Linear vibration motor

Abstract

The invention relates to the technical field of vibration motors, in particular to a linear vibration motor which comprises an upper shell, a middle frame, a first vibrator assembly, a first elastic piece, a second vibrator assembly, a second elastic piece, a stator assembly and a lower shell. The first vibrator assembly, the second vibrator assembly and the stator assembly are arranged in the containing space at intervals, the first vibrator assembly and the second vibrator assembly are elastically connected and fixed between the upper shell and the lower shell through the first elastic piece and the second elastic piece respectively, and the stator assembly is fixedly arranged on the lower shell. The stator assembly comprises a flexible circuit board and a coil, and the coil is arranged between the first vibrator assembly and the second vibrator assembly in parallel. The linear vibration motor is simple in structure and convenient to assemble, two-way vibration in the X direction and the Z direction can be achieved through the two vibrator assemblies at the same time, and different vibration sense experiences are provided.

Description

Technical Field

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

[0002] Linear vibration motors are commonly found in smart electronic devices such as mobile phones and tablet computers. They are used to provide vibration feedback to consumers to alert them, such as incoming phone calls and game vibration alerts.

[0003] A linear vibration motor usually includes a housing, a vibrator assembly and a stator assembly. The housing forms a housing space, and the vibrator assembly and the stator assembly are spaced apart in the housing space. The vibrator assembly includes a mass block, a magnet and an elastic member, and the stator assembly includes a flexible circuit board and a coil. The coil is energized through the flexible circuit board of the stator assembly using the principle of electromagnetic induction, driving the vibrator assembly equipped with a magnet to perform reciprocating cyclic motion, thereby achieving reciprocating regular vibration of the linear vibration motor. Existing linear vibration motors usually only have one vibrator assembly, which results in a single vibration sense of the linear vibration motor, which cannot meet consumers' demand for multi-directional vibration experience. Summary of the invention

[0004] In order to overcome the problem of single vibration sense in the linear vibration motor in the prior art, the present invention proposes a linear vibration motor with simple structure and X-direction and Z-direction vibration sense, and its specific technical solution is as follows:

[0005] A linear vibration motor comprises an upper shell, a middle frame, a first vibrator assembly, a first spring sheet located on the left and right sides of the first vibrator assembly, a second vibrator assembly, a second spring sheet located on the upper and lower sides of the second vibrator assembly, a stator assembly and a lower shell, wherein the upper shell, the middle frame and the lower shell are combined to form an accommodating space, wherein the first vibrator assembly, the second vibrator assembly and the stator assembly are arranged in the accommodating space at intervals, wherein the first vibrator assembly and the second vibrator assembly are elastically connected and fixed between the upper shell and the lower shell respectively by the first spring sheet and the second spring sheet, wherein the stator assembly is fixedly arranged on the lower shell, wherein the stator assembly comprises a flexible circuit board and a coil, wherein the coil is arranged in parallel between the first vibrator assembly and the second vibrator assembly.

[0006] Furthermore, the first vibrator assembly includes a first mass block in a rectangular parallelepiped shape and a first magnet embedded in the first mass block.

[0007] Furthermore, two first grooves are symmetrically formed on a surface of one side of the first mass block facing the coil along the X-axis, and the first magnets with different magnetic poles are respectively embedded in the first grooves. The two first magnets correspond to the coil and are arranged in parallel and at intervals.

[0008] Furthermore, the first spring piece includes a first connecting portion which is inclined and parallel on the left and right sides of the first mass block, and a first fixing portion which extends in the same direction and in parallel from the free ends on both sides of the connecting portion; the two first fixing portions located above the first mass block are respectively welded to the left inner surface of the upper shell and the right upper surface of the first mass block, and the corresponding two first fixing portions located below the first mass block are respectively welded to the left lower surface of the first mass block and the right inner surface of the lower shell.

[0009] Furthermore, the second vibrator assembly includes a second mass block in a rectangular parallelepiped shape and a second magnet embedded in the second mass block.

[0010] Furthermore, a second groove is formed in the middle of a surface of one side of the second mass block facing the coil, and the second magnet is embedded in the second groove. The second magnet corresponds to the coil and is arranged in parallel and at intervals.

[0011] Furthermore, the second spring piece includes a second connecting portion which is inclined and parallel on the upper and lower sides of the second mass block, and a second fixing portion which extends in parallel from the free ends on both sides of the second connecting portion; the two second fixing portions located above the second mass block are respectively welded to the left upper surface of the second mass block and the right inner surface of the upper shell, and the corresponding two second fixing portions located below the second mass block are respectively welded to the left inner surface of the lower shell and the right lower surface of the second mass block.

