CN116613952A - Linear vibration motor - Google Patents

Abstract

The present invention provides a linear vibration motor, comprising: a movable part, a suspension device and a fixed part; wherein the movable part includes at least one magnet set, and the fixed part includes at least one coil, at least one magnetic conduction component and A housing; the magnet group of the movable part and the coil of the fixed part and the magnetic permeable component are arranged in opposite directions through a gap, and the at least one magnetic permeable component is located above, below or above and below the magnet group; The suspension device includes two leaf springs, which are respectively located on both sides of the movable part, and one side of each leaf spring is connected to the movable part, and the other side is connected to the fixed part. In the natural state of non-action, it is a straight sheet and the leaf spring at the junction of both sides has no bending characteristics throughout the entire length.

Description

Linear Vibration Motor

technical field

The invention relates to a linear vibration motor.

Background technique

With the popularity of smart mobile devices, such as mobile phones, tablet computers and wearable devices, using a linear vibration motor as a vibration source has long become a touch control technology due to its advantages of faster response and more power saving. Feedback mainstream technology. In view of the trend of thinner and lighter electronic products, how to increase the magnetic field strength and maintain the life of the product under the condition of thinner and lighter has become an increasingly important part of the specification performance of linear vibration motors.

The traditional linear vibration motor structure basically consists of a movable part, a fixed part and a suspension system; for example, in the simplest implementation, the movable part can be a magnet set, and the fixed part can be It is a coil set, and the suspension system can be a spring set. In other words, the structure of the linear vibrating motor determines its vibration mode is that the magnet group is controlled by the coil group, and moves relative to the coil group in a linear manner to reach the resonant frequency. In addition, in the linear vibrating motor, at least one magnetic permeable component is usually arranged in the fixing part to improve the vibrating effect thereof.

Under the premise of thinning the product, the thickness of the product is compressed. The first thing to bear the brunt is to reduce the thickness of the magnet and the coil, which directly results in a decrease in the magnetic field strength. In order to overcome this phenomenon, the current technology usually achieves the purpose of increasing the magnetic field strength of the product by means of the added magnetic permeable component that can guide the magnetic force lines to pass through the coil to the maximum extent. However, although this technical solution is effective, it also causes other problems.

For example, adding magnetic components can effectively increase the strength of the magnetic field, but the relative magnetic attraction force also causes a burden on the suspension system of the linear vibration motor. The current common non-contact suspension system is mostly shrapnel type. Figures 1A to 1C show the diagrams of leaf suspension springs, L-shaped suspension springs and C-shaped suspension springs, respectively. In order to achieve the goal of parallel movement, the configuration of the shrapnel suspension device is mostly U-shaped or C-shaped, and the U-shaped and C-shaped shrapnel have turning characteristics in the configuration; Table 1 shows the configuration of different shrapnel suspension systems the natural frequency of . The stronger the rigidity of the shrapnel suspension system configuration, the higher the natural frequency, as shown in Table 1; therefore, the more turning features, the weaker the stiffness of the UZ direction (perpendicular to the XY plane direction) of the shrapnel, as shown in Figure 1A , as shown in Figure 1B and Figure 1C, the carrier and the distance Y and A are the same; X is the length of the turning point of the 2-side shrapnel + 2*A, and UX indicates the direction parallel to the X axis.

Table 1

There are two common solutions to overcome the lack of rigidity in the UZ direction of the shrapnel:

First, according to the rigidity in the UZ direction that the suspension system can withstand, match the size and gap of the corresponding magnetic permeable components; the advantage of this method is to effectively increase the magnetic field strength, but the disadvantage is that the rigidity factor in the UZ direction of the suspension system needs to retain the gap. As a result, the magnetic conduction effect of the magnetic permeable component is reduced, and the design thickness of the product is also limited.

