Vibration motor

Abstract

Disclosed in the present invention is a vibration motor, comprising a hollow external frame having a cavity and, accommodated in the cavity, a vibration unit and a driving unit for driving the vibration unit to vibrate in a reciprocating mode, the vibration unit being suspended in the cavity by means of a clamping piece. The side of the external frame corresponding to the driving unit is provided with a cantilever, which elastically bears the driving unit, the direction in which the elastic deformation of the cantilever is generated being orthogonal to the direction in which the elastic deformation of the clamping piece is generated, so as to inhibit redundant deviating vibration generated in the working process of the vibration motor.

Description

Vibration motor Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a vibration motor. Background Art

[0002] With the development of science and technology and the progress of society, portable electronic products such as mobile phones, handheld game consoles, navigation devices or handheld multimedia entertainment devices are widely used in people's daily lives. In some usage scenarios of these electronic products, such as incoming call notifications, message notifications, navigation notifications on mobile phones, and vibration feedback on game consoles, they are generally achieved through vibration motors.

[0003] The vibration motor of the related art includes a vibration unit and a drive unit. The drive unit is fixed and the vibration is generated by the lateral vibration of the vibration unit. Generally, the vibration unit is clamped by an elastic element and the elastic element provides elastic restoring force, which ultimately produces reciprocating motion. In actual operation, asymmetric assembly of the elastic element or differences in the structure of the elastic element itself, or uneven mass of the vibration unit will cause the vibration direction of the vibration unit to be not linear, but to produce deflection in other directions. This deflection is redundant vibration, which will cause noise and even be inconsistent with the pre-set vibration effect.

[0004] Therefore, it is necessary to provide a product that solves the above problems. Technical issues

[0005] An object of the present invention is to provide a vibration motor to eliminate the polarization phenomenon of a vibration unit during vibration, thereby improving the stability and reliability of the vibration motor. Technical Solutions

[0006] In order to achieve the above-mentioned purpose, an embodiment of the present invention provides a vibration motor, which includes an external frame, which is hollow and forms a cavity; a vibration unit, which is arranged in the cavity; a drive unit, which is arranged in the cavity and is used to drive the vibration unit to vibrate; a clip, which suspends the vibration unit in the cavity; the external frame is provided with a plurality of slots on the side surface corresponding to the drive unit to form a cantilever with an end connected to the side surface, the drive unit is arranged close to the side surface, and the drive unit is elastically connected to the external frame through the cantilever, and the elastic deformation direction of the cantilever is orthogonal to the elastic deformation direction of the clip.

[0007] Preferably, the clip is provided on both sides of the vibration unit, one end of the clip is fixed to the external frame, and the other end is fixed to the vibration unit.

[0008] Preferably, the side surface is provided with two cantilevers with free ends facing each other, and the driving unit is connected to the two cantilevers at the same time.

[0009] Preferably, the driving unit includes a magnetic conductive structure and a coil wound around the magnetic conductive structure.

[0010] Preferably, the driving unit includes a magnetic conductive structure and a coil wound around the magnetic conductive structure, the magnetic conductive structure includes two first parts arranged opposite to each other and a second part connecting the two first parts, the coil is wound around the second part, and the two first parts are respectively fixed to the two cantilevers.

[0011] Preferably, the vibration unit has a mass block and a magnet fixedly connected to the mass block, a magnetic conductive plate is provided between the magnet and the mass block, the driving unit is at least partially surrounded by the mass block, and a gap is provided between the part of the driving unit surrounded by the mass block and the magnet.

[0012] Preferably, the external frame is further provided with a limiting block for limiting the vibration unit and a circuit board for feeding power to the driving unit.

[0013] The present invention also provides a linear vibration motor, which includes an external frame and a vibration unit and a drive unit surrounded by the external frame. The vibration unit includes a mass block, and the drive unit is used to drive the vibration unit to vibrate reciprocally. One of the vibration unit and the drive unit is provided with a coil, and the other is provided with a magnet that electromagnetically interacts with the coil. The external frame has a side surface, and along a direction perpendicular to the reciprocating motion of the vibration unit, at least a portion of the drive unit is located between the vibration unit and the side surface. A cantilever with one end connected to the other free end of the side surface is provided at a position corresponding to the drive unit on the side surface. The end of the drive unit close to the side surface is elastically connected to the cantilever, and the direction of elastic deformation of the cantilever is consistent with the connecting line of the vibration unit, the drive unit and the side surface.

