JP7207428B2 - Linear vibration motor and electronic equipment using it - Google Patents

Description

This disclosure relates to a linear vibration motor and an electronic device using the same.

An example of a 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. FIG. A 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, and a housing in which a third magnet M303 and a fifth magnet M305 are fixed. 301.

The vibrator 302 is driven along the first direction D by the coil 303 and the first magnet M301 that functions as a driving magnet that provides a driving force along the first direction D when current flows through the coil 303 . 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 constitute a magnetic spring mechanism against vibration of the vibrator 302 along the first direction D. there is

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

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

In the linear vibration motor 300, each magnet is arranged on one axis parallel to the first direction D. As shown in FIG. 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 has the effect of reducing the Lorentz force generated by the magnetic field of the first magnet M301 and the current flowing through the coil 303. may give

As a result, the force applied to the vibrator 302 as a reaction force of the Lorentz force is reduced, and there is a possibility that the vibration of the linear vibrating motor 300 by the vibrator 302 is reduced. As a result, in an electronic device using the linear vibrating motor 300, there is a possibility that vibrations for skin sensation feedback called haptics technology or for confirming key operations and incoming calls may be reduced.

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

In the linear vibration motor according to this disclosure, improvements are made in the arrangement of the magnets that make up the magnetic spring mechanism.

A linear vibrating motor according to this disclosure includes: a first housing; a vibrator housed within the first housing and including at least one first and second magnets, respectively; fixed to the first housing; and a coil fixed to the first housing in a mutually repulsive arrangement with the second magnet along the first direction. The vibrator includes at least one third magnet and a second magnet along the first direction in such a manner that the third magnet is sandwiched between the third magnet and arranged to repel each other with the third magnet. or secured to the first housing in a mutually repulsive arrangement with the second magnet sandwiching the second magnet along the first direction with the third magnet. and four fourth magnets.

When viewed from the first direction, the second to fourth magnets partially overlap each other. Further, when viewed from the first direction, the distance between the coil and the first axis passing through the center of gravity of the surface of the first magnet and parallel to the first direction is It is shorter than the distance between the coil and a second axis parallel to the first direction passing through the center of gravity of the region where the two 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. A linear vibrating motor is housed within the second housing.

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

FIG. 1(A) is a plan view of a linear vibrating motor 100 showing a schematic form of a linear vibrating motor according to this disclosure when a first portion 1a of a housing 1 is removed. FIG. 1(B) is a cross-sectional view of the linear vibration motor 100 taken along a plane including line AA shown in FIG. 1(A). FIG. 1(C) is a cross-sectional view of the linear vibration motor 100 taken along a plane including line BB shown in FIG. 1(B). 2 is an exploded perspective view of the linear vibration motor 100; FIG. 3A to 3D are cross-sectional views corresponding to FIG. 1B, respectively, for explaining a series of operations of the linear vibration motor 100. FIG. 4A to 4C are a plan view and a cross-sectional view corresponding to FIGS. 1A to 1C of a linear vibration motor 100A, which is a first modification of the linear vibration motor 100. FIG. . 5A to 5C are a plan view and a cross-sectional view corresponding to FIGS. 1A to 1C of a linear vibration motor 100B, which is a second modification of the linear vibration motor 100. FIG. . 2 is an exploded perspective view of linear vibration motor 100B. FIG. 7A to 7C are a plan view and a cross-sectional view corresponding to FIGS. 1A to 1C of a linear vibration motor 100C, which is a third modification of the linear vibration motor 100. FIG. . 8A to 8C are a plan view and a cross-sectional view corresponding to FIGS. 1A to 1C of a linear vibration motor 100D, which is a fourth modification of the linear vibration motor 100. FIG. . 9A to 9C are a plan view and a cross-sectional view corresponding to FIGS. 1A to 1C of a linear vibration motor 100E, which is a fifth modification of the linear vibration motor 100. FIG. . 10A to 10C are a plan view and a cross-sectional view corresponding to FIGS. 1A to 1C of a linear vibration motor 100F, which is a sixth modification of the linear vibration motor 100. FIG. . 11A to 11C are a plan view and a cross-sectional view corresponding to FIGS. 1A to 1C of a linear vibration motor 100G, which is a 76th modification of the linear vibration motor 100. FIG. . 12A to 12C are a plan view and a cross-sectional view corresponding to FIGS. 1A to 1C of a linear vibration motor 100H, which is an eighth modification of the linear vibration motor 100. FIG. . 13A to 13C are a plan view and a cross-sectional view corresponding to FIGS. 1A to 1C of a linear vibration motor 100I, which is a ninth modification of the linear vibration motor 100. FIG. . 14A to 14C are a plan view and a cross-sectional view corresponding to FIGS. 1A to 1C of a linear vibration motor 100J, which is a tenth modification of the linear vibration motor 100. FIG. . 15A to 15C are a plan view and a cross-sectional view corresponding to FIGS. 1A to 1C of a linear vibration motor 100K, which is an eleventh modification of the linear vibration motor 100. FIG. . FIG. 16A is a plan view of a linear vibrating motor 200 showing an embodiment of a linear vibrating motor according to this disclosure when the first portion 1a of the housing 1 is removed. FIG. 16(B) is a cross-sectional view of the linear vibration motor 200 taken along a plane including line AA shown in FIG. 16(A). FIG. 16(C) is a cross-sectional view of the linear vibration motor 200 taken along a plane including line BB shown in FIG. 16(B). 2 is an exploded perspective view of the linear vibration motor 200; FIG. 18A to 18C are a plan view and a cross-sectional view corresponding to FIGS. 16A to 16C of a linear vibration motor 200A that is a first modification of the linear vibration motor 200. FIG. . 2 is an exploded perspective view of a linear vibration motor 200A; FIG. 20A to 20C are a plan view and a cross-sectional view corresponding to FIGS. 16A to 16C of a linear vibration motor 200B, which is a second modification of the linear vibration motor 200. FIG. . Fig. 10 is an exploded perspective view of the linear vibration motor 200B; 1 is a see-through perspective view of a portable information terminal 1000, which is a schematic form of an electronic device according to this disclosure. FIG. 2 is a cross-sectional view of a main part of the portable information terminal 1000; FIG. 1 is a cross-sectional view of a linear vibration motor 300 of background art; FIG.

