WO2019029050A1 - Linear vibration motor - Google Patents

Abstract

A linear vibration motor comprises: a stator assembly, comprising a housing (1) having an accommodating cavity, and a magnet (2) disposed in the accommodating cavity and fixedly attached to the housing (1), the magnet (2) comprising a hollow portion (21); a vibrator assembly, comprising a coil (3) and a mass block (4) disposed on a magnetically conductive board (5), wherein the hollow portion (21) extends in a vibration direction of the vibrator assembly, and when the vibrator assembly vibrates, the coil (3) vibrates along with the vibrator assembly and is inserted into the hollow portion (21) of the magnet (2); and an elastic support member (6), one end of the elastic support member (6) being fixedly attached to the magnetically conductive board (5), the other end thereof being fixedly attached to the housing (1), the elastic support member (6) being configured to suspend the vibrator assembly in the accommodating cavity of the housing (1). The above linear vibration motor can utilize the magnetism of a magnet (2) to the maximum extent to improve the utilization efficiency of magnetic field lines of the magnet (2) by a coil and the electromagnetic driving force of a motor, and a magnetically conductive board (5) and a mass block (4) and an elastic support member (6) are firmly connected.

Description

Linear vibration motor Technical field

The invention relates to the field of electronic product technology. More specifically, it relates to a linear vibration motor.

Background technique

With the development of communication technologies, portable electronic devices, such as mobile phones, tablet computers, smart wearable devices, multimedia entertainment devices, etc., have become a necessity for people. In these electronic devices, a miniature linear motor is usually used for feedback of the system, such as clicking the vibration feedback of the touch screen.

The linear vibration motor generally includes a vibrator assembly including a mass, a coil and a spring, and the stator assembly includes a housing, a magnet, an FPCB, etc., wherein the magnet and the FPCB are fixedly coupled to the housing, and the mass and the coil are fixed. In combination, the shrapnel is connected between the mass and the housing, and the coil is located within the magnetic field generated by the magnet. Thus, after the coil is energized, the coil is subjected to the ampere force, and the vibrator assembly is also driven by the ampere force to reciprocate. Due to the large weight of the mass, the vibration of the entire linear vibration motor is obtained.

However, the above-mentioned conventional linear vibration motor has a defect that the magnetic flux utilization rate of the magnet is low, and the vibration force of the vibration motor of the structure is weak, which affects the overall tactile sensation of the user.

Therefore, there is a need to provide a new type of linear vibration motor to solve the drawbacks of the prior art.

Summary of the invention

SUMMARY OF THE INVENTION An object of the present invention is to provide a linear vibration motor having a strong vibration force and a vibrator assembly reliably coupled to a spring piece.

According to an aspect of the invention, a linear vibration motor is provided, comprising:

a stator assembly, the stator assembly including a housing having a receiving cavity, a magnet disposed within the receiving cavity and coupled to the housing, the magnet including a hollow portion;

a vibrator assembly including a coil and a mass disposed on a magnetic permeability plate, the hollow portion extending in a vibration direction of the vibrator assembly, the coil vibrating with the vibrator assembly and inserting the magnet when the vibrator assembly vibrates Hollow part

An elastic support member, one end of the elastic support member is fixedly coupled to the magnetic conductive plate, and the other end is fixedly coupled to the housing, and the elastic support member is configured to suspend the vibrator assembly in the receiving cavity of the housing Inside.

Preferably, the magnetic conductive plate includes a horizontal lower end fixedly coupled to a lower surface of the coil, a horizontal extension fixedly coupled to a lower surface of the mass, and integrally formed at the horizontal lower end and horizontally extending a connecting portion between the portions, a lower surface of the horizontal extending portion being fixedly coupled to a top surface of the elastic support member.

Preferably, the magnetic conductive plate further includes a vertical extension extending upwardly at an outer edge of the horizontal extension, the vertical extension being inserted into the mass and fixedly coupled to the mass.

Preferably, the magnetic conductive plate includes a horizontal upper end fixedly coupled to a lower surface of the coil, a horizontal extension fixedly coupled to a top lower surface of the elastic support, and an upper end portion integrally formed at the horizontal A joint between the horizontal extensions, the bottom surface of the mass being fixedly coupled to the top surface of the elastic support.

Preferably, the magnetic conductive plate is made of a magnetic material and has a circular or polygonal shape.

Preferably, the horizontal extension of the magnetic conductive plate has at least one rounded periphery, and the magnetic conductive plate defines at least one notch.

Preferably, the shape of the magnetic conductive plate is a circular shape with three notches and three through holes symmetrically at the center.

