WO2020129747A1

WO2020129747A1 - Linear vibration motor and electronic device using same

Info

Publication number: WO2020129747A1
Application number: PCT/JP2019/048241
Authority: WO
Inventors: 和英高田; 将充柴田
Original assignee: 株式会社村田製作所
Priority date: 2018-12-18
Filing date: 2019-12-10
Publication date: 2020-06-25
Also published as: JPWO2020129747A1; JP7207428B2

Abstract

Provided are a linear vibration motor capable of reducing the influence of a magnetic spring mechanism on the vibration of a vibrator, and an electronic device using the same. A linear vibration motor 100 is provided with: a housing 1; a vibrator 2 comprising a first magnet M1 and a second magnet M2; a coil 3 fixed to the housing 1 and configured to apply a drive force to the first magnet M1 so that the vibrator 2 can vibrate along a first direction D; a third magnet M3 fixed to the housing 1 at a position where the third magnet M3 and the second magnet M2 repel each other; and a fourth magnet M4 included in the vibrator 2 at a position where the fourth magnet M4 and the third magnet M3 repel each other. An interval L1 between the coil 3 and a first axial line A1 passing through the center of gravity of a surface of the first magnet M1 and parallel with the first direction D is shorter than an interval L2 between the coil 3 and a second axial line A2 passing through the center of gravity of a region in which the second magnet M2, the third magnet M3, and the fourth magnet M4 overlap each other and parallel with the first direction D.

Description

Linear vibration motor and electronic device using the same

This disclosure relates to a linear vibration motor and electronic equipment using the linear vibration motor.

An example of the linear vibration motor is the linear vibration motor described in US Patent Application Publication No. 2016/0226361 (Patent Document 1). FIG. 24 is a cross-sectional view of the linear vibration motor described in Patent Document 1. The linear vibration motor 300 includes a coil 303, a vibrator 302 including a first magnet M301, a second magnet M302, and a fourth magnet M304, a housing to which a third magnet M303 and a fifth magnet M305 are fixed. And 301.

The vibrator 302 includes a coil 303 and a first magnet M301 that functions as a driving magnet that gives a driving force along the first direction D when a current flows through the coil 303, and the vibrator 302 is arranged along the first direction D. Vibrate. The second magnet M302 and the third magnet M303, and the fourth magnet M304 and the fifth magnet M305 are arranged along the first direction D so as to repel each other. That is, the second magnet M302 and the third magnet M303, and the fourth magnet M304 and the fifth magnet M305 form a magnetic spring mechanism for the vibration of the vibrator 302 along the first direction D. There is.

By this magnetic spring mechanism, the vibration of the vibrator 302 is transmitted to the housing 301 via the third magnet M303 and the fifth magnet M305, and is sensed as the vibration of the linear vibration motor 300.

U.S. Patent Application Publication No. 2016/0226361

In the linear vibration motor 300, all the magnets are arranged on one axis parallel to the first direction D. That is, the distance between the second magnet M302 and the coil 303 is short. Therefore, when the vibrator 302 vibrates along the first direction D, the magnetic field of the second magnet M302 reduces the Lorentz force generated by the magnetic field of the first magnet M301 and the current flowing through the coil 303. Could give.

As a result, the force applied to the vibrator 302 as a reaction force of the Lorentz force is reduced, and the vibration of the linear vibration motor 300 by the vibrator 302 may be reduced. In addition, in an electronic device using the linear vibration motor 300, vibration for cutaneous sense feedback called haptics technology or for confirming key operation and incoming call may decrease.

That is, an object of this disclosure is to provide a linear vibration motor capable of suppressing the influence of the magnetic spring mechanism on the vibration, and an electronic device using the linear vibration motor.

With the linear vibration motor according to this disclosure, the arrangement of the magnets that make up the magnetic spring mechanism will be improved.

A linear vibration motor according to the present disclosure includes a first housing, a vibrator housed in the first housing, each of which includes at least one first and second magnet, and a vibrator fixed to the first housing. Is fixed to the first casing in a repulsive arrangement with a coil that applies a driving force to the first magnet so that the coil can vibrate along the first direction, and a second magnet along the first direction. In addition, the oscillator is arranged such that the third magnet is sandwiched between at least one third magnet and the second magnet along the first direction, and the third magnet is repulsive to each other. Or fixed to the first housing in such a manner that the second magnet is sandwiched between the third magnet and the third magnet along the first direction and in a repulsive arrangement with the second magnet. And a fourth magnet.

Then, when viewed from the first direction, the second to fourth magnets partially overlap each other. Further, the distance between the coil and the first axis passing through the center of gravity of the surface of the first magnet when viewed from the first direction and parallel to the first direction is the first distance when viewed from the first direction. It is shorter than the distance between the coil and the second axis parallel to the first direction and passing through the center of gravity of the region where the second to fourth magnets overlap each other.

Also, an electronic device according to this disclosure includes a linear vibration motor according to this disclosure and a second housing. The linear vibration motor is housed in the second housing.

The linear vibration motor according to this disclosure can suppress the influence on the vibration of the magnetic spring mechanism. Further, the electronic device according to the present disclosure uses the linear vibration motor according to the present disclosure, and thus it is possible to suppress a reduction in vibration due to the influence of the magnetic spring mechanism of the linear vibration motor.

FIG. 1A is a plan view of linear vibration motor 100 showing a schematic form of a linear vibration motor according to the present disclosure, excluding first portion 1 a of housing 1. FIG. 1B is a cross-sectional view of the linear vibration motor 100 taken along a plane including the line AA shown in FIG. FIG. 1C is a cross-sectional view of the linear vibration motor 100 taken along a plane including the line BB shown in FIG. FIG. 3 is an exploded perspective view of the linear vibration motor 100. 3A to 3D are cross-sectional views each illustrating a series of operations of the linear vibration motor 100 and corresponding to FIG. 1B. 4A to 4C are a plan view and a cross-sectional view of a linear vibration motor 100A, which is a first modification of the linear vibration motor 100, corresponding to FIGS. 1A to 1C. .. 5A to 5C are a plan view and a sectional view taken in the direction of an arrow of a linear vibration motor 100B, which is a second modification of the linear vibration motor 100, corresponding to FIGS. 1A to 1C. .. It is an exploded perspective view of linear vibration motor 100B. 7A to 7C are a plan view and a cross-sectional view taken in the direction of an arrow of a linear vibration motor 100C, which is a third modification of the linear vibration motor 100, corresponding to FIGS. 1A to 1C. .. 8A to 8C are a plan view and a cross-sectional view of a linear vibration motor 100D, which is a fourth modified example of the linear vibration motor 100, corresponding to FIGS. 1A to 1C. .. 9A to 9C are a plan view and a cross-sectional view taken in the direction of an arrow of a linear vibration motor 100E, which is a fifth modification of the linear vibration motor 100, corresponding to FIGS. 1A to 1C. .. 10A to 10C are a plan view and a cross-sectional view taken in the direction of an arrow of a linear vibration motor 100F, which is a sixth modification of the linear vibration motor 100, corresponding to FIGS. 1A to 1C. .. 11A to 11C are a plan view and a cross-sectional view taken in the direction of an arrow of a linear vibration motor 100G, which is a 76th modification of the linear vibration motor 100, corresponding to FIGS. 1A to 1C. .. 12A to 12C are a plan view and a sectional view taken in the direction of an arrow of a linear vibration motor 100H that is an eighth modification of the linear vibration motor 100, corresponding to FIGS. 1A to 1C. .. 13A to 13C are a plan view and a cross-sectional view taken in the direction of an arrow of a linear vibration motor 100I, which is a ninth modification of the linear vibration motor 100, corresponding to FIGS. 1A to 1C. .. 14A to 14C are a plan view and a cross-sectional view taken in the direction of an arrow of a linear vibration motor 100J, which is a tenth modified example of the linear vibration motor 100, corresponding to FIGS. 1A to 1C. .. 15A to 15C are a plan view and a cross-sectional view taken in the direction of an arrow of a linear vibration motor 100K that is an eleventh modified example of the linear vibration motor 100, corresponding to FIGS. 1A to 1C. .. FIG. 16A is a plan view of linear vibration motor 200 showing an embodiment of a linear vibration motor according to the present disclosure, excluding first portion 1 a of housing 1. 16B is a cross-sectional view of the linear vibration motor 200 taken along the plane including the line AA shown in FIG. FIG. 16C is a cross-sectional view of the linear vibration motor 200 taken along a plane including the line BB shown in FIG. 3 is an exploded perspective view of the linear vibration motor 200. FIG. 18A to 18C are a plan view and a cross-sectional view taken in the direction of an arrow of a linear vibration motor 200A, which is a first modification of the linear vibration motor 200, corresponding to FIGS. 16A to 16C. .. It is an exploded perspective view of linear vibration motor 200A. 20A to 20C are a plan view and a cross-sectional view taken along the arrow of a linear vibration motor 200B that is a second modification of the linear vibration motor 200 and correspond to FIGS. 16A to 16C. .. It is a disassembled perspective view of the linear vibration motor 200B. FIG. 25 is a transparent perspective view of a portable information terminal 1000 that is a schematic form of an electronic device according to the present disclosure. 3 is a cross-sectional view of a main part of portable information terminal 1000. FIG. It is a sectional view of linear vibration motor 300 of background art.

