CN211744311U

CN211744311U - Linear vibration motor

Info

Publication number: CN211744311U
Application number: CN201922341432.XU
Authority: CN
Inventors: 凌芳华; 浦晓峰; 张玉林; 周晓荣
Original assignee: AAC Technologies Pte Ltd
Current assignee: AAC Technologies Pte Ltd
Priority date: 2019-12-23
Filing date: 2019-12-23
Publication date: 2020-10-23
Anticipated expiration: 2029-12-23

Abstract

The utility model provides a linear vibration motor, which comprises a guide shell, a vibration unit, a coil unit, an auxiliary magnetic steel unit and a conductive damping unit, wherein the guide shell comprises a body and a guide channel penetrating through the body; the vibration unit is accommodated in the guide channel and forms sliding connection, and comprises a magnetic steel unit; the coil unit is sleeved outside the guide shell and used for driving the vibration unit to vibrate along the axial direction of the guide channel; the auxiliary magnetic steel unit is fixed on the guide shell and is arranged at intervals with the vibration unit; the conductive damping units comprise two groups, are fixed on the guide shell and are respectively positioned at two opposite ends of the coil unit along the vibration direction of the vibration unit; the auxiliary magnetic steel unit is positioned in the magnetic field of the magnetic steel unit to generate vibration restoring force for restoring the vibration displacement of the vibration unit, and the conductive damping unit is positioned in the magnetic field of the magnetic steel unit to generate damping force for blocking the movement of the vibration unit. Compared with the prior art, the utility model discloses a linear vibration motor vibration performance is good.

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.

A linear vibration motor of the related art includes a base having an accommodating space, a vibration unit, an elastic member or a bearing 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 a reciprocating linear motion to generate vibration by an interaction between an electric field generated by the coil unit and a magnetic field generated by the vibration unit.

However, in the linear vibration motor of the related art, when the supporting vibration unit uses the metal elastic component, the elastic component has a small vibration displacement, and cannot provide more vibration experience.

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 linear vibrating motor that the assembly is simple, vibration performance is good, and the reliability is high.

In order to solve the above technical problem, the utility model provides a linear vibration motor, it includes:

a guide housing including a body and a guide passage extending through the body;

the vibration unit is accommodated in the guide channel and forms sliding connection, and comprises a magnetic steel unit;

the coil unit is sleeved on the outer side of the guide shell and used for driving the vibration unit to vibrate along the axial direction of the guide channel;

an auxiliary magnetic steel unit fixed to the guide housing and spaced from the vibration unit, the auxiliary magnetic steel unit being located in a magnetic field of the magnetic steel unit to generate a vibration restoring force for restoring a vibration displacement of the vibration unit, and,

the conductive damping unit, the conductive damping unit includes two sets ofly, and is two sets of the conductive damping unit is fixed in respectively the direction casing, and follows the vibration direction of vibration unit is located respectively the relative both ends of coil unit, the conductive damping unit is located in order to produce the hindrance in the magnetic field of magnet steel unit the damping force of vibration unit motion.

Preferably, the supplementary magnet steel unit includes two sets ofly, and follows the vibration direction of vibration unit is located respectively the relative both ends of coil unit, each group supplementary magnet steel unit includes two supplementary magnet steels, and follows the perpendicular to the vibration direction is fixed in respectively the relative both sides of direction casing.

Preferably, each group of the conductive damping units comprises two conductive damping monomers which are oppositely arranged; the two conductive damping monomers are respectively fixed on two opposite sides of the guide shell along the direction perpendicular to the vibration direction.

Preferably, the two auxiliary magnetic steels of the same group of auxiliary magnetic steel units are respectively embedded in the two conductive damping units of the same group of conductive damping units.

Preferably, the same group of the two conductive damping units are respectively located on two opposite sides of the guide shell, and the same group of the two auxiliary magnetic steels 1 of the auxiliary magnetic steel units are respectively fixed on the other opposite sides of the guide shell.

Preferably, the two groups of conductive damping units are respectively attached and fixed to two opposite sides of the guide shell along the vibration direction of the vibration unit and at least partially cover the guide channel.

Preferably, the magnetic steel unit comprises magnetic steel and a soft magnetic block attached to the magnetic pole of the magnetic steel.

Preferably, the magnetic steels comprise two, and the soft magnetic blocks are clamped and fixed between the two magnetic steels.

