WO2020140534A1 - 线性振动电机 - Google Patents

线性振动电机 Download PDF

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Publication number
WO2020140534A1
WO2020140534A1 PCT/CN2019/110641 CN2019110641W WO2020140534A1 WO 2020140534 A1 WO2020140534 A1 WO 2020140534A1 CN 2019110641 W CN2019110641 W CN 2019110641W WO 2020140534 A1 WO2020140534 A1 WO 2020140534A1
Authority
WO
WIPO (PCT)
Prior art keywords
positioning arm
positioning
vibration motor
arm
linear vibration
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2019/110641
Other languages
English (en)
French (fr)
Inventor
陶锋
凌芳华
许洪富
浦晓峰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AAC Technologies Holdings Shenzhen Co Ltd
AAC Technologies Pte Ltd
Original Assignee
AAC Acoustic Technologies Shenzhen Co Ltd
AAC Technologies Pte Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by AAC Acoustic Technologies Shenzhen Co Ltd, AAC Technologies Pte Ltd filed Critical AAC Acoustic Technologies Shenzhen Co Ltd
Publication of WO2020140534A1 publication Critical patent/WO2020140534A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
    • H02K33/18—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with coil systems moving upon intermittent or reversed energisation thereof by interaction with a fixed field system, e.g. permanent magnets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/04—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with electromagnetism
    • B06B1/045—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with electromagnetism using vibrating magnet, armature or coil system
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/34—Reciprocating, oscillating or vibrating parts of the magnetic circuit
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
    • H02K33/02—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
    • H02K33/02—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs
    • H02K33/04—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs wherein the frequency of operation is determined by the frequency of uninterrupted AC energisation
    • H02K33/06—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs wherein the frequency of operation is determined by the frequency of uninterrupted AC energisation with polarised armatures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
    • H02K33/16—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with polarised armatures moving in alternate directions by reversal or energisation of a single coil system

Definitions

  • the utility model relates to a vibration motor, in particular to a linear vibration motor used for portable consumer electronic products.
  • vibration motors for system feedback, such as mobile phone Call reminder, information reminder, navigation reminder, game machine vibration feedback, etc.
  • system feedback such as mobile phone Call reminder, information reminder, navigation reminder, game machine vibration feedback, etc.
  • a linear vibration motor in the related art includes a housing with a receiving space, a vibration unit placed in the receiving space, an elastic member that suspends the vibration unit in the receiving space, and is fixed to the housing And a coil assembly that drives the vibration unit to vibrate;
  • the vibration unit includes a mass block fixedly supported by the elastic member, a pole core embedded in the mass block surrounded by a side wall in a ring shape, and fixed to the Describe the two magnets inside the pole core.
  • the magnetic steel is directly glued to the inner side of the pole core.
  • the magnetic steel lacks support and is easily detached during vibration, which affects all Describe the reliability of linear vibration motor vibration.
  • the utility model aims to provide a linear vibration motor with simple assembly, high assembly accuracy and high vibration reliability.
  • the present invention provides a linear vibration motor, which includes a housing with an accommodation space, a vibration unit disposed in the accommodation space, and an elasticity for suspending the vibration unit in the accommodation space And a coil assembly fixed to the housing and driving the vibration unit to vibrate.
  • the vibration unit includes a mass block fixedly supported by the elastic member and having a through hole, a pole core accommodated in the through hole, and A magnetic steel fixed to the pole core, the coil assembly is inserted in the through hole and spaced apart from the magnetic steel;
  • the pole core includes a body portion fixed to the mass and a body Positioning portions extending toward the coil assembly on opposite sides of the vertical vibration direction respectively, the positioning portion includes a first positioning arm and a second positioning arm spaced apart from the first positioning arm, the magnetic steel clip It is provided between the first positioning arm and the second positioning arm.
  • the pole core is ring-shaped and the orthographic projection along the vertical vibration direction is rectangular, and the body portion includes two long side walls parallel to its long axis direction and two short sides parallel to its short axis direction
  • the first positioning arm and the second positioning arm are provided on the long side wall.
