Cantilever type broadband vibration motor

Abstract

The utility model relates to the technical field of vibration motors, in particular to a cantilever type broadband vibration motor, which comprises a shell with an accommodating space, a stator assembly, a vibrator assembly, an elastic piece and a cover plate, the vibrator assembly comprises a mass block and a magnet, the vibrator assembly is suspended in the accommodating space of the shell through the elastic piece, the stator assembly comprises an annular coil and a flexible circuit board, and the elastic piece is arranged on the annular coil. The stator assembly is fixed on the cover plate, the shell is matched and buckled with the cover plate, the elastic piece is formed by integrally punching a metal sheet and comprises a magnet fixing part, a clamping part, a connecting part, an elastic piece, an elastic arm and a shell fixing part, the magnet is welded and fixed on the lower surface of the magnet fixing part, and the shell fixing part is welded and fixed on the inner surface of the shell. The coil is electrified to generate a magnetic field to drive the magnet to move up and down in a reciprocating manner, the elastic piece adopts a cantilever spring to realize large-amplitude swinging of the left side of the vibrator assembly, and meanwhile, a large magnet structure is adopted, so that wider vibration frequency is generated, and stronger vibration sense is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of vibration motors and discloses a cantilever wide-band vibration motor. Background Art

[0002] Micro vibration motors are commonly found in smart electronic devices such as mobile phones, tablet computers, and game controllers, and are used to provide vibration feedback to consumers to alert them, such as incoming phone calls, game vibration alerts, etc. The horizontal linear vibration motors currently on the market are powered by the stator assembly, and the coils in the stator assembly form a magnetic field, which drives the vibrator assembly with permanent magnet steel to perform reciprocating cyclic motion. However, as electronic devices are becoming increasingly miniaturized and thin, there is an urgent need for a vibration motor with a simple structure and strong vibration sensation in the limited vibration motor accommodation space that these electronic devices can provide to meet the needs of the market and consumers. Utility Model Content

[0003] The purpose of the utility model is to provide a cantilever wide-band vibration motor, aiming to solve the problem of weak vibration sense of existing vibration motors, and its specific technical solution is as follows:

[0004] A cantilever broadband vibration motor comprises a shell with an accommodating space, a stator assembly, a vibrator assembly, an elastic member and a cover plate, wherein the vibrator assembly comprises a mass block and a magnet, the vibrator assembly is suspended in the accommodating space of the shell by the elastic member, the stator assembly comprises a ring-shaped coil and a flexible circuit board, the stator assembly is fixed on the cover plate, the shell and the cover plate are adapted to snap together, the elastic member is punched out of a metal sheet as a whole, and comprises a rectangular magnet fixing portion, a clamping portion formed by bending and extending in the same direction from the long edges on both sides and the short edge on the left side of the magnet fixing portion toward the upper surface, a connecting portion formed by bending and extending from the short edge on the right side of the magnet fixing portion, an elastic sheet vertically bent and extended from the free end of the connecting portion, an elastic arm formed by reverse punching from the center of the elastic sheet, and a shell fixing portion formed by bending and extending from the free end of the elastic arm, the magnet is welded and fixed to the lower surface of the magnet fixing portion, and the shell fixing portion is welded and fixed to the inner surface of the shell.

[0005] Preferably, the connecting portion is Type; the holding portion and the housing fixing portion are The magnet fixing portion, the upper surface of the holding portion, the upper surface of the connecting portion, the elastic sheet and the upper surface of the shell fixing portion are parallel and not in the same plane, and the free ends of the magnet fixing portion and the shell fixing portion are arranged in the same direction.

[0006] Preferably, the elastic sheet is square, the elastic arm is trapezoidal, the elastic sheet and the elastic arm are located in the same plane, the elastic sheet is integrally connected to the right side of the elastic arm, and a gap is formed between the left side of the elastic sheet and the elastic arm.