Preferably, the shape of the magnetic conductive plate is a circular shape with two notches at the center.

Preferably, the shape of the magnetic conductive plate is an equilateral triangle with three notches at the center, and the three corners of the triangle are rounded.

Preferably, the shape of the magnetic conductive plate is a square symmetrically opened with four notches, and the four corners of the square are rounded.

The beneficial effects of the present invention are as follows:

The linear vibration motor provided by the invention can maximize the magnetic properties of the magnet by improving the structure of the magnet and its arrangement with the coil, improve the utilization efficiency of the magnetic line of the coil magnet, improve the electromagnetic driving force of the motor, and increase the driving force. The effective frequency of the motor is increased, which is convenient for the application of the dual-frequency or multi-frequency resonance frequency, satisfies the requirement of the vibration of the motor under the multi-frequency point, and improves the tactile experience of the motor. The linear vibration motor of the present invention also provides a plurality of connection modes of the magnetic conductive plate and the elastic support member and the mass block, and a plurality of shapes of magnetic conductive plates, so that the linear vibration motor of the invention can meet different process requirements, and both can A firm connection between the magnetically permeable plate and the elastic support and the mass is achieved.

DRAWINGS

The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

Fig. 1 is a view showing the structural assembly of a linear vibration motor according to a first embodiment of the present invention.

Fig. 2 is a cross-sectional view showing the structure of a linear vibration motor according to a first embodiment of the present invention.

FIG. 3 is a partial structural schematic view showing a linear vibration motor according to Embodiment 1 of the present invention.

FIG. 4 is a schematic structural view of a magnetic conductive plate provided in Embodiment 1 of the present invention.

FIG. 5 is a partial structural schematic view showing a linear vibration motor according to Embodiment 1 of the present invention.

FIG. 6 is a schematic view showing the structure of a first magnetic conductive plate provided in Embodiment 2 of the present invention.

FIG. 7 is a schematic structural view showing a second magnetic conductive plate provided in Embodiment 2 of the present invention.

FIG. 8 is a schematic view showing the structure of a third magnetic conductive plate provided in Embodiment 2 of the present invention.

Fig. 9 is a partial structural schematic view showing a linear vibration motor according to a third embodiment of the present invention.

Detailed ways

In the following description, for the purposes of illustration However, it is apparent that these embodiments may be practiced without these specific details. In other instances, well known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments.

The "mass" used in the description of the following detailed description may also be referred to as "weights", both of which refer to one of the components that cooperate with the magnet or coil to vibrate within the motor housing as a vibrator assembly. Further, the present invention is mainly used for the improvement of the linear vibration motor used in the description, and may also be referred to as a Y-direction vibration motor. However, for convenience of description, in the following description of the embodiments, a linear vibration motor will be specifically described as an example.

In order to explain the present invention more clearly, the present invention will be further described in conjunction with the preferred embodiments and the accompanying drawings. It should be noted that, for ease of understanding, the descriptions of the "upper surface", "lower surface", "bottom", "top" and the like referred to in the present invention are merely illustrative of the styles provided with reference to the drawings, which are not used. To the extent that it is understood by those skilled in the art, when the position of the motor is changed in the present invention, the corresponding description and terminology referred to herein should be based on its actual effect in the motor.

In a first embodiment of the linear vibration motor of the present invention shown in Figures 1 and 2, the linear vibration motor includes a stator assembly, a vibrator assembly, and an elastic support. As shown in FIG. 1, the stator assembly includes a housing 1 having a receiving cavity, a magnet 2 located in the receiving cavity and fixed in combination with the housing 1, the magnet 2 including a hollow portion 21, the hollow portion 21 The magnet 2 can be in the direction of vibration of the vibrator assembly; the magnet 2 can be a segmented or continuous ring structure in the present invention, which is not limited in the present invention. The vibrator assembly includes a coil 3 fixedly coupled to the magnetic conductive plate 5 and a mass 4 surrounding the periphery of the coil 3; when the vibrator assembly vibrates, the coil 3 vibrates with the vibrator assembly and is inserted into the magnet 2 The hollow portion 21, the ring-shaped magnet 2, the coil 3, and the mass 4 are disposed in a coaxial manner. The resilient support 5 is configured to suspend the vibrator assembly within the receiving cavity of the housing 1.

