CN210016386U

CN210016386U - Linear vibration motor and mobile electronic equipment

Info

Publication number: CN210016386U
Application number: CN201920819225.8U
Authority: CN
Inventors: 黄自乐
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-05-31
Filing date: 2019-05-31
Publication date: 2020-02-04
Anticipated expiration: 2029-05-31

Abstract

The utility model discloses a linear vibration motor and mobile electronic device, include: the vibrator assembly comprises a counterweight part and at least two magnet parts embedded on the counterweight part; an outer case housing the vibrator assembly; a drive assembly including a coil fixed to the outer case, the coil driving the magnet portion in an axial direction; first gaps are formed between two opposite inner wall surfaces of the outer shell and two opposite end parts of the counterweight part along the axis direction respectively; and at least two elastic blocks, respectively disposed in the two first gaps, for reversely applying an elastic force to the vibrator assembly against the driving force applied to the magnet portion. The elastic block with the block structure is used as the elastic supporting piece of the vibrator assembly, and the elastic block is not easy to generate stress fatigue relative to the spring or the elastic sheet, so that the high-temperature resistance and the aging resistance are good, the stability of the linear vibration motor can be improved, and the service life of the linear vibration motor can be prolonged.

Description

Linear vibration motor and mobile electronic equipment

Technical Field

The utility model relates to a consumer electronics equipment technical field, concretely relates to linear vibrating motor and mobile electronic equipment.

Background

With the development of communication technology, portable electronic products, such as mobile phones, handheld game consoles or handheld multimedia entertainment devices, have come into the lives of people. In these portable electronic products, a linear vibration motor is generally used for system feedback, such as incoming call prompt of a mobile phone, vibration feedback of a game machine, and the like.

The conventional linear vibration motor generally includes an upper cover, a lower cover forming a vibration space with the upper cover, a vibrator (including a weight member and a permanent magnet) performing linear reciprocating vibration in the vibration space, an elastic support member connecting the upper cover and causing the vibrator to perform reciprocating vibration, and a coil located below the vibrator at a distance.

In the linear vibration motor of above-mentioned this kind of structure, it provides the restoring force of oscillator vibration to need elastic support piece, current elastic support piece is shell fragment or spring mostly, no matter be shell fragment or spring all have two tie points, one is connected with the oscillator, another is connected with the shell body, because the oscillator no matter is at length, width and highly all have certain size, and certain weight has, current elastic support piece's structure and with oscillator and shell body's connected mode all hardly guarantee the vibration balance of oscillator, easily produce polarization, influence linear vibration motor's performance. In addition, the spring plate and the spring are subject to stress fatigue, and after the spring plate and the spring are used for a period of time, the stress is relaxed or degenerated, so that the stability and the service life of the linear vibration motor are affected.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the defect that linear vibration motor's among the prior art life is short, poor stability to a linear vibration motor and mobile electronic equipment that long service life, stability are high are provided.

In order to solve the technical problem, the technical scheme of the utility model as follows:

a linear vibration motor comprising:

the vibrator assembly comprises a counterweight part and at least two magnet parts embedded on the counterweight part;

an outer case housing the vibrator assembly;

a drive assembly including a coil fixed to the outer case, the coil driving the magnet portion in an axial direction;

first gaps are formed between two opposite inner wall surfaces of the outer shell and two opposite end parts of the counterweight part along the axis direction respectively;

and at least two elastic blocks, respectively disposed in the two first gaps, for reversely applying an elastic force to the vibrator assembly against the driving force applied to the magnet portion.

Furthermore, the elastic block is made of special silicon rubber.

Further, the two elastic blocks are the same in size and shape.

Further, when the vibrator assembly is at an intermediate position within the outer case in the axis direction, a width of the elastic block in the axis direction is smaller than a width of the first gap in the axis direction.

Further, two opposite side walls of the elastic block in a direction perpendicular to the axis have recessed portions recessed toward an inner side of the elastic block.