Features of this disclosure will be described with reference to the drawings. In the schematic forms and embodiments of the linear vibration motor shown below, the same or common parts 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.

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

The linear vibration motor 100, as shown in FIGS. 1 and 2, 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 vibrating motor 100, the first portion 1a is a flat lid portion, and the second portion 1b is a container portion. That is, the housing 1 has a sealed structure, but the shape is not limited to this. For example, the housing 1 may be cylindrical and may have an opening partially. As will be described later, the second portion 1b includes a container main body 1b1 and a fixing portion 1b2, but the fixing portion 1b2 is omitted (same below).

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. In addition, the inner walls W3 and W4 correspond to the side wall surfaces of the housing 1 shown in FIG. 1(B).

The vibrator 2 is housed within 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 along the first direction D with a space therebetween so as to face the winding portions of the coils 3, which will be described later. In addition, the two first magnets M1 are arranged such that the magnetic pole arrangement directions 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 faces the coil. 3 facing the winding part. By arranging in this way, the Lorentz force applied to the coil 3, which will be described later, can be increased. Note that 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, when viewed from the first direction D, the two first magnets M1 appear to overlap each other. However, the shape of the first magnet M1 is not limited to this. Note that the number of the first magnets M1 may be only one.

The coil 3 applies a driving force to the first magnet M1 so that the vibrator 2 can vibrate along the first direction D by being energized. In FIGS. 1 and 2, the windings of the coil 3 and the energization paths (wiring paths) to the coil 3 are omitted. In the linear vibration motor 100, the coil 3 is arranged in the housing such that the winding axis is parallel to the normal direction of the first portion 1a of the housing 1, that is, the winding axis is perpendicular 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 a 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 perpendicular to both the direction of the magnetic field and the direction of current flow. On the other hand, since the coil 3 is fixed to the housing 1, the 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, by extension, to the vibrator 2 when energized. That is, the first magnet M1 functions as a drive magnet in the linear vibration motor 100. As shown in FIG.

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

The second magnet M2 is fixed to one end of the substrate 2a in such a manner that the magnetic pole arrangement direction thereof is parallel to the first direction D, and that the third magnet M3 described later repels each other. Here, in order to avoid collision between the vibrator 2 and the housing 1, the second magnet M2 and the third magnet M3 are spaced apart from the end face of the substrate 2a and the housing 1 before vibration. are fixed to the substrate 2a so that the distance between them is less than or equal to . 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 has a magnetic pole array direction parallel to the first direction D, and is arranged to repel the second magnet M2 along the first direction D. It is fixed at W1.

The fourth magnet M4 is fixed to the substrate 2a of the vibrator 2 in such an arrangement that the magnetic pole arrangement direction is parallel to the first direction D and that the third magnet M3 and the third magnet M3 repel each other along the first direction D. ing. As with the second magnet M2, the fourth magnet M4 is also arranged so that 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 face of the substrate 2a and the housing 1. , preferably at the same intervals, fixed to the substrate 2a.

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 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 face each other, and the S pole of the third magnet M3 and the fourth The south pole of magnet M4 faces each other. Thereby, the second magnet M2, the third magnet M3, and the fourth magnet M4 constitute a magnetic spring mechanism against vibration of the vibrator 2 along the first direction D. As shown in FIG.

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 passing through the center of gravity of the overlapping region of the two first magnets M1 when viewed from the first direction D and parallel to the first direction D is defined as a first axis A1. As mentioned above, since the two first magnets M1 have the same shape, the center of gravity of the overlapping area of the two first magnets M1 is equal to the center of gravity of the surface of the first magnets M1. Further, when viewed from the first direction D, an axis line parallel to the first direction D 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, 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 periphery of the first magnet M1 viewed from the first direction. Further, 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. Refers to the centroid of the figure. The distance between each axis and the coil refers to the distance between each axis and the tip of the coil 3 farther from the housing 1 .

In the linear vibration motor 100, the first magnet M1, which is the drive magnet for the vibrator 2, and the second, third, and fourth magnets M2, M3, and M4, which constitute the magnetic spring mechanism, are arranged along one axis. not placed on a 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, and the second axis A2 is located farther from the coil 3 than the first axis A1. be.

Here, the operation of the linear vibration motor 100 will be explained using FIG. 3A to 3D are cross-sectional views corresponding to FIG. 1B, respectively, for explaining a series of operations of the linear vibration motor 100. FIG.

FIG. 3A shows a state in which the vibrator 2 is not vibrating and the coil 3 has started to be 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 right cross section of the coil 3 indicates that the current flows from the front side to the back side in the figure. An upward arrow extending from the N pole of the first magnet M1 and a downward arrow extending from the S pole indicate the direction of the magnetic field generated by the first magnet M1.

When a current flows through the coil 3 in the direction described above, the coil 3 is subjected to a Lorentz force in a direction orthogonal to the direction of the magnetic field and the direction of current flow (thinly shaded in the figure) due to the magnetic field of the first magnet M1. arrow pointing to the right) is added. On the other hand, since the coil 3 is fixed to the housing 1, the reaction force of the Lorentz force (dark leftward arrow in the drawing) is applied to the first magnet M1. Therefore, the vibrator 2 is provided with a driving force that moves the vibrator 2 along the first direction D leftward in the figure.

In this state, the second axis A2 passing through the magnets that make up the magnetic spring mechanism is located farther from the coil 3 than the first axis A1 passing through the first magnet M1 that is the 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 has moved leftward 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 that moves the fourth magnet M4 to the right in the figure (a white arrow pointing to the right in the figure) is applied to the fourth magnet M4. On the other hand, a force that moves the third magnet M3 to the left in the drawing (a white leftward arrow in the drawing) is applied to the third magnet M3. 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 deformation shown in FIG. 3B is schematically represented (the same applies hereinafter).

