WO2022067927A1

WO2022067927A1 - Vibration motor

Info

Publication number: WO2022067927A1
Application number: PCT/CN2020/124236
Authority: WO
Inventors: 马杰
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声科技(新加坡)有限公司
Priority date: 2020-09-29
Filing date: 2020-10-28
Publication date: 2022-04-07
Also published as: CN213461491U

Abstract

A vibration motor (10). The vibration motor (10) comprises a housing (100) having an accommodating space (101), and a vibrator assembly (200) and a stator assembly (300) which are accommodated in the accommodating space (101). The vibrator assembly (200) comprises a rigid member (210), a first elastic member (220), and a vibrator unit (230); the vibrator unit (230) is fixedly provided on the rigid member (210) by means of the first elastic member (220) and can vibrate back and forth in a first direction. The vibration motor (10) further comprises a second elastic member (500). The vibrator assembly (200) can vibrate back and forth in a second direction. The first elastic member (220) is used to connect the vibrator unit (230) to the rigid member (210), and the second elastic member (500) is used to connect the vibrator assembly (200) having the vibrator unit (230) to the housing (100), so that the first elastic member (220) and the second elastic member (500) are mutually decoupled and do not affect each other, and can provide restoring force of reciprocating vibration respectively in the first direction and the second direction. The restoring force from two directions is prevented from being provided by the same elastic member, it is guaranteed that the stress borne by the first elastic member (220) and the second elastic member (500) is small, and therefore high reliability is achieved after long-time use.

Description

vibration motor

technical field

The present application relates to the technical field of electromagnetic motion, and in particular, to a vibration motor.

Background technique

The vibrator in the traditional vibration motor provides support and restoring force through the spring. For the vibrator that vibrates in two directions, the spring needs to provide restoring force in two directions. This results in an increase in manufacturing cost. At the same time, the spring needs to take into account the vibrator vibrating in two directions. After a long time of use, the direction of the restoring force provided by the spring to the vibrator will deviate from the preset direction, resulting in a decrease in the performance of the vibration motor.

technical problem

Therefore, it is necessary to provide a vibration motor.

technical solutions

The purpose of the present application is to provide a vibration motor to solve the problem that the direction of the restoring force provided to the vibrator is biased due to the long-term use of the spring in the traditional vibration motor, especially the vibration motor with the vibrator that can vibrate in two directions. technical issues of direction.

To achieve the above object, the technical scheme of the application is as follows:

A vibration motor includes a housing with an accommodation space, a vibrator assembly and a stator assembly accommodated in the accommodation space, the stator assembly is fixed on the casing and is relatively spaced from the vibrator assembly, the The vibrator assembly includes a rigid part, a first elastic part and a vibrator unit, the first elastic part is located between the rigid part and the vibrator unit, and the vibrator unit is fixed to the rigid part through the first elastic part and can vibrate back and forth in a first direction, the first elastic member can provide a first restoring force for the vibrator unit to vibrate back and forth in the first direction, the vibration motor further includes a second elastic member, the The housing and the rigid member are connected by the second elastic member to suspend the vibrator assembly in the receiving space, the vibrator assembly can vibrate reciprocally in the second direction, and the second elastic member can be The vibrator assembly provides a second restoring force for reciprocating vibration along the second direction, and the first direction and the second direction are perpendicular.

In some embodiments of the vibration motor, the stiffness of the first elastic member in the first direction is smaller than the stiffness of the second elastic member in the second direction.

In some embodiments of the vibration motor, the modal frequency of the vibrator unit along the first direction is less than or equal to the modal frequency of the vibrator assembly along the second direction.

In some embodiments of the vibration motor, the number of the first elastic members is two, and the two first elastic members are respectively disposed on both sides of the vibrator unit along the first direction. The number of the second elastic members is two, and the two second elastic members are respectively disposed on both sides of the vibrator assembly along the second direction.

In some embodiments of the vibration motor, the rigid member includes two first connecting parts oppositely disposed along the second direction and a second connecting part connected between the two first connecting parts, The second connecting portion is used to maintain the rigidity and stability of the rigid member, and each of the first elastic members is disposed on both sides of the same first connecting portion in a one-to-one correspondence with each of the second elastic members.

In some embodiments of the vibration motor, the rigid member is an annular member and is arranged around the vibrator unit.

In some embodiments of the vibration motor, the first elastic member is C-shaped, and the first elastic member includes a first end connected to the first connection portion and a second end connected to the vibrator unit end.