Second, add other rigid support components in the UZ direction, such as shafts, the number of shrapnel, and magnetic fluid; The disadvantage is that it is easy to generate derivative design problems such as increased assembly difficulty, friction (non-linear), material properties; specifically, when adding shaft components, there will be thickness restrictions in the structure, and friction (non-linear) problems will occur; When the number of shrapnels is increased, the difficulty of assembly increases, and the length and width of the product will be limited; when the ferrofluid (physical damping) is added, it is easily affected by temperature, and the verification of product characteristics and temperature reliability is limited.

Therefore, on the premise of thinning linear vibration motor products, with the goal of increasing the magnetic field strength of the product, how to design a linear vibration motor so that its magnetic components It is a challenge that the industry is currently facing to place in a position that can guide the lines of magnetic force so that they can pass through the coil to the maximum extent.

Contents of the invention

An embodiment of the present invention discloses a linear vibration motor, comprising: a movable part, a suspension device and a fixed part; wherein the movable part includes at least one magnet set, and the magnet set includes at least three magnets, so as to The magnets are arranged at intervals, and the magnetization direction of the magnets is the up-down direction, and the polarities of adjacent magnets are opposite to each other when they are arranged. The fixed part includes at least one coil, at least one magnetic conduction component and a casing; the magnet set of the movable part The coil of the fixed part and the magnetic permeable component are arranged in the opposite direction across a gap, the polar surfaces on both sides of the magnet group are opposite to the coil of the fixed part and the magnetic permeable component, and the magnetic permeable component of the fixed part The size of the component in the non-moving direction needs to be larger than the size of the magnet group in the non-moving direction, the at least one magnetically conductive component is located above or below the magnet group, and when the number of the at least one magnetically conductive component exceeds one, the The magnetic conductive components can be arranged above and below the magnet group respectively; the suspension device includes two leaf springs, which are respectively located on both sides of the movable part, and one side of each leaf spring is connected to the movable part. The other side is connected to the fixed part, so that the movable part is supported by the suspension device and moves freely relative to the fixed part. The height of the connecting end of each leaf spring is the same as that of the movable part, The height of the connecting end of the fixing part is the same, and the suspension device is in the shape of a linear sheet in a natural state when it is not in motion, and the leaf springs at the joints of both sides have no bending characteristics throughout the entire length.

In a preferred embodiment, at least one hole is disposed on the magnetic permeable component.

In a preferred embodiment, the hole is a rectangular hole, and the four sides of the hole are respectively parallel to the four sides of the magnet set; and under the condition that the hole width and external dimensions are fixed, 0≤the X direction of the hole Size ≤ the hole is 3/4 of the middle magnet; under the condition that the length of the hole and the external size are fixed, 0 ≤ the size of the hole in the Y direction ≤ the width of the hole in the Z direction relative to the magnet.

In a preferred embodiment, the hole can be a groove-shaped hole that cuts off the upper edge or the lower edge of the magnetic conduction component, so that the hole of the magnetic conduction component presents a groove shape; and, has a groove shape The magnetic conduction component of the hole can have both sides of the magnetic conduction component as end faces, or the end face of the grooved hole as the end face.

In a preferred embodiment, the hole patterns of the magnetic permeable components can be stacked with each other to form a composite hole; the composite hole is the joint area after stacking two or more holes, the composite hole It can be superimposed on one side or both sides, and the final composite hole can be a closed hole or a grooved hole.

Description of drawings

Fig. 1A to Fig. 1C show respectively the sheet-shaped suspension spring, the L-shaped suspension spring and the C-shaped suspension spring type diagram;

Fig. 2 is a schematic diagram of the connection between the movable part and the suspension device of the linear vibration motor of the present invention;

3 is a schematic cross-sectional view of the structure of the fixed part of the linear vibration motor of the present invention;

FIG. 4 is a schematic diagram of an approximately closed magnetic circuit formed by a magnet group and a magnetic permeable component group of the linear vibration motor of the present invention;

FIG. 5A is a schematic diagram of the configuration of the magnetic-conducting component group and the magnet group of the linear vibration motor of the present invention;

Fig. 5B is a schematic diagram showing the relationship curve between the magnetic restoring force of the linear vibration motor of the present invention and the displacement distance of the end face of the magnet;

