Linear vibration motor and method for manufacturing linear vibration motor

Abstract

The length (A) of the cylinder (30) in the first direction, the length (B) of the housing (20) in the first direction, and the length (C) of the stator magnets (51, 52) in the first direction satisfy the relationship A < B < A + 2C. The housing (20) is provided with side walls (211, 212, 213) extending in a first direction, and end walls (214, 215) continuous with the side walls (211, 212, 213). The end walls (214, 215), first portions of the side walls (211, 212, 213) having a predetermined length connected to the end walls (214), and second portions of the side walls (211, 212, 213) having a predetermined length connected to the end walls (215) are magnetic bodies. The stator magnet (51) is attracted to the end wall (214) by magnetic force, and is positioned by a first end portion of the cylinder (30) forming the first open end. The stator magnet (52) is attracted to the end wall (215) by magnetic force, and is positioned by a second end portion of the cylinder (30) forming a second open end.

Description

TECHNICAL FIELD

[0001] The present application relates to a linear vibration motor, a manufacturing method of a linear vibration motor. BACKGROUND

[0002] A vibration actuator is described in Patent Literature 1. The vibration actuator is provided with a hollow cylindrical shaft.

[0003] Fixed magnets are arranged at both ends in the axial direction of the shaft. Inside the shaft, a movable magnet that is movable in the axial direction of the shaft is arranged between the fixed magnets at both ends.

[0004] The vibration actuator realizes a magnetic spring mechanism using repulsive force generated between the fixed magnets and the movable magnet.

[0005] PRIOR ART DOCUMENTS

[0006] PATENT LITERATURE

[0007] Patent Literature 1: Japanese Patent Application Publication No. 2019-195787 SUMMARY

[0008] PROBLEMS TO BE SOLVED BY THE INVENTION

[0009] However, in the conventional structure including the linear vibration motor vibration actuator shown in Patent Literature 1, since an adjustment member that adjusts the position of the fixed magnets in the axial direction, i.e., a fixed screw or the like, is provided, the length of the bracket in the axial direction is larger than the shaft, and it is difficult to downsize in the axial direction.

[0010] Thus, an object of the present application is to realize a linear vibration motor of a magnetic spring mechanism that is downsized in the axial direction.

[0011] SOLUTION TO PROBLEM

[0012] A linear vibration motor according to one aspect of the present application includes a cylinder having a through-hole with one end in a first direction being a first open end and the other end in the first direction being a second open end; a movable magnet housed in the through-hole of the cylinder and movable between the first open end and the second open end; a first stator magnet arranged at a position on a side of the first open end in the first direction from the movable magnet in a manner that generates repulsive force caused by magnetic force with respect to the movable magnet; a second stator magnet arranged at a position on a side of the second open end in the first direction from the movable magnet in a manner that generates repulsive force caused by magnetic force with respect to the movable magnet; a winding conductor arranged on an outer peripheral surface of the cylinder; and a housing that houses the winding conductor, the cylinder housing the movable magnet, the first stator magnet, and the second stator magnet.

[0013] A length A in the first direction of the cylinder, a length B in the first direction of the housing, and a length C in the first direction of the first stator magnet and the second stator magnet satisfy a relationship of A < B < A + 2C. The housing has a side wall extending in the first direction, a first end wall connected to the side wall, and a second end wall connected to the side wall. The first end wall, the second end wall, a first portion of the side wall of a predetermined length connected to the first end wall, and a second portion of the side wall of a predetermined length connected to the second end wall are magnetic bodies. The first stator magnet is attracted to the first end wall by a magnetic force and positioned by a first end portion of the cylinder forming the first open end. The second stator magnet is attracted to the second end wall by a magnetic force and positioned by a second end portion of the cylinder forming the second open end.

[0014] In addition, a linear vibration motor according to one aspect of the present application includes a cylinder having a through-hole with one end in a first direction being a first open end and the other end in the first direction being a second open end; a movable magnet housed in the through-hole of the cylinder and movable between the first open end and the second open end; a first stator magnet disposed at a position on a side of the first open end in the first direction from the movable magnet in a manner that generates a repulsive force caused by a magnetic force with respect to the movable magnet; a second stator magnet disposed at a position on a side of the second open end in the first direction from the movable magnet in a manner that generates a repulsive force caused by a magnetic force with respect to the movable magnet; a winding conductor disposed on an outer peripheral surface of the cylinder; and a housing that houses the winding conductor, the cylinder housing the movable magnet, the first stator magnet, and the second stator magnet.

[0015] A length A in the first direction of the cylinder, a length B in the first direction of the housing, and a length C in the first direction of the first stator magnet and the second stator magnet satisfy a relationship of A + 2C < B. The housing has a side wall extending in the first direction, a first end wall connected to the side wall, and a second end wall connected to the side wall. The first end wall, the second end wall, a first portion of the side wall of a predetermined length connected to the first end wall, and a second portion of the side wall of a predetermined length connected to the second end wall are magnetic bodies. The first end wall has a first recess opening to the first open end side, and the second end wall has a second recess opening to the second open end side. At least a portion of the first stator magnet is housed in the first recess, and the first stator magnet is attracted to the first end wall by a magnetic force. At least a portion of the second stator magnet is housed in the second recess, and the second stator magnet is attracted to the second end wall by a magnetic force.

[0016] In these configurations, the first stator magnet and the second stator magnet are reliably positioned at appropriate positions with respect to the housing at which a magnetic force for moving (vibrating) the movable magnet in the through-hole of the cylinder is continuously applied.

[0017] Effects of the Invention

[0018] According to the present application, a linear vibration motor of a magnetic spring mechanism that is small in the axial direction can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 (A) is an external perspective view of a linear vibration motor of Embodiment 1, Figure 1 (B) is an external perspective view of a cylinder of Embodiment 1.

[0020] Figure 2 is an exploded perspective view of a linear vibration motor of Embodiment 1.

[0021] Figure 3 (A) of FIG. Figure 3 (B) is a sectional view of a linear vibration motor of Embodiment 1.

[0022] Figure 4 is a conceptual diagram showing a magnetic flux ring generated by a stator magnet and a movable magnet.

[0023] Figure 5 (A) of FIG. Figure 5 (B) of FIG. Figure 5 (C) of FIG. Figure 5 (D) is a sectional view showing the state in each process of a manufacturing method of a linear vibration motor of Embodiment 1.

[0024] Figure 6 (A) of FIG. Figure 6 (B) is a sectional view showing the state in each process of a manufacturing method of a linear vibration motor of Embodiment 1.

[0025] Figure 7 is a side sectional view of a linear vibration motor of Embodiment 2.

[0026] Figure 8 is a side sectional view of a linear vibration motor of Embodiment 3.

