Vibration motor

Abstract

To provide a vibration motor which suppresses deterioration of characteristics and suppresses noise while suppressing size increase of its shape.SOLUTION: A cylindrical holder 30 comprises a through hole 300 with both ends opened, and a movable element magnet 40 is accommodated therein. Stator magnets 51 and 52 are arranged at one end and the other end of the cylindrical holder by sandwiching the movable element magnet therebetween in a first direction as a movable direction of the movable element magnet. Spacers 71 and 72 comprise step parts in which the ends of the cylindrical holder are accommodated and which form inner surfaces contacting outer surfaces of the ends of the cylindrical holder. The stator magnets are fixed to the cylindrical case so that at least a part thereof is accommodated in the cylindrical holder by using the step parts of the spacers. The stator magnets are fixed to the cylindrical case so that at least a part thereof is accommodated in the cylindrical holder by using the spacers.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to the structure of a vibration motor.

Background Art

[0002] Patent Document 1 describes a resonance motor. The resonance motor includes a housing, a stator magnet, and a rotor magnet. The rotor magnet is housed in the housing. The stator magnets are arranged at both ends of the housing.

[0003] In a motor having such a configuration, in order to increase the acceleration of the rotor magnet within limited dimensions, a configuration in which a drive coil disposed on the outer surface of the housing is brought as close as possible to the rotor magnet can be considered.

[0004] In the configuration of Patent Document 1, two permanent magnets are used for the rotor magnet, and the two permanent magnets are adhered with an adhesive in a direction in which they repel each other with a spacer or the like interposed therebetween. In this case, a recess that is recessed from the outer surface is provided substantially at the center in the extending direction of the housing (the vibration direction of the rotor magnet), and the drive coil is disposed in the recess. Thereby, the drive coil and the rotor magnet approach each other.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] When the configuration of Patent Document 1 is used, since two permanent magnets are used for the rotor magnet, the number of components of the motor increases and the housing becomes longer.

[0007] On the other hand, when the mover magnet is composed of a single permanent magnet, drive coils need to be arranged at both ends in the extending direction of the housing. Then, in order to bring the drive coils closer to the mover magnet, it is necessary to provide recesses at both ends of the housing.

[0008] In this case, the ends of the housing become thin, and the mechanical strength of the ends of the housing decreases. If the mechanical strength of the housing cannot be ensured, there are problems such as resistance when the mover magnet slides, which conversely reduces the acceleration, or the noise becomes large.

[0009] Therefore, an object of the present invention is to suppress deterioration of characteristics as a vibration motor and suppress noise while suppressing an increase in size of the shape.

Means for Solving the Problems

[0010] A vibration motor according to an embodiment of the present invention includes a single mover magnet, a cylindrical holder, a drive winding, a first stator magnet, a second stator magnet, a first spacer, a second spacer, a cylindrical case, and a terminal pin. The cylindrical holder has a through-hole with both ends open, the mover magnet is housed in the through-hole, and has a flange portion at the central portion of the outer surface. The drive winding is wound around both sides of the cylindrical holder on the outer periphery, sandwiching the flange portion. The first stator magnet and the second stator magnet are arranged at one end and the other end of the cylindrical holder with the mover magnet sandwiched therebetween so as to generate repulsive magnetic forces against the mover magnet in a first direction which is the moving direction of the mover magnet. The first spacer and the second spacer have insulating properties. The cylindrical case houses the cylindrical holder, the drive winding, the first stator magnet, the second stator magnet, the first spacer, and the second spacer. The terminal pin is connected to the drive winding. The cylindrical case is composed of a metal material and includes a main body portion with both ends open in the extending direction, a first lid member arranged at one end of the main body portion in the extending direction, and a second lid member arranged at the other end of the main body portion in the extending direction.

