Linear vibration motor and electric equipment

Abstract

The linear vibration motor comprises an outer frame, a driving part and a driven part, the driving part is connected to the outer frame, the driven part is connected to the driving part, the driving part comprises a moving frame, a permanent magnet moving shaft and a first elastic piece, one end of the first elastic piece is connected to the outer frame, and the other end of the first elastic piece is connected to the moving frame. The permanent magnet moving shaft is positioned on the moving frame, the driven part comprises a coil assembly and a second elastic piece, the coil assembly is annularly arranged on the peripheral side of the permanent magnet moving shaft, one end of the second elastic piece is connected with the coil assembly, and the other end is connected with the moving frame. The permanent magnet moving shaft is arranged to drive the moving frame to move synchronously, and the moving frame is elastically connected with the coil assembly, so that when the moving direction of the moving frame and the elastic acting force of the second elastic piece are located in the same direction, the moving force output by the moving frame outwards is enhanced; when the magnetic suspension motor is applied to an electric shaver and an electric hair cutter, the shearing force output by the motor is enhanced, and compared with an elastic piece type magnetic suspension motor, the magnetic suspension motor has higher shearing force.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of micro linear motor especially relates to a linear vibration motor and electric equipment. BACKGROUND

[0002] Micro linear motor is often used in hair clipper, shaver and other electric equipment, and the linear reciprocating motion of the linear motor is used to realize the shearing effect. The shearing force output by the linear motor is one of the important indicators of the above-mentioned shearing electric equipment, which directly affects the use effect of the equipment. The magnetic suspension linear motor applied to hair clipper, shaver and other equipment is a common linear motor, which supports the output shaft through the elastic sheet at both ends, and the output shaft makes linear reciprocating motion. The shearing force output by this structure is small. SUMMARY

[0003] The utility model provides a linear vibration motor and electric equipment, aims at solving the problem of small shearing force output by the existing linear vibration motor.

[0004] According to the embodiment of the present application, a linear vibration motor is provided, which comprises an outer frame, a driving part and a driven part, the driving part is connected to the outer frame, and the driven part is connected to the driving part; the driving part comprises a moving frame, a permanent magnet moving shaft and a first elastic member, one end of the first elastic member is connected to the outer frame, and the other end is connected to the moving frame, and the permanent magnet moving shaft is positioned on the moving frame; the driven part comprises a coil assembly and a second elastic member, the coil assembly is annularly arranged on the outer circumferential side of the permanent magnet moving shaft, one end of the second elastic member is connected to the coil assembly, and the other end is connected to the moving frame.

[0005] Preferably, the first elastic member and the second elastic member are bent U-shaped or V-shaped elastic steel wires; the moving frame comprises a hanging ear plate and a connecting plate which are fixedly connected or integrally formed, two hanging ear plates are arranged at both ends of the moving direction of the connecting plate, one end of the hanging ear plate close to the connecting plate is hung on the first elastic member, and the other end of the hanging ear plate is tightly connected with the permanent magnet moving shaft; one end of the second elastic member is connected to the connecting plate, and the other end is buckled on the coil assembly.

[0006] Preferably, the moving frame is arranged close to the bottom direction of the outer frame, and there is a space between the moving frame and the outer frame; the opening directions of the first elastic member and the second elastic member are opposite, the first elastic member suspends the moving frame in the outer frame, and the second elastic member supports the coil assembly on the moving frame.

[0007] Preferably, the first elastic member adopts a bent V-shaped elastic steel wire; the first elastic member comprises a first bending portion and a first opening portion, and the opening size of the first elastic member gradually decreases from the first bending portion to the first opening portion; the first bending portion is sleeved on one end of the hanging ear plate close to the bottom of the outer frame, and the first opening portion is hung on the outer frame.

[0008] Preferably, the second elastic member adopts a bent V-shaped elastic steel wire; the second elastic member comprises a second bending portion and a second opening portion, and the opening size of the second elastic member gradually increases from the second bending portion to the second opening portion; the second bending portion is sleeved and positioned at both ends of the coil assembly in the moving direction, and the second opening portion is connected to the outer frame.