When the direction of the current flowing through the coil 3 is reversed, the Lorentz force is applied to the coil 3 in a direction opposite to the direction shown in FIG. However, since the overlapping area of the winding portion of the coil 3 and the first magnet M1 when viewed from the winding axis direction of the coil 3 is smaller than the state shown in FIG. The magnitude of the generated Lorentz force is reduced (small left-pointing arrow in the figure). Then, the reaction force of this Lorentz force is applied to the first magnet M1 (the small dark arrow pointing to the right in the drawing).

Therefore, due to the force applied to the fourth magnet M4 and the reaction force of the Lorentz force, the vibrator 2 is provided with a driving force that moves the vibrator 2 to the right in the figure along the first direction D. .

Even in this state, the second axis A2 passing through the magnets that make up the magnetic spring mechanism is farther from the coil 3 than the first axis A1 passing through the first magnet M1 that is the 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 has moved to the right in the figure. When the vibrator 2 moves to the right, the second magnet M2 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 that moves the second magnet M2 to the left in the drawing (white leftward arrow in the drawing) is applied to the second magnet M2. On the other hand, a force that moves the third magnet M3 to the right in the drawing (a white arrow pointing to the right in the drawing) is applied to the third magnet M3. 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 a direction opposite to that in FIG. 3(B).

When the direction of the current flowing through the coil 3 is reversed, the Lorentz force is applied to the coil 3 in a direction opposite to the direction shown in FIG. 3(B). Similar to the state shown in FIG. 3(B), the magnitude of the generated Lorentz force is reduced (the small rightward arrow that is painted lightly in the figure). Then, the reaction force of this Lorentz force is applied to the first magnet M1 (the dark leftward small arrow in the drawing).

Therefore, the force applied to the second magnet M2 and the reaction force of the Lorentz force provide the vibrator 2 with a driving force that moves the vibrator 2 to the left in the drawing along the first direction D. .

Even in this state, the second axis A2 passing through the magnets that make up the magnetic spring mechanism is farther from the coil 3 than the first axis A1 passing through the first magnet M1 that is the 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 vibrator 2 is in the same state as in 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. Also, the second portion 1b of the housing 1 to which the third magnet M3 is fixed deforms 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 that constitutes 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 along 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. can. As a result, the decrease in the force applied to the vibrator 2 as the reaction force of the Lorentz force can be suppressed, and the decrease in the vibration of the linear vibration motor 100 can be suppressed.

Since the vibrator 2 can vibrate along the first direction D, the structure in which the vibrator 2 is supported within 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 is moved by a sliding mechanism 4 including a first sliding mechanism 4a and a second sliding mechanism 4b. 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. 1(C), there is provided a guide rail and a moving body using a ball bearing or the like, and a sliding body with reduced friction during movement of the moving body on the guide rail is provided. mechanism can be used. The guide rail is fixed on the housing 1 side, and the moving body is fixed on the vibrator 2 side.

-First Modification of Schematic Form of Linear Vibration Motor-
A linear vibration motor 100A, which is a first modification of linear vibration motor 100, which is a schematic form of a 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 corresponding to FIGS. 1A to 1C of the linear vibration motor 100A. Linear vibration motor 100A differs from linear vibration motor 100 in the number and arrangement of second magnets M2, third magnets M3 and fourth magnets M4. Since other configurations are the same as those of the linear vibration motor 100, redundant 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 the second magnet M2, the third magnet M3 and the fourth magnet M4 overlap. Also, the other parts of the second magnet M2, the third magnet M3 and the fourth magnet M4 are overlapped.

That is, in the linear vibration motor 100A, two magnetic spring mechanisms are arranged in parallel. Therefore, there are two second axis lines A2 that pass 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 and are parallel to the first direction D.

In the linear vibrating motor 100A, similarly to the linear vibrating motor 100, when the vibrator 2 vibrates along the first direction D, the magnetic field of the magnets forming the magnetic spring mechanism is applied to the coil 3 by the Lorentz force. It is possible to suppress the influence of

Further, in the linear vibration motor 100A, as described above, two magnetic spring mechanisms are arranged in parallel. Therefore, it is possible to suppress the influence of errors in the attachment positions of the magnets of the magnetic spring mechanism.

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

5A to 5C are a plan view and a cross-sectional view corresponding to FIGS. 1A to 1C of the linear vibration motor 100B. Also, FIG. 6 is an exploded perspective view of the linear vibration motor 100B. Linear vibration motor 100B differs from linear vibration motor 100 in the positional relationship of second magnet M2, third magnet M3, and fourth magnet M4. Since other configurations are the same as those of the linear vibration motor 100, redundant 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 magnetic pole arrangement direction is parallel to the first direction D. It is Further, the third magnet M3 and the fourth magnet M4 sandwich the second magnet M2 in a plan view, and have magnetic poles repelling each other with the second magnet M2. is fixed to the portion 1b of the

Here, as in the case of the linear vibrating motor 100, the third magnet M3 has a distance of It is fixed to the substrate 2a so that the distance between the end face of the substrate 2a and the housing 1 is equal to or smaller than the distance. 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 .

Also, in the fourth magnet M4, similarly to the third magnet M3, the distance between the fourth magnet M4 and the third magnet M3 before vibration is equal to or less than the distance between the end face of the substrate 2a and the housing 1. so that they are fixed to the substrate 2a preferably 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 are opposed to each other, and the S pole of the second magnet M2 and the fourth magnet M3 are opposite to each other. The south pole of magnet M4 faces each other. Thereby, the second magnet M2, the third magnet M3, and the fourth magnet M4 constitute a magnetic spring mechanism against vibration of the vibrator 2 along the first direction D. As shown in FIG.

