WO2022062149A1

WO2022062149A1 - Linear vibration motor

Info

Publication number: WO2022062149A1
Application number: PCT/CN2020/130731
Authority: WO
Inventors: 毛路斌; 李子昂; 崔志勇; 汤赟
Original assignee: 瑞声声学科技(深圳)有限公司; 瑞声科技(新加坡)有限公司
Priority date: 2020-09-28
Filing date: 2020-11-23
Publication date: 2022-03-31
Also published as: CN213461504U

Abstract

A linear vibration motor, comprising a housing (100), a vibrator structure (200), and a stator structure (300). The vibrator structure (200) is movably provided in a mounting cavity defined by the housing (100), and the vibrator structure (200) comprises a pair of first magnetic steels (210) that are oppositely arranged and spaced apart from each other and a pair of second magnetic steels (220) that are oppositely arranged and spaced apart from each other; each first magnetic steel (210) comprises a first section (213) and second sections (214) extending from two ends of the first section (213), a mounting position (212) is formed between the two opposite second sections (214), and the second magnetic steel (220) is located at the mounting position (212); the pair of the first magnetic steels (210) and the pair of the second magnetic steels (220) enclose a surrounding region (230), and the polarity of the first magnetic steels (210) facing the surrounding region (230) is different from the polarity of the second magnetic steels (220) facing the surrounding region (230). The linear vibration motor has a strong vibration sensation; moreover, the existing space of the vibrator structure can be fully used, and under the condition of a certain space, the purpose of improving the vibration sensation is achieved.

Description

A linear vibration motor

technical field

The present application relates to the technical field of motors, and in particular, to a linear vibration motor.

Background technique

A linear vibration motor is generally composed of a vibrator structure and a stator structure. The vibrator structure is generally formed by arranging magnetic steel, so that the vibrator structure will form a magnetic field. The stator structure is placed in the magnetic field. An electromagnetic force is formed between the structure and the stator structure, and the electromagnetic force can drive the vibrator structure to perform linear reciprocating motion, thereby realizing the function of a linear vibration motor.

technical problem

The linear vibration motor in the prior art generally does not leave much space for arranging the vibrator structure due to the limitation of its size and structure. The space of the vibrator structure is also becoming more and more compact, and the layout and planning of the vibrator structure becomes more and more difficult, resulting in a limited magnetic induction intensity that the vibrator structure can generate, which leads to the vibration amount of the linear vibration motor (linear reciprocating motion). Stroke) is limited, the vibration effect of linear vibration motor, especially small linear vibration motor is not good.

Therefore, it is necessary to provide a linear vibration motor with a stronger vibration sense.

technical solutions

The purpose of the present application is to provide a linear vibration motor with a stronger vibration sense.

According to an embodiment of the present application, the linear vibration motor includes:

a housing defining a mounting cavity;

A vibrator structure, the vibrator structure is movably arranged in the installation cavity, and the vibrator structure includes a pair of first magnetic steels arranged opposite and spaced apart, and a pair of second magnetic steels arranged opposite and spaced apart, the first magnetic steels The magnetic steel includes a first section and a second section extending from both ends of the first section, an installation position is formed between the two opposite second sections, and the second magnetic steel is located in the installation position , a pair of the first magnetic steel and a pair of the second magnetic steel are enclosed to form a surrounding area, the polarity of the first magnetic steel facing the surrounding area and the polarity of the second magnetic steel the polarities facing the surrounding area are different;

and a stator structure, the stator structure is fixedly arranged in the wrapping area, and the stator structure includes an iron core, a coil arranged on the iron core, and A first magnetic induction member and a second magnetic induction member, the first magnetic induction member and one of the pair of first magnetic steels are disposed opposite to each other, and the second magnetic induction member and the other of the pair of first magnetic steels In contrast, after the coil is energized, the first magnetic induction member and the second magnetic induction member have different polarities.

In some embodiments of the linear vibration motor, the first segment and the second segment are both rectangular in structure and the first segment is perpendicular to the second segment, and the second magnetic steel is in a rectangular structure , the surrounding area is a rectangular area, and the stator structure is located at the center of the rectangular area.

In some embodiments of the linear vibration motor, the vibrator structure further includes a magnetic conductive sheet arranged around the first magnetic steel and the second magnetic steel and used for magnetic shielding.