[0011] The first spacer is disposed at one end of the main body portion, and the second spacer is disposed at the other end of the main body portion. The first spacer and the second spacer have a stepped portion that forms an inner surface on which the end portion of the cylindrical holder is received and that abuts against the outer surface of the end portion of the cylindrical holder. At least one of the first spacer and the second spacer has a terminal pin passing therethrough. The first stator magnet is fixed to the cylindrical case such that at least a part thereof is received in the cylindrical holder by using the stepped portion of the first spacer. The second stator magnet is fixed to the cylindrical case such that at least a part thereof is received in the cylindrical holder by using the second spacer.

[0012] In this configuration, since the drive winding is disposed in the thick-and-thin portion (the portions on both sides of the flange portion) of the cylindrical holder, the rotor magnet and the drive winding approach each other. Further, the thick-and-thin portion of the cylindrical holder is fixed while abutting against the inner surfaces of the stepped portions of the first spacer and the second spacer. Thereby, the low strength of the thick-and-thin portion of the cylindrical holder is ensured by the first spacer and the second spacer.

Advantages of the Invention

[0013] According to this invention, while suppressing an increase in size of the shape, deterioration of characteristics as a vibration motor can be suppressed and noise can be suppressed.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

MODE FOR CARRYING OUT THE INVENTION

[0015] [First Embodiment] A vibration motor according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of a vibration motor according to the first embodiment. FIG. 2 is a side cross-sectional view of a vibration motor according to the first embodiment.

[0016] Note that in the drawings described in each embodiment including FIGS. 1 and 2, there may be parts where dimensions are emphasized appropriately for easy understanding of the configuration. Also, although the order of the reference numerals is reversed, the specific configuration will be described in order from the center side of the vibration motor 10.

[0017] (Each component constituting the vibration motor 10 and its shape) As shown in FIGS. 1 and 2, the vibration motor 10 includes a cylindrical case 20, a cylindrical holder 30, a rotor magnet 40, a plurality of stator magnets 51, 52, a plurality of drive windings 61, 62, and a plurality of spacers 71, 72. The stator magnet 51 corresponds to the "first stator magnet", and the stator magnet 52 corresponds to the "second stator magnet". The spacer 71 corresponds to the "first spacer", and the spacer 72 corresponds to the "second spacer".

[0018] The rotor magnet 40 and the plurality of stator magnets 51, 52 are permanent magnets, for example, magnets with strong magnetic force such as neodymium magnets. The rotor magnet 40 and the plurality of stator magnets 51, 52 are cylindrical. The diameters of the rotor magnet 40 and the plurality of stator magnets 51, 52 are substantially the same.

[0019] The rotor magnet 40 has an N-pole surface N40 and an S-pole surface S40. The stator magnet 51 has an N-pole surface N51 and an S-pole surface S51. The stator magnet 52 has an N-pole surface N52 and an S-pole surface S52.

[0020] The cylindrical holder 30 includes a main body portion 31 and a flange portion 32. The cylindrical holder 30 is made of a material that allows a magnetic field to pass through, for example, an insulating resin. The main body portion 31 and the flange portion 32 are integrally formed.

[0021] The main body portion 31 has a cylindrical shape extending in the first direction and has a first end face E31, a second end face E32, an outer surface SO31, and an inner surface SI30. The main body portion 31 has a through hole 300 that penetrates between the first end face E31 and the second end face E32. The inner surface SI30 is formed by this through hole 300. The diameter of the through hole 300 is substantially the same as the diameters of the mover magnet 40 and the plurality of stator magnets 51, 52 within a range in which the mover magnet 40 and the plurality of stator magnets 51, 52 can be accommodated. The through hole 300 has the same diameter at any position in the first direction.

[0022] The flange portion 32 has a cylindrical shape and protrudes outward from the outer surface SO31 of the main body portion 31 in the circumferential direction. The flange portion 32 is arranged so as to include the center of the main body portion 31 in the first direction. Thereby, the cylindrical holder 30 has thick and thin portions on both sides of the flange portion 32 in the first direction.

[0023] The mover magnet 40 is accommodated in the through hole 300 of the cylindrical holder 30. At this time, the mover magnet 40 is accommodated such that the N - pole face N40 faces the first end face E31 side and the S - pole face S40 faces the second end face E32 side.

