CN216312916U - Vibration motor - Google Patents

Abstract

The utility model discloses a vibration motor, which comprises a shell, a vibration assembly, a stator assembly and a vibration system, wherein the shell is provided with a stator core; the vibration system comprises a first vibration system and a second vibration system, wherein the first vibration system can enable the vibration assembly to reciprocate along a first vibration direction, and the second vibration system can enable the vibration assembly to reciprocate along a second vibration direction; the first vibration system comprises a first magnetic steel group and a first coil group; the second vibration system comprises two second magnetic steel groups and two second coil groups; the two second magnetic steel groups and the two second coil groups are arranged along the first vibration direction; the two second coil groups are respectively positioned at two sides of the first coil group, and the two second magnetic steel groups and the two second coil groups are respectively positioned at two sides of the first magnetic steel group. The vibration motor provided by the utility model has resonance frequencies in different directions, can effectively reduce the structural volume of the vibration motor in the non-vibration direction, and meets the design requirement of motor structure miniaturization.

Description

Vibration motor

Technical Field

The utility model relates to the technical field of electronic products. And more particularly, to a 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, it has become popular to use a vibration motor to provide tactile feedback, such as an incoming call prompt of a cellular phone, vibration feedback of a game machine, and the like. The prior art vibration motors generally include a vibration assembly and a resilient support member housed within a housing. The elastic support is used for suspending the vibration component in the shell and is used for providing restoring force for the vibration component and supporting force suspended in the space.

Generally, a vibration motor is provided with only one vibration system and has only a natural vibration function in one direction, and thus, the vibration motor of the conventional structure also has only one resonance frequency. If one application terminal is required to realize two resonant frequencies, only two vibration motors with different vibration directions can be installed in the application terminal, which inevitably causes the application terminal to have an installation space capable of accommodating the two vibration motors, and is not favorable for the great trend of the application terminal towards miniaturization.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, an object of the present invention is to provide a vibration motor capable of having resonant frequencies in different directions, and to reduce the structural volume of the vibration motor in the non-vibration direction, thereby satisfying the design requirement for miniaturization of the vibration motor.

In order to achieve the purpose, the utility model adopts the following technical scheme:

according to one aspect of the present invention, the present invention provides a vibration motor, comprising a housing, a vibration assembly accommodated in the housing, a stator assembly, and a vibration system for reciprocating the vibration assembly; the vibration assembly comprises a mass; the vibration system comprises a first vibration system and a second vibration system, wherein the first vibration system can enable the vibration assembly to reciprocate along a first vibration direction, and the second vibration system can enable the vibration assembly to reciprocate along a second vibration direction; the first vibration direction is vertical to the second vibration direction in the plane;

the first vibration system comprises a first magnetic steel group serving as a vibration assembly and positioned on the mass block, and a first coil group serving as a stator assembly and fixed in the shell and correspondingly matched with the first magnetic steel group;

the second vibration system comprises two second magnetic steel groups which are used as vibration components and positioned on the mass block, and two second coil groups which are used as stator components and fixed in the shell and are respectively correspondingly matched with the two second magnetic steel groups;

the two second magnetic steel groups and the two second coil groups are arranged along the first vibration direction; the two second coil groups are respectively positioned at two sides of the first coil group, and the two second magnetic steel groups and the two second coil groups are respectively positioned at two sides of the first magnetic steel group.

In addition, preferably, the first magnetic steel group comprises two first magnetic steels arranged along a first vibration direction; the magnetizing directions of the first magnetic steels are parallel to the axis of the first coil group, and the magnetizing directions of the two first magnetic steels are opposite;

the second magnetic steel group comprises two second magnetic steels arranged along a second vibration direction; the magnetizing directions of the second magnetic steels are parallel to the axis of the second coil group, and the magnetizing directions of the two second magnetic steels are opposite.

In addition, preferably, the first coil group comprises two first coils arranged along the non-vibration direction of the vibration component, and the two first coils are respectively positioned on two sides of the vibration component; the second coil group comprises two second coils which are arranged along the non-vibration direction of the vibration component, and the two second coils are respectively positioned on two sides of the vibration component.