[0027] Figure 9 is a side sectional view of a linear vibration motor of Embodiment 4.

[0028] Figure 10 (A) of FIG. Figure 10 (B) is a side sectional view of a linear vibration motor of Embodiment 5.

[0029] Figure 11 is a side sectional view of a linear vibration motor of Embodiment 6.

[0030] Figure 12 is a sectional view showing the state in each process of a manufacturing method of a linear vibration motor of Embodiment 6.

[0031] Figure 13 This is a cross-sectional view showing the state of each step in the manufacturing method of the linear vibration motor according to the sixth embodiment.

[0032] Figure 14 This is a side sectional view of the linear vibration motor according to the seventh embodiment.

[0033] Figure 15 This is a cross-sectional view showing the state of each step in the manufacturing method of the linear vibration motor according to the seventh embodiment. Detailed Implementation

[0034] [First Implementation]

[0035] The linear vibration motor and its manufacturing method according to the first embodiment of the present invention are described with reference to the accompanying drawings.

[0036] (Structure of linear vibration motor 10)

[0037] Figure 1 (A) is a perspective view of the linear vibration motor according to the first embodiment. Figure 1 (B) is a perspective view of the outer shell of the first embodiment. Figure 2 This is an exploded perspective view of the linear vibration motor according to the first embodiment. Figure 3 (A) Figure 3 (B) is a cross-sectional view of the linear vibration motor of the first embodiment. Figure 3 (A) represents Figure 1 The AA section shown in (A) represents a section parallel to the length direction of the linear vibration motor. Figure 3 (B) indicates Figure 3 The BB section shown in (A) represents a section orthogonal to the length direction of the linear vibration motor.

[0038] like Figure 1 (A) Figure 1 (B) Figure 2 , Figure 3 (A) Figure 3 As shown in (B), the linear vibration motor 10 includes a housing 20, a cylinder 30, winding conductors 41 and 42, a stator magnet 51 and 52, a movable magnet 60, and a flexible circuit board 70.

[0039] One of stator magnets 51 and 52 corresponds to the first stator magnet, and the other corresponds to the second stator magnet. The following description will illustrate the correspondence between stator magnet 51 and the first stator magnet, and between stator magnet 52 and the second stator magnet.

[0040] The shell 20 is rectangular in shape. The shell 20 is made of magnetic material. The shell 20 has a main body 21 and a cover 22.

[0041] The main body 21 is a rectangular parallelepiped shape, and is an open box on one side in the length direction (X-axis direction of the figure). More specifically, the main body 21 has side walls 211, 212, 213, end walls 214, 215 each of which is composed of a flat plate.

[0042] The side walls 211, 212, 213 have main surfaces parallel to the length direction. The main surface of the side wall 213 is orthogonal to the main surfaces of the side walls 211, 212. The side wall 213 is connected to the side walls 211, 212.

[0043] The end walls 214, 215 have main surfaces orthogonal to the length direction. The end wall 214 is connected to one end of the side walls 211, 212, 213 in the length direction. The end wall 215 is connected to one end of the side walls 211, 212, 213 in the length direction.

[0044] The lid 22 is a flat plate. The lid 22 is substantially the same shape as the side walls 211, 212, 213. The lid 22 is disposed so as to plug the opening of the main body 21. Thus, the case 20 has a substantially rectangular parallelepiped-shaped case inner space 210 surrounded by the main body 21 and the lid 22.

[0045] An opening 229 is formed in the lid 22. With the opening 229, the case inner space 210 can communicate with the outside space of the case 20.

[0046] The cylinder 30 has a cylindrical main body 31, a flange portion 321, and a flange portion 322. The cylinder 30 is composed of a non-magnetic body. The main body 31 has a first end portion E311 and a second end portion E312, and has a through-hole 310 that communicates an opening (first opening end) of the first end portion E311 and an opening (second opening end) of the second end portion E312.

[0047] The flange portions 321, 322 are flat plates of substantially polygonal shape. The flange portions 321, 322 are disposed on the outer peripheral surface of the cylindrical main body 31. The flat surface of the flange portion 321 and the flat surface of the flange portion 322 are orthogonal to the direction in which the main body 31 extends (the direction in which the through-hole 310 extends). The flange portions 321, 322 are disposed on the main body 31 in a shape that protrudes outward from the outer peripheral surface of the main body 31.

[0048] The flange portions 321, 322 are disposed at a position halfway along the length direction of the main body 31. More specifically, the flange portions 321, 322 are disposed at substantially the same distance from the first end portion E311 side and the second end portion E312 side, with the center of the length direction of the main body 31 as a reference.

[0049] At this time, the flange portion 321 and the flange portion 322 are arranged so that the winding conductors 41 and 42 (described later) are positioned at predetermined positions (for example, positions not overlapping the stator magnets 51 and 52 in the length direction) with respect to the main body 31.

[0050] The lengths of the flange portion 321 and the flange portion 322 in a direction orthogonal to the length direction (the Y direction in the drawing) are substantially the same as the distance between the side wall 213 of the housing 20 and the cover 22. The lengths of the flange portion 321 and the flange portion 322 in the other direction orthogonal to the length direction (the Z direction in the drawing) are substantially the same as the distance between the side wall 211 and the side wall 212 of the housing 20.

[0051] The faces of the flange portion 321 and the flange portion 322 that are close to or in contact with the side wall 211, the side wall 212, the side wall 213, and the cover 22 are flat.

[0052] The winding conductors 41 and 42 are each a shape in which a wire-shaped conductor is wound into a cylindrical shape. The winding conductors 41 and 42 are arranged along the outer peripheral surface of the main body 31 of the cylinder 30. In other words, the main body 31 penetrates the central opening portion of the winding conductor 41 and the central opening portion of the winding conductor 42.

[0053] The winding conductor 41 is arranged at a position of the main body 31 on the first end portion E311 side from the flange portion 321 and is in contact with the flange portion 321. The winding conductor 42 is arranged at a position of the main body 31 on the second end portion E312 side from the flange portion 322 and is in contact with the flange portion 322.

[0054] The stator magnets 51, 52, and the movable magnet 60 are each composed of a permanent magnet having strong magnetism. For example, the stator magnets 51, 52, and the movable magnet 60 are each composed of a neodymium magnet.

[0055] The stator magnets 51, 52, and the movable magnet 60 are each cylindrical. The heights of the stator magnets 51 and 52 are lower than the height of the movable magnet 60.

[0056] The shapes of the stator magnets 51, 52, and the movable magnet 60 as viewed in the respective height directions are substantially the same as the shape of the through-hole 310 of the main body 31 of the cylinder 30 as viewed in the axial direction. The sizes of the stator magnets 51, 52, and the movable magnet 60 as viewed in the respective height directions are such that these magnets can be accommodated in the through-hole 310.

