A linear vibration motor and electric device

Abstract

The present invention discloses a linear vibration motor and electric equipment, including 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 part includes 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, the permanent magnet moving shaft is positioned on the moving frame, and the driven part includes a coil assembly and a second elastic member, the coil assembly is arranged around the outer peripheral 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. The moving frame is driven to move synchronously by arranging the permanent magnet moving shaft, and the moving frame is elastically connected to the coil assembly, so that 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 output outward by the moving frame is strengthened, such as when applied to electric shavers and electric clippers, the shear force output by the motor is strengthened, and the shear force is higher than that of the shrapnel-type magnetic levitation motor.

Description

Technical Field

[0001] The present invention relates to the field of micro linear motors, and in particular to a linear vibration motor and an electric device. Background Art

[0002] Micro linear motors are commonly used in electric devices such as hair clippers and razors, and the shearing effect is achieved through the linear reciprocating motion of the linear motor. The shearing force output by the linear motor is one of the important indicators applied to the above-mentioned shearing electric equipment, which directly affects the use effect of the equipment. For example, the Chinese utility model patent with application number 2023219086206 is a common magnetic levitation linear motor used in hair clippers and razor equipment. The output shaft is supported by springs at both ends, and the output shaft performs reciprocating linear motion. The shearing force output by this structure is relatively small. Summary of the invention

[0003] The invention provides a linear vibration motor and an electric device, aiming to solve the problem that the shear force output by the existing linear vibration motor is relatively small.

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

[0005] Preferably, the first elastic member and the second elastic member are bent U-shaped or V-shaped elastic steel wires; the movable frame comprises a lug plate and a connecting plate that are fixedly connected or integrally connected, and the two lug plates are respectively arranged at both ends of the connecting plate in the moving direction, and one end of the lug plate close to the connecting plate is hung on the first elastic member, and the other end of the lug plate is extended and fastened to the permanent magnet moving shaft; one end of the second elastic member is connected to the connecting plate, and the other end is buckled into the coil assembly.

[0006] Preferably, the movable frame is arranged close to the bottom direction of the outer frame, and there is a distance between the movable 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 movable frame in the outer frame, and the second elastic member supports the coil assembly on the movable frame.

[0007] Preferably, the first elastic member is a bent V-shaped elastic steel wire; the first elastic member includes 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 ear plate close to the bottom of the external frame, and the first opening portion is hung on the external frame.

[0008] Preferably, the second elastic member is made of a bent V-shaped elastic steel wire; the second elastic member includes 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 socketed 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 active part further 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.

[0010] Preferably, the coil assembly includes a steel wire fixing block, a magnetic conductive ring, a wire frame and a coil, the steel wire fixing blocks are respectively arranged at both ends of the wire frame, the magnetic conductive ring is sleeved on the outer peripheral side of the wire frame, and the coil is wound on the wire frame; a through hole is opened in the middle of the magnetic conductive ring, and the through hole is an elliptical hole.

[0011] Preferably, the permanent magnet movable shaft comprises a shaft body and a magnetic ring, wherein the magnetic ring is sleeved on the outer peripheral side of the shaft body; and the magnetic ring is always within the region of the coil assembly when the shaft body moves.

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

[0013] The present invention also provides an electric device, comprising any one of the linear vibration motors described above.

[0014] Compared with the prior art, the linear vibration motor and electric device provided by the present invention have the following beneficial effects: 1. The movable frame is driven to move synchronously by setting a permanent magnetic movable shaft. The movable frame is elastically connected to the coil assembly, so that when the movable frame moves, the coil assembly follows the movable frame. When the moving direction of the movable frame and the elastic force of the second elastic member are in the same direction, the moving force output outward by the movable frame is strengthened. For example, when it is applied to electric shavers and electric clippers, the shear force output by the motor is strengthened, which has a higher shear force than the traditional shrapnel-type magnetic levitation motor.