6A to 6C are schematic diagrams of holes provided on the magnetic permeable component of the linear vibration motor of the present invention

7A to 7F are schematic diagrams of various implementations of the magnetic permeable component under the condition that the hole width and external dimensions are fixed;

8A to 8B are schematic diagrams showing the relationship curves of the magnetic restoring force in the X direction, the magnetic attraction force in the Z direction, and the displacement distance of the end surface of the magnet under a fixed hole width;

9A to 9H are schematic diagrams of various implementations of the magnetic permeable component under the condition that the length of the hole and the external dimensions are fixed;

10A to 10B are schematic diagrams showing the relationship curves of the magnetic restoring force in the X direction, the magnetic attraction force in the Z direction, and the displacement distance of the end surface of the magnet under a fixed hole length;

FIG. 11 is a schematic diagram of an embodiment of a magnetic permeable component group having grooved holes in a linear vibration motor of the present invention;

FIG. 12 is a schematic diagram of an embodiment of a magnetic permeable assembly with compound holes in the linear vibration motor of the present invention.

Explanation of reference signs:

101 - magnet;

102-coil;

103-magnetic conduction component;

104 - shell;

105-leaf spring;

105A-movable part connection end;

105B-the connection end of the fixed part;

105C-The full length of the leaf spring;

L1- length of magnetic permeable component group;

L2 - the length of the magnet group;

L3 - magnet group width;

L4- hole width;

c-hole length;

d- Displacement distance of magnet end face.

Detailed ways

The implementation of the present invention will be described below with reference to specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific examples, and various modifications and changes can be made to the details in the description of the present invention based on different viewpoints and applications without departing from the spirit of the present invention.

It should be noted that the structures, proportions, sizes, etc. shown in the drawings attached to this specification are only used to match the content disclosed in the specification for the understanding and reading of those familiar with this technology, and are not used to limit the implementation of the present invention. Conditions, so it has no technical substantive meaning, any modification of structure, change of proportional relationship or adjustment of size, without affecting the effect and purpose of the present invention, should fall within the scope of the present invention. The technical content must be within the scope covered.

Refer to Figure 2 and Figure 3. The present invention mainly discloses a linear vibration motor. A linear vibration motor of the present invention includes a movable part, a suspension device and a fixed part. FIG. 2 is a schematic view showing the connection between the movable part and the suspension device; FIG. 3 is a schematic cross-sectional view showing the structure of the fixed part. As shown in Figure 2 and Figure 3, the movable part includes at least one magnet set, the magnet set includes at least three magnets 101, the fixed part includes at least one coil 102, a magnetic permeable component 103 and a housing 104; The magnet group of the movable part and the coil of the fixed part and the magnetic conduction assembly are arranged in the opposite direction across a gap, and the polar surfaces on both sides of the magnet group are opposite to the coil of the fixed part and the magnetic conduction assembly, and the fixed part The size of the magnetically conductive component in the non-moving direction needs to be larger than the size of the magnet group in the non-moving direction, and the at least one magnetically conductive component is located above or below the magnet group. When the number of the at least one magnetically conductive component exceeds one , the magnetic permeable component can be respectively arranged above and below the magnet group; the suspension device includes two leaf springs 105, which are respectively located on both sides of the movable part, and one side of each leaf spring is connected to The other side of the movable part is connected to the fixed part, so that the movable part is supported by the suspension device and moves freely relative to the fixed part. As shown in Figure 2, the heights of the movable part connecting end 105A and the fixed part connecting end 105B of the leaf spring 105 are equal to the height of the connection between the movable part and the fixed part. In the natural state without action, it is a straight sheet and the full length 105C of the leaf spring at the junction of both sides has no bending feature.