[0057] The movable magnet 60 is housed in the through-hole 310 of the cylinder 30. The movable magnet 60 is housed in a state in which it is movable between the first end portion E311 (first open end) and the second end portion E312 (second open end).

[0058] The stator magnet 51 is disposed in a position overlapping the first end portion E311 in the length direction of the main body 31 of the cylinder 30 in a state in which it is housed in a portion in the height direction of the through-hole 310.

[0059] The stator magnet 52 is disposed in a position overlapping the second end portion E312 in the length direction of the main body 31 of the cylinder 30 in a state in which it is housed in a portion in the height direction of the through-hole 310.

[0060] At this time, the stator magnet 51 and the movable magnet 60 are disposed in a manner in which the same magnetic poles face each other. Also, the stator magnet 52 and the movable magnet 60 are disposed in a manner in which the same magnetic poles face each other.

[0061] For example, specifically, in the case shown in (A) of FIG. 10, Figure 2 , Figure 3 the movable magnet 60 is disposed in a manner in which the N-pole face 60N faces the first end portion E311 side and the S-pole face 60S faces the second end portion E312 side.

[0062] The stator magnet 51 is disposed in a manner in which the N-pole face 51N faces the movable magnet 60 side and the S-pole face 51S faces outward along the length direction from the first end portion E311 of the main body 31. Due to this, the stator magnet 51 is disposed in a manner in which it generates a repulsive force caused by magnetic force with respect to the movable magnet 60.

[0063] The stator magnet 52 is disposed in a manner in which the S-pole face 52S faces the movable magnet 60 side and the N-pole face 52N faces outward along the length direction from the second end portion E312 of the main body 31. Due to this, the stator magnet 52 is disposed in a manner in which it generates a repulsive force caused by magnetic force with respect to the movable magnet 60.

[0064] The flexible circuit board 70 has a conductor pattern connected to the winding conductor 41 and the winding conductor 42 by a wiring 400. The wiring 400 is constituted by the front end portions of the winding conductor 41 and the winding conductor 42.

[0065] The cylinder 30 in which the movable magnet 60 is housed and in which the plurality of winding conductors 41, 42 are disposed, the stator magnet 51, the stator magnet 52, and the flexible circuit board 70 are housed in the housing interior space 210 of the housing 20. At this time, the direction in which the cylinder 30 extends is parallel to the length direction of the housing 20. The direction in which the cylinder 30 extends is the length direction of the cylinder 30 and is the direction connecting the first end portion E311 and the second end portion E312 of the cylinder 30.

[0066] The cylinder 30 is arranged at a position where the center of the direction in which the cylinder 30 extends substantially coincides with the center of the length direction of the housing 20.

[0067] The stator magnet 51 is arranged so that the S-pole face 51S abuts against the inner wall face of the end wall 214 of the housing 20. Also, a portion of the N-pole face 51N side in the height direction of the stator magnet 51 is housed in the through-hole 310 of the main body 31 of the cylinder 30.

[0068] The stator magnet 52 is arranged so that the N-pole face 52N abuts against the inner wall face of the end wall 215 of the housing 20. Also, a portion of the S-pole face 52S side in the height direction of the stator magnet 52 is housed in the through-hole 310 of the main body 31 of the cylinder 30.

[0069] The flexible circuit board 70 penetrates the opening 229 of the cover 22, and a portion thereof is arranged in the housing internal space 210, and another portion thereof protrudes to the outside of the housing 20.

[0070] In this structure, an alternating-current drive signal is applied to the winding conductor 41 and the winding conductor 42. Thereby, the winding conductor 41 and the winding conductor 42 excite an electromagnetic field. This electromagnetic field acts on the movable magnet 60, and moves the movable magnet 60 in the length direction of the cylinder 30.

[0071] At this time, the movable magnet 60 receives a repulsive force caused by a magnetic force from the stator magnet 51 and the stator magnet 52 at both ends in the length direction. Thereby, the movable magnet 60 vibrates in the length direction. Thus, the linear vibration motor 10 can generate vibration using a magnetic spring mechanism.

[0072] This vibration is transmitted to the housing 20, and thereby the linear vibration motor 10 can impart vibration to an object or a person in contact with the housing 20.

[0073] In this structure, since the housing 20 is composed of a magnetic body, the stator magnet 51 is adsorbed to the end wall 214 using a magnetic force. Also, the stator magnet 52 is fixed to the end wall 215 using a magnetic force.

[0074] Specifically, Figure 4 is a diagram indicating the concept of a magnetic flux loop generated by the stator magnet and the movable magnet. Also, in Figure 4 , the stator magnet 52 is exemplified, but the stator magnet 51 can also generate the same magnetic flux loop.

[0075] As Figure 4 indicated, the magnetic field (magnetic line of force) from the stator magnet 52 returns to the stator magnet 52 through the end wall 215 of the housing 20 composed of a magnetic body closest thereto, and further through the side wall 211, the side wall 212, the side wall 213 (omitted from the drawing), and the cover 22 (omitted from the drawing).

[0076] At this time, a movable magnet 60 is located at the center of the length direction of the housing 20. The stator magnet 52 and the movable magnet 60 are in a relationship that generates a repulsive magnetic force. As a result, the magnetic field generated by the stator magnet 52 is enclosed around the periphery of the stator magnet 52, making it difficult for the magnetic field to leak to the movable magnet 60.

[0077] Therefore, the flux loop of the stator magnet 52 is shaped to a predetermined length through the end wall 215 and side walls 211, 212, 213 (not shown) of the housing 20 and the cover 22 (not shown), on the side connected to the end wall 215. As a result, the stator magnet 52 is attracted to the end wall 215 which is in planar contact.

[0078] The stator magnet 51 is also similarly attracted to the end wall 214 which is in planar contact.

[0079] Thus, stator magnets 51 and 52 are reliably fixed relative to the housing 20 at positions that can appropriately and continuously impart magnetic force for moving (vibrating) the movable magnet 60 within the through hole 310 of the cylinder 30. In this case, other components that would require significantly increased size for positioning are unnecessary, thus enabling miniaturization of the linear vibration motor 10. Furthermore, stator magnets 51 and 52 can be fixed to the housing 20 even without adhesives. Therefore, a linear vibration motor 10 with a magnetic spring mechanism that is easy to manufacture can be realized.

[0080] And, as Figure 3 As shown in (A), the length direction of the housing 20 and the extension direction of the cylinder 30 are defined as the first direction. The lengths L31 (length A in the first direction) of the cylinder 30, L21i (length B in the first direction) of the housing 20, L51 (length C in the first direction) of the stator magnet 51, and L52 (length C in the first direction) of the stator magnet 52 satisfy the following relationship. Furthermore, the length L21i of the housing 20 is the distance between the inner wall surface of the end wall 214 and the inner wall surface of the end wall 215.