[0009] Preferably, the driving portion further comprises a support frame and an output shaft, one end of the support frame is connected to the connecting plate, the other end of the support frame passes through the outer frame and positions the output shaft.

[0010] Preferably, the coil assembly comprises a steel wire fixing block, a magnetic conducting ring, a wire frame and a coil, the steel wire fixing block is arranged at both ends of the wire frame, the magnetic conducting ring is sleeved on the outer circumferential side of the wire frame, and the coil is wound on the wire frame; a through hole is formed in the middle of the magnetic conducting ring, and the through hole is an elliptical hole.

[0011] Preferably, the permanent magnet moving shaft comprises a shaft body and a magnetic ring, and the magnetic ring is sleeved on the outer circumferential side of the shaft body; the magnetic ring is always located in the area of the coil assembly when the shaft body moves.

[0012] Preferably, the first elastic member and the second elastic member adopt elastic steel wires in a columnar structure.

[0013] The utility model also provides a kind of electric equipment, including any one of the linear vibration motor described above.

[0014] Compared with prior art, the linear vibration motor and electric equipment provided by the utility model have the following beneficial effects:

[0015] 1. By setting permanent magnet moving shaft to drive synchronous movement of moving frame, moving frame is elastically connected with coil assembly, so that moving frame moves while moving, and coil assembly moves with moving frame, when the moving direction of moving frame and the elastic force of second elastic member are located in the same direction, the moving force outputted by moving frame is strengthened, such as applied to electric shaver, electric clipper, the shear force of motor output is enhanced, compared with traditional elastic sheet type magnetic levitation motor, has higher shear force.

[0016] 2、By setting the first elastic member and the second elastic member to adopt a bent U-shaped or V-shaped elastic steel wire, the first elastic member at both ends suspends the moving frame in the outer frame, and cooperates with the second elastic member to support the coil assembly above the moving frame, so that when the moving frame moves outward to output linear movement, the coil assembly can be driven to form a superimposed effect of resonance, increasing the output force outward, that is, the moving force of the moving frame is used to drive the coil assembly to move, without the need for additional driving equipment.

[0017] 3、By suspending the moving frame in the outer frame through the first elastic member, and supporting the coil assembly above the moving frame through the second elastic member, the driving part forms a U-shaped "cradle type" structure, and the coil assembly of the driven part is located in the U-shaped "cradle type" structure formed by the driving part, so as to fully utilize the internal space of the motor and effectively reduce the size of the motor. Especially in the field of miniature linear motors, it can be adapted to various handheld electric devices, reduce the occupied space of the motor, and improve the battery storage space of the device.

[0018] 4、The first elastic member is set to a V-shaped structure, the opening size of the first elastic member gradually decreases from the first bending part to the first opening part, and the first opening part is hung in the outer frame. The ear plate located in the first bending part is clamped and pre-tightened, so that the first elastic member can not only suspend the moving frame in the outer frame, but also clamp and pre-tighten the moving frame based on the opening size, and at the same time, the elastic recovery force of the moving frame is considered.

[0019] 5、The second elastic member is set to a V-shaped structure, the opening size of the second elastic member gradually increases from the second bending part to the second opening part, the second bending part is sleeved and positioned at both ends of the coil assembly in the moving direction, and the second opening part is connected to the outer frame. The end of the coil assembly is clamped and pre-tightened by the second bending part. That is, the second elastic member can not only support the coil assembly above the moving frame, but also clamp and pre-tighten both ends of the coil assembly based on the opening size, and at the same time, the elastic recovery force of the coil assembly is considered.

[0020] 6、By adopting an elastic steel wire with a columnar structure for the first elastic member and the second elastic member, the first elastic member and the second elastic member formed by the columnar structure can withstand multi-directional stress. For example, compared with a sheet-shaped elastic piece, it is less likely to deform and damage in the radial direction. In this embodiment, the first elastic member formed by the columnar structure can stably suspend the moving frame, and the second elastic member formed by the columnar structure can stably support the coil assembly. At the same time, compared with the sheet-shaped elastic piece outputting reciprocating linear motion, the first elastic member and the second elastic member with a columnar structure have smaller vibration and lower noise during operation, which can effectively reduce the noise and vibration of the motor during operation. Especially for handheld electric devices, it can reduce the vibration and noise of the device when the user holds it, and improve the user experience. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0022] Figure 1 is a structural schematic diagram of a linear vibration motor provided by the first embodiment of the present application.