In some embodiments of the linear vibration motor, a glue groove for accommodating glue is provided between the first magnetic steel and the magnetic conductive sheet, and/or between the second magnetic steel and the A glue groove for accommodating the glue is arranged between the magnetic conductive sheets.

In some embodiments of the linear vibration motor, the vibrator structure further includes a weight block having an accommodating cavity, and the magnetic conductive sheet abuts against a cavity wall of the accommodating cavity.

In some embodiments of the linear vibration motor, the linear vibration motor further includes an elastic support assembly, the elastic support assembly is connected between the counterweight and the housing, for supporting the vibrator structure to the Provide elastic restoring force and move the vibrator structure in a preset direction.

In some embodiments of the linear vibration motor, the elastic support assembly includes an elastic sheet and a welding sheet disposed at both ends of the elastic sheet, the elastic sheet is from one side of the counterweight block to the opposite side of the counterweight block. side extension.

In some embodiments of the linear vibration motor, the elastic piece includes a first connecting section, a second connecting section, and an extending section connected between the first connecting section and the second connecting section, the extending section A segment extends from the first connection segment toward the second connection segment in a direction inclined to the outer wall of the counterweight.

In some embodiments of the linear vibration motor, an interval area is formed between the elastic sheet and the outer wall of the counterweight, and the elastic support assembly further includes a foam disposed in the interval area.

In some embodiments of the linear vibration motor, the linear vibration motor further includes a limiter, and the limiter is provided at both ends of the stroke path of the vibrator structure, and is used to perform the vibration of the vibrator structure. limit.

In some embodiments of the linear vibration motor, the housing includes a lower cover and an upper cover disposed on the lower cover, the upper cover and the lower cover enclose the installation cavity, and the installation cavity is formed by the upper cover and the lower cover. A flexible circuit board is disposed on the lower cover, and the flexible circuit board is electrically connected to the stator structure.

beneficial effect

The beneficial effect of the present application is that after the stator structure in the embodiment of the present application is energized, the first magnetic induction member and the second magnetic induction member can induce different polarities, and the first magnetic induction member and the second magnetic induction member are in In the surrounding area formed by the vibrator structure, the first magnetic induction member and the second magnetic induction member can generate electromagnetic force with the first magnetic steel in the vibrator structure, so as to push the vibrator structure to move in the direction of the electromagnetic force, thereby forming vibration , at the same time for the vibrator structure, since the polarity of the first magnetic steel facing the surrounding area is different from the polarity of the second magnetic steel facing the surrounding area, and by using the second magnetic steel to fit into the first magnetic steel The layout between the magnets can not only form multiple magnetic field loops in the surrounding area, but also make the coils in the stator structure act on the magnetic field loop to generate ampere force, which can form equal-sized ampere force on the vibrator structure. Reaction force, the reaction force can push the vibrator structure to move together with the aforementioned electromagnetic force, so that the vibrator structure has a stronger vibration sense, and it can also make the vibrator structure make full use of the existing space, under certain conditions of space, to achieve The purpose of improving the vibration sense is especially beneficial to the miniaturization development trend of linear vibration motors.

Description of drawings

1 is a schematic structural diagram of a linear vibration motor in an embodiment of the application;

2 is a schematic diagram of an explosion structure of a linear vibration motor in an embodiment of the application;

FIG. 3 is a schematic structural diagram of a linear vibration motor with a top cover removed in an embodiment of the application;

4 is an assembly schematic diagram of a vibrator structure and a stator structure of a linear vibration motor in an embodiment of the application;

5 is a schematic diagram of a magnetic field circuit of a linear vibration motor according to an embodiment of the application;

Fig. 6 is the polarity relation diagram of the first magnetic steel of the linear vibration motor in one embodiment of the application;

7 is a diagram showing the force relationship of the linear vibration motor in the first direction of the coil of the linear vibration motor according to an embodiment of the application;

FIG. 8 is a force relationship diagram of the linear vibration motor in the second direction of the coil of the linear vibration motor according to an embodiment of the application;

FIG. 9 is a schematic structural diagram of a magnetic conductive sheet of a linear vibration motor according to an embodiment of the present application.

Description of main component symbols:

100-shell; 200-vibrator structure; 300-stator structure; 400-elastic support assembly; 500-limiting piece; 110-lower cover; 120-upper cover; 130-flexible circuit board; 210-first magnetic steel; 220-Second magnet; 230-Wrap area; 240-Magnetic sheet; 250-Counterweight; 310-Core; 320-Coil; 330-First magnetic induction part; 340-Second magnetic induction part; Shrapnel; 420-soldering piece; 430-foam; 212-installation position; 213-first segment; 214-second segment; 241-glue groove; 251-accommodating cavity; 411-first connecting segment; 412-second connecting segment; 413-extension segment; 414-notch.