[0015] 2. The first elastic member and the second elastic member are arranged to adopt bent U-shaped or V-shaped elastic steel wires. The first elastic members at both ends suspend the movable frame in the outer frame, and the second elastic member is cooperated to support the coil assembly above the movable frame, so that when the movable frame moves outward in a straight line, the coil assembly can be driven to form a superposition effect of resonance, thereby increasing the outward output force, that is, the moving force of the movable frame is used to drive the coil assembly to move, and no additional driving equipment is required.

[0016] 3. The mobile frame is suspended in the outer frame by the first elastic member, and the second elastic member supports the coil assembly above the mobile frame. The active part forms a U-shaped "cradle" structure, and the coil assembly of the driven part is located in the U-shaped "cradle" structure formed by the active part, so that the internal space of the motor is fully utilized and the size of the motor is effectively reduced, especially in the field of micro linear motors. It can be adapted to a variety of different handheld electric devices, reduce the space occupied by the motor, and increase the battery storage space of the device.

[0017] 4. The first elastic member is set as a V-shaped structure, and the opening size of the first elastic member gradually decreases from the first bending portion to the first opening portion. The first opening portion is hung on the external frame, and the ear plate located in the first bending portion is clamped and pre-tightened, so that the first elastic member can not only suspend the mobile frame in the external frame, but also clamp and pre-tighten the mobile frame based on the opening size, and at the same time take into account the elastic restoring force of the mobile frame movement.

[0018] 5. The second elastic member is set as a V-shaped structure, 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 the two ends of the coil assembly in the moving direction, and the second opening portion is connected to the outer frame, so that the ends of the coil assembly are clamped and pre-tightened by the second bending portion. That is, the second elastic member can not only support the coil assembly on the moving frame, but also clamp and pre-tighten the two ends of the coil assembly based on the opening size, and at the same time take into account the elastic restoring force of the movement of the coil assembly.

[0019] 6. By using elastic steel wires 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 forces in multiple directions. For example, they are less likely to be deformed and damaged in the radial direction than sheet-shaped springs. In this embodiment, the first elastic member formed by the columnar structure can stably suspend the mobile frame, and the second elastic member formed by the columnar structure can stably support the coil assembly. At the same time, compared with the reciprocating linear motion output by the sheet-shaped springs, the first elastic member and the second elastic member with a columnar structure have less vibration and lower noise during operation, which can effectively reduce the noise and vibration of the motor, especially for handheld electric devices, reducing the user's handheld vibration and device noise, and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0021] Figure 1 It is a schematic structural diagram of a linear vibration motor provided by the first embodiment of the present invention.

[0022] Figure 2 It is a schematic structural diagram of the active part of the linear vibration motor provided by the first embodiment of the present invention.

[0023] Figure 3 It is a schematic structural diagram of a driven part in a linear vibration motor provided in the first embodiment of the present invention.

[0024] Figure 4 It is a schematic diagram of the exploded structure of the coil assembly in the linear vibration motor provided in the first embodiment of the present invention.

[0025] Figure 5 It is a schematic structural diagram of a first elastic member in a linear vibration motor provided in a first embodiment of the present invention.

[0026] Figure 6 It is a schematic structural diagram of the second elastic member in the linear vibration motor provided by the first embodiment of the present invention.

[0027] Figure 7 It is a schematic structural diagram of an outer frame of a linear vibration motor provided in the first embodiment of the present invention. Description of the label: 1. External frame; 11. Top plate; 12. Side plate; 13. Bottom plate; 14. Wire plate; 15. Soft-wrapped wire; 2. Active part; 21. Moving frame; 211. 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; 24. Support frame; 25. Output shaft; 3. driven part; 31. coil assembly; 311. steel wire fixing block; 312. magnetic conductive ring; 3121. through hole; 313. wire rack; 314. coil; 32, second elastic member; 321, second bending portion; 322, second opening portion; 100. Groove. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0030] It should be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0031] Please combine Figure 1 , Figure 2 and Figure 3 The first embodiment of the present invention discloses a linear vibration motor, including an outer frame 1, an active part 2 and a driven part 3, wherein the active part 2 is connected to the outer frame 1, and the driven part 3 is connected to the active part 2.

