Vibration device

Abstract

A vibration device disclosed by the present invention comprises a vibrator assembly and a stator assembly which are arranged at an interval along a second direction, the vibrator assembly vibrates along a third direction perpendicular to the second direction, the vibrator assembly comprises a magnetic assembly, and the magnetic assembly comprises a first magnetic conductive plate, a second magnetic conductive plate and a permanent magnet. The permanent magnet is fixedly installed on the side, facing the stator assembly, of the first magnetic conductive plate, the second magnetic conductive plate is fixedly installed on the side, deviating from the stator assembly, of the first magnetic conductive plate, and the two ends, in the third direction, of one of the first magnetic conductive plate and the second magnetic conductive plate are provided with first bent edges surrounding the two sides of the permanent magnet. The two ends, in the first direction, of the other magnetic conductive plate are provided with second bent edges surrounding the two sides of the first magnetic conductive plate and the two sides of the permanent magnet. The structure of the double-layer magnetic conductive plate can effectively reduce magnetic short circuit, shields magnetic induction lines inside, greatly reduces the magnetic leakage phenomenon of the product, improves the utilization rate of the magnetic field of the vibration device, and improves the driving force of the product.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic products, and in particular to a vibration device. Background Art

[0002] With the gradual development of electronic product technology, vibration excitation devices have become commonly used functional devices in electronic products such as mobile phones and tablets. Existing micro vibration excitation devices usually include a vibrator assembly and a stator assembly. The vibrator assembly is composed of a mass block, a magnet and a spring, and the stator assembly is composed of an FPCB, a damper, a limit block, an iron core and a coil. In order for the vibrator assembly to vibrate back and forth, an electromagnetic effect must be generated between the coil and the magnet. The change in the current in the coil causes a change in the magnetic field, causing the vibrator assembly to move.

[0003] As an actuator for tactile feedback, linear motors have been widely used in the field of tactile vibration. In the prior art, the magnetic field of the magnetic circuit of the stator assembly iron core structure has low effective utilization rate, small driving force, and large magnetic leakage. Summary of the invention

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

[0005] To solve the above technical problems, the technical solution of the present invention is: a vibration device, comprising a vibrator assembly and a stator assembly, the vibrator assembly and the stator assembly are arranged at intervals along a second direction, the vibrator assembly vibrates along a third direction perpendicular to the second direction, the vibrator assembly comprises a magnetic assembly, the magnetic assembly comprises a first magnetic conductive plate, a second magnetic conductive plate and a permanent magnet, the permanent magnet is fixedly connected to the side of the first magnetic conductive plate facing the stator assembly, the second magnetic conductive plate is fixedly connected to the side of the first magnetic conductive plate away from the stator assembly, one of the first magnetic conductive plate and the second magnetic conductive plate is provided with a first bent edge enclosing both sides of the permanent magnet at both ends along the third direction, and the other magnetic conductive plate is provided with a second bent edge enclosing both sides of the permanent magnet at both ends along the first direction perpendicular to both the second direction and the third direction.

[0006] Optionally, there are two magnetic assemblies, and the two magnetic assemblies are respectively located on both sides of the stator assembly along the second direction and are spaced apart from each other.

[0007] Optionally, the first magnetic conductive plate is provided with first bent edges at both ends along the third direction to enclose the permanent magnet, and the second magnetic conductive plate is provided with second bent edges at both ends along the first direction to enclose the first magnetic conductive plate and the permanent magnet.

[0008] Optionally, along the first direction, a gap is left between the second bent edge and the permanent magnet.

[0009] Optionally, the permanent magnet includes a middle magnet and side magnets fixed to the first magnetic conductive plate, and the side magnets are respectively provided on both sides of the middle magnet along the third direction, the magnetizing direction of the middle magnet is parallel to the second direction, the magnetizing direction of the side magnet is parallel to the third direction, the magnetizing directions of the two side magnets are opposite, and the polarity of the side magnet close to the middle magnet is the same as the polarity of the middle magnet close to the stator assembly.

