Horizontal linear vibration motor

Abstract

The utility model relates to the technical field of vibration motors, and discloses a horizontal linear vibration motor, which comprises a shell with an accommodating space, a vibrator assembly and a stator assembly, the vibrator assembly and the stator assembly are vertically accommodated in the accommodating space at intervals, and the shell comprises a cover plate fixed with the stator assembly and an upper shell fixed with the vibrator assembly. An accommodating space is defined by the upper shell and the cover plate; the vibrator assembly comprises a cuboid mass block with a mounting groove, and a magnetic steel assembly fixed on the mass block and embedded in the mounting groove; the stator assembly comprises first auxiliary magnetic steel fixed on the cover plate and a coil arranged around the first auxiliary magnetic steel; second auxiliary magnetic steel is fixedly arranged at the position, corresponding to the first auxiliary magnetic steel, of the upper shell. The magnetic steel assembly comprises a first magnetic steel and a second magnetic steel which are arranged in parallel left and right, and a third magnetic steel and a fourth magnetic steel which are clamped between the first magnetic steel and the second magnetic steel and are stacked up and down corresponding to the position of the first auxiliary magnetic steel. The six-magnetic-steel structure of the vibration motor not only effectively reduces the stress of the elastic piece, but also has stronger vibration sense.

Description

Technical Field

[0001] The utility model relates to the technical field of vibration motors, in particular to a horizontal linear vibration motor. Background Art

[0002] With the advancement of electronic technology, portable consumer electronics, such as mobile phones, handheld game consoles, and multimedia entertainment devices, have gradually taken over the global consumer market. These electronic products generally use vibration motors for tactile feedback, such as incoming call notifications on mobile phones and vibration feedback on game consoles. To meet such a wide range of applications, the vibration performance requirements for vibration motors are becoming increasingly stringent.

[0003] Existing vibration motors, such as the utility model patent application with patent application number: 202120870311.9, disclose a linear vibration motor, comprising a magnetically conductive housing having an accommodating space and a vibrator assembly and a stator assembly accommodated in the accommodating space, wherein the stator assembly comprises an iron core fixed to the cover plate, a coil arranged around the iron core, and a flexible circuit board electrically connecting the coil to an external circuit, the vibrator assembly comprises a mass block and a magnetic steel assembly fixed to the mass block to form a Halbach array, and an elastic member supporting the mass block in the accommodating space, one end of the elastic member is fixed to the mass block and the other end is fixed to the upper shell to drive the mass block to vibrate reciprocatingly, the magnetic steel assembly comprises a first magnetic steel group arranged opposite to the iron core and a second magnetic steel and a third magnetic steel located on both sides of the first magnetic steel, the first magnetic steel group comprises two stacked first magnetic steels, the magnetization directions of the two first magnetic steels are opposite and both are parallel to the vibration direction, the magnetization directions of the second magnetic steel and the third magnetic steel are opposite and both are parallel to the thickness direction of the coil, and the upper shell is made of a magnetic conductive material. Although the linear vibration motor of the present invention achieves strong magnetic field performance, as the vibration amount increases, the foam or other elastic colloid on both sides of the mass block and the elastic part come into contact during the vibration of the vibration motor, which in turn increases the concentrated stress of the elastic part and affects the life of the motor. Utility Model Content

[0004] The purpose of this utility model is to provide a horizontal linear vibration motor with a stronger vibration feeling and capable of effectively reducing the stress of the elastic member. The specific technical solution is as follows:

[0005] A horizontal linear vibration motor comprises a shell having an accommodating space and a vibrator assembly and a stator assembly accommodated in the accommodating space with upper and lower intervals, the shell comprising a cover plate fixed to the stator assembly and an upper shell fixed to the vibrator assembly, the upper shell and the cover plate enclosing the accommodating space; the vibrator assembly comprises a rectangular parallelepiped mass block having a mounting slot, a magnetic steel assembly fixed to the mass block and embedded in the mounting slot, and an elastic member supporting the mass block in the accommodating space, one end of the elastic member being fixed to the mass block and the other end being fixed to the upper shell to drive the mass block to vibrate reciprocatingly; the stator assembly comprises a first auxiliary magnetic steel fixed to the cover plate, a coil arranged around the first auxiliary magnetic steel, and a flexible circuit board electrically connecting the coil to an external circuit; a second auxiliary magnetic steel is fixedly arranged on the upper shell at a position corresponding to the first auxiliary magnetic steel; the magnetic steel assembly comprises a first magnetic steel and a second magnetic steel arranged parallel to each other on the left and right, and a third magnetic steel and a fourth magnetic steel sandwiched between the first and second magnetic steels and stacked up and down corresponding to the position of the first auxiliary magnetic steel.