[0081] L31<L21i<(L31+L51+L52)

[0082] That is, the length L21i of the shell 20 is longer than the length L31 of the cylinder 30. Moreover, the length L21i of the shell 20 is shorter than the combined length of the cylinder 30, the stator magnet 51, and the stator magnet 52.

[0083] Here, length L51 is the same as length L52. If we set it to length L50, then it satisfies...

[0084] L31<L21i<(L31+2L50)

[0085] The relationship is as follows. This corresponds to A < B < A + 2C in this application.

[0086] With this relationship, the stator magnet 51 is housed in a predetermined length portion on the first end E311 side of the cylinder 30, with the center of the housing 20 in the longitudinal direction approximately aligned with the center of the cylinder 30 in the direction of extension. Similarly, the stator magnet 52 is housed in a predetermined length portion on the second end E312 side of the cylinder 30.

[0087] Therefore, positioning of stator magnets 51 and 52 within a plane orthogonal to the length direction (the YZ plane in the figure) can be achieved more reliably. Consequently, a linear vibration motor 10 with a magnetic spring mechanism capable of more stable positioning of stator magnets 51 and 52 can be easily manufactured.

[0088] Furthermore, the linear vibration motor 10 more preferably satisfies L31 < L21i < (L31 + L50). Therefore, even if the cylinder 30 moves along the length of the housing 20, the stator magnets 51 and 52 will always remain within the through hole 310 of the cylinder 30. Consequently, the linear vibration motor 10 can more reliably achieve stable positioning of the stator magnets 51 and 52.

[0089] In addition, such as Figure 3 As shown in (B), in the linear vibration motor 10, the outer surfaces (circumferential surfaces) of the flange portion 321 and the outer surfaces (circumferential surfaces) of the flange portion 322 of the cylinder 30 abut against the inner wall surfaces of the plurality of side walls 211, 212, 213 of the housing 20 and the cover 22 in a planar manner. As a result, it is possible to suppress the case where the cylinder 30 rotates about the direction in which the cylinder 30 extends.

[0090] (Manufacturing method of linear vibration motor 10)

[0091] Figure 5 (A) Figure 5 (B) Figure 5 (C) Figure 5 (D) Figure 6 (A) Figure 6 (B) is a cross-sectional view showing the state of each step in the manufacturing method of the linear vibration motor according to the first embodiment.

[0092] First, prepare a cylindrical body 30 having a through hole 310 and flange portions 321 and 322 on its outer peripheral surface.

[0093] Next, as Figure 5As shown in (A) of FIG. 1, the winding conductor 41 is moved along the outer peripheral surface of the cylinder 30 (the main body 31) from the first end portion E311 of the cylinder 30. Also, the winding conductor 42 is moved along the outer peripheral surface of the cylinder 30 (the main body 31) from the second end portion E312 of the cylinder 30. The winding conductor 41 is positioned with respect to the cylinder 30 by abutting against the flange portion 321. The winding conductor 42 is positioned with respect to the cylinder 30 by abutting against the flange portion 322.

[0094] Next, as shown in (B) of FIG. 2, the winding conductor 41 and the winding conductor 42 are moved along the outer peripheral surface of the cylinder 30 (the main body 31) from the second end portion E312 of the cylinder 30. Figure 5 (B) of FIG. 2, the winding conductor 41 and the winding conductor 42 are moved along the outer peripheral surface of the cylinder 30 (the main body 31) from the second end portion E312 of the cylinder 30. Figure 5 (C) of FIG. 2, the winding conductor 41 and the winding conductor 42 are moved along the outer peripheral surface of the cylinder 30 (the main body 31) from the second end portion E312 of the cylinder 30. Figure 5 (D) of FIG. 2, the winding conductor 41 and the winding conductor 42 are moved along the outer peripheral surface of the cylinder 30 (the main body 31) from the second end portion E312 of the cylinder 30.

[0095] Next, as shown in (A) of FIG. 2, the winding conductor 41 and the winding conductor 42 are moved along the outer peripheral surface of the cylinder 30 (the main body 31) from the second end portion E312 of the cylinder 30. Figure 6 (A) of FIG. 2, the winding conductor 41 and the winding conductor 42 are moved along the outer peripheral surface of the cylinder 30 (the main body 31) from the second end portion E312 of the cylinder 30.

[0096] The cylinder 30 is inserted until the flange portion 321 and the flange portion 322 abut against the side wall 213.

[0097] When the cylinder 30 is inserted into the case 20, the stator magnet 51 is attracted to the end wall 214 by magnetic force, and the stator magnet 52 is attracted to the end wall 215 by magnetic force (refer to (B) of FIG. 3). Figure 6 (B) of FIG. 3).

[0098] Next, the end portions of the winding conductor 41 and the winding conductor 42 are drawn out of the opening of the case 20 by a flexible circuit board 70 (not shown), and the opening is sealed with the cover 22 of a magnetic body as shown in (B) of FIG. 4. Figure 6 (B) of FIG. 4).

[0099] By the manufacturing method as described above, the linear vibration motor 10 can also fix the stator magnet 51 and the stator magnet 52 without using an adhesive, and can be easily manufactured.

[0100] [2nd Embodiment]

[0101] A linear vibration motor and a manufacturing method of a linear vibration motor according to a 2nd embodiment of the present application will be described with reference to the drawings.

[0102] (Structure of Linear Vibration Motor 10A)

[0103] Figure 7 is a side sectional view of the linear vibration motor of the 2nd embodiment. As shown, the linear vibration motor 10A of the 2nd embodiment differs from the linear vibration motor 10 of the 1st embodiment in the structure of the case 20A, the positional relationship of the stator magnets 51 and 52 with respect to the cylinder 30. The other structure of the linear vibration motor 10A is the same as that of the linear vibration motor 10, and the description of the same parts is omitted. Figure 7

[0104] The case 20A has a main body 21A and a lid 22. The main body 21A differs from the main body 21 of the case 20 of the 1st embodiment in that it has a recess C214A and a recess C215A.

[0105] The recess C214A is formed in the end wall 214. The recess C214A is a shape recessed toward the outside of the case 20A. The recess C214A is formed at a position opposite the opening of the 1st end portion E311 of the cylinder 30.

[0106] The recess C215A is formed in the end wall 215. The recess C215A is a shape recessed toward the outside of the case 20A. The recess C215A is formed at a position opposite the opening of the 2nd end portion E312 of the cylinder 30.

[0107] The stator magnet 51 is housed in the recess C214A. The stator magnet 51 does not enter the through-hole 310 of the cylinder 30.

