Linear vibration motor with elastic members with brackets, foams and damping glue

One of the objects of the present invention is to provide a linear vibration motor which improves damping performance and reduces assembly costs. Accordingly, the present invention provides a linear vibration motor having a housing body with an inner cavity; a weight accommodated in the housing body; a stator located in the housing body; and an elastic member suspending the weight in the housing body. The elastic member includes a first elastic member having a first fixed part fixedly connected to one side of the weight and a first elastic bracket extending from the first fixed part, and a second elastic member fixedly connected to an opposite side of the weight a first damping glue locating between the first elastic member and the weight, and locating at one end of the first elastic bracket close to the first fixed part.

FIELD OF THE PRESENT DISCLOSURE

The present disclosure relates to motors, in particular to a linear vibration motor for providing tactile feedback.

DESCRIPTION OF RELATED ART

Portable electronic devices such as mobile phones, handheld game consoles, and navigation devices in the related art are becoming more and more popular. These products generally use linear vibration motors for system feedback, such as mobile phone call prompts, information prompts, navigation prompts, and vibration feedback from game consoles.

A related linear vibration motor usually includes a housing with an accommodation space, and a stator, a vibrator, and a V-shaped spring accommodated in the housing. Wherein, the vibrator includes a magnet and a weight, and the vibrator and the stator are connected by a V-shaped spring.

For related linear vibration motors, foams are arranged as damping on the side of the V-shaped spring close to the weight, and between the weight and weight. The foams are arranged to increase the damping value of the linear vibration motor. Adding foam to the V-spring of the linear vibration motor by the above method, however, will cause the V-spring to deform greatly after the foam is compressed. At the same time, the damping value provided by the foam located in the middle of the weight side is small, which cannot meet the performance requirements of the linear vibration motor.

SUMMARY OF THE PRESENT INVENTION

One of the objects of the present invention is to provide a linear vibration motor which improves damping performance and reduces assembly costs.

To achieve the above-mentioned objects, the present invention provides a linear vibration motor having a housing body with an inner cavity; a weight accommodated in the housing body; a stator located in the housing body; and an elastic member suspending the weight in the housing body. The elastic member includes a first elastic member having a first fixed part fixedly connected to one side of the weight and a first elastic bracket extending from the first fixed part, and a second elastic member fixedly connected to an opposite side of the weight a first damping glue locating between the first elastic member and the weight, and locating at one end of the first elastic bracket close to the first fixed part.

The linear vibration motor further includes a first foam between the first elastic member and the weight. The first foam locates on the same side of the first elastic bracket as the first damping glue, and locates on a side of the first damping glue away from the first fixed part.

In addition, the first elastic member further includes a second fixed part fixedly connected to an inner wall of the housing body, and a second elastic bracket extending from the second fixed part and bendingly connected with the first elastic bracket for forming a V-shape; the second fixed part is opposite to the first fixed part.

In addition, the first foam locates opposite to a middle of the first elastic bracket.

In addition, a side of the weight facing the first elastic member forms a first accommodation cavity for partially accommodating the first damping glue; the first damping glue abuts against the first elastic member. The weight forms a third accommodation cavity arranged in parallel with the first accommodation cavity for partially accommodating the first foam; the first foam abuts against the first elastic bracket.

In addition, the second elastic member locates on a side of the weight away from the first elastic member; and the linear vibration motor further includes a second damping glue connected between the second elastic member and the weight. The second elastic member includes a third fixed part fixedly connected to the weight and a third elastic bracket extending from the third fixed part; the second damping glue is arranged at one end of the third elastic bracket close to the third fixed part. A second foam is arranged on the same side as the second damping glue between the second elastic member and the weight in the abutting manner; the second foam is arranged on the side of the second damping glue away from the third fixed part.

In addition, the second elastic member further includes a fourth fixed part fixedly connected to an inner wall of the housing body, and a fourth elastic brake extending from the fourth fixed part and bending and connecting with the third elastic brake to form a V shape, and the third fixed part is arranged opposite to the fourth fixed part.

In addition, the second foam is arranged opposite to a middle of the third elastic bracket.