[0024] The cylindrical case 20 includes a main body portion 21, a first lid member 221, and a second lid member 222. The main body portion 21, the first lid member 221, and the second lid member 222 are made of metal. Note that the main body portion 21, the first lid member 221, and the second lid member 222 do not necessarily have to be made only of metal as long as they are made of a material having a predetermined magnetism. The predetermined magnetism is magnetism that suppresses the transmission of a magnetic field or magnetism with which a permanent magnet adheres with a predetermined strength.

[0025] The main body portion 21 has a cylindrical shape and includes a through hole 210.

[0026] The first lid member 221 is disc-shaped. The first lid member 221 is disposed at one end of the main body 21 in the first direction and closes one opening of the through hole 210. The first lid member 221 is provided with an opening OP241. The opening OP241 is sized such that the terminal pins 81 and 82 described later can be inserted therethrough respectively.

[0027] The second lid member 222 is disc-shaped. The second lid member 222 is disposed at the other end of the main body 21 in the first direction and closes the other opening of the through hole 210.

[0028] Thereby, a case internal space surrounded by the main body 21, the first lid member 221, and the second lid member 222 is formed in the cylindrical case 20.

[0029] The plurality of drive windings 61, 62 are formed of wound linear conductors covered with an insulating film. The plurality of drive windings 61, 62 are wound on both sides of the outer periphery of the cylindrical holder 30 with the flange portion 32 interposed therebetween.

[0030] More specifically, the drive winding 61 is disposed on the outer surface SO31 of the main body 31 of the cylindrical holder 30 on the side of the first end face E31 rather than the flange portion 32. At this time, the drive winding 61 is disposed at a position separated from the first end face E31 by a predetermined distance.

[0031] The drive winding 62 is disposed on the outer surface SO31 of the main body 31 of the cylindrical holder 30 on the side of the second end face E32 rather than the flange portion 32. At this time, the drive winding 62 is disposed at a position separated from the second end face E32 by a predetermined distance.

[0032] The spacer 71 is made of an insulating material. The spacer 71 is disc-shaped with a predetermined height. The spacer 71 is provided with an outer surface F710. The diameter of the spacer 71, in other words, the diameter of the circle formed by the outer surface F710, is the same as the inner diameter of the main body 21 of the cylindrical case 20 (the diameter of the circle formed by the inner surface).

[0033] The spacer 71 includes a through-hole C711 and a recess C712. The through-hole C711 penetrates both main surfaces (the surfaces with a circular outer shape) of the spacer 71, and is circular when viewed in the direction (the first direction) perpendicular to the main surface. The diameter of the through-hole C711 is substantially the same as the diameter of the stator magnet 51.

[0034] The through-hole C711 has an inner surface F711. The center of the through-hole C711 when viewed in the first direction coincides with the center of the spacer 71. The through-hole C711 corresponds to the "through-hole for the first stator magnet".

[0035] The recess C712 is recessed from one main surface and is circular when viewed in the direction (the first direction) perpendicular to the one main surface. The diameter of the recess C712 is larger than the diameter of the through-hole C711 and is substantially the same as the diameter of the outer shape (the diameter of the circle formed by the outer surface SO31) of the end portion (the thin and thick portion) near the first end surface E31 of the cylindrical holder 30.

[0036] The recess C712 has an inner surface F712 and a bottom surface B712. The center of the recess C712 when viewed in the first direction coincides with the centers of the spacer 71 and the through-hole C711.

[0037] As a result, the through-hole C711 has a shape that penetrates the bottom surface B712 of the recess C712 and the other main surface of the spacer 71, and the spacer 71 has a stepped portion. At this time, the height of the through-hole C711 is lower than the height of the stator magnet 51.

[0038] The spacer 72 is made of an insulating material. The spacer 72 is in the shape of a disc with a predetermined height. The shape of the spacer 72 is the same as the shape of the spacer 71. The spacer 72 has an outer surface F720. The diameter of the spacer 72, in other words, the diameter of the circle formed by the outer surface F720, is the same as the inner diameter (the diameter of the circle formed by the inner surface) of the main body portion 21 of the cylindrical case 20.