The features of this disclosure will be described with reference to the drawings. In the schematic modes and embodiments of the linear vibration motor described below, the same or common portions are denoted by the same reference numerals in the drawings, and the description thereof may not be repeated.

-Schematic form of linear vibration motor-
A linear vibration motor 100 showing a schematic form of a linear vibration motor according to this disclosure will be described with reference to FIGS. 1 and 2.

FIG. 1A is a plan view of the linear vibration motor 100 excluding a first portion 1 a (described later) of the housing 1. FIG. 1B is a cross-sectional view of the linear vibration motor 100 taken along a plane including the line AA shown in FIG. FIG. 1C is a cross-sectional view of the linear vibration motor 100 taken along a plane including the line BB shown in FIG. Further, FIG. 2 is an exploded perspective view of the linear vibration motor 100.

As shown in FIGS. 1 and 2, the linear vibration motor 100 includes a housing 1 (first housing), a vibrator 2, a coil 3, and a third magnet M3.

The housing 1 includes a first portion 1a and a second portion 1b, and has inner walls W1 to W4. In the linear vibration motor 100, the first portion 1a is a flat plate-shaped lid portion and the second portion 1b is a container portion. That is, the housing 1 has a closed structure, but the shape is not limited to this. For example, the housing 1 may have a tubular shape and may partially have an opening. The second portion 1b includes a container body 1b1 and a fixed portion 1b2 as described later, but the fixed portion 1b2 is not shown (the same applies hereinafter).

The inner wall W1 corresponds to the bottom surface of the housing 1 shown in FIG. 1B, and the inner wall W2 corresponds to the top surface of the housing 1 facing the inner wall W1. The inner walls W3 and W4 correspond to the side wall surfaces of the housing 1 shown in FIG. 1(B).

The oscillator 2 is housed in the second portion 1b of the housing 1. In the linear vibration motor 100, the vibrator 2 includes two first magnets M1, a second magnet M2, a fourth magnet M4, and a substrate 2a. The two first magnets M1 are fixed to the central portion of the substrate 2a at intervals along the first direction D so as to face the winding portions of the coil 3 described later. The two first magnets M1 are arranged so that the arrangement directions of the magnetic poles are parallel to the winding axis of the coil 3 and opposite to each other.

In FIG. 1B, of the two first magnets M1, the S pole of one of the first magnets M1 faces the winding portion of the coil 3, and the N pole of the other first magnet M1 is the coil. It faces the winding part of No. 3. With such an arrangement, the Lorentz force applied to the coil 3 described later can be increased. The winding axis of the coil 3 is a virtual axis. The coil 3 is formed by winding a conductor wire around its winding axis.

In the linear vibration motor 100, the two first magnets M1 have the same shape. That is, the two first magnets M1 appear to overlap each other when viewed from the first direction D. However, the shape of the first magnet M1 is not limited to this. The first magnet M1 may be only one.

When the coil 3 is energized, it gives a driving force to the first magnet M1 so that the vibrator 2 can vibrate along the first direction D. In FIG. 1 and FIG. 2, the winding of the coil 3 and the energization path (wiring path) to the coil 3 are not shown. In the linear vibration motor 100, the coil 3 has a casing in which the winding axis is parallel to the normal direction of the first portion 1a of the casing 1, that is, the winding axis is orthogonal to the first direction D. 1 is fixed to the inner wall W2. The shape of the coil 3 when viewed from the winding axis direction is a rectangular shape with rounded corners.

When an electric current flows through the coil 3, a Lorentz force is applied to the coil 3 by the magnetic field of the first magnet M1 in a direction orthogonal to the direction of the magnetic field and the direction in which the current flows. On the other hand, since the coil 3 is fixed to the housing 1, a reaction force of the Lorentz force is applied to the first magnet M1. Therefore, the coil 3 applies a driving force along the first direction D to the first magnet M1 and thus to the vibrator 2 by energization. That is, the first magnet M1 functions as a drive magnet in the linear vibration motor 100.

As described above, when the shape of the coil 3 when viewed from the winding axis direction is rectangular, the direction of the Lorentz force described above is more aligned with the first direction D than when the coil 3 is annular. Cheap. Therefore, the driving force applied to the vibrator 2 along the first direction D becomes large, which is preferable.

The second magnet M2 is arranged such that the arrangement direction of the magnetic poles is parallel to the first direction D and repels a third magnet M3 described later, and is fixed to one end of the substrate 2a. Here, in order to avoid the collision between the vibrator 2 and the housing 1, the second magnet M2 has a distance between the second magnet M2 and the third magnet M3 before vibration from the end surface of the substrate 2a and the housing 1 so as to avoid collision. It is fixed to the substrate 2a so as to be equal to or less than the interval. In this case, the magnetic spring mechanism works effectively. From the viewpoint of miniaturization, it is preferable that the distance between the second magnet M2 and the third magnet M3 before vibration is the same as the distance between the end surface of the substrate 2a and the housing 1.

As described above, the third magnet M3 is arranged such that the arrangement direction of the magnetic poles is parallel to the first direction D and repels the second magnet M2 along the first direction D, and the third magnet M3 has an inner wall of the housing 1. It is fixed to W1.

The fourth magnet M4 is fixed to the substrate 2a of the vibrator 2 in such an arrangement that the arrangement direction of the magnetic poles is parallel to the first direction D and repulsive to the third magnet M3 along the first direction D. ing. Similarly to the second magnet M2, the distance between the fourth magnet M4 and the third magnet M3 before vibration of the fourth magnet M4 is equal to or less than the distance between the end surface of the substrate 2a and the housing 1. , Preferably fixed to the substrate 2a at the same intervals.

As shown in FIG. 1A, the second magnet M2 and the fourth magnet M4 are arranged on the same axis so as to sandwich the third magnet M3 in a plan view. Further, as shown in FIG. 1B, the N pole of the third magnet M3 and the N pole of the second magnet M2 are opposed to each other, and the S pole of the third magnet M3 and the fourth pole of the third magnet M3 are opposed to each other. The south pole of the magnet M4 faces each other. As a result, the second magnet M2, the third magnet M3, and the fourth magnet M4 form a magnetic spring mechanism for vibration of the vibrator 2 in the first direction D.

When viewed from the first direction D, the second magnet M2, the third magnet M3, and the fourth magnet M4 partially overlap each other. Here, an axis line that passes through the center of gravity of the overlapping region of the two first magnets M1 when viewed from the first direction D and is parallel to the first direction D is referred to as a first axis line A1. As described above, since the two first magnets M1 have the same shape, the center of gravity of the overlapping region of the two first magnets M1 is equal to the center of gravity of the surface of the first magnet M1. When viewed from the first direction D, the second magnet M2, the third magnet M3, and the fourth magnet M4 pass through the center of gravity of a region where they overlap with each other, and an axis line parallel to the first direction D Let it be the second axis A2.

When defined as above, the distance L1 between the first axis A1 and the coil 3 is shorter than the distance L2 between the second axis A2 and the coil 3.

Here, the center of gravity of the surface of the first magnet M1 refers to the center of gravity of the figure represented by the outer circumference of the first magnet M1 when viewed from the first direction. The center of gravity of the region where the second magnet M2, the third magnet M3, and the fourth magnet M4 overlap each other is represented by the outer circumference of the region where the respective magnets overlap each other when viewed from the first direction. The center of gravity of the figure. The distance between each axis and the coil means the distance between each axis and the tip of the coil 3 on the side far from the housing 1.

In the linear vibration motor 100, the first magnet M1 that is the driving magnet of the vibrator 2 and the second magnet M2, the third magnet M3, and the fourth magnet M4 that form the magnetic spring mechanism form one axis. Not placed on the line. That is, the first axis A1 passing through the drive magnet and the second axis A2 passing through the magnetic spring mechanism are separated from each other, and the second axis A2 is located farther from the coil 3 than the first axis A1. is there.

Here, the operation of the linear vibration motor 100 will be described with reference to FIG. 3A to 3D are cross-sectional views each illustrating a series of operations of the linear vibration motor 100 and corresponding to FIG. 1B.

FIG. 3(A) shows a state where the vibrator 2 is not vibrating and the coil 3 is energized. Here, the symbol attached to the cross section on the left side of the coil 3 indicates that the current flows from the back side to the front side in the drawing. Similarly, the symbol attached to the cross section on the right side of the coil 3 indicates that the current flows from the front side to the back side in the drawing. Further, the upward arrow coming out from the N pole of the first magnet M1 and the downward arrow coming into the S pole represent the direction of the magnetic field generated by the first magnet M1.

When a current flows through the coil 3 in the above-described direction, the magnetic field of the first magnet M1 causes a Lorentz force (a thinly-painted area in the figure) in a direction orthogonal to the direction of the magnetic field and the direction in which the current flows. The right-pointing arrow) is added. On the other hand, since the coil 3 is fixed to the housing 1, a reaction force of the Lorentz force (a dark arrow pointing to the left in the figure) is applied to the first magnet M1. Therefore, a driving force that moves the vibrator 2 to the left side in the drawing along the first direction D is applied to the vibrator 2.