Then, when viewed from the first direction D, the second magnet M2, the third magnet M3, and the fourth magnet M4 partially overlap each other, similarly to the linear vibration motor 100. FIG.

In the linear vibrating motor 100B, similarly to the linear vibrating motor 100, when the vibrator 2 vibrates along the first direction D, the magnetic field of the magnets forming the magnetic spring mechanism causes the Lorentz force applied to the coil 3. It is possible to suppress the influence of

The linear vibration motor 100B, like the linear vibration motor 100A, includes two magnets each having the same shape: the second magnet M2, the third magnet M3, and the fourth magnet M4. good too.

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

7A to 7C are a plan view and a cross-sectional view corresponding to FIGS. 1A to 1C of the linear vibration motor 100C. The linear vibration motor 100C differs from the linear vibration motor 100 in that it further includes a fifth magnet M5. Since other configurations are the same as those of the linear vibration motor 100, redundant 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 is sandwiched between the two first magnets M1 with the magnetic pole arrangement direction parallel to the first direction D. , is fixed to the central portion of the substrate 2a.

As described above, the two first magnets M1 are arranged such that the magnetic pole arrangement directions are parallel to the winding axis of the coil 3, that is, perpendicular to the first direction D and opposite to each other. It is In addition, the fifth magnet M5 is such that the magnetic field of the magnet array formed by the two first magnets M1 and the fifth magnet M5 is different from that of the drive magnet including the first magnet M1 and the fifth magnet M5. It is arranged so as to concentrate between it and the coil 3 .

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

In this disclosure, a Halbach array is broadly referred to as an array of drive magnets that allows the magnetic field of the drive magnets to be concentrated between the drive magnets and the coil that drives the oscillator. The number of magnets forming the Halbach array may be an odd number of 3 or more.

In the linear vibrating motor 100C, similarly to the linear vibrating motor 100, when the vibrator 2 vibrates along the first direction D, the magnetic field of the magnets forming the magnetic spring mechanism causes the Lorentz force applied to the coil 3. It is possible to suppress the influence of

In addition, in the linear vibration motor 100C, by adding the fifth magnet M5 to the driving magnet, the magnetic field of the driving magnet concentrates between the driving magnet and the coil 3, and the driving magnet is only the first magnet M1. The magnetic field acting on the coil 3 can be stronger 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 vibrating motor 100 by the vibrator 2 can be increased.

In the linear vibration motor 100C, like the linear vibration motor 100A, the second magnet M2, the third magnet M3, and the fourth magnet M4 may include two magnets each having the same shape. good. Also, 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, which is a fourth modification of linear vibration motor 100, which is a schematic form of the linear vibration motor according to this disclosure, will be described with reference to FIG.

8A to 8C are a plan view and a cross-sectional view corresponding to FIGS. 1A to 1C of the linear vibration motor 100D. Linear vibration motor 100D differs from linear vibration motor 100 in the number of second magnets M2, third magnets M3, and fourth magnets M4, and in the positional relationship. Since other configurations are the same as those of the linear vibration motor 100, redundant description will be omitted.

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

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

One of the third magnets M3 is partially inserted into a recess on one side surface of the substrate 2a. When viewed from the first direction D, one of the third magnets M3 faces one of the second magnets M2 and one of the fourth magnets M4, respectively. 1b. The other of the two third magnets M3 is partly inserted into a recess on the other side surface of the substrate 2a. When viewed from the first direction D, they are fixed to the second portion 1b of the housing 1 so as to face the other of the second magnets M2 and the other of the fourth magnets M4.

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

That is, in the linear vibration motor 100D as well, two magnetic spring mechanisms are arranged in parallel. Therefore, there are two second axis lines A2 that pass 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 and are parallel to the first direction D.

In the linear vibrating motor 100D, similarly to the linear vibrating motor 100, when the vibrator 2 vibrates along the first direction D, the magnetic field of the magnets forming the magnetic spring mechanism is converted into the Lorentz force applied to the coil 3. It is possible to suppress the influence of In addition, by arranging the two magnetic spring mechanisms in parallel, it is possible to suppress the influence of errors in the attachment positions of the magnets of the magnetic spring mechanisms. Furthermore, since each magnet constituting 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. , the magnetic field generated by the driving magnet may be concentrated. Also, 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, which is a fifth modification of linear vibration motor 100, which 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 corresponding to FIGS. 1A to 1C of the linear vibration motor 100E. Linear vibration motor 100E differs from linear vibration motor 100B, which is the second modification, in the form of first magnet M1 and second magnet M2. Since other configurations are the same as those of the linear vibration motor 100B, redundant description will be omitted.

In the linear vibration motor 100E, the two first magnets M1 penetrate the substrate 2a, and are located at 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. part. The two first magnets M1 are arranged so that their magnetic poles are arranged in parallel with the winding axis of the coil 3 and in opposite directions. That is, the first portion of the first magnet M1 functions as a driving magnet as in the linear vibration motor 100.

When viewed from the first direction D, the second portion of one of the two first magnets M1 overlaps with a portion of the third magnet M3, and the second portion of the other of the two magnets M1 and the third magnet M3 overlap each other. 4 overlaps with a part of the magnet M4. In addition, one second portion and the third magnet M3 are arranged to repel each other, and the other second portion and the fourth magnet M4 are arranged to repel each other.

Thereby, the second portion of each of the two first magnets M1, 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. are doing. That is, in the linear vibration motor 100E, part of the first magnet M1 serves as the second magnet M2.

Here, as in the linear vibration motor 100, the first axis A1 passes through the center of gravity of the overlapping area of the two first magnets M1 when viewed from the first direction D, and extends in the first direction D. Let the axes be parallel. Also, 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 from the first direction D. , and is parallel to the first direction D. 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 .