Embodiments of the present invention

The present application will be further described below with reference to the accompanying drawings and embodiments.

Embodiments of the present application provide a linear vibration motor, which can be applied to various electronic devices, and can make the electronic device vibrate to remind a user to check messages or perform other related operations.

In the embodiment of the present application, please refer to FIGS. 1-4 , the linear vibration motor (hereinafter referred to as “vibration motor”) includes a housing 100 , a vibrator structure 200 and a stator structure 300 .

The housing 100 defines an installation cavity, and the vibrator structure 200 and the stator structure 300 are installed in the installation cavity. The housing 100, as an external component of the vibration motor, can provide certain protection for the vibrator structure 200 and the stator structure 300. .

The vibrator structure 200 is movably arranged in the installation cavity, and the vibrator structure 200 includes a pair of first magnetic steels 210 arranged opposite and spaced apart and a pair of second magnetic steels 220 arranged oppositely and spaced apart. A section 213 and a second section 214 extending from both ends of the first section 213, an installation position 212 is formed between the two opposite second sections 214, the second magnet 220 is located in the installation position 212, a pair of first The magnetic steel 210 and a pair of second magnetic steels 210 enclose a surrounding area 230, and the polarity of the first magnetic steel 210 facing the surrounding area 230 is the same as the polarity of the second magnetic steel 220 facing the surrounding area 230. different.

It should be noted here that the installation position 212 is formed by the space between two opposite first magnetic steels 210 , that is, the second segment 214 on one first magnetic steel 210 and the second first magnetic steel 210 on the other first magnetic steel 210 The installation position 212 is formed between the second sections 214 of the two second sections 214, and the two second sections 214 are arranged opposite to each other.

The stator structure 300 is fixedly disposed in the surrounding area 230 , and the stator structure 300 includes an iron core 310 , a coil 320 disposed on the iron core 310 , and a first magnetic induction member 330 and The second magnetic induction member 340, the first magnetic induction member 330 and one of the pair of first magnetic steels 210 are disposed opposite to each other, and the second magnetic induction member 340 is disposed opposite to the other of the pair of first magnetic steels 210, after the coil 320 is energized , the first magnetic induction element 330 and the second magnetic induction element 340 generate different polarities.

In the embodiment of the present application, after the coil 320 of the stator structure 300 is energized, the first magnetic induction part 330 and the second magnetic induction part 340 can induce different polarities, and the first magnetic induction part 330 and the second magnetic induction part 340 are in In the surrounding area 230 formed by the vibrator structure 200, the first magnetic induction member 330 and the second magnetic induction member 340 can generate electromagnetic force with the first magnetic steel 210 in the vibrator structure 200, thereby pushing the vibrator structure 200 along the electromagnetic force moving in the direction of , thereby forming vibration, and for the vibrator structure 200, since the polarity of the first magnetic steel 210 facing the surrounding area 230 and the polarity of the second magnetic steel 220 facing the surrounding area 230 are different, and By adopting the layout in which the second magnetic steel 220 is fitted between the first magnetic steels 210 , not only can a plurality of magnetic field loops be formed in the surrounding area 230 , so that the coils 320 in the stator structure 300 are located in the magnetic field loop. The action will generate an ampere force, which can form an equal reaction force on the vibrator structure 200, and the reaction force and the aforementioned electromagnetic force can jointly push the vibrator structure 200 to move, so that the vibrator structure 200 has a stronger vibration sense, and It is also possible to make the vibrator structure 200 make full use of the existing space, and achieve the purpose of improving the vibration sense under certain conditions of the space, which is especially beneficial to the miniaturization development trend of the linear vibration motor.

In an embodiment, please refer to FIG. 4 , the coil 320 is arranged in a direction parallel to the central axis of the wrapping region 230 . At this time, it can be known that when a current flows through the coil 320 , the current direction can be consistent with the direction of the current in the magnetic field loop. The direction of the magnetic field lines is parallel. According to the left-hand rule, it is not difficult to know that the ampere force received by the coil 320 may coincide with the direction of the electromagnetic force, and the reaction force of the ampere force can cooperate with the electromagnetic force to make the vibrator structure 200 vibration is more intense.