Preferably, the vibration unit further comprises a mass block, and the mass block is attached to one side, away from the soft magnetic block, of the magnetic steel along the vibration direction.

Preferably, the magnetizing directions of the two magnetic steels are both parallel to the vibration direction, and the magnetizing directions are opposite; the magnetizing directions of the two auxiliary magnetic steels of each group of auxiliary magnetic steel units are perpendicular to the vibration direction, and the magnetic poles of one side, close to the magnetic steels, of the auxiliary magnetic steels are opposite to the magnetic poles of one end, far away from the soft magnetic block, of the magnetic steels.

Preferably, the linear vibration motor further includes two shell plates fixed to the guide housing, the two shell plates are respectively located at opposite ends of the guide housing in an axial direction of the guide passage, and the shell plates at least partially cover the guide passage.

Compared with the prior art, the utility model discloses a linear vibration motor is increasing increase electrically conductive damping unit again on the basis of supplementary magnet steel unit, electrically conductive damping unit follows the vibration direction of vibration unit is fixed in respectively the both ends of coil unit. When the vibration unit vibrates, the magnet steel moves along with the vibration of the vibration unit, and simultaneously the magnetic field that the magnet steel formed also moves along with, the magnetic field intensity at different positions of the conductive damping unit consequently also changes, and at the moment, the conductive damping unit generates local eddy current, thereby generating the back electromotive force that hinders the vibration of the vibration unit, namely generating the damping force that hinders the motion of the vibration unit. The damping force is along with the vibration of vibration unit changes, consequently the utility model discloses can provide better vibration performance, the reliability is better.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work, wherein:

fig. 1 is an exploded view of a part of a three-dimensional structure of a first embodiment of the sound generating device of the present invention;

fig. 2 is a schematic perspective view of a first embodiment of the sound device according to the present invention;

FIG. 3 is a sectional view taken along line A-A of FIG. 2;

fig. 4 is an exploded view of a partial three-dimensional structure of a second embodiment of the sound device of the present invention;

FIG. 5 is a schematic view of a three-dimensional structure of a second embodiment of the sound device of the present invention

Fig. 6 is an exploded view of a part of a three-dimensional structure of a third embodiment of the sound device of the present invention;

FIG. 7 is a schematic view of a three-dimensional structure of a third embodiment of the sound device of the present invention

Detailed Description

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 efforts belong to the protection scope of the present invention.

Example one

Referring to fig. 1-3, the present invention provides a linear vibration motor 100, which includes a guide housing 1, a vibration unit 2, a coil unit 3, an auxiliary magnetic steel unit 4, an outer shell 5, and a conductive damping unit 6.

The guide housing 1 includes a body 11, a guide passage 12 penetrating the body 11, a first receiving groove 13 formed by recessing an outer surface of the guide housing 1, and a second receiving groove 14 having a ring shape.

The guide passage 12 is used to accommodate the vibration unit 2 and provide a vibration space for the vibration unit 2.

In the present embodiment, the first receiving grooves 13 include two sets and are disposed at opposite sides of the second receiving groove 14 at intervals along the vibration direction of the vibration unit 2.

The vibration unit 2 is accommodated in the guide passage 12 and is slidably coupled to form a sliding type vibration mode.

The vibration unit 2 includes a magnetic steel unit 21 and a mass block 22.

The magnetic steel unit 21 is used for interacting with the coil unit 3 to provide driving force.

In this embodiment, the magnetic steel unit 21 includes a magnetic steel 211 and a soft magnetic block 212 attached to a magnetic pole of the magnetic steel 211. Specifically, the magnetic steels 211 include two; the soft magnetic block 212 is clamped and fixed between the two magnetic steels 211 and is used for magnetic conduction. Of course, the number of the magnetic steel 211 and the soft magnetic blocks 212 is not limited to the above example.

The mass 22 is used as a counterweight to increase the weight of the vibration unit 2, so as to improve the vibration amplitude of the vibration unit 2 and improve the vibration performance.

In this embodiment, the mass block 22 includes two and is attached to one side of the magnetic steel 211 away from the soft magnetic block 212 along the vibration direction.

The coil unit 3 is sleeved on the outer side of the guide shell 1 and used for driving the vibration unit 2 to vibrate along the axial direction of the guide channel 1.