In addition, a side of the weight facing the second elastic member forms a second accommodation cavity for partially accommodating the second damping glue; the second damping glue abuts against the second elastic member. The weight is concavely provided with a fourth accommodation cavity arranged in parallel with the second accommodation cavity. The second foam is embedded in the fourth accommodation cavity and protrudes out of the fourth accommodation cavity. The second foam is in contact with the third elastic bracket.

In Addition, one end of the first accommodation cavity penetrates the bottom of the weight, and the other end extends toward the top of the weight to a set distance; one end of the third accommodation cavity penetrates the bottom of the weight, and the other end extends toward the top of the weight to a set distance.

In addition, one end of the second accommodation cavity penetrates the bottom of the weight, and the other end extends toward the top of the weight for forming a distance; one end of the fourth accommodation cavity penetrates the bottom of the weight and faces the inner wall of the housing body, and the other end extends toward the top of the weight for forming a distance.

DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENT

The present disclosure will hereinafter be described in detail with reference to an exemplary embodiment. To make the technical problems to be solved, technical solutions and beneficial effects of the present disclosure more apparent, the present disclosure is described in further detail together with the figures and the embodiment. It should be understood the specific embodiment described hereby is only to explain the disclosure, not intended to limit the disclosure.

As shown inFIG.1, a linear vibration motor includes a housing body1, a weight2accommodated in the housing body1, and a stator3located in the weight2, and an elastic member that suspended weight2in housing body1. The elastic member includes a first elastic member4. The first elastic member4is located on the side of weight2. One end of the first elastic member4is connected to the end of the side wall of the weight2, and the other end is connected to the side wall of the housing body1. Wherein, the first elastic member4includes a first fixed part43, which is fixedly connected to the side wall of the weight2. a first elastic bracket41extending from the first fixed part43, and a second fixed part44connected to the inner wall of the housing body1, and a second elastic bracket42extending from the second fixed part44and bending and connecting with the first elastic bracket41to form a V-shape. The first fixed part43is fixedly connected with the weight2and the second fixed part44is fixedly connected with the inner wall of the housing body1, so that the weight2can better reciprocate under the elastic abutment of the first elastic member4.

A first damping glue5abuts between the side walls of the first elastic member4and the weight2in the direction close to one end of the first fixed part43. Set first damping glue5so that when weight2is displaced in housing body1, first damping glue5will cause greater mechanical damping between first elastic member4and weight2. Wherein, the rigidity of the first damping glue5is weaker than that of the foam compared with the foam used in the prior art. Therefore, it is difficult for the elastic member to deform too much after the foam is compressed, which causes the damping value provided by the foam to become smaller. In turn, the impact on the operating frequency of the linear vibration motor is reduced. In addition, in the assembly process of the linear vibration motor, assembling the first damping glue5only needs to be injected and fixed. Compared with the foam assembly process in the prior art, the assembly process using the first damping glue5is simpler and the assembly cost is lower.

The first damping glue5is arranged close to the junction of first elastic bracket41and the weight2. That is, first damping glue5is arranged close to the first fixed part43. Because the first elastic member4is arranged in a V shape, a gap with an included angle is formed between the first elastic member4and the side wall of the weight2. In turn, the closer to the connection, the smaller the gap. Therefore, it is difficult for the first damping glue5arranged near the above-mentioned connection to leak through the above-mentioned gap.

A first foam30abuts between the first elastic member4and the side wall of the weight2. Wherein, the first foam30is located on the side of the first damping glue5away from the first fixed part43and is embedded on the weight2. The embedded assembly method makes it difficult for the first foam30to be separated from the weight2. In addition, first foam30and first damping glue5are set in parallel. In this way, the damping effect of the linear vibration motor can be significantly improved, making the linear vibration motor more stable.

As a specific embodiment, as shown inFIG.1, the first foam30includes a first bump301embedded in the weight2and a first abutment part302integrally formed with the first bump301. The first bump301embedded in the weight2is used to limit the position of the first abutment part302integrally formed with the first bump301on the side wall of the weight2. In order to make the first foam30arranged between the first elastic member4and the side wall of the weight2more stable. The first abutment part302abuts on the middle part of the first elastic bracket41. At the same time, the first abutment part302is also located in the middle of the weight2. And the sidewall of the first abutment part302away from the first bump301abuts against the weight2. The first abutment part302is arranged in the middle of the first elastic bracket41, and the middle of the weight2is less rigid than the first abutment part302is arranged in the connection. It reduces the occurrence of deformation of the first elastic member4due to excessive rigidity of the first foam30.

