CN212381093U

CN212381093U - Linear vibration motor

Info

Publication number: CN212381093U
Application number: CN202021221436.0U
Authority: CN
Inventors: 陶锋; 凌芳华; 浦晓峰
Original assignee: AAC Optoelectronic Changzhou Co Ltd
Current assignee: AAC Optoelectronic Changzhou Co Ltd
Priority date: 2020-06-28
Filing date: 2020-06-28
Publication date: 2021-01-19
Anticipated expiration: 2030-06-28
Also published as: WO2022000643A1

Abstract

The utility model provides a linear vibration motor, which comprises an outer shell, the coil pack, vibration unit and elastic support piece, the shell has the bottom plate, the vibration unit is including the quality piece that has the accepting hole and be fixed in the accepting hole and the interval sets up the magnetic circuit structure who is formed with the magnetic gap, the coil pack is located the magnetic gap and vibrates with the drive vibration unit along the vibration direction that is on a parallel with the bottom plate with magnetic circuit structure interact, the quality piece is including enclosing the pore wall of establishing into the accepting hole and the surface relative with the pore wall, magnetic circuit structure locates the utmost point core of pore wall and pastes the magnet steel of locating utmost point core and setting up relatively with the coil pack including pasting, the flat portion of coil pack one side is kept away from to utmost point core including flat pasting in the magnet steel, flat portion is provided with the constant head tank along being on a. Compared with the prior art, the utility model provides a linear vibrating motor can improve the positioning accuracy of utmost point core, reduce the process assembly degree of difficulty and improve the concentricity of magnet and utmost point core.

Description

Linear vibration motor

[ technical field ] A method for producing a semiconductor device

The utility model relates to a vibrating motor field especially relates to a linear vibrating motor for on portable consumer electronics.

[ background of the invention ]

With the development of electronic technology, portable consumer electronic products, such as mobile phones, handheld game consoles, navigation devices or handheld multimedia entertainment devices, are increasingly popular with people, and these electronic products generally use a vibration motor to perform system feedback, such as incoming call prompt, information prompt, navigation prompt, vibration feedback of game consoles, and the like.

In the related art, the linear vibration motor includes a housing, a coil assembly accommodated in the housing, a vibration unit, and an elastic supporting member supporting the vibration unit, wherein the vibration unit includes a mass block having an accommodating hole and a magnetic circuit structure fixedly disposed on a hole wall of the accommodating hole, the coil assembly and the magnetic circuit structure interact with each other to drive the vibration unit to vibrate along a length direction of the housing, the magnetic circuit structure includes a pole core fixed on the hole wall, a first magnet fixed on one side of the pole core facing the coil assembly, a second pole core fixed on a second hole wall, and a magnetic steel fixed on one side of the second pole core facing the coil assembly, and the pole core is in a flat plate shape. However, in the assembly process of the linear vibration motor, the pole core and the pole core are positioned with the mass block through the shape matching of the pole core and the mass block, and the positioning in the positioning mode easily causes the problems of low positioning precision of the pole core and low concentricity of the pole core and the magnet of the assembled linear vibration motor.

Therefore, it is necessary to provide a new linear vibration motor to solve the above problems.

[ Utility model ] content

An object of the utility model is to provide a linear vibration motor, this linear vibration motor can improve the positioning accuracy of utmost point core, reduce the process assembly degree of difficulty and improve the concentricity of magnet and utmost point core.

The utility model provides a linear vibration motor, including the shell and accommodate coil pack, vibration unit and the support of the shell in the vibration unit, the shell has the bottom plate of fixing the coil pack, the vibration unit includes the quality piece that has the accepting hole and is fixed in the accepting hole and the interval sets up the magnetic circuit structure that is formed with the magnetic gap, the coil pack is located in the magnetic gap and with the magnetic circuit structure interact is used for driving the vibration unit along being on a parallel with the vibration direction vibration of bottom plate, the quality piece includes the pore wall that encloses into the accepting hole and the surface relative with the pore wall, the magnetic circuit structure includes the pole piece that pastes in the pore wall and pastes in the pole piece and the magnet steel that sets up relative with the coil pack, the pole piece includes the flat portion that flat subsides in the magnet steel keeps away from one side of the coil pack, the flat portion is provided with the constant head tank along being on a parallel with relative both ends in the bottom plate direction, just the constant head tank is close to the bottom plate.