  • the first positioning arm and the second positioning arm are respectively provided at opposite ends of the long side wall along the vertical vibration direction.
  • the housing includes a bottom plate and an upper cover provided on the bottom plate and enclosing the receiving space together; the elastic member is fixed inside the upper cover and suspends the vibration unit on the In the upper cover, the coil assembly is fixed to the bottom plate.
  • both the first positioning arm and the second positioning arm are parallel to the bottom plate.
  • the first positioning arm extends from the long side wall toward the coil assembly and toward the bottom plate, and the second positioning arm extends toward the coil assembly and away from the bottom plate.
  • the orthographic projection of the first positioning arm along the vertical vibration direction completely coincides with the orthographic projection of the second positioning arm along the vertical vibration direction.
  • the orthographic projection of the first positioning arm along the vertical vibration direction and the orthographic projection of the second positioning arm along the vertical vibration direction are spaced apart from each other.
  • first positioning arms there are a plurality of first positioning arms, and the plurality of first positioning arms are spaced apart from each other.
  • the plurality of second positioning arms are spaced apart from each other.
  • the pole core includes a body portion fixed to the mass and positioning portions respectively extending from opposite sides of the body toward the direction of the coil assembly ,
  • the positioning part includes a first positioning arm and a second positioning arm spaced apart from the first positioning arm, the magnetic steel clip is disposed between the first positioning arm and the second positioning arm;
  • the positioning part directly fixes the magnetic steel in the glued position, realizing accurate positioning of the magnetic steel, improving assembly accuracy, and eliminating the need for the magnetic steel and the pole core
  • the alignment work between them reduces the difficulty of assembly and makes assembly simple; at the same time, the positioning part provides support for the magnetic steel, which makes the assembly of the magnetic steel and the pole core more reliable and avoids the magnetic
  • the phenomenon of the steel falling off during the vibration process makes the linear vibration motor highly reliable in vibration.
  • Figure 1 is a perspective structural view of a linear vibration motor of 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
  • Figure 3 is a cross-sectional view taken along line A-A in Figure 1;
  • FIG. 4 is a schematic view of the stereo structure of the pole core of the utility model
  • Fig. 5 is an assembly diagram of part of the structure of the linear vibration motor of the present invention.
  • the present invention provides a linear vibration motor 100 including a housing 1 with a receiving space 10, a vibration unit 2, an elastic member 3 and a coil assembly 4.
  • the housing 1 includes a bottom plate 11 and an upper cover 12 that is disposed on the bottom plate 11 and surrounds the receiving space 10 together.
  • the vibration unit 2 is placed in the receiving space 10.
  • the vibration unit 2 is supported and suspended in the accommodation space 10 by the elastic member 3, and the coil assembly 4 is used to drive the vibration unit 2 to vibrate.
  • the vibration unit 2 includes a mass 21 fixedly supported by the elastic member 3 and having a through hole 210, a pole core 22 accommodated in the through hole 210, and a magnetic steel fixed to the pole core 22 23, the coil assembly 4 is inserted into the through hole 210 and is spaced apart from the magnetic steel 23.
  • the magnetic steel 23 includes two and is respectively fixed on opposite sides of the pole core 22, and the coil assembly 4 extends between the two magnetic steels 23.
  • the pole core 22 includes an annular body portion 221 fixed to the mass 21 and positioning portions 220 extending from the body portion 221 on opposite sides of the vertical vibration direction toward the coil assembly 4 respectively;
  • the positioning portion 220 includes two and is located on opposite sides of the body portion 221 respectively.
  • Each positioning portion 220 includes a first positioning arm 2201 and a second spaced apart from the first positioning arm 2201 Positioning arm 2202; the first positioning arm 2201 and the second positioning arm 2202 are both parallel to the bottom plate 11, and the first positioning arm 2201 on the same side along the orthographic projection perpendicular to the vibration direction is The orthographic projections of the second positioning arm 2202 in the direction perpendicular to the vibration direction completely coincide. More specifically, the first positioning arm 2201 and the second positioning arm 2202 are respectively disposed at opposite ends of the long side wall along the vertical vibration direction.