As a specific embodiment, as shown inFIG.1, the housing body1includes an upper housing body11and a lower housing body12joined with the upper housing body11. The lower housing body12is provided with a circuit board13electrically connected to the stator3. An accommodation cavity21is arranged on the weight2. The stator3is located in the accommodation cavity21. A magnet22is provided on the peripheral wall of accommodation cavity21. A permeable sheet23is provided on the sidewall of the accommodation cavity21parallel to the axis direction of the stator3. The permeable sheet23is located between the magnet22and the side wall of the accommodation cavity21. The stator3includes an iron core31fixed on the lower housing body11and a coil32wound on the iron core31. The iron core31equipped with the coil32is located in the accommodation cavity21. And magnet22is located in its circumferential direction. Wherein, as shown inFIG.2, two position limiting sheets14are provided on the side wall of the upper housing body11facing the lower housing body12. Effectively restrict the reciprocating position of weight2in housing body1, reducing the excessive squeezing of the elastic member by weight2causing the elastic member to undergo elastic deformation too quickly, thereby increasing the service life of the elastic member.

As shown inFIGS.1-3, the side of the weight2facing the first elastic member4is recessed with a first accommodation cavity6for accommodating the first damping glue5. The first accommodation cavity6is arranged to accommodate the first damping glue5in the weight2to increase the volume of the first damping glue5. In this way, the first damping glue5abutting between the first elastic member4and the weight2is difficult to detach from the weight2in the first accommodation cavity6. It effectively reduces the occurrence of the first damping glue5falling off the weight2due to the linear vibration motor falling, shaking or falling.

Wherein, the first accommodation cavity6is arranged close to the junction of the first elastic member4and the weight2. Place the first accommodation cavity6close to the joint to increase the volume of the first damping glue5at the joint. The first damping glue5can not only be set close to the gap of the above-mentioned connection, the space formed by first accommodation cavity6and first elastic member4limits the position of first damping glue5. This makes it difficult for the first damping glue5to be separated from the weight2from the first accommodation cavity6.

The first damping glue5is embedded in the first accommodation cavity6and one end of the first damping glue5protruding from the accommodation cavity abuts the first elastic member4. The first damping glue5is embedded and installed in the first accommodation cavity6, so that the first damping glue5can realize the self-fixing effect in the first accommodation cavity6. The part of the first damping glue5protruding from the side wall of the weight2abuts with the first elastic member4, so that the first damping glue5is difficult to detach from the first accommodation cavity6from the weight2. It can effectively ensure the damping performance of the first damping glue5, thereby reducing the impact on the operating frequency of the linear vibration motor.

As shown inFIGS.1,3-5, the weight2is also recessed with a third accommodation cavity40arranged in parallel with the first accommodation cavity6. The first accommodation cavity6and the third accommodation cavity40are arranged in parallel, so that the first damping glue5assembled in the first accommodation cavity6and the first foam30assembled in the third accommodation cavity40are arranged in parallel. The first foam30is embedded in the third accommodation cavity40and protrudes out of the third accommodation cavity40. And the first foam30abuts the first elastic member41. So that the first foam30can realize the self-fixing effect in the third accommodation cavity40. The part of the first foam30protruding from the side wall of the weight2abuts the first elastic member41. It not only makes it difficult for the first foam30to separate from the third accommodation cavity40to weight2but also effectively ensures the damping performance of the first foam30. In turn, the impact on the operating frequency of the linear vibration motor is reduced.

