Vibration device

Abstract

Disclosed in the present invention is a vibration device, comprising a vibrator assembly and a stator assembly. The vibrator assembly comprises a movable magnetic portion; the stator assembly comprises an iron core and a coil wound on the iron core; the vibrator assembly and the stator assembly are arranged spaced apart in a second direction; the vibrator assembly vibrates in a third direction perpendicular to the second direction; the axial direction of the iron core is parallel to the third direction; a fixed magnetic portion is mounted on at least one end of the iron core in the third direction; and the fixed magnetic portion and the movable magnetic portion form a magnetic loop. The magnetic circuit of the fixed magnetic portion and the magnetic circuit of the movable magnetic portion form a closed loop, which can effectively reduce magnetic flux leakage of products, improve the utilization rate of magnetic fields, and improve the driving force of products.

Description

A vibration device Technical Field

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

[0002] With the gradual development of electronic product technology, vibration excitation devices have become common functional components in electronic products such as mobile phones and tablets. Existing miniature vibration excitation devices typically include an oscillator assembly and a stator assembly. The oscillator assembly consists of a mass block, a magnet, and a spring, while the stator assembly consists of a finned circuit board (FPCB), damping, limit blocks, and a coil. In order for the oscillator assembly to reciprocate, an electromagnetic interaction must be generated between the coil and the magnet. Changes in the current in the coil create changes in the magnetic field, causing the oscillator assembly to move.

[0003] Linear motors, as actuators for tactile feedback, have been widely used in the field of tactile vibration. However, in existing technologies, the magnetic field utilization rate of the stator assembly's core structure is low, the driving force is small, and there are problems such as large magnetic leakage. Summary of the Invention

[0004] One technical problem to be solved by the present invention is to provide a vibration device.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is: a vibration device, including an oscillator assembly and a stator assembly, wherein the oscillator assembly includes a moving magnetic part, and the stator assembly includes an iron core and a coil wound on the iron core. The oscillator assembly and the stator assembly are arranged at intervals along a second direction, and the oscillator assembly vibrates along a third direction perpendicular to the second direction. The axial direction of the iron core is parallel to the third direction, and a fixed magnetic part is installed at at least one end of the iron core along the third direction. The fixed magnetic part and the moving magnetic part form a magnetic circuit.

[0006] Optionally, a fixed magnetic part is provided at each of the two ends of the iron core along a third direction.

[0007] Optionally, the moving magnet section includes two sets of moving magnet assemblies, and the stator assembly is located between the two sets of moving magnet assemblies.

[0008] Optionally, the moving magnet assembly includes a fixedly connected intermediate magnet and a magnetic guide plate. The intermediate magnet is attached to the side of the magnetic guide plate near the stator assembly, and the magnetization direction of the intermediate magnet is parallel to the second direction.

[0009] Optionally, the moving magnet assembly includes a magnetic guide plate, a central magnet, and side magnets disposed on both sides of the central magnet along the vibration direction. At least a portion of the magnetic guide plate is attached to the side of the central magnet and the side magnets away from the stator assembly, and the magnetization direction of the central magnet is parallel to the second direction.

[0010] The magnetization directions of the two side magnets are opposite and parallel to a third direction, and the polarity of the two side magnets near the middle magnet is the same as the polarity of the middle magnet near the stator assembly.

[0011] Alternatively, the two side magnets are magnetized in the same direction and parallel to the second direction, and the magnetization direction of the side magnets is opposite to that of the middle magnet.

[0012] Optionally, the oscillator further includes a mass block having an oscillator cavity extending through a first direction, two moving magnetic assemblies fixed facing each other within the oscillator cavity, and a stator assembly extending into the oscillator cavity and located between the two moving magnetic assemblies.

[0013] Optionally, the iron core end is provided with two receiving grooves along the second direction, the fixed magnet part includes two fixed magnets arranged along the second direction, the two fixed magnets are respectively fixed in the two receiving grooves, the two fixed magnets are magnetized in opposite directions and parallel to the second direction, and the polarity of the fixed magnets facing the moving magnet assembly is the same as the polarity of the intermediate magnet facing the stator assembly.

[0014] Optionally, the iron core includes a core post for winding the coil, and the core post has pole shoes at both ends along a third direction, with the receiving groove disposed on the pole shoes.