  • the specific directions, the positional relationship and the number of the first positioning arm 2201 and the second positioning arm 2202 on the same side are not limited thereto, and the first positioning arm 2201 is from the long side
  • the wall 2211 extends toward the coil assembly 4 and toward the bottom plate 11, and the second positioning arm 2202 extends toward the coil assembly 4 and away from the bottom plate 11.
  • the first positioning arm is also feasible.
  • the orthographic projection of 2201 along the vertical vibration direction and the orthographic projection of the second positioning arm 2202 along the vertical vibration direction can also be arranged at intervals; the first positioning arm 2201 and the second positioning arm 2202 are respectively several
  • the first positioning arms 2201 are spaced apart from each other, and it is also feasible that the plurality of second positioning arms 2202 are spaced apart from each other.
  • the mass 21 includes a first wall 211 and a second wall 212 opposite to the direction crossing the vibration direction; the orthographic projection of the body 221 along the direction perpendicular to the vibration direction is rectangular, and the body
  • the portion 221 includes two long side walls 2211 parallel to its long axis direction and two short side walls 2212 parallel to its short axis direction.
  • the long side walls 2211 are provided parallel to the vibration direction of the vibration unit 2.
  • the first positioning arm 2201 and the second positioning arm 2202 are provided on the long side wall 2211.
  • the position of the positioning part 220 is not limited to this, the positioning part 220 is provided on the short side wall 2212, that is, the first positioning arm 2201 and the second positioning arm 2202 are provided It is also feasible for the short side wall 2212; the number of the positioning portion 220 is not limited to this, the positioning portion 220 includes four and is disposed around the body portion 221, two of which are respectively disposed on the two The two long side walls 2211, and the other two are respectively disposed on the two short side walls 2212.
  • the magnetic steel 23 is sandwiched between the first positioning arm 2201 and the second positioning arm 2202 of the positioning portion 220 on the same side as the gap, and is fixedly connected to the body 221 Specifically, the magnetic steel 23 is fixed at the glue position of the long side wall 2211 on this side, to achieve precise positioning between the magnetic steel 23 and the long side wall 2211, the magnetic steel 23 may It directly forms a glue with the long side wall 2211.
  • the positioning part 220 directly fixes the magnetic steel 23 in the glued position, realizing precise positioning of the magnetic steel 23 and improving assembly accuracy, and The alignment work between the magnetic steel 23 and the pole core 22 is omitted, which reduces the difficulty of assembly and makes assembly simple; meanwhile, the positioning part 220 provides support for the magnetic steel 23 so that the The assembly of the magnetic steel 23 and the pole core 22 is more reliable, and the phenomenon that the magnetic steel 23 falls off during vibration is avoided, so that the vibration reliability of the linear vibration motor 100 is high.
  • the elastic member 3 suspends the vibration unit 2 in the receiving space 10. That is, one end of the elastic member 3 is fixed to the vibration unit 2 and one end is fixed to the housing 1, specifically, fixed in the upper cover 12 of the housing 1 and suspending the vibration unit 2 Inside the upper cover 12.
  • the elastic member 3 includes a first elastic member 31 and a second elastic member 32 respectively disposed on opposite sides of the mass 21 along the vibration direction.
  • the arrangement of the double elastic member structure can make the vibration effect of the linear vibration motor 100 more balanced and more reliable.
  • the first elastic member 31 includes a first elastic arm 311, a first fixed arm 312 and a first connecting arm 313 that are bent and extended in the same direction from both ends of the first elastic arm 311, respectively.
  • the first fixing arm 312 is fixed to the first wall 211
  • the first elastic arm 311 is spaced apart from the mass 21, and the first connecting arm 313 is fixed to the housing 1 and the The opposite side of the second wall 212.
