Linear vibration motor

Abstract

The utility model relates to a linear vibration motor, including the shell with the accommodation space, vibrator subassembly, stator subassembly and V type elastic part, vibrator subassembly both ends are fixedly connected shell in through elastic part, stator subassembly and vibrator subassembly are set apart in the accommodation space, vibrator subassembly includes the cuboid mass block with the mounting hole of the through thickness direction and the magnet assembly of accommodation in the mounting hole, stator subassembly includes the flexible circuit board and annular coil, the width of mounting hole is greater than the width of coil, and the coil is erected in the mounting hole and is surrounded in magnet assembly, and the magnet assembly includes the support plate of magnetism, the pair of magnetic steel of same polarity and magnetic pole opposite with support plate fixed integral and the yoke between magnetic steel, the utility model discloses the magnetic induction line of motor magnetic pole almost all passes through the coil, greatly improves the magnetic field utilization rate, and enhances vibration.

Description

Technical Field

[0001] This utility model relates to the field of vibration motor technology and discloses a linear vibration motor. Background Technology

[0002] Miniature vibration motors are commonly found in smart electronic devices such as mobile phones, tablets, and game controllers. They are used to provide vibration feedback to consumers to alert them, such as when a mobile phone receives a call or when a game vibrates.

[0003] Existing linear vibration motors include a housing with a accommodating space, a mover, a stator, and a spring assembly housed within the housing. One end of the spring assembly is connected to the housing, and the other end is connected to a mass block. The mover includes a magnet and a mass block for fixing the magnet. The stator includes a coil and a circuit board. The mover is positioned vertically and horizontally within the accommodating space above and below the stator. A drawback of this vibration motor structure is that most of the magnetic field lines of the magnet do not pass through the coil, resulting in low magnetic field utilization.

[0004] Therefore, it is necessary to provide a new type of linear vibration motor. Utility Model Content

[0005] The purpose of this invention is to provide a novel linear vibration motor with a simple structure, aiming to solve the problem of low magnetic field utilization in existing linear vibration motors. The specific technical solution is as follows:

[0006] A linear vibration motor includes a housing with a accommodating space, an oscillator assembly, a stator assembly, and a V-shaped elastic element. The oscillator assembly is fixedly connected at both ends to the housing via the elastic element. The stator assembly and the oscillator assembly are spaced apart within the accommodating space. The oscillator assembly includes a cuboid mass block with a central mounting hole extending through its thickness direction and a magnet assembly housed within the mounting hole. The stator assembly includes a flexible circuit board and a ring coil. The width of the mounting hole is greater than the width of the coil. The coil stands upright within the mounting hole and is spaced around the magnet assembly. The magnet assembly includes a support plate, a pair of magnets with the same polarity and opposite magnetic poles fixed integrally with the support plate, and a yoke placed between the magnets.

[0007] Preferably, the oscillator assembly further includes a damping element; the mass block includes a relief groove on one side of the stator assembly that adapts to the flexible circuit board, a limiting blind groove recessed on both sides of the mounting hole parallel to its short side, and grooves symmetrically arranged on its short side outer wall for adapting to the damping element; limiting platforms are formed on both sides of the limiting blind groove; the distance between the limiting blind grooves is greater than the width of the mounting hole, and the distance between the limiting platforms is less than the length of the mounting hole; one end of the elastic element is diagonally symmetrically welded and fixed to the short side outer wall of the mass block; the damping element is located between the mass block and the elastic element.

[0008] Preferably, the mounting hole and the limiting blind groove are connected.

[0009] Preferably, the thickness of the magnet assembly is less than the depth of the limiting blind groove, and the length and width of the magnet assembly are adapted to the length and width of the limiting blind groove.

[0010] Preferably, the magnet and the yoke are fixed on the same side of the support plate, the horizontal projected area of ​​the magnet and the yoke is the same, and the vertical projected area of ​​the magnet and the yoke is the same as the area of ​​the support plate.

[0011] Preferably, the outer shell includes an upper plate, a lower plate, and a middle frame located between the upper plate and the lower plate, and the other end of the elastic element is welded and fixed to the inner wall of the middle frame.