Specifically, the housing 1 includes a first housing 11 having an opening at the bottom, and is fixedly coupled thereto. The second housing 12 at the opening; the first housing 11 and the second housing 12 form a housing 1 having a receiving cavity. It should be noted that, in the present invention, both the first housing 11 and the second housing 12 are made of a material having magnetic permeability, so that it is convenient to close the magnetic lines of the magnet, so that the magnetic action of the magnet 2 is maximized to enhance the motor. Electromagnetic driving force. In addition, as a specific embodiment of the present invention, as shown in FIG. 1 , the housing 1 has a circular structure, and it is obvious that the housing 1 can also have a non-circular cross-section structure, which can be based on actual performance by those skilled in the art. Ask for a choice.

As shown in FIGS. 1 and 2, in the linear vibration motor of the present invention, the magnet 2 having a ring structure fixed in combination with the inner side surface of the top wall of the first casing 11 is used as a stator assembly, and the coil 3 is used as a part of the vibrator assembly. The vibrator assembly is vibrated and inserted into the hollow portion 21 of the magnet 2, the magnet 2 having a ring structure as a stator and its arrangement with the coil 3 as a vibrator, and the columnar solid core used in the conventional vibration motor. Compared with the structural magnet, since the magnetic lines of force of the existing cylindrical solid magnet are radiated and dispersed outward from the central axis, the magnetic lines of the ring-shaped structural magnet of the present invention are collected on the central axis, and thus are disposed in the central axis of the magnet having the annular structure. The coil position of the upper coil is higher than the coil disposed around the periphery of the cylindrical solid magnet; and in the present invention, the coil is disposed in the inner space of the magnet having the annular structure, and the diameter of the coil can be made smaller, so the coil is effective. The number of turns is significantly higher than the effective number of turns of the large-diameter coil disposed on the periphery of the cylindrical solid magnet, and the linear vibration motor provided by the present invention can maximize the use of magnetic The magneticity improves the utilization efficiency of the magnetic line of the coil magnet, and improves the electromagnetic driving force of the motor, and the increase of the driving force increases the effective bandwidth of the motor, facilitates the application of the dual-frequency or multi-frequency resonant frequency, and satisfies the multi-frequency point. The requirement for the vibration of the motor improves the tactile experience of the motor and improves the overall performance of the linear vibration motor as a whole.

As shown in FIGS. 2 and 3, the magnetic conductive plate 5 of the present invention includes a horizontal lower end portion 51, a horizontal extending portion 52, and an inclined connecting portion 53 integrally formed between the horizontal lower end portion 51 and the horizontal extending portion 52. The coil 3 is fixedly coupled to the horizontal lower end portion 51, and the mass 4 is fixedly coupled to the upper surface of the horizontally extending portion 52. The lower surface of the horizontally extending portion 52 is fixedly coupled to the top end surface of the elastic support member 6, and the lower end portion of the horizontal portion The surface is flush with the top surface of the top end of the elastic support member 6. A gap for the insertion of the magnet 2 is formed between the coil 3 and the mass 4. The other end of the elastic support member 6 is fixedly coupled to the inner side surface of the second casing 12, and the vibrator assembly is suspended in the accommodating chamber of the casing 1.

Further, the linear vibration motor in the present embodiment further includes an FPCB capable of electrically connecting the coil 3 to an external device, one end of the FPCB being fixedly coupled to the lower surface of the horizontal lower end portion 51 of the magnetic conductive plate 5, and the coil 3 The other end is fixedly coupled to the second housing 12 and located outside the housing 1 for electrical connection with an external circuit.

The shape of the magnetic conductive plate 5 is a circular or polygonal shape made of a magnetic material, and at least one notch or a through hole for connecting the coil lead and the FPCB is opened, and the horizontal extending portion 52 includes at least one circle. angle. As shown in FIG. 4, the magnetic conductive plate 5 has a circular shape, and is provided with three notches 55 and three through holes 56 which are evenly spaced.

As shown in FIG. 5, the magnetic conductive plate 5 of the present invention further includes a vertical extending portion 54 extending upwardly from an outer edge of the horizontal extending portion 52, the vertical extending portion 54 being inserted into the mass 4 and with the mass 4 The inner side wall is combined and fixed to further increase the bonding area between the magnetic conductive plate 5 and the mass 4, thereby increasing the degree of bonding between the two and improving the reliability of the connection.

The top of the elastic supporting plate 6 in this embodiment may be a circular ring shape or a circular plate shape. When the top of the elastic supporting member 6 is a disk shape, the bottom surface of the horizontal lower end portion 51 and the top surface of the elastic supporting member 6 Fixed bonding.