As shown inFIG.1andFIG.3, elastic member also includes a second elastic member7. Wherein, the second elastic member7includes a third fixed part73which is fixedly connected to the side wall of the weight2, and a third elastic bracket71which is extended from the third fixed part73, a fourth fixed part74is fixedly connected to the inner wall of housing body1, and a fourth elastic bracket72that extends from the fourth fixed part74and bends and connects with the third elastic bracket71to form a V-shape. The third fixed part73and the fourth fixed part74are set opposite to each other. The third fixed part73is fixedly connected to the weight2and the fourth fixed part74is fixedly connected to the inner wall of the housing body1. So that weight2can better reciprocate under the elastic abutment of the second elastic member4.

The second elastic member7is located on the side of weight2away from the first elastic member4. And one end of the second elastic member7is connected to the end of the side wall of the weight2. The other end is connected with the side wall of the housing body1away from the first elastic member4. A second elastic member7is arranged on the side of weight2away from the first elastic member4to achieve the purpose of suspending the weight2in the housing body1and reduce the friction of the weight2in the housing body1.

A second damping glue8abuts between the side wall of the second elastic member7and the side wall of the weight2in the direction close to the end of the third fixed part73. Set second damping glue8so that when the weight2is displaced between the first elastic member4and the second elastic member7, the second damping glue8causes greater mechanical damping between the second elastic member7and the weight2. Wherein, the rigidity of the second damping glue8is weaker than that of the foam compared with the foam used in the prior art. Therefore, it is difficult for the elastic member to deform too much after the foam is compressed, which causes the damping value provided by the foam to become smaller. In turn, the impact on the operating frequency of the linear vibration motor is reduced. In addition, in the assembly process of the linear vibration motor, assembling the second damping glue8only needs to be injected and fixed. Compared with the foam assembly process in the prior art, the assembly process using the second damping glue8is simpler and the assembly cost is lower.

The second damping glue8is arranged close to the connection between the third elastic bracket71of the second elastic member7and the weight2. That is, the second damping glue8is arranged close to the third fixed part73. Because the second elastic member7is arranged in a V shape, a gap with an included angle is formed between the second elastic member7and the side wall of the weight2. In turn, the closer to the connection, the smaller the gap. Therefore, it is difficult for the second damping glue8arranged near the above-mentioned connection to leak through the above-mentioned gap.

A second foam50abuts between the second elastic member7and the side wall of the weight2. Wherein, the second foam50is located on the side of the second damping glue8away from the third fixed part73and is embedded on the weight2. The embedded assembly method makes it difficult for the second foam50to be separated from the weight2. In addition, the second foam50and the second damping glue8are arranged in parallel, so that the damping effect of the linear vibration motor can be significantly improved, making the linear vibration motor more stable.

As shown inFIGS.1,3-5, the side of the weight2facing the second elastic member7is recessed with a second accommodation cavity9for accommodating the second damping glue8. And the second accommodation cavity9is arranged close to the first fixed part73. The second accommodation cavity9is arranged to accommodate the second damping glue8in the weight2to increase the volume of the second damping glue8. In this way, the second damping glue8abutting between the second elastic member7and the weight2is difficult to detach from the weight2in the second accommodation cavity9. This effectively reduces the occurrence of the second damping glue8falling off from the weight2due to falling, shaking or falling of the linear vibration motor.

The weight2is also concavely provided with a fourth accommodation cavity60arranged in parallel with the second accommodation cavity9. The second accommodation cavity9and the fourth accommodation cavity60are arranged in parallel, so that the second damping glue8installed in the second accommodation cavity9and the second foam50installed in the fourth accommodation cavity60are installed in parallel. The second foam50is embedded in the fourth accommodation cavity60and protrudes out of the fourth accommodation cavity60. In addition, the second foam50is in contact with the second elastic member7, so that the second foam50can achieve a self-fixing effect in the fourth accommodation cavity60. Moreover, the part of the second foam50protruding from the side wall of the weight2abuts with the second elastic member7, which not only makes it difficult for the second foam50to separate from the fourth accommodation cavity60out of the weight2, but also effectively ensures the damping performance of the second foam50. In turn, the impact on the operating frequency of the linear vibration motor is reduced.