Further, the center line direction of at least two of the magnet portions is the same as the axis direction.

Further, the counterweight portion has guide blocks projecting in a direction corresponding to the first gap on both end portions in the axis direction, respectively; at least two of the elastic blocks each have a guide hole corresponding to the guide block in position and guiding the reciprocating vibration of the weight portion in the axial direction.

Further, a center line direction of at least two of the magnet portions is perpendicular to the axis direction.

Further, the outer case includes an upper case and a lower case; the upper shell comprises a top plate and two first side plates which are bent downwards and extend from the end parts of two long edges of the top plate; the lower shell comprises a bottom plate and two second side plates which are bent upwards and extend from the end parts of two short edges of the bottom plate; the space between the second side plate and the weight portion is the first gap.

The utility model also provides a mobile electronic equipment, including the aforesaid linear vibration motor.

The utility model discloses technical scheme has following advantage:

1. the utility model provides a linear vibration motor, in linear motor, adopt the elastic block of massive structure to replace the mode of conventional spring or shell fragment as the elastic support piece of vibrator subassembly, because the difficult problem that stress fatigue appears of elastic block, and high temperature resistant and ageing resistance are good, can improve linear vibration motor's stability and life; moreover, the structure is simple, the assembly difficulty is reduced, and the production efficiency can be improved; in addition, because the elasticity performance of the elastic block is stronger, the volume of the corresponding occupied space is smaller, and under the condition that the whole volume of the linear vibration motor is fixed, the volume of the counterweight part of the vibrator component can be made larger, so that the noise of the resonant frequency of the linear vibration motor can be effectively reduced, the vibration balance is kept, and the low-frequency performance of the linear vibration motor is improved.

2. The utility model provides a linear vibrating motor adopts the elastic block that special silicone rubber made, and high temperature resistant aging performance is good, and is not fragile, long service life.

3. The utility model provides a linear vibration motor, the big or small shape of two elastic blocks is the same, and at the vibration in-process of vibrator subassembly, the elasticity size that two elastic blocks applyed vibrator subassembly is the same, and opposite direction enables the vibrator subassembly stability that keeps the vibration state better.

4. The utility model provides a linear vibration motor, because the elastic deformation volume of elastic block when receiving the same size pressure is less for spring or shell fragment, the width of elastic block in the axis direction is less than the width of first clearance in the axis direction, can provide bigger vibration space for the vibrator subassembly, improves linear vibration motor's the sense of shaking.

5. The utility model provides a linear vibration motor, in the direction of perpendicular to axis, the cross-sectional area of elastic block is greater than the cross-sectional area of vibrator subassembly, and this kind of elastic block can support the vibrator subassembly better in the direction of axis, undertakes the pressure of vibrator subassembly to further prevent the vibrator subassembly to take place polarization phenomenon, improve the equilibrium and the stability of vibrator subassembly vibration; on the other hand, the arrangement of the concave part which is concave inwards on the elastic block can increase the external surface area of the elastic block which is vertical to the side face in the axis direction, and after the elastic block is acted by the force of the vibrator assembly, the elastic block has larger stress release space, so that the damage phenomenon is not easy to occur, and the service life is longer.

6. The utility model provides a linear vibrating motor, at the vibration in-process of vibrator subassembly, because the guide block at counter weight portion both ends is limited in the guide hole of elastic block, makes vibrator subassembly vibrate along the axis direction, improves vibrator subassembly's equilibrium.

7. The utility model provides a mobile electronic equipment adopts foretell linear vibration motor, has that stability is good, long service life, the good advantage of sense of shaking.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic view of an overall structure of a linear vibration motor according to a first embodiment of the present invention;

fig. 2 is a schematic half-sectional view of a linear vibration motor according to a first embodiment of the present invention;

fig. 3 is an exploded view of a linear vibration motor provided in a first embodiment of the present invention;

fig. 4 is a schematic structural view of the linear vibration motor according to the first embodiment of the present invention after cutting off the top plate of the outer housing and hiding the elastic block;

fig. 5 is a schematic view of an overall structure of a linear vibration motor according to a second embodiment of the present invention, in which an upper casing is hidden to show an inner structure thereof.