[0012] Furthermore, the upper shell and the lower shell are respectively arranged in a square plate shape, the middle frame is surrounded by four side walls, and the four side edges of the upper shell and the lower shell are respectively arranged to be concave-convexly matched with the upper and lower side edges of the side walls of the middle frame.

[0013] Furthermore, the first vibrator assembly and the second vibrator assembly further include a first pole piece and a second pole piece, respectively.

[0014] Furthermore, the coil is placed in parallel and spaced apart between the first pole piece and the second pole piece.

[0015] The beneficial effects of the present invention are as follows: by arranging the vibrator assemblies in parallel and at intervals on both sides of the stator assembly, bidirectional vibration in the X direction and the Z direction is achieved, providing different vibration experiences; by arranging pole pieces on the first vibrator assembly and the second vibrator assembly, which are used as magnetic concentrating media, the magnetic field induction intensity is increased, thereby increasing the vibration intensity of the linear vibration motor and enhancing the vibration experience of consumers; the linear vibration motor of the present invention has a simple structure and is easy to assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an assembly stereogram of the linear vibration motor of the present invention.

[0017] Figure 2 It is a structural explosion diagram of the linear vibration motor of the present invention.

[0018] Figure 3 It is an exploded view of the structure of the first vibrator assembly according to the first embodiment of the present invention.

[0019] Figure 4 It is an exploded view of the structure of the second vibrator assembly according to the first embodiment of the present invention.

[0020] Figure 5 FIG. 1 is a cross-sectional view of the linear vibration motor according to the first embodiment of the present invention taken along the Y axis.

[0021] Figure 6 It is an exploded view of the structure of the first vibrator assembly according to the second embodiment of the present invention.

[0022] Figure 7 It is an exploded view of the structure of the second vibrator assembly according to the second embodiment of the present invention.

[0023] in:

[0024] 11-upper shell; 12-middle frame; 13-lower shell;

[0025] 20-stator assembly; 21-flexible circuit board; 22-coil;

[0026] 30- a first vibrator assembly;

[0027] 31-first mass block; 32-first magnet; 33-first spring piece; 34-first pole piece;

[0028] 331-first connecting portion; 332-first fixing portion;

[0029] 40- a second vibrator assembly;

[0030] 41 - second mass block; 42 - second magnet; 43 - second spring piece; 44 - second pole piece;

[0031] 431 - second connecting portion; 432 - second fixing portion. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 this field without creative work are within the scope of protection of the present invention.

[0033] The first embodiment of the present invention is Figures 1 to 5As shown, a linear vibration motor is provided, including an upper shell 11, a middle frame 12, a lower shell 13, a stator assembly 20, a first vibrator assembly 30, a first spring piece 33 located on the left and right sides of the first vibrator assembly 30, a second vibrator assembly 40 and a second spring piece 43 located on the upper and lower sides of the second vibrator assembly 40, the upper shell 11 and the lower shell 13 are respectively arranged in a square plate shape, the middle frame 12 is surrounded by four side walls, and the four side edges of the upper shell 11 and the lower shell 13 are respectively concave and convex (not marked) on the upper and lower sides of the side wall of the middle frame to adapt to the upper shell 11, the middle frame 12 and the lower shell 13. The combination is then welded and fixed, and the upper shell 11, the middle frame 12 and the lower shell 13 are welded together to form an accommodating space (not marked), and the stator The stator assembly 20, the first vibrator assembly 30 and the second vibrator assembly 40 are spaced apart in the accommodating space, the stator assembly 20 is fixedly arranged on the lower shell 13, the stator assembly 20 includes a flexible circuit board 21 and a coil 22, the flexible circuit board 21 is bonded and fixed on the lower shell 13, the coil 22 is vertically bonded and fixed on the flexible circuit board 21, the first vibrator assembly 30 and the second vibrator assembly 40 are elastically connected and fixed between the upper shell 11 and the lower shell 13 by the first spring piece 33 and the second spring piece 43 respectively, the coil 22 is spaced apart and parallelly arranged between the first vibrator assembly 30 and the second vibrator assembly 40, one end (not marked) of the flexible circuit board 21 is electrically connected to the coil 22, and the other end (not marked) is extended outside the middle frame 12 for external electrical connection. Figure 1 As shown, the X direction represents the left and right horizontal direction, the Y direction represents the front and back horizontal direction, and the Z direction represents the up and down vertical direction.