[0014] Preferably, the vibration motor further comprises a clip, which elastically suspends the vibration unit within the external frame, and the elastic deformation direction of the clip is consistent with the reciprocating motion direction of the vibration unit.

[0015] Preferably, the vibration motor has two opposite cantilevers, the side surface is provided with a slot, the two cantilevers are placed in the slot, and the free ends of the two cantilevers are arranged opposite to each other.

[0016] Preferably, the vibration unit includes a magnet fixedly connected to the mass block, the driving unit includes a magnetic conductive structure and a coil wound around the magnetic conductive structure, the driving unit is at least partially surrounded by the mass block, and there is a gap between the part surrounded by the mass block and the magnet.

[0017] Preferably, the driving unit includes a magnetic conductive structure and a coil wound around the magnetic conductive structure, the magnetic conductive structure includes two first parts arranged opposite to each other and a second part connecting the two first parts, the coil is wound around the second part, and the two first parts are respectively fixed to the two cantilevers. Beneficial effects

[0018] The novel vibration motor of the present invention comprises an external frame having a cavity, a vibration unit housed in the cavity, and a drive unit for driving the vibration unit to reciprocate. The vibration unit is suspended from the cavity by a clip; the drive unit is secured to the external frame by a cantilever. In this structure, the drive unit is elastically secured to the external frame. When the vibration unit generates redundant vibrations in other directions, the drive unit is capable of generating reverse vibrations at the same frequency as the redundant vibrations of the vibration unit. This reduces the amount of redundant vibration in other directions while maintaining the desired vibration direction of the vibration motor. This provides a damping effect in other directions, eliminates polarization, and improves the stability of the vibration motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art in the art can also derive other drawings based on these drawings without inventive efforts. Among them:

[0020] FIG1 is a perspective view of a vibration motor of the present invention;

[0021] FIG2 is a partial exploded perspective view of the structure of the vibration motor of the present invention;

[0022] FIG3 is a schematic perspective structural diagram of a side surface of a driving unit corresponding to an outer frame of a vibration motor of the present invention;

[0023] FIG4 is a schematic diagram of a three-dimensional structure of a vibration motor in which a magnetic conductive structure and two cantilevers are fixedly connected;

[0024] FIG5 is a cross-sectional view of the vibration motor of the present invention taken along line AA in FIG1 ;

[0025] The reference numerals in the accompanying drawings represent the following:

[0026] 1. External frame; 11. Side; 11a. Cantilever;

[0027] 2. Vibration unit; 21. Clip; 22. Mass block; 23. Magnet; 24. Magnetic plate; 25. Damping element;

[0028] 3. Drive unit; 31. Magnetic conductive structure; 31a. First part; 31b. Second part; 32. Coil;

[0029] 4. Circuit board;

[0030] 5. Limit block; Modes for Carrying Out the Invention

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field of the present invention without making any creative efforts are within the scope of protection of the present invention.

[0032] 1-5 , the present invention provides a vibration motor 100 , which includes a hollow outer frame 1 forming a cavity, and a vibration unit 2 and a driving unit 3 accommodated in the cavity.

[0033] The vibration unit 2 is suspended in the cavity by a clip 21. A plurality of slots are provided on the side 11 of the external frame 1 corresponding to the drive unit 3 to form a cantilever 11a having an end connected to the side 11. The drive unit 3 is arranged close to the side 11. The drive unit 3 is elastically connected to the external frame 1 through the cantilever 11a, and the elastic deformation direction of the cantilever 11a is orthogonal to the elastic deformation direction of the clip 21.

[0034] As shown in Figures 3 and 4, in this embodiment, the side 11 is provided with two cantilevers 11a with free ends facing each other, and the drive unit 3 is simultaneously connected to the two cantilevers 11a. It should be noted that, in other embodiments, the number of cantilevers 11a is not limited to two, but can also be one, three or more; as shown in Figure 3, the shape of the cantilever 11a is a rectangular strip formed by local groove cutting of the side 11, and the three edges of the square strip are separated from the external frame 1. Of course, in other embodiments, the cantilever 11a can also be of other shapes.