[0032] The active part 2 includes 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, and 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.

[0033] The driven part 3 includes a coil assembly 31 and a second elastic member 32 . The coil assembly 31 is disposed around the outer circumference 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 .

[0034] It can be understood that the coil assembly 31 and the permanent magnet moving shaft 22 are spaced apart, and there is a distance between the coil assembly 31 and the permanent magnet moving shaft 22. The coil assembly 31 is a solenoid structure based on a wound coil, and 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, so that the moving frame 21 and the permanent magnet moving shaft 22 move synchronously, and the coil assembly 31, driven by the moving frame 21, also moves with the permanent magnet moving shaft 22 based on the second elastic member 32.

[0035] It can be understood that since the permanent magnet movable shaft 22 and the movable frame 21 are rigidly connected, and the movable frame 21 and the coil assembly 31 are elastically connected through the second elastic member 32, the permanent magnet movable shaft 22 and the movable frame 21 move synchronously, and the reciprocating motion frequencies between the coil assembly 31 and the movable frame 21 are different. Under high-frequency vibration, when the coil assembly 31 drives the second elastic member 32 to act on the movable frame 21 The elastic restoring force is the same as the moving direction of the permanent magnet movable shaft 22, the shear force output outward by the permanent magnet movable shaft 22 is superimposed on the force of the second elastic member, which also increases the shear force output outward by the linear vibration motor of the present application.

[0036] 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, common bendable elastic metal materials such as stainless steel, spring steel or beryllium copper are used, and the two ends of the bent first elastic member 23 and the second elastic member 32 are divided into a bending area and an opening area.

[0037] The mobile frame 21 includes a lug plate 211 and a connecting plate 212 that are fixedly connected or integrally connected, and the two lug plates 211 are respectively arranged at both ends of the connecting plate 212 in the moving direction, and one end of the lug 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 lug plate 211 is tightly connected to 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 with the coil assembly 31.

[0038] Specifically, combined Figure 2 and Figure 4 As shown, in the present embodiment, the first elastic member 23 adopts a bent V-shaped elastic steel wire, and the first elastic member 23 includes a first bent portion 231 and a first opening portion 232. The first bent portion 231 is a closed structure that can be used for hanging, and the first opening portion 232 is an open structure; correspondingly, the second elastic member 32 also adopts a bent V-shaped elastic steel wire, and the second elastic member 32 includes a second bent portion 321 and a second opening portion 322.

[0039] It can be understood that the V-shaped elastic steel wire means that the opening size changes continuously from the opening area to the bending area. In this 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 on the bottom of the ear plate 211 near one end of the connecting plate 212. The first opening portion 232 is hung on the outer frame 1, and the ear plate 211 located in the first bending portion 231 is clamped and pre-tightened. On the contrary, 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 and positioned at both ends of the coil assembly 31 in the moving direction. The second opening portion 322 is connected to the outer frame, and the ends of the coil assembly 31 are clamped and pre-tightened by the second bending portion 321.

[0040] like Figure 3 As shown in the figure, the opening areas of the first elastic member 23 and the second elastic member 32 are arranged in opposite directions, that is, the first opening portion 232 and the second opening portion 322 are respectively facing opposite directions, and the first bending portion 231 is arranged close to the bottom of the outer frame 1, so that the movable frame 21 is suspended in the outer frame 1 by the first elastic members 23 at both ends, and the coil assembly 31 is supported on the movable frame 21 by the second elastic member 32. When the coil assembly 31 is energized to form a magnetic field, the permanent magnetic movable shaft 22 is forced to actively move along the axial direction, and the movable frame 21 moves synchronously, and the coil assembly 31 follows the movable frame 21 (or the permanent magnetic movable shaft 22) driven by the second elastic member 32.