Furthermore, it is preferred that at least two resilient supports are included within the housing for suspending the vibration assembly within the housing; the two elastic supporting pieces are centrosymmetric about the vibration assembly;

the elastic supporting piece comprises a first elastic arm and a second elastic arm, one end of the first elastic arm is fixed with the shell, and the other end of the second elastic arm is fixed with the vibration assembly; the other end of the first elastic arm is connected with the other end of the second elastic arm through an arc-shaped connecting arm.

Furthermore, it is preferable that the housing includes two opposite first side walls extending in the first vibration direction, and two opposite second side walls extending in the second direction; the vibration assembly comprises a first side surface close to the first side wall and a second side surface close to the second side wall;

the shell comprises four elastic supporting pieces which are respectively positioned at four corners of the vibration component and used for suspending the vibration component in the shell;

the elastic supporting piece comprises a first elastic arm and a second elastic arm, wherein one end of the first elastic arm is fixed with the first side wall, and one end of the second elastic arm is fixed with the first side wall; the other end of the first elastic arm is connected with the other end of the second elastic arm through an arc-shaped connecting arm;

the first elastic arms and the second elastic arms of the four elastic supporting pieces are alternately arranged along the circumferential direction of the vibration assembly.

Furthermore, it is preferable that the four elastic supporting members are located in the same plane.

Further, it is preferable that, of the two adjacent elastic support members, the first elastic arm of one elastic support member and the second elastic arm of the other elastic support member include portions overlapping each other in one vibration direction of the vibration assembly.

Furthermore, it is preferable that the elastic supports at two opposite corners of the vibration module are centrally symmetrical with respect to the vibration module.

In addition, it is preferable that a vibration gap space is included between portions where the first resilient arm of one resilient support and the second resilient arm of the other resilient support overlap each other.

In addition, it is preferable that, in the two adjacent elastic supporting members, an elastic acting portion of a first elastic arm of one elastic supporting member located on the same side of the vibration assembly and an elastic acting portion of a second elastic arm of the other elastic supporting member are arranged in parallel.

In addition, preferably, the vibration motor further includes a magnetic conductive plate, and the first coil group and the second coil group are fixedly combined with the housing through the magnetic conductive plate;

the magnetic conduction plate comprises a guide edge which avoids a coil lead and guides the coil lead.

The utility model has the following beneficial effects:

the vibration motor provided by the utility model comprises two sets of vibration systems, the vibration assembly has vibration functions in two mutually independent vibration directions, so that the motor has resonance frequencies in two different directions, the two sets of vibration systems can also simultaneously generate driving force, and the vibration assembly can generate vibration in each direction in a plane formed by a first direction and a second direction. The two second vibration systems can provide two symmetrical driving forces in the non-vibration direction of the motor, so that the stability of the motor in the vibration process is improved, and the vibration sense of the motor is increased. On the other hand, the utility model also improves the positions and the matching mode of the elastic supporting piece and the vibration component in the motor structure, thereby further effectively reducing the overall structure size of the vibration motor in the vibration direction and the non-vibration direction of the motor, meeting the miniaturization design requirement of the motor and being suitable for the great trend of the application terminal towards the miniaturization direction.

Drawings

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

Fig. 1 shows a schematic view of an assembly of a vibration motor provided by the present invention.

Fig. 2 shows an assembly view of a mass block, a magnetic circuit assembly, and a coil assembly in a structure of a vibration motor provided by the present invention.

Fig. 3 shows a schematic diagram of the mass block, the magnetic circuit assembly and the coil assembly in the vibration motor structure provided by the present invention.

Fig. 4 shows an assembly view of the upper case, the elastic support member, and the mass in the structure of the vibration motor provided by the present invention.

Fig. 5 is a schematic view illustrating a combined structure of the upper case, the elastic supporting member and the mass in the vibration motor structure according to the present invention.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the utility model, its application, or uses.

Techniques and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be considered a part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In order to overcome the problems in the prior art, an embodiment of the present invention provides a vibration motor, which is shown in fig. 1 to 5, and in particular, a vibration motor, which includes a housing 1, where the housing 1 includes an upper shell 11 with an opening on one side and a bottom cover 12 covering the opening and enclosing an accommodating space with the upper shell; the vibration component, the stator component and the vibration system which can make the vibration component reciprocate are accommodated in the shell 1. The vibration assembly comprises a mass 2 and the stator assembly comprises a coil assembly 4 fixed within a housing 1. Optionally, the casing 1 is made of a material with magnetic conductivity, and a closed magnetic conduction casing is adopted, so that magnetic leakage of the motor structure can be reduced, and the magnetic field utilization rate and the driving force of the magnetic group structure can be improved.

