CN210297517U

CN210297517U - Linear vibration motor

Info

Publication number: CN210297517U
Application number: CN201921556119.1U
Authority: CN
Inventors: 董超; 林聪�; 彭坤; 刘富泉
Original assignee: Henan Hozel Electronics Co Ltd
Current assignee: Henan Hozel Electronics Co Ltd
Priority date: 2019-09-18
Filing date: 2019-09-18
Publication date: 2020-04-10
Anticipated expiration: 2029-09-18

Abstract

The utility model discloses a linear vibration motor, including shell, stator part and active cell part. The stator part is fixedly arranged in the shell and comprises a coil, the rotor part comprises a mass block, a magnet and an elastic sheet, the magnet is arranged in the mass block and corresponds to the coil, and the elastic sheet movably connects the mass block in the shell. The elastic sheet comprises an elastic sheet main body and a first bending part and a second bending part which extend out from the two ends of the elastic sheet main body in the same direction in an integrated mode, the lengths of the first bending part and the second bending part are different, and the magnet is multi-stage magnetic steel. The utility model discloses replace polylith magnet steel with multistage magnet steel, utilize a two poles of the earth magnet steel alright promptly for providing drive power for vibration system, reduced the assembly degree of difficulty when having reduced the quantity of spare part.

Description

Linear vibration motor

Technical Field

The utility model relates to a motor field, concretely relates to linear vibration motor.

Background

With the development of communication technology, portable electronic products, such as mobile phones, handheld game consoles or handheld multimedia entertainment devices, have come into the lives of people. In these portable electronic products, a micro vibration motor is generally used for system feedback, such as incoming call prompt of a mobile phone, vibration feedback of a game machine, and the like. However, with the trend of electronic products being lighter and thinner, various components inside the electronic products also need to adapt to the trend, and micro vibration motors are no exception.

At present, most of magnetic circuit systems of linear motors adopt a multi-magnetic circuit structure, and because the magnetic steel is tiny and has polarity, the magnetic steel is difficult to assemble, a large amount of manpower and material resources are consumed, and how to effectively solve the assembly problem is a difficult problem in the field.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a linear vibration motor to solve the problem that exists among the above-mentioned prior art.

In order to solve the above problem, according to the utility model discloses an aspect provides a 1 linear vibration motor, linear vibration motor includes shell, stator part and active cell part, stator part fixed mounting in the shell and including the coil, the active cell part includes quality piece, magnet and shell fragment, the magnet install in quality piece and with the coil corresponds, the shell fragment will quality piece movably connects in the shell, wherein, the shell fragment includes the shell fragment main part and follows first kink and the second kink that the both ends of shell fragment main part an organic whole stretched out to same direction, first kink with the length of second kink is different, and the magnet is multistage magnet steel.

In one embodiment, the first bent portion of the elastic piece is connected to an inner wall of the housing on one side of the housing, the second bent portion of the elastic piece is connected to a side portion of the mass block opposite to the other side of the housing, and an end of the first bent portion and the second bent portion are parallel to each other in a length direction of the housing.

In one embodiment, the linear vibration motor further includes stoppers disposed at both ends of the housing, and the width of the spring main body of the spring is gradually reduced from both ends to the middle portion, so as to form a stopper escape portion in the middle portion of the spring main body.

In one embodiment, the elastic sheet main body and the first bending part or the second bending part form an obtuse angle; in one embodiment, the ends of the first and second bent portions have the same coordinate position in the length direction of the housing.

In one embodiment, the middle part of the mass block forms an opening for accommodating the magnet and the coil, and two ends of the mass block form sound insulation grooves for installing sound insulation materials;

in one embodiment, the sound insulation groove is arranged along the thickness direction of the mass block and forms a semi-cylindrical groove;

in one embodiment, the sound-insulating groove at one end is arranged close to the rear surface of the mass block, and the sound-insulating groove at the other end is arranged close to the front surface of the mass block;

in one embodiment, a coil groove is arranged above the opening, the coil is accommodated in the coil groove, and the size of the coil groove is obviously larger than that of the coil, so that the coil can move in the coil groove.