[0041] Optionally, in other embodiments, the first elastic member 23 and the second elastic member 32 may also adopt a U-shaped bending structure, and grooves for pre-tightening the steel wire may be set at the ends of the ear plate 211 and the coil assembly 31, and a pre-tightening effect of the bending area may be achieved, or a protrusion may be directly set at the corresponding pre-tightening position of the elastic member to form a limiting effect. For example, the second elastic member 32 is provided with a raised rib at the lower edge position near the end of the coil assembly 31 to support the coil assembly 31. As long as the first elastic member 23 can suspend the movable frame 21 and the second elastic member 32 can support the coil assembly 31 on the movable frame 21, no limitation is made here.

[0042] Optionally, as another embodiment, the first elastic member 23 and the second elastic member 32 can be made of straight steel wire, that is, unbent elastic steel wire, and both ends are fixed to the object by welding or clamping. For example, when the first elastic member 23 is made of straight steel wire, both ends are fixed to the outer frame 1 and the ear plate 211 by welding, or by clamping, such as opening a pre-tightening hole on the outer edge of the outer frame 1 and the ear plate 211, and screwing a clamping screw into the side of the pre-tightening hole to clamp the steel wire inserted into the hole, so as to achieve a fixing effect.

[0043] Optionally, in some special embodiments, the first elastic member 23 and the second elastic member 32 may also adopt sheet-like spring plates, which may be set as non-bent V-shaped or U-shaped spring plates, or set as the above-mentioned strip spring plates with both ends fixed, as long as the deformation surface direction of the spring plates is set in the axial movement direction of the permanent magnet moving axis 22.

[0044] 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 formed and connected, the top plate 11 and the bottom plate 13 can be used to connect and fix external equipment, and the side plate 12 is a baffle structure provided on the moving frame 21 in the moving direction, so the outer frame 1 forms an open structure in the shape of a Chinese character, which is beneficial to the heat dissipation of the motor. In other embodiments, the outer frame 1 can also be set as a closed structure according to different adapter devices, which will not be repeated here.

[0045] It can be understood that a wire plate 14 is provided on the side of the bottom plate 13 , and a soft-coated wire 15 is connected to the wire plate 14 , and the soft-coated wire 15 is electrically connected to the coil assembly 31 .

[0046] Please continue to combine Figure 1 and Figure 2 The active part 2 also includes a support frame 24 and an output shaft 25. One end of the support frame 24 is connected to the connecting plate 212, and the other end passes through the outer frame 1 and positions the output shaft 25. The output shaft 25 is used to connect to an external object, such as a razor head, to drive the head to move linearly.

[0047] It can be understood that the top of the outer frame 1 is the side close to 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 output shaft 25, that is, the side close to the bottom plate 13.

[0048] The movable frame 21 is arranged close to the bottom direction of the outer frame 1, and there is a distance between the movable frame 21 and the outer frame 1. The height of the first elastic member 23 from the outer frame 1 to the ear plate 211 is greater than the length of the ear plate 211. The length of the first elastic member 23 is greater than the length of the second elastic member 32, so that the active part 2 forms a suspended cradle structure while a driven driven part 3 is formed on the active part 2. Based on the resonance effect of the driven part 3 following the movement, the shear force output outward by the active part 2 is increased.

[0049] Please combine Figure 3 and Figure 4The coil assembly 31 includes a steel wire fixing block 311, a magnetic ring 312, a wire frame 313 and a coil 314. The steel wire fixing block 311 is disposed at both ends of the wire frame 313. The magnetic ring 312 is sleeved on the outer circumference of the wire frame 313. The coil 314 is wound on the wire frame 313. A through hole 3121 is provided in the middle of the magnetic ring 312, and the through hole 3121 is an elliptical hole.