In the present embodiment, the coil unit 3 is accommodated and fixed in the second accommodation groove 14. On the one hand, the fixing effect can be enhanced, and on the other hand, the entire volume of the linear vibration motor 100 can be reduced.

The auxiliary magnetic steel unit 4 is fixed on the guide shell 1 and arranged at intervals with the vibration unit 2. The auxiliary magnetic steel unit 4 is located in the magnetic field of the magnetic steel unit 21 to generate a vibration restoring force for restoring the vibration displacement of the vibration unit 2, that is, to provide a restoring force for the reciprocating vibration of the vibration unit 2 in the horizontal vibration direction.

In this embodiment, the auxiliary magnetic steel unit 4 includes two sets, and the vibration directions of the vibration unit 2 are respectively located at two opposite ends of the coil unit 3.

Specifically, each set of the auxiliary magnetic steel unit 4 includes two auxiliary magnetic steels 41, and the two auxiliary magnetic steels 41 are respectively disposed on two opposite sides of the guide housing 1 along a direction perpendicular to the vibration direction. Of course, the structure and number of each set of auxiliary magnetic steel units 4 are not limited to the above examples.

In this embodiment, the two sets of auxiliary magnetic steel units 4 are respectively accommodated and fixed in the two sets of first accommodating grooves 13. On the one hand, the fixing effect can be enhanced, and on the other hand, the entire volume of the linear vibration motor 100 can be reduced.

As shown in fig. 3, in the present embodiment, the magnetizing directions of the two magnetic steels 211 of the magnetic steel unit 21 are both parallel to the vibration direction, and the magnetizing directions are opposite; the magnetizing directions of the two auxiliary magnetic steels 41 in each group of auxiliary magnetic steel units 4 are perpendicular to the vibration direction, and the magnetic pole of one side of the auxiliary magnetic steel 41 close to the magnetic steel 211 is opposite to the magnetic pole of one end of the magnetic steel 211 far away from the soft magnetic block 212.

The coil unit 3 interacts with the magnetic steel unit 21 to provide a reciprocating driving force for the vibration unit 2, and the auxiliary magnetic steel unit 4 provides a reciprocating restoring force during the reciprocating vibration of the vibration unit 2.

The shell plate 5 includes two and is fixed in respectively the body 11 of direction casing 1, two the shell plate 5 is followed the axial of direction passageway 12 is located respectively the relative both ends of direction casing 1, be fixed in the relative both ends of body 11 promptly, just the shell plate 5 at least part covers direction passageway 12. In the present embodiment, both housing plates 5 completely cover the guide passage 12.

Electrically conductive damping unit 6 is located in order to produce the hindrance in the magnetic field of magnet steel unit 21 the damping force of the 2 motion of vibration unit, electrically conductive damping unit 6 includes two sets ofly, and is two sets of damping unit 6 is fixed in respectively direction casing 1, and follows vibration unit 2's vibration direction is located respectively coil unit 3's relative both ends. The conductive damping unit 6 is made of a material with high conductivity, such as copper. Specifically, in this embodiment, each group of the conductive damping units 6 includes two conductive damping units 61 disposed oppositely, and the two conductive damping units 61 of each group are respectively fixed to two opposite sides of the guide housing 1 along a direction perpendicular to the vibration direction; specifically, the same group of two conductive damping units 6 are respectively located on two opposite sides of the guide housing 1, and the same group of two auxiliary magnetic steel units 4 are respectively fixed on the other opposite sides of the guide housing 1 through the auxiliary magnetic steel 41.

Magnet steel unit 21 is in reciprocating motion under the drive of drive power, and then drives the magnetic field that magnet steel unit 21 formed removes, this moment electrically conductive damping unit 6 for magnet steel unit 21 is in quiescent condition, the magnetic field intensity of electrically conductive damping unit 6 changes because of the removal in magnetic field, different vibration moments promptly, the magnetic field intensity at the different positions of electrically conductive damping unit 6 is also different, produces local vortex to the production hinders the back electromotive force of 2 vibrations of vibration unit produces the electromagnetic damping effect. The larger the magnetic field change is, the higher the frequency of vibration of the vibration unit 2 is, and the larger the stroke is, the better the electromagnetic damping effect can be.

