lead wire of coil 31 is arranged in the first cell body 303 on FPC board 32, can prevent that runner assembly 2 from bumping or pressing off the lead wire of coil 31, buffer layer 321 can provide cushioning effect to runner assembly 2's vibration, prevent runner assembly 2 from bumping and pressing FPC board 32 and coil 31's lead wire, even press off coil 31's lead wire, the noise has been reduced, thereby guarantee the vibration frequency and the vibration effect of product, moreover, the steam generator is simple in structure, it is compact, and stable, the vibration space of product has been improved, and is stable, poor in reliability and processing procedure yield, be convenient for the product to carry out the volume production, the application and the development of product have been enlarged.

The FPC board 32 is provided on the upper housing 12, and in order to more conveniently and stably mount the FPC board 32, the upper housing 12 is provided with a second groove 123 for mounting the FPC board 32, and the FPC board 32 is usually adhesively fixed on the bottom surface of the second groove 123. In the assembly process of the product, the upper casing 12 needs to be positioned at a certain fixture firstly, then other parts are assembled, the bottom surface of the second groove body 123 is further provided with a positioning through hole 124, the positioning through hole 124 is generally coaxial with the coil 31 and has a diameter smaller than that of the inner hole of the coil 31, the FPC board 32 is generally provided with an avoiding through hole corresponding to the inner hole of the coil 31, so that the positioning of the upper casing 12 and the assembly of related parts are facilitated, the operation is simple and convenient, the precision is higher, the stability is better, and the process yield of the product is improved. The bottom surface of the second slot 123 may further be provided with a plurality of fifth slots 125 matching with the FPC board 32, and the plurality of fifth slots 125 are usually interlaced to form a mesh, so that the FPC board 32 can be more firmly adhered to the upper housing 12 after the glue is applied.

The mover assembly 2 is elastically connected with the upper casing 11 and/or the upper casing 12 through the spring 4, that is, the spring 4 suspends the mover assembly 2 in the casing 1, generally, the spring 4 is located between the mass block 22 and the upper casing 12, the lower end of the upper casing 11, the outer edge of the spring 4 and the upper end of the upper casing 12 are sequentially abutted and connected, and in the vibration process of the mover assembly 2, the spring 4 not only has the function of buffering protection, but also can provide a certain restoring force for the vibration of the mover assembly 2. The spring 4 can be a conical spring, a tower-shaped spring, a planar spring or other suitable elastic pieces, the planar spring generally refers to a spring piece which is vertically and elastically deformed in a plane, for example, an elastic material is formed by rolling on the plane, hollowed out on the planar elastic material or formed by punching and shearing the elastic material, and the like, the planar spring has a more compact structure, and the volume of a product can be reduced.

The upper casing 12 is formed with a first flange 121 which is matched with the spring 4 and the upper casing 11, and the upper casing 11 and/or the spring 4 is pressed against and connected to the first flange 121, so that the operation is more convenient, and the structure is more stable and firm.

The first flange edge 121 is provided with a plurality of third grooves 122, the third grooves 122 are generally located on the outer side edge of the first flange edge 121 and are uniformly distributed along the circumferential direction of the first flange edge 121, according to specific situations, one, two or more third grooves 122 are provided, the spring 4 is provided with a fourth groove 41 correspondingly matched with the third groove 122, the fourth groove 41 is generally located on the outer side edge of the spring 4, and the upper casing 11 is provided with an inserting portion 111 corresponding to the third groove 122 and the fourth groove 41. When assembling, the inserting portion 111 is inserted into the third slot 122 and the fourth slot 41, so that the connection between the upper housing 11, the spring 4 and the upper housing 12 is tighter, and the structure is more compact, more stable and more reliable. Further, the thickness of the inserting portion 111 is smaller than that of the upper housing 11, so that an abutting surface 112 is formed at the intersection of the inserting portion 111 and the upper housing 11, and the upper housing 11 can be better matched with the spring 4 or the first flange edge 121 through the abutting surface 112, so that the stability is better.