Preferably, the mass block further comprises a groove recessed from the hole wall to the outer surface, the groove comprises a bottom wall parallel to and opposite to the outer surface and a side wall connecting the bottom wall and the hole wall, and the flat portion is flatly attached to the bottom wall.

Preferably, the pole core further includes a bending portion extending from the flat portion to the coil assembly in a bending manner, the bending portion being close to the opposite ends of the side wall, and the bending portion is flatly attached to the side wall and extends beyond the groove.

Preferably, the pole core further includes an extension portion extending from the bent portion along the hole wall in a bent manner, and the extension portion is flush with the hole wall.

Preferably, the bending part is perpendicular to the flat part and the extending part.

Preferably, the hole walls include a pair of first hole walls spaced apart along a short axis side of the mass block and a pair of second hole walls spaced apart along a long axis side of the mass block, the pair of first hole walls are respectively formed with a recess in a recessed manner, the pair of recesses respectively accommodate the pole cores therein, and the long axis side of the mass block extends along the vibration direction.

Preferably, the pole core is formed by punching and molding a magnetic conduction plate.

Preferably, the coil assembly includes a core and a coil wound around an outer periphery of the core, and an axis of the coil extends in the vibration direction.

Preferably, the core includes the main part and sets firmly in the stiff end at the both ends of main part, the winding is located to the coil on the main part, the stiff end is fixed on the bottom plate.

Preferably, the core is an iron core.

Compared with the prior art, the utility model provides a linear vibrating motor is through set up the constant head tank on the utmost point core, during the equipment, the location frock inserts the constant head tank is in order to realize the location between utmost point core and the quality piece to can improve the positioning accuracy of utmost point core, reduce the process assembly degree of difficulty and improve the concentricity of magnet and utmost point core.

[ description of the drawings ]

Fig. 1 is a schematic perspective exploded view of a linear vibration motor according to a first embodiment of the present invention;

fig. 2 is a partially exploded schematic view of the linear vibration motor shown in fig. 1

Fig. 3 is an assembled perspective view of the linear vibration motor shown in fig. 1;

fig. 4 is a sectional view of the linear vibration motor shown in fig. 3 taken along line a-a;

fig. 5 is a schematic structural view of a mass block in the linear vibration motor shown in fig. 4;

fig. 6 is a sectional view of the linear vibration motor shown in fig. 3 taken along the line B-B;

fig. 7 is a schematic structural diagram of a second embodiment of a linear vibration motor according to the present invention;

fig. 8 is a schematic structural diagram of a second embodiment of a linear vibration motor according to the present invention.

[ detailed description ] embodiments

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example one

As shown in fig. 1 to 6, the linear vibration motor includes a housing 1, and a coil block 2, a vibration unit 3, and an elastic support 4 supporting the vibration unit 3, which are accommodated in the housing 1.

The shell 1 is rectangular, and the shell 1 comprises a shell body 11 and a bottom plate 13 which is assembled with the shell body 11 to form an accommodating space 1B. The coil block 2 is fixed to the base plate 13.

The coil assembly 2 includes a core 21 and a coil 23 wound around the periphery of the core 21, wherein an axial direction of the coil 23 is a vibration direction of the vibration unit 3, and the vibration direction is parallel to the bottom plate 13.

The core body 21 may be columnar or "i" shaped. In this embodiment, the core body 21 is in an "i" shape, and includes a main body portion 211 and fixing ends 213 fixedly disposed at two ends of the main body portion 211, the coil 23 is disposed and wound on the main body portion 211, and the coil assembly 2 is fixed on the bottom plate 13 through the fixing ends 213.

