Linear Vibration Motor

Abstract

A linear vibration motor is provided. [Solution] The linear vibration motor includes a housing having an accommodation space, a vibration assembly, and a stator assembly, the vibration assembly including a mass block, a magnetic steel assembly fixed to the mass block, and an elastic member, the mass block is provided with an accommodation space for accommodating the magnetic steel assembly, the mass block includes side walls and a bottom wall surrounding the accommodation space, the magnetic steel assembly includes a first magnetic steel, a second magnetic steel, and a third magnetic steel fixed to the bottom wall, the mass block further includes a fixing boss protruding from the bottom wall toward the second magnetic steel, and the second magnetic steel is fixed to the fixing boss. The adhesive strength between the magnetic steel assembly and the mass block in the linear vibration motor according to the present invention is high, which effectively improves the vibration stability and magnetic field performance of the linear vibration motor.

Description

[Technical field]

[0001] The present invention relates to the field of motor technology, and in particular to a linear vibration motor applied in the field of mobile electronic products. [Background technology]

[0002] 2. Description of the Related Art With the development of electronic technology, portable consumer electronic products are becoming more and more popular. For example, electronic products such as mobile phones, portable game consoles, navigation devices, portable multimedia entertainment devices, etc. generally use linear vibration motors to provide system feedback, such as incoming call notification, information notification, navigation notification for mobile phones, and vibration feedback for game consoles.

[0003] A conventional linear vibration motor includes a housing having an accommodation space, a vibration assembly located in the accommodation space, and a stator assembly fixed to the housing, the stator assembly including a coil, and the vibration assembly including a mass block having an accommodation space and magnetic steel housed in the accommodation hole, and the coil and the magnetic steel interact with each other to generate a driving force to drive the reciprocating vibration of the vibration assembly, thereby providing a sense of vibration.

[0004] However, in the structure of the linear vibration motor in the prior art, when the vibration assembly includes three or more magnetic steels, the magnetic steels on both sides are generally first fixed to the mass block by adhesive, but after the magnetic steels on both sides are glued and hardened, the adhesive overflows to the position where the middle magnetic steel is located. After the magnetic steel located in the middle position is assembled, the magnetic steel interferes with the hardened adhesive and cannot be fixed to the fixing surface of the mass block, causing the middle magnetic steel to protrude, which not only reduces the adhesive strength of the middle magnetic steel, but also creates a risk of falling off during the vibration process, and adversely affects the magnetic field performance of the magnetic circuit system.

[0005] Therefore, there is a need to provide a new linear vibration motor to solve the above problems. Summary of the Invention [Problem to be solved by the invention]

[0006] In view of the above problems, the present invention provides a linear vibration motor with high adhesive strength of magnetic steel. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention provides a linear vibration motor, the linear vibration motor including a housing having an accommodation space, and a vibration assembly and a coil accommodated in the accommodation space, the vibration assembly including a mass block accommodated in the accommodation space, a magnetic steel assembly fixed to the mass block, and an elastic member for driving the reciprocating motion of the mass block, the coil being installed facing the magnetic steel assembly, the mass block being provided with an accommodation space for accommodating the magnetic steel assembly, the mass block including a side wall and a bottom wall surrounding the accommodation space, the magnetic steel assembly including a first magnetic steel, a second magnetic steel, and a third magnetic steel accommodated in the accommodation space and arranged in order along a first direction, the first magnetic steel, the second magnetic steel, and the third magnetic steel are all fixed to the bottom wall by adhesion, the mass block further includes a fixing boss protruding from the bottom wall toward the second magnetic steel, and the second magnetic steel is fixed to the fixing boss.

[0008] Preferably, the first magnetic steel and the third magnetic steel are both spaced apart from the fixing boss in the first direction.

[0009] Preferably, in the first direction, the width of the fixing boss is smaller than the width of the second magnetic steel.

[0010] Preferably, the fixing boss extends along a second direction perpendicular to the first direction, and in the second direction, a width of the second magnetic steel is greater than a width of the fixing boss.

[0011] Preferably, an adhesive receiving groove is provided on an edge of the bottom wall and recessed in a direction away from the second magnetic steel, and the adhesive receiving groove is ring-shaped.

[0012] Preferably, both ends of the fixing boss in the second direction extend to the adhesive receiving groove.

[0013] Preferably, in the first direction, an edge of the first magnetic steel member that leaves the second magnetic steel member is provided to correspond to the adhesive accommodating groove, and an edge of the third magnetic steel member that leaves the second magnetic steel member is provided to correspond to the adhesive accommodating groove.