[0006] Preferably, the magnetization directions of the first magnetic steel and the second magnetic steel are opposite; the magnetization directions of the first auxiliary magnetic steel and the second auxiliary magnetic steel are opposite and both are perpendicular to the magnetization directions of the first magnetic steel and the second magnetic steel; the magnetization directions of the third magnetic steel and the fourth magnetic steel are opposite and both are perpendicular to the magnetization directions of the first magnetic steel and the second magnetic steel; the magnetization directions of the third magnetic steel and the second auxiliary magnetic steel are opposite, and the magnetization direction of the fourth magnetic steel is opposite to that of the first auxiliary magnetic steel.

[0007] Preferably, a first clearance groove running through the width direction of the mass block is provided on the lower surface facing the coil; a second clearance groove is provided on the upper surface of the mass block facing the second magnetic steel; an installation groove for installing the magnetic steel assembly is provided between the first clearance groove and the second clearance groove; the first clearance groove, the second clearance groove and the installation groove are all square and their center lines coincide in the thickness direction of the mass block; the width and horizontal cross-sectional area of the first clearance groove are both greater than the width and horizontal cross-sectional area of the installation groove, and the width and horizontal cross-sectional area of the installation groove are greater than the width and horizontal cross-sectional area of the second clearance groove.

[0008] Preferably, the first magnetic steel, the second magnetic steel, the third magnetic steel, the fourth magnetic steel, the first auxiliary magnetic steel and the second auxiliary magnetic steel are all in the shape of long strips and are arranged along the length direction of the mass block.

[0009] Preferably, the first auxiliary magnetic steel and the second auxiliary magnetic steel correspond to the fourth magnetic steel and the third magnetic steel respectively in the vibration direction and are spaced apart.

[0010] Preferably, the second auxiliary magnetic steel protrudes into the second clearance groove in the thickness direction of the mass block; the length and width of the second auxiliary magnetic steel are both smaller than the width of the second clearance groove.

[0011] Preferably, the coil protrudes into the first clearance groove; the coil corresponds to the first magnetic steel and the second magnetic steel respectively and is arranged at intervals along the vibration direction, and the upper surface of the coil is higher than or equal to the upper surface of the first auxiliary magnetic steel.

[0012] Preferably, the upper shell and the cover plate are both made of magnetic conductive material.

[0013] Preferably, the elastic member is located on both sides of the long side of the mass block, and a buffer member is provided between the elastic member and the mass block.

[0014] Preferably, the vibrator assembly further includes a support plate located between the mounting groove and the second clearance groove and covering the second clearance groove, and a partition adapted to be arranged between the first magnetic steel, the second magnetic steel, the third magnetic steel and the fourth magnetic steel.

[0015] Compared with the existing technology, the horizontal linear vibration motor of the utility model has a higher vibration amount and can effectively reduce the stress of the elastic parts, avoiding the defect of short service life caused by the fatigue of traditional elastic parts and other problems, and improving the vibration performance and reliability of the vibration motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an exploded view of the structure of the horizontal linear vibration motor according to the first embodiment.

[0017] Figure 2 1 is a Y-axis cross-sectional view and a magnetic field direction schematic diagram of the horizontal linear vibration motor according to the first embodiment.

[0018] Figure 3 It is an exploded view of the structure of the vibrator assembly of the second embodiment.

[0019] Figure 4 A Y-axis cross-sectional view of the horizontal linear vibration motor of the second embodiment

[0020] Figure 5 Schematic diagram of the magnetic lines of force of the six magnets, the coil, the upper shell and the cover plate when the vibrator assembly is in motion in the second embodiment.