[0023] Figure 2 is a structural schematic diagram of a driving part in the linear vibration motor provided by the first embodiment of the present application.

[0024] Figure 3 is a structural schematic diagram of a driven part in the linear vibration motor provided by the first embodiment of the present application.

[0025] Figure 4 is an exploded structural schematic diagram of a coil assembly in the linear vibration motor provided by the first embodiment of the present application.

[0026] Figure 5 is a structural schematic diagram of a first elastic member in the linear vibration motor provided by the first embodiment of the present application.

[0027] Figure 6 is a structural schematic diagram of a second elastic member in the linear vibration motor provided by the first embodiment of the present application.

[0028] Figure 7 is a structural schematic diagram of an outer frame in the linear vibration motor provided by the first embodiment of the present application.

[0029] Label explanation:

[0030] 1, outer frame; 11, top plate; 12, side plate; 13, bottom plate; 14, wire plate; 15, flexible wire;

[0031] 2, driving part; 21, moving frame; 211, hanging ear plate; 212, connecting plate; 22, permanent magnet moving shaft; 221, shaft body; 222, magnetic ring; 23, first elastic member; 231, first bending part; 232, first opening part; 24, support frame; 25, output shaft;

[0032] 3, driven part; 31, coil assembly; 311, steel wire fixing block; 312, magnetic conducting ring; 3121, through hole; 313, wire holder; 314, coil;

[0033] 32, second elastic member; 321, second bending part; 322, second opening part;

[0034] 100, groove. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0036] It should also be understood that the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and the appended claims of the present application, the singular forms "a", "an" and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0037] It should be further understood that the term "and / or" used in the specification and the appended claims of the present application means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0038] Please refer to Figure 1 , Figure 2 and Figure 3 , the first embodiment of the present application discloses a linear vibration motor, comprising an outer frame 1, a driving part 2 and a driven part 3, the driving part 2 is connected to the outer frame 1, and the driven part 3 is connected to the driving part 2.

[0039] The driving part 2 comprises a moving frame 21, a permanent magnet moving shaft 22 and a first elastic member 23, one end of the first elastic member 23 is connected to the outer frame 1, the other end is connected to the moving frame 21, the permanent magnet moving shaft 22 is positioned on the moving frame 21, and the permanent magnet moving shaft 22 drives the moving frame 21 to move synchronously along the axial direction of the permanent magnet moving shaft 22.

[0040] The driven part 3 comprises a coil assembly 31 and a second elastic member 32, the coil assembly 31 is annularly arranged on the outer circumferential side of the permanent magnet moving shaft 22, one end of the second elastic member 32 is connected to the coil assembly 31, and the other end is connected to the moving frame 21.

[0041] It can be understood that the spacing between the coil assembly 31 and the permanent magnet moving shaft 22 is provided, and the coil assembly 31 and the permanent magnet moving shaft 22 have a spacing. The coil assembly 31 is a solenoid structure based on a coil, the coil assembly 31 is energized to form an alternating magnetic field to drive the permanent magnet moving shaft 22 in the coil assembly 31 to reciprocate in the axial direction, and then the moving frame 21 and the permanent magnet moving shaft 22 are synchronously moved. The coil assembly 31 is driven by the moving frame 21, and the coil assembly 31 also moves with the permanent magnet moving shaft 22 based on the second elastic member 32.

[0042] It can be understood that since the permanent magnet moving shaft 22 and the moving frame 21 are rigidly connected, the moving frame 21 and the coil assembly 31 are elastically connected through the second elastic member 32, so that the permanent magnet moving shaft 22 and the moving frame 21 are synchronously moved, and the reciprocating movement frequency between the coil assembly 31 and the moving frame 21 is different. Under high-frequency vibration, when the elastic restoring force of the second elastic member 32 acting on the moving frame 21 driven by the coil assembly 31 is the same as the moving direction of the permanent magnet moving shaft 22, the shear force outputted outward by the permanent magnet moving shaft 22 is superimposed with the force of the second elastic member, that is, the shear force outputted outward by the linear vibration motor of the present application is improved.