The vibration system comprises a first vibration system and a second vibration system, wherein the first vibration system can enable the vibration assembly to reciprocate along a first vibration direction, and the second vibration system can enable the vibration assembly to reciprocate along a second vibration direction; the first vibration direction is perpendicular to the second vibration direction within the plane. Wherein the first vibration direction is an X direction shown in fig. 1, the second vibration direction is a Y direction shown in fig. 1, and the Z direction is a non-vibration direction perpendicular to both the first vibration direction and the second vibration direction.

In the motor structure provided by the present invention, as shown in fig. 1, fig. 2 and fig. 3, the first vibration system includes a first magnetic steel set 31 located on the mass block 2 as a vibration component, and a first coil set 41 fixed in the housing 1 as a stator component and correspondingly matched with the first magnetic steel set 31. The second vibration system includes two second magnetic steel groups 32 located on the mass block 2 as a vibration assembly, and two second coil groups 42 fixed in the housing 1 as a stator assembly and respectively corresponding to and matching with the two second magnetic steel groups 32. The driving force generated by the first magnetic steel group 31 and the first coil group 41 enables the motor to vibrate along a first vibration direction; the driving force generated by the second magnetic steel set 32 and the second coil set 42 makes the motor vibrate along the second vibration direction. Specifically, when the first coil group 41 is energized, the vibration assembly vibrates in the first vibration direction, i.e., the X direction, has one resonance frequency, and brings a corresponding vibration sensation. When the second coil assembly 42 is energized, the vibration assembly vibrates in a second vibration direction, the Y-direction, having another resonant frequency and imparting a corresponding vibration sensation. The motor provided by the embodiment can provide double-frequency resonance in X and Y directions by providing one vibration assembly. When first coil assembly and second coil assembly switched on simultaneously, the motor worked with two resonant frequency simultaneously, and at this moment, there was the sense of vibration of X direction also had the sense of vibration of Y direction, and each other does not influence, realizes better vibration effect. In one embodiment, the first magnetic steel set 31 and the two second magnetic steel sets 32 are accommodated in the fixed mass block to provide more vibration space for the vibration assembly, and optionally, in order to fully utilize magnetic lines of force of the magnetic steel, both the first magnetic steel set 31 and the second magnetic steel set 32 are exposed from the upper and lower side surfaces of the mass block 2.

Compared with the vibration system of the existing vibration motor, the motor structure provided by the present embodiment includes two second coil groups 42 and two second magnetic steel groups 32 arranged along the first vibration direction; the two second coil groups 42 are respectively located at two sides of the first coil group 41, and the two second magnetic steel groups 32 and the two second coil groups 42 are respectively located at two sides of the first magnetic steel group 31. The two second coil groups 42 and the two second magnetic steel groups 32 can provide two symmetrical driving forces relative to the first coil group 41 in the second vibration direction, so that the motor can obtain better vibration stability in the second vibration direction.

In one embodiment, referring to fig. 2 and 3 in combination, the first coil set 41 includes two first coils arranged along a non-vibration direction, i.e., a Z direction, of the vibration assembly, and the two first coils are respectively located at two sides of the vibration assembly; the second coil assembly 42 includes two second coils arranged along a non-vibration direction of the vibration assembly, i.e., a Z direction, and the two second coils are respectively located at two sides of the vibration assembly. Move the first coil of setting up respectively of subassembly both sides and second coil can provide the drive power of two symmetries in the non-vibration direction of motor, improve the stability of motor vibration in-process, and increase the motor and shake the sense.

In one embodiment, the first magnetic steel set 31 includes two first magnetic steels arranged along the first vibration direction; the magnetizing directions of the first magnetic steels are parallel to the axis of the first coil group 41, and the magnetizing directions of the two first magnetic steels are opposite; the second magnetic steel group 32 comprises two second magnetic steels arranged along a second vibration direction; the magnetizing directions of the second magnetic steels are parallel to the axes of the second coil group 42, and the magnetizing directions of the two second magnetic steels are opposite.