  • the second elastic member 32 includes a second elastic arm 321, a second fixed arm 322 and a second connecting arm 323 that are bent and extended in the same direction from both ends of the second elastic arm 321, respectively.
  • the second fixing arm 322 is fixed to the second wall 212
  • the second elastic arm 321 is spaced apart from the mass 21
  • the second connecting arm 323 is fixed to the housing 1 and the The opposite side of the first wall 211.
  • the first elastic member 31 and the second elastic member 32 sandwich and suspend the vibration unit 2 in the accommodation space 10 to provide vibration conditions for the vibration unit 2.
  • the linear vibration motor 100 further includes at least two first reinforcing blocks 6 and two second reinforcing blocks 7.
  • One of the first reinforcing blocks 6 is located on the side of the first connecting arm 313 close to the second wall 212 and fixes the first connecting arm 313 to the housing 1; the other The first reinforcing block 6 is located on the side of the second connecting arm 323 close to the first wall 211 and fixes the second connecting arm 323 to the housing 1.
  • the two second reinforcing blocks 7 are respectively located on the sides of the first fixing arm 312 and the second fixing arm 322 close to the housing 1, and the two second reinforcing blocks 7 separate the first A fixing arm 312 and the second fixing arm 322 are respectively fixed to the first wall 211 and the second wall 212.
  • the coil assembly 4 is fixed to the housing 1 and drives the vibration unit 2 to vibrate.
  • the coil assembly 4 extends between the two magnetic steels 23 and The magnetic steel 23 is arranged at intervals; in this embodiment, the coil assembly 4 is fixed to the bottom plate 11.
  • the coil assembly 4 includes an iron core 41 fixed to the housing 1 and a coil 42 wound around the iron core 41.