In one embodiment, the linear vibration motor further includes a core, and a pole core groove is provided on a surface of the mass facing the housing, and the pole core is mounted in the pole core groove.

In one embodiment, the linear vibration motor further includes a cover plate, the stator part further includes a bottom circuit board fixed on the cover plate, and an inner coil spot welding pad for a coil is provided on a surface of the bottom circuit board;

in one embodiment, the bottom circuit board comprises a first portion and a second portion, the area of the first portion is larger than that of the second portion, an inner coil spot welding pad is arranged on the first portion, and an outer pad is arranged on the second portion;

in one embodiment, the bottom circuit board is provided with two external pads and two internal coil spot welding pads, wherein one internal coil spot welding pad and the external pad are integrally formed and connected through a connecting strip;

in one embodiment, the two inner coil spot welding pads are located at two diagonal corners of the first portion, respectively, and the two outer pads are arranged side by side on the second portion.

In one embodiment, the linear vibration motor further includes a plurality of blocking pieces, and the elastic pieces are fixed on the mass block and the side wall of the housing through the blocking pieces.

In one embodiment, the linear vibration motor further includes stoppers provided in the housing and disposed at both ends of the housing, and a cover plate engaged with the housing to enclose the mover and stator parts in a space defined by the cover plate and the housing;

in one embodiment, the stop blocks are arranged to be close to inner walls of two ends of the housing, the spring main body of the spring is arranged between the mass block and the stop blocks, and when the mover portion moves in the housing, the stop blocks can prevent the mass block and the spring from directly impacting the inner walls of the housing.

In one embodiment, the magnet is a two-stage magnetic steel, and the upper surface of the left side of the two-stage magnetic steel is an N pole, the upper surface of the right side is an S pole, the lower surface of the left side is an S pole, and the lower surface of the right side is an N pole.

The utility model discloses replace the polylith magnet steel among the prior art with multistage magnet steel, utilize a two poles of earth magnet steel promptly alright for vibration system provides drive power, reduced the assembly degree of difficulty when having reduced the quantity of spare part. Furthermore, the utility model provides a linear vibration motor through utilizing the shell fragment with the quality piece with the shell around interior wall connection to hug closely the end wall at the inside both ends of shell and set up the dog, through setting up the dog between shell and shell fragment, play the effect of protecting sheathing inner wall and quality piece, and in the partial motion process of active cell, the motion is more steady and can reduce the machine noise.

Drawings

Fig. 1 is an exploded perspective view of a linear vibration motor according to an embodiment of the present invention;

fig. 2 is a front view of the linear vibration motor of fig. 1;

fig. 3 is a sectional view of the linear vibration motor of fig. 1;

FIG. 4 is a top view of the bottom circuit board;

FIG. 5 is a perspective view of a mass;

FIG. 6 is a top view of the mass of FIG. 5;

FIG. 7 is a bottom view of the mass of FIG. 5;

fig. 8 is a perspective view of a spring plate according to an embodiment of the present invention;

FIG. 9 is a front view of the spring plate of FIG. 8;

FIG. 10 is a left side view of the spring plate of FIG. 8;

fig. 11 is a perspective view of a magnet and coil arrangement according to an embodiment of the present invention.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended as limitations on the scope of the invention, but are merely illustrative of the true spirit of the technical solution of the invention.

In the following description, for the purposes of illustrating various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details. In other instances, well-known devices, structures and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

In the following description, for the sake of clarity, the structure and operation of the present invention will be described with the aid of directional terms, but the terms "front", "rear", "left", "right", "outer", "inner", "outer", "inward", "upper", "lower", etc. should be understood as words of convenience and not as words of limitation.