The vibration motor provided by the utility model comprises two sets of vibration systems, the vibration assembly has vibration functions in two mutually independent vibration directions, so that the motor has resonance frequencies in two different directions, the two sets of vibration systems can also simultaneously generate driving force, and the vibration assembly can generate vibration in each direction in a plane formed by a first direction and a second direction. The two second vibration systems can provide two symmetrical driving forces in the non-vibration direction of the motor, so that the stability of the motor in the vibration process is improved, and the vibration sense of the motor is increased.

Referring to fig. 1, 4 and 5 in combination, in the motor structure provided by the present invention, the housing 1 includes two opposite first side walls 111 extending along the first vibration direction, and two opposite second side walls 112 extending along the second direction; the vibration assembly includes a first side adjacent to the first sidewall 111 and a second side adjacent to the second sidewall 112. With the illustrated structure, in the present embodiment, two opposing first side walls 111 and two opposing second side walls 112 are formed on the upper case 11, and the magnetic circuit element is accommodated in the mass block 2, so that one opposing outer side wall surface of the mass block 2 forms the first side surface 211 of the vibration element, and the other opposing outer side wall surface of the mass block 2 forms the second side surface 212 of the vibration element. The housing 1 includes four resilient supports 5 at four corners of the vibration assembly for suspending the vibration assembly within the housing 1.

The elastic support 5 comprises a first elastic arm with one end fixed with the first side wall 111 and a second elastic arm with one end fixed with the first side surface 211; the other end of the first elastic arm is connected with the other end of the second elastic arm through an arc-shaped connecting arm. The first elastic arms and the second elastic arms of the four elastic supporting pieces are alternately arranged along the circumferential direction of the vibration assembly. For convenience of detailed description, the four elastic supports include, in particular, a first elastic support 51, a second elastic support 52, a third elastic support 53, and a fourth elastic support 54. When the vibration assembly vibrates in the first vibration direction (i.e., the X direction), the second elastic arms 522 and 542 of the second and fourth elastic supports 52 and 54 provide elastic force and restoring force to the vibration assembly. When the vibration assembly vibrates in the second vibration direction (i.e., the Y direction), the second elastic arms 512 of the first elastic support 51 and the second elastic arms 532 of the third elastic support 53 provide elastic force and restoring force for the vibration assembly.

In the present embodiment, the vibration unit has a vibration function in two mutually independent vibration directions, and the motor has two resonance frequencies in different directions, or a first vibration direction and a second vibration direction which are mutually independent, and the two sets of vibration systems simultaneously generate driving forces, and the vibration unit can generate vibrations in each direction in a plane formed by the first direction and the second direction. Four elastic support piece can be independent emergence deformation, produce the rebound force in first vibration direction or the second vibration direction to according to the vibration of vibration subassembly, provide independent elastic restoring force weight in first vibration direction and second vibration direction, realize the multi-directional function of vibration of motor.

Optionally, by adjusting the thickness of the elastic supporting parts, the height in the Z direction, the bending angle of the arc-shaped connecting arm, and the shapes of the first elastic arm and the second elastic arm, the stiffness of each elastic supporting part can be adjusted, further the stiffness components of any one of the four elastic supporting parts in the first vibration direction and the second vibration direction are independently controlled, and the vibration frequency and the mode of the vibration assembly in the first vibration direction and the second vibration direction are independently adjusted. Further realize the adjustment of the multi-directional vibration frequency and mode of the motor.

In one embodiment, four of the resilient supports 5 are located in the same plane. Therefore, the whole thickness of the motor can be effectively reduced in the non-vibration direction of the motor, namely the Z direction under the condition that the vibration inductance of the motor is not influenced, and the miniaturization design requirement of the motor is met.