In some embodiments of the vibration motor, the second elastic member is V-shaped, and the second elastic member includes a third end connected with the first connection portion and a fourth end connected with the housing end.

In some embodiments of the vibration motor, a damping member is connected between the first elastic member and the vibrator unit.

In some embodiments of the vibration motor, two stoppers are further accommodated in the receiving space, and the two stoppers are oppositely disposed along the first direction and correspond to two ends of the vibrator unit one-to-one. , the vibrator unit is provided with an avoidance groove for avoiding the stopper.

In some embodiments of the vibration motor, the number of the stator assemblies is two, and the two stator assemblies are oppositely disposed along a third direction and located on both sides of the vibrator assembly, and the vibration motor further includes a circuit The circuit board is used for delivering electrical energy to the stator assembly, so that the stator assembly can generate a magnetic field, and the third direction is perpendicular to the plane where the first direction and the second direction are located.

beneficial effect

The beneficial effects of this application are:

The above-mentioned vibration motor adopts the first elastic member to connect the vibrator unit and the rigid member, and uses the second elastic member to connect the vibrator assembly with the vibrator unit to the housing, so that the first elastic member and the second elastic member are decoupled from each other and are not connected to each other. Influence, and can provide the restoring force of reciprocating vibration in the first direction and the second direction respectively, avoid the restoring force from the two directions being provided by the same elastic member, and ensure the stress on the first elastic member and the second elastic member. Smaller, so it still has high reliability after long-term use.

Description of drawings

FIG. 1 is a schematic diagram of the spatial structure of a vibration motor according to an embodiment of the present application;

Fig. 2 is the exploded schematic diagram of the vibration motor shown in Fig. 1;

FIG. 3 is a front view of the vibration motor shown in FIG. 1 after removing the upper cover;

FIG. 4 is a front view of the vibration motor shown in FIG. 1 with the lower cover removed.

Embodiments of the present invention

The present application will be further described below with reference to the accompanying drawings and embodiments.

Please refer to FIG. 1 to FIG. 4 together to describe the vibration motor 10 provided by the present application. The vibration motor 10 includes a housing 100 , a vibrator assembly 200 , a stator assembly 300 and a circuit board 400 . The casing 100 has a receiving space 101 . Specifically, the housing 100 includes an upper cover 110 and a lower cover 120 disposed opposite to each other, and a circumferential side wall 130 located between the upper cover 110 and the lower cover 120 . The upper cover 110 , the lower cover 120 and the circumferential side wall 130 are surrounded to form a receiving space 101 . In this embodiment, the upper cover 110 and the circumferential side wall 130 may be integrated into one body by means of clamping, bonding or ultrasonic welding. Similarly, the circumferential side wall 130 and the lower cover 120 can also be connected as a whole by means of clipping, bonding or ultrasonic welding.

Further, the vibrator assembly 200 and the stator assembly 300 are accommodated in the accommodating space 101 , and the stator assembly 300 is fixed to the casing 100 and is disposed opposite to the vibrator assembly 200 at a distance. In this embodiment, the number of stator assemblies 300 is two, and the two stator assemblies 300 are disposed opposite to each other along the third direction and located on both sides of the vibrator assembly 200 . Specifically, the stator assembly 300 includes a voice coil 310 , a pole core 320 and a magnetic conductive sheet 330 . The voice coil 310 is disposed in the circumferential direction of the pole core 320 . One end of the pole core 320 is fixed on the casing 100 through the magnetic conductive sheet 330 . Specifically, the two magnetic conductive sheets 330 are respectively fixed on the upper cover 110 and the lower cover 120 , so that the two voice coils 310 are disposed opposite to each other and located on both sides of the vibrator assembly 200 . In this embodiment, the circuit board 400 is used to transmit electrical energy to the stator assembly 300 so that the stator assembly 300 can generate a magnetic field. Specifically, the circuit board 400 is attached to the side of the lower cover 120 close to the circumferential side wall 130 and is electrically connected to the voice coil 310 close to the lower cover 120 through the circumferential side wall 130, so that the voice coil 310 is energized and generated magnetic field. The circuit board 400 is provided with a branch circuit 410 , one end of the branch circuit 410 passes through the circumferential side wall 130 and is attached to the upper cover 110 and is electrically connected to the voice coil 310 close to the upper cover 110 , so that the voice coil 310 is powered and generate a magnetic field.