Fig. 4 is a schematic diagram of an approximately closed magnetic circuit formed by the magnet group and the magnetic conduction assembly group of the linear vibration motor of the present invention; Fig. 5A shows the configuration of the magnetic conduction assembly group and the magnet assembly of the linear vibration motor of the present invention Schematic diagram; FIG. 5B is a schematic diagram of the relationship curve between the magnetic restoring force and the displacement distance of the magnet end surface of the electric linear vibration motor of the present invention. Among them, L1 is the length of the magnetic permeable component, L2 is the length of the magnet group, and d is the displacement distance of the end face of the magnet.

It is worth noting that during the vibration process, between the magnet group of the movable part and the coil group of the fixed part and the magnetic permeable component group, the coil group is applied with the magnetic field of the magnet group of the movable part. The generated Lorentz force causes displacement of the movable part and the suspension device. In addition, because the magnetic conduction component group and the magnet group form a nearly closed magnetic circuit, as shown in Figure 4; when the movable part and the suspension device are displaced, the movable part can be additionally provided relative to the fixed A magnetic restoring force of the part, as shown in FIG. 5B , can assist the leaf spring suspension device to bring the movable part back to its mechanical origin.

In order to increase the strength of the magnetic field so that the magnetic-conducting assembly can be placed at the position where the magnetic field lines are guided to maximize the passage through the coil, the aforementioned problem of insufficient rigidity in the UZ direction of the leaf spring must be overcome. Its main operating principle is explained as follows:

Derived from the formula of section moment of inertia:

Kz/Kx=Iz/Ix=(bh3/12)/(b3h/12)=(h/b)2

Among them, b is the width of the leaf spring, that is, the width in the UX direction, h is the thickness of the leaf spring, that is, the thickness in the UZ direction, and K is the spring constant of the leaf spring; in other words, when the ratio of h to b The larger the gap, the stronger the stiffness of the leaf spring in the UZ direction. Based on this, the shape and specification of the leaf spring will be constructed so that the rigidity of the leaf spring in the UZ direction can support the magnetic attraction force in the UZ direction after the magnetic permeable assembly is increased.

However, increasing the dimension of the leaf spring in the thickness direction satisfies the increased rigidity in the UZ direction (that is, the increase in Kz), and at the same time, the problem of stress increase caused by the increase of the spring constant of the leaf spring arises. According to Hooke’s Law (Hooke’s Law): F=KX, under the condition that X remains unchanged, the increase of K will increase F, and since the stress σ=F/A, the increase of F will increase the stress σ. The problem of stress rise will directly affect the shrapnel of the linear vibration motor under the condition of reciprocating stroke, the faster the elastic component will be damaged due to fatigue.

Due to the above-mentioned fatigue failure reasons, the present invention needs to add a spring constant (Km ) to reduce the spring constant of the existing suspension device (that is, the leaf spring) from Ks to Ks', that is, Ks=Ks'+Km, so that Ks'<Ks, so as to reduce the stress The size of the target, thereby reducing the effect of fatigue damage to elastic components.

Therefore, as mentioned above, the present invention provides a magnetic recovery of the movable part relative to the fixed part when the movable part is displaced by forming a nearly closed magnetic circuit between the magnetically permeable component group and the magnet group. Force, so that the movable part returns to its mechanical origin; more specifically, the magnetic restoring force can be used as the spring constant (Km) in addition to the suspension device, so that the elastic system of the linear vibration motor does not need to rely entirely on the suspension device. Undertake the reciprocating action stroke.

Furthermore, when the distances between the end surfaces of the magnetic permeable component group and the magnet group are aligned (d=0), the magnetic return component of the fixed part can provide the magnetic restoring force of the magnet group of the movable part as zero; when the magnet group of the movable part is displaced to the right, the right end surface of the magnet group will be under the action of the magnetic attraction force generated by the magnetic field guidance on the right end surface of the magnet group and the right end surface of the magnetic permeable component group, making the magnet group of the movable part Generate a restoring force for leftward movement; otherwise, provide a corresponding restoring force in the opposite direction.

However, when the magnetic restoring force provided by the two sides of the magnetic permeable component group and the magnet group still cannot meet the design requirements of Km, under the premise that the magnet group contains at least three magnets, the present invention can start from the magnetic permeable component Holes are added to the design configuration, and the aforementioned magnetic attraction force can be changed by the design of this technical feature.