[0012] Preferably, the coil is a roughly rectangular ring that wraps around the adjacent ends of two magnets. One long side of the coil is bonded to the flexible circuit board, and the other long side abuts against the inner surface of the upper plate.

[0013] Preferably, the middle frame is diagonally symmetrically divided into two parts.

[0014] Preferably, the flexible circuit board includes an internal power terminal and an external power terminal; the coil is bonded and fixed and erected on the internal power terminal, and the external power terminal extends from the middle frame into the accommodating space.

[0015] Preferably, the lower plate is integrally provided with an extension adapted to the external power terminal.

[0016] The beneficial effects of this utility model are as follows: (1) The linear vibration motor has a simple structure and is easy to assemble; (2) The setting of the limit blind slot and the support plate provides a stable magnet assembly structure for the oscillator assembly, ensuring that the oscillator assembly remains stable during reciprocating vibration, thereby ensuring the stability and reliability of the motor and thus improving the vibration performance; (3) The support plate is made of magnetic conductive material, which effectively forms part of the magnetic circuit in the linear vibration motor, can guide and concentrate the magnetic field, and ensure that the magnetic field can effectively act on the coil of the stator assembly and the magnet assembly of the oscillator assembly, thereby improving the working efficiency and performance of the motor; (4) The magnetization direction of the two magnets is consistent with the vibration direction of the oscillator assembly, and the polarity of the adjacent ends of the magnets is the same and the magnetic poles are opposite. The coil is wrapped around the adjacent ends of the magnets, so that the magnetic field lines coming out of the motor magnetic poles can almost all pass through the coil. Therefore, the magnetic field utilization rate of the linear vibration motor is greatly improved. Attached Figure Description

[0017] Figure 1 This is a 3D view of the assembly of a linear vibration motor.

[0018] Figure 2 This is an exploded view of the structure of a linear vibration motor.

[0019] Figure 3 This is an exploded view of the oscillator assembly.

[0020] Figure 4 It is a three-dimensional diagram of the assembly of the oscillator assembly, coil, and elastic element.

[0021] Figure 5 It is along Figure 1 Cross-sectional view of line AA in the middle.

[0022] in:

[0023] 1-Outer shell; 10-Upper plate; 11-Middle frame; 12-Lower plate; 120-Extension; 2-Oscillator assembly; 20-Mass block; 200-Mounting hole; 201-Limiting blind groove; 202-Limiting platform; 203-Leaning groove; 204-Groove; 21-Magnet; 22-Yoke; 23-Support plate; 24-Damping component; 31-Coil; 30-Flexible circuit board; 4-Elastic component. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] This utility model relates to a linear vibration motor, such as... Figures 1 to 5 As shown, the linear vibration motor is rectangular in shape and includes a housing 1 with an accommodating space (not shown), an oscillator assembly 2, a stator assembly, and a V-shaped elastic element 4. The two ends of the oscillator assembly 2 are fixedly connected to the housing 1 through the elastic element 4. The oscillator assembly 2 and the stator assembly (not shown) are spaced apart within the accommodating space. The housing 1 includes an upper plate 10, a lower plate 12, and a middle frame 11 located between the upper plate 10 and the lower plate 12. The middle frame 11 is diagonally symmetrically separated. One end of the elastic element 4 is diagonally symmetrically welded and fixed to the oscillator assembly 2, and the other end is welded and fixed to the inner wall of the middle frame 11. The upper plate 10, the middle frame 11, and the lower plate 12 are welded and fixed to form the housing 1 with an internal accommodating space. The oscillator assembly 2 is elastically suspended within the accommodating space through the elastic element 4.

