Cylindrical vibration motor

Abstract

The utility model discloses a cylindrical vibration motor, which comprises a casing, an FPC (flexible printed circuit) board connected outside the casing, a damping ring adhered to the inner wall of the casing, the damping ring made of conductive materials, two symmetrically arranged coils adhered to the inner wall of the damping ring, a magnetic steel component arranged inside the damping ring, springs adhered to two ends of the magnetic steel component respectively, and an elastic element arranged in the magnetic steel component. The outer ring of the spring is bonded with the inner wall of the casing, and two ends of the casing are respectively welded with a cover plate. Damping is provided through the damping ring, in the vibration process of the motor, a magnetic field cuts the damping ring, so that eddy current is generated on the damping ring, the damping effect on the motor is generated, and compared with magnetic liquid, damping glue or foam and the like in the prior art, the damping ring has the advantages of being reliable in stability, prolonging the service life and guaranteeing the vibration effect.

Description

Technical Field

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

[0002] Vibration motors are essential components in electronic products such as mobile phones, tablets, and handheld game consoles, providing tactile feedback to users. Currently, mobile consumer electronics products on the market generally use vibration motors as system feedback components, such as incoming call notifications on mobile phones and vibration feedback on game consoles.

[0003] Compared with traditional rotor motors, linear motors have great advantages in vibration characteristics, response time, service life, noise, etc. In order to achieve the vibration effect of rapid start and stop, current linear motors often use magnetic fluid, foam, or damping glue to increase the damping of the motor system to achieve the effect of rapid start and stop.

[0004] However, the magnetic fluid, damping glue or foam in existing solutions are not very stable and are prone to aging during use, resulting in noise in the motor and poor touch in the later stage. Utility Model Content

[0005] The purpose of the present invention is to provide a cylindrical vibration motor to solve the problems mentioned in the above background technology. The cylindrical vibration motor provided by the present invention has the characteristics of stable and reliable damping and good vibration effect.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a cylindrical vibration motor, comprising a casing, an FPC board connected to the outside of the casing, a damping ring bonded to the inner wall of the casing, the damping ring being made of a conductive material, two symmetrically arranged coils bonded to the inner wall of the damping ring, a magnetic steel assembly being further provided inside the damping ring, springs being bonded to both ends of the magnetic steel assembly, the outer ring of the spring being bonded to the inner wall of the casing, and cover plates being welded to both ends of the casing.

[0007] In order to make the motor itself have sufficiently large electromagnetic damping, the magnetic steel assembly further includes a second magnetic steel, wherein the first magnetic steel is respectively provided at both ends of the second magnetic steel, and the magnetic poles of the second magnetic steel and the first magnetic steel are arranged to repel each other.

[0008] In order to gather the magnetic field, increase the magnetic induction intensity, and thus increase the driving force, a pole piece is further provided between the second magnetic steel and the first magnetic steel.

[0009] In order to locate the relative positions of the first magnetic steel, the pole piece and the second magnetic steel and ensure concentricity, the magnetic steel assembly further includes a shaft, which passes through the first magnetic steel, the pole piece and the second magnetic steel respectively.

[0010] In order to avoid the traditional laser welding fixing method of metal springs, thereby avoiding the poor reliability and life due to burns caused by laser welding, the spring is further made of plastic.

[0011] In order to ensure the stability and reliability of the bonding between the spring and the housing, a plurality of glue overflow grooves are further provided on the circumference of the spring.

[0012] In order to ensure the stability and reliability of the bonding between the shaft and the spring, a bonding seat is further provided on the end surface of the spring.

[0013] In order to facilitate the wiring of the coil and connect the leads of the coil to the FPC board, corresponding notches are further provided on the FPC board, the housing and the damping ring.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. The utility model provides damping through the damping ring. During the vibration of the motor, the magnetic field cuts the damping ring, thereby generating eddy currents on the damping ring, thereby producing a damping effect on the motor. Compared with magnetic fluid, damping glue or foam in the prior art, the utility model has the characteristics of stability and reliability, thereby increasing the service life and ensuring the vibration effect;

[0016] 2. The magnetic steel assembly of the utility model includes a second magnetic steel, wherein the first magnetic steel is provided at both ends of the second magnetic steel, and the magnetic poles of the second magnetic steel and the first magnetic steel are arranged to repel each other. Most of the space in the housing is occupied by the magnetic steel assembly, which can effectively increase the driving force. The magnetic pole repulsion arrangement also makes the back electromotive force very large, so that the motor itself has sufficiently large electromagnetic damping;