In this state, the second axis A2 passing through each magnet constituting the magnetic spring mechanism is located farther from the coil 3 than the first axis A1 passing through the first magnet M1 which is a driving magnet of the vibrator 2. It is in. That is, the influence of the magnetic fields of the second magnet M2 and the fourth magnet M4 on the Lorentz force applied to the coil 3 is suppressed.

FIG. 3B shows a state in which the direction of the current flowing through the coil 3 is reversed after the vibrator 2 moves to the left side in the figure. When the vibrator 2 moves to the left, the fourth magnet M4 of the vibrator 2 and the third magnet M3 fixed to the second portion 1b of the housing 1 approach each other, and the repulsive force between them increases. .. As a result, a force for moving the fourth magnet M4 to the right side in the figure (white arrow pointing to the right in the figure) is applied to the fourth magnet M4. On the other hand, a force for moving the third magnet M3 to the left side in the drawing (white arrow pointing to the left in the drawing) is applied to the third magnet M3. Then, the force applied to the third magnet M3 deforms the second portion 1b of the housing 1 to which the third magnet M3 is fixed. The modification shown in FIG. 3B is schematically represented (the same applies hereinafter).

Then, when the direction of the current flowing through the coil 3 is reversed, the Lorentz force in the direction opposite to the direction shown in FIG. 3(A) is applied to the coil 3. However, the area where the winding portion of the coil 3 and the first magnet M1 overlap with each other when viewed from the winding axis direction of the coil 3 is smaller than that shown in FIG. The magnitude of the Lorentz force that occurs is small (the lightly-filled small arrow pointing to the left in the figure). Then, the reaction force of this Lorentz force is applied to the first magnet M1 (small arrow pointing to the right in the drawing, which is darkly filled).

Therefore, the driving force that moves the vibrator 2 to the right side in the drawing along the first direction D is applied to the vibrator 2 by the above-mentioned force applied to the fourth magnet M4 and the reaction force of the Lorentz force. ..

Even in this state, the second axis A2 passing through each magnet constituting the magnetic spring mechanism is farther from the coil 3 than the first axis A1 passing through the first magnet M1 which is a driving magnet of the vibrator 2. In position. That is, the influence of the magnetic field of the fourth magnet M4 on the Lorentz force applied to the coil 3 is suppressed.

FIG. 3C shows a state in which the direction of the current flowing through the coil 3 is reversed after the vibrator 2 moves to the right side in the figure. When the oscillator 2 moves to the right, the second magnet M2 of the oscillator 2 and the third magnet M3 fixed to the second portion 1b of the housing 1 approach each other, and the repulsive force between them increases. .. As a result, a force that moves the second magnet M2 to the left side in the figure (white arrow pointing to the left in the figure) is applied to the second magnet M2. On the other hand, a force (white arrow pointing to the right in the figure) that moves the third magnet M3 to the right side in the figure is applied to the third magnet M3. Then, the force applied to the third magnet M3 deforms the second portion 1b of the housing 1 to which the third magnet M3 is fixed, in the direction opposite to that in the case of FIG. 3B.

Then, when the direction of the current flowing through the coil 3 is reversed, a Lorentz force in the direction opposite to the direction shown in FIG. 3B is applied to the coil 3. Similar to the state shown in FIG. 3(B), the magnitude of the generated Lorentz force is small (the thin arrow pointing to the right, which is lightly painted). Then, the reaction force of the Lorentz force is applied to the first magnet M1 (small arrow pointing to the left, which is darkly filled in the figure).

Therefore, the driving force that moves the vibrator 2 to the left side in the drawing along the first direction D is given to the vibrator 2 by the above-mentioned force applied to the second magnet M2 and the reaction force of the Lorentz force. ..

Even in this state, the second axis A2 passing through each magnet constituting the magnetic spring mechanism is farther from the coil 3 than the first axis A1 passing through the first magnet M1 which is a driving magnet of the vibrator 2. In position. That is, the influence of the magnetic field of the second magnet M2 on the Lorentz force applied to the coil 3 is suppressed.

FIG. 3(D) shows that the oscillator 2 is brought into the same state as FIG. 3(B) by the operation described in FIG. 3(C). That is, the influence of the magnetic field of the fourth magnet M4 on the Lorentz force applied to the coil 3 is suppressed. Further, the second portion 1b of the housing 1 to which the third magnet M3 is fixed is deformed in the same direction as in the case of FIG. 3(B). The vibration of the vibrator 2 along the first direction D described above becomes the vibration of the third magnet M3 forming the magnetic spring mechanism, is transmitted to the housing 1, and becomes the vibration of the linear vibration motor 100.

Therefore, in the linear vibration motor 100, when the vibrator 2 vibrates in the first direction D, it is possible to suppress the influence of the magnetic field of the magnets forming the magnetic spring mechanism on the Lorentz force applied to the coil 3. it can. As a result, it is possible to suppress a decrease in the force applied to the vibrator 2 as a reaction force of the Lorentz force, and it is possible to suppress a decrease in vibration of the linear vibration motor 100.

Since the vibrator 2 can vibrate along the first direction D, the structure in which the vibrator 2 is supported in the second portion 1b of the housing 1 is not particularly limited. As an example, in the linear vibration motor 100, as shown in FIGS. 1 and 2, the vibrator 2 includes the sliding mechanism 4 including the first sliding mechanism 4a and the second sliding mechanism 4b. It is supported.

In the linear vibration motor 100, the vibrator 2 is connected to the inner wall W3 of the housing 1 by the first sliding mechanism 4a, and is connected to the inner wall W4 of the housing 1 by the second sliding mechanism 4b. The structure of the sliding mechanism 4 is not particularly limited. As an example, as shown in FIG. 1C, a sliding body that includes a guide rail and a moving body using a ball bearing or the like, and has reduced friction during movement of the moving body on the guide rail. Mechanisms can be used. The guide rail is fixed to the housing 1 side, and the moving body is fixed to the vibrator 2 side.

-First Modification of Schematic Form of Linear Vibration Motor-
A linear vibration motor 100A that is a first modification of the linear vibration motor 100 that is a schematic form of the linear vibration motor according to this disclosure will be described with reference to FIG.

4A to 4C are a plan view and a cross-sectional view of the linear vibration motor 100A corresponding to FIGS. 1A to 1C, respectively. The linear vibration motor 100A is different from the linear vibration motor 100 in the number and arrangement of the second magnet M2, the third magnet M3, and the fourth magnet M4. The other configurations are similar to those of the linear vibration motor 100, and thus the duplicate description will be omitted.

In the linear vibration motor 100A, the second magnet M2, the third magnet M3, and the fourth magnet M4 each include two magnets having the same shape. When viewed from the first direction D, one part of one of the second magnet M2, the third magnet M3, and the fourth magnet M4 overlaps. The other part of the second magnet M2, the third magnet M3, and the fourth magnet M4 overlap.

That is, in the linear vibration motor 100A, two magnetic spring mechanisms are arranged in parallel. Therefore, there are two second axis lines A2, which are axis lines parallel to the first direction D and passing through the center of gravity of the region where the second magnet M2, the third magnet M3, and the fourth magnet M4 overlap each other.

In the linear vibration motor 100A as well, similar to the linear vibration motor 100, when the vibrator 2 vibrates along the first direction D, the magnetic field of the magnet that constitutes the magnetic spring mechanism becomes the Lorentz force applied to the coil 3. The influence exerted can be suppressed.

Further, in the linear vibration motor 100A, as described above, the two magnetic spring mechanisms are arranged in parallel. Therefore, it is possible to suppress the influence of an error in the mounting position of each magnet of the magnetic spring mechanism.

-Second Modification of Schematic Form of Linear Vibration Motor-
A linear vibration motor 100B that is a second modification of the linear vibration motor 100 that is a schematic form of the linear vibration motor according to this disclosure will be described with reference to FIGS. 5 and 6.

5A to 5C are a plan view and a cross-sectional view taken along the arrow of the linear vibration motor 100B corresponding to FIGS. 1A to 1C. Further, FIG. 6 is an exploded perspective view of the linear vibration motor 100B. The linear vibration motor 100B is different from the linear vibration motor 100 in the positional relationship among the second magnet M2, the third magnet M3, and the fourth magnet M4. The other configurations are similar to those of the linear vibration motor 100, and thus the duplicate description will be omitted.

In the linear vibration motor 100B, as shown in FIG. 5A, the second magnet M2 is fixed to the central portion of the substrate 2a so that the arrangement direction of the magnetic poles is parallel to the first direction D. Has been done. The third magnet M3 and the fourth magnet M4 are arranged such that the second magnet M2 is sandwiched between the third magnet M3 and the fourth magnet M2 and the magnetic poles repel each other with the second magnet M2. It is fixed to the portion 1b.

