CN211530982U

CN211530982U - Linear vibration motor

Info

Publication number: CN211530982U
Application number: CN201922453644.7U
Authority: CN
Inventors: 马杰; 李子昂
Original assignee: Ruisheng Technology Nanjing Co Ltd
Current assignee: Ruisheng Technology Nanjing Co Ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-09-18
Anticipated expiration: 2029-12-30

Abstract

The utility model provides a linear vibration motor, which comprises a shell, a vibration unit, an elastic component and a coil unit for driving the vibration unit to vibrate along a first direction, a second direction and a third direction; the vibration unit comprises a magnetic steel unit which is opposite to the coil unit at intervals, the magnetic steel unit comprises a first magnet part and a second magnet part which are magnetized along the magnetizing direction, and the magnetic poles of the first magnet part and the second magnet part are opposite; the interfaces of the first magnet part and the second magnet part form included angles of 90 degrees with the first direction, the coil units are respectively fixed on two opposite sides of the shell along the magnetizing direction, and the long axis or the short axis of each coil unit is parallel to the interfaces; each coil unit comprises an iron core and a coil wound on the outer side of the iron core. Compared with the prior art, the utility model discloses a linear vibration motor vibration performance is good and the reliability is high.

Description

Linear vibration motor

Technical Field

The utility model relates to a motor especially relates to a linear vibrating motor of application in mobile electronic product field.

Background

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 more and more sought after by people, and these electronic products generally use linear vibration motors to perform system feedback, such as incoming call prompt, information prompt, navigation prompt, vibration feedback of game consoles, and the like. Such a wide application requires a vibration motor having excellent performance and a long service life.

The linear vibration motor of the related art includes a base having an accommodating space, a vibration unit, an elastic member fixed to the base and suspending the vibration unit in the accommodating space, and a coil unit fixed to the base to drive the vibration unit to vibrate, and the vibration unit is driven to perform reciprocating linear motion to generate vibration by interaction of an electric field generated by the coil unit and a magnetic field generated by the vibration unit. In order to realize the bidirectional vibration effect, in the linear vibration motor in the related art, the magnetic steel extends along the diagonal direction of the base, the magnetic steel is obliquely magnetized, and the coil unit is vertically arranged in parallel with the side wall of the base.

However, in the linear vibration motor of the related art, the magnetic steel is obliquely magnetized, and the coil unit is disposed upright, so that the coil unit and the magnetic steel are not fully utilized, and thus the driving force formed by the coil unit and the magnetic steel is limited, resulting in poor vibration effect.

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

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that needs to solve provides a realize two-way vibration and the good linear vibrating motor of vibration performance.

In order to solve the above technical problem, the present invention provides a linear vibration motor, including a housing having an accommodation space, a vibration unit, an elastic member fixed to the housing and suspending the vibration unit in the accommodation space, and a coil unit fixed to the housing to drive the vibration unit to vibrate along a first direction, a second direction, or a third direction which is located on a plane formed by the first direction and the second direction and does not coincide with the first direction and the second direction, wherein the first direction and the second direction are perpendicular to each other; the vibration unit comprises a magnetic steel unit which is opposite to the coil unit at intervals and interacts with the coil unit to provide driving force, the magnetic steel unit comprises a first magnet part and a second magnet part which are magnetized along the magnetizing direction, the magnetic poles of the first magnet part and the second magnet part are opposite, and the magnetizing direction is perpendicular to a plane formed by the first direction and the second direction; the interface of the first magnet part and the second magnet part forms an included angle of not 90 degrees with the first direction; the coil unit comprises an iron core and a coil, wherein the iron core is fixed on the shell and positioned on at least one side of the vibration unit along the magnetizing direction, the coil is wound on the iron core, the coil is in a runway shape, and the long axis or the short axis of the coil is parallel to the interface.

Preferably, the iron core is strip-shaped, the length direction of the iron core is parallel to the long axis direction of the coil, and the thickness direction of the iron core is parallel to the magnetizing direction.

Preferably, the coil unit further includes a magnetic conductive sheet attached to one side of the coil, which is far away from the vibration unit, and the magnetic conductive sheet is connected to the iron core.

Preferably, the magnetic conductive sheet is provided with an abdicating opening extending inwards from the periphery of the magnetic conductive sheet, and the welding lead of the coil extends out of the abdicating opening.