[0043] Please continue to combine Figure 2 and Figure 3 , the first elastic member 23 and the second elastic member 32 are bent U-shaped or V-shaped elastic steel wires, for example, commonly used stainless steel, spring steel or beryllium copper and other bendable elastic metal materials, and then the two ends of the bent first elastic member 23 and the second elastic member 32 are divided into a bending region and an opening region.

[0044] The moving frame 21 includes a hanging ear plate 211 and a connecting plate 212 which are fixedly connected or integrally formed. Two hanging ear plates 211 are arranged at two ends of the moving direction of the connecting plate 212, one end of the hanging ear plate 211 close to the bottom of the outer frame 1 is hung on the first elastic member 23, and the other end of the hanging ear plate 211 is tightly connected with the permanent magnet moving shaft 22. One end of the second elastic member 32 is connected to the connecting plate 212, and the other end is buckled to the coil assembly 31.

[0045] Specifically, combined with Figure 2 and Figure 4 , in this embodiment, the first elastic member 23 is a bent V-shaped elastic steel wire, the first elastic member 23 includes a first bending part 231 and a first opening part 232, the first bending part 231 is a closed structure and can be used for hanging, and the first opening part 232 is an open structure. Correspondingly, the second elastic member 32 is also a bent V-shaped elastic steel wire, and the second elastic member 32 includes a second bending part 321 and a second opening part 322.

[0046] It can be understood that the elastic steel wire of the V-shaped structure is that the opening size changes continuously from the opening area to the bending area. In the embodiment, the opening size of the first elastic member 23 gradually decreases from the first bending portion 231 to the first opening portion 232. The first bending portion 231 is sleeved at the bottom of the hanging ear plate 211 near one end of the connecting plate 212, and the first opening portion 232 is hung on the outer frame 1. Therefore, the hanging ear plate 211 located in the first bending portion 231 is clamped and pre-tightened. Conversely, the opening size of the second elastic member 32 gradually increases from the second bending portion 321 to the second opening portion 322. The second bending portion 321 is sleeved at both ends of the coil assembly 31 in the moving direction, and the second opening portion 322 is connected to the outer frame. Therefore, the end portion of the coil assembly 31 is clamped and pre-tightened by the second bending portion 321.

[0047] As shown in Figure 3 the first opening portion 232 and the second opening portion 322 respectively face opposite directions, and the first bending portion 231 is arranged near the bottom of the outer frame 1. Therefore, the moving frame 21 is suspended in the outer frame 1 by the first elastic member 23 at both ends, and the coil assembly 31 is supported on the moving frame 21 by the second elastic member 32. When the coil assembly 31 forms a magnetic field after being energized, the permanent magnet moving shaft 22 is forced to move along the axial direction actively, and the moving frame 21 moves synchronously. Therefore, the coil assembly 31 moves along with the moving frame 21 (or the permanent magnet moving shaft 22) under the driving of the second elastic member 32.

[0048] Alternatively, in other embodiments, the first elastic member 23 and the second elastic member 32 can also adopt a U-shaped bending structure. Therefore, a groove for pre-tightening the steel wire can be arranged at the end portion of the hanging ear plate 211 and the coil assembly 31. The pre-tightening effect of the bending area can also be achieved, or a protrusion can be arranged at the corresponding pre-tightening position of the elastic member to form a limiting effect. For example, a protruding rib is arranged at the lower edge position near the end portion of the coil assembly 31 of the second elastic member 32 to resist the coil assembly 31. As long as the first elastic member 23 can suspend the moving frame 21 and the second elastic member 32 can support the coil assembly 31 on the moving frame 21, the limitation is not made herein.

[0049] Alternatively, as another embodiment, the first elastic member 23 and the second elastic member 32 can adopt a straight steel wire, that is, an elastic steel wire without bending. The two ends are fixed on an object by welding or clamping. For example, when the first elastic member 23 adopts a straight steel wire, the two ends are welded on the outer frame 1 and the hanging ear plate 211, or clamped by a clamping screw screwed into a pre-tightening hole on the outer edge of the outer frame 1 and the hanging ear plate 211 to clamp the steel wire in the hole.