[0039] The spacer 72 includes a through hole C721 and a recess C722. The through hole C721 penetrates both main surfaces (surfaces with a circular outer shape) of the spacer 72 and is circular when viewed in a direction (first direction) orthogonal to the main surfaces. The diameter of the through hole C721 is substantially the same as the diameter of the stator magnet 52.

[0040] The through hole C721 has an inner surface F721. The center of the through hole C721 when viewed in the first direction coincides with the center of the spacer 72. The through hole C721 corresponds to the "through hole for the second stator magnet".

[0041] The recess C722 is recessed from one main surface and is circular when viewed in a direction (first direction) orthogonal to the one main surface. The diameter of the recess C722 is larger than the diameter of the through hole C721 and is substantially the same as the diameter of the outer shape (the diameter of the circle formed by the outer surface SO31) of the end portion (thin and thick portion) near the second end face E32 of the cylindrical holder 30.

[0042] The recess C722 has an inner surface F722 and a bottom surface B722. The center of the recess C722 when viewed in the first direction coincides with the centers of the spacer 72 and the through hole C721.

[0043] As a result, the through hole C721 has a shape that penetrates the bottom surface B722 of the recess C722 and the other main surface of the spacer 72, and the spacer 72 has a stepped portion. At this time, the height of the through hole C721 is lower than the height of the stator magnet 52.

[0044] The terminal pin 81 is disposed on the spacer 71. The terminal pin 81 is a rod-shaped body made of a conductive material such as metal. The terminal pin 81 is disposed at the thickest portion of the spacer 71. The thickest portion is the portion of the spacer 71 where the recess C712 is not formed. The terminal pin 81 is disposed so as to extend in a direction orthogonal to one main surface and the other main surface and protrudes from one main surface and the other main surface.

[0045] Terminal pins 81 and 82 protrude from the opening OP241 of the first lid member 221 to the outside of the cylindrical case 20 (see, for example, FIG. 2). The drive winding 61 is connected to the terminal pin 81, and the drive winding 62 is connected to the terminal pin 82 (see, for example, FIG. 2).

[0046] (Fixing mode of each component of the vibration motor 10) FIGS. 3(A), 3(B), and 3(C) are plan views viewed in a first direction for explaining the fixing structure of the vibration motor according to the first embodiment. FIG. 3(A) shows the positional relationship between the lid member and the spacer, FIG. 3(B) shows the positional relationship between the lid member, the spacer, and the stator magnet, and FIG. 3(C) shows the positional relationship between the lid member, the spacer, the stator magnet, and the cylindrical holder. In FIGS. 3(A), 3(B), and 3(C), the side of the first lid member 221 is taken as an example, but the side of the second lid member 222 also has the same configuration.

[0047] As shown in FIGS. 2 and 3(A), the spacer 71 is disposed on the surface of the first lid member 221 on the side connected to the main body 21. When viewed in the first direction, the center of the spacer 71 coincides with the center of the first lid member 221. The outer surface F710 of the spacer 71 abuts against the inner surface of the main body 21. Thereby, the spacer 71 is positioned with respect to the cylindrical case 20.

[0048] As shown in FIGS. 2 and 3(B), the stator magnet 51 is disposed by being inserted through the through hole C711 of the spacer 71. The inner surface F711 of the through hole C711 of the spacer 71 abuts against the outer surface of the stator magnet 51. Thereby, the stator magnet 51 is positioned with respect to the spacer 71.

[0049] At this time, in the configuration in which the N-pole surface N40 of the rotor magnet 40 faces the first end face E31 side as described above, the stator magnet 51 is disposed such that the S-pole surface S51 faces the first lid member 221 side. Thereby, in a state where the cylindrical holder 30 is disposed on the spacer 71 shown below, the N-pole surface N51 of the stator magnet 51 and the N-pole surface N40 of the rotor magnet 40 face each other.

[0050] Furthermore, the stator magnet 51 is adjacent to the first lid member 221. As a result, the stator magnet 51 is attracted to the first lid member 221 by the magnetic force of the stator magnet 51, and the stator magnet 51 is fixed to the first lid member 221.

