CN211530975U - Linear vibration motor - Google Patents

Abstract

The utility model provides a linear vibration motor, which comprises a housin, the oscillator that has the balancing weight, elastic support piece and stator, the stator drive oscillator is along first direction, the second direction, or the vibration of third direction, first direction and second direction mutually perpendicular, the third direction is located on the plane at first direction and second direction place and all is not parallel with first direction and second direction, the casing has the diapire relative and the interval setting with the oscillator, the diapire is relative and the interval setting with the plane at first direction and second direction place, the oscillator has the balancing weight, the stopper has set firmly on the diapire, be equipped with on the balancing weight and supply stopper male spacing groove, the stopper include with first direction vertically first striking face and with second direction vertically second striking face. Compared with the prior art, the utility model discloses a linear vibration motor's limit structure is simple structure not only, do not account for unnecessary space and convenient equipment, and the area of being connected of its stopper and casing is big moreover, and operational reliability is high.

Description

Linear vibration motor

Technical Field

The utility model relates to a motor especially relates to a linear vibrating motor of application in mobile electronic product field.

Background

With the development of electronic technology, portable consumer electronic products, such as mobile phones, handheld game consoles, navigation devices or handheld multimedia entertainment devices, are more and more sought after by people, and these electronic products generally use linear vibration motors to perform system feedback, such as incoming call prompt, information prompt, navigation prompt, vibration feedback of game consoles, and the like. Such a wide application requires a vibration motor having excellent performance and a long service life.

A linear vibration motor in the related art includes a housing having an accommodation space, a vibrator having a weight, an elastic support member fixed to the housing and suspending the vibrator in the accommodation space, and a stator fixed to the housing, one of the vibrator and the stator including a coil, and the other including a permanent magnet. In a linear vibration motor in the related art, the direction of an interaction force generated between a magnetic field formed after a coil is electrified and a permanent magnet magnetic field is designed, so that a vibrator can realize a bidirectional vibration effect; meanwhile, a limiting block is arranged outside the balancing weight to limit the stroke of the bidirectional vibration of the vibrator. However, such a linear vibration motor stopper is generally subjected to an impact in a single direction; or the limiting blocks are respectively arranged in a plurality of directions to limit in a plurality of directions, the combined limiting mode is complex in assembly, the number of the limiting blocks is large, and the welding area of each limiting block is small.

Therefore, it is necessary to provide a new linear vibration motor to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that needs to solve provides a realize two-way vibration and linear vibrating motor that vibration performance is good, this linear vibrating motor's spacing mode not only simple structure, do not account for unnecessary space and convenient equipment, and its stopper is big with the area of being connected of casing moreover, and operational reliability is high.

In order to solve the above technical problem, the present invention provides a linear vibration motor, comprising a housing, a vibrator having a weight, an elastic support member fixed in the housing and suspending the vibrator in the housing, and a stator fixed in the housing, wherein the stator drives the vibrator to vibrate in a first direction, a second direction, or a third direction, the first direction is perpendicular to the second direction, the third direction is located on a plane where the first direction and the second direction are located and is not parallel to the first direction and the second direction, the housing has a bottom wall opposite to the vibrator and spaced from the first direction and the second direction, the bottom wall is spaced from the plane where the first direction and the second direction are located, a stopper is fixedly disposed on the bottom wall, and a stopper-inserting limit groove is disposed on the weight, the limiting block comprises a first impact surface vertical to the first direction and a second impact surface vertical to the second direction.

Preferably, the stator is fixed to the bottom wall, the stator including a coil; the vibrator comprises permanent magnets which are opposite to the stator and are arranged at intervals, and a balancing weight which is connected with the elastic supporting piece and is provided with an accommodating hole for accommodating the permanent magnets, the permanent magnets comprise a first magnetic part and a second magnetic part with opposite magnetic poles, the magnetizing directions of the first magnetic part and the second magnetic part are perpendicular to the plane where the first direction and the second direction are located, and the interface of the first magnetic part and the second magnetic part is perpendicular to the third direction; wherein the coil interacts with the permanent magnet after being electrified to provide a driving force for driving the vibrator.