It should be noted here that the specific structures of the first segment 213 and the second segment 214 are not limited. For example, the first segment 213 and the second segment 214 may be straight segments or arc segments. When 213 is a straight line segment, the second segment 214 can be a straight line segment or an arc line segment, and when the first segment 213 is an arc line segment, the second segment 214 can be a straight line segment or an arc line segment part. Of course, in addition to the straight line segment and the arc line segment, the first segment 213 and the second segment 214 may also have various other structures, such as a wave shape and the like.

In addition, it should be noted that the aforementioned first paragraph 213 and second paragraph 214 only refer to the first magnetic steel 210 having these structural parts, but do not mean that the first magnetic steel 210 must be a split structure, in other words, the first magnetic steel 210 may be A whole piece of magnetic steel can also be formed by splicing multiple pieces of magnetic steel.

In some more specific embodiments, the first segment 213 and the second segment 214 are both rectangular structures, and the first segment 213 is perpendicular to the second segment 214. In this case, the first segment 213 and the second segment 214 both use the aforementioned straight line segment, the second magnetic steel 220 is a rectangular structure, the surrounding area 230 is a rectangular area, and the stator structure 300 is at the center of the rectangular area 230 .

Therefore, for the vibrator structure 200 and the stator structure 300 , they form a symmetrical structure, so that a constant magnetic field can be formed in the surrounding area 230 . In order to facilitate the description and understanding of the magnetic field, the following description will be made with reference to FIGS. 4-8.

First, please refer to FIG. 4 , the vibrator structure 200 and the stator structure 300 form a cubic structure. It may be illustrated by taking a traditional space rectangular coordinate system as an example. The X direction is the opposite direction of the first magnetic steel 210 , that is, the first magnetic steel 210 is along the The X direction is arranged, the Y direction is the opposite direction of the second magnetic steel 220 , that is, the second magnetic steel 220 is arranged in the Y reverse direction, and the Z direction is the winding direction of the coil 320 . On the basis of the aforementioned definitions, it is not difficult to understand that the first magnetic steel 210 and the second magnetic steel 220 are both arranged in the XY plane and extend toward the Z direction to a certain thickness, and the axial direction of the iron core 310 coincides with the X direction , the first magnetic induction part 330 and the second magnetic induction part 340 are arranged along the X direction.

5-6, the polarity of the first magnetic steel 210 facing the surrounding area 230 is the N pole, and the polarity of the second magnetic steel 220 facing the surrounding area 230 is the S pole. The surrounding area 230 will present four sub-areas, and each sub-area occupies a quarter of the space of the surrounding area 230. Take sub-area A and sub-area B as an example. At this time, it can be seen that from the first magnetic steel 210 The magnetic field lines emitted by the first segment 213 of the 213 will point to each other, but since the second magnetic steel 220 with the polarity of S pole is arranged between the two opposite second segments 214, the above-mentioned magnetic field lines are affected by the second magnetic steel 220. The traction of the magnetic steel 220 will enter the second magnetic steel 220 , thereby forming a magnetic field circuit U in the area A, and the magnetic field lines of the magnetic field circuit U are directed from the first section 213 of the first magnetic steel 210 At the same time, the second magnetic steel 220 forms a magnetic field circuit V in the region B, and the magnetic field lines of the magnetic field circuit V point from the first segment 213 of another first magnetic steel 210 to the same second magnetic steel 220 .