[0108] The stator magnet 52 is housed in the recess C215A. The stator magnet 52 does not enter the through-hole 310 of the cylinder 30.

[0109] In this structure, the length direction of the case 20A, the direction in which the cylinder 30 extends is set as the 1st direction, the length L31 in the 1st direction (the length A in the 1st direction), the length L21i of the case 20A in the 1st direction (the length B in the 1st direction), the length L51 of the stator magnet 51 in the 1st direction (the length C in the 1st direction), and the length L52 of the stator magnet 52 in the 1st direction (the length C in the 1st direction) satisfy the following relationships. Further, the length L21i of the case 20A is the distance between the inner wall surface of the portion of the end wall 214 which does not form the recess C214A and the inner wall surface of the portion of the end wall 215 which does not form the recess C215A.

[0110] (L31+L51+L52) < L21i

[0111] Here, the length L51 and the length L52 are the same, and if set as the length L50, the following is satisfied

[0112] (L31+2L50) < L21i​

[0113] This corresponds to A+2C

[0114] Even with such a structure, the stator magnet 51 is housed in the recess C214A (1st recess) and is attracted to the end wall 214 by magnetic force. The stator magnet 52 is housed in the recess C215A (2nd recess) and is attracted to the end wall 215 by magnetic force.

[0115] Thus, the linear vibration motor 10A can be easily manufactured to be a magnetic spring mechanism capable of more stable positioning of the stator magnet 51 and the stator magnet 52.

[0116] Thus, the linear vibration motor 10A can achieve the same effects as the linear vibration motor 10.

[0117] [3rd Embodiment]

[0118] A linear vibration motor of a 3rd embodiment of the present application will be described with reference to the drawings. Figure 8 is a side sectional view of the linear vibration motor of the 3rd embodiment.

[0119] As shown in Figure 8 The linear vibration motor 10B of the 3rd embodiment differs from the linear vibration motor 10 of the 1st embodiment in that it additionally has spacers SP51 and SP52.

[0120] The spacers SP51 and SP52 are plate-shaped and are made of a magnetic material. The spacer SP51 is disposed between the stator magnet 51 and the inner wall surface of the end wall 214 and is in abutment with the stator magnet 51 and the inner wall surface of the end wall 214. The spacer SP52 is disposed between the stator magnet 52 and the inner wall surface of the end wall 215 and is in abutment with the stator magnet 52 and the inner wall surface of the end wall 215.

[0121] According to the structure of the spacers SP51 and SP52 using such a magnetic material, the linear vibration motor 10B can achieve the same effects as the linear vibration motor 10. Further, the linear vibration motor 10B can adjust the positions of the stator magnet 51 and the stator magnet 52 relative to the movable magnet 60 in a direction parallel to the vibration direction of the movable magnet 60 to appropriate positions by the spacers SP51 and SP52.

[0122] Further, the linear vibration motor 10B can achieve the same effects as the linear vibration motor 10.

[0123] [4th Embodiment]

[0124] A linear vibration motor of a 4th embodiment of the present application will be described with reference to the drawings. Figure 9 is a side sectional view of the linear vibration motor of the 4th embodiment.

[0125] As shown in FIG. 1, the linear vibration motor 10 of the first embodiment has a structure in which the stator magnets 51 and 52 are arranged in the housing 20. The linear vibration motor 10 has the same structure as the linear vibration motor 10A of the second embodiment, and the same parts are omitted from the description. Figure 9 As shown in FIG. 1, the linear vibration motor 10 of the first embodiment has a structure in which the stator magnets 51 and 52 are arranged in the housing 20. The linear vibration motor 10 has the same structure as the linear vibration motor 10A of the second embodiment, and the same parts are omitted from the description.

[0126] The housing 20C has the main body 21C. The main body 21C has the side wall 211C, the side wall 212C, and the side wall 213C (omitted from the drawing).

[0127] The side wall 211C has the magnetic body portion 211Cd and the non-magnetic body portion 211Ci. The magnetic body portion 211Cd is present at the end portion of the side wall 211C that is connected to the end wall 214 and the end wall 215, and the non-magnetic body portion 211Ci is present between the magnetic body portions 211Cd at both ends. The magnetic body portion 211Cd corresponds to the "first portion" and the "second portion" of the present application, and the non-magnetic body portion 211Ci corresponds to the "third portion" of the present application.

[0128] The side wall 212C has the magnetic body portion 212Cd and the non-magnetic body portion 212Ci. The magnetic body portion 212Cd is present at the end portion of the side wall 212C that is connected to the end wall 214 and the end wall 215, and the non-magnetic body portion 212Ci is present between the magnetic body portions 212Cd at both ends.

[0129] The side wall 213C and the cover 22, which are omitted from the drawing, also have the same structure as the side wall 211C and the side wall 212C.

[0130] The length L21Cd of the one end portion of the magnetic body portion 211Cd and the magnetic body portion 212Cd in the first direction is preferably equal to or greater than the length L51 of the stator magnet 51 and the length L52 of the stator magnet 52 (L21Cd ≥ L51, L52: corresponds to the above C).

[0131] According to such a structure, the linear vibration motor 10C can have the same functional effects as the linear vibration motor 10.

[0132] Furthermore, when applying a structure where the housing 20A has recesses C214A and C215A, as in the linear vibration motor 10A of the second embodiment, to a structure where the housing 20C uses a non-magnetic body portion 211Ci, as in the linear vibration motor 10C of the fourth embodiment, the following dimensions are preferred. The length L21Cd in the first direction of one end of the magnetic body portion 211Cd and the magnetic body portion 212Cd is preferably a value obtained by subtracting the depth L214A of the recess C214A from the length L51 of the stator magnet 51 (corresponding to (CD) above in this application) and a value obtained by subtracting the depth L215C of the recess C215C from the length L52 of the stator magnet 52 (corresponding to (CD) above in this application) or higher.

[0133] Moreover, the linear vibration motor 10C can achieve the same effect as the linear vibration motor 10.

[0134] (Fifth implementation)

[0135] The linear vibration motor of the fifth embodiment of the present invention is described with reference to the accompanying drawings. Figure 10 (A) Figure 10 (B) is a side sectional view of the linear vibration motor of the fifth embodiment.

[0136] like Figure 10 As shown in (A), the linear vibration motor 10D1 of the fifth embodiment differs from the linear vibration motor 10 of the first embodiment in the structure of the cover 22G1. Figure 10 As shown in (B), the linear vibration motor 10D2 of the fifth embodiment differs from the linear vibration motor 10 of the first embodiment in the structure of the cover 22D2. The other structures of the linear vibration motors 10D1 and 10D2 are the same as those of the linear vibration motor 10, and the description of the same parts is omitted.