Further, the vibrator assembly 200 includes a rigid member 210 , a first elastic member 220 and a vibrator unit 230 . The first elastic member 220 is located between the rigid member 210 and the vibrator unit 230. The vibrator unit 230 is fixed to the rigid member 210 through the first elastic member 220 and can vibrate back and forth in the first direction. The first elastic member 220 can be the vibrator unit 230. To provide a first restoring force for reciprocating vibration along the first direction, the vibration motor 10 further includes a second elastic member 500 , and the housing 100 and the rigid member 210 are connected through the second elastic member 500 to suspend the vibrator assembly 200 in the receiving space 101 , the vibrator assembly 200 can vibrate back and forth in the second direction, and the second elastic member 500 can provide the vibrator assembly 200 with a second restoring force that vibrates back and forth in the second direction. The above vibration motor 10 uses the first elastic member 220 to connect the vibrator unit 230 to the rigid member 210, and uses the second elastic member 500 to connect the vibrator assembly 200 with the vibrator unit 230 to the housing 100, so that the first elastic member 220 and the second elastic member 500 are connected. The two elastic members 500 are decoupled from each other and do not affect each other, and can respectively provide the restoring force of the reciprocating vibration in the first direction and the second direction, avoiding the restoring force from the two directions being provided by the same elastic member, and ensuring the first The elastic member 220 and the second elastic member 500 are less stressed, so that they still have high reliability after long-term use.

Further, the vibrator unit 230 includes a magnetic steel 231 and a counterweight 232 arranged around the magnetic steel 231 . The magnetic field generated by the voice coil 310 interacts with the magnetic field generated by the magnetic steel 231 , thereby driving the vibrator assembly 200 to vibrate back and forth in the first direction and in the second direction in the receiving space 101 . In this embodiment, the first direction is perpendicular to the second direction, and the third direction is perpendicular to the plane where the first direction and the second direction are located. The first direction is parallel to the direction indicated by arrow X in FIG. 2 , the second direction is parallel to the direction indicated by arrow Y in FIG. 2 , and the third direction is the direction indicated by arrow Z in FIG. 2 .

Further, since the first elastic member 220 can provide the vibrator unit 230 with a first restoring force for reciprocating vibration along the first direction, the stiffness of the first elastic member 220 along the first direction needs to be smaller than that of the first elastic member 220 along the first direction. The stiffness in the two directions ensures that the first elastic member 220 can provide the vibrator unit 230 with a first restoring force for reciprocating vibration along the first direction. Similarly, since the second elastic member 500 can provide the vibrator assembly 200 with a second restoring force for reciprocating vibration along the second direction, the stiffness of the second elastic member 500 along the second direction needs to be smaller than that of the second elastic member 500 along the second direction. The stiffness in one direction ensures that the second elastic member 500 can provide the vibrator assembly 200 with a second restoring force for reciprocating vibration in the second direction.

Further, the stiffness of the first elastic member 220 in the first direction is smaller than the stiffness of the second elastic member 500 in the second direction. In this embodiment, the second elastic member 500 is connected to the vibrator unit 230 through the rigid member 210 and the first elastic member 220 in sequence, and in order to ensure that the first elastic member 220 can stably provide the first restoring force, the first elastic member 220 A certain amount of deformation can be achieved stably. Therefore, the stiffness of the first elastic member 220 in the first direction is smaller than the stiffness of the second elastic member 500 in the second direction, which can ensure that the first elastic member 220 is in a relatively stable and rigid environment. In order to ensure that it can stably reach a certain amount of deformation. Further, the modal frequency of the vibrator unit 230 along the first direction is less than or equal to the modal frequency of the vibrator assembly 200 along the second direction, which ensures that the vibration motor 10 has a bidirectional vibration frequency. Meanwhile, due to the above arrangement, the modal frequencies of the stator assembly 300 in other directions other than the first direction and the second direction are relatively high, which prevents the stator assembly 300 from swaying during the use of the vibration motor 10 .

Further, the number of the first elastic members 220 is two, the two first elastic members 220 are respectively disposed on both sides of the vibrator unit 230 along the first direction, the number of the second elastic members 500 is two, and the two second elastic members 220 are respectively arranged on both sides of the vibrator unit 230 along the first direction The elastic members 500 are respectively disposed on both sides of the vibrator assembly 200 along the second direction to further ensure the vibration stability of the vibrator unit 230 and the vibrator assembly 200 .

