WO2018157515A1 - 用于线性振动马达的壳体以及线性振动马达 - Google Patents

用于线性振动马达的壳体以及线性振动马达 Download PDF

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Publication number
WO2018157515A1
WO2018157515A1 PCT/CN2017/089572 CN2017089572W WO2018157515A1 WO 2018157515 A1 WO2018157515 A1 WO 2018157515A1 CN 2017089572 W CN2017089572 W CN 2017089572W WO 2018157515 A1 WO2018157515 A1 WO 2018157515A1
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Prior art keywords
wall
vibration motor
linear vibration
elastic piece
housing
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PCT/CN2017/089572
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English (en)
French (fr)
Inventor
朱跃光
毛东升
臧玮晔
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歌尔股份有限公司
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Application filed by 歌尔股份有限公司 filed Critical 歌尔股份有限公司
Publication of WO2018157515A1 publication Critical patent/WO2018157515A1/zh

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/02—Casings or enclosures characterised by the material thereof
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof

Definitions

  • the present invention relates to the field of vibration device technology, and more particularly to a housing for a linear vibration motor and a linear vibration motor.
  • the Lorentz force formed by the coil and the magnet provides a driving force for vibrator vibration.
  • the internal space of the housing is limited, the height is usually small, and the vibration effect is poor.
  • the shrapnel is usually located on the upper and lower sides of the vibration direction, and the thickness of the shrapnel also occupies the inner space of the casing, so that the space for vibrating the vibrator is further reduced.
  • a housing for a linear vibration motor includes a housing wall and a resilient piece for providing an elastic restoring force to the vibrator of the linear vibration motor, the housing wall enclosing a cavity, the housing wall having a hollowed out region for communicating the inner cavity with the outside, The hollow region is located in a vibration direction, the elastic piece is coupled to the casing wall and extends into the inner cavity, and the elastic piece is configured to be embedded in the hollowed out area when compressed.
  • the elastic piece is coupled to an edge of the hollowed out area.
  • the plurality of elastic pieces are multiple.
  • the shell wall comprises a top wall, a bottom wall and a side wall, the three are enclosed together to form the inner cavity, the top wall is parallel to the bottom wall, and the vibrator is perpendicular to the top The wall vibrates, the hollow region being disposed on at least one of the top wall and the bottom wall.
  • the number of the hollowed out areas is two, wherein the first hollow area is located at the top wall, and the second hollow area is located at the bottom wall, and the elastic piece is two, wherein the first elastic piece is connected to the edge of the first hollow area, Two The elastic piece is connected to the edge of the second hollow area, and the first elastic piece and the second elastic piece extend in opposite directions.
  • the hollow region extends from the top wall and/or the bottom wall to the side wall, and the elastic piece is connected to an edge located at the side wall.
  • the shell wall is made of a magnetically permeable material, and the side wall is convex toward the inner cavity to form a pole core of the linear vibration motor.
  • the elastic piece is integrally formed with the shell wall.
  • a linear vibration motor is provided.
  • the linear vibration motor motor includes the housing provided by the present invention.
  • a linear vibration motor includes the housing provided by the present invention, the housing wall is made of a magnetically permeable material, and a pole core of the linear vibration motor is connected to the side wall and perpendicular to the side wall. A coil of the linear vibration motor is disposed around the pole core.
  • the inventors of the present invention have found that in the prior art, the thickness of the elastic piece occupies the internal space of the casing, so that the vibration effect of the linear vibration motor is poor. Therefore, the technical task to be achieved by the present invention or the technical problem to be solved is not thought of or expected by those skilled in the art, so the present invention is a new technical solution.
  • the shell wall has a hollowed out area, and the elastic piece can be embedded in the hollowed out area when compressed.
  • the thickness of the shrapnel does not occupy the space in the direction of vibration, thereby providing more space for the vibration of the vibrator.
  • the space inside the casing is fully utilized, and the casing can be made thinner, which is in line with the trend of thinning and miniaturization of electronic equipment.
  • the integration is increased and the amount of material of the linear vibration motor is reduced.
  • FIG. 1 is a schematic structural view of a housing in accordance with an embodiment of the present invention.
  • FIG. 2 is a schematic structural view of a housing in accordance with another embodiment of the present invention.
  • FIG 3 is an exploded view of a linear vibration motor in accordance with an embodiment of the present invention.
