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, a cover body buckled with the shell to form an accommodating space, a stator assembly fixed on the cover body, and a vibrator assembly elastically supported in the shell through positioning of elastic pieces respectively connected with two opposite side walls of the shell, the stator assembly and the vibrator assembly are oppositely arranged in the accommodating space at an interval, the stator assembly comprises a flexible circuit board and an annular coil, and further comprises a first auxiliary magnet which is fixed on the cover body and is embedded with the coil, and a second auxiliary magnet which is fixed on the shell and corresponds to the first auxiliary magnet; the first auxiliary magnet and the second auxiliary magnet are symmetrically arranged on the upper side and the lower side of the vibrator assembly at intervals. In the four magnets of the vibration motor structure, the magnetic field effect generated by electrifying the two magnetic steels in the middle and the coil provides main driving force, and the upper and lower auxiliary magnets enhance the driving force, so that the stress of the elastic piece is effectively reduced, and the vibration performance and the reliability are improved.

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 development of electronic technology, portable consumer electronic products have gradually occupied the global consumer market, such as mobile phones, handheld game consoles, multimedia entertainment devices, etc. These electronic products generally use vibration motors for tactile feedback, such as incoming call notifications on mobile phones, vibration feedback on game consoles, etc. To meet such a wide range of applications, the requirements for the vibration performance and vibration feeling of vibration motors are getting higher and higher.

[0003] In the existing vibration motor, such as the invention patent application with the patent application number 201410024491.3, the vibration motor includes a housing, a cover plate that is mounted on the housing and forms an installation space with the housing, a vibration assembly that is suspended in the installation space through the positioning of elastic support members located on two opposite side walls of the housing respectively, and a coil located at a certain distance above the vibration assembly. The vibration assembly can reciprocally vibrate along a direction substantially parallel to the bottom surface of the housing under the action of magnetic force, and during the vibration process, the two elastic support members located on the opposite side walls are correspondingly stretched and compressed. The vibration assembly includes a vibration block, and a permanent magnet is provided on the vibration block. A magnetic conduction plate 11 is installed on one side of the installation space close to the bottom surface of the housing. This invention vibration motor improves the magnetic field intensity by increasing the magnetic conduction plate 11 to gather magnetic induction lines and enhances the vibration effect of the vibration motor. However, with the increasing miniaturization of electronic products, it is very difficult to make the driving force of this vibration motor structure large enough in a limited space. If a large driving force is required, the magnetic circuit part must occupy a sufficient amount of space. When the driving part occupies a larger space, the part left for the vibrator will be insufficient, thus unable to generate enough vibration. Summary of the Utility Model

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

[0005] A horizontal linear vibration motor includes a housing, a cover body that is buckled with the housing to form an accommodation space, a stator assembly fixed on the cover body, and an oscillator assembly that is elastically supported in the housing through the positioning of elastic members respectively connected to two opposite side walls of the housing. The stator assembly and the oscillator assembly are relatively spaced in the accommodation space. The stator assembly includes a flexible circuit board and a ring-shaped coil, and further includes a first auxiliary magnet fixed on the cover body and embedding the coil, and a second auxiliary magnet fixed on the housing corresponding to the first auxiliary magnet; the first auxiliary magnet and the second auxiliary magnet are symmetrically and spaced on the upper and lower sides of the oscillator assembly.

[0006] Preferably, the oscillator assembly includes a cuboid mass block with an installation groove recessed therein at the bottom, two magnetic steels embedded side by side in the installation groove, and a relief groove recessed above for making way for the second auxiliary magnet; the magnetic steels and the coil are arranged at a relative interval; the first auxiliary magnet and the second auxiliary magnet are spaced apart and symmetrically located on the upper and lower sides of the magnetic steels; the elastic members are respectively fixedly connected to both long sides of the mass block.

[0007] Preferably, both the first auxiliary magnet and the second auxiliary magnet are arranged as cuboids; the length direction of the second auxiliary magnet is parallel to the length direction of the mass block; the relief groove is arranged as a square; the length of the second auxiliary magnet is less than the length of the relief groove; a part of the second auxiliary magnet protrudes from the central position within the relief groove.

[0008] Preferably, the cross-sectional area of the relief groove is smaller than the bottom area of the installation groove; the relief groove is located at the central position of the installation groove; the relief groove communicates with the installation groove and vertically penetrates the mass block.