[0050] It can be understood that the end of the steel wire fixing block 311 is provided with a groove 100 for the second bending portion 321 to engage, and the wire frame 313 is used to sleeve the coil 314. When the permanent magnetic moving shaft 22 moves axially, there will be a small amount of offset in the vertical direction. The through hole 3121 of the magnetic ring 312 is set as an elliptical hole, which can provide space in the vertical direction to avoid collision.

[0051] Please continue reading Figure 2 The permanent magnet moving shaft 22 includes a shaft body 221 and a magnetic ring 222. The magnetic ring 222 is sleeved on the outer peripheral 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.

[0052] It can be understood that the permanent magnetic movable shaft 22 can also adopt a structure in which the whole is a permanent magnet. In this embodiment, by sleeve-mounting a fixed magnetic ring 222 on the shaft body 221, the number of magnetic rings 222 can be a single integrally formed structure or multiple magnetic rings 222 to form a multi-pole structure. For example, when there is a single magnetic ring 222, a single magnetic ring is configured as an NSN or SNS magnetic pole. When there are multiple magnetic rings 222, the magnetic poles between adjacent magnetic rings 222 are different. For example, if there are three magnetic rings 222, the magnetic rings 222 are arranged in a form of NSN or SNS magnetic poles or a single magnetic ring is configured as an NSN or SNS magnetic pole.

[0053] Please continue to combine Figure 1 , Figure 5 and Figure 6In this embodiment, the first elastic member 23 and the second elastic member 32 are bent U-shaped or V-shaped elastic steel wires, and the first elastic member 23 and the second elastic member 32 are elastic steel wires with a columnar structure. The first elastic member 23 and the second elastic member 32 formed by the columnar structure can withstand forces in multiple directions. For example, they are less likely to be deformed and damaged in the radial direction than sheet-shaped shrapnel. In this embodiment, the first elastic member 23 formed by the columnar structure can stably suspend the mobile frame 21, and the second elastic member 32 formed by the columnar structure can stably support the coil assembly 31. At the same time, compared with the reciprocating linear motion output by the sheet-shaped shrapnel, the first elastic member 23 and the second elastic member 32 with a columnar structure have less vibration and lower noise during operation, which can effectively reduce the noise and vibration of the motor, especially for handheld electric devices, reduce the user's handheld vibration and device noise, and improve the user experience.

[0054] The second embodiment of the present invention provides an electric device, which adopts the linear vibration motor provided in the first embodiment mentioned above. The electric device includes common electric shavers, electric clippers and other handheld electric devices. In this embodiment, if the electric device is an electric clipper, the output shaft 25 of the linear vibration motor can output reciprocating linear motion by connecting to a movable cutter head.

[0055] Compared with the prior art, the linear vibration motor and electric device provided by the present invention have the following beneficial effects: 1. The movable frame is driven to move synchronously by setting a permanent magnetic movable shaft. The movable frame is elastically connected to the coil assembly, so that when the movable frame moves, the coil assembly follows the movable frame. When the moving direction of the movable frame and the elastic force of the second elastic member are in the same direction, the moving force output outward by the movable frame is strengthened. For example, when it is applied to electric shavers and electric clippers, the shear force output by the motor is strengthened, which has a higher shear force than the traditional shrapnel-type magnetic levitation motor.

[0056] 2. The first elastic member and the second elastic member are arranged to adopt bent U-shaped or V-shaped elastic steel wires. The first elastic members at both ends suspend the movable frame in the outer frame, and the second elastic member is cooperated to support the coil assembly above the movable frame, so that when the movable frame moves outward in a straight line, the coil assembly can be driven to form a superposition effect of resonance, thereby increasing the outward output force, that is, the moving force of the movable frame is used to drive the coil assembly to move, and no additional driving equipment is required.