Next, please refer to FIG. 5 and FIGS. 7-8 . Since the coil 320 is wound on the iron core 310 in the reverse Z direction, for ease of understanding, the coil 320 may be divided into two parts, one of which is located in the sub-region A and the sub-region In B, the other part is located in sub-region C and sub-region D. Taking the first current direction in FIG. 7 as an example, for the first part of the coil 320, the current flowing through the coil 320 is from the outside to the inside. (Based on the orientation shown in FIG. 7 ), while the magnetic field line E passing through the partial coil 320 is from bottom to top (based on the orientation shown in FIG. 7 ), at this time, according to the left-hand rule, the ampere force received by the partial coil 320 is directed to Right (based on the orientation shown in FIG. 7 ), for the latter part of the coil 320 , the current flowing through the coil 320 is from the inside to the outside (based on the orientation shown in FIG. 7 ), while passing through the magnetic field lines of this part of the coil 320 E goes from top to bottom (based on the orientation shown in FIG. 7 ). At this time, according to the left-hand rule, the ampere force received by this part of the coil 320 is also to the right (based on the orientation shown in FIG. 7 ), so that the entire coil 320 is subjected to a right ampere force. At the same time, after the coil 320 is energized, the N pole and the S pole are induced on the first magnetic induction member 330 and the second magnetic induction member 340 respectively, so that the first magnetic steel 210 and the first magnetic induction member 330 and the second magnetic induction member A rightward electromagnetic force will be formed between 340, which is in the same direction as the aforementioned ampere force, and the two combine to form F1, so according to the principle of reaction force, the aforementioned electromagnetic force and ampere force will combine to form a driving oscillator structure 200 Driving force F2 for right-to-left movement (based on the orientation shown in Figure 7). Taking the second current direction in FIG. 8 as an example, for the first part of the coil 320, the current flowing from the coil 320 is from the inside to the outside (based on the orientation shown in FIG. 8 ), and passes through this part of the coil at the same time. The magnetic field line E of 320 is from bottom to top (based on the orientation shown in FIG. 8 ). At this time, according to the left-hand rule, the ampere force received by this part of the coil 320 is to the left (based on the orientation shown in FIG. 8 ). For the latter part of the coil 320 In other words, the current flowing through the coil 320 is from the top to the bottom (based on the orientation shown in FIG. 7 ), while the magnetic field line E passing through the part of the coil 320 is from top to bottom (based on the orientation shown in FIG. 8 ). According to the left-hand rule, the ampere force received by this part of the coil 320 is also leftward (based on the orientation shown in FIG. 8 ), so that the whole coil 320 is subjected to a leftward ampere force. The S pole and the N pole are induced on the second magnetic induction member 340 respectively, so that a leftward electromagnetic force is formed between the first magnetic steel 210 and the first magnetic induction member 330 and the second magnetic induction member 340. The electromagnetic force The direction of the above-mentioned ampere force is the same, and the two combine to form F1, so according to the principle of reaction force, the above-mentioned electromagnetic force and ampere force will form a driving force F2 that drives the vibrator structure 200 to move from left to right (based on the orientation shown in FIG. 7 ). ).

In FIG. 7 and FIG. 8 , the directions of the currents passing through the coil 320 are opposite, so that the final movement direction of the vibrator structure 200 is also opposite. The force of left and right vibration will be generated, so as to realize the vibration function of the vibration motor.

The principle that the sub-region C and the sub-region D form a magnetic field loop, and the force of the coil 320 in the magnetic field loop can be understood with reference to the foregoing description, and will not be repeated here.

It should be pointed out that the above only takes a typical vibrator structure 200 and stator structure 300 as an example to illustrate the force relationship between the magnetic field and the coil 320, but it should be understood that when the vibrator structure 200 and the stator structure 300 use other structures, such as vibrator When the first magnetic steel 210 of the structure 200 adopts the arc-shaped segment mentioned above, the relationship between the magnetic field and the force should be correctly understood.

In one embodiment, please refer to FIGS. 2-4 , the vibrator structure 200 further includes a magnetic conductive sheet 240 disposed around the first magnetic steel 210 and the second magnetic steel 220 for magnetic shielding.

Specifically, the magnetic conductive sheet 240 is made of SPCD material, and the arrangement of the magnetic conductive sheet 240 can make the magnetic field circuit in the surrounding area 230 more stable.

Combining with the aforementioned embodiments including the first magnet 210 having the first segment 213 and the second segment 214, and the first segment 213 and the second segment 214 are both straight segments, and the second magnet 220 having straight segments, The magnetic conductive sheets 240 are also correspondingly arranged in two groups, wherein one group of magnetic conductive sheets 240 is arranged on the outer wall of the first magnetic steel 210 , and the other group of magnetic conductive sheets 240 is arranged on the outer wall of the second magnetic steel 220 .

In some specific embodiments, the magnetic conductive sheet 240 is connected with the first magnetic steel 210 and the second magnetic steel 220 by means of glue.

Further, in some more specific embodiments, please refer to FIG. 9 , a glue groove 241 for accommodating glue is provided between the first magnetic steel 210 and the magnetic conductive sheet 240 , and/or the second magnetic steel 220 A glue groove 241 for accommodating glue is arranged between the magnetic conductive sheet 240. The glue groove 241 can prevent the glue from overflowing and can improve the connection between the magnetic conductive sheet 240 and the first magnetic steel 210 and the second magnetic steel 220. reliability.