[0017] 3. The magnetic steel assembly of the present invention further includes a shaft, which passes through the first magnetic steel, the pole piece and the second magnetic steel respectively, and is used to locate the relative positions of the first magnetic steel, the pole piece and the second magnetic steel to ensure concentricity;

[0018] 4. The spring of the utility model is made of plastic, so the connection between the spring and the housing is glue bonding, which can completely avoid the laser welding fixation method of traditional metal springs, and also avoid the poor reliability and life caused by burns caused by laser welding;

[0019] 5. The utility model has a simple structure and is easy to manufacture. The first magnet, pole piece, second magnet, shaft and spring can all be self-positioned by the materials, which greatly reduces the requirements for assembly tooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the explosion structure of the utility model;

[0021] Figure 2 This is a schematic cross-sectional view of the utility model;

[0022] Figure 3 This is a schematic structural diagram of the spring of the utility model;

[0023] Figure 4 Schematic diagram of the magnetic pole distribution of the magnetic steel assembly of the present invention;

[0024] In the figure: 1. Housing; 2. FPC board; 3. Cover; 4. Magnet assembly; 41. First magnet; 42. Pole piece; 43. Second magnet; 44. Shaft; 5. Damping ring; 6. Coil; 7. Spring; 71. Glue overflow groove; 72. Adhesive seat; 8. Notch. DETAILED DESCRIPTION

[0025] 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.

[0026] Example 1

[0027] See also Figure 1-4 The utility model provides the following technical solutions: a cylindrical vibration motor, including a casing 1. In this embodiment, the casing 1 is preferably made of a magnetic conductive material, which increases the magnetic field B value passing through the damping ring 5, thereby increasing the electromagnetic damping effect. The outside of the casing 1 is connected to an FPC board 2, and a damping ring 5 is bonded to the inner wall of the casing 1. The damping ring 5 is made of a material with high conductivity, and in this embodiment, it is preferably copper. Two symmetrically arranged coils 6 are bonded to the inner wall of the damping ring 5, and the leads of the two coils 6 are connected in series and then connected to the FPC board 2. A magnetic steel component 4 is also provided inside the damping ring 5, and springs 7 are respectively bonded to both ends of the magnetic steel component 4. The outer ring of the spring 7 is bonded to the inner wall of the casing 1, and cover plates 3 are respectively welded to both ends of the casing 1.

[0028] By adopting the above technical solution, the utility model provides damping through the damping ring 5. During the vibration of the motor, the magnetic field cuts the damping ring 5, thereby generating eddy currents on the damping ring 5, thereby producing a damping effect on the motor. Compared with magnetic fluid, damping glue or foam in the prior art, the utility model has the characteristics of stable and reliable performance, thereby increasing the service life and ensuring the vibration effect.

[0029] Specifically, the magnetic steel assembly 4 includes a second magnetic steel 43 , wherein the first magnetic steel 41 is respectively provided at both ends of the second magnetic steel 43 , and the magnetic poles of the second magnetic steel 43 and the first magnetic steel 41 are arranged to repel each other.

[0030] By adopting the above technical solution, most of the space in the casing 1 is the magnetic steel assembly 4, which can effectively increase the driving force. The magnetic pole repulsion setting makes the reverse electromotive force very large, so that the motor itself has sufficiently large electromagnetic damping.

[0031] Specifically, a pole piece 42 is provided between the second magnetic steel 43 and the first magnetic steel 41 .

[0032] By adopting the above technical solution, the magnetic field can be gathered, the magnetic induction intensity can be increased, and thus the driving force can be increased.

[0033] Example 2

[0034] The difference between this embodiment and embodiment 1 is that: specifically, the magnetic steel assembly 4 also includes a shaft 44, which passes through the first magnetic steel 41, the pole piece 42 and the second magnetic steel 43 respectively, and the first magnetic steel 41, the pole piece 42 and the second magnetic steel 43 are bonded to each other by glue, and then bonded to the shaft 44 by glue.

[0035] By adopting the above technical solution, the relative positions of the first magnetic steel 41, the pole piece 42 and the second magnetic steel 43 are positioned to ensure concentricity.

[0036] Example 3

[0037] The difference between this embodiment and embodiment 1 is that: specifically, the spring 7 is made of plastic.