  • the coil assembly 4 is specifically fixedly installed on the bottom plate 11, and is arranged at a distance from the two magnetic steels 23. After the coil 42 is energized, the iron core 41 forms a magnetic field and communicates with all The magnetic field of the magnetic steel 23 interacts to drive the reciprocating linear motion of the vibration unit 2 to produce a vibration effect.
  • the pole core includes a body portion fixed to the mass and positioning portions respectively extending from opposite sides of the body toward the direction of the coil assembly ,
  • the positioning part includes a first positioning arm and a second positioning arm spaced apart from the first positioning arm, the magnetic steel is sandwiched between the first positioning arm and the second positioning arm;
  • the positioning part directly fixes the magnetic steel in the glued position, realizing accurate positioning of the magnetic steel, improving assembly accuracy, and eliminating the need for the magnetic steel and the pole core
  • the alignment work between them reduces the difficulty of assembly and makes assembly simple; at the same time, the positioning part provides support for the magnetic steel, which makes the assembly of the magnetic steel and the pole core more reliable and avoids the magnetic
  • the phenomenon of the steel falling off during the vibration process makes the linear vibration motor highly reliable in vibration.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mechanical Engineering (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)

Abstract

一种线性振动电机，其包括具有收容空间（10）的壳体（1）、置于收容空间（10）内的振动单元（2）、将振动单元（2）悬置于收容空间（10）的弹性件（3）以及固定于壳体（1）并驱动振动单元（2）振动的线圈组件（4），振动单元（2）包括固定支撑于弹性件（3）且具有通孔（210）的质量块（21）、收容于通孔（210）内的极芯（22）以及固定于极芯（22）的磁钢（23），线圈组件（4）插设于通孔（210）内且与磁钢（23）间隔设置；极芯（22）包括固定于质量块（21）的本体部（221）和由本体部（221）沿垂直振动方向的相对两侧分别朝向线圈组件（4）延伸的定位部（220），定位部（220）包括第一定位臂（2201）和与第一定位臂（2201）间隔设置的第二定位臂（2202），磁钢（23）夹设于第一定位臂（2201）和第二定位臂（2202）之间。该线性振动电机装配简单、装配精度高且振动可靠性高。

Description

线性振动电机 技术领域
本实用新型涉及一种振动电机，尤其涉及一种用于便携式消费性电子产品的线性振动电机。
 背景技术
随着电子技术的发展，便携式消费性电子产品越来越受人们的追捧，如手机、掌上游戏机、导航装置或掌上多媒体娱乐设备等，一般都会用到振动电机来做系统反馈，比如手机的来电提示、信息提示、导航提示、游戏机的振动反馈等。如此广泛的应用，就要求振动电机的性能高，稳定性好且使用寿命长。