Preferably, the accommodating hole penetrates through the counterweight block along the magnetizing direction.

Preferably, the coil is around locating on the iron core, the stator is still including pasting and locating keeping away from of coil the magnetic conduction piece of oscillator one side, the magnetic conduction piece with the iron core is connected.

Preferably, the magnetic conductive sheet is provided with a yielding port, and a welding lead of the coil is led out from the yielding port.

Preferably, the coil is racetrack shaped, and the long axis of the coil is parallel or perpendicular to the interface.

Preferably, the stator portion is inserted into the receiving hole.

Preferably, the limiting groove is located at the edge of the accommodating hole and is communicated with the accommodating hole.

Preferably, the number of the limiting blocks is two, and the number of the limiting grooves is two, and the two limiting grooves are arranged at intervals along the first direction or the second direction and enable the permanent magnets to be located between the two limiting blocks.

Preferably, the two limiting grooves are respectively located on two opposite sides of the counterweight block along the magnetizing direction.

Compared with the prior art, the utility model discloses a linear vibration motor passes through the diapire of casing sets firmly the stopper, the stopper include with first direction vertically first striking face and with second direction vertically second striking face, and establish the confession on the balancing weight stopper male spacing groove to it is right through the stopper that sets firmly on the diapire the vibration of balancing weight carries on spacingly. The limiting structure is simple in structure, does not occupy redundant space and is convenient to assemble, and the limiting block and the bottom wall are enabled to have larger connecting area so that the limiting block is more reliable to fix.

Drawings

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

fig. 2 is an assembled perspective view of the linear vibration motor shown in fig. 1;

FIG. 3 is a sectional view of the linear vibration motor shown in FIG. 2 taken along the A-A direction;

fig. 4 is an assembled structural view of a partial structure of the linear vibration motor shown in fig. 1;

FIG. 5 is a schematic view of the structure of FIG. 4 with the stator removed;

fig. 6 is the utility model discloses the structure schematic diagram of the spacing balancing weight of stopper among the linear vibration motor.

Detailed Description

The present invention will be further explained with reference to the drawings and the embodiments.

The utility model provides a linear vibration motor 100, for the convenient description explains, establishes XYZ triaxial coordinate. As shown in fig. 1, the X-axis direction is defined as a first direction, the Y-axis direction is defined as a second direction, and the Z-axis direction is defined as a magnetizing direction, where the first direction and the second direction are two different vibration directions, the vibration of the vibrator along the third direction can be decomposed into two vibration components along the first direction and the second direction, the magnetizing direction is the thickness direction of the linear vibration motor, and the first direction, the second direction, and the magnetizing direction are perpendicular to each other.

Referring to fig. 1 to 6, a linear vibration motor 100 includes a housing 1 having an accommodating space 100A, a vibrator 2 having a weight 23, an elastic support 3 fixed to the housing 1 and suspending the vibrator 2 in the housing 1, and a stator 4 fixed to the housing 1, wherein the stator 4 drives the vibrator 2 to vibrate along a first direction (i.e., an X-axis direction), a second direction (i.e., a Y-axis direction), or a third direction, the first direction (i.e., the X-axis direction) and the second direction (i.e., the Y-axis direction) are perpendicular to each other, and the third direction is located on a plane where the first direction (i.e., the X-axis direction) and the second direction (i.e., the Y-axis direction) are located and is not parallel to both the first direction (i.e., the X-axis direction) and the second direction (i.e., the Y-axis direction).

As shown in fig. 1, 2 and 3, the housing 1 includes an upper cover plate 11, a lower cover plate 13 spaced apart from the upper cover plate 11, and a sidewall 15 disposed between the upper cover plate 11 and the lower cover plate 13, and the upper cover plate 11, the lower cover plate 13 and the sidewall 15 cooperate to form the receiving space 100A. The side wall 15 is formed by two parts arranged in a central symmetry manner, and a direction from the upper cover plate 11 to the lower cover plate 13 is a thickness direction (i.e., a Z-axis direction) of the linear vibration motor 100.