[0015] Optionally, the fixed magnet part includes a fixed magnet having two magnetic regions along the second direction, the magnetization directions of the two magnetic regions being opposite and parallel to the second direction, and the polarity of the fixed magnet facing the moving magnet assembly being the same as the polarity of the intermediate magnet facing the stator assembly.

[0016] Optionally, the iron core includes a core post for winding the coil, and the core post has pole shoes at both ends along a third direction, and the fixed magnet is fixed to the side of the pole shoes away from the core post.

[0017] The beneficial effects of this application are as follows:

[0018] The vibration device described in this application includes an oscillator assembly and a stator assembly. The oscillator assembly includes a moving magnetic part, and the stator assembly includes an iron core and a coil wound on the iron core. The oscillator assembly and the stator assembly are arranged at intervals along a second direction. The oscillator assembly vibrates along a third direction perpendicular to the second direction. The axial direction of the iron core is parallel to the third direction. A fixed magnetic part is installed at at least one end of the iron core along the third direction. The fixed magnetic part and the moving magnetic part form a magnetic circuit. The magnetic circuit of the fixed magnetic part and the magnetic circuit of the moving magnetic part form a closed loop, which can effectively reduce magnetic leakage in the product, improve the utilization rate of the magnetic field, and enhance the driving force of the product. Attached Figure Description

[0019] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the invention. Wherein:

[0020] Figure 1 is an exploded view of the first embodiment of the present invention;

[0021] Figure 2 is a cross-sectional view of the first embodiment of the present invention;

[0022] Figure 3 is a perspective view of the iron core and coil according to the first embodiment of the present invention;

[0023] Figure 4 is a side view of the core and coil according to the first embodiment of the present invention;

[0024] Figure 5 is a structural schematic diagram of the second embodiment of the present invention;

[0025] Figure 6 is a structural schematic diagram of the third embodiment of the present invention;

[0026] Figure 7 is a structural schematic diagram of the fourth embodiment of the present invention;

[0027] Figure 8 is a structural schematic diagram of the fifth embodiment of the present invention;

[0028] Figure 9 is a structural schematic diagram of the sixth embodiment of the present invention;

[0029] In the diagram: 11-mass block; 12-oscillator cavity; 21-middle magnet; 22-side magnet; 3-magnetic plate; 4-fixed magnet; 51-coil; 52-core column; 53-pole shoe; 54-receiving groove. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the following detailed description, only certain exemplary embodiments of the invention are described by way of illustration. Undoubtedly, those skilled in the art will recognize that various modifications can be made to the described embodiments without departing from the spirit and scope of the invention. Therefore, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

[0031] As shown in Figures 1 and 2, the present invention provides a vibration device, including an oscillator assembly and a stator assembly. The oscillator assembly includes a moving magnetic part, and the stator assembly includes an iron core and a coil 51 wound on the iron core. The oscillator assembly and the stator assembly are arranged at intervals along a second direction. The oscillator assembly vibrates along a third direction perpendicular to the second direction. The axial direction of the iron core is parallel to the third direction. A fixed magnetic part is installed at at least one end of the iron core along the third direction. The fixed magnetic part and the moving magnetic part form a magnetic circuit.

[0032] In one embodiment, as shown in Figures 2 and 5 to 9, a fixed magnetic part is provided at each of the two ends of the iron core along a third direction. The two fixed magnetic parts can form a magnetic circuit with the moving magnetic part at both ends.

[0033] In one specific embodiment, the moving magnetic section includes two sets of moving magnetic assemblies, with the stator assembly located between the two sets of moving magnetic assemblies, and a gap between the stator assembly and the moving magnetic assemblies. The two sets of moving magnetic assemblies have a greater driving force, the center of gravity of the oscillator assembly is in the center, and magnetic circuits are formed on both sides of the iron core axis.

[0034] In one embodiment, as shown in Figures 6 and 9, the moving magnet assembly includes a fixedly connected intermediate magnet 21 and a magnetic guide plate 3. The intermediate magnet 21 is attached to the side of the magnetic guide plate 3 near the stator assembly, and the magnetization direction of the intermediate magnet 21 is parallel to a second direction. The magnetic guide plate 3 includes a plate body for bonding the intermediate magnet 21, and the plate body is provided with baffles located on both sides of the intermediate magnet 21, the baffles being perpendicular to the plate body. Along the second direction, the baffles at least partially overlap with the fixed magnet portion.