Here, like the linear vibration motor 100, the third magnet M3 has a distance between the second magnet M2 and the third magnet M3 before vibration in order to avoid collision between the vibrator 2 and the housing 1. It is fixed to the substrate 2a such that the distance between the end surface of the substrate 2a and the housing 1 is equal to or less than the distance between the substrate 1 and the casing 1. In this case, the magnetic spring mechanism works effectively. From the viewpoint of miniaturization, it is preferable that the distance between the second magnet M2 and the third magnet M3 before vibration is the same as the distance between the end surface of the substrate 2a and the housing 1.

Similarly to the third magnet M3, the distance between the fourth magnet M4 and the third magnet M3 before vibration is less than or equal to the distance between the end surface of the substrate 2a and the housing 1 as well as the third magnet M3. Thus, it is preferably fixed to the substrate 2a at the same intervals.

That is, as shown in FIG. 5B, the N pole of the second magnet M2 and the N pole of the third magnet M3 face each other, and the S pole of the second magnet M2 and the fourth pole of the third magnet M3 face each other. The south pole of the magnet M4 faces each other. As a result, the second magnet M2, the third magnet M3, and the fourth magnet M4 form a magnetic spring mechanism for vibration of the vibrator 2 in the first direction D.

When viewed from the first direction D, the second magnet M2, the third magnet M3, and the fourth magnet M4 partially overlap each other, as in the linear vibration motor 100.

In the linear vibration motor 100B as well, when the vibrator 2 vibrates along the first direction D, the magnetic field of the magnets forming the magnetic spring mechanism becomes the Lorentz force applied to the coil 3 as in the linear vibration motor 100. The influence exerted can be suppressed.

The linear vibration motor 100B, like the linear vibration motor 100A, includes two magnets in which the second magnet M2, the third magnet M3, and the fourth magnet M4 have the same shape. Good.

-Third Modification of Schematic Form of Linear Vibration Motor-
A linear vibration motor 100C that is a third modification of the linear vibration motor 100 that is a schematic form of the linear vibration motor according to this disclosure will be described with reference to FIG.

7(A) to (C) are a plan view and a cross-sectional view taken in the direction of the arrow of the linear vibration motor 100C corresponding to FIGS. 1(A) to (C). The linear vibration motor 100C differs from the linear vibration motor 100 in that it further includes a fifth magnet M5. The other configurations are similar to those of the linear vibration motor 100, and thus the duplicate description will be omitted.

The linear vibration motor 100C further includes a fifth magnet M5 as a drive magnet in addition to the first magnet M1. As shown in FIGS. 7A and 7B, the fifth magnet M5 has a magnetic pole array direction parallel to the first direction D and is sandwiched between the two first magnets M1. Thus, it is fixed to the central portion of the substrate 2a.

As described above, the two first magnets M1 are arranged such that the arrangement directions of the magnetic poles are parallel to the winding axis of the coil 3, that is, orthogonal to the first direction D and opposite to each other. Has been done. In addition, the fifth magnet M5 is a driving magnet in which the magnetic field of the array of magnets formed by the two first magnets M1 and the fifth magnet M5 is a driving magnet including the first magnet M1 and the fifth magnet M5. It is arranged so as to concentrate between the coil 3 and the coil 3.

Specifically, the magnetic pole of one of the two first magnets M1 (first left-side first magnet M1 in FIG. 7) has an S pole on the side facing the coil 3 and an N pole on the side facing the substrate 2a. is there. The other magnetic pole of the two first magnets M1 (the first magnet M1 on the right side in FIG. 7) has the N pole on the side facing the coil 3 and the S pole on the side facing the substrate 2a. The magnetic pole of the fifth magnet M5 has an S pole on the side facing one of the two first magnets M1 and an N pole on the side facing the other.

In this disclosure, the array of each magnet of the drive magnet, which can concentrate the magnetic field by the drive magnet between the drive magnet and the coil that drives the vibrator, is broadly called the Halbach array. The number of magnets forming the Halbach array may be an odd number of 3 or more.

In the linear vibration motor 100C as well as in the linear vibration motor 100, when the vibrator 2 vibrates along the first direction D, the magnetic field of the magnet forming the magnetic spring mechanism is changed to the Lorentz force applied to the coil 3. The influence exerted can be suppressed.

In addition, in the linear vibration motor 100C, by adding the fifth magnet M5 to the drive magnet, the magnetic field generated by the drive magnet is concentrated between the drive magnet and the coil 3, and the drive magnet is only the first magnet M1. The magnetic field acting on the coil 3 can be strengthened more than in the case. Therefore, the Lorentz force applied to the coil 3 can be increased. As a result, the force applied to the vibrator 2 as a reaction force of the Lorentz force can be increased, and the vibration of the linear vibration motor 100 by the vibrator 2 can be increased.

Note that, like the linear vibration motor 100A, the linear vibration motor 100C is configured such that the second magnet M2, the third magnet M3, and the fourth magnet M4 each include two magnets having the same shape. Good. Further, the linear vibration motor 100C may have a magnetic spring structure like the linear vibration motor 100B.

-Fourth Modification of Schematic Form of Linear Vibration Motor-
A linear vibration motor 100D that is a fourth modification of the linear vibration motor 100 that is a schematic form of the linear vibration motor according to the present disclosure will be described with reference to FIG.

8(A) to 8(C) are a plan view and a cross-sectional view of the linear vibration motor 100D corresponding to FIGS. 1(A) to (C), respectively. The linear vibration motor 100D is different from the linear vibration motor 100 in the number of the second magnets M2, the third magnets M3, and the fourth magnets M4, and the positional relationship. The other configurations are similar to those of the linear vibration motor 100, and thus the duplicate description will be omitted.

In the linear vibration motor 100D, the second magnet M2, the third magnet M3, and the fourth magnet M4 each include two magnets having the same shape. Recesses are formed on one side surface (side surface facing the inner wall W3) and the other side surface (side surface facing the inner wall W4) of the substrate 2a.

One of the two second magnets M2 is arranged in a concave portion formed on one side surface of the substrate 2a, and the other is arranged in a concave portion formed on the other side surface of the substrate 2a. One of the two fourth magnets M4 is also arranged in a recess formed on one side surface of the substrate 2a, and the other is arranged in a recess formed on the other side surface of the substrate 2a.

A part of one of the third magnets M3 is inserted into the concave portion on the one side surface side of the substrate 2a. Then, when viewed from the first direction D, one of the third magnets M3 is arranged so as to face one of the second magnet M2 and one of the fourth magnets M4, respectively, and the second portion of the housing 1 is arranged. It is fixed to 1b. In addition, a part of the other of the two third magnets M3 is inserted into the concave portion on the other side surface side of the substrate 2a. When viewed from the first direction D, the second magnet M2 and the fourth magnet M4 are fixed to the second portion 1b of the housing 1 so as to face each other.

When viewed from the first direction D, one part of the second magnet M2, the third magnet M3, and the fourth magnet M4 overlap each other. Moreover, the other part of the second magnet M2, the third magnet M3, and the fourth magnet M4 overlap each other.

That is, also in the linear vibration motor 100D, two magnetic spring mechanisms are arranged in parallel. Therefore, there are two second axis lines A2, which are axis lines parallel to the first direction D and passing through the center of gravity of the region where the second magnet M2, the third magnet M3, and the fourth magnet M4 overlap each other.

In the linear vibration motor 100D as well as in the linear vibration motor 100, when the vibrator 2 vibrates along the first direction D, the magnetic field of the magnet forming the magnetic spring mechanism is changed to the Lorentz force applied to the coil 3. The influence exerted can be suppressed. Further, since the two magnetic spring mechanisms are arranged in parallel, it is possible to suppress the influence of an error in the mounting position of each magnet of the magnetic spring mechanism. Furthermore, since each magnet forming the magnetic spring mechanism is provided on the side surface of the substrate 2a, the height of the linear vibration motor 100D can be reduced.

Like the linear vibration motor 100C, the linear vibration motor 100D further includes a fifth magnet, and is provided between the coil 3 and the drive magnet configured by the two first magnets M1 and the fifth magnet M5. The magnetic field generated by the driving magnet may be concentrated. Further, the linear vibration motor 100D may have a magnetic spring structure like the linear vibration motor 100B.

-Fifth Modification of Schematic Form of Linear Vibration Motor-
A linear vibration motor 100E that is a fifth modification of the linear vibration motor 100 that is a schematic form of the linear vibration motor according to this disclosure will be described with reference to FIG.

9A to 9C are a plan view and a cross-sectional view of the linear vibration motor 100E corresponding to FIGS. 1A to 1C, respectively. The linear vibration motor 100E is different from the linear vibration motor 100B of the second modification in the form of the first magnet M1 and the second magnet M2. The other configurations are the same as those of the linear vibration motor 100B, and thus redundant description will be omitted.

In the linear vibration motor 100E, the two first magnets M1 penetrate the substrate 2a, and the first portion on the inner wall W2 side of the housing 1 and the second portion on the inner wall W1 side of the housing 1 described above. And a part. The two first magnets M1 are arranged such that the arrangement directions of the magnetic poles are parallel to the winding axis of the coil 3 and opposite to each other. That is, the first portion of the first magnet M1 functions as a drive magnet as in the linear vibration motor 100.

