CN108322007B

CN108322007B - Linear vibration motor

Info

Publication number: CN108322007B
Application number: CN201810102021.2A
Authority: CN
Inventors: 黄兴志; 董乐平; 浦晓峰; 凌芳华
Original assignee: AAC Technologies Pte Ltd
Current assignee: AAC Technologies Pte Ltd
Priority date: 2018-02-01
Filing date: 2018-02-01
Publication date: 2020-07-14
Anticipated expiration: 2038-02-01
Also published as: CN108322007A

Abstract

The invention provides a linear vibration motor which comprises a shell with an accommodating space, a coil fixed on the shell, a vibration unit opposite to the coil and arranged at intervals, and an elastic piece for supporting the vibration unit and suspending the vibration unit in the accommodating space, wherein the elastic piece comprises at least two planar springs which are overlapped with each other and a blocking piece clamped between two adjacent planar springs, and the blocking piece enables a gap to be formed between the two adjacent planar springs. Compared with the related art, the linear vibration motor has the advantages of good structural reliability and long service life.

Description

Linear vibration motor

[ technical field ] A method for producing a semiconductor device

The invention relates to the technical field of motors, in particular to a linear vibration motor applied to portable electronic products.

[ background of the invention ]

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. In such a wide application, the performance of the linear vibration motor is more and more required.

The linear vibration motor of the related art includes a housing having an accommodating space, a vibration unit accommodated in the accommodating space, an elastic member that supports and suspends the vibration unit in the accommodating space, and a coil fixed to the housing.

However, the elastic member of the related art is of a single-layer structure, and since the elastic member of the single-layer structure has a high stress level, in a practical application process, the linear vibration motor is prone to failure or even damage in the case of strong vibration such as dropping, so that the reliability of the linear vibration motor is reduced and the service life of the linear vibration motor is shortened.

Therefore, there is a need to provide a new linear vibration motor to solve the above technical problems.

[ summary of the invention ]

The invention aims to provide a linear vibration motor with good vibration performance and strong reliability.

In order to achieve the above object, the present invention provides a linear vibration motor, including a housing having an accommodation space, a coil fixed to the housing, a vibration unit opposite to the coil and disposed at an interval, and an elastic member supporting the vibration unit and suspending the vibration unit in the accommodation space, where the elastic member includes at least two planar springs stacked on each other and a blocking piece sandwiched between two adjacent planar springs, and the blocking piece enables a gap to be formed between the two adjacent planar springs.

Preferably, the elastic element includes a fixing portion fixed to the housing, a connecting portion fixed to the vibration unit, and an elastic arm connected between the fixing portion and the connecting portion and suspended in the air, and the blocking piece is disposed on the fixing portion and the connecting portion.

Preferably, the elastic component is of an annular structure, the two fixing parts are oppositely arranged, the two connecting parts are oppositely arranged, and the two fixing parts and the two connecting parts are arranged at staggered intervals and annularly arranged on the vibration unit.

Preferably, the fixing portion, the connecting portion, and the elastic arm are located on the same plane.

Preferably, the vibration unit includes a magnetic yoke, a main magnetic steel fixed to the magnetic yoke, and two auxiliary magnetic steels respectively located at two opposite sides of the main magnetic steel, and the two connecting portions are respectively fixed to the two auxiliary magnetic steels.

Preferably, the linear vibration motor is of a rectangular structure, the two auxiliary magnetic steels are respectively located on two opposite sides of the linear vibration motor in the long axis direction, and the two fixing portions are respectively located on two opposite sides of the linear vibration motor in the short axis direction.

Preferably, the auxiliary magnetic steel and the main magnetic steel are arranged at intervals to form a magnetic gap, one end of the coil is fixed to the shell, and the other end of the coil is inserted and suspended in the magnetic gap.

Preferably, the housing includes an upper cover, a lower cover, and a sidewall formed by bending and extending the lower cover to the upper cover, and the coil and the fixing portion of the elastic member are both fixed to the upper cover.

Preferably, the linear vibration motor further includes a connection block, and the fixing portion is fixedly connected to the upper cover through the connection block.

Preferably, one side of the side wall, which is close to the upper cover, is recessed in the direction close to the lower cover to form a groove, the grooves comprise two grooves which are oppositely arranged, and the two connecting blocks are respectively clamped in the two grooves.

Compared with the prior art, the elastic piece of the linear vibration motor is of a double-layer structure, the adjacent planar springs are connected through the baffle, and a gap is formed between the two layers of planar springs at the elastic arm to form a double-layer planar elastic piece structure, so that the stress of the elastic piece is reduced, and the linear vibration motor can still keep a good use effect under the conditions of slight falling and the like; meanwhile, the elastic part with the double-layer structure is more reliable in structure, and can prevent the linear vibration motor from being damaged in the falling process, so that the service life of the linear vibration motor can be prolonged.