相关技术中的线性振动电机，其包括具有收容空间的壳体、置于所述收容空间内的振动单元、将所述振动单元悬置于所述收容空间的弹性件以及固定于所述壳体并驱动所述振动单元振动的线圈组件；所述振动单元包括固定支撑于所述弹性件的质量块、嵌设于所述质量块内的由侧壁围成环状的极芯以及固定于所述极芯内侧的两个磁钢。
 技术问题
然而，相关技术中，在装配所述磁钢的过程中，需要先对所述磁钢和所述极芯进行对位工作，而对位工作容易产生对位的偏差，使得难以保证所述磁钢的所述极芯之间的装配精度，而且使得装配难度高；另外，所述磁钢直接胶合于所述极芯内侧，所述磁钢缺乏支撑，在振动过程中容易脱落，影响了所述线性振动电机振动的可靠性。
因此，实有必要提供一种新的线性振动电机来解决上述问题。
 技术解决方案
本实用新型的目的在于提供一种装配简单、装配精度高且振动可靠性高的线性振动电机。
为解决上述技术问题，本实用新型提供一种线性振动电机，其包括具有收容空间的壳体、置于所述收容空间内的振动单元、将所述振动单元悬置于所述收容空间的弹性件以及固定于所述壳体并驱动所述振动单元振动的线圈组件，所述振动单元包括固定支撑于所述弹性件且具有通孔的质量块、收容于所述通孔内的极芯以及固定于所述极芯的磁钢，所述线圈组件插设于所述通孔内且与所述磁钢间隔设置；所述极芯包括固定于所述质量块的本体部和由所述本体部沿垂直振动方向的相对两侧分别朝向所述线圈组件延伸的定位部，所述定位部包括第一定位臂和与所述第一定位臂间隔设置的第二定位臂，所述磁钢夹设于所述第一定位臂和所述第二定位臂之间。
优选的，所述极芯呈环状且沿垂直振动方向的正投影呈矩形，所述本体部包括平行于其长轴方向的两个长侧壁和平行于其短轴方向的两个短侧壁，所述第一定位臂和所述第二定位臂设于所述长侧壁。
优选的，所述第一定位臂以及所述第二定位臂分别设于所述长侧壁沿垂直振动方向的相对两端。
优选的，所述壳体包括底板以及盖设于所述底板并共同围成所述收容空间的上盖；所述弹性件固定于所述上盖内侧并将所述振动单元悬置于所述上盖内，所述线圈组件固定于所述底板。
优选的，所述第一定位臂和所述第二定位臂均平行于所述底板。
优选的，所述第一定位臂自所述长侧壁朝向所述线圈组件且朝向所述底板方向延伸，所述第二定位臂朝向所述线圈组件且远离所述底板方向延伸。
优选的，所述第一定位臂沿垂直振动方向的正投影与所述第二定位臂沿垂直振动方向的正投影完全重合。
优选的，所述第一定位臂沿垂直振动方向的正投影与所述第二定位臂沿垂直振动方向的正投影相互间隔。
优选的，所述第一定位臂为若干个，若干个所述第一定位臂相互间隔设置。
优选的，所述第二定位臂为若干个，若干个所述第二定位臂相互间隔设置。
 有益效果
与相关技术相比，本实用新型提供的线性振动电机中，所述极芯包括固定于所述质量块的本体部和由所述本体的相对两侧分别朝向所述线圈组件方向延伸的定位部，所述定位部包括第一定位臂和与所述第一定位臂间隔设置的第二定位臂，所述磁钢夹设于所述第一定位臂和所述第二定位臂之间；在装配工过程中，所述定位部直接将所述磁钢的固定在胶合位置，实现了所述磁钢的精确定位，提高了装配精度，而且省去了对所述磁钢与所述极芯之间的对位工作，降低了装配难度，使得装配简单；同时，所述定位部为所述磁钢提供支撑，使得所述磁钢与所述极芯的装配更加可靠，避免了所述磁钢在振动过程中发生脱落的现象，从而使得所述线性振动电机的振动可靠性高。
 附图说明
为了更清楚地说明本实用新型实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本实用新型的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其它的附图，其中：
图1为本实用新型线性振动电机的立体结构图；
图2为本实用新型线性振动电机的部分立体结构分解图；
图3为沿图1中A-A线的剖示图；
图4为本实用新型的极芯的立体结构示意图；
图5为本实用新型线性振动电机的部分结构装配图。
 本发明的实施方式
下面将结合本实用新型实施例中的附图，对本实用新型实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本实用新型的一部分实施例，而不是全部的实施例。基于本实用新型中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本实用新型保护的范围。
请同时参阅图1~2所示，本实用新型提供了一种线性振动电机100，其包括具有收容空间10的壳体1、振动单元2、弹性件3以及线圈组件4。
所述壳体1包括底板11和盖设于所述底板11并共同围成所述收容空间10的上盖12。