Description of reference numerals: 1. an outer housing; 11. an upper housing; 111. a top plate; 112. a first side plate; 12. a lower housing; 121. a base plate; 122. a second side plate; 2. a vibrator assembly; 21. a counterweight portion; 211. a guide block; 22. a magnet portion; 3. a drive assembly; 31. a coil; 32. a circuit board; 4. a first gap; 5. an elastic block; 51. a recessed portion; 52. a guide hole; 53. and (5) yielding space.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A linear vibration motor as shown in fig. 1 to 4 includes an outer case 1 having a rectangular parallelepiped shape, and a vibrator assembly 2, a driving assembly 3, and two elastic blocks 5 accommodated in the outer case 1. The vibrator assembly 2 includes a weight portion 21 and two magnet portions 22 embedded on the weight portion 21; the driving assembly 3 comprises a coil 31 fixed on the outer shell 1 and a circuit board 32 connected with the coil 31 and extending out of the outer shell 1, wherein the coil 31 drives the magnet part 22 along an axial direction; in the present embodiment, the axial direction is defined as the longitudinal direction of the weight portion 21, that is, the vibration direction of the vibrator assembly 2. First gaps 4 are respectively formed between two opposite inner wall surfaces of the outer shell 1 and two opposite end parts of the counterweight part 21 along the axial direction; the two elastic pieces 5 are respectively disposed in the two first gaps 4, and apply an elastic force in the opposite direction to the vibrator assembly 2 against the driving force applied to the magnet portion 22, so that the vibrator assembly 2 vibrates back and forth in the axial direction by the electromagnetic force of the coil 31 and the urging force of the elastic pieces 5.

Compared with the prior art, the mode that the elastic block 5 with the block structure replaces a conventional spring or an elastic sheet to serve as the elastic supporting piece of the vibrator component 2 has the advantages of long service life and good stability due to the fact that the elastic block 5 is not easy to cause stress fatigue, and high temperature resistance and aging resistance are good, so that the stability and the service life of the linear vibration motor can be improved; moreover, the elastic block 5 has a simple structure, reduces the assembly difficulty and can improve the production efficiency; in addition, since the elastic block 5 has stronger elastic performance than a spring or a resilient plate of the same size, the volume of the corresponding elastic block 5 can be designed to be smaller, and the volume of the weight 21 of the vibrator assembly 2 can be made larger under the condition that the overall volume of the outer housing 1 of the linear vibration motor is fixed, so that the noise of the resonant frequency of the linear vibration motor can be effectively reduced, the vibration balance is maintained, and the low-frequency performance of the linear vibration motor is improved.

In a preferred embodiment of this embodiment, the elastic block 5 is made of special silicone rubber with good high temperature and aging resistance, difficult damage and long service life. Of course, the elastic block 5 can also be made of other elastic materials with good elasticity and strong fatigue resistance.

Further, the two elastic blocks 5 are the same in size and shape. Since one end of the circuit board 32 of the driving assembly 3 needs to extend out from the outer casing 1 to be connected with an external power supply device, in order to make the thickness of the whole outer casing 1 thinner, an abdicating space 53 for the circuit board 32 to extend out needs to be provided on one of the elastic blocks 5. In the present embodiment, the same size of the relief space 53 is provided on both the elastic blocks 5, so that the shapes of the two elastic blocks 5 are completely the same, and thus, during the vibration of the vibrator assembly 2, the elastic forces exerted by the two elastic blocks 5 on the vibrator assembly 2 are the same and opposite, so that the vibrator assembly 2 can better maintain the stability of the vibration state. Meanwhile, the two elastic blocks 5 are completely the same, so that the types of accessories required by motor processing are reduced, and the production cost and the assembly difficulty are reduced.