In the present embodiment, the core 21 is an iron core. When the coil 23 is energized, the core 21 is magnetized by the magnetic field of the coil 23, and the magnetized core 21 becomes a magnet whose magnetic field and the magnetic field of the coil 23 are superimposed on each other, so that the magnetic force of the coil block 2 is increased.

The coil 23 is electrically connected to an external power source through the circuit board 5. As shown in fig. 3 and 6, the circuit board 5 is fixed on the bottom plate 13, and one end thereof extends out of the accommodating space 1B to be electrically connected with an external circuit.

The vibration unit 3 comprises a mass 31 having a receiving hole 3A and a magnetic structure 33 fixed in the receiving hole 3A and spaced apart from the receiving hole 3A to form a magnetic gap 3B, and the coil assembly 2 is located in the magnetic gap 3B and interacts with the magnetic structure 33 to drive the vibration unit 3 to vibrate along the vibration direction.

The mass block 31 includes a hole wall 35 enclosing the accommodating hole 3A, an outer surface 37 opposite to the hole wall 35, and a groove 39 recessed from the hole wall 35 toward the outer surface 37.

The hole walls 35 include a pair of first hole walls 351 spaced along a short-axis side of the mass 31 and a pair of second hole walls 353 spaced along a long-axis side of the mass 31, wherein the long axis side of the mass 31 extends in the vibration direction. As shown in fig. 5, the pair of first hole walls 351 are each formed with the concave groove 39.

The groove 39 includes a bottom wall 391 opposite and parallel to the outer surface 37 and a side wall 393 connecting the bottom wall 391 and the aperture wall 35. Specifically, the side wall 393 connects the bottom wall 391 and the first aperture wall 351.

The magnetic structure 33 includes a pole core 331 attached to the hole wall 35, and a magnetic steel 333 attached to the pole core 331 and disposed opposite to the coil assembly 2.

As shown in fig. 1 and 4, the number of the pole cores 331 is four, and the four pole cores 331 are a pair of first pole cores 331a spaced along the minor axis of the mass block 31 and a pair of second pole cores 331b spaced along the major axis of the mass block 31, respectively, wherein the recess 39 receives the first pole cores 331 a. By arranging the groove 39 matched with the pole core 331 on the hole wall 35, the assembling difficulty of parts (pole core and magnetic steel) can be reduced and the assembling precision can be improved under the condition of ensuring the magnetic circuit performance, and the wall thickness of the mass block 31 can be increased and the weight of the mass block 31 can be increased under the condition of not sacrificing the volume of the accommodating hole, so that the risk of fracture when the mass block 31 falls can be reduced.

The first pole piece 331a and the second pole piece 331b each include a flat portion 335 flatly attached to one side of the magnetic steel 333 away from the coil component 2, the flat portion 335 flatly attached to the bottom wall 391, and positioning grooves a are provided at two opposite ends of the flat portion 335 in a direction parallel to the bottom plate 13, and the positioning grooves a are close to the bottom plate 13.

The first pole piece 331a further includes a bent portion 337 bent and extended from the flat portion 335 near the opposite ends of the hole wall 35 toward the coil assembly 2, and an extended portion 339 bent and extended from the bent portion 337 along the hole wall 35, wherein the bent portion 337 is flush with the side wall 393 and does not extend beyond the groove 39, and the extended portion 339 is flush with the first hole wall 351 of the hole wall 35.

As shown in fig. 4, the bent portion 337 is perpendicular to the flat portion 335 and the extended portion 339.

In this embodiment, the pole piece 331 is formed by punching a magnetic conductive plate.

The four magnetic steels 333 are a pair of first magnetic steels 333a arranged along the short axis side of the mass block 31 at intervals, and a pair of second magnetic steels 333b arranged along the long axis side of the mass block 31 at intervals.