In the second embodiment of the present invention, as shown in FIG. 6-8, the difference from the first embodiment is the shape of the magnetic conductive plate 5. In the embodiment, the shape of the magnetic conductive plate 5 is a flat type, the coil 3 and The mass 5 is fixedly coupled to the upper surface of the magnetic conductive plate 5, and the lower surface of the magnetic conductive plate 5 is fixedly coupled to the top end of the elastic support member 6. As shown in FIG. 6, the magnetic conductive plate 5 has a circular shape, and two notches 55 are opened in a central symmetrical manner, and the notches 55 are used to connect with the FPCB through the coil leads. As shown in FIG. 7, the shape of the magnetic conductive plate 5 is a triangle, and the three corners of the triangle are rounded, and three notches 55 are opened in a central symmetry manner. As shown in Fig. 8, the shape of the magnetic conductive plate 5 is square, and the four corners of the square are rounded, and four notches 55 are opened in a central symmetry manner. The magnetic conductive plate 5 is provided with a plurality of notches 55 and/or through holes 56, which can simplify the connection process of the coil 3 and the magnetic conductive plate 5, and reduce the assembly difficulty.

In the third embodiment of the present invention shown in FIG. 9, the difference from the first embodiment is the shape of the magnetic conductive plate 5. In the present embodiment, the magnetic conductive plate 5 includes a horizontal upper end portion 51', a horizontal extending portion 52', and an inclined connecting portion 53' integrally formed between the horizontal upper end portion and the horizontal extending portion, and the upper surface of the horizontal upper end portion 51' is The lower surface of the coil 3 is fixedly coupled, and the upper surface of the horizontal extending portion 52' is fixedly coupled to the top lower surface of the elastic support member 6, and the upper surface of the horizontal upper end portion 51' is flush with the top upper surface of the elastic support member 6. The magnetic vibration plate 5 and the elastic support member 6 of the linear vibration motor of the invention have various assembly relationships, and can be selected according to different process requirements, so that the solid connection can be achieved under different process requirements, and the manufacturing process is difficult.

It is apparent that the above-described embodiments of the present invention are merely illustrative of the present invention and are not intended to limit the embodiments of the present invention, and those skilled in the art can also make the above description. It is to be understood that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (10)

A linear vibration motor, comprising: a stator assembly, the stator assembly including a housing having a receiving cavity, a magnet disposed within the receiving cavity and coupled to the housing, the magnet including a hollow portion; a vibrator assembly including a coil and a mass disposed on a magnetic permeability plate, the hollow portion extending in a vibration direction of the vibrator assembly, the coil vibrating with the vibrator assembly and inserting the magnet when the vibrator assembly vibrates Hollow part An elastic support member, one end of the elastic support member is fixedly coupled to the magnetic conductive plate, and the other end is fixedly coupled to the housing, and the elastic support member is configured to suspend the vibrator assembly in the receiving cavity of the housing Inside. A linear vibration motor according to claim 1, wherein said magnetic conductive plate includes a horizontal lower end portion fixedly coupled to a lower surface of said coil, and a horizontal extension portion fixedly coupled to a lower surface of said mass block, And a joint integrally formed between the horizontal lower end portion and the horizontal extension portion, the lower surface of the horizontal extension portion being fixedly coupled to the top surface of the elastic support member. A linear vibration motor according to claim 2, wherein said magnetic conductive plate further comprises a vertical extension extending upwardly at an outer edge of said horizontal extension, said vertical extension being inserted into said mass The block is fixedly connected to the mass. A linear vibration motor according to claim 1, wherein said magnetic conductive plate includes a horizontal upper end fixedly coupled to a lower surface of said coil, and a horizontal extension fixedly coupled to a top lower surface of said elastic support member And a joint integrally formed between the horizontal upper end portion and the horizontal extension portion, the bottom surface of the mass block being fixedly coupled to the top surface of the elastic support member. A linear vibration motor according to any one of claims 1 to 4, wherein said magnetic conductive plate is made of a magnetic material and has a circular or polygonal shape. The linear vibration motor according to claim 5, wherein the outer periphery of the horizontal extension of the magnetic conductive plate has at least one rounded corner, and the magnetic conductive plate defines at least one notch. The linear vibration motor according to claim 6, wherein the shape of the magnetic conductive plate is a circular shape in which three notches and three through holes are symmetrically formed in the center. The linear vibration motor according to claim 6, wherein the shape of the magnetic conductive plate is a circular shape in which two notches are symmetrically formed. The linear vibration motor according to claim 6, wherein the shape of the magnetic conductive plate is an equilateral triangle having three notches centrally symmetrically, and the three corners of the triangular shape are rounded. The linear vibration motor according to claim 6, wherein the shape of the magnetic conductive plate is a square symmetrically opened with four notches, and the four corners of the square are rounded.

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