[0010] Optionally, the vibrator assembly further includes a mass block, the mass block has a vibrator cavity penetrating along a first direction, the two magnetic assemblies are fixed in the vibrator cavity facing each other, and the stator assembly extends into the vibrator cavity and is located between the two magnetic assemblies.

[0011] Optionally, the stator assembly includes an iron core and a coil wound around the iron core, and the axial direction of the iron core is parallel to the third direction; the coil is located between the two intermediate magnets.

[0012] Optionally, the iron core includes a core column for winding the coil, and pole shoes are provided at both ends of the core column along the third direction, and the coil is located between the two pole shoes.

[0013] Optionally, a magnetic conductive block is provided on the outer side of the pole shoe, and along the third direction, the magnetic conductive block extends outward to between the corresponding side magnets of the two permanent magnets.

[0014] Optionally, the magnetic conductive block and the pole shoe are an integral structure; the magnetic conductive block is in line with the side magnet height along the first direction.

[0015] The beneficial effects of this application are:

[0016] The vibration device described in the present application includes a vibrator assembly and a stator assembly arranged at intervals along a second direction. The vibrator assembly vibrates along a third direction perpendicular to the second direction. The vibrator assembly includes a magnetic assembly. The magnetic assembly includes a first magnetic conductive plate, a second magnetic conductive plate and a permanent magnet. The permanent magnet is fixedly installed on the side of the first magnetic conductive plate facing the stator assembly, and the second magnetic conductive plate is fixedly installed on the side of the first magnetic conductive plate away from the stator assembly. One of the first magnetic conductive plate and the second magnetic conductive plate is provided with a first bent edge enclosing both sides of the permanent magnet at both ends along the third direction, and the other magnetic conductive plate is provided with a second bent edge enclosing both sides of the first magnetic conductive plate and the permanent magnet at both ends along the first direction. The structure of the double-layer magnetic conductive plate can effectively reduce magnetic short circuits, shield magnetic flux lines inside, greatly reduce magnetic leakage of the product, improve the utilization rate of the magnetic field of the vibration device, and enhance the driving force of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following drawings are intended only to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0018] Figure 1 is an exploded view of a first embodiment of the present invention;

[0019] Figure 2 It is a structural schematic diagram of a stator assembly and a magnetic assembly according to a first embodiment of the present invention;

[0020] Figure 3 is a schematic structural diagram of a magnetic assembly according to a first embodiment of the present invention;

[0021] Figure 4 It is a schematic diagram of the assembly structure of the first magnetic conductive plate and the second magnetic conductive plate according to the first embodiment of the present invention;

[0022] Figure 5 This is a distribution diagram of magnetic flux lines in the first embodiment of the present invention;

[0023] Figure 6 The magnetization direction diagram of the first embodiment of the present invention is

[0024] Figure 7 is a cross-sectional view of a second embodiment of the present invention;

[0025] Figure 8 is a magnetization direction diagram of a third embodiment of the present invention;

[0026] Fig. 9 This is a distribution diagram of magnetic flux lines according to a third embodiment of the present invention.

[0027] In the figure: 11-first magnetic conductive plate; 12-second magnetic conductive plate; 13-first bending edge; 14-second bending edge; 21-middle magnet; 22-side magnet; 31-mass block; 32-oscillator cavity; 41-coil; 42-core column; 43-pole shoe; 44-magnetic conductive block. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with the accompanying drawings and examples. In the following detailed description, certain exemplary embodiments of the present invention are described only by way of illustration. Needless to say, those of ordinary skill in the art will recognize that the described embodiments may be modified in various ways without departing from the spirit and scope of the present invention. Therefore, the drawings and description are illustrative in nature and are not intended to limit the scope of protection of the claims.