When viewed from the first direction D, one second portion of the two first magnets M1 and a portion of the third magnet M3 overlap each other, and the other second portion No. 4 magnet M4 partially overlaps. The second portion on one side and the third magnet M3 are arranged so as to repel each other, and the second portion on the other side and the fourth magnet M4 are arranged so as to repel each other.

As a result, the respective second portions of the two first magnets M1, the third magnet M3, and the fourth magnet M4 constitute a magnetic spring mechanism for the vibration of the vibrator 2 along the first direction D. doing. That is, in the linear vibration motor 100E, a part of the first magnet M1 is the second magnet M2.

Here, like the linear vibration motor 100, the first axis A1 passes through the center of gravity of the overlapping region of the two first magnets M1 when viewed from the first direction D, and goes in the first direction D. Use parallel axes. The second axis A2 is a region where the second portions of the two first magnets M1, the third magnet M3, and the fourth magnet M4 overlap each other when viewed in the first direction D. Is an axis line passing through the center of gravity of and parallel to the first direction D. When defined as described above, the distance L1 between the first axis A1 and the coil 3 is shorter than the distance L2 between the second axis A2 and the coil 3.

Also in the linear vibration motor 100E, when the vibrator 2 vibrates along the first direction D, the magnetic field of the magnet forming the magnetic spring mechanism is changed to the Lorentz force applied to the coil 3 as in the linear vibration motor 100. The influence exerted can be suppressed.

Further, in the linear vibration motor 100E, as described above, a part of the first magnet M1 is the second magnet M2 in the linear vibration motor 100B. Therefore, the number of magnets forming the linear vibration motor 100E can be reduced.

In the linear vibration motor 100E, one and the other of the two first magnets M1 are plural respectively, and the third magnet M3 and the fourth magnet M4 have the same shape corresponding to them respectively. It may include a plurality of magnets.

-Sixth Modification of Schematic Form of Linear Vibration Motor-
A linear vibration motor 100F that is a sixth modification of the linear vibration motor 100 that is a schematic form of the linear vibration motor according to the present disclosure will be described with reference to FIG.

10(A) to (C) are a plan view and a sectional view taken along the arrow of the linear vibration motor 100F corresponding to FIGS. 1(A) to (C). The linear vibration motor 100F is different from the linear vibration motor 100E which is the fifth modification in the form of the first magnet M1 and the second magnet M2. The other configurations are the same as those of the linear vibration motor 100E, and thus redundant description will be omitted.

In the linear vibration motor 100F, similarly to the linear vibration motor 100E, the two first magnets M1 penetrate the substrate 2a, and the first portion on the inner wall W2 side of the housing 1 and the housing 1 described above. And a second portion on the inner wall W1 side. However, as shown in FIG. 10B, the first magnet M1 in the linear vibration motor 100F is bent so that the first portion and the second portion form an L shape. In addition, it is preferable that the first magnet M1 is sharpened and smoothly bent.

The magnetic poles of the first parts of the two first magnets M1 are arranged in parallel with the winding axis of the coil 3 and in opposite directions. In FIG. 10B, in one of the two first portions, the S pole faces the winding portion of the coil 3, and in the other of the two first portions, the N pole is the winding portion of the coil 3. Facing each other. That is, the first portion of the first magnet M1 functions as a drive magnet as in the linear vibration motor 100.

Then, when viewed from the first direction D, the second portion of one of the two first magnets M1 and a portion of the third magnet M3 overlap each other, and the second portion of the other one and the fourth portion of the third magnet M3 overlap. Part of the magnet M4 of the above is overlapped. Further, the second portion and the third magnet M3 of one of the two first magnets M1 are arranged to repel each other, and the other second portion and the fourth magnet M4 repel each other. It is arranged. In FIG. 10B, in one of the two second portions, the N pole faces the N pole of the third magnet M3, and on the other side, the S pole faces the S pole of the fourth magnet M4. There is.

As a result, the respective second portions of the two first magnets M1, the third magnet M3, and the fourth magnet M4 form a magnetic spring mechanism for the vibration of the vibrator 2 along the first direction D. doing. That is, also in the linear vibration motor 100F, as in the linear vibration motor 100E, a part of the first magnet M1 is the second magnet M2.

Here, the first axis A1 and the second axis A2 are defined similarly to the linear vibration motor 100E. The distance L1 between the first axis A1 and the coil 3 is shorter than the distance L2 between the second axis A2 and the coil 3.

Also in the linear vibration motor 100F, when the vibrator 2 vibrates along the first direction D, the magnetic field of the magnets forming the magnetic spring mechanism is changed to the Lorentz force applied to the coil 3 as in the linear vibration motor 100. The influence exerted can be suppressed. Further, in the linear vibration motor 100F, the number of magnets forming the linear vibration motor 100F can be reduced as in the linear vibration motor 100E.

Also in the linear vibration motor 100F, one and the other of the two first magnets M1 are plural respectively, and the third magnet M3 and the fourth magnet M4 have the same shape corresponding to them respectively. It may include a plurality of magnets.

-Seventh Modification of Schematic Form of Linear Vibration Motor-
A linear vibration motor 100G that is a seventh modification of the linear vibration motor 100 that is a schematic form of the linear vibration motor according to the present disclosure will be described with reference to FIG.

11(A) to (C) are a plan view and a cross-sectional view taken in the direction of the arrow of the linear vibration motor 100G corresponding to FIGS. 1(A) to (C). The linear vibration motor 100G is different from the linear vibration motor 100E in the fifth modification in the form of the first magnet M1 and the second magnet M2. The other configurations are the same as those of the linear vibration motor 100E, and thus redundant description will be omitted.

In the linear vibration motor 100G, as in the linear vibration motor 100E, the two first magnets M1 penetrate the substrate 2a, and the first portion on the inner wall W2 side of the housing 1 and the housing 1 described above. And a second portion on the inner wall W1 side.

The linear vibration motor 100G further includes two soft magnetic bodies SF in addition to the configuration of the linear vibration motor 100E. For the soft magnetic material SF, for example, Fe, silicon steel, permalloy, amorphous magnetic alloy or the like is used. As shown in FIG. 11B, the soft magnetic body SF is connected to the end of the second portion of the first magnet M1, and the first magnet M1 and the soft magnetic body SF are L-shaped. Is done. In that case, the soft magnetic body SF is magnetized by the first magnet M1. Therefore, the first magnet M1 and the soft magnetic material SF behave like one pseudo L-shaped magnet. That is, the arrangement direction of the magnetic poles of the first magnet M1 can be changed by the soft magnetic material SF.

Therefore, the first magnet M1 and the soft magnetic material SF in the linear vibration motor 100G have the same function as the first magnet M1 in the linear vibration motor 100F. As shown in FIG. 11B, when the soft magnetic material SF is connected to the end portion of the second portion of the first magnet M1, the first magnet M1 and the soft magnetic material SF are smooth. It is preferable that the shape is a curved L-shape.

The magnetic poles of the first portions of the two first magnets M1 are arranged in parallel with the winding axis of the coil 3 and opposite to each other. In FIG. 11B, in one of the two first portions, the S pole faces the winding portion of the coil 3, and in the other of the two first portions, the N pole is the winding portion of the coil 3. Facing each other. That is, the first portion of the first magnet M1 functions as a drive magnet as in the linear vibration motor 100.

When viewed from the first direction D, one of the two soft magnetic bodies SF overlaps with a part of the third magnet M3, and the other overlaps with a part of the fourth magnet M4. .. Further, one of the soft magnetic bodies SF and the third magnet M3 are arranged to repel each other, and the other and the fourth magnet M4 are arranged to repel each other. In FIG. 11B, in one of the two soft magnetic bodies SF magnetized by the first magnet M1, the N pole faces the N pole of the third magnet M3, and on the other side, the S pole is the fourth pole. It faces the south pole of the magnet M4.

Due to this, the two soft magnetic bodies SF, the third magnet M3, and the fourth magnet M4 constitute a magnetic spring mechanism for vibration of the vibrator 2 along the first direction D. That is, in the linear vibration motor 100G, the soft magnetic body SF serves as the second magnet M2.

In the linear vibration motor 100G as well as in the linear vibration motor 100, when the vibrator 2 vibrates along the first direction D, the magnetic field of the magnet forming the magnetic spring mechanism is changed to the Lorentz force applied to the coil 3. The influence exerted can be suppressed. Further, in the linear vibration motor 100G, the manufacturing cost can be reduced by replacing the magnets forming the linear vibration motor 100G with an inexpensive soft magnetic material.

Also in the linear vibration motor 100G, one and the other of the two first magnets M1 are respectively plural, the soft magnetic bodies SF are respectively connected thereto, and the third magnet M3 and the fourth magnet M4 are It may include a plurality of magnets each having the same shape corresponding to them.

-Eighth Modification Example of Schematic Form of Linear Vibration Motor-
A linear vibration motor 100H that is an eighth modification of the linear vibration motor 100 that is a schematic form of the linear vibration motor according to the present disclosure will be described with reference to FIG.