The case 1 has a bottom wall 1A opposed to the vibrator 2 and spaced apart from each other. As shown in fig. 3, the areas of the upper cover plate 11 and the lower cover plate 13 corresponding to the accommodating space 100A are the bottom walls 1A, that is, the number of the bottom walls 1A is two, and the two bottom walls 1A are respectively a first bottom wall 11A located on the upper cover plate 11 and a second bottom wall 13A located on the lower cover plate 13.

In the present embodiment, the stator 4 is fixed to both the first bottom wall 13A and the second bottom wall 13A. That is, the stator 4 is fixed to both the upper cover plate 11 and the lower cover plate 13. This can increase the driving force of the stator 4 to the vibrator 2, and thus can effectively improve the vibration performance. It is understood that, in other embodiments, the stator 4 may be fixed to only one of the first bottom wall 13A and the second bottom wall.

The oscillator 2 comprises permanent magnets 21 opposite to the stator 4 and arranged at intervals and a balancing weight 23 connected with the elastic support piece 3 and provided with accommodating holes 23A for accommodating the permanent magnets 21. Specifically, the permanent magnet 21 is accommodated in the accommodating hole 23A and fixed, the elastic support member 3 is connected to the weight block 23, and the vibrator 2 is suspended in the accommodating space 100A by being fixed to the weight block 23.

The permanent magnet 21 is made of magnetic steel. The permanent magnet 21 includes a first magnetic part 211 and a second magnetic part 213 with opposite magnetic poles, the magnetizing directions of the first magnetic part 211 and the second magnetic part 213 are perpendicular to the plane where the first direction (i.e., the X-axis direction) and the second direction (i.e., the Y-axis direction) are located, and the interface 215 of the first magnetic part 211 and the second magnetic part 213 is perpendicular to the third direction. The magnetizing directions of the first magnetic part 211 and the second magnetic part 213 are the thickness direction (i.e., the Z-axis direction) of the linear vibration motor 100.

The weight member 23 is used to increase the weight of the vibrator 2 and improve the vibration performance. In the present embodiment, the accommodating hole 23A penetrates the weight 23 along the magnetizing direction (i.e., the Z-axis direction).

In the present embodiment, the weight member 23 has a rectangular structure, and includes a first axial side 231 disposed along the first direction (i.e., the X-axis direction) and a second axial side 233 disposed along the second direction (i.e., the Y-axis direction).

The elastic supporting members 3 connected with the counterweight block 23 are respectively and fixedly arranged on the shell 1 corresponding to the two opposite sides of the counterweight block 23 along the second direction (i.e. the Y-axis direction). Namely, the number of the elastic supporting members 3 is two and the elastic supporting members are fixed to the side walls 13, respectively.

Specifically, elastic support 3 is including being fixed in fixed part 31 on lateral wall 13, certainly fixed part 31's relative both sides are followed first direction (X axle direction) extends the first elastic arm 33 that forms and certainly first elastic arm 33 is kept away from the one end of fixed part 31 is followed second direction (Y axle direction) extends second elastic arm 35 and the fixed arm 37 that forms in proper order, first elastic arm 32 with second elastic arm 33 all with balancing weight 23 interval sets up, fixed arm 37 is fixed in balancing weight 23 on the second axle limit 233. Wherein, the fixing portion 31 and the sidewall 13 and the fixing arm 37 and the weight 23 are welded by soldering pieces (not shown) to ensure the strength and reliability of the connection.

In this embodiment, the two elastic supporting members 3 are stacked on each other along the magnetizing direction.

In this embodiment, a damping member 5 is interposed between the elastic supporting member 3 and the weight block 23.

Specifically, the damping members 5 are provided in four and are respectively located at four corners of the weight block 23. Each of the damping members 5 abuts against the adjacent first elastic arm 33 and the adjacent second elastic arm 35 of the corresponding elastic support member 3, so as to provide damping when the weight block 23 moves in the first direction (i.e., the X-axis direction), the second direction (i.e., the Y-axis direction) or the third direction, thereby improving stability and reliability of the linear vibration motor 100 when it vibrates.