[ description of the drawings ]

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

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

fig. 2 is an exploded view of a partial perspective structure of the linear vibration motor of the present invention;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 1;

fig. 4 is a schematic structural view of an elastic member of the linear vibration motor of the present invention;

fig. 5 is an exploded perspective view of an elastic member of the linear vibration motor according to the present invention.

[ detailed description ] embodiments

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 and fig. 2, fig. 1 is a schematic perspective view of a linear vibration motor according to the present invention; fig. 2 is an exploded view of a partial perspective structure of the linear vibration motor of the present invention. The invention provides a linear vibration motor 100, which comprises a shell 1 with an accommodating space 10, a vibration unit 2 accommodated in the accommodating space 10, a coil 3 arranged corresponding to the vibration unit 2, and an elastic piece 4 for supporting and suspending the vibration unit 2 in the accommodating space 10.

The housing 1 includes an upper cover 11, a lower cover 12, and a side wall 13 formed by extending the lower cover 12 to the upper cover 11, the lower cover 12, and the side wall 13 together surround the accommodating space 10, the coil 3 is accommodated in the accommodating space 10 and fixed to the upper cover 11, and of course, the coil 3 may also be fixed to the lower cover 12.

In the present embodiment, the coil 3 is fixed to the upper cover 11.

Please refer to fig. 3, which is a cross-sectional view taken along the line a-a in fig. 1. The vibration unit 2 comprises a magnetic yoke 21, a main magnetic steel 22 fixed on the magnetic yoke 21, and two auxiliary magnetic steels 23 respectively positioned at two opposite sides of the main magnetic steel 22.

Specifically, the linear vibration motor 100 has a rectangular structure, and the two auxiliary magnetic steels 23 are respectively located at two opposite sides of the linear vibration motor 100 along the long axis direction.

The auxiliary magnetic steel 23 and the main magnetic steel 22 are arranged at an interval to form a magnetic gap 24, one end of the coil 3 is fixed to the upper cover 11, and the other end of the coil 3 is inserted and suspended in the magnetic gap 24, that is, one side of the coil 3, which is far away from the upper cover 11, is suspended in the magnetic gap 24.

The elastic member 4 surrounds the coil 3 and is fixed to the vibration unit 2, and the elastic member 4 supports the vibration unit 2 and suspends it in the housing space 10. In specific application, the coil 3 and the vibration unit 2 can be arranged in a non-opposite mode, and only the stress balance of the vibration unit 2 is required to be kept. The vibration unit 2 is driven to vibrate by the coil 3.

Fig. 4 is a schematic structural diagram of an elastic element of a linear vibration motor according to the present invention. In this embodiment, the elastic member 4 has a symmetrical planar structure, and the elastic member 4 has a rectangular annular structure. It includes a fixing portion 41 fixed to the housing 1, a connecting portion 42 fixed to the vibration unit 2, and an elastic arm 43 connected between the fixing portion 41 and the connecting portion 42.

Specifically, the elastic member 4 includes two that are located its relative two short sides respectively fixed part 41 with be located two of its two long sides respectively connecting portion 42, the elastic arm 43 is connected in two fixed part 41 and two between the connecting portion 42 and form the loop, make two fixed part 41 and two connecting portion 42 are crisscross and the interval sets up, fixed part 41 connecting portion 42 and elastic arm 43 are located the coplanar.

The two connecting portions 42 are respectively fixed to the two auxiliary magnetic steels 23, and the two fixing portions 41 are respectively located on two opposite sides of the linear vibration motor 100 along the short axis direction and are fixed to the upper cover 11.

Of course, the elastic element 4 may also be in a shape of a long strip, a circular ring, a U, or other shapes, and functions to support the vibration unit 2 and suspend it in the accommodating space 10 to realize vibration.

Fixed part 41 is fixed in casing 1 upper cover 11 is concrete, be equipped with recess 131 on the lateral wall 13, the keeping away from of fixed part 41 the one end card of vibration unit 2 is located in the recess 131 to locate through folding connecting block 132 on the fixed part 41 is fixed to upper cover 11 makes elastic component 4 with form fixed connection between the casing 1, this kind of structure is convenient for assemble, connecting block 132 has thickness, for elastic component 4's activity provides the space. Of course, in a specific application, the fixing portion 41 may be fixed to the housing 1 by other connection methods such as gluing, snapping, welding, and the like.