[0029] like Figures 1 to 9As shown, a vibration device includes a vibrator assembly and a stator assembly, wherein the vibrator assembly and the stator assembly are arranged in a second direction at intervals, the vibrator assembly vibrates in a third direction perpendicular to the second direction, and the vibrator assembly includes a magnetic assembly, such as Figure 2 , Figure 3 and Figure 4 As shown, the magnetic assembly includes a first magnetic conductive plate 11, a second magnetic conductive plate 12 and a permanent magnet, the permanent magnet is fixedly mounted on the side of the first magnetic conductive plate 11 facing the stator assembly, and the second magnetic conductive plate 12 is fixedly mounted on the side of the first magnetic conductive plate 11 away from the stator assembly; the first magnetic conductive plate 11 is provided with first bent edges 13 enclosing both sides of the permanent magnet at both ends along the third direction, preferably, the first bent edge 13 is vertically arranged to the first magnetic conductive plate 11; the second magnetic conductive plate 12 is provided with second bent edges 14 enclosing both sides of the first magnetic conductive plate 11 and the permanent magnet at both ends along the first direction, preferably, the second bent edge 14 is vertically arranged to the second magnetic conductive plate 12. The first direction is perpendicular to both the second direction and the third direction, such as Figure 1 shown.

[0030] Alternatively, the second magnetic conductive plate 12 is provided with a first bent edge 13 at both ends along the third direction for enclosing both sides of the permanent magnet, and preferably, the first bent edge 13 is perpendicular to the second magnetic conductive plate 12; the first magnetic conductive plate 11 is provided with a second bent edge 14 at both ends along the first direction for enclosing both sides of the second magnetic conductive plate 12 and the permanent magnet, and preferably, the second bent edge 14 is perpendicular to the first magnetic conductive plate 11.

[0031] In one embodiment, if Figure 2 As shown, there are two magnetic assemblies, and the two magnetic assemblies are respectively located on both sides of the stator assembly along the second direction and are spaced apart from each other.

[0032] In one embodiment, if Figure 2 As shown, along the first direction, a gap is left between the second bent edge 14 and the permanent magnet, and the gap setting can reduce magnetic leakage in this direction.

[0033] Furthermore, the thickness of the first magnetic conductive plate 11 and the second magnetic conductive plate 12 are different. The thickness of the first magnetic conductive plate 11 can be greater than the thickness of the second magnetic conductive plate 12, or the thickness of the first magnetic conductive plate 11 can be less than the thickness of the second magnetic conductive plate 12. The two magnetic conductive plates are processed separately and then assembled with the permanent magnet as required. The split design has a relatively simple structure for each component and is easy to process.

[0034] Alternatively, the thickness of the first magnetic conductive plate 11 and the second magnetic conductive plate 12 are the same, and the first magnetic conductive plate 11 and the second magnetic conductive plate 12 can be a split structure, and the two magnetic conductive plates are processed separately and then assembled with the permanent magnet as required; the first magnetic conductive plate 11 and the second magnetic conductive plate 12 can also be designed as an integrated structure, the integrated magnetic conductive plate includes a magnetic conductive plate body fixedly connected to the permanent magnet, and the magnetic conductive plate body is provided with four bent edges surrounding the permanent magnet, and a gap is left between the two bent edges on both sides of the permanent magnet along the first direction and the permanent magnet. The thickness of the bent edge can be adjusted as needed, for example, the thickness of the bent edge is consistent with the thickness of the magnetic conductive plate body, or the thickness of the bent edge is less than the thickness of the magnetic conductive plate body.

[0035] In one embodiment, the permanent magnet includes a middle magnet 21 and a side magnet 22. Along the third direction, a side magnet 22 is arranged on both sides of the middle magnet 21. The middle magnet 21 is fixedly mounted on the side of the first magnetic conductive plate 11 facing the stator assembly. The middle magnet 21 is connected to the first magnetic conductive plate 11 by bonding. The magnetizing direction of the middle magnet 21 is parallel to the second direction, the magnetizing direction of the side magnet 22 is parallel to the third direction, the magnetizing directions of the two side magnets 22 are opposite, and the polarity of the side magnet 22 close to the middle magnet 21 is the same as the polarity of the middle magnet 21 close to the stator assembly.