[0051] As shown in FIGS. 2 and 3(C), in the cylindrical holder 30 in which the mover magnet 40 is accommodated, the end portion of the first end surface E31 of the main body portion 31 is accommodated in the recess C712.

[0052] The first end surface E31 of the main body portion 31 abuts against the bottom surface B712 of the recess C712. The outer surface SO31 of the main body portion 31 abuts against the inner surface F712 of the recess C712. Further, the inner surface SI30 of the main body portion 31 abuts against the outer surface of the stator magnet 51. As a result, the end portion (thick-thin portion) on the first end surface E31 side of the cylindrical holder 30 is sandwiched between the inner surface F712 of the recess 712 and the outer surface of the stator magnet 51.

[0053] With these configurations, the stator magnet 51 is fixed to the cylindrical case 20 such that at least a part of the stator magnet 51 is accommodated in the cylindrical holder 30 by using the stepped portion of the spacer 71.

[0054] Also, the strength of the end portion (thick-thin portion) on the first end surface E31 side of the cylindrical holder 30 is reinforced by a sandwiching structure by the inner surface F712 of the recess 712 and the outer surface of the stator magnet 51. As a result, the strength of the end portion (thick-thin portion) on the first end surface E31 side of the cylindrical holder 30 is ensured.

[0055] Referring to FIGS. 2 and 3(A), the spacer 72 is disposed on the surface of the second lid member 222 on the side connected to the main body portion 21. When viewed in the first direction, the center of the spacer 72 coincides with the center of the second lid member 222. The outer surface F720 of the spacer 72 abuts against the inner surface of the main body portion 21. As a result, the spacer 72 is positioned with respect to the cylindrical case 20.

[0056] Referring to FIGS. 2 and 3(B), the stator magnet 52 is inserted and disposed in the through hole C721 of the spacer 72. The inner surface F721 of the through hole C721 of the spacer 72 abuts against the outer surface of the stator magnet 52. Thereby, the stator magnet 52 is positioned with respect to the spacer 72.

[0057] At this time, in the configuration where the S-pole surface S40 of the mover magnet 40 faces the second end face E32 side as described above, the stator magnet 52 is arranged such that the N-pole surface N51 faces the second lid member 222 side. Thereby, with the cylindrical holder 30 disposed on the spacer 72 as shown below, the S-pole surface S51 of the stator magnet 52 and the S-pole surface S40 of the mover magnet 40 face each other.

[0058] Furthermore, the stator magnet 52 is adjacent to the second lid member 222. Thereby, the stator magnet 52 is attracted to the second lid member 222 by the magnetic force of the stator magnet 52, and the stator magnet 52 is fixed to the second lid member 222.

[0059] Referring to FIGS. 2 and 3(C), in the cylindrical holder 30 in which the mover magnet 40 is accommodated, the end portion of the second end face E32 of the main body portion 31 is accommodated in the recess C722.

[0060] The second end face E32 of the main body portion 31 abuts against the bottom surface B722 of the recess C722. The outer surface SO31 of the main body portion 31 abuts against the inner surface F722 of the recess C722. Furthermore, the inner surface SI30 of the main body portion 31 abuts against the outer surface of the stator magnet 52. Thereby, the end portion (thick and thin portion) on the second end face E32 side of the cylindrical holder 30 is sandwiched between the inner surface F722 of the recess 722 and the outer surface of the stator magnet 52.

[0061] With these configurations, the stator magnet 52 is fixed to the cylindrical case 20 such that at least a part of the stator magnet 52 is accommodated in the cylindrical holder 30 by using the step portion of the spacer 72.

[0062] In addition, the strength of the end portion (thick-thin portion) on the second end face E32 side of the cylindrical holder 30 is reinforced by a sandwiching structure formed by the inner surface F722 of the concave portion 722 and the outer surface of the stator magnet 52. As a result, the strength of the end portion (thick-thin portion) on the second end face E32 side of the cylindrical holder 30 is ensured.