[0137] like Figure 10 As shown in (A), the cover 22D1 has a groove G22D for receiving or fitting the flange portion 321 and flange portion 322 of the main body 31 of the cylinder 30. By receiving or fitting the flange portion 321 and flange portion 322 into the groove G22D, the position of the main body 31 of the cylinder 30 relative to the housing 20D1 in the vibration direction of the movable magnet 60 is fixed.

[0138] like Figure 10 As shown in (B), the cover 22D2 has a protrusion P22D that can be clamped by the flange portion 321 and flange portion 322 of the main body 31 of the cylinder 30. By clamping the protrusion P22D with the flange portion 321 and flange portion 322, the position of the main body 31 of the cylinder 30 relative to the shell 20D2 in the vibration direction of the movable magnet 60 is fixed.

[0139] Thus, the linear vibration motor 10D1 and the linear vibration motor 10D2 can function in the same manner as the linear vibration motor 10, and can efficiently generate vibrations.

[0140] Further, in the present embodiment, the case where the groove or the protruding portion is formed in the lid is shown, but the groove or the protruding portion can be formed in the side wall of the main body of the case.

[0141] (6th Embodiment)

[0142] A linear vibration motor of a 6th embodiment of the present application will be described with reference to the drawings. Figure 11 is a side sectional view of the linear vibration motor of the 6th embodiment.

[0143] As Figure 11 shown, the linear vibration motor 10E of the 6th embodiment differs from the linear vibration motor 10 of the 1st embodiment in that an adhesive ADH is used. The other structures of the linear vibration motor 10E are the same as those of the linear vibration motor 10, and the description of the same parts will be omitted.

[0144] In the linear vibration motor 10E, the stator magnet 51 is adhered and fixed to the end wall 214 using the adhesive ADH. The stator magnet 52 is adhered and fixed to the end wall 215 using the adhesive ADH. Further, the adhesive ADH can also adhere to the cylinder 30.

[0145] (Method of Manufacturing Linear Vibration Motor 10E)

[0146] Figure 12 , Figure 13 is a sectional view showing the state in each process of the method of manufacturing the linear vibration motor of the 6th embodiment. Figure 12 The manufacturing method shown in Figure 13 is different from the manufacturing method shown in

[0147] In the case of the manufacturing method shown in Figure 12 , the adhesive ADH is applied to the 1st end portion E311 and the 2nd end portion E312 of the cylinder 30 in a state where the stator magnet 51 and the stator magnet 52 are inserted into the cylinder 30. At this time, the adhesive ADH is in an uncured state.

[0148] When the cylinder 30 is thus inserted into the housing 20 with the adhesive ADH applied thereto, the cylinder 30 is positioned at a predetermined position of the housing 20 as in the first embodiment. Thereafter, the stator magnet 51 is attracted to the end wall 214 by magnetic force, and the stator magnet 52 is attracted to the end wall 215 by magnetic force. At this time, since the adhesive ADH is applied to the first end portion E311 and the second end portion E312 of the cylinder 30, the adhesive ADH adheres to the stator magnet 51 and the end wall 214, and adheres to the stator magnet 52 and the end wall 215. Thereafter, the adhesive ADH is cured, whereby the stator magnet 51 is bonded to the end wall 214, and the stator magnet 52 is bonded to the end wall 215.

[0149] In Figure 13 the case of the manufacturing method shown in FIG. 9, first, the cylinder 30 is positioned at a predetermined position of the housing 20 in a state where the stator magnet 51 is attracted to the end wall 214 and the stator magnet 52 is attracted to the end wall 215. In this state, the adhesive ADH is applied to the stator magnet 51 and the stator magnet 52 using a nozzle. Thereafter, the adhesive ADH is cured, whereby the stator magnet 51 is bonded to the end wall 214, and the stator magnet 52 is bonded to the end wall 215.

[0150] According to this structure, the linear vibration motor 10E can function in the same manner as the linear vibration motor 10.

[0151] (Seventh Embodiment)

[0152] A linear vibration motor according to a seventh embodiment of the present application will be described with reference to the drawings. Figure 14 is a side sectional view of a linear vibration motor according to the seventh embodiment.

[0153] As Figure 14 shown in FIG. 10, the linear vibration motor 10F according to the seventh embodiment differs from the linear vibration motor 10A according to the second embodiment in that an adhesive ADH is used. The other structure of the linear vibration motor 10F is the same as that of the linear vibration motor 10A, and the description of the same parts will be omitted.

[0154] The linear vibration motor 10F is provided with the adhesive ADH on at least the wall surface of the recess C214F and the wall surface of the recess C215F of the housing 20F.

[0155] The stator magnet 51 is housed in the recess C214F and is bonded and fixed to the wall surface of the recess C214F by the adhesive ADH.

[0156] The stator magnet 52 is housed in the recess C215F and is bonded and fixed to the wall surface of the recess C215F by the adhesive ADH.

[0157] (Manufacturing Method of Linear Vibration Motor 10F)

[0158] Figure 15 is a sectional view showing the state in each process of the manufacturing method of the linear vibration motor of the seventh embodiment.

[0159] In Figure 15 In the case of the manufacturing method shown in FIG. 14, the adhesive ADH is applied to the recess C214F and the recess C215F of the main body 21F of the case 20F. At this time, the adhesive ADH is in an uncured state.

[0160] Next, the cylinder 30 in which the stator magnets 51 and 52 are inserted is inserted into the main body 21F.

[0161] When the cylinder 30 reaches a position overlapping the recess C214F and the recess C215F, the stator magnet 51 is drawn into the recess C214F and housed in the recess C214F to which the adhesive ADH is applied. Similarly, the stator magnet 52 is drawn into the recess C215F and housed in the recess C215F to which the adhesive ADH is applied.

[0162] Thereafter, the stator magnet 51 is adhered to the end wall 214 in the recess C214F and the stator magnet 52 is adhered to the end wall 215 in the recess C215F by curing of the adhesive ADH.

[0163] According to this structure, the linear vibration motor 10F can achieve the same functional effects as the linear vibration motor 10.

[0164] Further, as Figure 14 shown in FIG. 14, in the linear vibration motor 10F, the stator magnets 51 and 52 are fixed by the adhesive ADH, and a part of the stator magnet 51 and a part of the stator magnet 52 enter the through-hole 310 of the cylinder 30. Thereby, the stator magnets 51 and 52 are more reliably fixed to the appropriate positions.