In one embodiment, please refer to FIGS. 2-3 , the vibrator structure 200 further includes a weight block 250 having a accommodating cavity 251 , and the magnetic conductive sheet 240 abuts against the cavity wall of the accommodating cavity 251 .

The counterweight block 250 protects the first magnetic steel 210 , the second magnetic steel 220 , the magnetic conductive sheet 240 and the like placed inside it on the one hand, and can also increase the overall weight of the vibrator structure 200 , so that the vibrator structure 200 Has a more intense vibration.

It can be understood that the specific structure of the counterweight block 250 can be designed according to actual requirements, for example, as mentioned above, it includes a first segment 213 and a second segment 214 and both the first segment 213 and the second segment 214 are straight segments. In the embodiment of the first magnetic steel 210 and the second magnetic steel 220 having a straight line segment, the counterweight 250 can be designed to be approximately a rectangular parallelepiped structure, and the accommodating cavity 251 thereof is also a rectangular parallelepiped.

Further, in an embodiment, please refer to FIGS. 2-3 , the linear vibration motor further includes an elastic support assembly 400 , and the elastic support assembly 400 is connected between the counterweight 250 and the housing 100 , and is used for supporting the vibrator structure 200 provides elastic restoring force and moves the vibrator structure 200 in a predetermined direction.

7-8 and the foregoing description, when the vibrator structure 200 moves from left to right or from right to left, the elastic support element 400 can accumulate elastic restoring force, so that the vibrator structure 200 can move in the opposite direction more easily. In addition, during the movement of the vibrator structure 200 , the elastic support component 400 can also produce a traction effect on the vibrator structure 200 , so as to prevent the vibrator structure 200 from swinging.

In a specific embodiment, please continue to refer to FIGS. 2-3 , the elastic support assembly 400 includes a spring piece 410 and solder pieces 420 disposed at both ends of the spring piece 410 . opposite side extension.

The elastic piece 410 is connected between the counterweight 250 and the housing 100 through the soldering piece 420 . The soldering piece 420 is disposed between the elastic piece 410 and the housing 100 , and the aforementioned functions of the elastic support assembly 400 can be realized by the elastic action of the elastic piece 410 .

Specifically, the elastic piece 410 includes a first connecting section 411, a second connecting section 412, and an extending section 413 connected between the first connecting section 411 and the second connecting section 412, and the two soldering pieces 420 are respectively disposed on the first connecting section 411 and the second connecting section 412. on the connecting segment 411 and the second connecting segment 412 .

In some more specific embodiments, the first connecting section 411 , the second connecting section 412 and the extending section 413 all adopt a sheet-like structure, so that the elastic piece 410 has better elastic effect.

Further, in a further specific embodiment, the extending section 413 extends from the first connecting section 411 to the second connecting section 412 in a direction inclined to the outer wall of the counterweight block 250 , so that the balance between the counterweight block 250 and the elastic piece 410 is formed. The distance between them increases, and the extension section 413 has a larger elastic deformation space, so that the elastic effect of the elastic sheet 410 is further enhanced.

In a specific embodiment, an interval area is formed between the elastic sheet 410 and the outer wall of the weight block 250, and the elastic support assembly 400 further includes a foam 430 disposed in the interval area, and the foam 430 can protect and The function of mechanical damping is increased, so that the vibration of the vibrator structure 200 can be performed smoothly and stably.

In an embodiment, please refer to FIGS. 2-3 , the linear vibration motor further includes a limiter 500 , the limiter 500 is disposed at both ends of the stroke path of the vibrator structure 200 for limiting the vibrator structure 200 bit.

The limiting member 500 can prevent the vibrator structure 200 from exceeding a predetermined stroke, so as to protect the vibrator structure 200 .

The limiting member 500 can be designed as a block or other structures, and can be fixedly installed on the travel path of the vibrator structure 200 during assembly.

In some specific embodiments, the limiting member 500 can be in contact with the counterweight 250 to achieve its limiting function. Therefore, in order to prevent the aforementioned elastic sheet 410 from interfering with the limiting member 500 , the elastic sheet 410 is further formed with a gap 414 , which can allow the limiting member 500 to pass through, thereby facilitating the limiting member 500 to contact the counterweight 250 .