[0034] like Figure 3As shown, the first vibrator assembly 30 includes a first mass block 31 in a rectangular parallelepiped shape and a first magnet 32 ​​embedded in the first mass block 31. Two first grooves 310 are symmetrically concave on the X-axis of the surface of the first mass block 31 facing the coil 22, and first magnets 32 with different magnetic poles are respectively embedded in the first grooves 310. The two first magnets 32 correspond to the coil 22 and are arranged in parallel and spaced apart. Preferably, the first groove 310 penetrates the first mass block 31 in the Z direction to increase the area of ​​the first magnet 32 ​​corresponding to the coil 22 and enhance the induced magnetic field strength. The first spring piece 33 includes a first connecting portion 331 which is inclined and parallel to the left and right sides of the first mass block 31, and a first fixing portion 332 which extends in the same direction and in parallel from the free ends on both sides of the first connecting portion 331; the two first fixing portions 332 located above the first mass block 31 are respectively welded and fixed to the left inner surface of the upper shell 11 and the right upper surface of the first mass block 31, and the corresponding two first fixing portions 332 located below the first mass block 31 are respectively welded and fixed to the left lower surface of the first mass block 31 and the right inner surface of the lower shell 13. The first spring pieces 33 on the left and right sides are arranged in a diamond shape to elastically suspend the first vibrator assembly 30 in the accommodating space and keep it parallel to the coil 22. The inclined first connecting portions 331 on the left and right sides are used as elastic arms. When the coil 22 is energized, the first vibrator assembly 30 equipped with the first magnet 32 ​​can reciprocate along the X direction.

[0035] like Figure 4 As shown, the second vibrator assembly 40 includes a second mass block 41 in the shape of a rectangular parallelepiped, a second magnet 42 embedded in the second mass block 41, and second springs 43 located at the upper and lower sides of the second mass block 41. A second groove 410 is recessed in the middle of the surface of one side of the second mass block 41 facing the coil 22, and the second magnet 42 is embedded in the second groove 410. The second magnet 42 corresponds to the coil 22 and is arranged in parallel and spaced apart. Preferably, the second groove 410 penetrates the second mass block 41 in the Z direction to increase the area of ​​the second magnet 42 corresponding to the coil 22 and enhance the induced magnetic field strength. The second spring piece 43 includes a second connecting portion 431 which is arranged in an inclined and parallel manner on the upper and lower sides of the second mass block 41, and a second fixing portion 432 which extends in parallel from the free ends on both sides of the second connecting portion 431; the two second fixing portions 432 located above the second mass block 41 are respectively welded to fix the upper surface on the left side of the second mass block 41 and the inner surface on the right side of the upper shell 11, and the corresponding two second fixing portions 432 located below the second mass block 41 are respectively welded to fix the inner surface on the left side of the lower shell 13 and the lower surface on the right side of the second mass block 41. The second spring pieces 43 on the upper and lower sides are arranged in a diamond shape to elastically suspend the second vibrator assembly 40 in the accommodating space and keep it parallel to the coil 22. The inclined second connecting portions 431 on the upper and lower sides are used as elastic arms. When the coil 22 is energized, the first vibrator assembly 30 equipped with the second magnet 42 can reciprocate along the Z direction.

[0036] The second embodiment of the present invention is Figure 6 and Figure 7 As shown, the first vibrator assembly 30 and the second vibrator assembly 40, based on the first embodiment, further include a first pole piece 34 and a second pole piece 44, which are used as magnetic collecting media to improve the magnetic field strength; the first pole piece 34 is set to 1 or 2 pieces corresponding to the first magnet 32, covering the first magnet 32; the second pole piece 44 is set to 1 piece corresponding to the second magnet 42, covering the second magnet 42; the coil 22 is arranged between the first pole piece 34 and the second pole piece 44 in parallel and at intervals, and the principle of electromagnetic induction is utilized to energize the coil 22, thereby driving the first vibrator assembly 30 and the second vibrator assembly 40 equipped with the first magnet 32 ​​and the second magnet 42 to perform reciprocating cyclic motion at the same time. The first pole piece 34 and the second pole piece 44 are respectively used as magnetic collecting media of the first magnet 32 ​​and the second magnet 42, thereby improving the overall magnetic field induction strength of the linear vibration motor, and simultaneously improving the reciprocating vibration strength of the first vibrator assembly 30 and the second vibrator assembly 40 in the X direction and the Z direction, respectively, thereby improving the vibration experience of consumers.