[0165] A linear vibration motor comprising:

[0166] a cylinder having a through-hole whose one end in a first direction is a first open end and whose other end in the first direction is a second open end;

[0167] a movable magnet housed in the through-hole of the cylinder and capable of moving between the first open end and the second open end;

[0168] a first stator magnet disposed at a position closer to the first open end side of the movable magnet in the first direction in such a manner as to generate a repulsive force caused by a magnetic force with respect to the movable magnet;

[0169] a second stator magnet configured at a position on a side of the second opening end closer to the first direction than the movable magnet in a manner that generates repulsive force by magnetic force with respect to the movable magnet;

[0170] a winding conductor configured on an outer circumferential surface of the cylinder;

[0171] a housing that houses the winding conductor, the cylinder in which the movable magnet is housed, the first stator magnet, and the second stator magnet,

[0172] a length A of the cylinder in the first direction, a length B of the housing in the first direction, and a length C of the first stator magnet and the second stator magnet in the first direction satisfy a relationship of

[0173] A < B < A + 2C

[0174]

[0175] the housing includes a side wall extending in the first direction, a first end wall connected to the side wall, and a second end wall connected to the side wall and opposite the first end wall,

[0176] the first end wall, the second end wall, a first portion of the side wall of a predetermined length connected to the first end wall, and a second portion of the side wall of a predetermined length connected to the second end wall are magnetic bodies,

[0177] the first stator magnet is attracted to the first end wall by magnetic force and positioned by a first end portion of the cylinder forming the first opening end,

[0178] the second stator magnet is attracted to the second end wall by magnetic force and positioned by a second end portion of the cylinder forming the second opening end.

[0179] <2> The linear vibration motor according to <1>, wherein

[0180] a length A of the cylinder in the first direction, a length B of the housing in the first direction, and a length C of the first stator magnet and the second stator magnet in the first direction satisfy a relationship of

[0181] A < B < A + C

[0182]

[0183] <3> The linear vibration motor according to <1> or <2>, wherein

[0184] ​​The housing has a third portion disposed between the first portion and the second portion of the side wall and connected to the first portion and the second portion,

[0185] The third portion is composed of a non-magnetic body,

[0186] The length in the first direction of the first portion and the second portion is the C or more.

[0187] <4> The linear vibration motor according to any one of <1> to <3>, wherein,

[0188] The first end wall has a first recess that opens to the first open end side and is opposite the first open end,

[0189] The second end wall has a second recess that opens to the second open end side and is opposite the second open end,

[0190] The first stator magnet is housed in the first recess,

[0191] The second stator magnet is housed in the second recess.

[0192] <5> A linear vibration motor comprising:

[0193] A cylinder having a through-hole with one end in a first direction being a first open end and the other end in the first direction being a second open end;

[0194] A movable magnet housed in the through-hole of the cylinder and capable of moving between the first open end and the second open end;

[0195] A first stator magnet disposed at a position closer to the first open end side than the movable magnet in the first direction in such a manner that repulsive force caused by magnetic force is generated with respect to the movable magnet;

[0196] A second stator magnet disposed at a position closer to the second open end side than the movable magnet in the first direction in such a manner that repulsive force caused by magnetic force is generated with respect to the movable magnet;

[0197] A winding conductor disposed on an outer peripheral surface of the cylinder; and

[0198] A housing that houses the winding conductor, the cylinder in which the movable magnet is housed, the first stator magnet, and the second stator magnet, wherein,

[0199] The length A of the cylinder in the first direction, the length B of the housing in the first direction, and the length C of the first stator magnet and the second stator magnet in the first direction satisfy

[0200] A + 2C < B

[0201] a relationship,

[0202] the housing has a side wall extending in the first direction, a first end wall connected to the side wall, and a second end wall connected to the side wall and opposite the first end wall,

[0203] the first end wall, the second end wall, a first portion of the side wall of a predetermined length connected to the first end wall, and a second portion of the side wall of a predetermined length connected to the second end wall are magnetic bodies,

[0204] the first end wall has a first recess portion opened to the first open end side,

[0205] the second end wall has a second recess portion opened to the second open end side,

[0206] at least a portion of the first stator magnet is housed in the first recess portion, and the first stator magnet is attracted to the first end wall by a magnetic force,

[0207] at least a portion of the second stator magnet is housed in the second recess portion, and the second stator magnet is attracted to the second end wall by a magnetic force.

[0208] <6> The linear vibration motor according to <5>, wherein

[0209] the housing has a third portion disposed between and connected to the first portion and the second portion of the side wall,

[0210] the third portion is composed of a non-magnetic body,

[0211] with respect to depths D of the first recess portion and the second recess portion,

[0212] lengths of the first portion and the second portion in the first direction are the (C-D) or more.

[0213] <7> The linear vibration motor according to any one of <1> to <6>, wherein

[0214] the housing is a cuboid shape,

[0215] the cylindrical body has a flange portion that positions the winding conductor,

[0216] the flange portion is a polygonal shape when viewed in the first direction,

[0217] The polygonal shaped outer side surface of the side wall and the flange portion of the housing are in contact.

[0218] <8> The linear vibration motor according to any one of <1> to <7>, wherein

[0219] The first stator magnet and the second stator magnet are fixed to the housing with an adhesive.

[0220] <9> A manufacturing method of a linear vibration motor, comprising the following steps:

[0221] A cylindrical body having a through hole and a flange portion having a polygonal shape on an outer peripheral surface is prepared;

[0222] A winding conductor is moved along the outer peripheral surface of the cylindrical body from an end portion of the cylindrical body, and the winding conductor is positioned with the flange portion;

[0223] While plugging one end of the through hole of the cylindrical body, the first stator magnet, the movable magnet, and the second stator magnet are inserted into the through hole in this order from the other end so as to become an arrangement of magnetic poles in which the movable magnet and the first stator magnet repel each other and the movable magnet and the second stator magnet repel each other;

[0224] The cylindrical body in which the winding conductor is positioned and the first stator magnet, the movable magnet, and the second stator magnet are inserted is inserted into a cuboid-shaped housing having an opening in one of the side surfaces along the length direction from the opening; and

[0225] An end portion of the winding conductor is led out from the opening of the housing, and the opening is sealed with a cover of a magnetic body, wherein

[0226] A length A in the length direction of the cylindrical body, a length B in the length direction of the housing, and a length C in the insertion direction of the first stator magnet and the second stator magnet satisfy the relationship

[0227] A < B < A + 2C

[0228]

[0229] The rotation of the cylindrical body in the housing is restricted by abutting the flange portion having a polygonal shape against an inner wall surface of the housing,

[0230] The first stator magnet and the second stator magnet are restricted in movement in a plane orthogonal to the length direction by the cylindrical body, and are restricted in movement in the length direction by repulsive magnetic force between the first stator magnet and the second stator magnet and the movable magnet.