[0063] With the above configuration, the vibration motor 10 can reduce the distance between the plurality of drive windings 61 and 62 and the rotor magnet 40 by making the both sides (both end portions) of the flange portion 32 of the cylindrical holder 30 thick and thin.

[0064] Furthermore, the stator magnet 51 and the stator magnet 52 are arranged at one end and the other end of the cylindrical holder 30 with the rotor magnet 40 sandwiched therebetween so as to generate magnetic forces that repel the rotor magnet 40 in the first direction which is the movable direction of the rotor magnet 40. Therefore, the vibration motor 10 constitutes a magnetic spring type actuator. Then, the rotor magnet 40 slides so as to reach the thick-thin portion of the cylindrical holder 30 in the first direction in which the first end face E31 and the second end face E32 of the cylindrical holder 30 are aligned.

[0065] However, by having the above-described configuration, in the vibration motor 10, the strength of the thick-thin portion of the cylindrical holder 30 is reinforced. As a result, the cylindrical holder 30 is less likely to be deformed even when there is sliding along the first direction of the rotor magnet 40.

[0066] In this way, the vibration motor 10 can suppress deterioration of the characteristics as a vibration motor, suppress noise, while suppressing an increase in size of the shape.

[0067] The vibration motor 10 having such a configuration is manufactured, for example, as follows.

[0068] First, the spacer 72 is disposed on the second lid member 222 of the cylindrical case 20.

[0069] Next, the stator magnet 52 is disposed in the through hole C721 of the spacer 72. Thereby, an integrated structure of the second lid member 222, the spacer 72, and the stator magnet 52 is formed.

[0070] Next, the mover magnet 40 is accommodated in the through hole 300 of the cylindrical holder 30, and the end portion on the second end face E32 side of the cylindrical holder 30 is inserted into the concave portion C722 of the spacer 72.

[0071] Next, the main body portion 21 of the cylindrical case 20 is arranged with respect to the integrated structure of the second lid member 222, the spacer 72, and the stator magnet 52, and the main body portion 21 and the second lid member 222 are fixed.

[0072] Next, an integrated structure of the first lid member 221, the stator magnet 51, the spacer 71, and the terminal pins 81 and 82 is formed, and the drive windings 61 and 62 are respectively connected to the terminal pins 81 and 82.

[0073] Next, the integrated structure of the first lid member 221, the stator magnet 51, the spacer 71, and the terminal pins 81 and 82 is arranged in the main body portion 21 of the cylindrical case 20, and the main body portion 21 and the first lid member 221 are fixed.

[0074] In such a manufacturing method, the spacer 71, the stator magnet 51, the cylindrical holder 30, and the cylindrical case 20 (the main body portion 21 and the first lid member 221) are in contact with each other. The spacer 72, the stator magnet 52, the cylindrical holder 30, and the cylindrical case 20 (the main body portion 21 and the second lid member 222) are in contact with each other.

[0075] Thereby, it can be easily assembled while accurately maintaining the positional relationship of the components constituting the vibration motor 10.

[0076] [Second Embodiment] The vibration motor according to the second embodiment of the present invention will be described with reference to the drawings. FIG. 4 is an exploded perspective view of the vibration motor according to the second embodiment. FIG. 5 is a side cross-sectional view of the vibration motor according to the second embodiment. FIGS. 6(A), 6(B), and 6(C) are plan views seen in the first direction for explaining the fixing structure of the vibration motor according to the second embodiment.

[0077] As shown in FIGS. 4, 5, 6(A), 6(B), and 6(C), the vibration motor 10A according to the second embodiment differs from the vibration motor 10 according to the first embodiment in that the cylindrical holder 30 is provided with fitting recesses C311 and C312, the configuration of the spacer 71A, and the configuration of the spacer 72A. Other configurations of the vibration motor 10A according to the second embodiment are the same as those of the vibration motor 10 according to the first embodiment, and descriptions of the same parts are omitted.

[0078] The cylindrical holder 30 includes a plurality of fitting recesses C311 that are recessed in the first direction from the first end surface E31. The plurality of fitting recesses C311 are formed at equal intervals in the extending direction of the ring forming the first end surface E31.