[0007] Preferably, the elastic member includes the housing fixing portion, the connecting portion, the magnet fixing portion and the elastic sheet in order from top to bottom in the vertical direction thereof.

[0008] Preferably, the width of the elastic sheet is greater than the width of the magnet fixing portion or the connecting portion.

[0009] Preferably, the mass block is provided with a through hole adapted to the magnet, the magnet fixing portion is embedded in the through hole, the clamping portion is clamped and fixed to the upper surface of the mass block at the outer edge of the through hole, and the lower surface of the mass block protrudes below the magnet.

[0010] Preferably, the width and weight of the mass block on the right side of the through hole are smaller than those of the mass block on the left side, the mass block on the right side of the through hole is placed in the bent connecting portion, and there is a gap between the right side surface of the mass block and the inner wall surface of the connecting portion.

[0011] Preferably, the magnet and the coil are spaced apart and the inner area of ​​the coil is larger than the flat area of ​​the magnet.

[0012] Preferably, the coil is located below the mass block.

[0013] Preferably, the shell includes a bottom wall and a side wall, the upper surface of the shell fixing part is welded and fixed to the inner surface of the bottom wall, the first damping plate is arranged on the left upper surface of the bottom wall corresponding to the mass block, and the second damping plate is arranged on the left outer surface of the side wall corresponding to the mass block.

[0014] Compared with the prior art, the utility model is a cantilevered broadband vibration motor which adopts a large magnet structure and utilizes the coil to generate a magnetic field to drive the magnet to reciprocate up and down. The elastic part adopts a cantilever spring to achieve a large swing of the left side of the vibrator assembly, thereby generating a wider vibration frequency and a greater driving force, achieving a stronger vibration feeling. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an exploded view of the structure of the cantilever wide-band vibration motor of the utility model.

[0016] Figure 2 It is a cross-sectional view of the cantilever wide-frequency vibration motor of the utility model.

[0017] Figure 3 It is a three-dimensional diagram of the elastic member of the utility model.

[0018] Figure 4It is an assembly stereogram of the elastic member and the vibrator assembly of the utility model.

[0019] Figure 5 It is a structural exploded diagram of the elastic member and the vibrator assembly of the utility model.

[0020] in:

[0021] 1-housing; 10-bottom wall; 11-side wall;

[0022] 2- Cover plate:

[0023] 3-stator assembly; 30-coil; 31-flexible circuit board;

[0024] 4-vibrator assembly; 40-mass block; 41-magnet; 400-through hole;

[0025] 5-elastic member; 50-magnet fixing portion; 51-connecting portion; 52-elastic sheet; 53-elastic arm;

[0026] 54-housing fixing portion; 55-clamping portion; 510-gap; 520-crack;

[0027] 6-first damping plate; 7-second damping plate. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] The utility model is a cantilever wide-band vibration motor structure as follows Figure 1 and Figure 2As shown, the whole is a rectangular parallelepiped, including a shell 1 with an accommodating space, a stator assembly 3, a vibrator assembly 5, an elastic member 5 and a cover plate 2, the shell includes a bottom wall 10 and a side wall 11, the vibrator assembly 4 includes a mass block 40 and a magnet 41, the vibrator assembly 5 is suspended in the accommodating space of the shell 1 through the elastic member 5, the stator assembly 3 includes a ring coil 30 and a flexible circuit board 31, the stator assembly 3 is fixed on the cover plate 2, the shell 1 and the cover plate 2 are adapted to be buckled to form a cantilever broadband vibration motor of the utility model, the elastic member 5 is punched out of a metal sheet, one end of the elastic member 5 fixes the vibrator assembly 4, and the other end is fixed to the inner surface of the shell 1, so that the vibrator assembly 4 and the stator assembly 3 are arranged in the accommodating space at an interval of up and down. The coil 30 is located below the mass block 40, and the spacing height between the coil 30 and the mass block 40 is set according to the corresponding position space of the swing amplitude; the mass block 40 is vertically provided with a through hole 400 adapted to the magnet 41 in the thickness direction thereof, and the lower surface of the magnet 41 protrudes from the lower surface of the mass block 40, and the magnet 41 and the coil 30 are spaced and adapted. The utility model utilizes the magnetic field generated by energizing the coil 30 to drive the magnet 41 to reciprocate up and down, and the elastic member 5 adopts a cantilever spring to realize a large swing of the left side of the vibrator assembly 3, thereby generating a greater driving force and realizing a stronger vibration sense; the inner ring area of ​​the coil 30 is larger than the flat area of ​​the magnet 41, so that the magnet 41 will not collide with the coil 30 during the reciprocating swing of the vibrator assembly 3.