[0014] Preferably, the surface of the second magnetic steel leaving the fixing boss is flush with the surface of the first magnetic steel leaving the bottom wall. Effect of the Invention

[0015] Compared with the prior art, the linear vibration motor of the present invention includes a housing having an accommodation space, a vibration assembly, and a stator assembly, the vibration assembly including a mass block accommodated in the accommodation space, a magnetic steel assembly fixed to the mass block, and an elastic member driving the reciprocating motion of the mass block, the mass block has an accommodation space for accommodating the magnetic steel assembly, the mass block includes side walls and a bottom wall surrounding the accommodation space, the magnetic steel assembly includes a first magnetic steel, a second magnetic steel, and a third magnetic steel accommodated in the accommodation space and arranged in sequence along a first direction, the first magnetic steel, the second magnetic steel, and the third magnetic steel are all fixed to the bottom wall, the mass block further includes a fixing boss protruding from the bottom wall toward the second magnetic steel, and the second magnetic steel is fixed to the fixing boss. By providing a fixing boss on the bottom wall of the mass block and fixing the second magnetic steel provided at the middle position to the fixing boss, the impact of adhesive overflow on the fixing surface of the second magnetic steel and the mass block when assembling the first magnetic steel and the third magnetic steel is avoided, the adhesive strength between the second magnetic steel and the mass block is effectively improved, the vibration stability and magnetic field performance of the magnetic steel assembly are ensured, and the vibration performance of the linear vibration motor is effectively improved. [Brief description of the drawings]

[0016] [Figure 1] 1 is a perspective view of a linear vibration motor according to the present invention; [Diagram 2] FIG. 2 is an exploded perspective view of the linear vibration motor according to the present invention. [Diagram 3] FIG. 2 is a cross-sectional view taken along the line AA in FIG. [Figure 4] FIG. 2 is a cross-sectional view taken along line BB in FIG. [Diagram 5] FIG. 2 is a perspective view of a mass block of the linear vibration motor of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings of the embodiments of the present invention.

[0018] 1 and 2, the present invention provides a linear vibration motor 100. The linear vibration motor 100 includes a housing 1 having an accommodation space 10, and a vibration assembly 2 and a coil 3 housed in the accommodation space 10, and the coil 3 drives the vibration assembly 2 to vibrate back and forth, thereby providing a sense of vibration.

[0019] The housing 1 includes an upper case 11 having an accommodation space, and a lower cover 12 fixed to the upper case 11, and the upper case 11 and the lower cover 12 form the accommodation space 10 by surrounding it.

[0020] The vibration assembly 2 includes a mass block 21 accommodated in the accommodation space 10, a magnetic steel assembly 22 fixed to the mass block 21, and an elastic member 23 that drives the reciprocating motion of the mass block 21. Specifically, there are two elastic members 23, each located on either side of the mass block 21, with one end of the elastic member 23 fixed to the mass block 21 and the other end fixed to the upper case 11, thereby supporting the mass block 21 in the accommodation space 10.

[0021] The coil 3 is fixed to the lower cover 12. The coil 3 is disposed opposite the magnetic steel assembly 22 and generates an interaction force to drive the mass block 21 and the magnetic steel assembly 22 to vibrate reciprocally.

[0022] As shown in Figures 2 to 5, the mass block 21 is provided with an accommodation space 211 that accommodates the magnetic steel assembly 22. Specifically, the mass block 21 includes a side wall 212 and a bottom wall 213 that are formed to surround the accommodation space 211. The magnetic steel assembly 22 includes a first magnetic steel 221, a second magnetic steel 222, and a third magnetic steel 223 that are accommodated in the accommodation space 211 and arranged in order along a first direction X, and the first magnetic steel 221, the second magnetic steel 222, and the third magnetic steel 223 are all fixed to the bottom wall 213 by adhesion. The mass block 21 further includes a fixing boss that protrudes from the bottom wall 213 toward the second magnetic steel 222, and the second magnetic steel 222 is fixed to the fixing boss. In addition, in the assembly process of the first magnetic steel 221, the second magnetic steel 222, and the third magnetic steel 223, the first magnetic steel 221 and the third magnetic steel 223 are fixed to the bottom wall 213 by adhesion, and in this process, some adhesive may overflow outside the first magnetic steel 221. However, by providing the fixing boss 214, it is possible to effectively prevent the overflowing adhesive from overflowing onto the fixing boss 214, and to increase the adhesive strength by increasing the adhesive area between the second magnetic steel 222 and the fixing boss 214. Along the first direction X, the first magnetic steel 221 and the third magnetic steel 223 are both provided at intervals from the fixing boss 214, which further prevents the adhesive from overflowing onto the fixing boss 214, thereby providing a space for the adhesive when the second magnetic steel 222 is attached, and preventing the adhesive from overflowing onto the first magnetic steel 221 and the second magnetic steel 222 or the third magnetic steel 223 and affecting the flatness of the attachment between the second magnetic steel 222 and the fixing boss 214.

[0023] 3, in the first direction X, the width of the fixed boss 214 is smaller than the width of the second magnetic steel 222. As shown in Fig. 4, the fixed boss 214 further extends along a second direction Y perpendicular to the first direction X, and in the second direction Y, the width of the second magnetic steel 222 is larger than the width of the fixed boss 214.

