A linear vibration motor and its implementation method

Abstract

The present invention discloses a linear vibration motor, comprising a lower bracket, an FPC board being provided on the upper surface of the lower bracket, a casing being provided above the lower bracket, a support frame being provided inside the casing, symmetrical first magnets being provided on both sides of the short side of the support frame, symmetrical second magnets being provided on both sides of the long side of the support frame, a positioning frame being provided inside the support frame, a coil being provided on the outer side of the positioning frame, a magnet group sliding inside the positioning frame, and limiting foams being provided on the upper and lower sides of the magnet group respectively; the present invention forms a magnetic spring through the interaction of two first magnets and two second magnets with the magnet group, and the limiting foam provides elastic force for the movement of the magnet group, thereby avoiding failure caused by stress of the solid spring and increasing the service life of the motor.

Description

Technical Field

[0001] The present invention belongs to the technical field of linear vibration motors, and in particular relates to a linear vibration motor and an implementation method thereof. Background Art

[0002] Micro vibration motors are essential components for electronic products such as mobile phones, tablets, and electronic toys, providing tactile feedback to users. As competition in the smartphone market intensifies, phone manufacturers are increasingly focusing on the user's tactile experience. This has led to the emergence of linear vibration motors, which differ from traditional rotor motors.

[0003] Compared with traditional rotor motors, linear motors have great advantages in vibration characteristics, response time, service life and noise, and they can provide multiple vibration modes, providing users with rich, diverse, delicate and realistic tactile feedback.

[0004] Conventional micro linear vibration motor structures use springs to provide vibration restoring force, and the springs can cause fatigue fracture in the motor due to stress problems.

[0005] Therefore, there is an urgent need for a linear vibration motor that can avoid failure caused by spring stress problems. Summary of the Invention

[0006] The present invention aims to provide a linear vibration motor to solve the problems mentioned in the background art. The linear vibration motor provided by the present invention has the characteristic of avoiding failure caused by spring stress.

[0007] Another object of the present invention is to provide a method for implementing a linear vibration motor.

[0008] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a linear vibration motor, comprising a lower bracket, an FPC board being provided on the upper surface of the lower bracket, a housing being provided above the lower bracket, a support frame being provided inside the housing, symmetrical first magnets being provided on both sides of the short side of the support frame, symmetrical second magnets being provided on both sides of the long side of the support frame, a positioning frame being provided inside the support frame, a coil being provided on the outside of the positioning frame, the leads of the coil being welded to the FPC board, a magnetic steel group being slid inside the positioning frame, and limiting foams being provided on the upper and lower sides of the magnetic steel group.

[0009] In order to avoid the magnetic steel group, the FPC board and the support frame are further provided with avoidance grooves corresponding to the limiting foam.

[0010] In order to provide a driving magnetic field for the motor; at the same time, it interacts with the two first magnets and the two second magnets to form a magnetic spring, providing elastic force for the movement of the magnet group, so that the magnet group vibrates reciprocatingly. Furthermore, the magnet group includes two third magnets, and the two third magnets are arranged stacked up and down.

[0011] In order to gather the magnetic field and increase the magnetic induction intensity on the coil side, thereby increasing the driving force; at the same time, the mass of the magnetic steel group can be increased, thereby increasing the vibration sense. Furthermore, a pole piece is provided between the two third magnetic steels.

[0012] In order to avoid the inner fillet of the casing when the support frame and the casing are assembled, and also to provide a glue overflow area for bonding the support frame and the casing, further, bevels are provided on the four edges of the upper surface of the support frame.

[0013] In order to provide a glue overflow area for bonding the support frame and the casing, to ensure that the glue does not overflow to other areas, so that the motor bonding is reliable and the quality is easy to control, a groove is further provided on the upper surface of the support frame.

[0014] In order to limit the assembly of the first magnetic steel and the second magnetic steel and facilitate the rapid positioning and assembly of the first magnetic steel and the second magnetic steel, first magnetic steel limiting grooves are further provided on the two short sides of the support frame, and second magnetic steel limiting grooves are provided on the two long sides of the support frame.

