Linear vibration motor

Abstract

Provided in the present invention is a linear vibration motor, comprising a housing provided with an accommodating space, a vibration unit elastically supported in the housing, a driving unit fixed in the housing and driving the vibration unit to vibrate, and a flexible circuit board fixed in the housing and electrically connected to the driving unit. The driving unit and the vibration unit are spaced apart from each other and are arranged opposite to each other; the vibration unit comprises a steel magnet assembly; the driving unit comprises a coil fixed to both the housing and the flexible circuit board by means of an adhesive; the coil is electrically connected to the flexible circuit board by means of an extended coil lead wire; an insulating layer is further attached to the housing; the insulating layer is interposed between the coil lead wire and the housing. In the linear vibration motor in the present invention, the coil lead wire can be insulated from the housing by means of the adhesive and the insulating layer, thereby solving the problem of poor insulation between a coil and a housing caused by direct contact between a coil lead wire and a cover plate.

Description

Linear vibration motor Technical Field

[0001] This invention relates to the field of motor technology, and more particularly to a linear vibration motor. Background Technology

[0002] A linear vibration motor is a machine that converts other forms of energy into mechanical motion. It is mainly used in devices that require mechanical motion, such as mobile phones, game consoles, and tablets with vibration functions.

[0003] The linear vibration motor mainly includes a housing, a vibration unit elastically supported within the housing, a drive unit fixed within the housing and driving the vibration unit to vibrate, and a flexible circuit board fixed within the housing and electrically connected to the drive unit.

[0004] The vibration unit of a linear vibration motor mainly uses magnets, and the drive unit mainly uses coils. In order to achieve electrical connection with the flexible circuit board, the extended coil leads need to be connected to the flexible circuit board.

[0005] In related technologies, the coil leads are directly connected to the flexible circuit board, with a gap between them and the housing. Although this design can avoid direct contact between the coil leads and the housing to some extent, which could lead to poor insulation (poor conductivity) between the coil and the housing, the coil leads will still move to some extent when the linear vibration motor is running. This can cause the coil leads to come into direct contact with the housing, resulting in poor insulation between the coil and the housing.

[0006] Therefore, it is necessary to provide a new linear vibration motor to solve the above-mentioned technical problems. Technical issues

[0007] The purpose of this invention is to provide a new linear vibration motor to solve the problem in related linear vibration motors where the coil leads easily come into direct contact with the housing, resulting in poor insulation between the coil and the housing. Technical solutions

[0008] This invention provides a linear vibration motor, comprising a housing with a receiving space, a vibration unit elastically supported within the housing, a drive unit fixed within the housing and driving the vibration unit to vibrate, and a flexible circuit board fixed within the housing and electrically connected to the drive unit. The drive unit and the vibration unit are spaced apart from each other and arranged opposite each other. The vibration unit includes a magnet assembly. The drive unit includes a coil that is simultaneously fixed to the housing and the flexible circuit board by adhesive. The coil is electrically connected to the flexible circuit board through an extended coil lead. The housing is also covered with an insulating layer, which is sandwiched between the coil lead and the housing.

[0009] Preferably, the coil is ring-shaped; the flexible circuit board is fixed to the housing by adhesive flowing from the coil leads, the flexible circuit board includes a main body portion spaced apart from the coil and extending outside the housing, an annular portion fixed between the coil and the housing, and a connecting portion connecting the main body portion and the annular portion; the coil is attached to the annular portion and at least partially glued to the housing.

[0010] Preferably, the flexible circuit board has a through hole that extends through the connecting portion and / or the annular portion.

[0011] Preferably, the insulating layer is polyimide or double-sided adhesive.

[0012] Preferably, the vibration unit further includes a mass block elastically supported within the housing; the magnet assembly includes a first magnet group and a second magnet group, the first magnet group and the second magnet group being fixed to the side of the mass block closer to the coil and the side of the mass block farther from the coil, respectively.

[0013] Preferably, the first magnet group includes three first magnets fixed to the side of the mass block near the coil, and the three first magnets are arranged at intervals along the vibration direction of the vibration unit; the second magnet group includes three second magnets fixed to the side of the mass block away from the coil, and the three second magnets are arranged at intervals along the vibration direction of the vibration unit, with the three second magnets and the three first magnets respectively facing each other.

[0014] Preferably, the mass block has a first recessed groove on the side closer to the coil, and a second recessed groove on the side farther from the coil; the first magnet assembly is fixed in the first groove, and the second magnet assembly is fixed in the second groove.

[0015] Preferably, the first groove has a first protrusion extending in the middle region, and the first magnet in the middle is fixed to the first protrusion; the second groove has a second protrusion extending in the middle region, and the second magnet in the middle is fixed to the second protrusion.

[0016] Preferably, the drive unit further includes an iron core fixed inside the housing, and the coil is wound around the iron core and spaced apart from the housing.