  • FIG. 4 is a cross-sectional view of a linear vibration motor in accordance with an embodiment of the present invention.
  • Figure 5 is a cross-sectional view of another angle of a linear vibration motor in accordance with one embodiment of the present invention.
  • Figure 6 is a schematic diagram of a linear vibration motor in accordance with one embodiment of the present invention.
  • Figure 7 is a schematic diagram of a linear vibration motor in accordance with another embodiment of the present invention.
  • 11 pole core; 12: raised portion; 13: side wall; 14: top wall; 15: bottom wall; 16: first shrapnel; 17: second shrapnel; 18: first hollow area; 19: second hollow Zone; 20: coil; 21: permanent magnet; 22: tungsten steel block; 23: FPCB.
  • a housing for a linear vibration motor includes a housing wall and a spring for providing an elastic restoring force to the vibrator of the linear vibration motor.
  • Shell wall enclosure Into the lumen.
  • the inner cavity is for accommodating components such as a vibrator and a stator.
  • the shell wall has a hollowed out area for connecting the inner cavity to the outside, and the hollowed out area is located in the vibration direction.
  • the direction of vibration is the direction in which the vibrator vibrates.
  • the shrapnel is coupled to the shell wall and extends into the lumen.
  • the shrapnel also includes a connection end for connection to the vibrator.
  • the connection point of the spring piece to the housing is located on the inner side, the outer side or other parts of the shell wall.
  • the shrapnel can be connected to any position of the shell wall as long as it can provide elastic restoring force to the vibrator.
  • the shrapnel is joined to the edge of the cutout. In this way, you can save more space.
  • the shrapnel is configured to be embedded in the hollowed out area when compressed.
  • the shell wall has a hollowed out area, and the elastic piece can be embedded in the hollowed out area when compressed.
  • the thickness of the shrapnel does not occupy the space in the direction of vibration, thereby providing more space for the vibration of the vibrator.
  • the space inside the casing is fully utilized, and the casing can be made thinner, which is in line with the trend of thinning and miniaturization of electronic equipment.
  • the integration is increased and the amount of material of the linear vibration motor is reduced.
  • the shrapnel is multiple.
  • the shrapnel is 2 and arranged opposite each other.
  • the vibrator is located between the two shrapnels. In this way, it is possible to provide a greater elastic restoring force for the linear vibration motor, which is advantageous for adjusting F 0 .
  • a plurality of shrapnel can also be placed on the same side of the vibrator.
  • the elastic piece is integrally formed with the shell wall.
  • a shrapnel is directly opened on the shell wall by cutting, stamping, or the like. In this way, the processing method of the housing is simplified.
  • the connection between the shrapnel and the shell wall is stronger, the structural strength is high, and the durability is good.
  • FIG. 1 is a schematic structural view of a housing in accordance with an embodiment of the present invention.
  • the shell wall includes a top wall 14, a bottom wall 15, and side walls 13, which are enclosed together to form an internal cavity.
  • the top wall 14 is parallel to the bottom wall 15.
  • the vibrator vibrates perpendicular to the top wall 14.
  • the direction of vibration is perpendicular to the top wall 14 and the bottom wall 15.
  • the hollowed out area is disposed on at least one of the top wall 14 and the bottom wall 15.
  • the shape of the housing may be, but not limited to, a square, a circle, other polygons, or an irregular shape.
  • the casing is a rectangular parallelepiped and the side walls 13 are four.
  • Side wall 13 along the length direction is used for fixing Fixed stator.
  • the stator includes a pole core 11 and a coil 20 disposed around the pole core 11, and the pole core 11 is fixed to the side wall 13 along the length direction.
  • the side wall 13 in the width direction is used to provide an FPCB 23 (flexible wiring board) for the coil 20 to be electrically connected to an external circuit.
  • the lead of the coil 20 is connected to the FPCB 23, and the FPCB 23 is connected to the main control chip.
  • the length direction that is, the extension of the longest side of the rectangular parallelepiped is reversed, and the width direction is the direction in which the side perpendicular to the vibration direction and connected to the longest side extends.
  • a hollowed out area is provided on the top wall 14, and the shrapnel is one and connected to the side of the hollowed out area.
  • a hollowed out area is provided on the bottom wall 15, and the shrapnel is one and connected to the side of the hollowed out area.