[0030] The elastic member 5 has a structure as follows: Figure 3 The cantilever spring shown in the figure comprises a rectangular magnet fixing portion 50, and a plurality of rectangular magnet fixing portions 50 formed by bending and extending in the same direction from the long edges on both sides and the short edge on the left side of the magnet fixing portion 50 toward the upper surface. The clamping portion 55 is formed by bending and extending from the short edge of the right side of the magnet fixing portion 50. The magnet fixing portion 50 is used for welding and fixing with the magnet 41 of the vibrator assembly 4, the shell fixing portion 54 is used for welding and fixing with the inner surface of the shell 1, the clamping portion 55 is used for welding and fixing with the upper surface of the mass block 40, and the connection portion 51 is used to make way for the right side of the through hole 400. The mass block 40; the elastic sheet 52 and the elastic arm 53 are located in the same plane, the elastic sheet 52 is square, the elastic arm 53 is trapezoidal, and a gap 520 is formed between the left sides of the elastic sheet 52 and the elastic arm 53. The gap 520 can cause deformation and resilience between the elastic sheet 52 and the elastic arm 53. The width of the right side is greater than the width of the left side. The right side of the elastic sheet 52 and the elastic arm 53 are connected as a whole to ensure that there is sufficient bonding force between the elastic sheet 52 and the elastic arm 53 to support the elastic sheet 52 and the elastic arm 5 3 deformation and resilience; the upper surfaces of the magnet fixing part 50, the clamping part 55, the connecting part 51, the elastic sheet 52 and the upper surface of the shell fixing part 54 are parallel and not in the same plane, the free ends of the magnet fixing part 50 and the shell fixing part 54 are arranged in the same direction, and the elastic member 5 is composed of the shell fixing part 54, the connecting part 51, the magnet fixing part 50 and the elastic sheet 52 from top to bottom in its vertical direction; the shell fixing part 54 is located between the magnet fixing part 50 and the elastic sheet 52 in the horizontal direction; the elastic sheet 52 is arranged ... The width of the sheet 52 is greater than the width of the magnet fixing portion 50 or the connecting portion 51, so that the elastic sheet 52 has sufficient area for punching to form the elastic arm 53; the distance from the side wall 11 on one side of the elastic sheet 52 to the outer wall of the mass block 40 is greater than the distance from the side wall 11 on the other side to the outer wall of the mass block 40, and the height difference between the elastic sheet 52 and the outer shell fixing portion 54 is set to provide sufficient deformation space for the elastic sheet 52, and the height of the connecting portion 51 and the inner surface of the bottom wall 10 is set to provide swinging space for the vibrator assembly 4.

