Ultra-thin moving magnet type linear vibration motor
By horizontally arranging the vibrator assembly and stator assembly and combining the magnetic permeable housing design, the problem of low space utilization of existing linear vibration motors is solved, a thinner vibration motor structure is realized, and the vibration performance and magnetic field strength is improved, which is suitable for thin and thin electronic equipment.
Patent Information
- Application Number
- CN202422145158.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-02
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-09-02
AI Technical Summary
The existing horizontal linear vibrating motors have low space utilization due to the upper and lower interval between the vibrator components and the stator components, which cannot meet the lightness and thinness requirements of electronic equipment. In addition, the magnetic circuit design requires a certain thickness space and cannot reduce the product height.
The oscillator assembly and the stator assembly are located on the same horizontal plane, and the coil and magnetic steel are arranged horizontally. Combined with the magnetic conduction shell design, it reduces the magnetic circuit gap, reduces the thickness of the vibration motor, and achieves vibration through the horizontal magnetic field action.
It realizes the thickness of the vibration motor, improves the space utilization, is suitable for thinner electronic devices, and at the same time improves vibration performance and magnetic field strength.
Smart Images
Figure CN223156943U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of vibration motors, in particular to an ultra-thin moving magnet linear vibration motor. Background Art
[0002] With the development of electronic technology, portable consumer electronic devices have gradually occupied the global consumer market, such as tablet computers, mobile phones, handheld game consoles, multimedia entertainment devices, etc. These electronic devices generally use vibration motors for tactile feedback, such as vibration feedback of tablet computers. To meet the increasingly thin trend of electronic devices, the application of linear vibration motors is becoming more and more common.
[0003] Existing linear vibration motors usually include horizontal linear vibration motors, which include a vibrator assembly with a mass block for accommodating a magnet, and a stator assembly provided with a coil and a flexible circuit board. The vibrator assembly and the stator assembly are arranged at intervals up and down, and the coil and the magnet are corresponding up and down. According to the principle of electromagnetic induction, a magnetic field is generated by passing an electric current through the coil, and by alternately changing the direction of the current in the coil, an alternating driving force is generated to drive the vibrator assembly equipped with the magnet to perform a reciprocating cyclic motion. When the alternating frequency is equivalent to the natural frequency of the motor itself, a resonance effect is generated. However, the up-and-down spaced structure of the vibrator assembly and the stator assembly cannot solve the problem of the space utilization rate of the horizontal linear vibration motor in the vertical direction of limited electronic devices. At the same time, in order to generate sufficient driving force between the coil and the magnet in the related art, the magnetic circuit design requires a certain thickness space, which makes the height of the existing horizontal linear vibration motor products unable to be reduced and cannot meet the development direction of the thin and light of common electronic devices. Therefore, it is necessary to provide a new horizontal linear vibration motor to solve the above problems. Summary of the Utility Model
[0004] Based on the above problems, the utility model proposes an ultra-thin moving magnet linear vibration motor with a simple structure and good vibration performance.
[0005] To achieve the above object, the present utility model provides an ultra-thin moving magnet type linear vibration motor, which includes a square housing having an accommodation space, a stator assembly and a vibrator assembly horizontally spaced apart in the accommodation space, and elastic members disposed on the left and right sides of the vibrator assembly to elastically support it in the accommodation space; the stator assembly includes a rectangular coil and a flexible circuit board; the vibrator assembly includes a mass block having a square relief through groove, a sheet-shaped bracket fixed on the mass block, and a first magnet and a second magnet horizontally arranged side by side and spaced apart and fixed on the bracket and located in the relief through groove. The coil protrudes and extends into the relief through groove. The first magnet is spaced around the inside of the coil, and the second magnet is spaced on both sides of the coil; the long side of the coil is horizontally arranged side by side with the first magnet and the second magnet in the relief through groove and the distances between them are equal.
[0006] Preferably, the housing includes an upper cover plate, a middle frame connected to the vibrator assembly, and a lower cover plate for fixing the stator assembly. The upper cover plate, the middle frame and the lower cover plate enclose to form the accommodation space.
