WO2021127913A1

WO2021127913A1 - Linear vibration motor

Info

Publication number: WO2021127913A1
Application number: PCT/CN2019/127608
Authority: WO
Inventors: 浦晓峰; 凌芳华; 石梦珣; 安爱玲
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声科技(新加坡)有限公司
Priority date: 2019-12-23
Filing date: 2019-12-23
Publication date: 2021-07-01

Abstract

A linear vibration motor (100), comprising a guide housing (1), a vibrating unit (2), a coil unit (3) and an auxiliary magnetic steel unit (4). The guide housing (1) is made of a conductive material, and the guide housing (1) comprises a body (11) and a guide channel (12) penetrating through the body (11); the vibrating unit (2) is accommodated in the guide channel (12) and forms a sliding connection with the latter, and the vibrating unit (2) comprises a magnetic steel unit (21); the coil unit (3) is sleeved on the outer side the guiding shell (1) and is used for driving the vibrating unit (2) to vibrate along the axial direction of the guide channel (12); the auxiliary magnetic steel unit (4) is fixed to the guide housing (1) and is spaced apart from the vibrating unit (2), and the auxiliary magnetic steel unit (4) is located within the magnetic field of the magnetic steel unit (21) to generate a vibration restoring force for restoring the vibration displacement of the vibrating unit (2). Compared with the related art, the linear vibration motor (100) is simple to assemble and stable in performance.

Description

Linear vibration motor

Technical field

The utility model relates to a motor, in particular to a linear vibration motor used in the field of mobile electronic products.

Background technique

With the development of electronic technology, portable consumer electronic products are becoming more and more popular, such as mobile phones, handheld game consoles, navigation devices or handheld multimedia entertainment equipment, etc. These electronic products generally use linear vibration motors for system feedback , Such as mobile phone call reminder, information reminder, navigation reminder, vibration feedback of game console, etc. Such a wide range of applications requires the vibration motor to have excellent performance and long service life.

The related art linear vibration motor includes a base having a housing space, a vibration unit, an elastic component or bearing fixed to the base and suspending the vibration unit in the housing space, and fixed to the base to The coil unit that drives the vibration unit to vibrate interacts with the magnetic field generated by the vibration unit through the electric field generated by the coil unit, thereby driving the vibration unit to make a reciprocating linear motion to generate vibration.

technical problem

However, the material of the guide housing in the linear vibration motor of the related art is magnetic fluid or foamed material, which causes the electromagnetic damping generated by the guide housing to be greatly affected by the environment, resulting in poor stability of the linear vibration motor.

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

Technical solutions

The technical problem to be solved by the utility model is to provide a linear vibration motor with simple assembly, good vibration performance and high reliability.

In order to solve the above technical problems, the present invention provides a linear vibration motor, which includes a guide housing, a vibration unit, a coil unit and an auxiliary magnetic steel unit; the guide housing is made of conductive material, and the guide housing It includes a main body and a guide channel penetrating the main body; the vibration unit is accommodated in the guide channel and forms a sliding connection, the vibration unit includes a magnetic steel unit, and the coil unit is sleeved on the outside of the guide housing, Is used to drive the vibration unit to vibrate along the axial direction of the guide channel; the auxiliary magnetic steel unit is fixed to the guide housing and is spaced apart from the vibration unit, and the auxiliary magnetic steel unit is located in the magnetic steel A vibration restoring force for restoring the vibration displacement of the vibration unit is generated in the magnetic field of the unit.

Preferably, the auxiliary magnetic steel unit includes two groups, which are respectively arranged on opposite sides of the voice coil unit along the vibration direction of the vibration unit.

Preferably, each group of the auxiliary magnetic steel unit includes two auxiliary magnetic steels, which are respectively arranged on opposite sides of the vibration unit along a direction perpendicular to the vibration direction.

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

Preferably, the magnetic steel includes two, and the soft magnetic block is sandwiched and fixed between the two magnetic steels.

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

Preferably, the magnetization directions of the two magnets are parallel to the vibration direction, and the magnetization directions are opposite; the magnetization directions of the two auxiliary magnets of the auxiliary magnet unit are perpendicular to the vibration direction , And the magnetizing direction is opposite.

Preferably, the linear vibration motor further includes two housing plates fixed to the guide housing, the two housing plates are respectively located at opposite ends of the guide housing along the axial direction of the guide channel, and The housing plate at least partially covers the guide channel.

Preferably, the outer surface of the guide housing is recessed to form two sets of first receiving grooves and a ring-shaped second receiving groove, and the two sets of first receiving grooves are arranged in the second receiving groove at intervals along the vibration direction. On opposite sides of the slot, the two sets of auxiliary magnetic steel units are respectively accommodated and fixed in the two sets of the first accommodating grooves, and the coil unit is accommodated and fixed in the second accommodating grooves.