[0035] With a simple structure, the fixed magnet 4 and the intermediate magnet 21 form a closed loop structure, which can effectively improve magnetic leakage and increase the utilization rate of the magnetic field.

[0036] In another embodiment, as shown in Figures 2 and 7, the moving magnetic assembly includes a magnetic guide plate 3, a central magnet 21, and side magnets 22 disposed on both sides of the central magnet 21 along the vibration direction. At least a portion of the magnetic guide plate 3 is attached to the side of the central magnet 21 and the side magnets 22 away from the stator assembly. The magnetization direction of the central magnet 21 is parallel to a second direction. The magnetization directions of the two side magnets 22 are opposite and parallel to a third direction. The polarity of the side magnets 22 near the central magnet 21 is the same as the polarity of the side of the central magnet 21 near the stator assembly. The magnetic guide plate 3 includes a plate body for bonding the central magnet 21 and the side magnets 22. The plate body is provided with a retaining edge located outside the two side magnets 22, and the retaining edge is perpendicular to the plate body. Along the second direction, the side magnets 22 at least partially overlap with the stationary magnetic part.

[0037] In another embodiment, as shown in Figures 5 and 8, the two side magnets 22 are magnetized in the same direction and parallel to the second direction, and the magnetization direction of the side magnets 22 is opposite to that of the middle magnets 21. Along the second direction, the side magnets 22 and the fixed magnet part overlap at least partially. In this embodiment, the fixed magnet 4, the four side magnets 22, and the two middle magnets 21 also form four closed magnetic circuits, which can improve the problem of magnetic leakage and increase the utilization rate of the magnetic field.

[0038] Optionally, as shown in Figures 1, 2, 5 to 9, the oscillator further includes a mass block 11, the mass block 11 having an oscillator cavity 12 extending through a first direction, the two moving magnetic components being fixed in opposite directions within the oscillator cavity 12, and the stator component extending into the oscillator cavity 12 and located between the two moving magnetic components.

[0039] In one embodiment, as shown in Figures 2, 5 and 6, the end of the iron core is provided with two receiving grooves 54 along the second direction. The fixed magnet part includes two fixed magnets 4 arranged along the second direction. The two fixed magnets 4 are respectively fixed in the two receiving grooves 54. The two fixed magnets 4 are magnetized in opposite directions and parallel to the second direction. The polarity of the fixed magnets 4 facing the moving magnet assembly is the same as the polarity of the intermediate magnet 21 facing the stator assembly.

[0040] Further, as shown in Figures 2, 3 and 4, the iron core includes a core post 52 for winding the coil 51. Both ends of the core post 52 along a third direction are provided with pole shoes 53. The pole shoes 53 are perpendicularly connected to the core post 52, and the receiving groove 54 is provided on the pole shoes 53.

[0041] In another embodiment, as shown in Figures 7, 8, and 9, the fixed magnet part includes a fixed magnet 4. The fixed magnet 4 has two magnetic regions along the second direction, and the magnetization directions of the two magnetic regions are opposite and parallel to the second direction. The fixed magnet 4 is an integral multi-pole magnet. The polarity of the fixed magnet 4 facing the moving magnet assembly is the same as the polarity of the intermediate magnet 21 facing the stator assembly.

[0042] Furthermore, the iron core includes a core post 52 for winding the coil 51, and the core post 52 is provided with pole shoes 53 at both ends along a third direction. The fixed magnet 4 is fixed to the side of the pole shoes 53 away from the core post 52.

[0043] In this embodiment, a multi-pole magnetized magnet is used as the fixed magnet 4. The number of fixed magnets 4 at each end of the iron core is reduced from two to one. Furthermore, there is no need to provide receiving grooves 54 on the pole shoes 53. The fixed magnets 4 are directly bonded to the side end face of the pole shoes 53 away from the core post 52, simplifying the manufacturing process and saving production costs. Simultaneously, the two fixed magnets 4, four side magnets 22, and two intermediate magnets 21 form four closed magnetic circuits, significantly improving magnetic leakage and increasing the utilization rate of the magnetic field.

[0044] The first direction, the second direction, and the third direction mentioned above are perpendicular to each other, and their directions are shown in the upper right corner of Figure 1.