[0021] in:

[0022] 1- upper shell;

[0023] 2- Cover plate:

[0024] 3-vibrator assembly; 30-mass block; 31-first magnetic steel; 32-second magnetic steel; 33-third magnetic steel;

[0025] 34 - fourth magnetic steel; 35 - elastic member; 36 - buffer member; 300 - first clearance slot; 301 - mounting slot;

[0026] 302-second clearance slot; 303-support plate; 304-partition plate;

[0027] 4-stator assembly; 40-flexible circuit board; 41-coil;

[0028] 5-first auxiliary magnetic steel; 6-second auxiliary magnetic steel. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] The structure of a horizontal linear vibration motor in the first embodiment of the utility model is as follows Figure 1 and Figure 2 As shown, it includes a shell (not marked) having an accommodating space (not marked) and a vibrator assembly 3 and a stator assembly 4 accommodated in the accommodating space with upper and lower intervals. The shell includes a cover plate 2 fixed to the stator assembly 4 and an upper shell 1 fixed to the vibrator assembly 3. The upper shell 1 and the cover plate 2 are buckled together to form an accommodating space. In this embodiment, the upper shell 1 and the cover plate 21 are both made of magnetic conductive material, which helps to guide the magnetic field, reduce the loss of the magnetic field in the vibration motor, and improve efficiency and performance; wherein, in the vibration motor structure of the present invention, the X direction is the horizontal length direction, the Y direction is the horizontal width direction of the vibration direction and the vibration direction, and the Z direction is the vertical height direction. The side facing the shell is set to the top, and the side facing the cover plate is set to the bottom.

[0031] The stator assembly 4 includes a first auxiliary magnet 5 fixed to the cover plate 2, a coil 41 arranged around the first auxiliary magnet 5, and a flexible circuit board 40 electrically connecting the coil 41 to an external circuit; the upper surface of the coil 41 is higher than or equal to the upper surface of the first auxiliary magnet 6 to ensure that the mass block 30 of the vibrator assembly 3 does not collide with the coil 41 or the second auxiliary magnet 6 during the reciprocating motion; the second auxiliary magnet 6 is fixedly provided on the upper shell 1 at the position corresponding to the first auxiliary magnet 5.

[0032] The vibrator assembly 3 includes a rectangular mass block 30 having a mounting groove 301, a magnetic steel assembly (not marked) fixed to the mass block 30 and embedded in the mounting groove 301, and a V-shaped elastic member 35 that supports the mass block 30 in the accommodating space. The elastic member 35 is located on both sides of the long side of the mass block 30. One end of the elastic member 35 is fixed to the mass block 30 and the other end is fixed to the upper shell 1 to drive the mass block 30 to reciprocate in its width direction, thereby causing the vibrator assembly 3 to generate a vibration sense; in this embodiment, a buffer member 36 is provided between the elastic member 35 and the mass block 30. The buffer member 36 is fixed on the mass block 32. The shapes of the two sides of the buffer member 36 are respectively adapted to the elastic member 35 and the mass block 30 to avoid the elastic member 35 and the mass block 30 from colliding and generating noise during vibration. The buffer member 36 is foam or rubber.

[0033] The lower surface of the mass block 30 facing the coil 41 is provided with a first clearance groove 300 running through the width direction thereof, the length of the coil 41 is less than the length of the first clearance groove 300, and the coil 41 protrudes into the first clearance groove 300 to avoid the mass block 30 and the coil 41 from colliding and generating noise during the reciprocating motion of the vibrator assembly 3, and at the same time, optimize the utilization rate of the thickness space of the vibration motor; the upper surface of the mass block 30 facing the second magnetic steel 6 is provided with a second clearance groove 302, the length and width of the second auxiliary magnetic steel 6 are both less than the width of the second clearance groove 302, and the second auxiliary magnetic steel 6 protrudes into the second clearance groove 302 in the thickness direction of the mass block 30 to avoid the mass block 30 and the second auxiliary magnetic steel 6 from colliding and generating noise during the reciprocating motion of the vibrator assembly 3, and at the same time, optimize the utilization rate of the thickness space of the vibration motor; , optimizing the utilization rate of the thickness space of the vibration motor; an installation slot 301 for installing the magnetic steel assembly is connected between the first clearance slot 300 and the second clearance slot 302; the first clearance slot 300, the installation slot 301 and the second clearance slot 302 are all square and their center lines coincide in the thickness direction of the mass block 30, thereby ensuring the symmetry and stability of the vibrator assembly 3; the width and horizontal cross-sectional area of the first clearance slot 300 are both greater than the width and horizontal cross-sectional area of the installation slot 301, meeting the circumferential limitation of the magnetic steel assembly in the mass block 30, and the width and horizontal cross-sectional area of the installation slot 301 are greater than the width and horizontal cross-sectional area of the second clearance slot 302, so that the installation slot 301 and the second clearance slot 302 form a step, meeting the limitation of the magnetic steel assembly in the thickness direction of the mass block 30.