In the linear vibrating motor 100E, similarly to the linear vibrating motor 100, when the vibrator 2 vibrates along the first direction D, the magnetic field of the magnets forming the magnetic spring mechanism causes the Lorentz force applied to the coil 3. It is possible to suppress the influence of

Further, in the linear vibration motor 100E, as described above, part of the first magnet M1 serves as 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, and the third magnet M3 and the fourth magnet M4 have the same shapes corresponding to them. Multiple magnets may be included.

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

10A to 10C are a plan view and a cross-sectional view corresponding to FIGS. 1A to 1C of the linear vibration motor 100F. Linear vibration motor 100F differs from linear vibration motor 100E of the fifth modification in the form of first magnet M1 and second magnet M2. Other configurations are the same as those of the linear vibrating motor 100E, and duplicate descriptions are omitted.

In the linear vibration motor 100F, similarly to the linear vibration motor 100E, the two first magnets M1 pass through the substrate 2a and are located in the first portion on the inner wall W2 side of the housing 1 and the housing 1. 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 to form an L shape between the first portion and the second portion. It should be noted that the first magnet M1 is preferably rounded and smoothly curved.

The first portions of the two first magnets M1 have their magnetic poles aligned in parallel with the winding axis of the coil 3 and opposite to each other. 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 faces the winding portion of the coil 3. facing each other. That is, the first portion of the first magnet M1 functions as a driving 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 overlaps with a portion of the third magnet M3, and the second portion of the other and the fourth magnet M3 overlap each other. overlaps with a part of the magnet M4. Also, the second portion of one of the two first magnets M1 and the third magnet M3 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 parts the north pole faces the north pole of the third magnet M3 and on the other side the south pole faces the south pole of the fourth magnet M4. there is

Thereby, the second portion of each of the two first magnets M1, 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. are doing. That is, in the linear vibrating motor 100F, as in the linear vibrating motor 100E, a part of the first magnet M1 serves as the second magnet M2.

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

In the linear vibrating motor 100F, similarly to the linear vibrating motor 100, when the vibrator 2 vibrates along the first direction D, the magnetic field of the magnet that constitutes the magnetic spring mechanism is converted into the Lorentz force applied to the coil 3. It is possible to suppress the influence of Also, in the linear vibration motor 100F, the number of magnets that constitute the linear vibration motor 100F can be reduced, as in the case of the linear vibration motor 100E.

Also in the linear vibration motor 100F, one and the other of the two first magnets M1 are plural, and the third magnet M3 and the fourth magnet M4 have the same shapes corresponding to them. Multiple magnets may be included.

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

11(A) to (C) are a plan view and a cross-sectional view corresponding to FIGS. 1(A) to (C) of the linear vibration motor 100G. Linear vibration motor 100G differs from linear vibration motor 100E of the fifth modification in the form of first magnet M1 and second magnet M2. Other configurations are the same as those of the linear vibrating motor 100E, and duplicate descriptions are omitted.

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

Linear vibration motor 100G further includes two soft magnetic bodies SF in addition to the configuration of linear vibration motor 100E. Fe, silicon steel, permalloy, amorphous magnetic alloy, etc. are used for the soft magnetic material SF, for example. 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 form an L-shaped constitutes 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. When the soft magnetic body SF is connected to the end of the second portion of the first magnet M1 as shown in FIG. 11B, the first magnet M1 and the soft magnetic body SF are smoothly connected. It is preferable to have a shape that forms a curved L shape.

The first portions of the two first magnets M1 have their magnetic poles aligned 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 faces the winding portion of the coil 3. facing each other. That is, the first portion of the first magnet M1 functions as a driving 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 portion of the third magnet M3, and the other overlaps with a portion of the fourth magnet M4. . Also, 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, the N pole of one of the two soft magnetic bodies SF magnetized by the first magnet M1 faces the N pole of the third magnet M3, and the S pole of the other is the fourth magnet. It faces the south pole of magnet M4.

Thus, 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. As shown in FIG. That is, in the linear vibration motor 100G, the soft magnetic material SF serves as the second magnet M2.

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

In the linear vibrating motor 100G, similarly to the linear vibrating motor 100, when the vibrator 2 vibrates along the first direction D, the magnetic field of the magnets forming the magnetic spring mechanism is converted into the Lorentz force applied to the coil 3. It is possible to suppress the influence of Further, in the linear vibration motor 100G, manufacturing costs can be reduced by replacing the magnets that constitute the linear vibration motor 100G with inexpensive soft magnetic materials.

Also in the linear vibration motor 100G, there are a plurality of one and the other of the two first magnets M1, each of which is connected to a soft magnetic body SF, and the third magnet M3 and the fourth magnet M4 are A plurality of magnets may be included, each having the same shape corresponding to them.

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

12A to 12C are a plan view and a cross-sectional view corresponding to FIGS. 1A to 1C of the linear vibration motor 100H. The linear vibration motor 100H differs from the linear vibration motor 100E of the fifth modification in that it further includes a sixth magnet M6. Other configurations are the same as those of the linear vibrating motor 100E, and duplicate descriptions are omitted.

In addition to the configuration of the linear vibration motor 100E, the linear vibration motor 100H further includes one sixth magnet M6 as a magnet that constitutes the magnetic spring mechanism. In the linear vibration motor 100H, the fourth magnet M4 sandwiches part of the two first magnets M1 along the first direction D described above with the third magnet M3. The fourth magnet M4 is fixed to the housing 1 in such a manner that it repels the part of the adjacent one of the two first magnets M1.

The sixth magnet M6 partially overlaps the third magnet M3 and the fourth magnet M4 when viewed in the first direction D, and is arranged to repel the third magnet M3 and the fourth magnet M4. , across the two first magnets M1.

In the linear vibrating motor 100H, similarly to the linear vibrating motor 100, when the vibrator 2 vibrates along the first direction D, the magnetic field of the magnets forming the magnetic spring mechanism causes the Lorentz force applied to the coil 3. It is possible to suppress the influence of

In addition, in the linear vibration motor 100H, as described above, the magnets constituting the magnetic spring mechanism include the third magnet M3 and the fourth magnet M4 in addition to the second portion of the first magnet M1. It further comprises a repelling 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, which is a ninth modification of linear vibration motor 100, which is a schematic form of the linear vibration motor according to this disclosure, will be described with reference to FIG.