Wherein, the polarity direction of the first magnetic steel 333a is arranged along the short axis side of the mass block 31, and the polarity directions of the two first magnetic steels 333a are opposite, when the coil 23 is energized, the core body 21 has two magnetic poles (N pole and S pole) distributed along the long axis side (i.e. the vibration direction) of the mass block 31, so that the coil assembly 2 and the first magnetic steel 333a of the magnetic circuit structure 33 can interact to drive the vibration unit 3 to vibrate along the vibration direction; the polarity direction of the second magnetic steel 333b is arranged along the long axis side of the mass block 31 (i.e. the vibration direction), and the two second magnetic steels 333b are arranged in opposite homopolarity, so that the coil assembly 2 interacts with the first magnetic steel 333a and the second magnetic steel 333b of the magnetic circuit structure 33 to realize the fast reaction of the vibration motor. As shown in fig. 4, one side of the first magnetic steel 333a close to the first pole core 331a is an S pole, and one side close to the coil assembly 2 is an N pole; one side of the second magnetic steel 333b close to the second pole core 331b is an N pole, and one side thereof close to the coil component 2 is an S pole.

It is understood that, in other embodiments, the second hole wall 353 may also be recessed to form the groove, and further, the second pole piece 331b may also be configured to include a flat portion 335, a bent portion 337 and an extending portion 339.

The elastic supporting members 4 are respectively disposed at opposite sides of the vibration unit 3 along the vibration direction thereof. The elastic supporting pieces 4 are U-shaped springs, and the opening directions of the two elastic supporting pieces 4 are opposite.

The elastic supporting member 4 includes a first fixing portion 41 connected to the mass block 311, a second fixing portion 43 connected to the housing 1, and a deformation portion 45 connecting the first fixing portion 41 and the second fixing portion 43, wherein the second fixing portion 43 and the first fixing portion 41 are disposed at an interval along a short axis of the mass block 31.

Buffer sheets 6 are disposed between the first fixing portion 41 and the housing 1 and between the second fixing portion 43 and the mass block 31. Wherein, the buffer sheet 6 can be made of foam, rubber, silicon and the like. The buffer sheet 6 may prevent the elastic support 4 from colliding with the housing 1 and the mass block 31 of the vibration unit 3 during vibration of the vibration unit 3, thereby improving reliability of a product.

Example two

Fig. 7 is a schematic structural diagram of a linear vibration motor 200 in a second embodiment, which is substantially the same as the first embodiment, and the symbol meanings in the following list are also the same as those in the first embodiment, so that the description of the same parts is omitted here, and only different points are listed below.

In this embodiment, the first pole piece 331a only includes a flat portion 335 and bending portions 337 respectively bent and extended from the flat portion 335 near opposite ends of the hole wall 35 toward the coil assembly 2, but does not include an extended portion.

EXAMPLE III

Fig. 8 is a schematic structural diagram of a linear vibration motor 300 according to a third embodiment, which is substantially the same as the first embodiment, and the symbol meanings in the following list are also the same as those in the first embodiment, so that the description of the same parts is omitted here, and only different points are listed below.

In the present embodiment, the first pole piece 331a includes only the flat portion 335, and does not include the bent portion and the extended portion.

In addition, compared to the first pole piece 331a in the third embodiment (the first pole piece 331a includes only the flat portion 335), in both the first and second embodiments, the pole piece is configured to include the flat portion 335 and the bent portions 337 bent and extended from the flat portion 335 to the opposite ends of the hole wall 35 toward the coil assembly 2, that is, the magnetic induction intensity of the pole piece 331 in the vicinity of the bent portion 337 at the flat portion 335 and the bent portion 337 can be increased by the pole piece 331 bending process (that is, the magnetic flux in the magnetic gap 3B can be increased by the pole piece 331 bending process), so that the transient vibration performance can be improved (the larger the magnetic flux is, the shorter the start and braking time of the vibration unit is). Compared with the pole core of the second embodiment, the pole core of the first embodiment is further provided with the extending part 339 which is bent and extended from the bent part 337, and the arrangement of the extending part 339 can further improve the magnetic flux in the magnetic gap 3B, so that the starting and braking time of the linear vibration motor of the first embodiment is shorter than that of the linear vibration motor of the second embodiment; on the other hand, the vibration unit (the vibration unit includes the pole core) of the second embodiment has a larger acceleration root mean square value (Grms) than the vibration unit (the vibration unit includes the pole core) of the first embodiment, the magnitude of the acceleration root mean square value (Grms) mainly affects the steady-state performance of the linear vibration motor, and the larger the acceleration root mean square value (Grms), the stronger the vibration feeling of the linear vibration motor is.