[0009] Preferably, a support plate is adaptively arranged at the bottom of the installation groove, and the support plate covers the relief groove.

[0010] Preferably, the first auxiliary magnet is arranged as a first permanent magnet or a first magnetic conductor; the second auxiliary magnet is arranged as a second permanent magnet or a second magnetic conductor.

[0011] Preferably, a damping member is provided between the mass block and the elastic member.

[0012] Preferably, reinforcing sheets are provided at the connection ends of the elastic members with the housing and the mass block respectively.

[0013] Compared with the prior art, the horizontal linear vibration motor of the present utility model has a higher vibration amount while effectively reducing the stress of the elastic member, avoiding the defect of short service life caused by problems such as its own fatigue of the traditional elastic member, and improving the vibration performance and reliability of the vibration motor. Description of the Drawings

[0014] Figure 1 is an exploded view of the structure of the horizontal linear vibration motor.

[0015] Figure 2 is an exploded view of the structure of the oscillator assembly and the elastic member.

[0016] Figure 3 is a Y-direction cross-sectional view of the horizontal linear vibration motor.

[0017] Figure 4It is a schematic diagram of the magnetic field directions of four magnets and a coil in the moving state of the oscillator assembly, as well as the magnetic force lines with respect to the housing and the cover.

[0018] Among them:

[0019] 1 - Outer shell;

[0020] 2 - Cover;

[0021] 3 - Oscillator assembly; 30 - Mass block; 31 - Magnet; 32 - Support plate; 33 - Damper;

[0022] 300 - Installation groove; 301 - Relief groove;

[0023] 4 - Stator assembly; 40 - Flexible circuit board; 41 - Coil;

[0024] 5 - Elastic member; 50 - Reinforcing piece;

[0025] 6 - First auxiliary magnet; 6' - Second auxiliary magnet. Specific embodiments

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] The structure of a horizontal linear vibration motor of the present invention is as Figures 1 to 4 shown, including a square outer shell 1 with an open end, a plate-shaped cover 2 that is fastened to the outer shell 1 to form an accommodation space (not labeled), a stator assembly 4 fixed on the cover 2, an oscillator assembly 3 that is elastically supported in the outer shell 1 by being positioned through elastic members 5 respectively connected to two opposite side walls (not labeled) of the outer shell 1, and a first auxiliary magnet 6 fixed on the inner surface of the cover 2 and a second auxiliary magnet 6' fixed on the inner surface of the bottom wall (not labeled) of the outer shell 1. The oscillator assembly 3 and the stator assembly 4 are relatively spaced apart in the accommodation space, and the first auxiliary magnet 6 and the second auxiliary magnet 6' are symmetrically and spaced apart on the upper and lower sides of the oscillator assembly 4. Among them, 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, the Z direction is the vertical height direction, the side facing the outer shell is the upper side, and the side facing the cover is the lower side.

[0028] The stator assembly 4 includes a flexible circuit board 40 and an annular coil 41. One end (not marked) of the flexible circuit board 40 is fixed to the inner surface of the cover body 2, and the other end (not marked) extends out of the accommodation space to connect to an external power supply. The coil 41 is adhesively fixed to the upper surface of the flexible circuit board 40 within the accommodation space and forms an electrical connection. The first auxiliary magnet 6 is embedded in the coil 41 to save the internal space utilization rate of the vibration motor.