The utility model discloses a linear vibrating motor generally includes shell, stator part and active cell part, and stator part fixed mounting includes the coil in the shell, and the active cell part includes quality piece, magnet and shell fragment, and the magnet is installed in the quality piece and corresponds the cooperation with the coil, and the shell fragment is connected quality piece movably in the shell, and wherein, this magnet is multistage magnet steel. The utility model discloses replace the polylith magnet steel among the prior art with multistage magnet steel, utilize a two poles of earth magnet steel promptly alright for vibration system provides drive power, reduced the assembly degree of difficulty when having reduced the quantity of spare part.

In one embodiment, the spring of the mover portion includes a spring main body, and a first bending portion and a second bending portion integrally extending from two ends of the spring main body in the same direction, and the first bending portion and the second bending portion have different lengths. The arrangement can reserve space for necessary parts and simultaneously does not influence the running quality of the motor.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Fig. 1 is an exploded perspective view of a linear vibration motor 100 according to an embodiment of the present invention, fig. 2 is a front view of the linear vibration motor 100 of fig. 1, and fig. 3 is a sectional view of the linear vibration motor 100 of fig. 1. As shown in fig. 1 to 3, the linear vibration motor 100 includes a housing 10, a stator portion 30 and a mover portion 20, the stator portion 30 is fixedly installed in the housing 10 and includes a coil 31, the mover portion 20 includes a mass 21, a magnet 23 and a spring plate 22, the magnet 23 is installed in the mass 21 and correspondingly cooperates with the coil 31, the spring plate 22 movably connects the mass 21 in the housing 10, wherein the magnet 23 is multi-stage magnetic steel, such as two-stage magnetic steel, which will be further described below.

Fig. 4 is a top view of the bottom circuit board 32. As shown in fig. 4 in conjunction with fig. 1, the stator portion 30 further includes a bottom circuit board 32, the bottom circuit board 32 may be, for example, an FPC board (flexible circuit board), the bottom circuit board 32 includes a first portion 321 and a second portion 322, an area of the first portion 321 is larger than an area of the second portion 322, and the first portion 321 is provided with an inner coil spot welding pad 323 and the second portion 322 is provided with an outer pad 324. In the present embodiment, two outer pads and two inner coil spot welding pads are provided on the bottom circuit board 32, wherein one inner coil spot welding pad 323 is formed integrally with the outer pad 234 and connected by a connection bar 325, wherein the two inner coil spot welding pads 323 are respectively located at two diagonal corners of the first portion 321, and the two outer pads 324 are arranged side by side on the second portion 322. The bottom circuit board 32 is in electrical communication with the coil 31 through the inner coil spot weld pad 323 and is connected to external circuitry through the outer pad.

Fig. 5 is a perspective view of the mass 21, fig. 6 is a top view of the mass 21 of fig. 5, and fig. 7 is a bottom view of the mass 21 of fig. 5. As shown in fig. 5 to 7, the mass block 21 has a central portion formed with an opening 211 for receiving the magnet 23 and the coil 31, and both ends formed with soundproof grooves 2121 for mounting soundproof materials. Specifically, the soundproof groove 2121 is provided in the thickness direction of the mass block 21 and forms one semicylindrical groove. Preferably, the noise insulation recess 2121 at one end (e.g., the right end noise insulation recess of the mass 21 shown in fig. 5-6) is disposed near the rear surface (the top surface shown in fig. 5) of the mass 21, and the noise insulation recess 2121 at the other end (e.g., the left end noise insulation recess of the mass 21 shown in fig. 5-6) is disposed near the front surface (the bottom surface shown in fig. 5) of the mass 21. A coil recess 2111 is provided above the opening 211, the coil 31 is accommodated in the coil recess 2111, and the size of the coil recess 2111 is significantly larger than that of the coil 31, so that the coil 31 can move in the coil recess 2111. Specifically, in the present invention, since the coil 2111 is fixed to the housing, the mover section 20 performs a reciprocating linear motion in the left and right directions with respect to the coil 31 by the magnetic force and the elastic force of the spring 31.