13(A) to (C) are a plan view and a cross-sectional view corresponding to FIGS. 1(A) to (C) of the linear vibration motor 100I. The linear vibration motor 100I differs from the linear vibration motor 100H of the eighth modification in that it has two sixth magnets M6 and does not straddle the two first magnets M1. Since other configurations are the same as those of the linear vibration motor 100H, 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. The two sixth magnets M6 are aligned with each of the two first magnets M1 in a mutually repelling magnetic pole arrangement with the third and fourth magnets M3 and M4, respectively, as shown in FIG. 13(B). and does not straddle 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 one closer to the third magnet M3.

In the linear vibrating motor 100I, similarly to the linear vibrating motor 100, when the vibrator 2 vibrates along the first direction D, the magnetic field of the magnets forming the magnetic spring mechanism causes the Lorentz force applied to the coil 3. It is possible to suppress the influence of

Further, in the linear vibrating motor 100I, similarly to the linear vibrating motor 100H, it is possible to improve the performance of the magnetic spring mechanism.

In the linear vibration motor 100I shown in FIG. 13, the two sixth magnets M6 have different shapes. can be anisotropic.

-Tenth Modification of Schematic Form of Linear Vibration Motor-
A linear vibration motor 100J, which is a tenth modification of linear vibration motor 100, which is a schematic form of a linear vibration motor according to this disclosure, will be described with reference to FIG.

14(A) to (C) are a plan view and a cross-sectional view corresponding to FIGS. 1(A) to (C) of the linear vibration motor 100J. The linear vibrating motor 100J differs from the linear vibrating motor 100C of the third modification in the second magnet M2 and the fifth magnet M5. Since other configurations are the same as those of the linear vibration motor 100C, overlapping descriptions are omitted.

In the linear vibration motor 100J, the second magnet M2 has a rectangular parallelepiped shape and penetrates the substrate 2a. and a part of The first portion is arranged so that the magnetic field of the drive magnet is concentrated between the coil 3 and the drive magnet constituted by the first portion of the two first magnets M1 and the second magnet M2. It is arranged between the two first magnets M1.

As a result, the first portion of the second magnet M2 functions as a drive magnet like the fifth magnet M5 of the linear vibration motor 100C. That is, in the linear vibration motor 100J, part of the second magnet M2 is the fifth magnet M5. The two first magnets M1 and the first portion of the second magnet M2 form a broadly defined Halbach array as described above. A second portion of the second magnet M2 constitutes a magnetic spring mechanism against vibration of the vibrator 2 along the first direction D together with the third magnet M3 and the fourth magnet M4.

Here, as in the linear vibration motor 100, the first axis A1 passes through the center of gravity of the overlapping area of the two first magnets M1 when viewed from the first direction D, and extends in the first direction D. Let the axes be parallel. Also, the second axis A2 passes through the center of gravity of the region where the second portion of the second magnet M2, the third magnet M3 and the fourth magnet M4 overlap each other when viewed from the first direction D. , an axis parallel to the first direction D. 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 .

In the linear vibrating motor 100 J, similarly to the linear vibrating motor 100 , when the vibrator 2 vibrates along the first direction D, the magnetic field of the magnets forming the magnetic spring mechanism causes the Lorentz force applied to the coil 3 . It is possible to suppress the influence of

Further, in the linear vibration motor 100J, a part of the second magnet M2 is added to the drive magnet as described above, thereby forming a broadly defined Halbach array. The magnetic field generated by the magnet is concentrated, and the magnetic field acting on the coil 3 can be stronger than when 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 vibrating motor 100J by the vibrator 2 can be increased.

Further, in the linear vibration motor 100J, part of the second magnet M2 serves as 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, which is an eleventh modification of linear vibration motor 100, which is a schematic form of the linear vibration motor according to this disclosure, will be described with reference to FIG.

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

In the linear vibration motor 100K, the shape of 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 in the same manner as in the linear vibration motor 100J. and a second portion.

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

In the linear vibrating motor 100K, similarly to the linear vibrating motor 100, when the vibrator 2 vibrates along the first direction D, the magnetic field of the magnets forming the magnetic spring mechanism is converted into the Lorentz force applied to the coil 3. It is possible to suppress the influence of

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

-Embodiment of Linear Vibration Motor-
A linear vibrating motor 200 showing an embodiment of a linear vibrating motor according to this disclosure will be described with reference to FIGS. 16 and 17. FIG.

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

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

The housing 1 includes a first portion 1a and a second portion 1b. In the linear vibrating motor 200, the first portion 1a is a flat lid portion, and the second portion 1b is a container portion. Stainless steel such as SUS304 is used for the housing 1, for example. Note that the first portion 1a and the second portion 1b may be made of different materials.

The vibrator 2 is housed within 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. On the other hand, weight 2b also functions as a substrate.

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

For the first magnet M1, it is preferable to use an Nd--Fe--B system rare earth magnet that has a strong magnetic force and can increase the driving force of the vibrator 2. FIG. In addition, it is preferable to use Sm—Co-based rare earth magnets, which have a small rate of change in magnetic force with temperature and can stably exhibit the 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 redundant description is omitted.

The substrate 2a and weight portion 2b are made of, for example, W (tungsten), heavy alloys, alloys containing W such as ferro-tungsten, stainless steel such as SUS304, Al (aluminum), or alloys containing Al (aluminum) such as A2024 and A5052. 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 weight 2b may contain a material with 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 slot SL2 and the slot 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. are arranged along the first direction D as follows. Each magnet is fixed therein with, for example, an epoxy-based adhesive.