[0029] The oscillator assembly 3 includes a rectangular parallelepiped mass block 30 with a mounting groove 300 recessed below, two magnetic steels 31 juxtaposed and embedded in the mounting groove 300, a relief groove 301 recessed above for making way for the second auxiliary magnet 6', and damping members 33 fixed on both long sides of the oscillator assembly 3 and located between the mass block 30 and the elastic member 5; the magnetic steels 31 and the coil 41 are arranged at intervals relative to each other. According to Ampere's law, a magnetic field is generated by passing an electric current through the coil 41 of the stator assembly 4 and acts on the magnetic steels 31 of the oscillator assembly 3 to generate a driving force. The direction of the current in the coil 41 is alternately changed to generate an alternating driving force, thereby driving the oscillator assembly 3 to reciprocate cyclically to produce a vibration effect; one end of the elastic member 5 is fixedly connected to both long sides of the mass block 30, and the other end is connected to two opposite side walls of the housing 1 to provide a restoring force for the oscillator assembly 3. Through the setting of the damping members 33 and the adaptation of contact with the elastic member 5, the damping effect is optimized, thereby preventing the elastic member 5 from deforming and improving the vibration performance; the first auxiliary magnet 6 and the second auxiliary magnet 6' are spaced apart and symmetrically located on the upper and lower sides of the magnetic steels 31, playing a role in assisting and enhancing the driving force of the magnetic steels 31, with a larger vibration amount and improved vibration performance. At the same time, under the requirement of the same driving force, the magnetic steels 31 can be made smaller and the mass block 30 can be made larger, so that the oscillator assembly 3 has a larger mass and a larger vibration amount. To save the Z-direction space of the vibration motor, the mounting groove 300 and the relief groove 301 are connected and penetrate the mass block 30 in the vertical direction, ensuring that the magnetic steels 31 achieve the maximum volume in the mounting groove and guaranteeing the magnetic force intensity; the cross-sectional area of the relief groove 301 is smaller than the bottom area of the mounting groove 300, so that a step difference is formed between the mounting groove 300 and the relief groove 301, thereby facilitating the positioning of the magnetic steels 31 in the Z direction. Preferably, a support plate 32 is adaptively provided at the bottom of the mounting groove 300, and the support plate 32 covers the relief groove 301 to enhance the mounting stability of the magnetic steels 31 in the mounting groove 300; the relief groove 301 is located at the central position of the mounting groove 300, making the oscillator assembly 3 symmetric in the X and Y directions and ensuring the balance of the oscillator assembly 3 during the reciprocating motion. Preferably, reinforcing pieces 50 are provided at the connecting ends of the elastic member 5 with the housing 1 and the mass block 30 respectively to ensure the connection strength between the elastic member 5 and the housing 1 and the mass block 30 and improve the vibration performance.

[0030] In the horizontal linear vibration motor of the present utility model, the first auxiliary magnet 6 and the second auxiliary magnet 6' are both preferably set as cuboids, and the corresponding relief groove 301 is set as a square. Among them, the length direction of the second auxiliary magnet 6' is parallel to the length direction of the mass block 30. The length of the second auxiliary magnet 6' is less than the length of the relief groove, and the second auxiliary magnet 6' partially protrudes from the central position within the relief groove 301. The setting of this relief groove 301 not only optimizes the Z-direction space utilization rate of the vibration motor, but also ensures that the mass block 30 has sufficient Y-direction displacement space during the reciprocating movement of the oscillator assembly 3 in the Y-direction, avoiding collision between the mass block 30 and the second auxiliary magnet 6', resulting in a long service life and high vibration performance of the vibration motor.

[0031] In the motion state of the oscillator assembly of the horizontal linear vibration motor of the present utility model, the magnetic field directions of the four magnets and the coil, and the magnetic force lines with respect to the housing and the cover are as Figure 4 shown. The housing 1 and the cover 2 are made of magnetically conductive materials. Among the four magnets, the two middle magnets 31 and the energized coil 41 generate a magnetic field to provide the main driving force, and the upper and lower first and second auxiliary magnets 6, 6' enhance the driving force, thereby increasing the vibration amplitude. Among them, the first auxiliary magnet 6 is set as the first permanent magnet or the first magnetically conductive body, and the second auxiliary magnet 6' is set as the second permanent magnet or the second magnetically conductive body.

[0032] When the first and second auxiliary magnets 6, 6' are the first magnetically conductive body and the second magnetically conductive body respectively, due to their characteristics of high magnetic permeability and low magnetic resistance, they are used to guide and concentrate the magnetic field, thereby enhancing the driving force of the horizontal linear vibration motor of the present utility model, with high vibration performance and strong vibration feeling.