The utility model provides a linear vibrating motor passes through set up constant head tank a on the utmost point core 331, during the equipment, the location frock inserts constant head tank a is in order to realize the location between utmost point core and the quality piece to can improve the positioning accuracy of utmost point core, reduce the process assembly degree of difficulty and improve the concentricity of magnet and utmost point core.

The above embodiments of the present invention are only described, and it should be noted that, for those skilled in the art, modifications can be made without departing from the inventive concept, but these all fall into the protection scope of the present invention.

Claims

1. A linear vibration motor comprises a shell, a coil assembly, a vibration unit and an elastic support member, wherein the coil assembly, the vibration unit and the elastic support member are accommodated in the shell, the shell is provided with a bottom plate for fixing the coil assembly, the vibration unit comprises a mass block with an accommodating hole and a magnetic circuit structure which is fixed in the accommodating hole and is provided with magnetic gaps at intervals, the coil assembly is positioned in the magnetic gaps and interacts with the magnetic circuit structure to drive the vibration unit to vibrate along a vibration direction parallel to the bottom plate, the mass block comprises a hole wall and an outer surface, the hole wall is enclosed into the accommodating hole, the outer surface is opposite to the hole wall, the magnetic circuit structure comprises a pole core and a magnetic steel, the pole core is attached to the hole wall, and the magnetic steel is attached to the pole core and is opposite to the coil assembly, and: the pole piece is including the subsides flatly in the magnet steel is kept away from the flat portion of coil pack one side, flat portion is along being on a parallel with relative both ends in the bottom plate direction are provided with the constant head tank, just the constant head tank is close to the bottom plate.

2. The linear vibration motor according to claim 1, characterized in that: the mass block further comprises a groove which is sunken from the hole wall to the outer surface, the groove comprises a bottom wall which is parallel and opposite to the outer surface and a side wall which is connected with the bottom wall and the hole wall, and the flat part is flatly attached to the bottom wall.

3. The linear vibration motor according to claim 2, wherein: the pole core further comprises bending parts which are bent and extended from the two opposite ends of the flat part close to the side wall to the coil assembly respectively, and the bending parts are flatly attached to the side wall and extend out of the groove.

4. The linear vibration motor according to claim 3, wherein: the pole core further comprises an extending part which extends along the hole wall from the bending part in a bending mode, and the extending part is flatly attached to the hole wall.

5. The linear vibration motor according to claim 4, wherein: the bending part is perpendicular to the flat part and the extending part.

6. The linear vibration motor according to any one of claims 2 to 5, wherein: the hole walls comprise a pair of first hole walls arranged at intervals along the short axis side of the mass block and a pair of second hole walls arranged at intervals along the long axis side of the mass block, the pair of first hole walls are respectively sunken to form grooves, the pair of grooves are respectively accommodated with the pole cores, and the long axis side of the mass block extends along the vibration direction.

7. The linear vibration motor according to any one of claims 3 to 5, wherein: the pole core is formed by punching the magnetic conduction plate.

8. The linear vibration motor according to claim 1, characterized in that: the coil assembly comprises a core body and a coil wound on the periphery of the core body, and the axis of the coil extends along the vibration direction.

9. The linear vibration motor according to claim 8, wherein: the core includes the main part and sets firmly in the stiff end at the both ends of main part, the winding is located to the coil on the main part, the stiff end is fixed on the bottom plate.

10. The linear vibration motor according to claim 8 or 9, characterized in that: the core body is an iron core.