[0026] The oscillator assembly 2 includes a cuboid mass block 20 with a central mounting hole 200 extending through its thickness, a magnet assembly (not shown) housed within the mounting hole 200, and damping elements 24 located on both sides of the short side of the mass block 20. The magnet assembly includes a support plate 23, a pair of magnets 21 with the same polarity and opposite magnetic poles fixed integrally with the support plate 23, and a yoke 22 positioned between the magnets 21. The magnets 21 and the yoke 22 are fixed to the same side of the support plate 23. The support plate 23 is made of a magnetically conductive material, providing a magnetic field for the motor and becoming part of the magnetic circuit in the linear vibration motor. It guides and concentrates the magnetic field, ensuring that the magnetic field effectively acts on the coils of the stator assembly and the magnet assembly of the oscillator assembly, thereby improving the motor's operating efficiency. The yoke 22 also serves as a supporting structure for the magnetic circuit assembly, providing a stable frame for the oscillator assembly and ensuring its stability during operation, thus guaranteeing the reliability and stability of the motor. The horizontal projected areas of the magnet 21 and yoke 22 are the same, and their vertical projected areas are the same as the area of ​​the support plate. This prevents the oscillator assembly 2 from impacting the coils 31 that are intermittently wrapped around the magnet assembly during reciprocating vibration. Simultaneously, the yoke 22, as a magnetic field guide, needs to provide a low magnetic resistance path for the magnetic field lines. When the area of ​​the yoke 22 is the same as the area of ​​the magnet 21, the magnetic flux can completely cover the cross-section of the yoke 22, avoiding magnetic flux overflow or local saturation caused by area mismatch, thereby reducing magnetic field leakage. The damping element 24 is located between the mass block 20 and the elastic element 4. The damping element 24 is preferably made of foam, which can dissipate vibration energy through its friction and viscosity effects. When the mass block 20 vibrates under the action of the elastic element 4, the damping element 24 generates resistance, slowing down the vibration speed and allowing the vibration system to reach a stable state more quickly. This resistance is proportional to the vibration velocity and in the opposite direction to the vibration, thus effectively reducing the amplitude and frequency of the vibration.

[0027] The mass block 20 includes a clearance groove 203 on one side of the stator assembly for adapting the flexible circuit board 30, a limiting blind groove 201 recessed on both sides of the mounting hole 200 parallel to its short side, and grooves 204 symmetrically arranged on the outer wall of its short side for adapting the damping element 24; the mounting hole 200 and the limiting blind groove 201 are connected, and limiting platforms 202 are formed on both sides of the limiting blind groove 201, the limiting platforms 202 are set to ensure clearance space for the coil 31 in the mounting hole 200 in the long side direction of the mass block 20; the distance between the limiting blind grooves 201 on both sides of the mounting hole 200 is greater than that between the mounting hole 200 and the long side of the mass block 20. The width of the 0 is such that the distance between the limiting platforms 202 on the same side is less than the length of the mounting hole 200. The length and width of the magnet assembly are adapted to the length and width of the limiting blind groove 201, which facilitates the assembly of the magnet assembly and is beneficial to the horizontal positioning of the magnet assembly. The thickness of the magnet assembly is less than the depth of the limiting blind groove 201 to allow for the installation of the coil 31 surrounding the magnet assembly. The setting of the clearance groove 203 is adapted to the flexible circuit board 30, which helps to reduce the thickness of the motor and meet the needs of electronic products for the thinness of the vibration motor. One end of the elastic element 4 is diagonally symmetrically welded and fixed to the short side outer wall of the mass block 20.

[0028] The stator assembly includes a flexible circuit board 30 and a ring coil 31. The width of the mounting hole 200 is greater than the width of the coil 31. The coil 31 stands upright in the mounting hole 200 and is spaced around the magnet assembly. Preferably, the coil 31 is a roughly rectangular ring. The coil 31 is wrapped around the adjacent ends of two magnets. One long side of the coil 31 is bonded and fixed to the flexible circuit board 30. The flexible circuit board 30 is bonded and fixed to the lower plate 12. The flexible circuit board 30 includes an internal power terminal (not shown) and an external power terminal (not shown). The coil 31 is bonded and fixed and stands upright at the internal power terminal to form an electrical connection. The external power terminal extends from the middle frame 11 to accommodate an external power source (not shown). The lower plate 12 is integrally provided with an extension 120 adapted to the external power terminal, which is beneficial to the stability of the external power source.