The stator 4 includes a coil 41, the coil 41 is in a racetrack shape, the coil 41 becomes a magnet after being energized, and the polarity direction of the magnet is parallel to the magnetizing direction (i.e., the Z-axis direction), so that the stator and the permanent magnet 21 interact to provide a driving force F for driving the vibrator 2, and the driving force F is perpendicular to the interface 215. As shown in fig. 5, the driving force F has driving force components Fx and Fy in the first direction (i.e., X-axis direction) and the second direction (i.e., Y-axis direction) to provide driving forces for the vibrations in the first direction (i.e., X-axis direction), the second direction (i.e., Y-axis direction) and the third direction, and when the frequency of the current (i.e., the frequency of the driving signal) is close to the resonant frequency of the linear vibration motor 100 in the first direction (i.e., X-axis direction) or the second direction (i.e., Y-axis direction), the mode in the first direction (i.e., X-axis direction) or the second direction (i.e., Y-axis direction) is excited to form a main movement direction. When the frequency of the driving signal simultaneously corresponds to the resonant frequency in the first direction (i.e., the X-axis direction) and the resonant frequency in the second direction (i.e., the Y-axis direction), the modes of the vibrator 2 in the first direction (i.e., the X-axis direction) and the second vibration (i.e., the Y-axis direction) are simultaneously excited, and at this time, the vibrator 2 vibrates in the third direction under the effect of a resultant force, that is, the vibrator 2 simultaneously has vibrations in the first direction (i.e., the X-axis direction) and the second vibration (i.e., the Y-axis direction).

In this embodiment, the long axis of the coil 41 is preferably parallel or perpendicular to the interface 215. Thus, the driving force of the stator 4 to the vibrator 2 can be increased without changing the magnitude of the current supplied to the coil 41, and the vibration performance can be effectively improved.

In this embodiment, the coil 41 is wound on the iron core 43, the stator 4 further includes a magnetic conductive sheet 45 attached to the coil 41 and away from one side of the vibrator 2, and the magnetic conductive sheet 45 is connected to the iron core 43. When the coil 41 is energized, the core 43 is magnetized by the magnetic field generated by the coil 41, and the magnetic pole direction of the core 43 is the same as the magnetic pole direction of the coil 41, so that the driving force of the stator 4 on the vibrator 2 can be increased without changing the magnitude of the current applied to the coil 41. Meanwhile, the magnetic conduction sheet 45 can further reduce magnetic leakage, so that the driving force of the stator 4 to the vibrator 2 can be improved.

As shown in fig. 1 and 4, a relief opening 451 is formed in the magnetic conductive sheet 45, and a welding lead of the coil 41 is led out from the relief opening 451 and is connected to an external power supply. Typically, the soldered leads of the coil 41 are connected to an external power source through a flexible circuit board.

In this embodiment, the position-letting hole 431 is formed by being recessed inward from the periphery of the magnetic conductive sheet 45.

In order to reduce the thickness of the linear vibration motor 100, it is designed to be thinner. In this embodiment, preferably, the stator 4 is partially located in the receiving hole 23A.

In order to limit the vibrator 2 from vibrating in the first direction (i.e., the X-axis direction), the second direction (i.e., the Y-axis direction), and the third direction, the reliability is improved. The bottom wall 1A is fixedly provided with a limiting block 6, and the balancing weight 23 is provided with a limiting groove 23B for inserting the limiting block 6. As shown in fig. 1 and fig. 3, the two limiting grooves 23B are located at the edge of the receiving hole 23A and are communicated with the receiving hole 23A, two limiting blocks 6 and two limiting grooves 23B are respectively provided, the two limiting grooves 23B are arranged at intervals along the second direction (i.e., the Y-axis direction) and enable the permanent magnet to be located between the two limiting blocks 6, and the two limiting grooves 23B are respectively located at two opposite sides of the counterweight block 56 along the magnetizing direction (i.e., the Z-axis direction). Correspondingly, the two limiting blocks 6 are respectively and fixedly arranged on the upper cover plate 11 and the lower cover plate 13.