[0036] Furthermore, if Figure 6 As shown, the magnetization direction of the middle magnet 21 points from the first magnetic plate 11 side to the stator assembly side, and the magnetization components of the side magnets 22 point from the outside to the middle magnet 21. The distribution of magnetic flux lines is shown in Figure 6 As shown, four closed magnetic circuits passing through the coil 41 are formed between the stator assembly and the vibrator assembly. The middle magnet 21 and the side magnet 22 form a Halbach magnetic circuit (Halbach array magnetic circuit), which can generate a unilateral magnetic field distribution and generate the strongest magnetic field through a small number of magnets, and utilize the arrangement of special magnet units to enhance the field strength in a unit direction.

[0037] Furthermore, if Figure 8 As shown, the magnetization direction of the middle magnet 21 points from the stator component side to the first magnetic conductive plate 11 side, and the magnetization component of the side magnet 22 points from the middle magnet 21 side to the outside. The distribution of magnetic flux lines is as shown in FIG. Fig. 9 As shown, four closed magnetic circuits passing through the coil 41 are formed between the stator assembly and the vibrator assembly. The middle magnet 21 and the side magnet 22 form a Halbach magnetic circuit (Halbach array magnetic circuit), which can generate a unilateral magnetic field distribution and generate the strongest magnetic field through a small number of magnets, and utilize the arrangement of special magnet units to enhance the field strength in a unit direction.

[0038] In one embodiment, the vibrator assembly further includes a mass block 31, the mass block 31 has a vibrator cavity 32 penetrating along a first direction, the two magnetic assemblies are fixed in the vibrator cavity 32 facing each other, and the stator assembly extends into the vibrator cavity 32 and is located between the two magnetic assemblies. The vibrator assembly and the stator assembly are arranged at intervals along the second direction, that is, there is a gap between the stator assembly and the magnetic assemblies on both sides. There is a gap between the inner wall of the vibrator cavity 32 along the third direction and the stator assembly.

[0039] In one embodiment, the stator assembly includes an iron core and a coil 41 wound on the iron core, wherein the axial direction of the iron core is parallel to the third direction; the coil 41 is located between the two intermediate magnets 21, that is, along the third direction, the two ends of the intermediate magnet 21 extend outwardly over the two ends of the coil 41, the width of the intermediate magnet 21 along the third direction is greater than the axial length of the coil 41, and the center line of the intermediate magnet 21 coincides with the center line of the coil 41. The iron core includes a core column 42 for winding the coil 41, and pole shoes 43 are provided at both ends of the core column 42 along the third direction, and the coil 41 is located between the two pole shoes 43.

[0040] Furthermore, a magnetic conductive block 44 is disposed on the outer side of the pole shoe 43, and the magnetic conductive block 44 extends outwardly to between the side magnets 22 of the two permanent magnets along the third direction. The magnetic conductive block 44 and the pole shoe 43 are an integral structure; the magnetic conductive block 44 is in line with the side magnet 22 in the first direction. The magnetic conductive blocks 44 disposed on both sides of the core can guide the magnetic flux lines to the position of the side magnets 22, so that the magnetic flux lines are more concentrated and the degree of closure of the magnetic flux lines is increased.

[0041] As an improvement, Figure 7 As shown, the pole shoe 43 may not be provided with the magnetic conductive block 44. In order to better introduce the magnetic lines of force to the position of the side magnet 22, the thickness of the pole shoe 43 may be directly increased in the third direction so that the pole shoe 43 also serves as the magnetic conductive block 44.

[0042] by Figure 6Taking the distribution of magnetic flux lines of the present technical solution as an example, the magnetic flux lines emitted by the middle magnet 21 pass through the coil 41 and extend to both sides along the core column 42 of the iron core. The magnetic flux lines in one direction are guided by the magnetic conductive block 44 on the side to between the corresponding two side magnets 22 of the two permanent magnets. The magnetic flux lines pass through the side magnets 22 and return to the middle magnet 21. This is a closed magnetic circuit. In the present technical solution, four closed magnetic circuits are formed between the stator assembly and the permanent magnet. These four closed magnetic circuits all pass through the coil 41 and are distributed at the four corners of the iron core. The first magnetic conductive plate 11 and the second magnetic conductive plate 12 are located on the outside of the permanent magnet. The second magnetic conductive plate 12 forms a shielding plate in the non-vibration direction, that is, the second magnetic conductive plate 12 plays a shielding role in the second direction, and the second bent edge 14 plays a shielding role in the first direction. With the cooperation of the first magnetic conductive plate 11 and the second magnetic conductive plate 12, the structural layout of the present vibration device can effectively reduce magnetic short circuits, and can also play a shielding role, thereby reducing the magnetic leakage phenomenon of the product.