6A to 6C are schematic diagrams of holes provided on the magnetic permeable component of the linear vibration motor of the present invention. As shown in Figures 6A to 6C, the present invention can increase the required magnetic restoring force by increasing the X, Y direction end faces and the magnetic attraction generated by the magnet group by providing holes in the magnetic permeable component; moreover, setting The magnetic attraction force of the magnetically permeable component of the hole to the UZ direction will also be reduced, which can also achieve the effect of reducing the design requirement of Ks'. Furthermore, the desired magnetic attraction force can also be adjusted by changing the position and size of the holes. Among them, the X direction is defined as the length direction, the Y direction is defined as the width direction, and the direction perpendicular to the X-Y plane is the Z direction; c is the size of the hole in the X direction (length), L4 is the size of the hole in the Y direction (width), L3 is the size of the magnet group in the Y direction (width). Since the core technical feature of the present invention is to increase the required magnetic restoring force by increasing the X, Y direction end faces and the magnetic attraction force generated by the magnet group by setting holes in the magnetic permeable component, the definition and the holes will be in motion. The magnet that produces magnetic force change is the relative magnet in Z direction of this hole; The projection of the magnet in the Z direction should overlap the boundary of the hole.

As mentioned above, the location and size of the holes will affect the strength of the magnetic attraction. Figures 7A to 7F are schematic diagrams of various implementations of the magnetic permeable component under the condition that the hole width and external dimensions are fixed; Figures 8A to 8B show the magnetic restoring force in the X direction under the fixed hole width, respectively. , the schematic diagram of the relationship curve between the magnetic attraction force in the Z direction and the displacement distance of the magnet end face; Fig. 9A to Fig. 9H are schematic diagrams of various implementations of the magnetic permeable component under the condition that the hole length and the external dimension are fixed; Fig. 10A to 10B It is shown as a schematic diagram of the relationship curves of the magnetic restoring force in the X direction, the magnetic attraction force in the Z direction and the displacement distance of the end face of the magnet under a fixed hole length.

As shown in Fig. 7A to Fig. 7F and Fig. 8A to Fig. 8B, under the condition that the width of the hole and the external dimension of the magnetic permeable component are fixed, the size of the X direction is small (>0) to the size of the hole is 3 times that of the magnet in the Z direction of the hole. /4, both can increase the magnetic restoring force required for the relative motion direction. In addition, if the size of the hole is greater than 3/4 of the magnet in the Z direction of the hole, a reverse magnetic restoring force will be generated during the stroke. Figures 8A to 8B show the relationship between the magnetic restoring force in the X direction, the magnetic attraction force in the Z direction, and the displacement distance of the magnet end face; each curve has no holes, Type0 (hole length is 0.1mm), Type1 (hole length The size is 1/4 of the hole Z direction relative to the magnet), Type2 (the hole length is 2/4 of the hole Z direction relative to the magnet), Type3 (the hole length is 3/4 of the hole Z direction relative to the magnet), Type4 (hole The length and the width of the hole in the Z direction relative to the magnet) represent the size and configuration of the holes in FIGS. 7A to 7F respectively.

As shown in Figure 9A to Figure 9H and Figure 10A to Figure 10B, under the condition that the length of the hole and the external dimension of the magnetic permeable component are fixed, the size of the Y direction changes from small (>0) to the size of the hole in the Z direction relative to the magnet. 6/3, can increase the required magnetic restoring force relative to the direction of motion. Figure 10A to Figure 10B show the relationship between the magnetic restoring force in the X direction, the magnetic attraction force in the Z direction, and the displacement distance of the magnet end face; each curve has no holes, Type0 (hole width is 0.1mm), Type1 (hole width The size is 1/3 of the hole Z direction relative to the magnet), Type2 (the hole width is 2/3 of the hole Z direction relative to the magnet), Type3 (the hole width is equal to the hole Z direction relative to the magnet), Type4 (the hole width is 4/3 of the hole Z direction relative to the magnet), Type5 (the width of the hole is 5/3 of the hole Z direction relative to the magnet), Type6 (the hole width is 6/3 of the hole Z direction relative to the magnet) respectively represent Fig. 9A to Width size and configuration of holes in Figure 9H.