Coil unit 3 and magnet steel unit 21 interact is used for providing reciprocating motion's drive power for vibration unit 2, and supplementary magnet steel unit 4 provides the reciprocating restoring force of vibration in vibration reciprocating motion process of vibration unit 2, electrically conductive damping unit 6 is located in magnet steel unit 21's the magnetic field is in order to produce the damping force that hinders vibration unit 2 motion. By utilizing the resonance principle, under the driving of the driving force, the maximum vibration displacement is generated near the resonance frequency of the auxiliary magnetic steel unit 4 and the conductive damping unit 6, so that the maximum vibration sense is obtained. The linear vibration motor 100 adjusts the vibration of the vibration unit 2 depending on the voltage to obtain different vibration strengths, and is simple and convenient to operate. At a certain high voltage, the vibration unit 2 may be collided with the housing plate 5 to obtain a collision effect, resulting in more user experience.

Example two

Referring to fig. 4-5, the present invention provides a linear vibration motor 100 ', which includes a guide housing 1', a vibration unit 2 ', a coil unit 3', an auxiliary magnetic steel unit 4 ', and a conductive damping unit 5'.

The guide housing 1 ' includes a body 11 ', a guide passage 12 ' penetrating the body 11 ', a first receiving groove 13 ' and a second receiving groove 14 ' having a ring shape formed by recessing an outer surface of the guide housing 1 '.

The guide channel 12 ' is used to accommodate the vibration unit 2 ' and provide a vibration space for the vibration unit 2 '.

In this embodiment, the first receiving grooves 13 ' include two sets and are disposed at opposite sides of the second receiving groove 14 ' at intervals along the vibration direction of the vibration unit 2 '.

The vibration unit 2 'is accommodated in the guide channel 12' and is connected in a sliding manner, so that a sliding type vibration mode is formed.

The vibration unit 2 ' includes a magnetic steel unit 21 ' and a mass 22 '.

The magnetic steel unit 21 'is used for interacting with the coil unit 3' to provide driving force.

In this embodiment, the magnetic steel unit 21 'includes a magnetic steel 211' and a soft magnetic block 212 'attached to a magnetic pole of the magnetic steel 211'. Specifically, the magnetic steel 211' includes two pieces; the soft magnetic block 212 'is clamped and fixed between the two magnetic steels 211' and is used for magnetic conduction. Of course, the number of the magnetic steel 211 'and the soft magnetic blocks 212' is not limited to the above example.

The mass block 22 ' is used as a counterweight to increase the weight of the vibration unit 2 ' so as to improve the vibration amplitude of the vibration unit 2 ' and improve the vibration performance.

In this embodiment, the mass block 22 ' includes two and is attached to one side of the magnetic steel 211 ' far away from the soft magnetic block 212 ' along the vibration direction.

The coil unit 3 'is sleeved outside the guide housing 1' and used for driving the vibration unit 2 'to vibrate along the axial direction of the guide channel 1'.

In the present embodiment, the coil unit 3 'is accommodated and fixed in the second accommodation groove 14'. On the one hand, the fixing effect can be enhanced, and on the other hand, the entire volume of the linear vibration motor 100' can be reduced.

The auxiliary magnetic steel unit 4 ' is fixed on the guide shell 1 ' and is arranged at an interval with the vibration unit 2 '. The auxiliary magnetic steel unit 4 'is located in the magnetic field of the magnetic steel unit 21' to generate a vibration restoring force for restoring the vibration displacement of the vibration unit 2 ', that is, to provide a restoring force for the reciprocating vibration of the vibration unit 2' in the horizontal vibration direction.

In this embodiment, the auxiliary magnetic steel units 4 ' include two sets, and are respectively disposed at two opposite ends of the coil unit 3 ' along the vibration direction of the vibration unit 2 '.

Specifically, each set of the auxiliary magnetic steel unit 4 'includes two auxiliary magnetic steels 41', and the two auxiliary magnetic steels 41 'are respectively fixed to two opposite sides of the guide housing 1' along a direction perpendicular to the vibration direction. Of course, the structure and number of each group of auxiliary magnetic steel units 4' are not limited to the above examples.

In this embodiment, the two sets of auxiliary magnetic steel units 4 'are respectively accommodated and fixed in the two sets of first accommodating grooves 13'. On the one hand, the fixing effect can be enhanced, and on the other hand, the entire volume of the linear vibration motor 100' can be reduced.