[0015] In order to make the motor vibrate more smoothly, lubricant is further applied on the inner wall of the positioning frame.

[0016] In order to reduce the contact area between the positioning frame and the magnetic steel group, thereby reducing the friction between the magnetic steel group and the positioning frame, the vibration sense can be increased while reducing the heat caused by friction. Furthermore, a plurality of slots are provided on the positioning frame.

[0017] Furthermore, in the present invention, the method for realizing a linear vibration motor comprises the following steps:

[0018] (1) The lower bracket and the housing form a closed cavity;

[0019] (2) The magnetic steel group provides a driving magnetic field for the motor;

[0020] (3) The coil and the FPC board form a circuit. When power is applied, an electric field is generated. The electric field and the magnetic field interact to drive the motor to vibrate.

[0021] (4) The two first magnetic steels and the two second magnetic steels interact with the magnetic steel group to form a magnetic spring, which provides elastic force for the movement of the magnetic steel group, causing the magnetic steel group to vibrate back and forth;

[0022] (5) The two limiting foams not only limit the magnetic field group but also provide elastic force for the movement of the magnetic field group.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. When the coil of the present invention is energized, it generates an electric field, which interacts with the magnetic field generated by the magnetic steel group, driving the magnetic steel group to vibrate up and down. The two first magnetic steels and the two second magnetic steels interact with the magnetic steel group to form a magnetic spring, providing elastic force for the movement of the magnetic steel group, causing the magnetic steel group to vibrate back and forth;

[0025] 2. The limiting foam of the present invention limits the maximum displacement of the magnetic steel group, preventing the magnetic steel group from directly impacting the housing or the lower bracket. At the same time, it also provides elastic force for the movement of the magnetic steel group, causing the magnetic steel group to vibrate back and forth. The provision of the positioning frame of the present invention not only provides an assembly surface for the coil, protects the coil from impact, increases the reliability of the coil, but also provides guidance for the reciprocating vibration of the magnetic steel group.

[0026] 3. The present invention forms a magnetic spring by the interaction of two first magnetic steels and two second magnetic steels with the magnetic steel group, and the limiting foam provides elastic force for the movement of the magnetic steel group, thereby avoiding failure caused by stress of the physical spring and extending the service life of the motor;

[0027] 4. The four edges of the upper surface of the support frame of the present invention are all provided with bevels, which can avoid the inner fillet of the casing when the support frame and the casing are assembled, and also provide an overflow area for the bonding of the support frame and the casing;

[0028] 5. The upper surface of the support frame of the present invention is also provided with a groove, which provides a glue overflow area for bonding the support frame and the housing, ensuring that the glue does not overflow to other areas, making the motor bonding reliable and easy to control quality;

[0029] 6. The present invention limits the assembly of the first magnetic steel and the second magnetic steel through the first magnetic steel limiting groove and the second magnetic steel limiting groove, which facilitates the rapid positioning and assembly of the first magnetic steel and the second magnetic steel;

[0030] 7. The inner wall of the positioning frame of the present invention is coated with lubricant to make the motor vibration smoother;

[0031] 8. The positioning frame of the present invention is provided with a plurality of slots to reduce the contact area between the positioning frame and the magnetic steel group, thereby reducing the friction between the magnetic steel group and the positioning frame, which can increase the vibration sense while reducing the heat caused by friction. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the explosion of the structure of the present invention;

[0033] Figure 2 It is a structural schematic diagram of the present invention;

[0034] Figure 3 For the present invention Figure 2 Schematic diagram of the cross-sectional structure along the AA direction;

[0035] Figure 4For the present invention Figure 2 Schematic diagram of the cross-sectional structure along the BB direction;

[0036] Figure 5 and 6 They are all structural schematic diagrams of the support frame of the present invention;

[0037] Figure 7 Schematic diagram of the structure of the FPC board of the present invention;

[0038] Figure 8 This is a schematic diagram of the electromagnetic drive structure of the present invention;

[0039] In the figure: 1. Casing; 2. Support frame; 21. Bevel; 22. Groove; 23. First magnetic steel limiting groove; 24. Second magnetic steel limiting groove; 25. Positioning frame; 26. Slot; 3. First magnetic steel; 4. Second magnetic steel; 5. Limiting foam; 6. FPC board; 61. Avoidance groove; 7. Lower bracket; 8. Coil; 9. Pole piece; 10. Third magnetic steel. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments 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.