[0031] The combined structure of the vibrator assembly 4 and the elastic member 5 is as follows: Figure 2 , Figure 4 and Figure 5 As shown, the magnet 41 is welded and fixed on the lower surface of the magnet fixing part 50. At this time, the magnet fixing part 50 can be used as a magnetic guide sheet of the magnet 41 to fix the magnet 41 and optimize the magnetic circuit. The magnet fixing part 50 is embedded in the through hole 400 of the mass block 40. The clamping portion 55 is used to clamp and fix the upper surface of the mass block 40 at the outer edge of the through hole 400. The setting of the clamping portion 55 avoids the plane warping caused by stress concentration after the large plane of the elastic member 5 is welded to the mass block 40. The lower part of the magnet 41 protrudes from the lower surface of the mass block 40; the magnet fixing portion 50 recessed and embedded in the through hole 400 cooperates with the mass block 40 and can be used to adjust the height position of the magnet 41 relative to the coil 30 below; the magnet 41 is adapted in the through hole 400 of the mass block 40, and the surface area of ​​the magnet 41 is equal to the lower surface area of ​​the magnet fixing portion 50. After the vibrator assembly 4 and the elastic member 5 are assembled, the magnet 41 is glued and fixed to the inner wall surface of the through hole 400 again; The connecting portion 51 of the type is used to give way to the mass block 40 on the right side of the through hole 400. The mass block 40 on the right side of the through hole 400 is placed in the connecting portion 51. There is a gap 510 between the right side surface of the mass block 40 and the inner wall surface of the connecting portion 51. When the vibrator assembly 4 is in the process of reciprocating swing, the setting of the gap 510 is used to avoid the reverse displacement of the mass block 40 during the swing; the vibrator assembly 4 fixed by the magnet fixing portion 50 and the clamping portion 55 is close to the left side wall 11 of the shell 1, and there is a vibration giving way gap between the mass block 40 and the left side wall 11. The elastic sheet 52 is close to the right side wall 11 of the shell 1, and the shell is fixed The upper surface of the portion 54 is welded and fixed to the inner surface of the bottom wall 10 between the connecting portion 51 and the elastic sheet 52; the width and weight of the mass block 40 on the right side of the through hole 400 are smaller than those of the mass block 40 on the left side, so as to achieve a higher swing frequency on the left side of the vibrator assembly 4. In order to prevent the vibrator assembly 4 with a larger amplitude from directly hitting the bottom wall 10 and the inner surfaces of the side wall 11 of the left shell 1 during the up and down swinging process, a first damping plate 6 is arranged on the left upper surface of the bottom wall 10 corresponding to the mass block 40, and a second damping plate 7 is arranged on the left outer surface of the side wall 11 corresponding to the mass block 40, thereby improving the vibration performance of the vibration motor.

[0032] The assembly steps of a cantilever wide-band vibration motor of the utility model are as follows:

[0033] First, the first damping sheet 6 and the first damping sheet 7 are respectively bonded and fixed to the bottom wall 10 and the side wall 11 on the left side of the housing 1;

[0034] Then, the coil 30 is bonded and fixed on the flexible circuit board 31 to form a stator assembly 3, and the stator assembly 3 is bonded and fixed on the cover plate 2:

[0035] Then, the magnet 41 is adapted and positioned with the magnet fixing portion 50 of the elastic member 5 and fixed by welding, and the magnet 41 is embedded in the through hole 401 of the mass block 40 until the clamping portion 55 of the elastic member 5 is clamped on the upper surface of the mass block 40, and the mass block 40 and the clamping portion 55 are fixed by welding;

[0036] Then, the housing fixing portion 54 of the elastic member 5 is fixed to the bottom wall 10 of the housing 1 by welding;

[0037] Finally, the housing 1 and the cover plate 2 are buckled and welded together.

[0038] The assembled cantilever broadband vibration motor utilizes the electromagnetic induction principle and the large magnet structure. The coil 30 is energized by an external power source through the flexible circuit board 31 of the stator assembly 3, thereby driving the vibrator assembly 4 equipped with the magnet 41 to perform reciprocating motion. The elastic member 5 adopts a cantilever spring, and deformation and rebound force are generated by the elastic sheet 52 and the elastic arm 53 on the right side of the elastic member 5. The weight of the left side of the mass block 40 is set to be greater than the weight on the right side. The vibrator assembly 4 fixed by the magnet fixing part 50 and the clamping part 55 on the left side of the elastic member 5 can achieve a larger swing on the left side, thereby allowing the vibration motor to produce a wider vibration frequency and a greater driving force, thereby meeting consumers' demand for a stronger vibration feeling.