12A to 12C are a plan view and a cross-sectional view taken along the arrow of the linear vibration motor 100H corresponding to FIGS. 1A to 1C. The linear vibration motor 100H is different from the linear vibration motor 100E of the fifth modification in that the linear vibration motor 100H further includes a sixth magnet M6. The other configurations are the same as those of the linear vibration motor 100E, and thus redundant description will be omitted.

The linear vibration motor 100H further includes one sixth magnet M6 as a magnet forming a magnetic spring mechanism in addition to the structure of the linear vibration motor 100E. In the linear vibration motor 100H, the fourth magnet M4 sandwiches a part of the two first magnets M1 with the third magnet M3 along the above-described first direction D. Then, the fourth magnet M4 is fixed to the housing 1 in an arrangement in which a part of the two first magnets M1 adjacent to each other repels each other.

When viewed from the first direction D, the sixth magnet M6 partially overlaps with the third magnet M3 and the fourth magnet M4 and repels the third magnet M3 and the fourth magnet M4. Is connected across the two first magnets M1.

In the linear vibration motor 100H as well as in the linear vibration motor 100, when the vibrator 2 vibrates along the first direction D, the magnetic field of the magnet constituting the magnetic spring mechanism is changed to the Lorentz force applied to the coil 3. The influence exerted can be suppressed.

In addition, in the linear vibration motor 100H, as described above, as the magnets forming the magnetic spring mechanism, in addition to the second portion of the first magnet M1, the third magnet M3 and the fourth magnet M4 are mutually coupled. It further comprises a repulsive sixth magnet M6. Therefore, the performance of the magnetic spring mechanism can be improved.

Note that the linear vibration motor 100H may include a plurality of magnets in which the sixth magnet M6 is connected across the two first magnets M1.

-Ninth Modification of Schematic Form of Linear Vibration Motor-
A linear vibration motor 100I that is a ninth modification of the linear vibration motor 100 that is a schematic form of the linear vibration motor according to the present disclosure will be described with reference to FIG.

13A to 13C are a plan view and a cross-sectional view taken along the arrow of the linear vibration motor 100I corresponding to FIGS. 1A to 1C. The linear vibration motor 100I is different from the linear vibration motor 100H which is the eighth modification in that it has two sixth magnets M6 and does not straddle the two first magnets M1. The other configurations are the same as those of the linear vibration motor 100H, and thus redundant description will be omitted.

In addition to the configuration of the linear vibration motor 100E, the linear vibration motor 100I further includes two sixth magnets M6 as magnets forming a magnetic spring mechanism. As shown in FIG. 13B, the two sixth magnets M6 are arranged such that the third magnet M3 and the fourth magnet M4 have magnetic poles that repel each other, and the two first magnets M1 respectively. Of the first magnet M1 and is not connected to the two first magnets M1.

The two sixth magnets M6 have different shapes, and the one closer to the third magnet M3 has a larger volume than the one closer to the fourth magnet M4. The closer one has a smaller volume than the closer one to the third magnet M3.

Also in the linear vibration motor 100I, when the vibrator 2 vibrates along the first direction D, the magnetic field of the magnet that constitutes the magnetic spring mechanism is changed to the Lorentz force applied to the coil 3 as in the linear vibration motor 100. The influence exerted can be suppressed.

Further, in the linear vibration motor 100I, the capacity of the magnetic spring mechanism can be improved as in the linear vibration motor 100H.

In the linear vibration motor 100I shown in FIG. 13, since the two sixth magnets M6 have different shapes, the magnetic spring mechanism does not change the interval between the magnets constituting the magnetic spring mechanism. Can have anisotropy.

-Tenth Modification of Typical Form of Linear Vibration Motor-
A linear vibration motor 100J that is a tenth modification of the linear vibration motor 100 that is a schematic form of the linear vibration motor according to the present disclosure will be described with reference to FIG.

14(A) to (C) are a plan view and a cross-sectional view taken in the direction of the arrow of the linear vibration motor 100J, which correspond to FIGS. 1(A) to (C). The linear vibration motor 100J is different from the linear vibration motor 100C in which the second magnet M2 and the fifth magnet M5 are the third modification. The other configurations are the same as those of the linear vibration motor 100C, and thus redundant description will be omitted.

In the linear vibration motor 100J, the second magnet M2 has a rectangular parallelepiped shape and penetrates the substrate 2a, and has a first portion on the inner wall W2 side of the housing 1 and a second portion on the inner wall W1 side of the housing 1 described above. And the part of. Then, the first portion is such that the magnetic field of the drive magnet is concentrated between the coil 3 and the drive magnet constituted by the first portions of the two first magnets M1 and the second magnet M2. It is arranged between the two first magnets M1.

Due to this, the first portion of the second magnet M2 functions as a drive magnet similarly to the fifth magnet M5 of the linear vibration motor 100C. That is, in the linear vibration motor 100J, a part of the second magnet M2 is the fifth magnet M5. Then, the two first magnets M1 and the first portion of the second magnet M2 have a Halbach array in a broad sense, as described above. The second portion of the second magnet M2, together with the third magnet M3 and the fourth magnet M4, constitutes a magnetic spring mechanism for the vibration of the vibrator 2 along the first direction D.

Here, like the linear vibration motor 100, the first axis A1 passes through the center of gravity of the overlapping region of the two first magnets M1 when viewed from the first direction D, and goes in the first direction D. Use parallel axes. Further, the second axis A2 passes through the center of gravity of a region where the second portion of the second magnet M2, the third magnet M3, and the fourth magnet M4 overlap each other when viewed in the first direction D. , And an axis parallel to the first direction D. When defined as described above, the distance L1 between the first axis A1 and the coil 3 is shorter than the distance L2 between the second axis A2 and the coil 3.

In the linear vibration motor 100J as well as in the linear vibration motor 100, when the vibrator 2 vibrates along the first direction D, the magnetic field of the magnet that constitutes the magnetic spring mechanism becomes the Lorentz force applied to the coil 3. The influence exerted can be suppressed.

Further, in the linear vibration motor 100J, since a part of the second magnet M2 is added to the drive magnet as described above to form a Halbach array in a broad sense, the drive is performed between the drive magnet and the coil 3. The magnetic field due to the magnet is concentrated, and the magnetic field acting on the coil 3 can be strengthened as compared with the case where the driving magnet is only the first magnet M1. Therefore, the Lorentz force applied to the coil 3 can be increased. As a result, the force applied to the vibrator 2 as a reaction force of the Lorentz force can be increased, and the vibration of the linear vibration motor 100J by the vibrator 2 can be increased.

Further, in the linear vibration motor 100J, a part of the second magnet M2 is the fifth magnet M5 in the linear vibration motor 100C. Therefore, the number of magnets forming the linear vibration motor 100J can be reduced.

-Eleventh Modification of Schematic Form of Linear Vibration Motor-
A linear vibration motor 100K that is an eleventh modification of the linear vibration motor 100 that is a schematic form of the linear vibration motor according to the present disclosure will be described with reference to FIG.

FIGS. 15A to 15C are a plan view and a cross-sectional view taken along the arrow of the linear vibration motor 100K corresponding to FIGS. 1A to 1C. The linear vibration motor 100K is different from the linear vibration motor 100J in the tenth modification in the shape of the second magnet M2. The other configurations are the same as those of the linear vibration motor 100J, and thus redundant description will be omitted.

In the linear vibration motor 100K, the second magnet M2 has a convex cross section as shown in FIG. 15(B). Also in the linear vibration motor 100K, the second magnet M2 penetrates the substrate 2a similarly to the linear vibration motor 100J, and is the first portion on the inner wall W2 side of the housing 1 and the inner wall W1 side of the housing 1. And a second portion.

The first portion of the second magnet M2 is arranged between the two first magnets M1 as in the linear vibration motor 100J, and constitutes a Halbach array in a broad sense. That is, it functions as a drive magnet like the linear vibration motor 100J. Like the linear vibration motor 100J, the second portion, together with the third magnet M3 and the fourth magnet M4, constitutes a magnetic spring mechanism for vibration of the vibrator 2 along the first direction D. The volume of the second portion is larger than the volume of the first portion.

In the linear vibration motor 100K as well as in the linear vibration motor 100, when the vibrator 2 vibrates along the first direction D, the magnetic field of the magnet that constitutes the magnetic spring mechanism becomes the Lorentz force applied to the coil 3. The influence exerted can be suppressed.

Also, in the linear vibration motor 100K, the shape of the second magnet M2 is a convex shape as described above, and the volume of the second portion is larger than the volume of the first portion. Therefore, the magnetic field of the drive magnet can be further strengthened as compared with the linear vibration motor 100J in which the second magnet M2 has a rectangular parallelepiped shape. Therefore, the Lorentz force applied to the coil 3 can be further increased. As a result, the force applied to the vibrator 2 as a reaction force of the Lorentz force can be further increased, and the vibration of the linear vibration motor 100K by the vibrator 2 can be further increased.