[0035] The vibration unit 2 includes a mass block 22 running through the middle and a magnet 23 fixedly connected to the mass block 22. In order to concentrate the magnetic field, a magnetic conductive plate 24 is also provided between the magnet 23 and the mass block 22; the clip 21 is arranged on both sides of the vibration unit 2 along the vibration direction of the vibration unit 2, one end of the clip 21 is fixed to the external frame 1, and the other end is fixed to the mass block 22. A damping member 25 can also be clamped between the clip 21 and the mass block 22. During the reciprocating motion of the vibration unit 2, the presence of the damping member 25 can make the movement of the vibration unit 2 softer and more stable.

[0036] The drive unit 3 is used to drive the vibration unit 2 to vibrate. The drive unit 3 is at least partially surrounded by the mass block 22. A gap is provided between the portion of the drive unit 3 surrounded by the mass block 22 and the magnet 23. Specifically, the drive unit 3 includes a magnetic conductive structure 31 and a coil 32 wound around the magnetic conductive structure 31. As shown in FIG5 , the cross-sectional view of the magnetic conductive structure 31 along line AA in FIG1 is an "I" shape, comprising two first portions 31a disposed opposite each other and a second portion 31b connecting the two first portions 31a. The coil 32 is wound around the second portion 31b. The drive unit 3 is elastically connected to the external frame 1 via the cantilever 11a. As shown in FIG4 , the two first portions 31b of the magnetic conductive structure 31 are respectively fixed to the free ends of the two cantilevers 11a.

[0037] The vibration motor 100 further includes a circuit board 4 for feeding power to the driving unit 3 and a limit block 5 fixed to the external frame 1 , the limit block 5 limiting the displacement of the vibration unit 2 .

[0038] Furthermore, the present invention provides another linear vibration motor, which specifically includes an outer frame 1 and a vibration unit 2 and a driving unit 3 enclosed by the outer frame 1 .

[0039] The outer frame 1 has a side surface 11. Along the direction perpendicular to the reciprocating motion of the vibration unit 2, the drive unit 3 is at least partially located between the vibration unit 2 and the side surface 11. A cantilever 11a is provided on the side surface 11 at a position corresponding to the drive unit 3, with one end connected to the side surface 11 and the other end being free. The end of the drive unit 3 close to the side surface 11 is elastically connected to the cantilever 11a, and the direction of elastic deformation of the cantilever 11a is consistent with the line connecting the vibration unit 2, the drive unit 3 and the side surface 11.

[0040] As shown in this embodiment, the cantilever 11 a is provided in the form of a groove on the side surface 11 . In other embodiments, the arrangement of the cantilever 11 a is not limited thereto and may be provided in other ways.

[0041] The vibration unit 2 includes a mass block 22 . The driving unit 3 is used to drive the vibration unit 2 to vibrate back and forth. One of the vibration unit 2 and the driving unit 3 is provided with a coil 32 , and the other is provided with a magnet 23 that electromagnetically interacts with the coil 32 .

[0042] It should be noted that, in this embodiment, the vibration unit 2 is provided with a magnet 23 , and the drive unit 3 includes a coil 32 . It is understandable that, in other embodiments, the opposite may be true: the vibration unit 2 includes a coil 32 , and the drive unit 3 includes a magnet 23 .

[0043] The vibration unit 2 is elastically suspended in the external frame 1 by means of the clip 21 , and the direction of elastic deformation of the clip 21 is consistent with the reciprocating motion direction of the vibration unit 2 .

[0044] The drive unit 3 is used to drive the vibration unit 2 to reciprocate. Along the direction perpendicular to the reciprocating motion of the vibration unit 2, the drive unit 3 is at least partially located between the vibration unit 2 and the side surface 11. It should be noted that in this embodiment, the drive unit 3 is at least partially surrounded by the mass block 22, and there is a gap between the portion surrounded by the mass block 22 and the magnet 23. In other embodiments, the drive unit 3 and the mass block 22 can also be arranged in other positional relationships.

[0045] Compared with the related art, the present invention elastically fixes the drive unit 3 to the external frame 1. When the vibration unit 2 generates redundant vibrations in other directions, the drive unit 3 can generate reverse vibrations with the same frequency as the redundant vibrations of the vibration unit 2, thereby reducing the redundant vibrations in other directions without affecting the vibration amount of the vibration motor in the ideal direction, achieving a shock-absorbing effect in other directions, eliminating polarization, and improving the stability of the vibration motor.