  • a hollowed out region that is, a first hollow region 18 at the top wall 14 and a second hollow region 19 at the bottom wall 15 are provided on both the top wall 14 and the bottom wall 15.
  • the elastic pieces are two, that is, the first elastic piece 16 and the second elastic piece 17, wherein the first elastic piece 16 is connected to the side of the first hollow area 18, and the second elastic piece 17 is connected to the side of the second hollow area 19.
  • the first elastic piece 16 is opposite to the extending direction of the second elastic piece 17.
  • the direction of extension is the direction from the connection point of the shrapnel for connection to the casing wall to the connection end for connection to the vibrator.
  • the first elastic piece 16 and the second elastic piece 17 are disposed on the casing wall by welding.
  • the first elastic piece 16 and the second elastic piece 17 are cut out by cutting, for example, plasma cutting, on the top wall 14 and the side wall 13, respectively. In this way, it is not necessary to separately provide the elastic piece, which simplifies the processing and assembly of the housing.
  • the connection between the shrapnel and the shell wall is stronger and the structural strength is higher.
  • the two shrapnels are respectively located on the upper and lower sides of the vibrator in the direction of vibration. In this way, the force of the vibrator can be more balanced to avoid polarization.
  • FIG. 2 is a schematic structural view of a housing in accordance with another embodiment of the present invention.
  • the hollowed out region extends from the top wall 14 and/or the bottom wall 15 to the side wall 13 and the shrapnel is joined to the side of the side wall 13.
  • This structure effectively lengthens the length of the elastic piece, can improve the stress of the elastic piece, and makes the elastic recovery force of the elastic piece stronger.
  • the shrapnel has a higher bending resistance, is less prone to plastic deformation, and has a long service life of the shrapnel.
  • this configuration facilitates the adjustment of F 0 of the linear vibration motor.
  • the first hollow region 18 extends to one side wall 13 in the width direction
  • the second hollow portion 19 extends to the other side wall 13 in the width direction.
  • the shrapnel can be embedded in two hollow areas respectively.
  • a linear vibration motor is provided.
  • FIG 3 is an exploded view of a linear vibration motor in accordance with an embodiment of the present invention.
  • the linear vibration motor includes a vibrator, a stator, and a housing provided by the present invention.
  • the vibrator includes a tungsten steel block 22 and a permanent magnet 21 connected to the tungsten steel block 22.
  • the stator includes a pole core 11 and a coil 20 disposed around the pole core 11. The stator and the vibrator are disposed in the inner cavity of the housing, and the stator and the connecting end of the elastic piece are coupled together. The stator is suspended in the inner cavity.
  • the permanent magnet 21 interacts with the coil 20 to generate a Lorentz force. The Lorentz force drives the vibrator to vibrate.
  • the linear vibration motor has a good vibration effect.
  • the shell wall is made of a magnetically permeable material that is raised from the side wall 13 toward the inner cavity to form the pole core 11 of the linear vibration motor.
  • the casing is made of a plate of SUS-430 material.
  • the convex portion 12 is recessed from the side wall 13 of the casing in the longitudinal direction toward the inner cavity.
  • the boss 12 serves as a pole core 11 around which the coil 20 is disposed.
  • the side walls 13 along the length direction are welded to the top wall 14 and the bottom wall 15.
  • the shell wall is capable of magnetic conduction, the polarity of one end of the pole core 11 connected to the side wall 13 is conducted to the top wall 14 and the bottom wall 15 through the side wall 13, that is, the top wall 14 and the bottom wall 15 have the same shape as the pole core 11. polarity.
  • Figure 6 is a schematic diagram of a linear vibration motor in accordance with an embodiment of the present invention.
  • one end of the pole core 11 i.e., the boss portion 12 close to the permanent magnet 21 is an N pole, and one end connected to the side wall 13 is an S pole.
  • the side of the permanent magnet 21 close to the top wall 14 is an N pole, and the side close to the bottom wall 15 is an S pole.
  • the permanent magnet 21 is subjected to the Lorentz force of the coil 20 which faces the top wall 14.
  • the permanent magnet 21 receives the attraction force from the S pole of the top wall 14 according to the principle of the same-sex reciprocal attraction.
  • the S pole of the permanent magnet 21 is subjected to the repulsive force from the S pole of the bottom wall 15.