Preferably, the vibration unit further comprises a mass block, the mass block is provided with a containing through hole penetrating through the mass block along the magnetizing direction, the magnetic steel unit is contained in the containing through hole and fixed, and the elastic assembly is connected with the mass block.

Preferably, the coil unit is partially located in the receiving through hole.

Preferably, the mass block has a rectangular structure including a short axis side parallel to the first direction and a long axis side parallel to the second direction; elastic component is including being located respectively the quality piece is followed the relative both sides of second direction, each elastic component is including being fixed in the casing is close to one of them minor axis limit one side and with the fixed arm that the quality piece interval set up, by the relative both ends of fixed arm are respectively along being close to adjacently the first bullet arm that the direction on minor axis limit was buckled and is extended, by first bullet arm is kept away from the one end of fixed arm is along being close to adjacently the second that the direction on major axis limit was buckled and is extended and be fixed in the quality piece the linking arm on major axis limit, the fixed arm with contained angle between the first bullet arm is the obtuse angle, first bullet arm with the second bullet arm all with the quality piece interval forms unsettled setting.

Preferably, the linear vibration motor further includes damping members interposed between the elastic member and corners of the mass block, and each of the damping members abuts against the first elastic arm and the second elastic arm adjacent to each other in the elastic member.

Preferably, the housing includes a bottom wall, a side wall bent and extended from an edge of the bottom wall, and a cover plate covering an end of the side wall away from the bottom wall, the side wall, and the cover plate enclose the accommodating space, the coil units are respectively fixed to the bottom wall and the cover plate, and distances from the elastic components to the cover plate are different.

Preferably, the linear vibration motor further comprises a limiting block fixed on the bottom wall and at least one of the cover plates, the limiting block comprises a limiting block body fixed on the casing and extending along the first direction and a limiting block extending body extending along the second direction, the mass block is provided with a limiting groove matched with the limiting block extending body, and the limiting block extending body extends into the limiting groove.

Preferably, the limiting block is located on one side, away from the fixed arm adjacent to the limiting block, of the mass block.

Compared with the prior art, the utility model discloses an among the linear vibration motor, coil unit sets up drive vibration unit along first direction, second direction vibration, or along being located the first direction with on the plane that the second direction formed and not with the first direction with the third direction vibration of second direction coincidence, vibration unit's magnet steel unit set up to magnetize along the direction of magnetizing and first magnet portion and second magnet portion that the magnetic pole is opposite, the direction of magnetizing perpendicular to first direction with the plane that the second direction formed, wherein, first magnet portion with the interface of second magnet portion with first direction forms the contained angle of non-90 degrees, and, makes major axis or minor axis of coil unit are on a parallel with the interface sets up. In the structure, the coil unit and the magnetic steel unit are fully utilized for interaction force between the coil unit and the magnetic steel unit, vibration in a first direction and a second direction which are orthogonal to each other or vibration in a third direction is realized, driving is large, and vibration performance is effectively improved.

Drawings

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

fig. 2 is an exploded view of a part of the three-dimensional structure of the linear vibration motor of the present invention;

fig. 3 is a partial perspective structural front view of the linear vibration motor of the present invention;

FIG. 4 is a front view of another part of the linear vibration motor of the present invention

FIG. 5 is a sectional view taken along line A-A of FIG. 1;

fig. 6 is a sectional view taken along line B-B in fig. 1.

Detailed Description

The present invention will be further explained with reference to the drawings and the embodiments.

The utility model provides a linear vibration motor 100, for convenient description explanation, establish XYZ triaxial coordinate system, as shown in FIG. 2, the definition is first direction along X axle direction, and the definition is the second direction along Y axle direction, and the definition is for magnetizing the direction along Z axle direction, and wherein first direction and second direction are two different vibration directions, the direction of magnetizing is linear vibration motor's thickness direction, then, first direction, second direction and two liang mutually perpendicular of the direction of magnetizing.

Referring to fig. 1 to 6, the linear vibration motor 100 includes a housing 1 having an accommodating space 10, a vibration unit 2 located in the accommodating space 10, an elastic component 3 fixed to the housing 1 and suspending the vibration unit 2 in the accommodating space 10, a coil unit 4 fixed to the housing 1 to drive the vibration unit 2 to vibrate along a first direction, a second direction, or a third direction that is located on a plane formed by the first direction and the second direction and does not coincide with the first direction and the second direction, a damping member 5 located in the accommodating space, and a limiting block 6.