As shown in fig. 4 and 5, in one embodiment, the first elastic arm of one elastic supporting member and the second elastic arm of the other elastic supporting member in two adjacent elastic supporting members include portions overlapping each other in one vibration direction of the vibration assembly. Specifically, as shown in the drawing, in the present embodiment, the motor includes a long axis side in the X direction and a short axis side in the Y direction, wherein the first elastic arm 511 of the first elastic support 51 and the second elastic arm 522 of the second elastic support 52 include portions overlapping each other in the first vibration direction, and the first elastic arm 531 of the third elastic support 53 and the second elastic arm 542 of the fourth elastic support 54 include portions overlapping each other in the first vibration direction, and the structural size of the motor in the Y direction can be effectively reduced by the above design. In other embodiments, optionally, by reducing the structural size of the motor in the X direction, even if the second elastic arm of the first elastic support and the first elastic arm of the fourth elastic support include mutually overlapped portions in the second vibration direction, the first elastic arm of the second elastic support and the second elastic arm of the fourth elastic support include mutually overlapped portions in the second vibration direction, so as to meet the requirement of further miniaturization of the overall structure of the motor. Further, in order to avoid noise caused by collision between the elastic arms of the two elastic supporting pieces or mutual interference to influence the vibration effect of the motor, a vibration interval space is included between the overlapped parts of the first elastic arm of one elastic supporting piece and the second elastic arm of the other elastic supporting piece. Preferably, a damping member is included between the overlapping portions of the two elastic arms.

In order to ensure that the vibrating assembly is balanced during vibration without polarization, the elastic supports at two opposite corners of the vibrating assembly are centrosymmetric with respect to the vibrating assembly. Two opposite corners of the vibration component refer to two corners on the diagonal of the vibration component, so that the vibration stability of the vibration component is improved. With the illustrated structure, the first elastic supporting member 51 and the third elastic supporting member 53 are symmetric with respect to the vibration assembly, and the second elastic supporting member 52 and the fourth elastic supporting member 54 are symmetric with respect to the vibration assembly. Optionally, in two adjacent elastic supporting members, an elastic action portion of a first elastic arm of one elastic supporting member located on the same side of the vibration assembly and an elastic action portion of a second elastic arm of the other elastic supporting member are arranged in parallel, and a damping member may be disposed to increase stability of the elastic supporting members, reduce risk of breakage and damage due to uneven stress of the elastic arms of the elastic supporting members, and ensure that the motor can obtain a stable vibration effect.

Referring to fig. 1, the vibration motor provided in this embodiment further includes a magnetic conductive plate, and the first coil group 41 and the second coil group 42 are fixed to the housing 1 through the magnetic conductive plate 6; the motor shell 1 and the magnetic conduction plate 3 jointly form a closed loop, and through the matching with the magnetic circuit assembly 3, after the coil assembly 4 is electrified, the ampere force provides the driving power required by the motor vibration. The magnetic conduction plate 6 is made of a magnetic conduction material, can play a role of magnetic conduction, is used for correcting the shape of the magnetic induction line of the magnetic steel and enhancing the magnetic induction intensity at the coil, avoids the outward scattering of the magnetic induction line, increases the magnetic flux of the coil, enhances the Lorentz force, and effectively increases the vibration force and the vibration effect of the vibration assembly. The magnetic conduction plate 6 comprises a guide edge 63 which avoids a coil lead and guides the coil lead. Specifically, the magnetic conductive plate 6 includes at least a first structure portion 61 corresponding to the first coil acting portion, and a second structure portion 62 corresponding to the second coil acting portion. As shown in the drawings provided by the present invention, the magnetic conductive plate 6 includes two U-shaped structural plates arranged in mirror symmetry, one plate wall of the U-shaped structural plate forms a first structural portion 61 corresponding to the first coil action portion, and the other two plate walls form a second structural portion 62 corresponding to the second coil action portion. The U-shaped structural plate comprises a coil lead wire used for avoiding the coil lead wire and a bevel edge which is used for leading out the coil lead wire and has a guiding function when being connected with the flexible circuit board, and the bevel edge forms a guiding edge 63. Compared with the traditional magnetic conduction plate with a roughly rectangular structure, the coil lead is not fixed on the magnetic conduction plate any longer, and is not led out through the magnetic conduction plate any longer.

Further, the vibration motor further comprises a flexible circuit board 7, the coil assembly 4 is conducted with an external circuit through the flexible circuit board 7, and the flexible circuit board 7 comprises a pad electrically connected with the external circuit.