[0017] Preferably, the housing is rectangular; the linear vibration motor further includes two elastic elements, and the opposite sides of the vibration unit are elastically supported on opposite sides of the housing by the elastic elements. Beneficial effects

[0018] Compared with related technologies, the linear vibration motor of this invention fixes the coil lead of the coil extension to the housing and flexible circuit board with glue, and attaches an insulating layer to the housing. In this way, the coil lead and the housing are insulated by the glue and the insulating layer, thereby solving the problem of poor insulation between the coil and the housing caused by direct contact between the coil lead and the cover plate. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0020] Figure 1 is a three-dimensional structural diagram of the linear vibration motor provided in an embodiment of the present invention;

[0021] Figure 2 is an exploded view of the overall structure of the linear vibration motor provided in an embodiment of the present invention;

[0022] Figure 3 is a first-view view of the flexible circuit board and coil of the linear vibration motor provided in an embodiment of the present invention;

[0023] Figure 4 is a second-view view of the flexible circuit board and coil of the linear vibration motor provided in an embodiment of the present invention;

[0024] Figure 5 is a cross-sectional view along line AA in Figure 1.

[0025] Among them, 100 is a linear vibration motor; 1 is a housing; 11 is a base plate; 12 is a side plate; 13 is a cover plate; 2 is a vibration unit; 21 is a first magnet group; 211 is a first magnet; 22 is a second magnet group; 221 is a second magnet; 23 is a mass block; 231 is a first groove; 2311 is a first protrusion; 232 is a second groove; 2321 is a second protrusion; 3 is a drive unit; 31 is a coil; 311 is a coil lead; 32 is an iron core; 4 is a flexible circuit board; 41 is a main body; 42 is an annular part; 43 is a connecting part; 44 is a through hole; 5 is an elastic element; and 6 is a gasket. Embodiments of the present invention

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] The present invention provides a linear vibration motor 100, as shown in Figures 1 to 5. It includes a housing 1 with a receiving space, a vibration unit 2 elastically supported in the housing 1, a drive unit 3 fixed in the housing 1 and driving the vibration unit 2 to vibrate, and a flexible circuit board 4 fixed in the housing 1 and electrically connected to the drive unit 3. The drive unit 3 and the vibration unit 2 are spaced apart from each other and arranged opposite each other.

[0028] The housing 1 is rectangular; the housing 1 includes a bottom plate 11, a side plate 12 formed by bending and extending the periphery of the bottom plate 11, and a cover plate 13 covering the side plate 12. The bottom plate 11, the side plate 12, and the cover plate 13 together form a receiving space; the vibration unit 2 is elastically supported on the side plate 12, and the drive unit 3 and the flexible circuit board 4 are respectively fixed to the cover plate 13.

[0029] The vibration unit 2 includes a mass block 23 elastically supported in the housing 1 and a magnet assembly fixed to the mass block 23; the magnet assembly includes a first magnet group 21 and a second magnet group 22, the first magnet group 21 and the second magnet group 22 being fixed to the side of the mass block 23 near the coil 31 and the side of the mass block 23 away from the coil 31, respectively.

[0030] The mass block 23 has an inwardly recessed first groove 231 on the side near the coil 31, and an inwardly recessed second groove 232 on the side away from the coil 31; the first magnet assembly 21 is fixed in the first groove 231, and the second magnet assembly 22 is fixed in the second groove 232.

[0031] The first magnet group 21 includes three first magnets 211 fixed to the side of the mass block 23 near the coil 31. The three first magnets 211 are arranged at intervals along the vibration direction of the vibration unit 2. The second magnet group 22 includes three second magnets 221 fixed to the side of the mass block 23 away from the coil 31. The three second magnets 221 are arranged at intervals along the vibration direction of the vibration unit 2. The three second magnets 221 and the three first magnets 211 are respectively positioned opposite each other.

[0032] The first groove 231 has a first protrusion 2311 extending in the middle region, and a first magnet 211 in the middle is fixed to the first protrusion 2311; the second groove 232 has a second protrusion 2321 extending in the middle region, and a second magnet 221 in the middle is fixed to the second protrusion 2321.

[0033] The housing 1 is rectangular; the linear vibration motor 100 also includes two elastic elements 5, and the opposite sides of the vibration unit 2 are elastically supported on opposite sides of the housing 1 by the elastic elements 5. Specifically, the elastic elements 5 are fixed to the side wall of the housing 1; the elastic elements 5 are V-shaped springs, but according to actual needs, they can also be U-shaped springs, springs, elastic silicone or elastic rubber, etc.

[0034] The drive unit 3 includes a coil 31 that is fixed to the housing 1 and the flexible circuit board 4 by adhesive. The coil 31 is electrically connected to the flexible circuit board 4 by an extended coil lead 311. The housing 1 is also covered with an insulating layer, which is sandwiched between the coil lead 311 and the housing 1.

[0035] The drive unit 3 also includes an iron core 32 fixed inside the housing 1, and a coil 31 wound around the iron core 32 and spaced apart from the housing 1. Specifically, the iron core 32 is fixed to the cover plate 13 of the housing 1.