[0007] Preferably, the flexible circuit board and the coil are fixed on the lower cover plate; the flexible circuit board is located outside the short side of the coil.
[0008] Preferably, the upper cover plate and the lower cover plate are provided with through grooves penetrating their thickness corresponding to the coil; the long sides of the coil symmetrically cover the through grooves.
[0009] Preferably, the upper surface of the mass block is flush with the upper surface of the bracket; the lower surfaces of the first magnet and the second magnet do not protrude from the lower surface of the mass block.
[0010] Preferably, there is a gap between the upper surface of the mass block and the inner surface of the upper cover plate, and there is a gap between the lower surface of the mass block and the upper surface of the flexible circuit board; there is a gap between the upper surface of the coil and the lower surface of the bracket in the thickness direction of the coil.
[0011] Preferably, the bracket includes a first support portion and a second support portion respectively adapted and fixed to the first magnet and the second magnet. The widths of the first support portion and the second support portion are respectively less than or equal to the widths of the first magnet and the second magnet; the first support portion and the second support portion are located in the relief through groove.
[0012] Preferably, the first magnet is provided as one with segmented magnetization, and the upper and lower magnetic poles on the left and right sides of the first magnet are opposite; the magnetic pole on the left side of the first magnet is the same as the magnetic pole of the second magnet on its left side, and the magnetic pole on the right side of the first magnet is the same as the magnetic pole of the second magnet on its right side.
[0013] Preferably, one end of the elastic member is fixedly connected to the mass block, and the other end is fixedly connected to the inner wall of the middle frame to support the horizontal reciprocating movement of the oscillator assembly.
[0014] Preferably, the mass block and the bracket are integrally provided.
[0015] Compared with the prior art, the oscillator assembly and the stator assembly of the ultra-thin moving magnet linear vibration motor of the present invention are located on the same horizontal plane, and the coils and the permanent magnets are horizontally arranged at the same interval, thereby reducing the thickness dimension of the vibration motor and making it better applied to thinner and lighter electronic devices. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 is an exploded view of the structure of the first embodiment.
[0017] Figure 2 is an exploded view of the structure of the middle frame, the elastic member and the oscillator assembly of the first embodiment.
[0018] Figure 3 is a sectional view taken along the X direction of the first embodiment.
[0019] Figure 4 is Figure 3 an enlarged front view of part A.
[0020] Figure 5 is a schematic diagram of the structure of the oscillator assembly of the second embodiment.
[0021] Wherein:
[0022] 1 - housing; 10 - upper cover plate; 11 - lower cover plate; 12 - middle frame; 13 - through groove;
[0023] 2 - stator assembly; 20 - flexible circuit board; 21 - coil;
[0024] 3 - oscillator assembly; 30 - mass block; 31 - bracket; 32 - first permanent magnet; 33 - second permanent magnet;
[0025] 300 - relief through hole; 310 - first support portion; 311 - second support portion;
[0026] 4 - elastic member. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than 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 efforts shall fall within the protection scope of the present utility model.
[0028] The structure of a thin-film moving magnet linear vibration motor according to the first embodiment of the present utility model is as Figures 1 to 4 shown, which includes a square housing 1 having an accommodation space, an oscillator assembly 2 and a stator assembly 3 horizontally spaced apart in the accommodation space, and elastic members 4 disposed on the left and right sides of the oscillator assembly 2 to elastically support it in the accommodation space. One end of the elastic member 4 is connected and fixed to the oscillator assembly 2, and the other end is connected and fixed to the housing 1 to support the oscillator assembly 2 to reciprocate horizontally in the accommodation space.
[0029] The housing 1 is made of a magnetic conductive material and includes an upper cover plate 10, a lower cover plate 11, and a middle frame 12 elastically connected to the oscillator assembly 2. The upper cover plate 10, the lower cover plate 11, and the middle frame 12 enclose to form the accommodation space, and the stator assembly 2 is fixed on the inner surface of the lower cover plate 11.