As can be seen from the above description, the vibration motor provided by the present invention has two sets of vibration systems, and can generate vibration functions in two mutually independent vibration directions, and also can simultaneously generate driving forces, and the vibration assembly can generate vibration in each direction in a plane formed by the first direction and the second direction. The two second vibration systems can provide two symmetrical driving forces in the non-vibration direction of the motor, so that the stability of the motor in the vibration process is improved, and the vibration sense of the motor is increased. In addition, the utility model also improves the positions and the matching mode of the elastic supporting piece and the vibration component in the motor structure, thereby further effectively reducing the overall structure size of the vibration motor in the vibration direction and the non-vibration direction of the motor so as to adapt to the design development trend of small volume and large vibration sense of the vibration motor.

It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.

Claims (10)

1. A vibration motor comprises a shell, a vibration component, a stator component and a vibration system, wherein the vibration component, the stator component and the vibration system are accommodated in the shell; the vibration assembly comprises a mass; the vibration system is characterized by comprising a first vibration system and a second vibration system, wherein the first vibration system can enable the vibration assembly to reciprocate along a first vibration direction, and the second vibration system can enable the vibration assembly to reciprocate along a second vibration direction; the first vibration direction is vertical to the second vibration direction in the plane;

the first vibration system comprises a first magnetic steel group serving as a vibration assembly and positioned on the mass block, and a first coil group serving as a stator assembly and fixed in the shell and correspondingly matched with the first magnetic steel group;

the second vibration system comprises two second magnetic steel groups which are used as vibration components and positioned on the mass block, and two second coil groups which are used as stator components and fixed in the shell and are respectively correspondingly matched with the two second magnetic steel groups;

the two second magnetic steel groups and the two second coil groups are arranged along the first vibration direction; the two second coil groups are respectively positioned at two sides of the first coil group, and the two second magnetic steel groups and the two second coil groups are respectively positioned at two sides of the first magnetic steel group.

2. The vibration motor of claim 1, wherein the first magnetic steel group includes two first magnetic steels arranged in a first vibration direction; the magnetizing directions of the first magnetic steels are parallel to the axis of the first coil group, and the magnetizing directions of the two first magnetic steels are opposite;

the second magnetic steel group comprises two second magnetic steels arranged along a second vibration direction; the magnetizing directions of the second magnetic steels are parallel to the axis of the second coil group, and the magnetizing directions of the two second magnetic steels are opposite.

3. The vibration motor of claim 1, wherein the first coil group includes two first coils arranged in a non-vibration direction of the vibration assembly, the two first coils being respectively located at both sides of the vibration assembly; the second coil group comprises two second coils which are arranged along the non-vibration direction of the vibration component, and the two second coils are respectively positioned on two sides of the vibration component.

4. The vibration motor of claim 1, wherein the housing includes two opposite first side walls extending in the first vibration direction and two opposite second side walls extending in the second direction; the vibration assembly comprises a first side surface close to the first side wall and a second side surface close to the second side wall;

the shell comprises four elastic supporting pieces which are respectively positioned at four corners of the vibration component and used for suspending the vibration component in the shell;

the elastic supporting piece comprises a first elastic arm and a second elastic arm, wherein one end of the first elastic arm is fixed with the first side wall, and one end of the second elastic arm is fixed with the first side wall; the other end of the first elastic arm is connected with the other end of the second elastic arm through an arc-shaped connecting arm;

the first elastic arms and the second elastic arms of the four elastic supporting pieces are alternately arranged along the circumferential direction of the vibration assembly.

5. A vibration motor according to claim 4, wherein the four elastic supporting members are located in the same plane.

6. A vibration motor according to claim 4, wherein the first elastic arm of one of the two adjacent elastic support members and the second elastic arm of the other elastic support member include portions overlapping each other in one vibration direction of the vibration assembly.

7. A vibratory motor as set forth in claim 4 wherein said resilient supports at opposite corners of said vibratory assembly are centrally symmetric about said vibratory assembly.

8. The vibration motor of claim 6, wherein a vibration interval space is included between portions where the first elastic arm of one elastic support member and the second elastic arm of the other elastic support member overlap each other.

9. The vibration motor of claim 4, wherein the elastic operation portion of the first elastic arm of one of the two adjacent elastic support members located on the same side of the vibration assembly is arranged in parallel with the elastic operation portion of the second elastic arm of the other elastic support member.

10. The vibration motor according to claim 1, further comprising a magnetic conductive plate, wherein the first coil assembly and the second coil assembly are fixed to the housing by the magnetic conductive plate;

the magnetic conduction plate comprises a guide edge which avoids a coil lead and guides the coil lead.

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