In this embodiment, the magnetizing directions of the magnetic steel unit 21 'and the auxiliary magnetic steel unit 4' are the same as those of the magnetic steel unit 21 and the auxiliary magnetic steel unit 4 in the first embodiment, please refer to the first embodiment, the magnetizing directions of the two magnetic steels 211 'of the magnetic steel unit 21' are both parallel to the vibration direction, and the magnetizing directions are opposite; the magnetizing directions of the two auxiliary magnetic steels 41 'in each group of auxiliary magnetic steel units 4' are perpendicular to the vibration direction, and the magnetic pole of one side of the auxiliary magnetic steel 41 'close to the magnetic steel 211' is opposite to the magnetic pole of one end of the magnetic steel 211 'far away from the soft magnetic block 212'.

The coil unit 3 ' interacts with the magnetic steel unit 21 ' to provide a reciprocating driving force for the vibration unit 2 ', and the auxiliary magnetic steel unit 4 ' provides a reciprocating restoring force during the reciprocating vibration of the vibration unit 2 '.

The conductive damping unit 5 ' is located in the magnetic field of the magnetic steel unit 21 ' to generate damping force for blocking the movement of the vibration unit 2 ', and the conductive damping unit 5 ' comprises two groups and is fixed on the guide shell 1 ' respectively and is fixed on the two opposite ends of the coil unit 3 ' respectively along the vibration direction of the vibration unit 2 '. The conductive damping unit 5' is made of a material with high conductivity, such as copper. Specifically, in this embodiment, two sets of the conductive damping units 6 'are respectively attached and fixed to two opposite sides of the guide housing 1' along the vibration direction of the vibration unit 2 'and at least partially cover the guide channel 12'; in this embodiment, the conductive damping unit 6 'completely covers the guide channel 12'.

Magnet steel unit 21 ' is in reciprocating motion under the drive of drive power, and then drives the magnetic field that magnet steel unit 21 ' formed removes, this moment electrically conductive damping unit 5 ' for magnet steel unit 21 ' is in quiescent condition, the magnetic field intensity of electrically conductive damping unit 5 ' changes because of the removal in magnetic field, different vibration moments promptly, the magnetic field intensity of electrically conductive damping unit 5 ' different positions is also different, produces local vortex to the production hinders the back electromotive force of vibration unit 2 ' vibration produces the electromagnetic damping effect. The larger the magnetic field change is, the higher the frequency of vibration of the vibration unit 2' is, and the larger the stroke is, the better the electromagnetic damping effect can be.

The coil unit 3 'interacts with the magnetic steel unit 21' to provide a reciprocating driving force for the vibration unit 2 ', the auxiliary magnetic steel unit 4' provides a reciprocating restoring force during the reciprocating vibration of the vibration unit 2 ', and the conductive damping unit 5' is located in the magnetic field of the magnetic steel unit 21 'to generate a damping force for blocking the movement of the vibration unit 2'. By utilizing the resonance principle, under the driving of the driving force, the maximum vibration displacement is generated near the resonance frequency of the auxiliary magnetic steel unit 4 'and the conductive damping unit 5', so that the maximum vibration sense is obtained. The linear vibration motor 100 'adjusts the vibration of the vibration unit 2' depending on the voltage to obtain different vibration strengths, and is simple and convenient to operate. Under certain high voltage, the vibration unit 2 'and the conductive damping unit 5' can collide to obtain a collision effect, which brings more user experience.

EXAMPLE III

Referring to fig. 6-7, the present invention provides a linear vibration motor 100 "including a guide housing 1", a vibration unit 2 ", a coil unit 3", an auxiliary magnetic steel unit 4 ", an outer shell 5" and a conductive damping unit 6 ".

The guide housing 1 "includes a body 11", a guide passage 12 penetrating the body 11 ", and an annular receiving groove 13 recessed from an outer surface of the guide housing 1".

The guide channel 12 "is used to accommodate the vibration unit 2" and provides a vibration space for the vibration unit 2 ".

The vibration unit 2 "is accommodated in the guide channel 12" and is connected in a sliding manner, so that a sliding type vibration mode is formed.

The vibration unit 2 "comprises a magnetic steel unit 21" and a mass 22 ".