In other embodiments, the hole of the magnetic permeable component may be a groove-shaped hole that cuts off the upper or lower edge of the magnetic permeable component, so that the hole of the magnetic permeable component presents a groove shape. In other words, when the width L4 of the middle hole in the Y direction is larger than the width of the magnetic permeable component, it is a grooved hole; when the width L4 of the middle hole in the Y direction is smaller than the width of the magnetic permeable component, it is a closed hole. Wherein, the magnetic permeable component with the grooved hole can have both sides of the magnetic permeable component as end faces, and the end face of the grooved hole can also be used as the end face.

FIG. 11 is a schematic diagram of an embodiment of a magnetically conductive assembly with grooved holes in the linear vibration motor of the present invention. As shown in Fig. 11, in this embodiment, the upper magnetic permeable component and the lower magnetic permeable component of the magnetic permeable component group have different specifications; the upper magnetic permeable component has a closed hole, and the lower magnetic permeable component has Two wider closed holes and one narrower grooved hole are arranged between the two wider closed holes.

In other words, the Y-direction dimensions of the end faces of the upper and lower magnetic permeable components may be the same and symmetrical front and rear, or different and asymmetrical front and rear. Furthermore, the Y-direction dimensions of the end faces of the upper and lower magnetic permeable components can be the same and symmetrical, or different and asymmetrical. Alternatively, the X and Y dimensions of the perforated holes in the middle of the upper and lower magnetic components can be the same and symmetrical, or different and asymmetrical.

Similarly, in different embodiments, the hole patterns of the magnetic permeable components can be stacked to form a composite hole; One side and two sides are superimposed, and the final composite hole can be a closed hole or a grooved hole.

FIG. 12 is a schematic diagram of an embodiment of a magnetic permeable assembly with compound holes in the linear vibration motor of the present invention. As shown in Figure 12, in this embodiment, the upper magnetic permeable component and the lower magnetic permeable component of the magnetic permeable component group have different specifications; the upper magnetic permeable component has a closed composite hole, which consists of two closed The holes are compounded to form a T row of holes; and the lower magnetic permeable component has two wider closed holes, and a groove-type composite hole is arranged between the two wider closed holes, the groove The composite hole is composed of two closed holes and a grooved hole.

Furthermore, the dimensions of the composite holes in the X and Y directions may be the same and symmetrical, or different and asymmetrical. Furthermore, the dimensions of the composite holes in the X and Y directions may be the same and symmetrical, or different and asymmetrical.

To sum up, the linear vibration motor of the present invention will make the condition of Ks=Ks'+Km established by the magnetic restoring force formed by the leaf spring, the magnetic conductive component and the magnet group under certain conditions. Once Ks'<Ks, the It can reduce the spring constant of the leaf spring of the suspension device, so that the leaf spring can meet the rigid support strength in the UZ direction required by the increase of the magnetic permeable component, and avoid the problem of fatigue damage caused by excessive stress, without adding additional Support components.

However, the above-mentioned embodiments are only illustrative to illustrate the effects of the present invention, and are not intended to limit the present invention. Anyone skilled in this art can modify and change the above-mentioned embodiments without departing from the spirit and scope of the present invention. . In addition, the number of components in the above-mentioned embodiments is only for illustration, and is not intended to limit the present invention. Therefore, the protection scope of the present invention should be as listed in the scope of patent application above.