[0041] Example 1

[0042] See also Figure 1-8 The present invention provides the following technical solution: a linear vibration motor, comprising a lower bracket 7, an FPC board 6 is provided on the upper surface of the lower bracket 7, a housing 1 is provided above the lower bracket 7, a support frame 2 is provided inside the housing 1, and symmetrical first magnetic steels 3 are provided on both sides of the short side of the support frame 2, the magnetic poles of the two first magnetic steels 3 are both oriented in the horizontal direction, and the magnetic poles of the two first magnetic steels 3 are in opposite directions, and symmetrical second magnetic steels 4 are provided on both sides of the long side of the support frame 2, the magnetic poles of the two second magnetic steels 4 are both oriented in the horizontal direction, and the two The magnetic pole directions of the second magnetic steel 4 are opposite. The first magnetic steel 3 and the second magnetic steel 4 are respectively bonded to the inner wall of the casing 1. A positioning frame 25 is provided inside the support frame 2, and a coil 8 is provided on the outside of the positioning frame 25. The lead of the coil 8 is welded to the FPC board 6. A magnetic steel group is slid inside the positioning frame 25, and limiting foams 5 are respectively provided on the upper and lower sides of the magnetic steel group. The limiting foams 5 are in a compressed state after being installed in the casing 1. The limiting foams 5 are respectively bonded to the top of the casing 1 and above the lower bracket 7, or respectively bonded to both sides of the magnetic steel group.

[0043] By adopting the above technical solution, when the coil 8 is energized, an electric field is generated, which interacts with the magnetic field generated by the magnetic steel group to drive the magnetic steel group to vibrate up and down. The two first magnetic steels 3 and the two second magnetic steels 4 interact with the magnetic steel group to form a magnetic spring, which provides elastic force for the movement of the magnetic steel group, so that the magnetic steel group vibrates back and forth; the limiting foam 5 limits the maximum displacement of the magnetic steel group to avoid direct collision between the magnetic steel group and the housing 1 or the lower bracket 7, and at the same time, provides elastic force for the movement of the magnetic steel group, so that the magnetic steel group vibrates back and forth; the setting of the positioning frame 25 can not only provide an assembly surface for the coil 8, protect the coil 8, avoid impact, increase the reliability of the coil 8, but also provide guidance for the reciprocating vibration of the magnetic steel group; the two first magnetic steels 3 and the two second magnetic steels 4 interact with the magnetic steel group to form a magnetic spring, and the limiting foam 5 provides elastic force for the movement of the magnetic steel group, thereby avoiding failure caused by stress of the solid spring and increasing the service life of the motor.

[0044] Specifically, the FPC board 6 and the support frame 2 are both provided with an avoidance groove 61 corresponding to the limiting foam 5 .

[0045] By adopting the above technical solution, the magnetic steel group can be avoided.

[0046] Specifically, the magnetic steel group includes two third magnetic steels 10, which are stacked up and down. The magnetic poles of the two third magnetic steels 10 are both oriented in a vertical direction, and the magnetic poles of the two third magnetic steels 10 are in opposite directions.

[0047] By adopting the above technical solution, a driving magnetic field is provided for the motor; at the same time, it interacts with the two first magnetic steels 3 and the two second magnetic steels 4 to form a magnetic spring, providing elastic force for the movement of the magnetic steel group, so that the magnetic steel group vibrates back and forth.

[0048] Specifically, a pole piece 9 is provided between the two third magnetic steels 10 .