In the present embodiment, when the vibrator assembly 2 is at an intermediate position within the outer case 1 in the axial direction, the width of the elastic block 5 in the axial direction is smaller than the width of the first gap 4 in the axial direction. Because the elastic deformation amount of the elastic block 5 is smaller when the elastic block is subjected to the same pressure relative to the spring or the elastic sheet, and the width of the elastic block 5 in the axial direction is smaller than that of the first gap 4 in the axial direction, a larger vibration space can be provided for the vibrator assembly 2, and the vibration sense of the linear vibration motor is improved. Specifically, in the axial direction, the ratio of the length of the weight 21, the width of the first gap 4 and the width of the elastic block 5 is in the range of 180 to 200: 10.5-11.5: 10. the ratio of the length of the weight 21 to the width of the first gap 4 to the width of the elastic block 5 is too large, and the vibration space of the vibrator assembly 2 is small, which results in small vibration inductance of the linear motor; when the ratio of the length of the weight 21 to the width of the first gap 4 to the width of the elastic block 5 is too small, the vibrator assembly 2 is likely to be polarized during vibration, and the stability of the vibration process is not high.

In the present embodiment, the cross-sectional area of the elastic block 5 in the direction perpendicular to the axis is larger than that of the vibrator assembly 2, and the elastic block 5 has recesses 51 recessed toward the inner side of the elastic block 5 at two opposite side walls in the direction perpendicular to the axis. The elastic block 5 can better support the vibrator assembly 2 in the axial direction and bear the pressure of the vibrator assembly 2, so that the vibrator assembly 2 is further prevented from generating a polarization phenomenon, and the balance and stability of the vibration of the vibrator assembly 2 are improved; on the other hand, the external surface area of the elastic block 5 perpendicular to the axial direction side face can be increased, and after the elastic block 5 is acted by the force of the vibrator assembly 2, the elastic block 5 has a larger stress release space, so that the damage phenomenon is not easy to occur, and the service life is longer.

In the present embodiment, the outer case 1 includes an upper case 11 and a lower case 12; the upper housing 11 includes a top plate 111, and two first side plates 112 bent and extended downward from the end portions of two long sides of the top plate 111; the lower case 12 includes a bottom plate 121, and two second side plates 122 bent and extended upward from the ends of two short sides of the bottom plate 121; the space between the second side plate 122 and the weight 21 is the first gap 4.

In the first embodiment of the present embodiment, there are two magnet portions 22 on the vibrator assembly 2, and the magnet portions are symmetrically embedded in the weight portion 21, and the center line direction of the two magnet portions 22 is the same as the axial direction. When the coil 31 is energized, electromagnetic force is applied to the two magnet portions 22, and the weight portion 21 is vibrated in the lateral direction by the magnet portions 22 and the two elastic pieces 5.

Further, the weight portion 21 has guide blocks 211 protruding in the direction corresponding to the first gap 4 at both ends in the axial direction, respectively; each of the two elastic blocks 5 has a guide hole 52 corresponding to the position of the guide block 211 and guiding the reciprocating vibration of the weight 21 in the axial direction. Due to the guiding function of the guide holes 52 on the guide blocks 211 at the two ends of the weight part 21, the vibrator assembly 2 can vibrate better along the axial direction, and the balance of the vibrator assembly 2 is improved; moreover, this way does not require additional guide shafts on both sides of the weight 21, simplifying the structure of the linear motor and making the assembly operation simpler; the problem that the width of the linear vibration motor is increased due to the arrangement of the guide shaft is avoided, and the thinning and the compaction on the thickness can be realized; in addition, the influence on the assembly efficiency caused by the fact that the two guide shafts need to be ensured to be parallel in the process of assembling the two guide shafts is overcome.