The shell 1 comprises a bottom wall 11, a side wall 12 extending from the edge of the bottom wall 11 in a bending way, and a cover plate 13 covering one end of the side wall 12 far away from the bottom wall. The bottom wall 11, the side wall 12 and the cover plate 13 enclose the accommodating space 10. The vibration unit 2 includes a magnetic steel unit 21 and a mass block 22.

The magnetic steel unit 21 and the coil unit 4 are opposite at intervals and interact with each other to provide driving force.

Specifically, the magnetic steel unit 21 at least includes two parts with opposite magnetic pole directions, for example, in the present embodiment, the magnetic steel unit 21 includes a first magnet portion 211 and a second magnet portion 212 magnetized along the magnetization direction, and the magnetic poles of the first magnet portion 211 and the second magnet portion 212 are opposite, that is, the magnetization direction of the magnetic steel unit 21 is the thickness direction of the linear vibration motor 100, and the direction is perpendicular to a plane formed by the first direction and the second direction. The interface 213 between the first magnet portion 211 and the second magnet portion 212 forms an angle different from 90 degrees with the first direction, or forms an angle different from 90 degrees with the second direction.

The mass 22 is used to increase the weight of the vibration unit 2 and improve the vibration performance. In this embodiment, the mass block 22 is provided with an accommodating through hole 221 penetrating through the mass block in the magnetizing direction, the magnetic steel unit 21 is accommodated in the accommodating through hole 221 and fixed, the elastic component 3 is connected with the mass block 22, and the vibration unit 2 is suspended in the accommodating space 10 by being fixed with the mass block 22.

In this embodiment, the mass 22 has a rectangular structure, and includes a short axis parallel to the first direction and a long axis parallel to the second direction.

The elastic components 3 are oppositely arranged on two opposite sides of the mass block 22. In this embodiment, the elastic elements 3 include two elastic elements 3 respectively located at two opposite sides of the mass parallel to the short axis thereof, i.e. at two opposite sides of the mass 22 along the second direction.

Specifically, each of the elastic assemblies 3 includes a fixed arm 31 fixed to one side of the housing 1 near one of the short axis sides and connected to the mass 22, a first elastic arm 32 bent and extended from opposite ends of the fixed arm 31 respectively in a direction near the adjacent short axis side, a second elastic arm 33 bent and extended from one end of the first elastic arm 32 far from the fixed arm 31 in a direction near the adjacent long axis side, and a connecting arm 34 extended from the second elastic arm 33 and fixed to the long axis side of the mass 22. An included angle between the fixed arm 31 and the first elastic arm 32 is an obtuse angle, and the first elastic arm 32 and the second elastic arm 33 are spaced from the mass block 22 to form a suspension arrangement. The distance between each elastic component 3 and the cover plate 13 is different.

The coil unit 4 includes an iron core 41 fixed to the housing 1 and located on at least one side of the vibration unit 2 in the magnetizing direction (Z-axis direction), and a coil 42 wound around the iron core 41.

Specifically, the coil unit 4 is fixed to the bottom wall 11 and the cover plate 13, respectively.

In the present embodiment, the coil units 4 include two coil units and are respectively fixed to two opposite sides of the housing 1 along the magnetizing direction (Z-axis direction).

Specifically, the iron core 41 is strip-shaped, the coil 42 is racetrack-shaped, and the long axis or the short axis of the coil 42 is parallel to the interface. The length direction of the iron core 41 is parallel to the long axis direction of the coil 42, and the thickness direction of the iron core 41 is parallel to the magnetizing direction.

Preferably, in order to reduce the thickness of the linear vibration motor 100 and make the design thinner, the coil unit 4 is partially located in the receiving through hole 221.

In this embodiment, in order to reduce magnetic leakage, the coil unit 4 further includes a magnetic conductive sheet 43 attached to one side of the coil 42, which is far away from the vibration unit 2, and the magnetic conductive sheet 43 is connected to the iron core 41. The coil unit 4 is fixed to the housing 1 by a magnetic conductive sheet 43.

Preferably, the magnetic conductive sheet 43 is provided with a recess 431 extending inward from the periphery thereof, and the welding lead of the coil 42 extends out through the recess 431 and is led to an external power supply by an FPC.

The damper 5 is interposed between the elastic member 3 and a corner of the mass 22.