[0037] The assembly steps of the linear vibration motor of the present invention are as follows:

[0038] a. First, prepare the stamping forming upper shell 11, middle frame 12 and lower shell 13;

[0039] b. Secondly, the coil 22 is bonded and fixed on the flexible circuit board 21 to form a stator assembly 20, and the assembled stator assembly 20 is bonded and fixed to the Y-axis symmetrical position of the lower shell 13;

[0040] c. Again, the first magnet 32 ​​and the second magnet 42 are respectively embedded in the first mass block 31 and the second mass block 41 to form the first vibrator assembly 30 and the second vibrator assembly 40, respectively, and one end of the first spring piece 33 and the second spring piece 43 are respectively welded and fixed to the diagonal surfaces on the upper and lower sides of the first mass block 31 and the second mass block 41, and the other end is respectively welded and fixed to the diagonal inner surfaces of the upper shell 11 and the lower shell 13;

[0041] d. Finally, the upper shell 11 and the lower shell 13 equipped with the stator assembly 20 and the vibrator assemblies 30 and 40 are positioned by a jig (not shown), and the convex and concave edges of the four sides of the upper shell 11 and the lower shell 13 are matched with the convex and concave edges of the upper and lower edges of the four side walls of the middle frame 12. The middle frame 12 is welded and fixed at the joint positions with the upper shell 11 and the lower shell 13 respectively, thereby completing the assembly of the linear vibration motor.

[0042] The linear vibration motor of the present invention has a simple structure and is easy to assemble. It uses the principle of electromagnetic induction to connect an external power supply and a power supply coil 22 through a flexible circuit board 21, and at the same time drives the first vibrator assembly 30 equipped with a first magnet 32 ​​and a second magnet 42 respectively in the X direction and the second vibrator assembly 40 in the Z direction to vibrate in both directions.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A linear vibration motor, characterized in that: The invention comprises an upper shell, a middle frame, a first vibrator assembly, a first spring sheet located on the left and right sides of the first vibrator assembly, a second vibrator assembly, a second spring sheet located on the upper and lower sides of the second vibrator assembly, a stator assembly and a lower shell. The upper shell, the middle frame and the lower shell are combined to form an accommodating space. The first vibrator assembly, the second vibrator assembly and the stator assembly are arranged in the accommodating space at intervals. The first vibrator assembly and the second vibrator assembly are elastically connected and fixed between the upper shell and the lower shell respectively by the first spring sheet and the second spring sheet. The stator assembly is fixedly arranged on the lower shell. The stator assembly comprises a flexible circuit board and a coil. The coil is arranged in parallel between the first vibrator assembly and the second vibrator assembly.

2. A linear vibration motor according to claim 1, characterized in that: The first vibrator assembly includes a first mass block in a rectangular parallelepiped shape and a first magnet embedded in the first mass block.

3. A linear vibration motor according to claim 2, characterized in that: Two first grooves are symmetrically formed on a surface of one side of the first mass block facing the coil along the X-axis, and the first magnets with different magnetic poles are respectively embedded in the first grooves. The two first magnets correspond to the coil and are arranged in parallel and at intervals.

4. A linear vibration motor according to claim 2, characterized in that: The first spring piece includes a first connecting portion which is inclined and parallel on the left and right sides of the first mass block, and a first fixing portion which extends in the same direction and in parallel from the free ends on both sides of the connecting portion; the two first fixing portions located above the first mass block are respectively welded to the left inner surface of the upper shell and the right upper surface of the first mass block, and the corresponding two first fixing portions located below the first mass block are respectively welded to the left lower surface of the first mass block and the right inner surface of the lower shell.

5. The linear vibration motor according to claim 1, characterized in that: The second vibrator assembly includes a second mass block in a rectangular parallelepiped shape and a second magnet embedded in the second mass block.

6. A linear vibration motor according to claim 5, characterized in that: A second groove is formed in the middle of a surface of the second mass block facing the coil, and the second magnet is embedded in the second groove. The second magnet corresponds to the coil and is arranged in parallel and at intervals.

7. The linear vibration motor according to claim 5, characterized in that: The second spring piece includes a second connecting portion which is inclined and parallel on the upper and lower sides of the second mass block, and a second fixing portion which extends in parallel from the free ends on both sides of the second connecting portion; the two second fixing portions located above the second mass block are respectively welded to the left upper surface of the second mass block and the right inner surface of the upper shell, and the corresponding two second fixing portions located below the second mass block are respectively welded to the left inner surface of the lower shell and the right lower surface of the second mass block.

8. The linear vibration motor according to claim 1, characterized in that: The upper shell and the lower shell are correspondingly arranged in a square plate shape, the middle frame is surrounded by four side walls, and the four side edges of the upper shell and the lower shell are respectively arranged to be concave-convexly matched with the upper and lower side edges of the side walls of the middle frame.

9. A linear vibration motor according to any one of claims 1 to 8, characterized in that: The first vibrator assembly and the second vibrator assembly further include a first pole piece and a second pole piece, respectively.

10. The linear vibration motor according to claim 9, characterized in that: The coils are placed in parallel and spaced apart between the first pole piece and the second pole piece.

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