Referring to fig. 5-7 in conjunction with fig. 2-3, the bottom of the opening 211 of the mass 21 is also provided with a pole piece mounting groove 241. The mover portion 20 further includes a pole piece 24, and the pole piece 24 is disposed in the pole piece mounting groove 241 and opposite to the magnet 23 to reinforce the magnetic field.

Fig. 8 is a perspective view of the elastic piece 22 according to an embodiment of the present invention, fig. 9 is a front view of the elastic piece 22 of fig. 8, and fig. 10 is a left side view of the elastic piece 22 of fig. 8. As shown in fig. 8 to 10, the mover portion 20 in this example includes two resilient pieces 22, and the two resilient pieces 22 are respectively disposed at left and right ends of the mass 21. Specifically, the spring plate 22 includes a spring plate main body 221, and a first bent portion 222 and a second bent portion 223 integrally extending from two ends of the spring plate main body 221 in the same direction, and the lengths of the first bent portion 222 and the second bent portion 223 are different.

Specifically, in the present embodiment, the length of the first bending portion 222 is shorter, the length of the second bending portion 223 is longer, an angle formed by the resilient tab main body 221 and the first bending portion 222 is an obtuse angle, and an angle formed by the resilient tab main body 221 and the second bending portion 223 is an acute angle. Preferably, the first bent portion 222 and the second bent portion 223 are parallel to each other. Since the elastic piece main body 221 and the second bent portion 223 are not in a perpendicular relationship, and the lengths of the second bent portion 223 and the first bent portion 222 are different, the end of the first bent portion 222 and the end of the second bent portion 223 are aligned with each other, that is, when the elastic piece 22 is installed in the housing 10, the end of the first bent portion 222 and the end of the second bent portion 223 are at the same length of the housing 10.

With continued reference to fig. 10, the width of the main body 221 of the striking plate 22 gradually decreases from the two ends to the middle to form a stopper escape portion 224 in the middle of the main body 221 to accommodate a stopper, which will be further described below.

Referring back to fig. 1-2, the mover section 20 of the linear vibration motor 100 further includes a blocking piece 25 through which the first and second

bent portions

222 and 223 of the resilient piece 22 are fixed to the rear side portion of the mass 21 and the front side wall of the case 10, respectively. In fig. 2, the first bent portion 222 of the elastic piece 22 is fixed to the rear portion of the left end of the mass 21, the second bent portion 223 is fixed to the front inner side wall of the left end of the housing 10, the first bent portion 222 is fixed to the front portion of the right end of the mass 21, and the second bent portion 223 of the elastic piece 22 is fixed to the rear inner side wall of the right end of the housing 10. When current passes through the coil 31, the magnetic field generated by the magnet 23 is acted by lorentz force, so that the mass block drives the mover parts such as the magnet to move left and right, and the elastic sheets 22 limit the movement range of the mover part 20 in the movement process. Because the connection points of the elastic sheets 22, the mass block 21 and the inner wall of the shell 10 are positioned at two ends of the mass block instead of the two ends of the mass block as in the prior art, the motor operates stably and has low noise in the operation process.

Fig. 11 is a perspective view of the magnet 23 and the coil 31 according to an embodiment of the present invention. As shown in fig. 11, the magnet 23 is a two-stage magnetic steel, the left upper surface of the magnetic steel is an N pole, the right upper surface is an S pole, the left lower surface is an S pole, and the right lower surface is an N pole. Compared with a plurality of pieces of magnetic steel, the two-stage magnetic steel can provide driving force for the vibration system by utilizing one piece of two-stage magnetic steel, so that the number of parts is reduced, and meanwhile, the assembly difficulty is reduced. The three-pole magnetic circuit linear motor, the four-pole magnetic circuit linear motor and the two-pole magnetic circuit linear motor have the same principle, and are not described in detail herein.