[0043] The first direction, the second direction and the third direction are perpendicular to each other, and the directions of the first direction, the second direction and the third direction are as follows: Figure 1 Shown in the upper right corner.

[0044] exist Figures 5 to 9 In the figure, a specific implementation of the current direction of the coil 41 is shown, and the marking The symbol ⊙ represents the direction of current is perpendicular to the figure and inward, and the symbol ⊙ represents the direction of current is perpendicular to the figure and outward.

[0045] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A vibration device, comprising a vibrator assembly and a stator assembly, wherein the vibrator assembly and the stator assembly are arranged at intervals along a second direction, and the vibrator assembly vibrates along a third direction perpendicular to the second direction, characterized in that: The vibrator assembly includes a magnetic assembly, which includes a first magnetic conductive plate, a second magnetic conductive plate and a permanent magnet, the permanent magnet is fixedly connected to a side of the first magnetic conductive plate facing the stator assembly, the second magnetic conductive plate is fixedly connected to a side of the first magnetic conductive plate facing away from the stator assembly, one of the first magnetic conductive plate and the second magnetic conductive plate is provided with a first bent edge enclosing both sides of the permanent magnet at both ends along the third direction, and the other magnetic conductive plate is provided with a second bent edge enclosing both sides of the permanent magnet at both ends along a first direction perpendicular to both the second direction and the third direction.

2. The vibration device according to claim 1, characterized in that: The number of the magnetic components is two, and the two magnetic components are respectively located on two sides of the stator component along the second direction and are spaced apart from each other.

3. The vibration device according to claim 1, characterized in that: The first magnetic conductive plate is provided with first bent edges at both ends along the third direction to enclose the permanent magnet, and the second magnetic conductive plate is provided with second bent edges at both ends along the first direction to enclose the first magnetic conductive plate and the permanent magnet.

4. The vibration device according to claim 3, characterized in that: Along the first direction, a gap is left between the second bent edge and the permanent magnet.

5. The vibration device according to claim 1, characterized in that: The permanent magnet includes a middle magnet and side magnets fixed to the first magnetic conductive plate. Along the third direction, the side magnets are respectively provided on both sides of the middle magnet. The magnetization direction of the middle magnet is parallel to the second direction, and the magnetization direction of the side magnet is parallel to the third direction. The magnetization directions of the two side magnets are opposite, and the polarity of the side magnet close to the middle magnet is the same as the polarity of the middle magnet close to the stator assembly.

6. The vibration device according to claim 2, characterized in that: The vibrator assembly also includes a mass block, which has a vibrator cavity penetrating along a first direction, the two magnetic assemblies are fixed in the vibrator cavity facing each other, and the stator assembly extends into the vibrator cavity and is located between the two magnetic assemblies.

7. The vibration device according to claim 5, characterized in that: The stator assembly comprises an iron core and a coil wound on the iron core, wherein the axial direction of the iron core is parallel to the third direction; and the coil is located between the two middle magnets.

8. The vibration device according to claim 7, characterized in that: The iron core comprises a core column for winding the coil, and pole shoes are provided at both ends of the core column along the third direction, and the coil is located between the two pole shoes.

9. The vibration device according to claim 8, characterized in that: A magnetic conductive block is arranged on the outer side of the pole shoe, and along the third direction, the magnetic conductive block extends outward to between the corresponding side magnets of the two permanent magnets.

10. The vibration device according to claim 9, characterized in that: The magnetic conductive block and the pole shoe are an integrated structure; the magnetic conductive block is in the same height as the side magnet along the first direction.

Images