请同时参阅图2~4所示，所述振动单元2置于所述收容空间10内。本实施方式中，所述振动单元2通过所述弹性件3支撑悬置于所述收容空间10内，所述线圈组件4用以驱动所述振动单元2振动。
具体的，所述振动单元2包括固定支撑于所述弹性件3且具有通孔210的质量块21、收容于所述通孔210内的极芯22以及固定于所述极芯22的磁钢23，所述线圈组件4插设于所述通孔210内且与所述磁钢23间隔设置。
本实施方式中，所述磁钢23包括两个且分别固定于所述极芯22的相对两侧，所述线圈组件4延伸至两个所述磁钢23之间。
所述极芯22包括固定于所述质量块21的呈环状的本体部221和由所述本体部221沿垂直振动方向的相对两侧分别朝向所述线圈组件4延伸的定位部220；具体的，所述定位部220包括两个且分别位于所述本体部221的相对两侧，每一所述定位部220包括第一定位臂2201和与所述第一定位臂2201间隔设置的第二定位臂2202；所述第一定位臂2201和所述第二定位臂2202均平行于所述底板11，且位于同一侧的所述第一定位臂2201沿垂直所述振动方向的正投影与所述第二定位臂2202沿垂直所述振动方向的正投影完全重合。更具体的，所述第一定位臂2201与所述第二定位臂2202分别设于所述长侧壁沿垂直振动方向的相对两端。
当然，位于同一侧的所述第一定位臂2201与所述第二定位臂2202具体的方向、两者之间的位置关系以及数量不限于此，所述第一定位臂2201自所述长侧壁2211朝向所述线圈组件4且朝向所述底板11方向延伸形成，所述第二定位臂2202朝向所述线圈组件4且远离所述底板11方向延伸形成也是可行的；所述第一定位臂2201沿垂直振动方向的正投影与所述第二定位臂2202沿垂直振动方向的正投影也可以相互间隔设置；所述第一定位臂2201和所述第二定位臂2202分别为若干个，若干个所述第一定位臂2201相互间隔设置，若干个所述第二定位臂2202相互间隔设置也是可行的。
进一步的，所述质量块21包括沿与所述振动方向交叉的方向相对设置的第一壁211和第二壁212；所述本体221沿垂直所述振动方向的正投影呈矩形，所述本体部221包括平行于其长轴方向的两个长侧壁2211和平行于其短轴方向的两个短侧壁2212，所述长侧壁2211平行于所述振动单元2的振动方向设置，所述第一定位臂2201和所述第二定位臂2202设于所述长侧壁2211。
当然，需要说明的是，所述定位部220设置的位置不限于此，所述定位部220设置于所述短侧壁2212，即所述第一定位臂2201和所述第二定位臂2202设于所述短侧壁2212也是可行的；所述定位部220设置的数量不限于此，所述定位部220包括四个且环绕所述本体部221设置也是可行的，其中两个分别设置于两个所述长侧壁2211，另外两个分别设置于两个所述短侧壁2212。
上述结构中，所述磁钢23夹设于与其同侧的所述定位部220的所述第一定位臂2201和所述第二定位臂2202之间形成间隙配合且固定连接于所述本体221，具体为将所述磁钢23固定在该侧的所述长侧壁2211的胶合位置上，实现所述磁钢23与所述长侧壁2211之间的精确定位，所述磁钢23可直接与所述长侧壁2211形成胶合。
通过所述定位部220的设置，在装配工过程中，所述定位部220直接将所述磁钢23的固定在胶合位置，实现了所述磁钢23的精确定位，提高了装配精度，而且省去了对所述磁钢23与所述极芯22之间的对位工作，降低了装配难度，使得装配简单；同时，所述定位部220为所述磁钢23提供支撑，使得所述磁钢23与所述极芯22的装配更加可靠，避免了所述磁钢23在振动过程中发生脱落的现象，从而使得所述线性振动电机100的振动可靠性高。
请参阅图2及图5所示，所述弹性件3将所述振动单元2悬置于所述收容空间10内。即所述弹性件3一端固定于所述振动单元2，一端固定于所述壳体1，具体为固定于所述壳体1的所述上盖12内且将所述振动单元2悬置于所述上盖12内。
本实施方式中，所述弹性件3包括沿所述振动方向分别设置于所述质量块21相对两侧的第一弹性件31和第二弹性件32。双弹性件结构的设置可使所述线性振动电机100的振动效果更平衡，可靠性更好。
所述第一弹性件31包括第一弹臂311、由所述第一弹臂311的两端分别同向弯折延伸的第一固定臂312和第一连接臂313。所述第一固定臂312固定于所述第一壁211，所述第一弹臂311与所述质量块21间隔设置，所述第一连接臂313固定于所述壳体1的与所述第二壁212相对的一侧。
所述第二弹性件32包括第二弹臂321、由所述第二弹臂321的两端分别同向弯折延伸的第二固定臂322和第二连接臂323。所述第二固定臂322固定于所述第二壁212，所述第二弹臂321与所述质量块21间隔设置，所述第二连接臂323固定于所述壳体1的与所述第一壁211相对的一侧。上述结构中，所述第一弹性件31与所述第二弹性件32将所述振动单元2夹设悬置于收容空间10内，为所述振动单元2提供振动条件。