[0049] Specifically, the pole piece 9 is a stainless steel magnetic conductive component, which can gather the magnetic field, increase the magnetic induction intensity on the coil side, and thus increase the driving force; at the same time, it can also increase the mass of the magnetic steel group, thereby increasing the vibration sense.

[0050] Example 2

[0051] The difference between this embodiment and the first embodiment is that: specifically, bevels 21 are provided on the four sides of the upper surface of the support frame 2 .

[0052] By adopting the above technical solution, the inner fillet of the casing 1 can be avoided when the support frame 2 and the casing 1 are assembled, and an overflow area is provided for the bonding of the support frame 2 and the casing 1.

[0053] Specifically, a groove 22 is further provided on the upper surface of the support frame 2 .

[0054] By adopting the above technical solution, a glue overflow area is provided for bonding the support frame 2 and the housing 1, ensuring that the glue does not overflow to other areas, making the motor bonding reliable and the quality easy to control.

[0055] Example 3

[0056] The difference between this embodiment and the first embodiment is that: specifically, first magnetic steel limiting grooves 23 are provided on the two short sides of the support frame 2 , and second magnetic steel limiting grooves 24 are provided on the two long sides of the support frame 2 .

[0057] By adopting the above technical solution, the assembly of the first magnetic steel 3 and the second magnetic steel 4 is limited, which facilitates the rapid positioning and assembly of the first magnetic steel 3 and the second magnetic steel 4.

[0058] Example 4

[0059] The difference between this embodiment and the first embodiment is that: specifically, a lubricant is applied on the inner wall of the positioning frame 25, and the lubricant is preferably a lipid lubricant.

[0060] By adopting the above technical solution, the vibration of the motor is made smoother.

[0061] Example 5

[0062] The difference between this embodiment and the first embodiment is that: specifically, a plurality of slots 26 are provided on the positioning frame 25 .

[0063] By adopting the above technical solution, the contact area between the positioning frame 25 and the magnetic steel group is reduced, thereby reducing the friction between the magnetic steel group and the positioning frame 25, which can increase the vibration feeling while reducing the heat caused by friction.

[0064] Example 6

[0065] Furthermore, the method for implementing a linear vibration motor according to the present invention comprises the following steps:

[0066] (1) The lower bracket 7 and the housing 1 form a closed cavity;

[0067] (2) The magnetic steel group provides a driving magnetic field for the motor;

[0068] (3) The coil 8 and the FPC board 6 form a circuit. When energized, an electric field is generated. The electric field and the magnetic field interact to drive the motor to vibrate;

[0069] (4) The two first magnetic steels 3 and the two second magnetic steels 4 interact with the magnetic steel group to form a magnetic spring, providing elastic force for the movement of the magnetic steel group, causing the magnetic steel group to vibrate back and forth;

[0070] (5) The two limiting foams 5 not only limit the magnetic field group but also provide elastic force for the movement of the magnetic field group.