  • the three forces act in the same direction and collectively constitute a driving force to vibrate the vibrator from the initial state toward the top wall 14.
  • the vibrator is also subjected to the elastic restoring force of the elastic piece after deviating from the initial position, and the direction of the elastic restoring force is opposite to the direction of the driving force.
  • the vibrator When the vibrator vibrates up to the set position, for example, the maximum displacement.
  • the direction of the current of the coil 20 changes, and the direction of the magnetic field of the electromagnetic field changes.
  • one end of the pole core 11 close to the permanent magnet 21 is an S pole, and one end connected to the side wall 13 is an N pole.
  • the poles of the top wall 14 and the bottom wall 15 The sex becomes N pole.
  • the permanent magnet 21 is subjected to the Lorentz force of the coil 20 toward the bottom wall 15, and is simultaneously subjected to a repulsive force from the top wall 14 toward the bottom wall 15 and an attractive force from the bottom wall 15 toward the self direction.
  • the vibrator is also subjected to an elastic restoring force from the elastic piece toward the initial position.
  • the vibrator vibrates toward the bottom wall 15 by the above four driving forces. After the vibrator passes over the initial position, it is also subjected to three driving forces from the pole core 11, the top wall 14, and the bottom wall 15.
  • the vibrator When the vibrator vibrates downward to reach the set position, for example, at the maximum displacement, the direction of the magnetic field of the electromagnetic field changes again.
  • the permanent magnet 21 receives the Lorentz force from the coil 20 and the magnetic forces from the top wall 14 and the bottom wall 15 toward the top wall 14.
  • the vibrator is also subjected to an elastic restoring force from the elastic piece toward the initial position.
  • the vibrator vibrates toward the top wall 14 under the action of four forces. After the vibrator passes over the initial position, it is also subjected to three driving forces from the pole core 11, the top wall 14, and the bottom wall 15.
  • the linear vibration motor vibrates in such a reciprocating motion.
  • the vibrator In the conventional linear vibration motor, the vibrator is only subjected to the Lorentz force of the coil 20 and the permanent magnet 21 and the elastic restoring force from the elastic piece, and the driving force is small.
  • the housing since the housing can conduct a magnetic field through the pole core 11, the magnetic force of the top wall 14 and the bottom wall 15 against the permanent magnet 21 is increased.
  • the housing and the coil form an "electromagnet" to significantly increase the driving force of the vibrator. In this way, the response time of the linear vibration motor is greatly shortened.
  • the sensitivity of the vibration is improved and the seismic experience is enhanced.
  • the increase of the driving force enables the linear vibration motor to have a wider acceleration curve and can be applied to a dual-frequency or multi-frequency resonant frequency.
  • projections 12 are provided on the opposite side walls 13 and the two coils 20 are disposed around the respective projections 12.
  • the driving force of the vibrator is further increased by the arrangement of the double coil and the double permanent magnet 21.
  • Figure 7 is a schematic diagram of a linear vibration motor in accordance with another embodiment of the present invention.
  • the wall of the casing is made of a magnetically permeable material, and the pole core 11 of the linear vibration motor is connected to the side wall 13 and perpendicular to the side wall 13.
  • the coil 20 is disposed around the pole core 11.
  • the pole core 11 is separately provided and connected to the side wall 13.
  • the side wall 13 conducts the polarity of one end of the pole core 11 connected to the side wall 13 to the top wall 14 and the bottom wall 15.
  • the specially arranged pole core 11 has a better effect of gathering the magnetic field than the pole core 11 formed by the boss portion 12.
  • the magnetic field strength of the top wall 14 and the bottom wall 15 can be significantly enhanced. In this way, the driving force of the "electromagnet" is significantly enhanced.