[0034] The magnetic field direction diagram of the horizontal linear vibration motor of the utility model is as follows Figure 2As shown, the magnetic steel assembly includes a first magnetic steel 31 and a second magnetic steel 32 arranged in parallel along the width direction, and a third magnetic steel 33 and a fourth magnetic steel 34 clamped between the first magnetic steel 31 and the second magnetic steel 32 and stacked up and down corresponding to the position of the first auxiliary magnetic steel 5; the first magnetic steel 31, the second magnetic steel 32, the third magnetic steel 33, the fourth magnetic steel 34, the first auxiliary magnetic steel 5 and the second auxiliary magnetic steel 6 are all long strips and arranged along the length direction of the mass block, that is, there is a gap between the first auxiliary magnetic steel 5 and the fourth magnetic steel 34 and between the second auxiliary magnetic steel 6 and the third magnetic steel 33 to ensure that the vibrator assembly 3 does not collide with the first auxiliary magnetic steel 5 and the second auxiliary magnetic steel 6 during the reciprocating motion; wherein, the coil 41 corresponds to the first magnetic steel 31 and the second magnetic steel 32 in the vibration direction and is arranged at intervals, and the first auxiliary magnetic steel 5 and the fourth magnetic steel 34 are arranged in a long strip shape. The two auxiliary magnetic steels 6 correspond to the fourth magnetic steel 34 and the third magnetic steel 33 respectively in the upper and lower directions of the vibration direction and are arranged at intervals; the magnetization directions of the first magnetic steel 31 and the second magnetic steel 32 are opposite; the magnetization directions of the first auxiliary magnetic steel 5 and the second auxiliary magnetic steel 6 are opposite and both are perpendicular to the magnetization directions of the first magnetic steel 31 and the second magnetic steel 32; the magnetization directions of the third magnetic steel 33 and the fourth magnetic steel 34 are opposite and both are perpendicular to the magnetization directions of the first magnetic steel 31 and the second magnetic steel 32; the magnetization directions of the third magnetic steel 33 and the second auxiliary magnetic steel 6 are opposite, and the magnetization directions of the fourth magnetic steel 34 and the first auxiliary magnetic steel 5 are opposite. Therefore, the magnetic steel assembly forms a Halbach array with the first auxiliary magnetic steel 5 and the second auxiliary magnetic steel 6 respectively, which not only enhances the magnetic field of the vibration motor, but also makes the difference in the upper and lower suction forces of the vibrator assembly 3 much smaller, more balanced, and with better vibration performance.

[0035] The structure of a horizontal linear vibration motor in the second embodiment of the utility model is as follows Figures 3 to 5 As shown, on the basis of the first embodiment, the vibrator assembly 3 also includes a support plate 303 located between the installation groove 301 and the second make way groove 302 and covering the second make way groove 302, and a partition plate 304 adapted to be arranged between the first magnetic steel 31, the second magnetic steel 32, the third magnetic steel 33 and the fourth magnetic steel 34. The support plate 303 and the partition plate 304 are both made of insulating materials, which facilitates the fixation of the magnetic steel assembly in the mass block 30 without affecting the magnetic field.

[0036] The horizontal linear vibration motor of the utility model generates an auxiliary magnetic field through the first auxiliary magnetic steel 5 and the second auxiliary magnetic steel 6, which not only enhances the driving force, but also provides a positive spring effect to reduce the stress of the elastic member 36. Figure 5As shown, according to the distribution of magnetic lines of force and magnetic poles, when the vibrator assembly 3 deviates from the equilibrium position and moves to the right, the horizontal suction force on the vibrator assembly 3 as a whole is to the left, and at this time, the rebound force generated by the elastic member 36 due to deformation is also to the left, that is, the suction force on the vibrator assembly and the rebound force of the elastic member 36 are in the same direction, forming the effect of a positive spring. When the suction force on the vibrator assembly 3 and the elastic member 36 act at the same time, the spring coefficient of the rebound force generated by the elastic member 36 under unit deformation is increased. At this time, the mechanical spring coefficient of the elastic member 36 itself is reduced. In the horizontal linear vibration motor of the present invention, the stress of the elastic member 36 is proportional to the mechanical spring coefficient of the elastic member 36, that is, when the mechanical spring coefficient of the elastic member 36 is reduced, the stress of the elastic member 36 is reduced, thereby avoiding the problem of short service life of the elastic member 36 due to deformation fatigue and other problems, ensuring the stable performance of the vibration motor system and improving reliability.