-Embodiment of linear vibration motor-
A linear vibration motor 200 showing an embodiment of a linear vibration motor according to the present disclosure will be described with reference to FIGS. 16 and 17.

FIG. 16(A) is a plan view of the linear vibration motor 200 when the first portion 1a of the housing 1 is removed. 16B is a cross-sectional view of the linear vibration motor 200 taken along the plane including the line AA shown in FIG. FIG. 16C is a cross-sectional view of the linear vibration motor 100 taken along a plane including the line BB shown in FIG. 17 is an exploded perspective view of the linear vibration motor 200.

As shown in FIGS. 16 and 17, the linear vibration motor 200 includes a housing 1 (first housing), a vibrator 2, a coil 3, and a third magnet M3. The basic structure of the linear vibration motor 200 is the same as that of the linear vibration motor 100. Therefore, overlapping description will be omitted.

The housing 1 includes a first portion 1a and a second portion 1b. In the linear vibration motor 200, the first portion 1a is a flat plate-shaped lid portion and the second portion 1b is a container portion. For the housing 1, for example, stainless steel such as SUS304 is used. The first portion 1a and the second portion 1b may be made of different materials.

The oscillator 2 is housed in the second portion 1b of the housing 1. In the linear vibration motor 200, the vibrator 2 includes two first magnets M1, a second magnet M2, a fourth magnet M4, a substrate 2a, and a weight portion 2b. The substrate 2a also functions as a weight portion. On the other hand, the weight portion 2b also functions as a substrate.

Like the linear vibration motor 100, the two first magnets M1 are drive magnets, and the second magnet M2, the third magnet M3, and the fourth magnet M4 are magnets that form a magnetic spring mechanism. For each magnet, a rare earth magnet such as Nd-Fe-B system or Sm-Co system is used.

It is preferable to use an Nd—Fe—B based rare earth magnet that has a strong magnetic force and can increase the driving force of the vibrator 2 as the first magnet M1. Further, it is preferable to use an Sm—Co-based rare earth magnet, which has a small change rate of magnetic force with temperature and can stably exhibit a magnetic spring effect, for each magnet constituting the magnetic spring mechanism. The arrangement of the magnetic poles of each magnet is the same as that of the linear vibration motor 100, and duplicated description will be omitted.

For the substrate 2a and the weight portion 2b, for example, W (tungsten) or an alloy containing W such as heavy alloy or ferro-tungsten, stainless steel such as SUS304 and Al (aluminum), or an alloy containing Al (aluminum) such as A2024 or A5052 is used. Is used. In order to increase the mass of the vibrator 2 and transmit a large vibration to the housing 1 via the magnetic spring mechanism, the material of the substrate 2a and the weight portion 2b should include a material having a large specific gravity such as W (tungsten). preferable.

The substrate 2a is provided with a slot SL2 to which the second magnet M2 is fixed and a slot SL3 to which the fourth magnet M4 is fixed. The slots SL2 and SL3 are angular C-shaped members, and the second magnet M2 and the third magnet M3 can face each other, and the third magnet M3 and the fourth magnet M4 can face each other. Thus, they are arranged along the first direction D. Each magnet is fixed in this with an epoxy adhesive, for example.

In order to avoid collision between the oscillator 2 and the housing 1, the slot SL2 has a distance between the second magnet M2 and the third magnet M3 to be inserted that is equal to a distance between the end surfaces of the substrate 2a and the weight portion 2b and the housing 1. It is provided at one end of the substrate 2a as described below. Similarly, in the slot SL3, the distance between the inserted fourth magnet M4 and the third magnet M3 is equal to or less than the distance between the end faces of the substrate 2a and the weight portion 2b and the housing 1. It is provided at the other end.

By inserting the second magnet M2 in the slot SL2 and the fourth magnet M4 in the slot SL3, it becomes easy to fix each magnet to the substrate 2a, and each magnet is accurately fixed to the substrate 2a. be able to.

A slot SL1 to which the first magnet M1 is fixed is provided at the center of the weight 2b. The slot SL1 is a through hole formed in the weight portion 2b. By inserting the first magnet M1 into the slot SL1, the first magnet M1 can be easily fixed to the weight portion 2b, and the first magnet M1 can be accurately fixed to the weight portion 2b. The slot SL1 does not have to penetrate the weight portion 2b.

In the vibrator 2, the second magnet M2 is fixed to the slot SL2 of the substrate 2a, the fourth magnet M4 is fixed to the slot SL3, and the first magnet M1 is fixed to the slot SL1 of the weight portion 2b. And the weight portion 2b are bonded together to be formed. Note that the vibrator 2 may be formed by fixing each magnet to an integrated body of the substrate 2a and the weight portion 2b.

As the coil 3, for example, a coated Cu wire having a diameter of 0.06 mm wound about 50 turns is used. The coil 3 is connected to a stabilized power source via a power amplifier by a lead wiring member such as a flexible substrate (the lead wiring member and each device are not shown). The coil 3 applies a driving force to the first magnet M1 so that the vibrator 2 can vibrate along the first direction D. The arrangement and shape of the coil 3 are the same as those of the linear vibration motor 100, and redundant description will be omitted.

In the linear vibration motor 200, the vibrator 2 is supported by the sliding mechanism 4 including the first sliding mechanism 4a and the second sliding mechanism 4b. The vibrator 2 is connected to the inner wall W3 of the housing 1 by the first sliding mechanism 4a, and is connected to the inner wall W4 of the housing 1 by the second sliding mechanism 4b (see FIG. 1). The sliding mechanism 4 includes a guide rail and a moving body using a ball bearing or the like, and friction during movement of the moving body on the guide rail is reduced. The guide rail is fixed to the housing 1 side, and the moving body is fixed to the vibrator 2 side.

In the linear vibration motor 200, when viewed from the first direction D, the second magnet M2, the third magnet M3, and the fourth magnet M4 partially overlap each other. Then, similar to the linear vibration motor 100, the distance L1 between the first axis A1 and the coil 3 is shorter than the distance L2 between the second axis A2 and the coil 3.

Therefore, even in the linear vibration motor 200, when the vibrator 2 vibrates in the first direction D, it is possible to suppress the influence of the magnetic field of the magnets forming the magnetic spring mechanism on the Lorentz force applied to the coil 3. it can. As a result, it is possible to suppress a decrease in the force applied to the vibrator 2 as a reaction force of the Lorentz force, and to suppress a decrease in vibration of the linear vibration motor 200 due to the vibrator 2. Further, since the vibrator 2 includes the weight portion 2b, the mass of the vibrator 2 is increased, and large vibration is transmitted to the housing 1.

-First Modification of Linear Vibration Motor Embodiment-
A linear vibration motor 200A that is a first modification of the linear vibration motor 200 showing the embodiment of the linear vibration motor according to the present disclosure will be described with reference to FIGS. 18 and 19.

18A to 18C are a plan view and a cross-sectional view taken along the arrow of the linear vibration motor 200A corresponding to FIGS. 16A to 16C. Further, FIG. 19 is an exploded perspective view of the linear vibration motor 200A. The linear vibration motor 200A differs from the linear vibration motor 200 in that it further includes a fifth magnet M5.

That is, the fifth magnet M5 is a driving magnet whose magnetic field of the magnet array formed by the two first magnets M1 and the fifth magnet M5 is a driving magnet including the first magnet M1 and the fifth magnet M5. It is arranged so as to concentrate between the coil 3 and the coil 3. The array of magnets formed by the two first magnets M1 and the fifth magnet M5 is fixed to the slot SL1 of the weight portion 2b. The other configurations are the same as those of the linear vibration motor 200, and thus redundant description will be omitted.

In the linear vibration motor 200A as well, similar to the linear vibration motor 200, when the vibrator 2 vibrates in the first direction D, the magnetic field of the magnet forming the magnetic spring mechanism is changed to the Lorentz force applied to the coil 3. The influence exerted can be suppressed.

In addition, in the linear vibration motor 200A, by adding the fifth magnet M5 to the drive magnet, the magnetic field generated by the drive magnet is concentrated between the drive magnet and the coil 3, and the drive magnet is only the first magnet M1. The magnetic field of the drive magnet acting on the coil 3 can be strengthened more than in the case. Therefore, the Lorentz force applied to the coil 3 can be increased. As a result, the force applied to the vibrator 2 as a reaction force of the Lorentz force can be increased, and the vibration of the linear vibration motor 200A by the vibrator 2 can be increased.

-Second Modification of Linear Vibration Motor Embodiment-
A linear vibration motor 200B that is a second modification of the linear vibration motor 200 showing the embodiment of the linear vibration motor according to the present disclosure will be described with reference to FIGS. 20 and 21.

20A to 20C are a plan view and a cross-sectional view taken along the arrow of the linear vibration motor 200B corresponding to FIGS. 16A to 16C. In addition, FIG. 21 is an exploded perspective view of the linear vibration motor 200B. The linear vibration motor 200B is different from the linear vibration motor 200 in the positional relationship between the second magnet M2, the third magnet M3, and the fourth magnet M4 and the structure of the weight portion 2b. The other configurations are the same as those of the linear vibration motor 200, and thus redundant description will be omitted.