The rotor assembly 2 comprises a mass block 22 connected with the spring 4, the mass block 22 is also called a balance block, a vibrating block, a balance weight block and the like, in the vibrating process, the mass block 22 can improve the vibrating force and the vibrating effect of the rotor assembly 2 through self inertia, so that the rotor assembly 2 can vibrate more stably and reliably, one end, close to the stator assembly 3, of the mass block 22 is provided with a permanent magnet 21 correspondingly matched with the coil 31, the permanent magnet 21 is usually located above the coil 31, and the permanent magnet 21 and the mass block 22 can be connected in a gluing or welding mode. In use, the coil 31 is in a magnetic field generated by the permanent magnet 21, after the coil 31 is energized by an external circuit through the FPC board 32, the coil 31 is subjected to a certain ampere force, the coil 31 and the permanent magnet 21 interact, and the permanent magnet 21 moves relative to the coil 31 under a corresponding reaction force because the coil 31 is fixed, so that the coil 31 also cuts the magnetic induction lines, so that the moving component 2 vibrates in a vertical direction relative to the stator component 3, namely, the product vibrates. In addition, the frequency and the amplitude of the vibration of the rotor assembly 2 can be changed by adjusting the current waveform of the coil 31, so that different vibration senses can be generated, the vibration senses are rich, multiple different tactile feedbacks are realized, the power source for the tactile feedback of the intelligent equipment is convenient to apply, and the application range of the product is improved.

One end of the mass block 22 close to the coil 31 is provided with a magnetic yoke 23 matched with the permanent magnet 21, the mass block 22 is also provided with a first hole body 221 for arranging the magnetic yoke 23, the magnetic yoke 23 is provided with a sixth groove body 231 for arranging the permanent magnet 21, the notch of the sixth groove body faces the coil 31, the magnetic yoke 23 is arranged in the first hole body 221, the permanent magnet 21 is arranged in the sixth groove body 231, the connection is tighter and firmer, the structure is more compact and more stable, the magnetic yoke 23 usually refers to a soft magnetic material which does not produce a magnetic field (a magnetic induction line) and only performs magnetic induction line transmission in a magnetic circuit, the magnetic yoke 23 usually can be made of soft iron, A steel, soft magnetic alloy, ferrite material, stainless steel or silicon steel and the like with higher magnetic permeability, the magnetic yoke is uniformly and symmetrically arranged on the periphery of the induction coil, the magnetic leakage of the induction coil is restrained from diffusing outwards, the induction adding efficiency is improved, and, i.e., the efficiency of energy utilization.

The notch of the sixth groove 231 is further provided with a second flange 232, and one end of the first hole 221 is provided with a seventh groove 222 matched with the second flange 232, so that the connection is tighter, the structure is more compact, and the connection is more stable and reliable. In addition, the spring 4 can be connected to the mass 22 and the second flange 232, respectively, so that the connection is more compact and secure.

The pole piece 24 is arranged at one end of the permanent magnet 21 close to the coil 31, the pole piece 24 can be generally glued or welded on the permanent magnet 21, the pole piece 24 is generally made of a soft magnetic material which does not produce a magnetic field and only plays a role in magnetic induction line transmission in a magnetic circuit, the pole piece 24 can restrict the magnetic field generated by the permanent magnet 21 to a certain extent, so that the magnetic induction lines can better act on the coil 31, the induction adding efficiency is improved, the utilization efficiency of the magnetic induction lines, namely the utilization efficiency of energy, and further the interaction force of the permanent magnet 21 and the coil 31, namely the vibration force of a product is improved.

The diameter of the sixth slot 231 is greater than the outer diameter of the coil 31, the diameter of the permanent magnet 21 is less than the inner diameter of the coil 31, the diameter of the pole piece 24 is equal to or slightly less than the diameter of the permanent magnet 21, the upper end of the coil 31 can be positioned in the sixth slot 231, the lower ends of the pole piece 24 and the permanent magnet 21 can be positioned in the inner hole of the coil 31, the coil 31 and the permanent magnet 21 are coaxial, the pole piece 24 and the permanent magnet 21 axially move along the coil 31, and therefore the pole piece assembly 2 vibrates along the vertical direction, the utilization efficiency of the magnetic induction lines is higher, the utilization efficiency of energy is improved, the vibration effect is better, the structure is more compact and stable, and the size of a product is. In addition, coil 31 can also be nested with the iron core etc. in, coil 31 and iron core adopt sticky fastening usually, the iron core is hollow cylindricality usually, the iron core is made by materials such as stainless steel, silicon steel that magnetic conductivity is good usually, the iron core not only can improve coil 31's structural stability and coil 31 and relevant spare part be connected's reliability, be convenient for production, assembly etc., and iron core and terminal surface can be with around magnetic induction line better conduct on coil 31, thereby can increase the magnetic conductivity of whole magnetic circuit, improve the magnetic induction intensity that coil 31 received, the magnetic field that permanent magnet 21 produced can better act on coil 31, thereby improve permanent magnet 21 and coil 31 interact power, the vibrational force of product promptly.