Specifically, the first elastic member 220 is C-shaped, and the first elastic member 220 includes a first end 2201 connected with the rigid member 210 and a second end 2202 connected with the vibrator unit 230 . The mouths of the two first elastic members 220 are disposed opposite to each other, and the two first elastic members 220 correspond to opposite ends of the vibrator unit 230 along the first direction and pass through the second end 2202 and the counterweight 232 . The first elastic members 220 are simultaneously disposed on both sides of the vibrator unit 230 to ensure the stability of the vibrator unit 230 vibrating in the first direction.

Further, the first elastic member 220 includes a first branch 221 , a second branch 222 and a third branch 223 . The first branch 221 and the third branch 223 are disposed opposite to each other along the second direction and are located on both sides of the vibrator unit 230 respectively. The branch 223 is bent to form a first bent portion 224 and is connected to one end of the second branch 222 , the second end 2202 is located on the third branch 223 , and an end of the third branch 223 away from the second end 2202 is directed toward the first branch 221 Bending to form the second bending part 225 and connecting with the other end of the second branch 222 .

Further, a damping member 600 is connected between the first elastic member 220 and the vibrator unit 230 . The two damping members 600 are disposed opposite to each other along the first direction, and their opposite sides along the first direction are in contact with the second branch 222 and the counterweight 232 respectively, so as to ensure that when the vibrator unit 230 vibrates in the first direction, the damping members 600 Damping of the vibrator unit 230 can be provided.

Further, two stoppers 700 are also accommodated in the accommodation space 101 . The stopper 700 is fixedly connected with the lower cover 120 . Further, the two stoppers 700 are disposed opposite to each other along the first direction and correspond to two ends of the vibrator unit 230 one-to-one. The vibrator unit 230 is provided with an escape groove 2321 for avoiding the stopper 700 . In this embodiment, the avoidance groove 2321 is located on the counterweight block 232 and is spaced from the stopper 700 . During the vibration process, the stopper 700 blocks the counterweight block 232 to effectively prevent the first elastic piece 220 from being deformed. large performance degradation. At the same time, the second branch 222 is provided with an arc-shaped notch 2221 , and the arc-shaped notch 2221 is used to avoid the stopper 700 . In order to ensure force balance, the number of arc-shaped notches 2221 is two, and they are located on opposite sides of the second branch 222 respectively.

Further, a first washer 226 is provided on a side of the first end 2201 close to the counterweight 232 and a side of the second end 2202 close to the rigid member 210 . The first gasket 226 is made of elastic materials such as foam, rubber, silica gel, etc., to buffer the collision between the first elastic member 220 and the counterweight 232 that may occur when the first elastic member 220 is deformed.

Further, the second elastic member 500 is V-shaped, and the second elastic member 500 includes a fourth branch 510 , a fifth branch 520 and an elastic portion 530 connecting the fourth branch 510 and the fifth branch 520 . The second elastic member 500 includes a third end 501 connected with the rigid member 210 and a fourth end 502 connected with the housing 100 . The third end 501 is located on the fourth branch 510 , and the fourth end 502 is located on the fifth branch 520 . In this embodiment, the fourth branch 510 is fixedly connected to the rigid member 210 , and the fifth branch 520 is fixedly connected to the circumferential side wall 130 . During the vibrating process of the vibrator assembly 200, the fourth branch 510 and the fifth branch 520 alternately move towards each other and move away from each other. It can be understood that in other embodiments, the second elastic member 500 may also be in a U-shape, and two ends of the second elastic member 500 are respectively connected to the rigid member 210 and the circumferential side wall 130 .

Further, the surfaces of the fourth branch 510 and the fifth branch 520 opposite to each other are provided with second spacers 540 . The second gasket 540 is made of elastic materials such as foam, rubber, silica gel, etc., to buffer the collision when the second elastic member 500 is deformed.

Further, the rigid part 210 includes two first connecting parts 211 oppositely disposed along the second direction and a second connecting part 212 connected between the two first connecting parts 211 , and the second connecting parts 212 are used to hold the rigid part The rigidity of 210 is stable, so that the relative positions of the two first connecting parts 211 are kept stable during the vibration process of the vibrator unit 230 and the vibration process of the vibrator assembly 200, so as to ensure that the above-mentioned vibration process can be performed in a preset manner and improve the stability of vibration . Further, each of the first elastic members 220 is disposed on both sides of the same first connecting portion 211 in a one-to-one correspondence with each of the second elastic members 500 . Specifically, the first end 2201 on the first elastic member 220 is disposed on the side of the first connecting portion 211 close to the counterweight 232 , and the third end on the second elastic member 500 corresponding to the first elastic member 220 501 is disposed on the side of the first connecting portion 211 away from the counterweight 232 .