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

Abstract

一种用于线性振动马达的壳体以及线性振动马达；该壳体包括壳壁和用于为线性振动马达的振子提供弹性回复力的弹片，壳壁围合形成内腔，壳壁具有用于连通内腔与外界的镂空区，镂空区位于振动方向上，弹片与壳壁连接，并且延伸到内腔中，弹片被配置为在被压缩时能嵌入镂空区中。这样，弹片的厚度不占用振动方向上的空间，从而为振子的振动提供了更大的空间。

Description

用于线性振动马达的壳体以及线性振动马达 技术领域
本发明涉及振动装置技术领域，更具体地，涉及一种用于线性振动马达的壳体以及线性振动马达。
背景技术
在现有的线性振动马达中，线圈与磁铁形成的洛伦兹力提供振子振动的驱动力。然而，壳体的内部空间有限，高度通常较小，振动效果较差。
此外，弹片通常位于振动方向的上、下侧，弹片的厚度还占据了壳体的内部空间，使得振子振动的空间进一步减小。
发明内容
本发明的一个目的是提供一种用于线性振动马达的壳体的新技术方案。
根据本发明的第一方面，提供了一种用于线性振动马达的壳体。该壳体包括壳壁和用于为所述线性振动马达的振子提供弹性回复力的弹片，所述壳壁围合形成内腔，所述壳壁具有用于连通内腔与外界的镂空区，所述镂空区位于振动方向上，所述弹片与所述壳壁连接，并且延伸到所述内腔中，所述弹片被配置为在被压缩时能嵌入所述镂空区中。
可选地，所述弹片与所述镂空区的边连接在一起。
可选地，所述弹片为多个。
可选地，所述壳壁包括顶壁、底壁和侧壁，三者围合在一起以形成所述内腔，所述顶壁与所述底壁平行，所述振子垂直于所述顶壁振动，所述镂空区被设置在所述顶壁和所述底壁的至少之一上。
可选地，所述镂空区为2个，其中第一镂空区位于顶壁，第二镂空区位于底壁，所述弹片为2个，其中第一弹片与第一镂空区的边连接，第二 弹片与第二镂空区的边连接，所述第一弹片与所述第二弹片的延伸方向相反。
可选地，所述镂空区由所述顶壁和/或所述底壁延伸到所述侧壁上，所述弹片与位于所述侧壁的边连接。
可选地，所述壳壁由导磁材料制作而成，由所述侧壁向所述内腔凸起以形成所述线性振动马达的极芯。
可选地，所述弹片与壳壁一体成型。
根据本发明的另一个方面，提供了一种线性振动马达。该线性振动马达马达包括本发明提供的所述壳体。
根据本发明的又一个方面，提供了一种线性振动马达。该线性振动马达马达包括本发明提供的所述壳体，所述壳壁由导磁材料制作而成，所述线性振动马达的极芯与所述侧壁连接并且垂直于所述侧壁，所述线性振动马达的线圈围绕所述极芯设置。
本发明的发明人发现，在现有技术中，弹片的厚度占据了壳体的内部空间，使得线性振动马达的振动效果差。因此，本发明所要实现的技术任务或者所要解决的技术问题是本领域技术人员从未想到的或者没有预期到的，故本发明是一种新的技术方案。
本发明实施例的壳体，壳壁具有镂空区，弹片在被压缩时能够嵌入镂空区中。这样，弹片的厚度不占用振动方向上的空间，从而为振子的振动提供了更大的空间。
此外，通过这种方式，充分利用了壳体内部的空间，能够使壳体做的更薄，顺应了电子设备轻薄化、小型化的发展趋势。
此外，提高了集成度，减少了线性振动马达的物料数量。
通过以下参照附图对本发明的示例性实施例的详细描述，本发明的其它特征及其优点将会变得清楚。
附图说明
被结合在说明书中并构成说明书的一部分的附图示出了本发明的实施例，并且连同其说明一起用于解释本发明的原理。
图1是根据本发明的一个实施例的壳体的结构示意图。
图2是根据本发明的另一个实施例的壳体的结构示意图。
图3是根据本发明的一个实施例的线性振动马达的分解图。
图4是根据本发明的一个实施例的线性振动马达的剖视图。
图5是根据本发明的一个实施例的线性振动马达的另一个角度的剖视图。
图6是根据本发明的一个实施例的线性振动马达的原理图。
图7是根据本发明的另一个实施例的线性振动马达的原理图。
附图标记说明：