Claims (10)

1. A linear vibration motor, comprising: a movable part, a suspension device and a fixed part;

the movable part comprises at least one magnet group, the magnet group comprises at least three magnets which are arranged in a spaced mode, the magnetization directions of the magnets are up and down, the polarities of the adjacent magnets are opposite when the magnets are arranged, and the fixed part comprises at least one coil, at least one magnetic conduction assembly and a shell;

the magnet group of the movable part, the coil of the fixed part and the magnetic conduction assembly are arranged in opposite directions through gaps, the two side polar surfaces of the magnet group are opposite to the coil of the fixed part and the magnetic conduction assembly, the size of the magnetic conduction assembly of the fixed part in the non-moving direction is required to be larger than that of the magnet group in the non-moving direction, the at least one magnetic conduction assembly is positioned above or below the magnet group, and when the number of the at least one magnetic conduction assembly exceeds one, the magnetic conduction assemblies can be respectively arranged above and below the magnet group;

the suspension device comprises two sheet springs, wherein the two sheet springs are respectively positioned at two sides of the movable part, one side of each sheet spring is connected with the movable part, and the other side of each sheet spring is connected with the fixed part, so that the movable part is supported by the suspension device and moves freely relative to the fixed part, the height of the connecting end of each sheet spring is equal to the height of the connecting ends of the movable part and the fixed part, and the suspension device is in a straight sheet shape in an unactuated natural state and has no bending characteristic at the whole length of the sheet spring at the joint of the two sides.

2. The linear vibration motor according to claim 1, wherein the magnetic conductive member is provided with at least one hole, and a magnet which generates a magnetic force change when the hole is operated is defined as a Z-direction opposing magnet of the hole.

3. The linear vibration motor according to claim 2, wherein the hole is a rectangular hole, and four sides of the hole are parallel to four sides of the magnet set, respectively; and under the condition that the width dimension of the hole is fixed, the dimension of the length direction of the hole is not less than 0 and not more than 3/4 of the length of the Z direction of the hole relative to the magnet.

4. The linear vibration motor according to claim 2, wherein the hole is a rectangular hole, and four sides of the hole are parallel to four sides of the magnet set, respectively; and under the condition that the width dimension of the hole is fixed, the dimension of the length direction of the hole is not less than 0 and not more than 1/2 of the length of the Z direction of the hole relative to the magnet.

5. The linear vibration motor according to claim 2, wherein the hole is a rectangular hole, and four sides of the hole are parallel to four sides of the magnet set, respectively; and under the condition that the width dimension of the hole is fixed, the dimension of the Z direction of the hole relative to the length of the magnet is not more than 1/4 of the dimension of the length direction of the hole relative to the length of the magnet, and is not more than 1/2 of the dimension of the Z direction of the hole relative to the length of the magnet.

6. The linear vibration motor according to claim 2, wherein the hole is a rectangular hole, and four sides of the hole are parallel to four sides of the magnet set, respectively; and under the condition that the length dimension of the hole is fixed, the width dimension of the hole is not less than 0 and not more than the Z direction relative magnet width of the hole.

7. The linear vibration motor according to claim 2, wherein the hole is a rectangular hole, and four sides of the hole are parallel to four sides of the magnet set, respectively; and under the condition that the length dimension of the hole is fixed, the width dimension of the hole is not less than 0 and not more than 2/3 of the Z direction of the hole relative to the width of the magnet.

8. The linear vibration motor according to claim 2, wherein the hole is a rectangular hole, and four sides of the hole are parallel to four sides of the magnet set, respectively; and under the condition that the length dimension of the hole is fixed, the dimension of the Z direction of the hole relative to the width of the magnet is not more than 1/3 of the dimension of the Z direction of the hole relative to the width of the magnet.

9. The linear vibration motor of claim 2, wherein the hole is a groove-shaped hole that cuts off an upper edge or a lower edge of the magnetic conductive member so that the hole of the magnetic conductive member is in a groove shape; the magnetic conduction assembly with the groove type hole can be used as an end face from two sides of the magnetic conduction assembly, and can also be used as an end face from the end face of the groove type hole.

10. The linear vibration motor of claim 9, wherein the hole patterns of the magnetically permeable elements are stacked one above the other to form a composite hole; the composite hole is a union area formed by stacking two or more holes, the composite hole can be stacked on one side and two sides, and the final composite hole can be a closed hole or a groove hole.