[0050] Optionally, in some particular embodiments, the first elastic member 23 and the second elastic member 32 can also adopt a sheet-shaped structure of an elastic sheet, which can be arranged as a non-bent V-shaped or U-shaped elastic sheet, or arranged as the above-mentioned strip-shaped elastic sheet with both ends fixed, as long as the deformation surface direction of the elastic sheet is arranged in the axial movement direction of the permanent magnet moving shaft 22.

[0051] Please combine Figure 1 and Figure 7 , the outer frame 1 includes a top plate 11, a side plate 12 and a bottom plate 13 connected in sequence, the side plate 12 and the bottom plate 13 are integrally connected, the top plate 11 and the bottom plate 13 can be used to connect and fix external devices, the side plate 12 is a baffle structure arranged in the moving direction of the moving frame 21, and then the outer frame 1 forms an open structure in the shape of a mouthful of characters, which is beneficial to heat dissipation of the motor. In other embodiments, the outer frame 1 can also be arranged as a closed structure according to different adaptive devices, which will not be described here.

[0052] It can be understood that the side surface of the bottom plate 13 is provided with a wire plate 14, and a soft package wire 15 is connected to the wire plate 14, and the soft package wire 15 is electrically connected with the coil assembly 31.

[0053] Please continue to combine Figure 1 and Figure 2 , the driving part 2 further includes a support frame 24 and an output shaft 25, one end of the support frame 24 is connected to the connecting plate 212, the other end penetrates through the outer frame 1 and positions the output shaft 25, and the output shaft 25 is used to connect external objects, such as the head of a shaver, to drive the head to move linearly.

[0054] It can be understood that the top of the outer frame 1 is the side close to the direction of the output shaft 25, that is, the side close to the top plate 11. The bottom of the outer frame 1 is the end of the outer frame 1 away from the direction of the output shaft 25, that is, the side close to the bottom plate 13.

[0055] The moving frame 21 is arranged close to the bottom direction of the outer frame 1, and there is a gap between the moving frame 21 and the outer frame 1, the height from the outer frame 1 to the hanging ear plate 211 of the first elastic member 23 is greater than the length of the hanging ear plate 211, and the length of the first elastic member 23 is greater than the length of the second elastic member 32, so that the driving part 2 forms a suspended cradle structure, and at the same time, the driven part 3 is formed on the driving part 2, based on the resonance effect of the driven part 3, the shear force outputted by the driving part 2 is improved.

[0056] Please combine Figure 3 and Figure 4The coil assembly 31 comprises a steel wire fixing block 311, a magnetic conducting coil 312, a wire holder 313 and a coil 314. The steel wire fixing block 311 is arranged at both ends of the wire holder 313. The magnetic conducting coil 312 is arranged on the outer circumferential side of the wire holder 313. The coil 314 is arranged on the wire holder 313. The magnetic conducting coil 312 is provided with an elliptical hole 3121.

[0057] It can be understood that the steel wire fixing block 311 is provided with a groove 100 for buckling the second bending part 321. The wire holder 313 is used for sleeving the coil 314. When the permanent magnet moving shaft 22 moves axially, it will also have a slight offset in the vertical direction. Therefore, the elliptical hole 3121 of the magnetic conducting coil 312 can provide a space in the vertical direction to avoid collision.

[0058] Please continue to refer to Figure 2 The permanent magnet moving shaft 22 comprises a shaft body 221 and a magnetic ring 222. The magnetic ring 222 is arranged on the outer circumferential side of the shaft body 221. The magnetic ring 222 is always in the area of the coil assembly 31 when the shaft body 221 moves.