11：极芯；12：凸起部；13：侧壁；14：顶壁；15：底壁；16：第一弹片；17：第二弹片；18：第一镂空区；19：第二镂空区；20：线圈；21：永磁体；22：钨钢块；23：FPCB。
具体实施方式
现在将参照附图来详细描述本发明的各种示例性实施例。应注意到：除非另外具体说明，否则在这些实施例中阐述的部件和步骤的相对布置、数字表达式和数值不限制本发明的范围。
以下对至少一个示例性实施例的描述实际上仅仅是说明性的，决不作为对本发明及其应用或使用的任何限制。
对于相关领域普通技术人员已知的技术、方法和设备可能不作详细讨论，但在适当情况下，所述技术、方法和设备应当被视为说明书的一部分。
在这里示出和讨论的所有例子中，任何具体值应被解释为仅仅是示例性的，而不是作为限制。因此，示例性实施例的其它例子可以具有不同的值。
应注意到：相似的标号和字母在下面的附图中表示类似项，因此，一旦某一项在一个附图中被定义，则在随后的附图中不需要对其进行进一步讨论。
根据本发明的实施例，提供了一种用于线性振动马达的壳体。壳体包括壳壁和用于为线性振动马达的振子提供弹性回复力的弹片。壳壁围合形 成内腔。例如，内腔用于容纳振子和定子等元件。
壳壁具有用于连通内腔与外界的镂空区，镂空区位于振动方向上。振动方向即振子振动的方向。弹片与壳壁连接，并且延伸到内腔中。弹片还包括用于与振子连接的连接端。例如，弹片与壳体的连接点位于壳壁的内侧、外侧或者其他部位。弹片能够与壳壁的任意位置连接，只要能为振子提供弹性回复力即可。优选的是，弹片与镂空区的边连接在一起。通过这种方式，能更加节省空间。
在本发明的实施例中，弹片被配置为在被压缩时能嵌入镂空区中。
本发明实施例的壳体，壳壁具有镂空区，弹片在被压缩时能够嵌入镂空区中。这样，弹片的厚度不占用振动方向上的空间，从而为振子的振动提供了更大的空间。
此外，通过这种方式，充分利用了壳体内部的空间，能够使壳体做的更薄，顺应了电子设备轻薄化、小型化的发展趋势。
此外，提高了集成度，减少了线性振动马达的物料数量。
在一个例子中，弹片为多个。例如，如图1-2所示，弹片为2个并且相对设置。振子位于两个弹片之间。通过这种方式，能够为线性振动马达提供更大的弹性回复力，有利于调节F0。当然，多个弹片也可以被设置在振子的同一侧。
优选的是，弹片与壳壁一体成型。例如，采用切割、冲压等方式在壳壁上直接开设出弹片。通过这种方式，简化了壳体的加工方法。此外，弹片与壳壁的连接更加牢固，结构强度高，耐用性良好。
图1是根据本发明的一个实施例的壳体的结构示意图。
如图1所示，在该例子中，壳壁包括顶壁14、底壁15和侧壁13，三者围合在一起以形成内腔。顶壁14与底壁15平行。振子垂直于顶壁14振动。振动方向垂直于顶壁14和底壁15。镂空区被设置在顶壁14和底壁15的至少之一上。这种结构便于加工，并且方便定子和振子的安装。可选的是，壳体的形状可以是但不局限于方形、圆形、其他多边形或者不规则形状。
例如，壳体为长方体，侧壁13为4个。沿长度方向的侧壁13用于固 定定子。例如，定子包括极芯11和围绕极芯11设置的线圈20，极芯11被固定在沿长度方向的侧壁13上。沿宽度方向的侧壁13用于设置FPCB23(柔性线路板)，FPCB用于线圈20与外部电路导通。例如，线圈20的引线与FPCB23连接，FPCB23与主控芯片连接。长度方向即长方体最长的边的延伸反向，宽度方向即垂直于振动方向并与最长的边连接的边的延伸方向。
例如，在顶壁14上设置镂空区，弹片为一个，并与镂空区的边连接。
例如，在底壁15上设置镂空区，弹片为一个，并与镂空区的边连接。
例如，如图1和5所示，在顶壁14和底壁15上均设置镂空区，即位于顶壁14的第一镂空区18和位于底壁15的第二镂空区19。弹片为2个，即第一弹片16和第二弹片17，其中，第一弹片16与第一镂空区18的边连接，第二弹片17与第二镂空区19的边连接。第一弹片16与第二弹片17的延伸方向相反。延伸方向即从弹片的用于与壳壁连接的连接点到用于与振子连接的连接端的方向。