Beneficial effect

Compared with the related art, in the linear vibration motor of the present invention, the guide housing not only functions as a guide rail, but also generates electromagnetic damping due to changes in the magnetic field. The electromagnetic damping generated by the guide housing can better adjust the vibration. The damping of the unit, so as to obtain better performance parameters, the two functions are integrated, which can simplify the assembly. In addition, the material of the guide housing is conductive material, so that the electromagnetic damping generated by the guide housing is less affected by the environment, so that the performance of the linear vibration motor is more stable.

Description of the drawings

In order to more clearly explain the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings needed in the description of the embodiments. Obviously, the drawings in the following description are only some implementations of the present utility model. For example, for those of ordinary skill in the art, without creative work, other drawings can be obtained based on these drawings, among which:

Figure 1 is a schematic diagram of the three-dimensional structure of the sound generating device of the present invention;

Figure 2 is an exploded view of a part of the three-dimensional structure of the sound device of the present invention;

Fig. 3 is a cross-sectional view taken along the line A-A in Fig. 1.

Embodiments of the present invention

The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, not all of them. Examples. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the scope of protection of the present utility model.

Please refer to FIGS. 1-3 at the same time. The present invention provides a linear vibration motor 100, a guide housing 1, a vibration unit 2, a coil unit 3, an auxiliary magnetic steel unit 4, and a housing plate 5.

The guide housing 1 includes a main body 11, a guide channel 12 penetrating the main body 11, a first receiving groove 13 and a ring-shaped second receiving groove 14 recessed by the 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 groove 13 includes two groups, and they are arranged on opposite sides of the second receiving groove 14 at intervals along the vibration direction of the vibration unit 2.

The material of the guide housing 1 is a conductive material. In this embodiment, the material of the guide housing 1 is copper. Of course, the material of the guide housing 1 is not limited to this, and can also be other conductivity materials. High material.

In this embodiment, the guide housing 1 not only functions as a guide rail, but also generates electromagnetic damping due to changes in the magnetic field. The electromagnetic damping generated by the guide housing 1 can better adjust the damping of the vibration unit 2. In order to obtain better performance parameters, the two functions are integrated, which can simplify assembly. In addition, the material of the guide housing 1 is copper, so that the electromagnetic damping generated by the guide housing 1 is less affected by the environment, so that the performance of the linear vibration motor is more stable.

The vibration unit 2 is accommodated in the guide channel 12 and forms a sliding connection, thereby forming a sliding vibration mode.

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

The magnetic steel unit 21 is used to interact 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 the magnetic pole of the magnetic steel 211. Specifically, the magnetic steel 211 includes two; the soft magnetic block 212 is sandwiched and fixed between the two magnetic steels 211 for magnetic conduction. Of course, the number of the magnetic steel 211 and the soft magnetic block 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 to achieve the purpose of increasing the vibration amplitude of the vibration unit 2 and improving the vibration performance.

In this embodiment, the mass block 22 includes two masses and is attached to a 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 outside of the guide housing 1 to drive the vibration unit 2 to vibrate along the axial direction of the guide channel 1.

In this embodiment, the coil unit 3 is accommodated and fixed in the second accommodating groove 14. 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 to the guide housing 1 and is spaced apart from the vibration unit 2. The auxiliary magnetic steel unit 4 acts as a magnetic spring structure, which 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, the vibration unit is in a horizontal position. The reciprocating vibration in the vibration direction provides restoring force.

In this embodiment, the auxiliary magnetic steel unit 4 includes two groups, and they are respectively arranged on opposite sides of the voice coil unit 3 along the vibration direction of the vibration unit 2.

Specifically, each group of the auxiliary magnetic steel unit 4 includes two auxiliary magnetic steels 41, and the two auxiliary magnetic steels 41 are respectively arranged on opposite sides of the vibration unit 2 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 accommodated and fixed in the two sets of first accommodating slots 13 respectively. 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.

As shown in FIG. 3, in this embodiment, the magnetization directions of the two magnets 211 of the magnet unit 21 are both parallel to the vibration direction, and the magnetization directions are opposite; the magnetization directions of the two sets of auxiliary magnet units 4 Similarly, the magnetization directions of the two auxiliary magnets 41 in each group of auxiliary magnet units 4 are perpendicular to the vibration direction, and the magnetization directions are opposite.