[0029] After the linear vibration motor of this utility model is assembled, the other long side of the coil 31 abuts against the inner surface of the upper plate 10. In this motor structure, the square coil 31 is clamped between the upper plate 10 and the lower plate 12, ensuring the stability of the coil 31. The stable coil 31 can ensure the stability and reliability of the vibration motor during operation. The stable coil 31 can ensure that the vibration motor maintains a stable vibration frequency and amplitude during operation, providing a more delicate and realistic tactile feedback. The stable coil 31 can reduce unnecessary vibration and noise during the operation of the vibration motor. This provides a quieter vibration experience. At the same time, the stable coil 31 can reduce mechanical wear inside the motor, extend the service life of the vibration motor, and reduce maintenance costs. The magnetization direction of the two magnets 21 is consistent with the vibration direction of the oscillator assembly 2, and the polarity of the adjacent ends of the magnets 21 is the same and the magnetic poles are opposite. That is, the adjacent ends of the magnets 21 are both N poles or S poles, and the other end is also both S poles or N poles. The coil 31 is wrapped around the adjacent ends of the magnets 21, so that almost all the magnetic field lines from the motor magnetic poles can pass through the coil 31. Therefore, the magnetic field utilization rate of the linear vibration motor is greatly improved.

[0030] It should be noted that in the description of this utility model, the terms "upper", "lower", "front", "rear", "left", "horizontal direction", "vertical direction", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A linear vibration motor, comprising a housing with a receiving space, an oscillator assembly, a stator assembly, and a V-shaped elastic element, wherein the two ends of the oscillator assembly are fixedly connected to the housing via the elastic element, and the stator assembly is spaced apart from the oscillator assembly within the receiving space; the oscillator assembly includes a cuboid mass block with a central mounting hole penetrating its thickness direction and a magnet assembly received within the mounting hole; the stator assembly includes a flexible circuit board and a ring coil, characterized in that... The width of the mounting hole is greater than the width of the coil. The coil stands upright in the mounting hole and is spaced around the magnet assembly. The magnet assembly includes a support plate, a pair of magnets with the same polarity and opposite magnetic poles that are fixed integrally with the support plate, and a yoke placed between the magnets.

2. The linear vibration motor of claim 1, wherein, The oscillator assembly further includes a damping element; the mass block includes a relief groove on one side of the stator assembly that adapts to the flexible circuit board, a limiting blind groove recessed on both sides of the mounting hole parallel to its short side, and grooves symmetrically arranged on its short side outer wall for adapting to the damping element; limiting platforms are formed on both sides of the limiting blind groove; the distance between the limiting blind grooves is greater than the width of the mounting hole, and the distance between the limiting platforms is less than the length of the mounting hole; one end of the elastic element is diagonally symmetrically welded and fixed to the short side outer wall of the mass block; the damping element is located between the mass block and the elastic element.

3. The linear vibration motor of claim 2, wherein, The mounting hole and the limiting blind groove are connected.

4. The linear vibration motor of claim 3, wherein, The thickness of the magnet assembly is less than the depth of the limiting blind groove, and the length and width of the magnet assembly are adapted to the length and width of the limiting blind groove.

5. The linear vibration motor of claim 4, wherein, The magnet and the yoke are fixed on the same side of the support plate. The horizontal projected area of ​​the magnet and the yoke is the same, and the vertical projected area of ​​the magnet and the yoke is the same as the area of ​​the support plate.

6. The linear vibration motor of claim 1, wherein, The outer shell includes an upper plate, a lower plate, and a middle frame located between the upper plate and the lower plate, and the other end of the elastic element is welded and fixed to the inner wall of the middle frame.

7. The linear vibration motor of claim 6, wherein, The coil is roughly rectangular in shape and is wrapped around the adjacent ends of two magnets. One long side of the coil is bonded to the flexible circuit board, and the other long side abuts against the inner surface of the upper plate.

8. The linear vibration motor of claim 6, wherein, The middle frame is diagonally symmetrically divided into two parts.

9. The linear vibration motor according to claim 6, characterized in that, The flexible circuit board includes an internal power terminal and an external power terminal; the coil is bonded and fixed and erected on the internal power terminal, and the external power terminal extends from the middle frame into the accommodating space.

10. The linear vibration motor of claim 9, wherein, The lower plate is integrally provided with an extension that is adapted to the external power terminal.

Images