Fig. 5 is a perspective exploded view of the elastic member of the linear vibration motor according to the present invention. The elastic member 4 includes at least two layers of planar springs 411, and a blocking plate 412 is sandwiched between two adjacent layers of the planar springs 411. The blocking plate 412 enables a gap to be reserved between two adjacent layers of the planar spring 411. In this embodiment, the elastic member 4 includes two layers of the planar spring 411, so as to form a dual-layer planar elastic member structure. Of course, the elastic member 4 may further include two or more layers of the planar spring 411.

In the present invention, the "flat spring" is not limited to a structure in which the respective portions are located on the same plane, that is, a structure in which the fixing portion 41 and the connecting portion 42 are parallel or coplanar.

When the fixing portion 41 and the connecting portion 42 are coplanar, the elastic arm 43 connects the fixing wall 41 and the connecting portion 42 on the same plane, so as to form a planar spring structure integrally located on a plane; when the fixing portion 41 and the connecting portion 42 are parallel, that is, not coplanar, the elastic wall 43 is designed to have a bending structure, for example, the two ends connecting the fixing portion 41 and the connecting portion 42 are bent in opposite directions to achieve connection, that is, the fixing portion 41 and the connecting portion 42 are located on two parallel planes and are integrally in a planar spring structure.

Specifically, the blocking piece 412 is disposed at a position of the elastic element 4 corresponding to the fixing portion 41 and the connecting portion 42. The blocking plate 412 is disposed to have a gap between two layers of the planar spring 411 at the position of the elastic arm 413 of the elastic member 4.

The structure of the elastic member 4 is more reliable by providing two layers of the plane spring 411, and the life of the linear vibration motor 100 can be prolonged.

The stress of the elastic member 4 can be reduced by providing two layers of the planar springs 411 and erecting the baffle plate 412 between the two layers of the planar springs 411, so that the linear vibration motor 100 can also exert normal effects in environments with strong vibration, such as slight falling.

Compared with the prior art, the elastic piece of the linear vibration motor is of a double-layer structure, the adjacent planar springs are connected through the baffle plate, and a gap is formed between the two layers of planar springs at the elastic arm to form a double-layer planar elastic piece structure, so that the stress of the elastic piece is reduced, and the linear vibration motor can still keep a good use effect under the conditions of slight falling and the like; meanwhile, the elastic part with the double-layer structure is more reliable in structure, and can prevent the linear vibration motor from being damaged in the falling process, so that the service life of the linear vibration motor can be prolonged.

While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a linear vibration motor, including the casing that has accommodating space, be fixed in the coil of casing, with the relative just interval setting's of coil vibration unit and incite somebody to action vibration unit supports and suspends in accommodating space's elastic component, its characterized in that, the elastic component includes that at least two are folded the plane spring of establishing each other and press from both sides and locate adjacent two separation blades between the plane spring, the separation blade makes adjacent two form the clearance between the plane spring, the elastic component is including being fixed in the fixed part of casing, being fixed in vibration unit's connecting portion and connect in the fixed part with between the connecting portion and the unsettled elastic arm that sets up, the separation blade set up in the fixed part with connecting portion, the fixed part connecting portion and the elastic arm is located the coplanar.

2. The linear vibration motor of claim 1, wherein the elastic member has a ring structure, the two fixing portions are oppositely disposed, the two connecting portions are oppositely disposed, and the two fixing portions and the two connecting portions are alternately disposed and annularly disposed on the vibration unit.

3. The linear vibration motor of claim 2, wherein said vibration unit includes a yoke, a main magnetic steel fixed to said yoke, and two sub magnetic steels respectively located at opposite sides of said main magnetic steel, and two of said connecting portions are respectively fixed to two of said sub magnetic steels.

4. The linear vibration motor of claim 3, wherein the linear vibration motor has a rectangular structure, two of the secondary magnetic steels are respectively located at two opposite sides of the linear vibration motor along a major axis direction, and two of the fixing portions are respectively located at two opposite sides of the linear vibration motor along a minor axis direction.

5. The linear vibration motor of claim 3, wherein the secondary magnetic steel and the primary magnetic steel are spaced apart from each other to form a magnetic gap, one end of the coil is fixed to the housing, and the other end of the coil is inserted into and suspended in the magnetic gap.

6. The linear vibration motor of claim 5, wherein the housing includes an upper cover, a lower cover, and a sidewall formed by bending and extending the lower cover toward the upper cover, and the coil and the fixing portion of the elastic member are fixed to the upper cover.

7. The linear vibration motor of claim 6, further comprising a connection block through which the fixing part is fixedly connected to the upper cover.

8. The linear vibration motor of claim 7, wherein a side of the side wall close to the upper cover is recessed toward a side close to the lower cover to form two grooves, the two grooves are opposite to each other, and the two connecting blocks are respectively engaged with the two grooves.