[0037] It should be noted that, in the description of the present invention, the terms "up", "down", "front", "back", "left", "horizontal direction", "vertical direction", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as a limitation on the present invention.

[0038] Although the 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 variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A horizontal linear vibration motor, comprising a housing having an accommodating space, and a vibrator assembly and a stator assembly accommodated in the accommodating space with upper and lower intervals, the housing comprising a cover plate fixed to the stator assembly and an upper shell fixed to the vibrator assembly, the upper shell and the cover plate enclosing and forming the accommodating space; the vibrator assembly comprising a rectangular parallelepiped mass block having a mounting slot, a magnetic steel assembly fixed to the mass block and embedded in the mounting slot, and an elastic member supporting the mass block in the accommodating space, the elastic member having one end fixed to the mass block and the other end fixed to the upper shell to drive the mass block to reciprocate; characterized in that: The stator assembly includes a first auxiliary magnet fixed to the cover plate, a coil arranged around the first auxiliary magnet, and a flexible circuit board electrically connecting the coil to an external circuit; the second auxiliary magnet is fixedly arranged on the upper shell at a position corresponding to the first auxiliary magnet; the magnet assembly includes a first magnet and a second magnet arranged in parallel on the left and right, and a third magnet and a fourth magnet clamped between the first magnet and the second magnet and stacked up and down corresponding to the position of the first auxiliary magnet.

2. The horizontal linear vibration motor according to claim 1, characterized in that: The magnetization directions of the first magnetic steel and the second magnetic steel are opposite; the magnetization directions of the first auxiliary magnetic steel and the second auxiliary magnetic steel are opposite and both are perpendicular to the magnetization directions of the first magnetic steel and the second magnetic steel; the magnetization directions of the third magnetic steel and the fourth magnetic steel are opposite and both are perpendicular to the magnetization directions of the first magnetic steel and the second magnetic steel; the magnetization directions of the third magnetic steel and the second auxiliary magnetic steel are opposite, and the magnetization direction of the fourth magnetic steel is opposite to that of the first auxiliary magnetic steel.

3. The horizontal linear vibration motor according to claim 2, characterized in that: A first clearance groove running through the width direction of the mass block is provided on the lower surface of the mass block facing the coil; a second clearance groove is provided on the upper surface of the mass block facing the second magnetic steel; a mounting groove for mounting the magnetic steel assembly is connected between the first clearance groove and the second clearance groove; the first clearance groove, the second clearance groove and the mounting groove are all square and their center lines coincide in the thickness direction of the mass block; the width and horizontal cross-sectional area of the first clearance groove are both greater than the width and horizontal cross-sectional area of the mounting groove, and the width and horizontal cross-sectional area of the mounting groove are greater than the width and horizontal cross-sectional area of the second clearance groove.

4. The horizontal linear vibration motor according to claim 3, characterized in that: The first magnetic steel, the second magnetic steel, the third magnetic steel, the fourth magnetic steel, the first auxiliary magnetic steel and the second auxiliary magnetic steel are all in the shape of long strips and are arranged along the length direction of the mass block.

5. The horizontal linear vibration motor according to claim 4, characterized in that: The first auxiliary magnetic steel and the second auxiliary magnetic steel correspond to the fourth magnetic steel and the third magnetic steel respectively in the vibration direction and are spaced apart.

6. The horizontal linear vibration motor according to claim 5, characterized in that: The second auxiliary magnetic steel protrudes into the second paving groove in the thickness direction of the mass block; the length and width of the second auxiliary magnetic steel are both smaller than the width of the second paving groove.

7. The horizontal linear vibration motor according to claim 6, characterized in that: The coil protrudes from the first clearance groove; the coil corresponds to the first magnetic steel and the second magnetic steel respectively and is arranged at intervals along the vibration direction, and the upper surface of the coil is higher than or equal to the upper surface of the first auxiliary magnetic steel.

8. The horizontal linear vibration motor according to claim 7, characterized in that: The upper shell and the cover plate are both made of magnetic conductive material.

9. The horizontal linear vibration motor according to claim 8, characterized in that: The elastic member is located on both sides of the long side of the mass block, and a buffer member is provided between the elastic member and the mass block.

10. The horizontal linear vibration motor according to claim 4, characterized in that: The vibrator assembly further includes a support plate located between the mounting slot and the second clearance slot and covering the second clearance slot, and a partition plate adapted to be arranged between the first magnetic steel, the second magnetic steel, the third magnetic steel and the fourth magnetic steel.

Images