The damping members 5 include four and are respectively located at four corners of the mass block 22. Each of the damping members 5 abuts against the adjacent first elastic arm 32 and the second elastic arm 33 in the corresponding elastic assembly 3. That is, the damping member 5 has a portion contacting the mass 22 and the elastic component 3 in the first direction and the second direction, so as to provide damping when the mass 22 moves in the first direction (X-axis direction), the second direction (Y-axis direction) or the third direction (direction on a plane formed by the X-axis and the Y-axis and not coinciding with the X-axis and the Y-axis), thereby improving stability and reliability thereof.

The limiting block 6 is fixed on at least one of the bottom wall 11 and the cover plate 13. The limiting block 6 is located on one side of the short shaft side far away from the fixing arm 31 adjacent to the limiting block 6.

In this embodiment, the two limiting blocks 6 are respectively disposed on two opposite sides of the short axis of the mass block 22, and are used for limiting the vibration unit 22 in the first direction, the second direction and the third direction, so as to improve the reliability of the vibration unit.

Specifically, the stopper 6 includes a stopper body 61 fixed to the housing 1 and extending in the first direction, and a stopper extending body 62 extending from the stopper body 61 in the second direction, for example, forming a "T" shape. The mass block 22 is provided with a limiting groove 222 matched with the limiting block extending body 62, and the limiting block extending body 62 extends into the limiting groove 222. The stopper body 61 then realizes that the displacement when vibrating unit 2 vibrates along the second direction is spacing, and stopper extension body 62 then realizes that the displacement when vibrating unit 2 vibrates along the first direction is spacing, and stopper body 61 realizes jointly with stopper extension body 62 that the displacement when vibrating unit 2 vibrates along the third direction is spacing.

Preferably, in order to further reduce the size of the linear vibration motor 100 in the magnetizing direction (the thickness direction thereof, i.e., the Z-axis direction), it is reduced in thickness. In this embodiment, two elastic assemblies 3 are stacked in the magnetizing direction, two stopper bodies 61 of the stoppers 6 are fixed to the casing 1 along the opposite sides of the magnetizing direction, and two stopper grooves 222 are respectively formed in the opposite sides of the mass block 22 along the strong magnetizing direction. Therefore, in the magnetizing direction, the thickness space of the mass block 22 along the magnetizing direction is fully utilized by the limiting block 6 and the elastic component 3.

As shown in fig. 5, when the coil 42 is energized, the energized coil 42 cuts the magnetic induction line to form an ampere force, and at the same time, the iron cores 41 have a polarity after being polarized due to the energization of the coil 42, and the two iron cores 41 of the two coil units 4 respectively act on the magnetic steel unit 21 to form an electromagnetic force; the ampere force, in combination with the electromagnetic force, creates a driving force normal to interface 213, as shown in fig. 4. The driving force has driving force components in a first direction and a second direction to provide driving force for vibrations in the first direction, the second direction, and a third direction that is located on a plane formed by the first direction and the second direction and does not coincide with the first direction and the second direction, and when a frequency of a current (i.e., a frequency of a driving signal) is close to a resonant frequency of the linear vibration motor 100 in the first direction or the second direction, a mode in the first direction or the second direction is excited to form a main movement direction. When the frequency of the driving signal corresponds to the resonant frequency of the first direction and the resonant frequency of the second direction at the same time, the vibration unit 2 is excited in the first direction (X) and the second vibration (Y) mode at the same time, and at this time, the vibration unit 2 vibrates in the third direction under the action of a resultant force.

And above-mentioned structure sets up the interact that has utilized coil unit 4 and magnet steel unit 21 of very big degree, and the effectual drive power that has improved the vibration performance.

It should be understood that the shapes of the mass, the core, and other components described above are only examples, and are not limited to the present invention, and the core may also be cylindrical or other shapes, and the mass may also be circular, square, or other regular or irregular shapes as long as the mass can fix the magnet portion and connect with the elastic component. Compared with the prior art, the utility model discloses an among the linear vibration motor, coil unit sets up drive vibration unit along first direction, second direction vibration, or along being located the first direction with on the plane that the second direction formed and not with the first direction with the third direction vibration of second direction coincidence, vibration unit's magnet steel unit set up to magnetize along the direction of magnetizing and first magnet portion and second magnet portion that the magnetic pole is opposite, the direction of magnetizing perpendicular to first direction with the plane that the second direction formed, wherein, first magnet portion with the interface of second magnet portion with first direction forms the contained angle of non-90 degrees, and, makes major axis or minor axis of coil unit are on a parallel with the interface sets up. In the structure, the coil unit and the magnetic steel unit are fully utilized for interaction force between the coil unit and the magnetic steel unit, vibration in a first direction and a second direction which are orthogonal to each other or vibration in a third direction is realized, driving is large, and vibration performance is effectively improved.