[0059] It can be understood that the permanent magnet moving shaft 22 can also adopt a structure of a whole permanent magnet. In this embodiment, the magnetic ring 222 is sleeved on the shaft body 221. The number of the magnetic ring 222 can be one or more to form a multi-pole structure. When the magnetic ring 222 is one, the single magnetic ring is arranged as NSN or SNS magnetic poles. When the magnetic ring 222 is more than one, the magnetic poles of adjacent magnetic rings 222 are different. For example, when the number of the magnetic ring 222 is three, the magnetic ring 222 is arranged as NSN or SNS magnetic poles or a single magnetic ring is arranged as NSN or SNS magnetic poles.

[0060] Please continue to combine Figure 1 , Figure 5 and Figure 6In the embodiment, the first elastic member 23 and the second elastic member 32 are U-shaped or V-shaped elastic steel wires, and the first elastic member 23 and the second elastic member 32 are columnar elastic steel wires, so that the first elastic member 23 and the second elastic member 32 formed in the columnar structure can bear stress in multiple directions, and are less likely to be deformed and damaged in the radial direction compared with the sheet-shaped elastic piece, and in the embodiment, the first elastic member 23 formed in the columnar structure can stably suspend the moving frame 21, and the second elastic member 32 formed in the columnar structure can stably support the coil assembly 31. Meanwhile, compared with the sheet-shaped elastic piece outputting reciprocating linear motion, the first elastic member 23 and the second elastic member 32 formed in the columnar structure have smaller vibration and lower noise during operation, can effectively reduce the noise and vibration of the motor during operation, especially for handheld electric devices, can reduce the vibration and noise of the device held by the user, and improve the user experience.

[0061] The second embodiment of the utility model provides a kind of electric equipment, which adopts the linear vibration motor provided in the first embodiment, and the electric equipment includes common electric shaver, electric clipper and other handheld electric devices, and in the embodiment, when the electric equipment is electric clipper, the output shaft 25 of linear vibration motor can output reciprocating linear motion by connecting movable cutter head.

[0062] Compared with the prior art, the linear vibration motor and the electric equipment provided by the utility model have the following beneficial effects:

[0063] 1. The permanent magnet moving shaft drives the moving frame to move synchronously, and the moving frame is elastically connected with the coil assembly, so that the moving frame moves while the coil assembly moves with the moving frame. When the moving direction of the moving frame and the elastic force of the second elastic member are in the same direction, the moving force outputted by the moving frame is strengthened. For example, when applied to electric shaver and electric clipper, the shear force outputted by the motor is strengthened, and the shear force is higher than that of the traditional elastic piece type magnetic suspension motor.

[0064] 2. The first elastic member and the second elastic member are U-shaped or V-shaped elastic steel wires, the first elastic member at both ends suspends the moving frame in the outer frame, and the second elastic member supports the coil assembly above the moving frame, so that when the moving frame moves to output linear motion, the coil assembly can be driven to form resonance superposition effect, and the output force is increased. That is, the moving force of the moving frame is used to drive the coil assembly to move, without additional driving equipment.

[0065] 3. The moving frame is suspended inside the outer frame by the first elastic element, while the coil assembly is supported above the moving frame by the second elastic element. The active part forms a U-shaped "cradle" structure, and the coil assembly of the driven part is located inside the U-shaped "cradle" structure formed by the active part. This makes full use of the internal space of the motor and effectively reduces the size of the motor. Especially in the field of micro linear motors, it can be adapted to a variety of different handheld electric devices, reducing the space occupied by the motor and increasing the battery storage space of the device.

[0066] 4. By setting the first elastic element as a V-shaped structure, the opening size of the first elastic element gradually decreases from the first bend to the first opening. When the first opening is hung on the outer frame, the hanging ear plate located in the first bend is clamped and pre-tightened, so that the first elastic element can not only suspend the moving frame in the outer frame, but also clamp and pre-tighten the moving frame based on the opening size, and at the same time take into account the elastic restoring force of the moving frame movement.

[0067] 5. By setting the second elastic element to a V-shaped structure, the opening size of the second elastic element gradually increases from the second bend to the second opening. The second bend is sleeved and positioned at both ends of the coil assembly in the moving direction, and the second opening is connected to the outer frame. Thus, the ends of the coil assembly are clamped and pre-tightened by the second bend. That is, the second elastic element can not only support the coil assembly on the moving frame, but also clamp and pre-tighten both ends of the coil assembly based on the opening size, while also taking into account the elastic restoring force of the coil assembly's movement.