[0033] When the first and second auxiliary magnets 6, 6' are the first permanent magnet and the second permanent magnet respectively, an auxiliary magnetic field is generated by the first permanent magnet and the second permanent magnet, which not only enhances the driving force of the horizontal linear vibration motor of the present utility model, but also provides the function of a positive spring, reducing the stress of the elastic member 5. As Figure 4 shown, when the oscillator assembly 3 deviates from the equilibrium position and moves to the right, according to the magnetic force lines and the magnetic pole distribution, it can be seen that the overall horizontal suction force received by the oscillator assembly 3 is to the left, and at this time, the restoring force generated by the elastic member 5 due to deformation is also to the left, that is, the suction force received by the oscillator assembly and the restoring force of the elastic member 5 are in the same direction, forming the function of a positive spring. When the oscillator assembly 3 is simultaneously acted upon by the suction force and the elastic member 5, the spring constant of the restoring force generated by the elastic member 5 per unit deformation increases. At this time, the mechanical spring constant of the elastic member 5 itself decreases. In the horizontal linear vibration motor of the present utility model, the stress of the elastic member 5 is proportional to the mechanical spring constant of the elastic member 5, that is: when the mechanical spring constant of the elastic member 5 decreases, the stress of the elastic member 5 decreases, thereby avoiding the problem of short service life of the elastic member 5 caused by deformation fatigue and other problems, ensuring the stable performance of the vibration motor system and improving the reliability.

[0034] When the first auxiliary magnet 6 is a first permanent magnet and the second auxiliary magnet 6' is a second magnetic conductor, or when the first auxiliary magnet 6 is a first magnetic conductor and the second auxiliary magnet 6' is a second permanent magnet, the vibration amount of the vibration motor can be increased, and at the same time, the stress of the elastic member 5 can be reduced, ensuring the stable performance of the vibration motor system and improving the reliability.

[0035] The driving force enhancement structure of the first auxiliary magnet and the second auxiliary magnet of the horizontal linear vibration motor of the present invention is also applicable to the oscillator assembly with three magnetic steels.

[0036] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the terms "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 invention 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, and therefore should not be construed as a limitation of the present invention.

[0037] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. 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, a cover body that is fastened to the housing to form an accommodation space, a stator assembly fixed to the cover body, and an oscillator assembly that is elastically supported within the housing by being positioned through elastic members respectively connected to two opposite side walls of the housing. The stator assembly and the oscillator assembly are relatively spaced apart and disposed within the accommodation space. The stator assembly includes a flexible circuit board and a toroidal coil, and is characterized in that, It further includes a first auxiliary magnet fixed on the cover body and embedding the coil, and a second auxiliary magnet fixed on the outer shell corresponding to the first auxiliary magnet; the first auxiliary magnet and the second auxiliary magnet are symmetrically and spaced apart on the upper and lower sides of the oscillator assembly.

2. The horizontal linear vibration motor according to claim 1, wherein The oscillator assembly includes a cuboid mass block with an installation groove recessed downward, two magnetic steels juxtaposed and embedded in the installation groove, and a relief groove recessed upward for making way for the second auxiliary magnet; the magnetic steels and the coil are relatively spaced; the first auxiliary magnet and the second auxiliary magnet are spaced and symmetrically located on the upper and lower sides of the magnetic steels; the elastic members are respectively fixedly connected to the two long sides of the mass block.

3. The horizontal linear vibration motor according to claim 2, wherein Both the first auxiliary magnet and the second auxiliary magnet are arranged as cuboids; the length direction of the second auxiliary magnet is parallel to the length direction of the mass block; the relief groove is arranged as a square; the length of the second auxiliary magnet is less than the length of the relief groove; the second auxiliary magnet partially protrudes from the central position in the relief groove.

4. The horizontal linear vibration motor according to claim 3, characterized in that, The cross-sectional area of the relief groove is smaller than the bottom area of the installation groove; the relief groove is located at the central position of the installation groove; the relief groove communicates with the installation groove and vertically penetrates the mass block.

5. The horizontal linear vibration motor according to claim 4, wherein A support plate is adaptively arranged at the bottom of the installation groove, and the support plate covers the relief groove.

6. The horizontal linear vibration motor according to claim 5, characterized in that The first auxiliary magnet is arranged as a first permanent magnet or a first magnetic conductor; the second auxiliary magnet is arranged as a second permanent magnet or a second magnetic conductor.

7. The horizontal linear vibration motor according to claim 6, wherein A damping member is provided between the mass block and the elastic member.

8. The horizontal linear vibration motor according to claim 7, characterized in that, Reinforcing sheets are provided at the connection ends of the elastic members with the outer shell and the mass block respectively.

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