In order to avoid collision between the vibrator 2 and the housing 1, the slots SL2 are such that the distance between the inserted second magnet M2 and the third magnet M3 is equal to the distance between the housing 1 and the end surfaces of the substrate 2a and weight 2b. It is provided at one end of the substrate 2a as follows. Similarly, the slot SL3 is formed so that the space between the inserted fourth magnet M4 and the third magnet M3 is less than or equal to the space between the housing 1 and the end surfaces of the substrate 2a and the weight portion 2b. It is provided at the other end.

By inserting the second magnet M2 into the slot SL2 and the fourth magnet M4 into the slot SL3, each magnet can be easily fixed to the substrate 2a, and each magnet can be accurately fixed to the substrate 2a. be able to.

A slot SL1 to which the first magnet M1 is fixed is provided in the central portion of the weight portion 2b. The slot SL1 is a through hole formed in the weight portion 2b. By inserting the first magnet M1 into the slot SL1, it becomes easier to fix the first magnet M1 to the weight portion 2b, and the first magnet M1 can be fixed to the weight portion 2b with high accuracy. Note that the slot SL1 may not pass through the weight portion 2b.

After fixing the second magnet M2 to the slot SL2 of the substrate 2a, the fourth magnet M4 to the slot SL3, and the first magnet M1 to the slot SL1 of the weight portion 2b, the vibrator 2 is mounted on the substrate 2a. and the weight portion 2b are bonded together. Alternatively, the vibrator 2 may be formed by fixing the magnets to the substrate 2a and the weight portion 2b integrated together.

For the coil 3, for example, a coated Cu wire with a diameter of 0.06 mm wound about 50 turns is used. The coil 3 is connected to a stabilized power supply via a power amplifier by a lead-out wiring member such as a flexible substrate (the lead-out 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. As shown in FIG. The arrangement and shape of the coil 3 are the same as those of the linear vibration motor 100, and redundant description is omitted.

In the linear vibration motor 200, the vibrator 2 is supported by a sliding mechanism 4 including a first sliding mechanism 4a and a 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 ball bearings or the like, and friction is reduced when the moving body moves on the guide rail. The guide rail is fixed on the housing 1 side, and the moving body is fixed on 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. As in the linear vibration motor 100, the interval L1 between the first axis A1 and the coil 3 is shorter than the interval L2 between the second axis A2 and the coil 3.

Therefore, even in the linear vibration motor 200, when the vibrator 2 vibrates along 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. can. As a result, it is possible to suppress the decrease in the force applied to the vibrator 2 as the reaction force of the Lorentz force, and to suppress the decrease in the vibration of the linear vibrating motor 200 due to the vibrator 2 . In addition, since the vibrator 2 includes the weight portion 2b, the mass of the vibrator 2 is increased, and a large vibration is transmitted to the housing 1. As shown in FIG.

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

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

That is, the fifth magnet M5 is such that the magnetic field of the magnet array formed by the two first magnets M1 and the fifth magnet M5 is different from that of the drive magnet comprising the first magnet M1 and the fifth magnet M5. It is arranged so as to concentrate between it and the coil 3 . A magnet arrangement composed of the two first magnets M1 and the fifth magnet M5 is fixed to the slot SL1 of the weight portion 2b. Since other configurations are the same as those of the linear vibration motor 200, overlapping descriptions will be omitted.

In the linear vibrating motor 200A, similarly to the linear vibrating motor 200, when the vibrator 2 vibrates along the first direction D, the magnetic field of the magnets forming the magnetic spring mechanism is applied to the coil 3 by the Lorentz force. It is possible to suppress the influence of

In the linear vibration motor 200A, the fifth magnet M5 is added to the driving magnet, so that the magnetic field of the driving magnet concentrates between the driving magnet and the coil 3, and the driving magnet is only the first magnet M1. The magnetic field of the drive magnet acting on the coil 3 can be stronger 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 the reaction force of the Lorentz force can be increased, and the vibration of the linear vibrating motor 200A by the vibrator 2 can be increased.

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

20A to 20C are a plan view and a cross-sectional view corresponding to FIGS. 16A to 16C of the linear vibration motor 200B. Also, FIG. 21 is an exploded perspective view of the linear vibration motor 200B. The linear vibration motor 200B differs from the linear vibration motor 200 in the positional relationship among the second magnet M2, the third magnet M3 and the fourth magnet M4 and the structure of the weight portion 2b. Since other configurations are the same as those of the linear vibration motor 200, overlapping descriptions will be omitted.

In the linear vibration motor 200B, as shown in FIG. 20A, the second magnet M2 is provided at the center of the substrate 2a so that the magnetic pole arrangement direction is parallel to the first direction D. is fixed to slot SL2. The slots SL2 are two angular C-shaped members. The two members are separated along a direction perpendicular to the first direction D such 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 placed. A second magnet M2 is fixed therein with an epoxy-based adhesive, for example.

In the linear vibrating motor 200B, similarly to the linear vibrating motor 200, when the vibrator 2 vibrates along the first direction D, the magnetic field of the magnets forming the magnetic spring mechanism is applied to the coil 3 by the Lorentz force. It is possible to suppress the influence of

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

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

FIG. 22 is a see-through perspective view of the portable information terminal 1000. FIG. Also, FIG. 23 is a cross-sectional view of a main part of the portable information terminal 1000. As shown in FIG.

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

Portable information terminal 1000 uses linear vibration motor 100 according to this disclosure as a vibration generating device for tactile feedback or for confirming key operations, incoming calls, etc. by vibration. Note that the linear vibration motor used in the portable information terminal 1000 is not limited to the linear vibration motor 100, and may be any linear vibration motor according to this disclosure. In that case, it is possible to suppress the reduction in vibration of the portable information terminal due to the influence of the magnetic spring mechanism of the linear vibration motor.

As shown in FIG. 23, the second portion 1b of the housing 1 of the linear vibrating motor 100 includes a container body 1b1 and a fixing portion 1b2. The fixed portion 1b2 is a portion projecting 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 by screws B so that the bottom portion of the container portion main 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 portion 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 vibrating motor 100 is transmitted to the housing 1 as vibration of the third magnet M3 that constitutes the magnetic spring mechanism as described above. Therefore, when the portion of the housing 1 to which the third magnet M3 is fixed is in contact with 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 .