Further, the rigid member 210 is an annular member and is arranged around the vibrator unit 230 . Specifically, the number of the second connecting parts 212 is two, and they are oppositely arranged along the first direction and connect the corresponding ends of the first connecting parts 211 , so as to ensure the rigidity and stability of the rigid member 210 . In this embodiment, the rigid member 210 is rectangular. It can be understood that in other embodiments, the rigid member 210 can also be in the shape of a circle, an ellipse or a polygon, and the vibrator unit 230 and the vibrator assembly 200 can be adjusted by changing the shape of the rigid member 210 or setting a counterweight on the rigid member 210 Vibration range to ensure the stability of vibration.

In this embodiment, the first direction is orthogonal to the second direction. It can be understood that in other embodiments, the angular relationship between the first direction and the second direction can also be preset to other angles except orthogonal, that is, the first elastic member 220 , the second elastic member 500 , the rigid member 210 The angle between the first direction and the second direction is adjusted according to the specific form of the counterweight 232 to meet different vibration requirements of the vibration motor 10 .

The above are only the embodiments of the present application. It should be pointed out that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present application, but these all belong to the protection of the present application. scope.

Claims

A vibration motor, comprising a housing with an accommodation space, and a vibrator assembly and a stator assembly accommodated in the accommodation space, the stator assembly being fixed on the casing and arranged at a relative distance from the vibrator assembly, characterized in that The vibrator assembly includes a rigid member, a first elastic member and a vibrator unit, the first elastic member is located between the rigid member and the vibrator unit, and the vibrator unit is fixed by the first elastic member The rigid member can vibrate back and forth in a first direction, the first elastic member can provide a first restoring force for the vibrator unit to vibrate back and forth in the first direction, and the vibration motor further includes a second elastic member. the housing and the rigid part are connected by the second elastic part, so as to suspend the vibrator assembly in the receiving space, the vibrator assembly can vibrate back and forth in the second direction, the second The elastic member can provide the vibrator assembly with a second restoring force for reciprocating vibration along the second direction, and the first direction and the second direction are perpendicular.
The vibration motor of claim 1, wherein the stiffness of the first elastic member along the first direction is smaller than the stiffness of the second elastic member along the second direction.
The vibration motor according to claim 2, wherein the modal frequency of the vibrator unit along the first direction is less than or equal to the modal frequency of the vibrator assembly along the second direction.
The vibration motor according to any one of claims 1 to 3, wherein the number of the first elastic members is two, and the two first elastic members are respectively disposed in the first direction along the first direction. On both sides of the vibrator unit, the number of the second elastic members is two, and the two second elastic members are respectively disposed on both sides of the vibrator assembly along the second direction.
The vibration motor according to claim 4, wherein the rigid member comprises two first connecting parts oppositely arranged along the second direction and a second connecting part connected between the two first connecting parts The connection part, the second connection part is used to maintain the rigidity and stability of the rigid member, and each of the first elastic parts corresponds to each of the second elastic parts, which are respectively disposed in the same first connection part. sides.
The vibration motor according to claim 5, wherein the rigid member is a ring member and is arranged around the vibrator unit.
The vibration motor according to claim 6, wherein the first elastic member is C-shaped, and the first elastic member comprises a first end connected with the first connection portion and connected with the vibrator unit the second end.
The vibration motor according to claim 7, wherein the second elastic member is V-shaped, and the second elastic member comprises a third end connected with the first connecting portion and connected with the housing the fourth end.
The vibration motor according to claim 8, wherein a damping member is connected between the first elastic member and the vibrator unit.
The vibration motor according to claim 9, wherein two stoppers are further accommodated in the receiving space, and the two stoppers are oppositely arranged along the first direction and correspond to the vibrator units one-to-one. The two ends of the vibrator unit are provided with avoidance grooves for avoiding the stopper.
The vibration motor according to claim 10, wherein the number of the stator assemblies is two, the two stator assemblies are oppositely arranged along a third direction and are located on both sides of the vibrator assembly, and the vibration motor A circuit board is also included, the circuit board is used for delivering electric power to the stator assembly, so that the stator assembly can generate a magnetic field, and the third direction is perpendicular to the plane where the first direction and the second direction are located.