In this embodiment, magnetic steel unit 21 ″ includes magnetic steel 211 ″ and soft magnetic block 212 ″ attached to the magnetic pole of magnetic steel 211 ″. Specifically, the magnetic steel 211 ″ includes two; the soft magnetic block 212 is clamped and fixed between the two magnetic steels 211 and is used for magnetic conduction. Of course, the number of the magnetic steel 211 "and the soft magnetic blocks 212" is not limited to the above example.

The mass block 22 "is used as a counterweight to increase the weight of the vibration unit 2" so as to improve the vibration amplitude of the vibration unit 2 "and improve the vibration performance.

In this embodiment, the mass block 22 ″ includes two and is attached to one side of the magnetic steel 211 ″ away from the soft magnetic block 212 ″ along the vibration direction.

The coil unit 3 'is sleeved on the outer side of the guide shell 1' and used for driving the vibration unit 2 'to vibrate along the axial direction of the guide channel 1'.

In the present embodiment, the coil unit 3 ″ is accommodated and fixed in the accommodation groove 13 ″. On the one hand, the fixing effect can be enhanced, and on the other hand, the overall volume of the linear vibration motor 100 "can be reduced.

The auxiliary magnetic steel unit 4 ' is fixed on the guide shell 1 ' and is arranged at intervals with the vibration unit 2 '. The auxiliary magnetic steel unit 4 "is located in the magnetic field of the magnetic steel unit 21" to generate a vibration restoring force for restoring the vibration displacement of the vibration unit 2 ", that is, to provide a restoring force for the reciprocating vibration of the vibration unit 2" in the horizontal vibration direction.

In this embodiment, the auxiliary magnetic steel unit 4 ″ includes two sets, and is located respectively in the vibration direction of the vibration unit 2 ″ at the opposite ends of the coil unit 3 ″.

Specifically, each group of the auxiliary magnetic steel units 4 "includes two auxiliary magnetic steels 41", and the two auxiliary magnetic steels 41 "are respectively fixed to two opposite sides of the guide housing 1" along a direction perpendicular to the vibration direction. Of course, the structure and number of each group of auxiliary magnetic steel units 4 "are not limited to the above examples.

In this embodiment, the magnetizing directions of the magnetic steel unit 21 "and the auxiliary magnetic steel unit 4" are the same as those of the magnetic steel unit 21 and the auxiliary magnetic steel unit 4 in the first embodiment, please refer to the first embodiment, the magnetizing directions of the two magnetic steels 211 "of the magnetic steel unit 21" are both parallel to the vibration direction, and the magnetizing directions are opposite; the magnetizing directions of the two auxiliary magnetic steels 41 "in each group of auxiliary magnetic steel units 4" are perpendicular to the vibration direction, and the magnetic poles of one side of the auxiliary magnetic steel 41 "close to the magnetic steel 211" are opposite to the magnetic poles of one end of the magnetic steel 211 "far away from the soft magnetic block 212".

The coil unit 3 and the magnetic steel unit 21 interact to provide a reciprocating driving force for the vibration unit 2, and the auxiliary magnetic steel unit 4 provides a reciprocating restoring force in the vibration reciprocating process of the vibration unit 2.

The outer shell plates 5 "comprise two bodies 11" fixed to the guide housing 1 ", the two outer shell plates 5" are respectively located at two opposite ends of the guide housing 1 ", namely, at two opposite ends of the body 11", along the axial direction of the guide channel 12 ", and the outer shell plates 5" at least partially cover the guide channel 12 ". In the present embodiment, both housing plates 5 "completely cover the guide channel 12".

The conductive damping unit 6 ' is positioned in the magnetic field of the magnetic steel unit 21 ' to generate damping force for blocking the movement of the vibration unit 2 '. The conductive damping units 6 "comprise two groups and are respectively fixed at two opposite ends of the coil unit 3" along the vibration direction of the vibration unit 2 ". The conductive damping unit 6 "is made of a material with a high conductivity, such as copper. Specifically, in this embodiment, each group of the conductive damping units 6 "includes two conductive damping units 61" disposed oppositely, and the two conductive damping units 61 "are respectively fixed to two opposite sides of the guide housing 1" along a direction perpendicular to the vibration direction; the two auxiliary magnetic steels 41 "of the same group of auxiliary magnetic steel units 4" are respectively embedded in the two conductive damping monomers 61 "of the same group of conductive damping units 6".