[0038] By adopting the above technical solution, the spring 7 and the housing 1 are connected by glue bonding, which can completely avoid the traditional laser welding fixing method of the metal spring, and also avoid the poor reliability life caused by burns caused by laser welding.

[0039] Specifically, six glue overflow grooves 71 are provided on the circumference of the spring 7 .

[0040] By adopting the above technical solution, the stability and reliability of the bonding between the spring 7 and the housing 1 are guaranteed.

[0041] Specifically, an adhesive seat 72 is provided on the end surface of the spring 7 .

[0042] By adopting the above technical solution, the stability and reliability of the bonding between the shaft 44 and the spring 7 are guaranteed.

[0043] Example 4

[0044] The difference between this embodiment and the first embodiment is that, specifically, corresponding notches 8 are respectively provided on the FPC board 2 , the housing 1 and the damping ring 5 , wherein two symmetrical notches 8 are respectively provided on the housing 1 and the damping ring 5 .

[0045] By adopting the above technical solution, the coil 6 is routed, which facilitates the connection of the leads of the coil 6 with the FPC board 2 .

[0046] In summary, the present invention provides damping through the damping ring 5. During the vibration of the motor, the magnetic field cuts the damping ring 5, thereby generating eddy currents on the damping ring 5, thereby generating a damping effect on the motor. Compared with the magnetic fluid, damping glue or foam in the prior art, the utility model has the characteristics of stable and reliable performance, thereby increasing the service life and ensuring the vibration effect; the magnetic steel assembly 4 of the present invention includes a second magnetic steel 43, wherein the first magnetic steel 41 is provided at both ends of the second magnetic steel 43, and the magnetic poles of the second magnetic steel 43 and the first magnetic steel 41 are repelled. Most of the space in the casing 1 is the magnetic steel assembly 4, which can effectively increase the driving force. The magnetic pole repulsion setting makes the reverse electromotive force also very large, so that the motor itself has a sufficiently large electromagnetic damping; the magnetic steel assembly 4 of the present invention also includes a shaft 44, which passes through the first magnetic steel 41, the pole piece 42 and the second magnetic steel 43 respectively, and is used to locate the relative positions of the first magnetic steel 41, the pole piece 42 and the second magnetic steel 43 to ensure concentricity; the spring 7 of the present invention is made of plastic material, so that the connection method of the spring 7 and the housing 1 is glue bonding, which can completely avoid the laser welding fixing method of the traditional metal spring, and also avoid the poor reliability life caused by burns caused by laser welding; the utility model has a simple structure and is easy to manufacture. The first magnetic steel 41, the pole piece 42, the second magnetic steel 43, the shaft 44 and the spring 7 can all be self-positioned by the material, which greatly reduces the requirements for assembly tooling.

[0047] 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 cylindrical vibration motor, comprising a housing, characterized in that: The outside of the casing is connected to an FPC board, and a damping ring is bonded to the inner wall of the casing. The damping ring is made of conductive material, and two symmetrically arranged coils are bonded to the inner wall of the damping ring. A magnetic steel assembly is also provided inside the damping ring, and springs are bonded to both ends of the magnetic steel assembly. The outer ring of the spring is bonded to the inner wall of the casing, and cover plates are welded to both ends of the casing.

2. A cylindrical vibration motor according to claim 1, characterized in that: The magnetic steel assembly includes a second magnetic steel, wherein the first magnetic steel is respectively provided at both ends of the second magnetic steel, and the magnetic poles of the second magnetic steel and the first magnetic steel are arranged to repel each other.

3. A cylindrical vibration motor according to claim 2, characterized in that: A pole piece is provided between the second magnetic steel and the first magnetic steel.

4. A cylindrical vibration motor according to claim 3, characterized in that: The magnetic steel assembly further includes a shaft passing through the first magnetic steel, the pole piece and the second magnetic steel respectively.

5. The cylindrical vibration motor according to claim 1, characterized in that: The spring is made of plastic.

6. The cylindrical vibration motor according to claim 5, characterized in that: A plurality of glue overflow grooves are provided on the circumference of the spring.

7. The cylindrical vibration motor according to claim 5, characterized in that: An adhesive seat is provided on the end surface of the spring.

8. The cylindrical vibration motor according to claim 1, characterized in that: The FPC board, the housing and the damping ring are respectively provided with corresponding notches.

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