[0071] In summary, when the coil 8 of the present invention is energized, an electric field is generated, which interacts with the magnetic field generated by the magnetic steel group to drive the magnetic steel group to vibrate up and down. The two first magnetic steels 3 and the two second magnetic steels 4 interact with the magnetic steel group to form a magnetic spring, which provides elastic force for the movement of the magnetic steel group, so that the magnetic steel group vibrates back and forth; the limiting foam 5 of the present invention limits the maximum displacement of the magnetic steel group, avoids direct collision between the magnetic steel group and the housing 1 or the lower bracket 7, and at the same time, provides elastic force for the movement of the magnetic steel group, so that the magnetic steel group vibrates back and forth; the setting of the positioning frame 25 of the present invention can provide an assembly surface for the coil 8, protect the coil 8, avoid collision, increase the reliability of the coil 8, and provide guidance for the reciprocating vibration of the magnetic steel group; the present invention forms a magnetic spring by the interaction of the two first magnetic steels 3 and the two second magnetic steels 4 with the magnetic steel group, and the limiting foam 5 provides elastic force for the movement of the magnetic steel group, thereby avoiding failure caused by stress of the physical spring and increasing the service life of the motor; the present invention supports The four edges of the upper surface of the support frame 2 are provided with bevels 21, which can avoid the inner fillet of the casing 1 when the support frame 2 is assembled with the casing 1, and also provide a glue overflow area for the bonding of the support frame 2 and the casing 1; the upper surface of the support frame 2 of the present invention is also provided with a groove 22, which provides a glue overflow area for the bonding of the support frame 2 and the casing 1, ensuring that the glue does not overflow to other areas, so that the motor bonding is reliable and the quality is easy to control; the present invention limits the assembly of the first magnetic steel 3 and the second magnetic steel 4 through the first magnetic steel limiting groove 23 and the second magnetic steel limiting groove 24, which is convenient for the rapid positioning and assembly of the first magnetic steel 3 and the second magnetic steel 4; the inner wall of the positioning frame 25 of the present invention is coated with lubricant, so that the motor vibration is smoother; the positioning frame 25 of the present invention is provided with a plurality of slots 26, which reduce the contact area between the positioning frame 25 and the magnetic steel group, thereby reducing the friction between the magnetic steel group and the positioning frame 25, which can increase the vibration sense while reducing the heat caused by friction.

[0072] While embodiments of the present invention have been shown and described, it will be appreciated 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 invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A linear vibration motor, comprising a lower bracket, characterized in that: An FPC board is provided on the upper surface of the lower bracket, a housing is provided above the lower bracket, a support frame is provided inside the housing, symmetrical first magnetic steels are provided on both sides of the short side of the support frame, and symmetrical second magnetic steels are provided on both sides of the long side of the support frame, a positioning frame is provided inside the support frame, a coil is provided on the outside of the positioning frame, the lead of the coil is welded to the FPC board, a magnetic steel group is slid inside the positioning frame, and limiting foams are provided on the upper and lower sides of the magnetic steel group, which are in a compressed state after being installed in the housing; The four edges of the upper surface of the support frame are beveled to avoid the inner corners of the casing when the support frame and the casing are assembled. At the same time, it also provides an overflow area for the glue to be bonded to the casing. The upper surface of the support frame is also provided with a groove to provide an overflow area for the glue to be bonded to the casing, ensuring that the glue does not overflow to other areas, making the motor bonding reliable and easy to control quality. A first magnetic steel limiting groove is provided on the two short sides of the support frame, and a second magnetic steel limiting groove is provided on the two long sides of the support frame, which limits the assembly of the first magnetic steel and the second magnetic steel, facilitating the rapid positioning and assembly of the first magnetic steel and the second magnetic steel.

2. The linear vibration motor according to claim 1, wherein: The FPC board and the support frame are both provided with avoidance grooves corresponding to the limiting foam.

3. The linear vibration motor according to claim 1, wherein: The magnetic steel group includes two third magnetic steels, and the two third magnetic steels are stacked up and down.

4. The linear vibration motor according to claim 3, wherein: A pole piece is provided between the two third magnetic steels.

5. The linear vibration motor according to claim 1, wherein: The inner wall of the positioning frame is coated with lubricant.

6. The linear vibration motor according to claim 1, wherein: The positioning frame is provided with a plurality of slots.

7. A method for implementing a linear vibration motor according to any one of claims 1 to 6, characterized in that: The following steps are involved: (1) The lower bracket and the housing form a closed cavity; (2) The magnetic steel group provides a driving magnetic field for the motor; (3) The coil and the FPC board form a circuit. When power is applied, an electric field is generated. The electric field and the magnetic field interact to drive the motor to vibrate. (4) The two first magnetic steels and the two second magnetic steels interact with the magnetic steel group to form a magnetic spring, which provides elastic force for the movement of the magnetic steel group, causing the magnetic steel group to vibrate back and forth; (5) The two limiting foams not only limit the magnetic field group but also provide elastic force for the movement of the magnetic field group.

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