[0045] Figures 2, 5 to 9 show a specific embodiment of the current direction in coil 51, labeled... The symbol ⊙ indicates that the current direction is perpendicular to the plane of the diagram and points inwards, while the symbol ⊙ indicates that the current direction is perpendicular to the plane of the diagram and points outwards.

[0046] As shown in Figure 2, four fixed magnets 4, four side magnets 22, and two intermediate magnets 21 form four closed magnetic circuits. The magnetization direction of the fixed magnets 4 is perpendicular to that of the adjacent side magnets 22, and the magnetization direction of the side magnets 22 is perpendicular to that of the adjacent intermediate magnets 21. By designing different magnetization directions for each magnet, the moving magnetic part of the oscillator assembly forms two sets of Halbach magnetic circuits. The strongest magnetic field is generated with the fewest magnets. The special arrangement of the magnet units enhances the field strength per unit direction. This solves the problem of large magnetic leakage in the prior art, improves the utilization rate of the magnetic field, and enhances the driving force of the product. It has the advantages of high effective utilization rate of magnetic field, low magnetic leakage, and fast response.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A vibration device comprising an oscillator assembly and a stator assembly, the oscillator assembly including a moving magnet, the stator assembly including an iron core and a coil wound on the iron core, the oscillator assembly and the stator assembly being arranged at intervals along a second direction, the oscillator assembly vibrating along a third direction perpendicular to the second direction, characterized in that: The axial direction of the iron core is parallel to a third direction, and a fixed magnetic part is installed at at least one end of the iron core along the third direction, the fixed magnetic part and the moving magnetic part forming a magnetic circuit.

2. The vibration device according to claim 1, characterized in that: The iron core is provided with a fixed magnetic part at each of its two ends along a third direction.

3. The vibration device according to claim 1, characterized in that: The moving magnetic section includes two sets of moving magnetic assemblies, and the stator assembly is located between the two sets of moving magnetic assemblies.

4. The vibration device according to claim 3, characterized in that: The moving magnet assembly includes a fixedly connected intermediate magnet and a magnetic guide plate. The intermediate magnet is attached to the side of the magnetic guide plate near the stator assembly, and the magnetization direction of the intermediate magnet is parallel to the second direction.

5. The vibration device according to claim 3, characterized in that: The moving magnet assembly includes a magnetic guide plate, a central magnet, and side magnets disposed on both sides of the central magnet along the vibration direction. At least a portion of the magnetic guide plate is attached to the side of the central magnet and the side magnets away from the stator assembly. The magnetization direction of the central magnet is parallel to the second direction. The magnetization directions of the two side magnets are opposite and parallel to a third direction, and the polarity of the two side magnets near the middle magnet is the same as the polarity of the middle magnet near the stator assembly. Alternatively, the two side magnets are magnetized in the same direction and parallel to the second direction, and the magnetization direction of the side magnets is opposite to that of the middle magnet.

6. The vibration device according to claim 3, characterized in that: The oscillator also includes a mass block having an oscillator cavity extending through a first direction, two moving magnetic assemblies fixed in opposite directions within the oscillator cavity, and a stator assembly extending into the oscillator cavity and located between the two moving magnetic assemblies.

7. The vibration device according to claim 4 or 5, characterized in that: The iron core end is provided with two receiving grooves along the second direction. The fixed magnet part includes two fixed magnets arranged along the second direction. The two fixed magnets are respectively fixed in the two receiving grooves. The two fixed magnets are magnetized in opposite directions and parallel to the second direction. The polarity of the fixed magnets facing the moving magnet assembly is the same as the polarity of the intermediate magnet facing the stator assembly.

8. The vibration device according to claim 7, characterized in that: The iron core includes a core post for winding the coil, and the core post has pole shoes at both ends along a third direction, with receiving grooves disposed on the pole shoes.

9. The vibration device according to claim 4 or 5, characterized in that: The fixed magnet part includes a fixed magnet with two magnetic regions along the second direction. The magnetization directions of the two magnetic regions are opposite and parallel to the second direction. The polarity of the fixed magnet facing the moving magnet assembly is the same as the polarity of the intermediate magnet facing the stator assembly.

10. The vibration device according to claim 9, characterized in that: The iron core includes a core post for winding the coil, and the core post has pole shoes at both ends along a third direction. The fixed magnet is fixed to the side of the pole shoes away from the core post.

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