The coil unit 3 interacts with the magnet unit 21 to provide a reciprocating driving force for the vibrating unit 2, and the auxiliary magnet unit 4 provides a restoring force similar to a traditional spring in the vibration reciprocating motion of the vibrating unit 2; linear vibration The unit 100 uses the principle of resonance. Driven by the coil unit 3 as the drive system, the maximum vibration displacement is generated near the resonance frequency of the auxiliary magnetic steel unit 4, thereby obtaining the maximum shock sense. The vibration displacement is 3-4 of the related-art linear vibration motor. Times, large displacement can excavate more vibration modes and bring more vibration experience.

Since a sliding magnetic spring vibration structure is formed between the vibrating unit 2, the guide channel 12 and the auxiliary magnetic steel unit 4, the problem of fatigue and failure of the spring structure itself and the problem of falling off when the traditional spring structure is used to provide support and restoring force is avoided, and the problem is effective The service life of the linear vibration motor 100 is improved, and the reliability is good.

In addition, due to the formation of the sliding magnetic spring vibration structure, the traditional spring is omitted, the assembly process is simpler, and the accuracy of the sauce is lower, which effectively improves the assembly efficiency and the yield of the finished product.

The housing plate 5 includes two bodies 11 respectively fixed to the guide housing 1, and the two housing plates 5 are respectively located at opposite ends of the guide housing 1 along the axial direction of the guide channel 12, namely It is fixed to opposite ends of the main body 11, and the shell plate 5 at least partially covers the guide channel 12. In this embodiment, both of the two shell plates 5 completely cover the guide channel 12.

When the linear vibration motor is used, the vibration displacement of the vibration unit 2 can be adjusted according to different voltages, so as to obtain different vibration intensities, and is different from traditional motors. The linear vibration motor 100 of the present invention forms a sliding magnetic spring vibration structure, which is high at a certain height. Under voltage, the vibration unit 2 can collide with the housing plate 5 to obtain a collision effect and bring more user experience.

The above are only the embodiments of the utility model, and do not limit the patent scope of the utility model. Any equivalent structure or equivalent process transformation made by using the description and drawings of the utility model, or directly or indirectly applied to other Related technical fields are included in the scope of patent protection of the utility model in the same way.

Claims

A linear vibration motor, characterized in that it comprises a guide housing, a vibration unit, a coil unit, and an auxiliary magnetic steel unit; the material of the guide housing is a conductive material, and the guide housing includes a main body and a penetrating through the main body The guide channel; the vibration unit is accommodated in the guide channel and forms a sliding connection, the vibration unit includes a magnetic steel unit, the coil unit is sleeved outside the guide housing to drive the vibration unit Vibrates along the axial direction of the guide channel; the auxiliary magnetic steel unit is fixed to the guide housing and is spaced apart from the vibration unit, and the auxiliary magnetic steel unit is located in the magnetic field of the magnetic steel unit to generate The vibration restoring force for restoring the vibration displacement of the vibration unit.
The linear vibration motor according to claim 1, wherein the auxiliary magnetic steel unit includes two groups, and they are respectively provided on opposite sides of the coil unit along the vibration direction of the vibration unit.
The linear vibration motor according to claim 2, wherein each group of the auxiliary magnetic steel unit includes two auxiliary magnetic steels, which are respectively arranged on opposite sides of the vibration unit along a direction perpendicular to the vibration direction .
The linear vibration motor according to claim 3, wherein the magnetic steel unit comprises a magnetic steel and a soft magnetic block attached to the magnetic pole of the magnetic steel.
The linear vibration motor according to claim 4, wherein the magnetic steel comprises two, and the soft magnetic block is sandwiched and fixed between the two magnetic steels.
The linear vibration motor according to claim 4, wherein the vibration unit further comprises a mass block, and the mass block is attached to a side of the magnetic steel away from the soft magnetic block along the vibration direction.
The linear vibration motor according to claim 5, wherein the magnetization directions of the two magnets are parallel to the vibration direction, and the magnetization directions are opposite; the two auxiliary magnets of the auxiliary magnet unit The magnetizing direction of the magnet is perpendicular to the vibration direction, and the magnetizing direction is opposite.
The linear vibration motor of claim 1, wherein the linear vibration motor further comprises two housing plates fixed to the guide housing, and the two housing plates are respectively along the axial direction of the guide channel. Located at opposite ends of the guide shell, and the shell plate at least partially covers the guide channel.
The linear vibration motor of claim 2, wherein the outer surface of the guide housing is recessed to form two sets of first receiving grooves and a ring-shaped second receiving groove. The vibration direction is arranged at intervals on opposite sides of the second accommodating groove, the two sets of auxiliary magnetic steel units are respectively accommodated and fixed in the two sets of the first accommodating groove, and the coil unit is accommodated and fixed in the 2. In the containment slot.