The buffer layer 321 is provided with a first through hole 3211 matched with the coil 31 and a first notch 3212 correspondingly matched with the first avoiding groove 301, the first through hole 3211 is communicated with the first notch 3212, the coil 31 is conveniently connected with the FPC board 32 through the first through hole 3211 and the first notch 3212, and a lead of the coil 31 is conveniently connected with the first connecting portion 302 in the first avoiding groove 301. Still be provided with on the FPC board 32 and cooperate and with the corresponding first cell body 303 of first through-hole 3211 with coil 31, first cell body 303 with first groove 301 intercommunication of dodging, first cell body 303 passes the upper strata and the lower floor of FPC board 32 usually, first cell body 303 and first through-hole 3211's size are greater than coil 31's external diameter, the coil 31 of being convenient for more like this and FPC board 32 adhesive bonding, connect more firmly, and are more stable, reliable. The bottom surface of the first groove 303 is further provided with a second through hole 304 corresponding to the coil 31, the second through hole 304 is arranged on the lower layer of the FPC board 32, and the diameter of the second through hole 304 is smaller than the outer diameter of the coil 31 and larger than the inner diameter of the coil 31, so that the coil 31 is conveniently connected with the FPC board 32 and the upper housing 12 in an adhesive manner. The inner sides of the first groove body 303 and the second through hole 304 can be further provided with a plurality of groove bodies, so that the coil 31, the FPC board 32 and the upper shell 12 are more conveniently in adhesive connection with the FPC board 32, the coil 31 is prevented from falling off, and each layer of adhesive connection of the FPC board 32 is also convenient.

The FPC board 32 generally has a protruding portion 305 protruding out of the housing 1 to facilitate connection with an external circuit, a second connecting portion 306 connected with the external circuit is disposed on the protruding portion 305, a second notch 126 for the protruding portion 305 to pass through and a supporting portion 127 matched with the protruding portion 305 are disposed on the upper housing 12, an eighth slot 113 for the supporting portion 127 and the protruding portion 305 to pass through is disposed on the upper housing 11, and the eighth slot 113 is generally located on one of the inserting portions 111, so that the FPC board 32 is connected with the external circuit conveniently, and the structure is more compact and stable.

The foregoing is directed to embodiments of the present disclosure, which are provided for illustration only and not for limitation, and it is understood that modifications and substitutions may be made by those skilled in the art without departing from the spirit of the disclosure and all such modifications and substitutions are to be considered within the scope of the appended claims. In this case all the details may be replaced with equivalent elements, and the materials, shapes and dimensions may be any.

Claims

1. The utility model provides a vertical linear vibration motor, its characterized in that, includes casing (1), be provided with in casing (1) active cell subassembly (2) and with the corresponding complex stator module (3) of active cell subassembly (2), stator module (3) include coil (31) and are used for coil (31) and external circuit connection's FPC board (32), be provided with on FPC board (32) with coil (31) lead wire matched with first dodge groove (301) and with active cell subassembly (2) matched with buffer layer (321), first dodge be provided with in groove (301) with the first connecting portion (302) of the pin connection of coil (31).

2. A vertical linear vibration motor according to claim 1, wherein said casing (1) comprises an upper casing (11) and a lower casing (12), said lower casing (12) being provided with a second slot (123) for receiving said FPC board (32).

3. A vertical linear vibration motor according to claim 2, wherein the bottom surface of the second groove body (123) is provided with a positioning through hole (124).

4. A vertical linear vibration motor according to claim 2, wherein said mover assembly (2) is elastically coupled to said upper casing (11) and/or said lower casing (12) by means of springs (4), respectively.

5. A vertical linear vibration motor according to claim 4, characterized in that the mover assembly (2) comprises a mass (22) connected to the spring (4), and one end of the mass (22) near the stator assembly (3) is provided with a permanent magnet (21) correspondingly fitted to the coil (31).

6. A vertical linear vibration motor according to claim 5, wherein an end of the mass (22) near the coil (31) is provided with a yoke (23) which is fitted with the permanent magnet (21).

7. A vertical linear vibration motor according to claim 5, characterized in that the permanent magnet (21) is provided with a pole piece (24) near one end of the coil (31).

8. The vertical linear vibration motor according to any one of claims 1 to 7, wherein the buffer layer (321) is provided with a first through hole (3211) corresponding to the coil (31) and a first notch (3212) corresponding to the first avoiding groove (301), and the first through hole (3211) is communicated with the first notch (3212).

9. The vertical linear vibration motor according to claim 8, wherein a first groove (303) is disposed on the FPC board (32) and is matched with the coil (31) and corresponds to the first through hole (3211), and the first groove (303) is communicated with the first avoiding groove (301).

10. A vertical linear vibration motor according to claim 9, wherein the bottom surface of the first groove (303) is provided with a second through hole (304) corresponding to the coil (31).