[0024] The first magnetic steel 221, the second magnetic steel 222, and the third magnetic steel 223 are all fixed in contact with the side wall 212. An adhesive accommodating groove 215 is formed on the edge of the bottom wall 213 by being recessed in a direction away from the second magnetic steel 222, and the adhesive accommodating groove 215 has a ring shape. In the first direction X, the edge of the first magnetic steel 221 on the side away from the second magnetic steel 222 is provided corresponding to the adhesive accommodating groove 215, and the edge of the third magnetic steel 223 on the side away from the second magnetic steel 222 is provided corresponding to the adhesive accommodating groove 215. The adhesive accommodating groove 215 can accommodate adhesive that overflows when the first magnetic steel 221 and the third magnetic steel 223 are attached. In the second direction Y, both ends of the fixing boss 214 extend to the adhesive accommodating groove 215, but do not extend above the adhesive accommodating groove 215.

[0025] Furthermore, the surface of the second magnetic steel 222 that faces away from the fixed boss 214 is flush with the surface of the first magnetic steel 221 that faces away from the bottom wall 213, and similarly, the surface of the second magnetic steel 222 that faces away from the fixed boss 214 is flush with the surface of the third magnetic steel 223 that faces away from the bottom wall 213.

[0026] Compared with the prior art, the linear vibration motor of the present invention includes a housing having an accommodation space, a vibration assembly, and a stator assembly, the vibration assembly including a mass block accommodated in the accommodation space, a magnetic steel assembly fixed to the mass block, and an elastic member driving the reciprocating motion of the mass block, the mass block has an accommodation space for accommodating the magnetic steel assembly, the mass block includes side walls and a bottom wall surrounding the accommodation space, the magnetic steel assembly includes a first magnetic steel, a second magnetic steel, and a third magnetic steel accommodated in the accommodation space and arranged in sequence along a first direction, the first magnetic steel, the second magnetic steel, and the third magnetic steel are all fixed to the bottom wall, the mass block further includes a fixing boss protruding from the bottom wall toward the second magnetic steel, and the second magnetic steel is fixed to the fixing boss. By providing a fixing boss on the bottom wall of the mass block and fixing the second magnetic steel provided at the middle position to the fixing boss, the impact of adhesive overflow on the fixing surface of the second magnetic steel and the mass block when assembling the first magnetic steel and the third magnetic steel is avoided, the adhesive strength between the second magnetic steel and the mass block is effectively improved, the vibration stability and magnetic field performance of the magnetic steel assembly are ensured, and the vibration performance of the linear vibration motor is effectively improved.

[0027] The above is an embodiment of the present invention, and those skilled in the art may make various modifications without departing from the creative concept of the present invention, all of which are within the scope of protection of the present invention.

Claims

1. 1. A linear vibration motor, comprising: The housing has an accommodation space, and a vibration assembly and a coil are accommodated in the accommodation space, a vibration assembly including a mass block accommodated in the accommodation space, a magnetic steel assembly fixed to the mass block, and an elastic member driving the reciprocating motion of the mass block, the coil being installed facing the magnetic steel assembly, the mass block having an accommodation space for accommodating the magnetic steel assembly, the mass block having side walls and a bottom wall surrounding the accommodation space, the magnetic steel assembly including a first magnetic steel, a second magnetic steel, and a third magnetic steel accommodated in the accommodation space and arranged in sequence along a first direction, the first magnetic steel, the second magnetic steel, and the third magnetic steel being all fixed to the bottom wall by adhesion, the mass block further including a fixing boss protruding from the bottom wall toward the second magnetic steel, and the second magnetic steel being fixed to the fixing boss.

2. 2 . The linear vibration motor according to claim 1 , wherein the first magnetic piece and the third magnetic piece are spaced apart from the fixed boss in the first direction.

3. 2. The linear vibration motor according to claim 1, wherein the width of the fixed boss in the first direction is smaller than the width of the second magnetic steel.

4. The linear vibration motor according to claim 1, characterized in that the fixed boss extends along a second direction perpendicular to the first direction, and in the second direction, the width of the second magnetic steel is greater than the width of the fixed boss.

5. The linear vibration motor according to claim 4, characterized in that an adhesive accommodating groove is provided on the edge of the bottom wall, the adhesive accommodating groove being recessed in a direction away from the second magnetic steel, and the adhesive accommodating groove is ring-shaped.

6. 6. The linear vibration motor according to claim 5, wherein both ends of the fixing boss extend to the adhesive receiving groove in the second direction.

7. The linear vibration motor described in claim 5, characterized in that in the first direction, an edge of the first magnetic steel on a side away from the second magnetic steel is arranged to correspond to the adhesive accommodating groove, and an edge of the third magnetic steel on a side away from the second magnetic steel is arranged to correspond to the adhesive accommodating groove.

8. 2. The linear vibration motor according to claim 1, wherein a surface of the second magnetic steel member that faces away from the fixed boss is flush with a surface of the first magnetic steel member that faces away from the bottom wall.

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