更优的，为了加强所述弹性件3的固定强度，所述线性振动电机100还包括至少两个第一加强块6和两个所述第二加强块7。
其中一个所述第一加强块位6于所述第一连接臂313的靠近所述第二壁212的一侧并将所述第一连接臂313固定于所述壳体1；另一个所述第一加强块6位于所述第二连接臂323的靠近所述第一壁211的一侧并将所述第二连接臂323固定于所述壳体1。
两个所述第二加强块7分别位于所述第一固定臂312和所述第二固定臂322的靠近所述壳体1的一侧，两个所述第二加强块7将所述第一固定臂312和所述第二固定臂322分别固定于所述第一壁211和所述第二壁212。
请参阅图2及图3所示，所述线圈组件4固定于所述壳体1并驱动所述振动单元2振动，所述线圈组件4延伸至两个所述磁钢23之间且与所述磁钢23间隔设置；本实施方式中，所述线圈组件4固定于所述底板11。
具体的，所述线圈组件4包括固定于所述壳体1的铁芯41和绕设于所述铁芯41的线圈42。
本实施方式中，所述线圈组件4具体固定安装于所述底板11，其与两个所述磁钢23正对间隔设置，所述线圈42通电后，所述铁芯41形成磁场并与所述磁钢23的磁场相互作用，从而驱动所述振动单元2往复直线运动，产生振动效果。
与相关技术相比，本实用新型提供的线性振动电机中，所述极芯包括固定于所述质量块的本体部和由所述本体的相对两侧分别朝向所述线圈组件方向延伸的定位部，所述定位部包括第一定位臂和与所述第一定位臂间隔设置的第二定位臂，所述磁钢夹设于所述第一定位臂和所述第二定位臂之间；在装配工过程中，所述定位部直接将所述磁钢的固定在胶合位置，实现了所述磁钢的精确定位，提高了装配精度，而且省去了对所述磁钢与所述极芯之间的对位工作，降低了装配难度，使得装配简单；同时，所述定位部为所述磁钢提供支撑，使得所述磁钢与所述极芯的装配更加可靠，避免了所述磁钢在振动过程中发生脱落的现象，从而使得所述线性振动电机的振动可靠性高。
以上所述的仅是本实用新型的实施方式，在此应当指出，对于本领域的普通技术人员来说，在不脱离本实用新型创造构思的前提下，还可以做出改进，但这些均属于本实用新型的保护范围。

Claims (10)

  1. 一种线性振动电机，其包括具有收容空间的壳体、置于所述收容空间内的振动单元、将所述振动单元悬置于所述收容空间的弹性件以及固定于所述壳体并驱动所述振动单元振动的线圈组件，所述振动单元包括固定支撑于所述弹性件且具有通孔的质量块、收容于所述通孔内的极芯以及固定于所述极芯的磁钢，所述线圈组件插设于所述通孔内且与所述磁钢间隔设置，其特征在于，所述极芯包括固定于所述质量块的本体部和由所述本体部沿垂直振动方向的相对两侧分别朝向所述线圈组件延伸的定位部，所述定位部包括第一定位臂和与所述第一定位臂间隔设置的第二定位臂，所述磁钢夹设于所述第一定位臂和所述第二定位臂之间。
  2. 根据权利要求1所述的线性振动电机，其特征在于，所述极芯呈环状且沿垂直振动方向的正投影呈矩形，所述本体部包括平行于其长轴方向的两个长侧壁和平行于其短轴方向的两个短侧壁，所述第一定位臂和所述第二定位臂设于所述长侧壁。
  3. 根据权利要求2所述的线性振动电机，其特征在于，所述第一定位臂以及所述第二定位臂分别设于所述长侧壁沿垂直振动方向的相对两端。
  4. 根据权利要求2所述的线性振动电机，其特征在于，所述壳体包括底板以及盖设于所述底板并共同围成所述收容空间的上盖；所述弹性件固定于所述上盖内侧并将所述振动单元悬置于所述上盖内，所述线圈组件固定于所述底板。
  5. 根据权利要求4所述的线性振动电机，其特征在于，所述第一定位臂和所述第二定位臂均平行于所述底板。
  6. 根据权利要求4所述的线性振动电机，其特征在于，所述第一定位臂自所述长侧壁朝向所述线圈组件且朝向所述底板方向延伸，所述第二定位臂朝向所述线圈组件且远离所述底板方向延伸。
  7. 根据权利要求1所述的线性振动电机，其特征在于，所述第一定位臂沿垂直振动方向的正投影与所述第二定位臂沿垂直振动方向的正投影完全重合。
  8. 根据权利要求1所述的线性振动电机，其特征在于，所述第一定位臂沿垂直振动方向的正投影与所述第二定位臂沿垂直振动方向的正投影相互间隔。
  9. 根据权利要求1所述的线性振动电机，其特征在于，所述第一定位臂为若干个，若干个所述第一定位臂相互间隔设置。
  10. 根据权利要求1所述的线性振动电机，其特征在于，所述第二定位臂为若干个，若干个所述第二定位臂相互间隔设置。
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