As shown in fig. 6, the stopper 6 includes a first striking surface 61 perpendicular to the first direction (i.e., the X-axis direction) and a second striking surface 63 perpendicular to the second direction (i.e., the Y-axis direction). When the vibrator 2 vibrates in the third direction, the first impact surface 61 restricts displacement of the vibrator 2 in the first direction (i.e., X-axis direction), and the second impact surface 63 restricts displacement of the vibrator 2 in the second direction (i.e., Y-axis direction). Wherein the first impact surfaces 61 have two. When the two limiting grooves 23B are spaced apart from the accommodating hole 23A, the number of the second striking surfaces 63 is two.

Of course, in other embodiments, the two limiting grooves 23B may also be located on one side of the counterweight block 56 facing the upper cover plate 11 or the lower cover plate 13, and correspondingly, the two limiting blocks 6 are fixedly arranged on the upper cover plate 11 or the lower cover plate 13; the two limiting grooves 23B may also be arranged at intervals along the first direction (i.e., the X-axis direction).

Compared with the prior art, the utility model discloses a linear vibration motor passes through the diapire of casing sets firmly the stopper, the stopper include with first direction vertically first striking face and with second direction vertically second striking face, and establish the confession on the balancing weight stopper male spacing groove to it is right through setting firmly the stopper on the diapire the vibration of balancing weight carries on spacingly. The limiting structure is simple in structure, does not occupy redundant space and is convenient to assemble, and the limiting block and the bottom wall are enabled to have larger connecting area so that the limiting block is more reliable to fix.

The above only is the embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent processes of the present invention are used in the specification and the attached drawings, or directly or indirectly applied to other related technical fields, and the same principle is included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a linear vibration motor, includes the casing, has the oscillator of balancing weight, is fixed in the casing and will the oscillator suspension in elastic support piece in the casing and be fixed in stator in the casing, stator drive the oscillator along first direction, second direction, or third direction vibration, first direction with second direction mutually perpendicular, the third direction is located first direction with on the plane at second direction place and with first direction with the second direction is all unparallel, the casing have with the relative diapire that just the interval set up of oscillator, the diapire with first direction with the plane at second direction place is relative and the interval sets up its characterized in that: the diapire has set firmly the stopper, be equipped with the confession on the balancing weight stopper male spacing groove, wherein, the stopper include with first direction vertically first striking face and with second direction vertically second striking face.

2. The linear vibration motor of claim 1, wherein said stator is fixed to said bottom wall, said stator including a coil; the vibrator comprises permanent magnets which are opposite to the stator and are arranged at intervals, and a balancing weight which is connected with the elastic supporting piece and is provided with an accommodating hole for accommodating the permanent magnets, the permanent magnets comprise a first magnetic part and a second magnetic part with opposite magnetic poles, the magnetizing directions of the first magnetic part and the second magnetic part are perpendicular to the plane where the first direction and the second direction are located, and the interface of the first magnetic part and the second magnetic part is perpendicular to the third direction; wherein the coil interacts with the permanent magnet after being electrified to provide a driving force for driving the vibrator.

3. The linear vibration motor according to claim 2, wherein the receiving hole penetrates the weight in the magnetizing direction.

4. The linear vibration motor of claim 2, wherein the coil is wound around an iron core, the stator further includes a magnetic conductive sheet attached to a side of the coil away from the vibrator, and the magnetic conductive sheet is connected to the iron core.

5. The linear vibration motor according to claim 4, wherein the magnetic conductive plate is provided with a relief port, and a welding lead of the coil is led out from the relief port.

6. The linear vibration motor of claim 2, wherein the coil is racetrack shaped, and the long axis of the coil is parallel or perpendicular to the interface.

7. The linear vibration motor according to any one of claims 2 to 6, wherein the stator portion is inserted into the receiving hole.

8. The linear vibration motor according to claim 2 or 3, wherein the stopper groove is located at an edge of the receiving hole and communicates with the receiving hole.

9. The linear vibration motor of claim 8, wherein there are two of the stoppers and the two of the stopper grooves, and the two of the stopper grooves are spaced apart in the first direction or the second direction and allow the permanent magnet to be located between the two stoppers.

10. The linear vibration motor of claim 9, wherein two of the limiting grooves are respectively located at two opposite sides of the weight block in the magnetizing direction.

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