[0079] The cylindrical holder 30 includes a plurality of fitting recesses C312 that are recessed in the first direction from the second end surface E32. The plurality of fitting recesses C312 are formed at equal intervals in the extending direction of the ring forming the second end surface E32.

[0080] The spacer 71A differs from the spacer 71 in that it includes a plurality of convex portions 713. Other configurations of the spacer 71A are the same as those of the spacer 71, and descriptions of the same parts are omitted.

[0081] The spacer 71A includes a plurality of convex portions 713. The plurality of convex portions 713 are formed at substantially equal angular intervals with the center of the spacer 71A viewed in the first direction as a reference point.

[0082] The plurality of convex portions 713 project toward the center of the spacer 71A on the central side (viewed in the first direction) of the spacer 71A in a plan view at the step portion. More specifically, the plurality of convex portions 713 are shaped to project from the inner surface F712 of the recess C712 toward the center of the spacer 71A. The tips of the plurality of convex portions 713 are flush with the inner surface F711 forming the through hole C711.

[0083] The spacer 72A differs from the spacer 72 in that it includes a plurality of convex portions 723. Other configurations of the spacer 72A are the same as those of the spacer 72, and descriptions of the same parts are omitted.

[0084] The spacer 72A includes a plurality of convex portions 723. The plurality of convex portions 723 are formed at substantially equal angular intervals with reference to the center when the spacer 72A is viewed in the first direction.

[0085] The plurality of convex portions 723 project toward the center side (when viewed in the first direction) in a plan view of the spacer 72A at the step portion. More specifically, the plurality of convex portions 723 are shaped to project from the inner surface F722 of the concave portion C722 toward the center of the spacer 72A. The tips of the plurality of convex portions 723 are flush with the inner surface F721 that forms the through hole C721.

[0086] The cylindrical holder 30 is arranged such that the first end face E31 abuts against the bottom face B712 of the concave portion C712 of the spacer 71A, and the plurality of fitting concave portions C311 fit onto the plurality of convex portions 713. Further, the cylindrical holder 30 is arranged such that the second end face E32 abuts against the bottom face B722 of the concave portion C722 of the spacer 72A, and the plurality of fitting concave portions C312 fit onto the plurality of convex portions 723.

[0087] With such a configuration, the vibration motor 10A exhibits the same operational effects as the vibration motor 10.

[0088] Furthermore, the rotation of the cylindrical holder 30 can be prevented when the plurality of fitting concave portions C311 of the cylindrical holder 30 fit onto the plurality of convex portions 713 and the plurality of fitting concave portions C312 fit onto the plurality of convex portions 723.

[0089] In this embodiment, the number of the plurality of convex portions 713 and the number of the plurality of convex portions 723 are four, but the number is not limited to this.

[0090] <1> One mover magnet, A cylindrical holder having a through hole with both ends open, the mover magnet being housed in the through hole and having a flange portion at the central portion of the outer surface, Drive windings wound around both sides of the cylindrical holder across the flange portion on the outer periphery of the cylindrical holder, In a first direction which is the moving direction of the mover magnet, a first stator magnet disposed at one end of the cylindrical holder and a second stator magnet disposed at the other end of the cylindrical holder sandwiching the mover magnet so as to generate magnetic forces that repel the mover magnet respectively. A first spacer and a second spacer having insulation. A cylindrical case that houses the cylindrical holder, the drive winding, the first stator magnet, the second stator magnet, the first spacer, and the second spacer. Terminal pins connected to the drive winding. Comprising The cylindrical case is made of a metal material. A main body portion with both ends in the extending direction being open. A first lid member disposed at one end of the main body portion in the extending direction. A second lid member disposed at the other end of the main body portion in the extending direction. Comprising The first spacer is disposed at one end of the main body portion. The second spacer is disposed at the other end of the main body portion. The first spacer and the second spacer have a stepped portion that forms an inner surface that houses the end of the cylindrical holder and abuts against the outer surface of the end of the cylindrical holder. At least one of the first spacer and the second spacer has the terminal pin passing through it. The first stator magnet is fixed to the cylindrical case so that at least a part of it is housed in the cylindrical holder by using the stepped portion of the first spacer. The second stator magnet is fixed to the cylindrical case so that at least a part of it is housed in the cylindrical holder by using the stepped portion of the second spacer, a vibration motor.