[0068] 6. By using columnar elastic steel wires for the first and second elastic elements, the columnar structure of the first and second elastic elements can withstand forces in multiple directions. For example, in the radial direction, they are less prone to deformation and damage compared to sheet-like springs. In this embodiment, the columnar structure of the first elastic element can stably suspend the moving frame, and the columnar structure of the second elastic element can stably support the coil assembly. Simultaneously, compared to the reciprocating linear motion of sheet-like springs, the columnar structure of the first and second elastic elements results in less vibration and lower noise, effectively reducing motor noise and vibration. This is especially beneficial for handheld electric devices, reducing hand-held vibration and device noise, and improving the user experience.

[0069] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A linear vibration motor, characterized in that: It includes an outer frame, an active part, and a driven part, wherein the active part is connected to the outer frame, and the driven part is connected to the active part; The active unit includes a movable frame, a permanent magnet movable shaft, and a first elastic element. One end of the first elastic element is connected to the outer frame, and the other end is connected to the movable frame. The permanent magnet movable shaft is positioned on the movable frame. The driven part includes a coil assembly and a second elastic element. The coil assembly is arranged around the outer periphery of the permanent magnet moving shaft. One end of the second elastic element is connected to the coil assembly, and the other end is connected to the moving frame.

2. The linear vibration motor according to claim 1, characterized in that: The first elastic element and the second elastic element are bent U-shaped or V-shaped elastic steel wires; The movable frame includes a hanging ear plate and a connecting plate that are fixedly connected or integrally formed. The two hanging ear plates are respectively disposed at both ends of the connecting plate in the moving direction. One end of the hanging ear plate near the connecting plate is hung on the first elastic member, and the other end of the hanging ear plate is fastened to the permanent magnet moving shaft. One end of the second elastic element is connected to the connecting plate, and the other end is fastened to the coil assembly.

3. The linear vibration motor according to claim 2, characterized in that: The movable frame is positioned near the bottom of the outer frame, and there is a gap between the movable frame and the outer frame; The first elastic member and the second elastic member have opposite opening directions. The first elastic member suspends the movable frame inside the outer frame, and the second elastic member supports the coil assembly on the movable frame.

4. The linear vibration motor according to claim 2, characterized in that: The first elastic element is made of bent V-shaped elastic steel wire; The first elastic member includes a first bent portion and a first opening portion, and the size of the opening of the first elastic member gradually decreases from the first bent portion to the first opening portion; The first bent portion is sleeved on the end of the hanging ear plate near the bottom of the outer frame, and the first opening portion is hung on the outer frame.

5. The linear vibration motor according to claim 2, characterized in that: The second elastic element is made of bent V-shaped elastic steel wire; The second elastic member includes a second bent portion and a second opening portion, and the size of the opening of the second elastic member gradually increases from the second bent portion to the second opening portion; The second bent portion is sleeved and positioned at both ends of the coil assembly in the direction of movement, and the second opening portion is connected to the outer frame.

6. The linear vibration motor according to claim 2, characterized in that: The active unit also includes a support frame and an output shaft. One end of the support frame is connected to the connecting plate, and the other end passes through the outer frame and positions the output shaft.

7. The linear vibration motor according to claim 1, characterized in that: The coil assembly includes a wire fixing block, a magnetic coil, a wire frame, and a coil. The wire fixing block is disposed at both ends of the wire frame, the magnetic coil is sleeved on the outer periphery of the wire frame, and the coil is wound on the wire frame. The magnetic coil has a through hole in the middle, and the through hole is an elliptical hole.

8. The linear vibration motor according to claim 1, characterized in that: The permanent magnet moving shaft includes a shaft body and a magnetic ring, with the magnetic ring sleeved on the outer periphery of the shaft body; The magnetic ring remains within the area of ​​the coil assembly as the shaft moves.

9. The linear vibration motor according to any one of claims 1-8, characterized in that: The first elastic element and the second elastic element are made of elastic steel wire with a columnar structure.

10. An electric device, characterized in that: Including the linear vibration motor as described in claim 9.

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