[0046] The above description is merely an embodiment of the present invention. It should be pointed out that a person skilled in the art in the field of the present invention may make improvements without departing from the inventive concept of the present invention, but these improvements shall all fall within the scope of protection of the present invention.

Claims

1. A vibration motor, comprising: An outer frame, the outer frame being hollow and forming a cavity; A vibration unit, disposed within the cavity; A driving unit, disposed within the cavity and configured to drive the vibration unit to vibrate; A clip, suspending the vibration unit within the cavity; characterized in that, On a side surface of the outer frame corresponding to the driving unit, a plurality of slots are provided to form cantilevers having ends connected to the side surface. The driving unit is disposed close to the side surface. The driving unit is elastically connected to the outer frame through the cantilevers, and the elastic deformation direction of the cantilevers is orthogonal to the elastic deformation direction of the clip.

2. The vibration motor according to claim 1, characterized in that: The clip is disposed on both sides of the vibration unit. One end of the clip is fixed to the outer frame, and the other end is fixed to the vibration unit.

3. The vibration motor according to claim 1, characterized in that: Two cantilevers with opposite free ends are provided on the side surface, and the driving unit is simultaneously connected to the two cantilevers.

4. The vibration motor according to claim 1, characterized in that: The driving unit includes a magnetic conduction structure and a coil wound around the magnetic conduction structure.

5. The vibration motor according to claim 3, characterized in that: The driving unit includes a magnetic conduction structure and a coil wound around the magnetic conduction structure. The magnetic conduction structure includes two relatively arranged first parts and a second part connecting the two first parts. The coil is wound around the second part, and the two first parts are respectively fixed to the two cantilevers.

6. The vibration motor according to claim 4 or 5, characterized in that: The vibration unit has a mass block and a magnet fixedly connected to the mass block. A magnetic conduction plate is further provided between the magnet and the mass block. At least a part of the driving unit is surrounded by the mass block, and a gap is provided between the part of the driving unit surrounded by the mass block and the magnet.

7. The vibration motor according to claim 6, characterized in that: The outer frame is further provided with a limiting block for limiting the vibration unit and a circuit board for feeding power to the driving unit.

8. A vibration motor, comprising an outer frame, and a vibration unit and a driving unit enclosed by the outer frame. The vibration unit includes a mass block, and the driving unit is used to drive the vibration unit to vibrate reciprocally. One of the vibration unit and the driving unit is provided with a coil, and the other is provided with a permanent magnet that electromagnetically interacts with the coil. The outer frame has a side surface. Along the direction perpendicular to the reciprocating movement of the vibration unit, at least a part of the driving unit is located between the vibration unit and the side surface. Characterized in that: On the side surface, at a position corresponding to the driving unit, a cantilever with one end connected to the side surface and the other end free is provided. One end of the driving unit close to the side surface is elastically connected to the cantilever, and the direction of elastic deformation of the cantilever is consistent with the connection line of the vibration unit, the driving unit, and the side surface.

9. The vibration motor according to claim 8, characterized in that: The vibration motor further includes a clip, the clip elastically suspending the vibration unit within the outer frame, and the elastic deformation direction of the clip is consistent with the reciprocating movement direction of the vibration unit.

10. The vibration motor according to claim 8, characterized in that: The vibration motor has two opposite cantilevers. An opening is provided on the side surface, and the two cantilevers are disposed within the opening, and the free ends of the two cantilevers are relatively arranged.

11. The vibration motor according to claim 8, characterized in that: The vibration unit includes a magnet fixedly connected to the mass block. The driving unit includes a magnetic conduction structure and a coil wound around the magnetic conduction structure. At least a part of the driving unit is surrounded by the mass block, and a gap is provided between the part of the driving unit surrounded by the mass block and the magnet.

12. The vibration motor according to claim 10, characterized in that: The driving unit includes a magnetic conduction structure and a coil wound around the magnetic conduction structure. The magnetic conduction structure includes two relatively arranged first parts and a second part connecting the two first parts. The coil is wound around the second part, and the two first parts are respectively fixed to the two cantilevers.

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