[0036] The coil 31 is ring-shaped. The flexible circuit board 4 is fixed to the housing 1 by adhesive flowing from the coil lead 311. The flexible circuit board 4 includes a main body 41 spaced apart from the coil 31 and extending outside the housing 1, an annular portion 42 fixed between the coil 31 and the housing 1, and a connecting portion 43 connecting the main body 41 and the annular portion 42. The coil 31 is attached to the annular portion 42 and at least partially glued to the housing 1. The coil lead 311 is fixed to the connecting portion 43 and the main body 41, respectively. This means that the portion of the coil 31 near the flexible circuit board 4 and exposed on the flexible circuit board 4 is fixed to the housing 1. Since the flexible circuit board 4 is fixed to the housing 1 by adhesive flowing from the coil lead 311, and the coil lead 311 is fixed to the flexible circuit board 4 by adhesive through the connecting portion 43 and the main body 41, it is also shown that the coil lead 311 is fixed to the housing 1 by adhesive. This design increases the contact area between the coil 31 and the housing 1, thereby improving the bonding strength between the coil 31 and the housing 1.

[0037] Specifically, the flexible circuit board 4 is fixed to the cover plate 13 of the housing 1.

[0038] The flexible circuit board 4 has a through hole 44 that passes through it, and the through hole 44 passes through the connecting part 43 and / or the annular part 42. This design ensures that the glue on the coil lead 311 flows between the flexible circuit board 4 and the cover plate 13, thereby increasing the contact area between the flexible circuit board 4 and the housing 1, and thus improving the bonding strength between the coil 31 and the housing 1.

[0039] The insulating layer is made of polyimide or double-sided adhesive.

[0040] The linear vibration motor 100 also includes a pad 6 fixed to the base plate 11 on the side near the mass block 23 and positioned directly opposite the mass block 23.

[0041] Compared with related technologies, the linear vibration motor 100 in this embodiment fixes the coil lead 311 of the coil 31 to the housing 1 and the flexible circuit board 4 with glue, and attaches an insulating layer to the housing 1. In this way, the coil lead 311 can be insulated from the housing 1 by the glue and the insulating layer, thereby solving the problem of poor insulation between the coil 31 and the housing 1 caused by direct contact between the coil lead 311 and the cover plate 13.

[0042] The above description is merely an embodiment of the present invention. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements all fall within the protection scope of the present invention.

Claims

1. A linear vibration motor, comprising a housing having a receiving space, a vibration unit elastically supported within the housing, a drive unit fixed within the housing and driving the vibration unit to vibrate, and a flexible circuit board fixed within the housing and electrically connected to the drive unit, wherein the drive unit and the vibration unit are spaced apart from each other and arranged opposite to each other; the vibration unit includes a magnet assembly, characterized in that, The drive unit includes a coil that is simultaneously fixed to the housing and the flexible circuit board by adhesive. The coil is electrically connected to the flexible circuit board through extended coil leads. The housing is also covered with an insulating layer that is sandwiched between the coil leads and the housing.

2. The linear vibration motor as described in claim 1, characterized in that, The coil is ring-shaped; the flexible circuit board includes a main body portion spaced apart from the coil and extending outside the housing, an annular portion fixed between the coil and the housing, and a connecting portion connecting the main body portion and the annular portion; the coil is attached to the annular portion and at least partially glued to the housing.

3. The linear vibration motor as described in claim 2, characterized in that, The flexible circuit board has a through hole that passes through it, and the through hole passes through the connecting portion and / or the annular portion.

4. The linear vibration motor as described in claim 1, characterized in that, The insulating layer is polyimide or double-sided adhesive.

5. The linear vibration motor as described in claim 1, characterized in that, The vibration unit further includes a mass block elastically supported within the housing; the magnet assembly includes a first magnet group and a second magnet group, the first magnet group and the second magnet group being fixed to the side of the mass block closer to the coil and the side of the mass block farther from the coil, respectively.

6. The linear vibration motor as described in claim 5, characterized in that, The first magnet group includes three first magnets fixed to the side of the mass block near the coil, and the three first magnets are arranged at intervals along the vibration direction of the vibration unit; the second magnet group includes three second magnets fixed to the side of the mass block away from the coil, and the three second magnets are arranged at intervals along the vibration direction of the vibration unit, with the three second magnets and the three first magnets respectively facing each other.

7. The linear vibration motor as described in claim 6, characterized in that, The mass block has a first recessed groove on the side closer to the coil, and a second recessed groove on the side farther away from the coil; the first magnet assembly is fixed in the first groove, and the second magnet assembly is fixed in the second groove.

8. The linear vibration motor as described in claim 7, characterized in that, The first groove has a first protrusion extending in the middle region, and the first magnet in the middle is fixed to the first protrusion; the second groove has a second protrusion extending in the middle region, and the second magnet in the middle is fixed to the second protrusion.

9. The linear vibration motor as described in claim 8, characterized in that, The drive unit also includes an iron core fixed inside the housing, and the coil is wound around the iron core and spaced apart from the housing.

10. The linear vibration motor as described in claim 1, characterized in that, The housing is rectangular; the linear vibration motor also includes two elastic elements, and the opposite sides of the vibration unit are elastically supported on opposite sides of the housing by the elastic elements.

Images