[0030] The stator assembly 2 includes a flexible circuit board 20 and a rectangular coil 21; the flexible circuit board 20 and the coil 21 are fixed side by side on the lower cover plate, and the flexible circuit board 20 is located outside the short side of the coil 21; the upper cover plate 10 and the lower cover plate 11 are provided with through slots 13 penetrating through their thickness corresponding to the coil 21; the long sides of the coil 21 symmetrically cover the through slots 13, and the setting of the through slots 13 forms a magnetic path gap to reduce the eddy current loss of the vibration motor and prevent magnetic saturation, thereby improving the magnetic field strength and the stability of the vibration motor.
[0031] The oscillator assembly 3 includes a mass block 30 having a square relief through slot 300, a sheet-shaped bracket 31 fixed on the mass block 30, and a first magnet 32 and a second magnet 33 horizontally arranged side by side and spaced apart and fixed on the bracket 31 and located in the relief through slot 300. Among them, the bracket 31 includes a first support portion 310 and a second support portion 311 respectively adapted and fixed to the first magnet 32 and the second magnet 33. The first support portion 310 and the second support portion 311 are located in the relief through slot 300, and the widths of the first support portion 310 and the second support portion 311 are respectively less than or equal to the widths of the first magnet 32 and the second magnet 33 to prevent the bracket 31 from covering the coil 21 during the reciprocating movement of the oscillator assembly 3 and interfering with the magnetic force distribution of the vibration motor; one end of the elastic member 4 is connected and fixed to the mass block 30, and the other end is connected and fixed to the inner wall of the middle frame 12 to support the oscillator assembly 3 to reciprocate horizontally.
[0032] The assembled vibration motor is as Figure 3 andFigure 4 As shown in the figure, the coil 21 protrudes and extends into the relief through groove 300. The first magnet 32 is spaced around the coil 21, and the second magnet 33 is spaced on both sides of the coil 21. The coil 21 is horizontally arranged side by side with the first magnet 32 and the second magnet 33 along its long side in the relief through groove 300 and the spacing between them is equal to ensure uniform distribution of magnetic lines of force. Among them, there is a gap between the upper surface of the mass block 30 and the inner surface of the upper cover plate 10. The upper surface of the mass block 30 is flush with the upper surface of the bracket 31. There is a gap between the lower surface of the mass block 30 and the upper surface of the flexible circuit board 20. The lower surfaces of the first magnet 32 and the second magnet 33 do not protrude beyond the lower surface of the mass block 30, so that the oscillator assembly 3 will not collide or rub against the upper cover plate 10 and the lower cover plate 11 during the reciprocating process. Since the length of the coil 21 is greater than the lengths of the first magnet 32 and the second magnet 33, a part of the vertical projection of the short side of the coil 21 coincides with the bracket 31. Therefore, there is a gap between the upper surface of the coil 21 and the lower surface of the bracket 31 in the thickness direction of the coil 21 to prevent the oscillator assembly 3 from colliding or rubbing against the coil 21 during the reciprocating process, thereby ensuring the vibration performance of the vibration motor. Among them, the first magnet 32 is a segmented magnetized one, and the upper and lower magnetic poles on the left and right sides of the first magnet 32 are opposite. The magnetic pole on the left side of the first magnet 32 is the same as the magnetic pole of the second magnet 33 on its left side, and the magnetic pole on the right side of the first magnet 32 is the same as the magnetic pole of the second magnet 33 on its right side. When the current in the coil 21 is vertically downward, through the magnetic field action of the first magnet 32 and the second magnet 33 of the oscillator assembly 3, the coil 21 will generate a driving force to the left. By alternately changing the direction of the current in the coil 21, the coil 21 is energized to generate a left and right reciprocating driving force in the horizontal direction, thereby driving the oscillator assembly 2 equipped with the first magnet 32 and the second magnet 33 to perform horizontal reciprocating motion. At the same time, the magnetic conductive housing 1 plays a role in magnetic field aggregation to prevent magnetic leakage, thereby improving the vibration performance.