In one embodiment, the housing 100 includes a lower cover 110 and an upper cover 120 disposed on the lower cover 110, the upper cover 120 and the lower cover 110 enclose an installation cavity, and the lower cover 110 is provided with a flexible circuit board 130, The flexible circuit board 130 is electrically connected to the stator structure 200 .

In combination with the above-mentioned embodiments, the stator structure 200 can be fixedly mounted on the lower cover 110 by welding. Specifically, it can be realized by welding the iron core 310 , the first magnetic induction member 330 and the second magnetic induction member 340 to the lower cover 110 . ; The limiting member 500 can also be fixedly connected to the lower cover 110 by welding.

Of course, in addition to the foregoing methods, the stator structure 200 and the limiting member 500 may also be fixedly connected to the upper cover 120 by welding.

The above are only the embodiments of the present application. It should be pointed out that for those of ordinary skill in the art, improvements can be made without departing from the creative concept of the present application, but these belong to the present application. scope of protection.

Claims

A linear vibration motor, characterized in that it includes:

a housing defining a mounting cavity;

A vibrator structure, the vibrator structure is movably arranged in the installation cavity, and the vibrator structure includes a pair of first magnetic steels arranged opposite and spaced apart, and a pair of second magnetic steels arranged opposite and spaced apart, the first magnetic steels The magnetic steel includes a first section and a second section extending from both ends of the first section, an installation position is formed between the two opposite second sections, and the second magnetic steel is located in the installation position , a pair of the first magnetic steel and a pair of the second magnetic steel are enclosed to form a surrounding area, the polarity of the first magnetic steel facing the surrounding area and the polarity of the second magnetic steel the polarities facing the surrounding area are different;

and a stator structure, the stator structure is fixedly arranged in the wrapping area, and the stator structure includes an iron core, a coil arranged on the iron core, and A first magnetic induction member and a second magnetic induction member, the first magnetic induction member and one of the pair of first magnetic steels are disposed opposite to each other, and the second magnetic induction member and the other of the pair of first magnetic steels In contrast, after the coil is energized, the first magnetic induction member and the second magnetic induction member have different polarities.
The linear vibration motor according to claim 1, wherein the first segment and the second segment are both rectangular structures, the first segment is perpendicular to the second segment, and the second magnetic steel It is a rectangular structure, the surrounding area is a rectangular area, and the stator structure is at the center of the rectangular area.
The linear vibration motor according to claim 1, wherein the vibrator structure further comprises a magnetic conductive sheet disposed around the first magnetic steel and the second magnetic steel.
The linear vibration motor according to claim 3, wherein a glue groove for accommodating glue is provided between the first magnetic steel and the magnetic conductive sheet, and/or a glue groove is arranged between the second magnetic steel and the second magnetic steel. A glue groove for accommodating glue is arranged between the magnetic conducting sheet and the magnetic conducting sheet.
The linear vibration motor according to claim 3, wherein the vibrator structure further comprises a weight block having an accommodating cavity, and the magnetic conductive sheet abuts against a cavity wall of the accommodating cavity.
The linear vibration motor according to claim 5, characterized in that, the linear vibration motor further comprises an elastic support component, and the elastic support component is connected between the counterweight and the housing, and is used for providing the The vibrator structure provides elastic restoring force and moves the vibrator structure in a predetermined direction.
The linear vibration motor according to claim 6, wherein the elastic support component comprises an elastic sheet and a welding sheet disposed at both ends of the elastic sheet, the elastic sheet is directed toward the counterweight from one side of the counterweight block The opposite side of the block extends.
The linear vibration motor according to claim 7, wherein the elastic piece comprises a first connecting section, a second connecting section and an extension section connected between the first connecting section and the second connecting section, The extending section extends from the first connecting section to the second connecting section in a direction inclined to the outer wall of the counterweight.
The linear vibration motor according to claim 7, wherein a spaced area is formed between the elastic piece and the outer wall of the counterweight, and the elastic support assembly further comprises a foam cotton disposed in the spaced area .
The linear vibration motor according to claim 1, characterized in that, the linear vibration motor further comprises a limiter, and the limiter is arranged on both ends of the stroke path of the vibrator structure, and is used for the The vibrator structure is limited.
The linear vibration motor according to any one of claims 1-10, wherein the housing comprises a lower cover and an upper cover which is covered on the lower cover, the upper cover and the lower cover The mounting cavity is formed by enclosing, a flexible circuit board is arranged on the lower cover, and the flexible circuit board is electrically connected to the stator structure.