[0091] <2> When viewed in the first direction, The first spacer includes a through hole for the first stator magnet into which the first stator magnet is inserted, at a position more central than the stepped portion. The vibration motor according to <1>, wherein the second spacer includes a through-hole for the second stator magnet into which the second stator magnet is inserted, at a position more central than the stepped portion.

[0092] <3> The cylindrical case includes a plurality of fitting recesses at both ends thereof. The stepped portion includes a plurality of convex portions protruding toward the central side. The vibration motor according to <1> or <2>, wherein the cylindrical case is disposed on the first spacer and the second spacer such that the plurality of fitting recesses are respectively fitted to the plurality of convex portions.

Explanation of Signs

[0093] 10, 10A: Vibration motor 20: Cylindrical case 21: Main body portion 30: Cylindrical holder 31: Main body portion 32: Flange portion 40: Rotor magnet 51, 52: Stator magnets 61, 62: Driving windings 71, 71A, 72, 72A: Spacers 81, 82: Terminal pins 210: Through-hole 221: First lid member 222: Second lid member 300: Through-hole 713, 723: Convex portions B712, B722: Bottom surfaces C311, C312: Fitting recesses C711, C721: Through-holes C712, C722: Recesses E31: First end face E32: Second end face F710, F720: Outer surfaces F711, F712, F721, F722: Inner surfaces N40, N51, N52: N-pole faces OP241: Opening S40, S51, S52: S-pole faces SI30: Inner surface SO31: Outer surface

Claims

1. One movable magnet, a cylindrical holder having a through hole with both ends open, the movable magnet being housed in the through hole and having a flange portion at the center of the outer surface, drive windings wound around both sides of the cylindrical holder on the outer periphery with the flange portion interposed therebetween, a first stator magnet disposed at one end of the cylindrical holder with the movable magnet interposed therebetween so as to generate a magnetic force that repels the movable magnet in a first direction which is the movable direction of the movable magnet, and a second stator magnet disposed at the other end, a first spacer and a second spacer having insulating properties, a cylindrical case housing the cylindrical holder, the drive windings, the first stator magnet, the second stator magnet, the first spacer, and the second spacer, terminal pins connected to the drive windings, and comprising: the cylindrical case is made of a metallic material, a main body portion with both ends in the extending direction open, a first lid member disposed at one end of the main body portion in the extending direction, a second lid member disposed at the other end of the main body portion in the extending direction, and comprising: the first spacer is disposed at one end of the main body portion, the second spacer is disposed at the other end of the main body portion, the first spacer and the second spacer have a stepped portion that forms an inner surface that houses an end portion of the cylindrical holder and abuts against an outer surface of the end portion of the cylindrical holder, at least one of the first spacer and the second spacer has the terminal pin passing therethrough, the first stator magnet is fixed to the cylindrical case such that at least a part thereof is housed in the cylindrical holder by using the stepped portion of the first spacer, the second stator magnet is fixed to the cylindrical case such that at least a part thereof is housed in the cylindrical holder by using the stepped portion of the second spacer, a vibration motor.

2. When viewed in the first direction, the first spacer includes a through hole for the first stator magnet into which the first stator magnet is inserted, at a position more central than the stepped portion, the second spacer includes a through hole for the second stator magnet into which the second stator magnet is inserted, at a position more central than the stepped portion, The vibration motor according to Claim 1.

3. the cylindrical case has a plurality of fitting recesses at both ends thereof, the stepped portion has a plurality of convex portions protruding toward the center side, The cylindrical case is disposed on the first spacer and the second spacer such that the plurality of fitting recesses are respectively fitted to the plurality of protrusions. The vibration motor according to claim 1.

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