[0231] ​Reference Signs List

[0232] 10, 10A, 10B, 10C, 10D, 10E, 10F, linear vibration motor; 20, 20A, 20C, 20D, 20F, housing; 21, 21A, 21C, 21F, main body; 22, 22A, cover; 30, cylinder; 31, main body; 41, 42, winding conductor; 51, 52, stator magnet; 60, movable magnet; 51N, 52N, 60N, N-pole face; 51S, 52S, 60S, S-pole face; 70, flexible circuit board; 210, housing inner space; 211, 212, 213, side wall; 214, 215, end wall; 229, opening; 310, through hole; 400, wiring; C214A, C214F, C215A, C215F, C22B, recess; E311, 1st end portion; E312, 2nd end portion; F214, F215, housing wall.

Claims

1. A linear vibration motor, comprising: A cylindrical body having a through hole with one end in a first direction being a first open end and the other end in the first direction being a second open end; A movable magnet, housed in the through hole of the cylinder, is movable between the first opening end and the second opening end; The first stator magnet is positioned on the side of the first opening end in the first direction relative to the movable magnet, in a manner that generates a repulsive force caused by magnetic force relative to the movable magnet. The second stator magnet is positioned on the side of the second opening end in the first direction relative to the movable magnet, in a manner that generates a repulsive force caused by magnetic force relative to the movable magnet. A winding conductor disposed on the outer peripheral surface of the cylinder; and The housing includes the winding conductors, a cylindrical body housing the movable magnet, the first stator magnet, and the second stator magnet. The length A of the cylindrical body in the first direction, the length B of the shell in the first direction, and the length C of the first stator magnet and the second stator magnet in the first direction satisfy the following: A < B < A + 2C Relationship, The housing includes: a sidewall extending along the first direction; a first end wall connected to the sidewall; and a second end wall connected to the sidewall and opposite to the first end wall. The first end wall, the second end wall, a first portion of a predetermined length of the side wall connected to the first end wall, and a second portion of a predetermined length of the side wall connected to the second end wall are magnetic materials. The first stator magnet is magnetically attracted to the first end wall and positioned using the first end of the cylinder that forms the first opening. The second stator magnet is magnetically attracted to the second end wall and positioned by the second end of the cylinder that forms the second opening.

2. The linear vibration motor according to claim 1, wherein, The length A of the cylindrical body in the first direction, the length B of the shell in the first direction, and the length C of the first stator magnet and the second stator magnet in the first direction satisfy the following: A < B < A + C The relationship.

3. The linear vibration motor according to claim 1 or 2, wherein, The housing includes a third portion disposed between the first portion and the second portion of the sidewall, and connected to the first portion and the second portion. The third part is composed of a non-magnetic material. The length of the first part and the second part in the first direction is greater than or equal to C.

4. The linear vibration motor according to any one of claims 1 to 3, wherein, The first end wall has a first recess, which opens toward and is opposite to the first open end. The second end wall has a second recess, which opens toward and is opposite to the second open end. The first stator magnet is housed in the first recess. The second stator magnet is housed in the second recess.

5. A linear vibration motor, comprising: A cylindrical body having a through hole with one end in a first direction being a first open end and the other end in the first direction being a second open end; A movable magnet, housed in the through hole of the cylinder, is movable between the first opening end and the second opening end; The first stator magnet is positioned on the side of the first opening end in the first direction relative to the movable magnet, in a manner that generates a repulsive force caused by magnetic force relative to the movable magnet. The second stator magnet is positioned on the side of the second opening end in the first direction relative to the movable magnet, in a manner that generates a repulsive force caused by magnetic force relative to the movable magnet. A winding conductor disposed on the outer peripheral surface of the cylinder; and The housing includes the winding conductors, a cylindrical body housing the movable magnet, the first stator magnet, and the second stator magnet. The length A of the cylindrical body in the first direction, the length B of the shell in the first direction, and the length C of the first stator magnet and the second stator magnet in the first direction satisfy the following: A + 2C < B Relationship, The housing includes: a sidewall extending along the first direction; a first end wall connected to the sidewall; and a second end wall connected to the sidewall and opposite to the first end wall. The first end wall, the second end wall, a first portion of a predetermined length of the side wall connected to the first end wall, and a second portion of a predetermined length of the side wall connected to the second end wall are magnetic materials. The first end wall has a first recess that opens toward the first open end side. The second end wall has a second recess that opens toward the second open end side. At least a portion of the first stator magnet is housed in the first recess, and the first stator magnet is magnetically attracted to the first end wall. At least a portion of the second stator magnet is housed in the second recess, and the second stator magnet is magnetically attracted to the second end wall.

6. The linear vibration motor according to claim 5, wherein, The housing includes a third portion disposed between the first portion and the second portion of the sidewall, and connected to the first portion and the second portion. The third part is composed of a non-magnetic material. Relative to the depth D of the first recess and the second recess, The length of the first part and the second part in the first direction is greater than (C - D).

7. The linear vibration motor according to any one of claims 1 to 6, wherein, The shell is rectangular in shape. The cylindrical body has a flange portion for positioning the winding conductor. The flange portion is polygonal in shape when viewed along the first direction. The sidewall of the housing and the outer polygonal surface of the flange are in contact.

8. The linear vibration motor according to any one of claims 1 to 7, wherein, The first stator magnet and the second stator magnet are fixed to the housing using an adhesive.

9. A method for manufacturing a linear vibration motor, comprising the following steps: Prepare a cylindrical body with a through hole and a polygonal flange on its outer circumferential surface; The winding conductor is moved from the end of the cylinder along the outer peripheral surface of the cylinder, and the winding conductor is positioned by the flange portion; While blocking one end of the through hole of the cylinder, from the other end, the first stator magnet, the movable magnet, and the second stator magnet are inserted into the through hole in the order of the first stator magnet, the movable magnet, and the second stator magnet, in such an arrangement that the magnetic poles of the movable magnet and the first stator magnet repel each other and the movable magnet and the second stator magnet repel each other. The cylinder in which the winding conductor is positioned and the first stator magnet, the movable magnet, and the second stator magnet are inserted is inserted from the opening relative to a cuboid-shaped shell with one side opening along the length direction of the magnetic body. as well as The end of the winding conductor is led out from the opening of the housing, and the opening is sealed by a magnetic cover, wherein... The length A of the cylindrical body in the longitudinal direction, the length B of the shell in the longitudinal direction, and the length C of the first stator magnet and the second stator magnet in the insertion direction satisfy the following: A < B < A + 2C Relationship, The rotation of the cylinder within the housing is restricted by abutting the polygonal flange against the inner wall surface of the housing. The first stator magnet and the second stator magnet are restricted by the cylinder to move in a plane orthogonal to the length direction, and their movement along the length direction is restricted by the repulsive magnetic force between them and the movable magnet.

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