In the second embodiment of the present embodiment, as shown in fig. 5, the difference from the first embodiment is that the center line direction of the two magnet portions 22 is perpendicular to the axial direction. When the coil 31 is energized, electromagnetic force is applied to the two magnet portions 22, and the weight portion 21 is longitudinally reciprocated and vibrated by the magnet portions 22 and the two elastic pieces 5.

To sum up, the embodiment of the present invention provides a linear vibration motor, which uses the elastic block 5 made of block-shaped special silicone rubber block to replace the conventional spring or elastic piece as the elastic supporting member of the vibrator assembly 2, because the elastic block 5 is not easy to cause stress fatigue, and has good high temperature resistance and aging resistance, the stability and the service life of the linear vibration motor can be improved; moreover, the structure is simple, the assembly difficulty is reduced, and the production efficiency can be improved; in addition, because the elastic performance of the elastic block 5 is stronger, the volume of the corresponding occupied space is smaller, and under the condition that the whole volume of the linear vibration motor is fixed, the volume of the counterweight part 21 of the vibrator assembly 2 can be made larger, so that the noise of the resonant frequency of the linear vibration motor can be effectively reduced, the vibration balance is kept, and the low-frequency performance of the linear vibration motor is improved.

The utility model also provides a mobile electronic equipment, including foretell linear vibration motor. The linear vibration motor has the advantages of good stability, long service life and good vibration sense.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims

1. A linear vibration motor, comprising:

a vibrator assembly (2) including a weight portion (21) and at least two magnet portions (22) embedded on the weight portion (21);

an outer case (1) that houses the vibrator assembly (2);

a drive assembly (3) comprising a coil (31) fixed to the outer housing (1), the coil (31) driving the magnet portion (22) along an axial direction;

first gaps (4) are respectively formed between two opposite inner wall surfaces of the outer shell (1) and two opposite end parts of the counterweight part (21) along the axial direction;

and at least two elastic pieces (5) which are respectively arranged in the two first gaps (4) and which apply an elastic force in the opposite direction to the vibrator assembly (2) against the driving force applied to the magnet portion (22).

2. Linear vibration motor according to claim 1, characterized in that the elastic block (5) is made of special silicone rubber.

3. The linear vibration motor according to claim 1, wherein the two elastic pieces (5) are identical in size and shape.

4. The linear vibration motor according to claim 1, wherein a width of the elastic block (5) in the axial direction is smaller than a width of the first gap (4) in the axial direction when the vibrator assembly (2) is at an intermediate position within the outer case (1) in the axial direction.

5. The linear vibration motor according to claim 1, wherein two opposite side walls of the elastic block (5) in a direction perpendicular to the axis have a recess (51) recessed toward an inner side of the elastic block (5).

6. The linear vibration motor according to claim 1, wherein a center line direction of at least two of the magnet portions (22) is the same as the axis direction.

7. The linear vibration motor according to claim 6, wherein the weight portion (21) has guide blocks (211) projecting in the direction corresponding to the first gap (4) on both end portions in the axis direction, respectively; at least two of the elastic blocks (5) each have a guide hole (52) corresponding to the position of the guide block (211) and guiding the reciprocating vibration of the weight portion (21) in the axial direction.

8. The linear vibration motor according to claim 1, wherein a centerline direction of at least two of said magnet portions (22) is perpendicular to said axial direction.

9. The linear vibration motor according to claim 1, wherein the outer case (1) comprises an upper case (11) and a lower case (12); the upper shell (11) comprises a top plate (111) and two first side plates (112) which are bent downwards and extend from the end parts of two long sides of the top plate (111); the lower shell (12) comprises a bottom plate (121) and two second side plates (122) which are bent upwards and extend from the end parts of two short sides of the bottom plate (121); the space between the second side plate (122) and the weight portion (21) is the first gap (4).

10. A mobile electronic device, characterized in that it comprises a linear vibration motor according to any of claims 1-9.