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.

Although a portable information terminal equipped with a display has been shown as an example of a schematic form of an electronic device using a linear vibrating motor according to this disclosure, it is not limited to this. An electronic device according to this disclosure need not have a display.

For example, electronic devices according to this disclosure include 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, laptop computers, televisions electronic devices such as remote controllers used for operations such as remote controllers, touch panel displays such as automatic teller machines, and various toys.

The embodiments disclosed in this specification are exemplary, and the invention according to this disclosure is not limited to the above-described embodiments and modifications. That is, the scope of the invention according to this disclosure is indicated by the scope of claims, and is intended to include all modifications within the meaning and scope of equivalence to the scope of claims. Moreover, various applications and modifications can be made within the above range.

INDUSTRIAL APPLICABILITY The invention according to this disclosure is applied to a linear vibration motor used, for example, as a vibration generating device for tactile feedback in electronic equipment or for confirming key operations, incoming calls, etc. by vibration. Skin sensory feedback includes, for example, expressing a tactile image corresponding to an action in a video game (for example, opening and closing a door, operating a steering wheel of a car, etc.) by vibration of a controller. However, skin sensory feedback other than this may be used.

In addition, the present invention is not limited to this, and can be applied to linear vibration motors used as actuators of robots, and the like.

100 linear vibration motor 1 housing (first housing)
2 Vibrator 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 (11)

a first housing;
a vibrator housed within the first housing and including at least one first and second magnet, respectively;
a coil fixed to the first housing and applying a driving force to the first magnet so that the vibrator can vibrate along a first direction;
at least one third magnet fixed to the first housing in a mutually repulsive arrangement with the second magnet along the first direction;
or the third magnet is included in the vibrator in a mutually repulsive arrangement with the third magnet so as to sandwich the third magnet along the first direction; at least one fixed to the first housing in a mutually repulsive arrangement with the second magnet to sandwich the second magnet along one direction with the third magnet; a fourth magnet;
When viewed from the first direction, the second to fourth magnets partially overlap each other,
When viewed from the first direction, the distance between the coil and a first axis passing through the center of gravity of the surface of the first magnet and parallel to the first direction is sometimes shorter than the interval between the coil and a second axis passing through the center of gravity of the region where the second to fourth magnets overlap each other and parallel to the first direction;
The first magnet includes two magnets whose magnetic poles are arranged in opposite directions in the winding axis direction of the coil and are arranged along the first direction,
the first axis passes through the center of gravity of the region where the two magnets overlap each other;
further comprising at least one fifth magnet;
The fifth magnet is arranged between the two magnets of the first magnet so that the magnetic field of the array of magnets constituted by the two magnets of the first magnet and the fifth magnet opposes the coil. It is arranged to concentrate on the side to do,
A linear vibration motor , wherein a portion of the second magnet serves as the fifth magnet . 2. The linear vibration motor of claim 1 , wherein said two magnets of said first magnet and said fifth magnet are arranged in a Halbach array. a first housing;
a vibrator housed within the first housing and including at least one first and second magnet, respectively;
a coil fixed to the first housing and applying a driving force to the first magnet so that the vibrator can vibrate along a first direction;
at least one third magnet fixed to the first housing in a mutually repulsive arrangement with the second magnet along the first direction;
or the third magnet is included in the vibrator in a mutually repulsive arrangement with the third magnet so as to sandwich the third magnet along the first direction; at least one fixed to the first housing in a mutually repulsive arrangement with the second magnet to sandwich the second magnet along one direction with the third magnet; a fourth magnet;
When viewed from the first direction, the second to fourth magnets partially overlap each other,
When viewed from the first direction, the distance between the coil and a first axis passing through the center of gravity of the surface of the first magnet and parallel to the first direction is sometimes shorter than the interval between the coil and a second axis passing through the center of gravity of the region where the second to fourth magnets overlap each other and parallel to the first direction;
The first magnet includes two magnets whose magnetic poles are arranged in opposite directions in the winding axis direction of the coil and are arranged along the first direction,
the first axis passes through the center of gravity of the region where the two magnets overlap each other;
A linear vibration motor , wherein a part of the first magnet serves as the second magnet . the first magnet comprises 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,
4. The linear vibration motor according to claim 3 , wherein the other of the two L-shaped magnets has one magnetic pole facing the coil and the other magnetic pole facing the magnetic pole of the fourth magnet. further comprising two soft magnetic bodies,
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 Two pseudo L-shaped magnets formed by connecting the other of the two soft magnetic bodies in an L-shaped manner,
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,
4. Linear vibration according to claim 3 , wherein the other of said two pseudo L-shaped magnets has one magnetic pole facing said coil and the other magnetic pole facing said fourth magnet magnetic pole. motor. further comprising at least one sixth magnet;
The fourth magnet is arranged along the first direction so as to sandwich a part of the two magnets of the first magnet between the third magnet and one of the first magnets. It is fixed to the first housing in an arrangement that repels each other with the part,
The sixth magnet partially overlaps the third and fourth magnets when viewed from the first direction, and the sixth magnet overlaps the first magnet so as to repel the third and fourth magnets. 4. A linear vibration motor according to claim 3 , connected across said two magnets of magnets. 7. The linear vibration motor according to claim 1 , wherein said vibrator further includes a plate-like substrate. 8. The linear vibration motor according to claim 1 , wherein said vibrator further includes a weight. A linear vibration motor according to any one of claims 1 to 8 and a second housing,
The electronic device, wherein the linear vibration motor is housed in the second housing. 10. The electronic device according to claim 9 , wherein a portion of said first housing to which said third magnet is fixed is in contact with said second housing. Equipped with an additional display,
11. The electronic device according to claim 9 , wherein a portion of said first housing to which said third magnet is fixed is in contact with said display.

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