The above only is the embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent processes of the present invention are used in the specification and the attached drawings, or directly or indirectly applied to other related technical fields, and the same principle is included in the protection scope of the present invention.

Claims

1. A linear vibration motor including a housing having an accommodation space, a vibration unit, an elastic member fixed to the housing and suspending the vibration unit in the accommodation space, and a coil unit fixed to the housing to drive the vibration unit to vibrate in a first direction, a second direction, or a third direction that is located on a plane formed by the first direction and the second direction and that does not coincide with the first direction and the second direction, the first direction and the second direction being perpendicular to each other, characterized in that:

the vibration unit comprises a magnetic steel unit which is opposite to the coil unit at intervals and interacts with the coil unit to provide driving force, the magnetic steel unit comprises a first magnet part and a second magnet part which are magnetized along the magnetizing direction, the magnetic poles of the first magnet part and the second magnet part are opposite, and the magnetizing direction is perpendicular to a plane formed by the first direction and the second direction; the interface of the first magnet part and the second magnet part forms an included angle of not 90 degrees with the first direction;

the coil unit comprises an iron core and a coil, wherein the iron core is fixed on the shell and positioned on at least one side of the vibration unit along the magnetizing direction, the coil is wound on the iron core, the coil is in a runway shape, and the long axis or the short axis of the coil is parallel to the interface.

2. The linear vibration motor according to claim 1, wherein the iron core has a bar shape, a length direction of the iron core is parallel to a long axis direction of the coil, and a thickness direction of the iron core is parallel to the magnetizing direction.

3. The linear vibration motor according to claim 1 or 2, wherein the coil unit further includes a magnetic conductive plate attached to a side of the coil away from the vibration unit, the magnetic conductive plate being connected to the core.

4. The linear vibration motor of claim 3, wherein the magnetic conductive plate is provided with a relief opening extending inward from a periphery thereof, through which a welding lead of the coil protrudes.

5. The linear vibration motor of claim 1, wherein the vibration unit further comprises a mass block, the mass block is provided with a receiving through hole penetrating through the mass block along the magnetizing direction, the magnetic steel unit is received in the receiving through hole and fixed, and the elastic component is connected with the mass block.

6. The linear vibration motor according to claim 5, wherein the coil unit is partially located in the housing through hole.

7. The linear vibration motor of claim 5, wherein the mass has a rectangular structure including a short axis side parallel to the first direction and a long axis side parallel to the second direction; elastic component is located respectively the quality piece is followed the relative both sides of second direction, each elastic component is including being fixed in the casing is close to one of them minor axis limit one side and with the fixed arm that the quality piece interval set up, by the relative both ends of fixed arm are respectively along being close to adjacently the first bullet arm that the direction on minor axis limit was buckled and is extended, by first bullet arm is kept away from the one end of fixed arm is along being close to adjacently the second that the direction on major axis limit was buckled and is extended and be fixed in the quality piece the linking arm on major axis limit, the fixed arm with contained angle between the first bullet arm is the obtuse angle, first bullet arm with the second bullet arm all with the quality piece interval forms unsettled setting.

8. The linear vibration motor according to claim 7, further comprising damping members interposed between the elastic member and corners of the mass, each of the damping members abutting against the first and second elastic arms adjacent to each other in the corresponding elastic member.

9. The linear vibration motor of claim 7, wherein the housing includes a bottom wall, a side wall extending from an edge of the bottom wall, and a cover plate covering an end of the side wall away from the bottom wall, the side wall, and the cover plate enclose the receiving space, the coil units are fixed to the bottom wall and the cover plate, respectively, and distances between the elastic components and the cover plate are different.

10. The linear vibration motor of claim 9, further comprising a stopper fixed to at least one of the bottom wall and the cover plate, wherein the stopper includes a stopper body fixed to the housing and extending in the first direction and a stopper extension body extending from the stopper body in the second direction, the mass block is provided with a stopper groove engaged with the stopper extension body, and the stopper extension body extends into the stopper groove.

11. The linear vibration motor of claim 10, wherein the stopper is located on a side of the short axis side away from the fixed arm adjacent to the stopper.