[0057] 3. The mobile frame is suspended in the outer frame by the first elastic member, and the second elastic member supports the coil assembly above the mobile frame. The active part forms a U-shaped "cradle" structure, and the coil assembly of the driven part is located in the U-shaped "cradle" structure formed by the active part, so that the internal space of the motor is fully utilized and the size of the motor is effectively reduced, especially in the field of micro linear motors. It can be adapted to a variety of different handheld electric devices, reduce the space occupied by the motor, and increase the battery storage space of the device.

[0058] 4. The first elastic member is set as a V-shaped structure, and the opening size of the first elastic member gradually decreases from the first bending portion to the first opening portion. The first opening portion is hung on the external frame, and the ear plate located in the first bending portion is clamped and pre-tightened, so that the first elastic member can not only suspend the mobile frame in the external frame, but also clamp and pre-tighten the mobile frame based on the opening size, and at the same time take into account the elastic restoring force of the mobile frame movement.

[0059] 5. The second elastic member is set as a V-shaped structure, 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 the two ends of the coil assembly in the moving direction, and the second opening portion is connected to the outer frame, so that the ends of the coil assembly are clamped and pre-tightened by the second bending portion. That is, the second elastic member can not only support the coil assembly on the moving frame, but also clamp and pre-tighten the two ends of the coil assembly based on the opening size, and at the same time take into account the elastic restoring force of the movement of the coil assembly.

[0060] 6. By using elastic steel wires 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 forces in multiple directions. For example, they are less likely to be deformed and damaged in the radial direction than sheet-shaped springs. In this embodiment, the first elastic member formed by the columnar structure can stably suspend the mobile frame, and the second elastic member formed by the columnar structure can stably support the coil assembly. At the same time, compared with the reciprocating linear motion output by the sheet-shaped springs, the first elastic member and the second elastic member with a columnar structure have less vibration and lower noise during operation, which can effectively reduce the noise and vibration of the motor, especially for handheld electric devices, reducing the user's handheld vibration and device noise, and improving the user experience.

[0061] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A linear vibration motor, characterized in that: It comprises an outer frame, an active part and a passive part, wherein the active part is connected to the outer frame, and the passive part is connected to the active part; The active part includes 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 includes a coil assembly and a second elastic member. The coil assembly is arranged around the outer circumference 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.

2. The linear vibration motor according to claim 1, characterized in that: The first elastic member and the second elastic member are bent U-shaped or V-shaped elastic steel wires; The movable frame comprises a lug plate and a connecting plate which are fixedly connected or integrally connected, wherein the two lug plates are respectively arranged at two ends of the connecting plate in the moving direction, one end of the lug plate close to the connecting plate is hung on the first elastic member, and the other end of the lug plate is tightly connected to the permanent magnet movable shaft; One end of the second elastic member is connected to the connecting plate, and the other end is buckled with the coil assembly.

3. The linear vibration motor according to claim 2, characterized in that: The movable frame is arranged close to the bottom direction of the outer frame, and there is a distance between the movable frame and the outer frame; The opening directions of the first elastic member and the second elastic member are opposite to each other. The first elastic member suspends the movable frame in 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 member is a bent V-shaped elastic steel wire; The first elastic member includes 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 ear hanging plate close to 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 member is a bent V-shaped elastic steel wire; The second elastic member includes 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 two ends of the coil assembly in the moving direction, 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 part 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 steel wire fixing block, a magnetic conductive ring, a wire frame and a coil, wherein the steel wire fixing blocks are respectively arranged at two ends of the wire frame, the magnetic conductive ring is sleeved on the outer peripheral side of the wire frame, and the coil is wound on the wire frame; A through hole is provided in the middle of the magnetic conductive ring, and the through hole is an elliptical hole.

8. The linear vibration motor according to claim 1, characterized in that: The permanent magnet movable shaft comprises a shaft body and a magnetic ring, wherein the magnetic ring is sleeved on the outer peripheral side of the shaft body; The magnetic ring is always within the area of ​​the coil assembly when the shaft moves.

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

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

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