In one embodiment, the linear vibration motor 100 further includes stoppers 50 and a cover plate 40, the stoppers 50 being disposed in the housing 10 and disposed at both ends of the housing 10, the cover plate 40 being engaged with the housing 10 to enclose the entire mover section 20 and the stator section 30 in a space defined by the cover plate 40 and the housing 10. Referring to fig. 3, the stoppers 50 are disposed closely to inner walls of both ends of the case 10, and the spring body 21 of the spring 20 is disposed between the mass 21 and the stoppers 50, and the stoppers 50 may prevent the mass 21 and the spring 22 from directly hitting the inner walls of the case 10 when the mover portion 21 moves within the case.

According to the above embodiment, the utility model discloses replace the polylith magnet steel among the prior art with multistage magnet steel, utilize a two poles of the earth magnet steel promptly alright for vibration system provides drive power, reduced the assembly degree of difficulty when having reduced the quantity of spare part.

Furthermore, the utility model provides a linear vibration motor through utilizing the shell fragment with the quality piece with the shell around interior wall connection to hug closely the end wall at the inside both ends of shell and set up the dog, through setting up the dog between shell and shell fragment, play the effect of protecting sheathing inner wall and quality piece, and in the partial motion process of active cell, the motion is more steady and can reduce the machine noise.

The preferred embodiments of the present invention have been described in detail, but it should be understood that various changes and modifications can be made by those skilled in the art after reading the above teaching of the present invention. Such equivalents are intended to fall within the scope of the claims appended hereto.

Claims

1. The utility model provides a linear vibration motor, its characterized in that, linear vibration motor includes shell, stator part and active cell part, stator part fixed mounting in the shell and including the coil, the active cell part includes quality piece, magnet and shell fragment, the magnet install in the quality piece and with the coil corresponds, the shell fragment will quality piece movably connects in the shell, wherein, the shell fragment includes the shell fragment main part and follows the integrative first kink and the second kink to stretching out of same direction in the both ends of shell fragment main part, first kink with the length of second kink is different, and the magnet is multistage magnet steel.

2. The linear vibration motor according to claim 1, wherein the first bent portion of the spring piece is connected to an inner wall of the housing on one side of the housing, the second bent portion of the spring piece is connected to a side portion of the mass opposite to the other side of the housing, and an end of the first bent portion and the second bent portion are parallel to each other in a length direction of the housing.

3. The linear vibration motor according to claim 1, further comprising stoppers provided at both ends of the housing, and the width of the striking plate main body of the striking plate is gradually reduced from both ends to a middle portion to form a stopper escape portion at the middle portion of the striking plate main body.

4. The linear vibration motor according to claim 1, wherein the spring main body forms an obtuse angle with the first bent portion or the second bent portion.

5. The linear vibration motor according to claim 4, wherein the ends of the first bent portion and the second bent portion have the same coordinate position in the length direction of the housing.

6. The linear vibration motor of claim 1, wherein the mass has a middle portion formed with an opening for receiving the magnet and the coil, and both ends formed with soundproof grooves for mounting soundproof materials.

7. The linear vibration motor according to claim 1, further comprising a core, a pole core groove being provided on a surface of the mass facing the housing, the pole core being mounted in the pole core groove.

8. The linear vibration motor of claim 1, further comprising a cover plate, wherein the stator part further comprises a bottom circuit board fixed to the cover plate, and wherein an inner coil spot welding pad for a coil is provided on a surface of the bottom circuit board.

9. The linear vibration motor of claim 1, further comprising a plurality of stoppers, wherein the resilient pieces are fixed to the mass and the side wall of the housing through the stoppers.

10. The linear vibration motor of claim 1, further comprising stoppers provided in the housing and disposed at both ends of the housing, and a cover plate engaged with the housing to enclose the mover and stator parts in a space defined by the cover plate and the housing.

11. The linear vibration motor of claim 1, wherein the magnet is a two-stage magnetic steel, and a left upper surface of the two-stage magnetic steel is an N pole, a right upper surface thereof is an S pole, a left lower surface thereof is an S pole, and a right lower surface thereof is an N pole.