可选的是，例如，第一弹片16和第二弹片17通过焊接的方式被设置在壳壁上。例如，第一弹片16和第二弹片17采用切割的方式，例如，等离子切割，在顶壁14和侧壁13上被分别切割出来。通过这种方式，无需另外设置弹片，简化了壳体的加工以及组装。此外，弹片与壳壁的连接更牢固，结构强度更高。
两个弹片分别位于振子的沿振动方向的上、下侧，通过这种方式能够使振子的受力更均衡，避免发生偏振。
图2是根据本发明的另一个实施例的壳体的结构示意图。
在该例子中，镂空区由顶壁14和/或底壁15延伸到侧壁13上，弹片与位于侧壁13的边连接。这种结构有效地延长了弹片的长度，能够改善弹片的应力，并且使弹片的弹性回复力更强。此外，弹片具有更高的耐弯折能力，不易发生塑性形变，弹片的使用寿命长。
此外，这种结构有利于线性振动马达的F0的调节。
例如，如图2所示，第一镂空区18延伸到沿宽度方向的一个侧壁13上，第二镂空区19延伸到沿宽度方向的另一个侧壁13上。在被压缩时， 弹片能够分别嵌入两个镂空区中。
根据本发明的另一个实施例，提供了一种线性振动马达。
图3是根据本发明的一个实施例的线性振动马达的分解图。
如图3所示，该线性振动马达包括振子、定子和本发明提供的壳体。振子包括钨钢块22和与钨钢块22连接的永磁体21。定子包括极芯11和围绕极芯11设置的线圈20。定子和振子被设置在壳体的内腔中，定子与弹片的连接端连接在一起。定子被悬置在内腔中。永磁体21与线圈20相互作用，以产生洛伦兹力。洛伦兹力驱动振子振动。
该线性振动马达具有振动效果好的特点。
在一个例子中，壳壁由导磁材料制作而成，由侧壁13向内腔凸起以形成线性振动马达的极芯11。例如，如图5所示，壳体由SUS-430材料的板材制作而成。由壳体的沿长度方向的侧壁13向内腔凹陷形成凸起部12。凸起部12作为极芯11，线圈20围绕极芯11设置。在该例子中，沿长度方向的侧壁13与顶壁14和底壁15焊接在一起。由于壳壁能够导磁，故极芯11的与侧壁13连接的一端极性通过侧壁13传导给顶壁14和底壁15，即顶壁14和底壁15具有与极芯11相同的极性。
图6是根据本发明实施例的线性振动马达的原理图。
如图6所示，在初始状态时，极芯11(即凸起部12)的靠近永磁体21的一端为N极，与侧壁13连接的一端为S极。永磁体21的靠近顶壁14的一侧为N极，靠近底壁15的一侧为S极。永磁体21受到线圈20的洛伦兹力的作用，该力朝向顶壁14。根据同性相斥异性相吸的原理，永磁体21受到了来自顶壁14的S极的吸引力。此外，永磁体21的S极受到来自底壁15的S极的排斥力。三个力的作用方向相同，共同构成驱动力，以使振子由初始状态向靠近顶壁14的方向振动。
本领域技术人员可以理解的是，在偏离初始位置后振子还会受到弹片的弹性回复力的作用，弹性回复力的方向与驱动力的方向相反。
当振子向上振动到达设定位置时，例如最大位移处。线圈20的电流方向发生变化，电磁场的磁场方向发生变化。此时，极芯11的靠近永磁体21的一端为S极，与侧壁13连接的一端为N极。顶壁14和底壁15的极 性均变为N极。永磁体21受到线圈20的朝向底壁15的洛伦兹力作用，同时受到来自顶壁14的朝向底壁15方向的排斥力以及来自底壁15的朝向自身方向的吸引力的作用。振子还受到来自弹片的朝向初始位置的弹性回复力的作用。在上述四个驱动力的作用下振子朝向底壁15方向振动。在振子越过初始位置后，还会受到来自极芯11、顶壁14和底壁15三个驱动力的作用。
当振子向下振动到达设定位置时，例如最大位移处，电磁场的磁场方向又发生变化。永磁体21受到来自线圈20的洛伦兹力以及来自顶壁14和底壁15两个朝向顶壁14的磁力的作用。振子还会受到来自弹片的朝向初始位置的弹性回复力的作用。振子在四个力的作用下朝向顶壁14振动。在振子越过初始位置后，还会受到来自极芯11、顶壁14和底壁15三个驱动力的作用。线性振动马达如此往复进行振动。