Magnet steel unit 21 "is in reciprocating motion under the drive of drive power, and then drives the magnetic field that magnet steel unit 21" formed removes, this moment electrically conductive damping unit 6 "for magnet steel unit 21" is in quiescent condition, the magnetic field intensity of electrically conductive damping unit 6 "changes because of the removal in magnetic field, different vibration moments promptly, the magnetic field intensity of electrically conductive damping unit 6" different positions is also different, produces local vortex to the production hinders the back electromotive force of vibration unit 2 "vibration produces the electromagnetic damping effect. The larger the magnetic field change is, the higher the frequency of vibration of the vibration unit 2' is, and the larger the stroke is, the better the electromagnetic damping effect can be achieved.

The coil unit 3 and the magnetic steel unit 21 interact to provide a reciprocating driving force for the vibration unit 2, the auxiliary magnetic steel unit 4 provides a reciprocating restoring force in the vibration reciprocating process of the vibration unit 2, and the conductive damping unit 6 is located in a magnetic field of the magnetic steel unit 4 to generate a damping force for blocking the vibration unit 2. By utilizing the resonance principle, under the driving of the driving force, the maximum vibration displacement is generated near the resonance frequency of the auxiliary magnetic steel unit 4 'and the conductive damping unit 6', so that the maximum vibration sense is obtained. The linear vibration motor 100 'adjusts the vibration of the vibration unit 2' depending on the voltage to obtain different vibration strengths, and is simple and convenient to operate. At a certain high voltage, the vibration unit 2 "may be collided with the housing plate 5" to obtain a collision effect, resulting in more user experience.

Of course, the arrangement mode of the conductive damper is not limited to the above three embodiments, and the conductive damper arrangement in the above three embodiments may also be combined.

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, characterized by comprising:

2. The linear vibration motor of claim 1, wherein the auxiliary magnetic steel units comprise two sets and are respectively disposed at two opposite ends of the coil unit along the vibration direction of the vibration unit, each set of the auxiliary magnetic steel units comprises two auxiliary magnetic steels and is respectively fixed at two opposite sides of the guide housing along the direction perpendicular to the vibration direction.

3. The linear vibration motor of claim 2, wherein each set of the conductive damping units comprises two conductive damping units disposed oppositely; the two conductive damping monomers are respectively fixed on two opposite sides of the guide shell along the direction perpendicular to the vibration direction.

4. The linear vibration motor of claim 3, wherein two auxiliary magnetic steels of the same set of auxiliary magnetic steel units are respectively embedded in two conductive damping units of the same set of conductive damping units.

5. The linear vibration motor of claim 3, wherein two conductive damping units of the same set of conductive damping units are respectively located at two opposite sides of the guide housing, and two auxiliary magnetic steels of the same set of auxiliary magnetic steel units are respectively fixed at the other opposite sides of the guide housing.

6. The linear vibration motor according to any one of claims 1 to 2, wherein two sets of the conductive damping units are respectively attached and fixed to opposite sides of the guide housing along a vibration direction of the vibration unit and at least partially cover the guide passage.

7. The linear vibration motor of claim 2, wherein the magnetic steel unit includes a magnetic steel and a soft magnet attached to a magnetic pole of the magnetic steel.

8. The linear vibration motor of claim 7, wherein the magnetic steels include two, and the soft magnetic block is sandwiched and fixed between the two magnetic steels.

9. The linear vibration motor of claim 8, wherein the vibration unit further comprises a mass block, and the mass block is attached to one side of the magnetic steel, which is far away from the soft magnetic block, along the vibration direction.

10. The linear vibration motor of claim 9, wherein the magnetizing directions of the two magnetic steels are parallel to the vibration direction and opposite to each other; the magnetizing directions of the two auxiliary magnetic steels of each group of auxiliary magnetic steel units are perpendicular to the vibration direction, and the magnetic poles of one side, close to the magnetic steels, of the auxiliary magnetic steels are opposite to the magnetic poles of one end, far away from the soft magnetic block, of the magnetic steels.

11. The linear vibration motor according to claim 3, further comprising two shell plates fixed to the guide housing, the two shell plates being respectively located at opposite ends of the guide housing in an axial direction of the guide passage, and the shell plates at least partially covering the guide passage.