[0033] The structure of a super-thin moving magnet type linear vibration motor according to the second embodiment of the present invention is as Figure 5 shown. On the basis of the first embodiment, the mass block 30 and the bracket 31 are integrally provided to simplify the assembly process of the oscillator assembly 3 and improve the stability of the oscillator assembly 3.
[0034] In the embodiment of the present invention, the X direction is the vibration direction of the vibration motor and the short side direction of the coil 21, the Y direction is the long side direction of the coil 21, and the Z direction is the vertical thickness direction of the vibration motor.
[0035] It should be noted that in the description of the present utility model, the orientation or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "left", "horizontal direction", "vertical direction", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.
[0036] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.
Claims
1. An ultra-thin moving magnet type linear vibration motor, characterized in that, It includes a square housing having a receiving space, a stator assembly and an oscillator assembly horizontally spaced apart within the receiving space, and elastic members disposed on the left and right sides of the oscillator assembly to elastically support it within the receiving space; the stator assembly includes a rectangular coil and a flexible circuit board; the oscillator assembly includes a mass block having a square relief through groove, a sheet-shaped bracket fixed to the mass block, and a first magnet and a second magnet horizontally arranged side by side and spaced apart and fixed to the bracket and located within the relief through groove. The coil protrudes and extends into the relief through groove. The first magnet is spaced around the inside of the coil, and the second magnet is spaced on both sides of the coil. The coil is horizontally arranged side by side with the first magnet and the second magnet along its long side within the relief through groove and the spacing between them is equal.
2. The ultra-thin moving magnet type linear vibration motor according to claim 1, characterized in that, The housing includes an upper cover plate, a middle frame connected to the oscillator assembly, and a lower cover plate fixing the stator assembly. The upper cover plate, the middle frame and the lower cover plate enclose to form the receiving space.
3. The ultra-thin moving magnet type linear vibration motor according to claim 2, characterized in that, The flexible circuit board and the coil are fixed on the lower cover plate; the flexible circuit board is located outside the short side of the coil.
4. The ultra-thin moving magnet type linear vibration motor according to claim 3, wherein, The upper cover plate and the lower cover plate are provided with through grooves penetrating their thickness corresponding to the coil; the long side of the coil symmetrically covers the through grooves.
5. The ultra-thin moving magnet type linear vibration motor according to claim 4, wherein The upper surface of the mass block is flush with the upper surface of the bracket; the lower surfaces of the first magnet and the second magnet do not protrude from the lower surface of the mass block.
6. The ultra-thin moving magnet linear vibration motor according to claim 5, wherein There is a gap between the upper surface of the mass block and the inner surface of the upper cover plate, and there is a gap between the lower surface of the mass block and the upper surface of the flexible circuit board; there is a gap between the upper surface of the coil in its thickness direction and the lower surface of the bracket.
7. The ultra-thin moving magnet type linear vibration motor according to claim 6, wherein, The bracket includes a first support portion and a second support portion respectively adapted and fixed to the first magnet and the second magnet. The widths of the first support portion and the second support portion are respectively less than or equal to the widths of the first magnet and the second magnet. The first support portion and the second support portion are located within the relief through groove.
8. The ultra-thin moving magnet type linear vibration motor according to claim 7, wherein, The first magnet is provided as one with segmented magnetization, and the upper and lower magnetic poles on the left and right sides of the first magnet are opposite; the magnetic pole on the left side of the first magnet is the same as the magnetic pole of the second magnet on its left side, and the magnetic pole on the right side of the first magnet is the same as the magnetic pole of the second magnet on its right side.
9. The ultra-thin moving magnet type linear vibration motor according to claim 8, wherein, One end of the elastic member is connected and fixed to the mass block, and the other end is connected and fixed to the inner wall of the middle frame to support the horizontal reciprocating movement of the oscillator assembly.
10. The ultra-thin moving magnet type linear vibration motor according to claim 1, characterized in that The mass block and the bracket are integrally provided.