In the linear vibration motor 200B, as shown in FIG. 20(A), the second magnet M2 is provided in the central portion of the substrate 2a so that the arrangement direction of the magnetic poles is parallel to the first direction D. It is fixed to the slot SL2. The slot SL2 is two angular C-shaped members. The two members are arranged along a direction orthogonal to the first direction D so that the second magnet M2 and the third magnet M3 can face each other and the second magnet M2 and the fourth magnet M4 can face each other. Are arranged. The second magnet M2 is fixed therein by, for example, an epoxy adhesive.

In the linear vibration motor 200B as well as in the linear vibration motor 200, when the vibrator 2 vibrates along the first direction D, the magnetic field of the magnet that constitutes the magnetic spring mechanism becomes the Lorentz force applied to the coil 3. The influence exerted can be suppressed.

The embodiment of the linear vibration motor is not limited to the above. For example, any of the above-described schematic forms of the linear vibration motor can be applied as an embodiment of the linear vibration motor.

-Schematic form of electronic equipment-
A portable information terminal 1000 showing a schematic form of an electronic device using a linear vibration motor according to this disclosure will be described with reference to FIGS. 22 and 23.

FIG. 22 is a transparent perspective view of the portable information terminal 1000. In addition, FIG. 23 is a cross-sectional view of a main part of the portable information terminal 1000.

The portable information terminal 1000 includes a housing 1001 (second housing), the linear vibration motor 100 according to the present disclosure, and an electronic circuit (not shown) related to transmission/reception and information processing. The housing 1001 includes a first portion 1001a and a second portion 1001b. The first portion 1001a is a display and the second portion 1001b is a frame. The linear vibration motor 100 is housed in a housing 1001.

The linear vibration motor 100 according to the present disclosure is used in the portable information terminal 1000 as a vibration generation device for feedback of skin sensation or for confirming a key operation or an incoming call by vibration. The linear vibration motor used in the portable information terminal 1000 is not limited to the linear vibration motor 100, and any linear vibration motor according to the present disclosure may be used. In that case, it is possible to suppress a decrease in vibration of the portable information terminal due to the influence of the magnetic spring mechanism of the linear vibration motor.

Incidentally, as shown in FIG. 23, the second portion 1b of the housing 1 of the linear vibration motor 100 includes a container body 1b1 and a fixed portion 1b2. The fixed portion 1b2 is a portion protruding from the bottom of the container body 1b1. In the portable information terminal 1000, the fixing portion 1b2 is fixed to the second portion 1001b with the screw B so that the bottom of the container body 1b1 of the linear vibration motor 100 and the second portion 1001b are in contact with each other.

Here, in the linear vibration motor 100, the third magnet M3 is fixed to the inner wall W1 of the housing 1 inside the bottom of the container body 1b1 (see FIG. 1). That is, in the portable information terminal 1000, the part of the housing 1 to which the third magnet M3 is fixed is in contact with the housing 1001.

The vibration of the vibrator 2 of the linear vibration motor 100 is transmitted to the housing 1 as the vibration of the third magnet M3 forming the magnetic spring mechanism as described above. Therefore, when the portion of the housing 1 to which the third magnet M3 is fixed contacts the housing 1001 as described above, the vibration of the linear vibration motor 100 is effectively transmitted to the housing 1001 of the portable information terminal 1000.

Note that the portion of the linear vibration motor 100 to which the third magnet M3 is fixed may be in contact with the first portion 1001a of the housing 1001 of the portable information terminal 1000, that is, the display.

A portable information terminal equipped with a display has been shown as an example of a schematic form of an electronic device in which the linear vibration motor according to this disclosure is used, but the invention is not limited to this. The electronic device according to this disclosure may not include a display.

For example, as electronic devices according to this disclosure, mobile phones (so-called feature phones), smartphones, portable video game machines, controllers for video game machines, controllers for VR (Virtual Reality) devices, smart watches, tablet computers, notebook computers, TVs. Examples thereof include a remote controller used for operations such as, a touch panel type display such as an automatic teller machine, and electronic devices such as various toys.

The embodiment disclosed in this specification is an exemplification, and the invention according to this disclosure is not limited to the above embodiment and modification. That is, the scope of the invention according to this disclosure is shown by the claims, and is intended to include meanings equivalent to the claims and all modifications within the scope. Further, various applications and modifications can be added within the above range.

The invention according to this disclosure is applied to, for example, a linear vibration motor used as a vibration generator for feedback of skin sensations in electronic devices or for confirming key operation or incoming call with vibration. As the skin sensation feedback, for example, a tactile image corresponding to an operation in a video game (for example, opening and closing a door or operating a steering wheel of a car) is represented by vibration of a controller. However, other skin sensory feedback may be used.

Also, it is not limited to this, and can be applied to a linear vibration motor used as an actuator of a robot.

100 linear vibration motor 1 housing (first housing)
2 oscillator 3 coil M1 first magnet M2 second magnet M3 third magnet M4 fourth magnet D first direction A1 first axis A2 second axis L1 distance between first axis and coil L2 Distance between second axis and coil

Claims

The first housing,
A vibrator housed in the first housing and including at least one first and second magnet, respectively;
A coil that is fixed to the first housing and applies a driving force to the first magnet so that the vibrator can vibrate in a first direction;
At least one third magnet fixed to the first housing in a repulsive arrangement with the second magnet along the first direction;
The oscillator is included in the vibrator in such a manner that the third magnet is sandwiched between the second magnet and the second magnet along the first direction, and the oscillator is arranged to repel each other with the third magnet. At least one fixed to the first housing in such a manner that the second magnet is sandwiched between the third magnet and the third magnet along the direction of 1 and is arranged to repel each other with the second magnet. And a fourth magnet,
When viewed from the first direction, the second to fourth magnets are partially overlapped with each other,
The distance between the coil and the first axis passing through the center of gravity of the surface of the first magnet when viewed from the first direction and parallel to the first direction is viewed from the first direction. A linear vibration motor, wherein the second to fourth magnets sometimes pass through a center of gravity of a region where they overlap each other and are shorter than a distance between a coil and a second axis parallel to the first direction.
The first magnet includes two magnets whose magnetic poles are arranged in directions opposite to each other in the winding axis direction of the coil, and which are arranged along the first direction.
The linear vibration motor according to claim 1, wherein the first axis passes through a center of gravity of a region where the two magnets overlap each other.
Further comprising at least one fifth magnet,
In the fifth magnet, a magnetic field of an array of magnets formed by the two magnets of the first magnet and the fifth magnet faces the coil between the two magnets of the first magnet. The linear vibration motor according to claim 2, wherein the linear vibration motor is arranged so as to be concentrated on the side where the vibration occurs.
The linear vibration motor according to claim 3, wherein the two magnets of the first magnet and the fifth magnet are arranged in a Halbach array.
The linear vibration motor according to claim 3 or 4, wherein a part of the second magnet serves as the fifth magnet.
The linear vibration motor according to claim 2, wherein a part of the first magnet serves as the second magnet.
The first magnet includes two L-shaped magnets,
In one of the two L-shaped magnets, one magnetic pole faces the coil, and the other magnetic pole faces the magnetic pole of the third magnet,
The linear vibration motor according to claim 6, wherein in the other of the two L-shaped magnets, one magnetic pole faces the coil and the other magnetic pole faces the magnetic pole of the fourth magnet.
Further comprising two soft magnetic materials,
In the first magnet, one of the two magnets of the first magnet and one of the two soft magnetic bodies are connected in an L-shape, and the other of the two magnets of the first magnet is connected. And a pseudo L-shaped magnet, in which the other of the two soft magnetic bodies is connected in an L-shape,
In one of the two pseudo L-shaped magnets, one magnetic pole faces the coil and the other magnetic pole faces the magnetic pole of the third magnet,
7. The linear vibration according to claim 6, wherein in the other of the two pseudo L-shaped magnets, one magnetic pole faces the coil and the other magnetic pole faces the magnetic pole of the fourth magnet. motor.
Further comprising at least one sixth magnet,
The fourth magnet sandwiches a part of the two magnets of the first magnet with the third magnet along the first direction, and the fourth magnet has one of the first magnets. Is fixed to the first housing in an arrangement that repels each other,
When viewed from the first direction, the sixth magnet partially overlaps the third and fourth magnets and repels the third and fourth magnets. The linear vibration motor according to claim 6, wherein the linear vibration motor is connected across the two magnets.
The vibrator further includes a plate-shaped substrate,
The linear vibration motor according to claim 1, wherein the second magnet is arranged on a side surface of the substrate.
The linear vibration motor according to any one of claims 1 to 10, wherein the vibrator further includes a weight portion.
A linear vibration motor according to any one of claims 1 to 11, and a second housing,
The said linear vibration motor is an electronic device accommodated in the said 2nd housing.
The electronic device according to claim 12, wherein a portion of the first housing to which the third magnet is fixed is in contact with the second housing.
Further equipped with a display,
The electronic device according to claim 12, wherein a portion of the first housing to which the third magnet is fixed is in contact with the display.