As a specific embodiment, as shown inFIGS.1,3-5, the second foam50includes a second bump501embedded in the fourth accommodation cavity60and a second abutment part502integrally formed with the second bump501. The second bump501embedded in the fourth accommodation cavity60is used to limit the position of the second abutment part502integrally formed with the second bump501on the side wall of the weight, so as to make the second foam50set between the second elastic member7and the weight side2walls, the stability is better. The second abutment part502abuts on the middle part of the third elastic bracket71. At the same time, the second abutment part502is also located in the middle of the weight2. Besides, the sidewall of the second abutment part502away from the second bump501abuts the weight2. The rigidity of setting the second abutment part502in the middle of the third elastic bracket71and the middle of the weight2is weaker than setting the second abutment part502in the connection. In this way, it reduces the deformation of the second elastic member7due to the excessive rigidity of the second foam50,

As a specific embodiment, as shown inFIGS.1and3, one end of the first elastic member4is welded and fixed to one side of the weight2. One end of the second elastic member7is welded and fixed to the side of the weight2away from the first elastic member4. and the first elastic member4and the second elastic member7oppositely are set on both sides of the weight2. Wherein, the first elastic member4is arranged with an opening due to its V-shaped design. In the same way, the second elastic member7also has openings. Wherein, the opening of the first elastic member4on the weight2is arranged opposite to the opening of the second elastic member7. Thus, when the weight2moves, its stability is better than the one set in the same direction.

As shown inFIG.1andFIG.3, the first damping glue5and the second damping glue8are set in a staggered manner. The staggered the first damping glue5and the second damping glue8are used to provide the moving the weight2with a higher damping value than the foam in the prior art. And because of the weak rigidity of the first damping glue5and the second damping glue8. This makes it difficult for the greater mechanical damping provided by the first damping glue5and second damping glue8to affect the working frequency of the motor.

As shown inFIG.1andFIG.3, one end of the first accommodation cavity6penetrates the bottom of the weight2. The other end extends toward the top of weight2to a set distance. On the one hand, it is convenient to manufacture the above-mentioned first accommodation cavity6on weight2. The processing technology of the first accommodation cavity6is simplified, and the manufacturing cost thereof is reduced. On the other hand, it is convenient to inject the first damping glue5set in the first accommodation cavity6. This simplifies the assembly process of the first damping glue5, is easy to assemble and reduces its assembly cost.

One end of the third accommodation cavity40penetrates the bottom of the weight2, and the other end extends toward the top of the weight2to a set distance. In order to fit the first foam30from the third accommodation cavity40through the opening at the bottom of the weight2into the third accommodation cavity40. This makes the assembly process of the first foam30to the weight2easier.

As shown inFIGS.3-5, one end of the second accommodation cavity9penetrates the bottom of the weight2. The other end extends toward the top of the weight2to a set distance. On the one hand, it is convenient to manufacture the second accommodation cavity9on the weight2. The processing technology of the second accommodation cavity9is simplified, and its manufacturing cost is reduced. On the other hand, it is convenient to inject the second damping glue8in the second accommodation cavity9. This simplifies the assembly process of second damping glue8, which is easy to assemble and reduces its assembly cost.

One end of the fourth accommodation cavity60penetrates the bottom of the weight2, and the other end extends toward the top of the weight1to a set distance. In order to fit the first foam30from the third accommodation cavity40through the opening at the bottom of the weight2into the third accommodation cavity40. This makes the assembly process of the first foam30to the weight2easier.

As shown inFIGS.1,3-5, the distance from the central axis of the first accommodation cavity6to the weight2is the same as the distance from the central axis of the second accommodation cavity9to the weight2. In this way, when the weight2located between the first elastic member4and the second elastic member7moves, the damping on both sides is the same, thereby improving the performance of the linear vibration motor. The distance from the center axis of the third accommodation cavity40to the weight is the same as the distance from the center axis of the fourth accommodation cavity60to the weight. So that the weight2located between the first elastic member4and the second elastic member7has the same damping on both sides when it moves. In turn, the performance and stability of the linear vibration motor are improved.

As a specific embodiment, as shown inFIG.1,FIG.3andFIG.4, the upper and lower ends of the connection between weight2and first fixed part43are provided with first welding slots10for accommodating welding points. The upper and lower ends of the connection between the weight2and the third fixed part73are provided with second welding slots20for accommodating welding points.