在传统的线性振动马达中，振子只受到线圈20与永磁体21的洛伦兹力作用以及来自弹片的弹性回复力的作用，驱动力较小。在本发明实施例中，由于壳体能通过极芯11传导磁场，故增加了顶壁14和底壁15对于永磁体21的磁力作用。壳体与线圈形成“电磁铁”从而使振子的驱动力显著提高。通过这种方式，使得线性振动马达的响应时间大大缩短。
此外，提高了振动的灵敏度，提升了震感体验。
此外，驱动力的增大能够使线性振动马达的加速度曲线频宽更宽，可以进行双频或多频谐振频率的应用。
优选的是，在相对的两个侧壁13上均设置有凸起部12，两个线圈20围绕各自的凸起部12设置。永磁体21为2个，并且分别与2个线圈20一一对应。通过双线圈和双永磁体21的设置，进一步增大了振子的驱动力。
图7是根据本发明的另一个实施例的线性振动马达的原理图。
如图7所示，壳壁由导磁材料制作而成，线性振动马达的极芯11与侧壁13连接并且垂直于侧壁13。线圈20围绕极芯11设置。与图6所示的实施例不同的是，在该例子中，极芯11单独设置并且与侧壁13连接。侧壁13将极芯11的与侧壁13连接的一端的极性传导至顶壁14和底壁15。专门设置的极芯11相比由凸起部12形成的极芯11，聚拢磁场的效果更好， 能够显著增强顶壁14和底壁15的磁场强度。通过这种方式，显著增强了”电磁铁”的驱动力。
虽然已经通过例子对本发明的一些特定实施例进行了详细说明，但是本领域的技术人员应该理解，以上例子仅是为了进行说明，而不是为了限制本发明的范围。本领域的技术人员应该理解，可在不脱离本发明的范围和精神的情况下，对以上实施例进行修改。本发明的范围由所附权利要求来限定。

Claims (10)

  1. 一种用于线性振动马达的壳体，其特征在于，包括壳壁和用于为所述线性振动马达的振子提供弹性回复力的弹片，所述壳壁围合形成内腔，所述壳壁具有用于连通内腔与外界的镂空区，所述镂空区位于振动方向上，所述弹片与所述壳壁连接，并且延伸到所述内腔中，所述弹片被配置为在被压缩时能嵌入所述镂空区中。
  2. 根据权利要求1所述的壳体，其特征在于，所述弹片与所述镂空区的边连接在一起。
  3. 根据权利要求1或者2所述的壳体，其特征在于，所述弹片为多个。
  4. 根据权利要求1-3中的任意一项所述的壳体，其特征在于，所述壳壁包括顶壁(14)、底壁(15)和侧壁(13)，三者围合在一起以形成所述内腔，所述顶壁(14)与所述底壁(15)平行，所述振子垂直于所述顶壁(14)振动，所述镂空区被设置在所述顶壁(14)和所述底壁(15)的至少之一上。
  5. 根据权利要求1-4中的任意一项所述的壳体，其特征在于，所述镂空区为2个，其中第一镂空区(18)位于顶壁(14)，第二镂空区(19)位于底壁(15)，所述弹片为2个，其中第一弹片(16)与第一镂空区(18)的边连接，第二弹片(17)与第二镂空区(19)的边连接，所述第一弹片(16)与所述第二弹片(17)的延伸方向相反。
  6. 根据权利要求1-5中的任意一项所述的壳体，其特征在于，所述镂空区由所述顶壁(14)和/或所述底壁(15)延伸到所述侧壁(13)上，所述弹片与位于所述侧壁(13)的边连接。
  7. 根据权利要求1-6中的任意一项述的壳体，其特征在于，所述壳壁由导磁材料制作而成，由所述侧壁(13)向所述内腔凸起以形成所述线性振动马达的极芯(11)。
  8. 根据权利要求1-7中的任意一项所述的壳体，其特征在于，所述弹片与壳壁一体成型。
  9. 一种线性振动马达，其特征在于，包括如权利要求1-8中的任意一项所述的壳体。
  10. 一种线性振动马达，其特征在于，包括如权利要求4-6中的任意一项所述的壳体，所述壳壁由导磁材料制作而成，所述线性振动马达的极芯(11)与所述侧壁(13)连接并且垂直于所述侧壁(13)，所述线性振动马达的线圈(20)围绕所述极芯(11)设置。
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