[0039] It should be noted that, in the description of the present invention, the terms "up", "down", "front", "back", "left", "horizontal direction", "vertical direction" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0040] 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 cantilever wide-band vibration motor, comprising a housing with an accommodating space, a stator assembly, a vibrator assembly, an elastic member and a cover plate, wherein the vibrator assembly comprises a mass block and a magnet, the vibrator assembly is suspended in the accommodating space of the housing through the elastic member, the stator assembly comprises a ring coil and a flexible circuit board, the stator assembly is fixed on the cover plate, the housing is adapted to be buckled with the cover plate, and is characterized in that: The elastic part is punched out of a metal sheet in one piece, and includes a rectangular magnet fixing part, a clamping part formed by bending and extending in the same direction from the long edges on both sides and the short edge on the left side of the magnet fixing part toward the upper surface, a connecting part formed by bending and extending from the short edge on the right side of the magnet fixing part, an elastic sheet bent and extended vertically from the free end of the connecting part, an elastic arm formed by reverse punching from the center of the elastic sheet, and a shell fixing part formed by bending and extending vertically from the free end of the elastic arm, the magnet is welded and fixed to the lower surface of the magnet fixing part, and the shell fixing part is welded and fixed to the inner surface of the shell.

2. The cantilever wide-band vibration motor according to claim 1, characterized in that: The connecting portion is Type; the holding portion and the housing fixing portion are The magnet fixing portion, the upper surface of the holding portion, the upper surface of the connecting portion, the elastic sheet and the upper surface of the shell fixing portion are parallel and not in the same plane, and the free ends of the magnet fixing portion and the shell fixing portion are arranged in the same direction.

3. The cantilever wide-band vibration motor according to claim 2, characterized in that: The elastic sheet is square, the elastic arm is trapezoidal, the elastic sheet and the elastic arm are located in the same plane, the elastic sheet is connected to the right side of the elastic arm, and a gap is formed between the left side of the elastic sheet and the elastic arm.

4. The cantilever wide-band vibration motor according to claim 3, characterized in that: The elastic member includes the housing fixing portion, the connecting portion, the magnet fixing portion and the elastic sheet in order from top to bottom in the vertical direction.

5. The cantilever wide-band vibration motor according to claim 4, characterized in that: The width of the elastic sheet is greater than the width of the magnet fixing portion or the connecting portion.

6. The cantilever wide-band vibration motor according to claim 5, characterized in that: The mass block is provided with a through hole adapted to the magnet, the magnet fixing portion is embedded in the through hole, the clamping portion is clamped and fixed to the upper surface of the mass block at the outer edge of the through hole, and the lower surface of the mass block protrudes below the magnet.

7. The cantilever wide-band vibration motor according to claim 6, characterized in that: The width and weight of the mass block on the right side of the through hole are smaller than those of the mass block on the left side. The mass block on the right side of the through hole is placed in the bent connecting portion, and there is a gap between the right side surface of the mass block and the inner wall surface of the connecting portion.

8. The cantilever wide-band vibration motor according to claim 7, characterized in that: The magnet and the coil are spaced apart and adapted to each other, and the inner ring area of ​​the coil is larger than the flat area of ​​the magnet.

9. The cantilever wide-band vibration motor according to claim 8, characterized in that: The coil is located below the mass block.

10. The cantilever wide-band vibration motor according to claim 9, characterized in that: The shell includes a bottom wall and a side wall, the upper surface of the shell fixing part is welded and fixed to the inner surface of the bottom wall, the first damping plate is arranged on the left upper surface of the bottom wall corresponding to the mass block, and the second damping plate is arranged on the left outer surface of the side wall corresponding to the mass block.

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