Vibration motor

Abstract

To provide a vibration motor which enables a movable element to stably operate.SOLUTION: A vibration motor 10 has: a stationary part 1; and a movable element 2 which has a magnet 21 and may vibrate in a first direction. The stationary part 1 has: a coil 14 which may apply drive force to the magnet 21 by energization; a housing 11 which houses the movable element 2 and the coil 14; and a first bearing part 122 disposed in the housing 11. The first bearing part 122 has a first bearing inner surface which is disposed facing a radial outer surface of the movable element 2 in a radial direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a vibration motor. [Background technology]

[0002] Conventionally, various devices such as mobile devices such as smartphones are equipped with vibration motors as vibration generating devices. Vibration motors are used for purposes such as notifying users of incoming calls or alarms, or providing haptic feedback in human interfaces.

[0003] The vibration motor includes a housing, a coil, an elastic member, and a mover. The mover includes a magnet. The mover and the housing are connected by an elastic member. The mover vibrates when a magnetic field is generated by passing electricity through the coil (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-19011 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, when the housing is made of a magnetic material, the movable element may be attracted to the inner surface of the housing by an attractive force and may become stuck to the inner surface of the housing, causing the movable element to become stuck. The housing is made of a magnetic material in order to form a magnetic circuit and increase the magnetic force.

[0006] In view of the above circumstances, an object of the present invention is to provide a vibration motor that operates a mover stably. [Means for solving the problem]

[0007] An exemplary vibration motor of the present invention includes a stationary part and a movable part having a magnet and capable of vibrating in a first direction. The stationary part includes a coil capable of applying a driving force to the magnet when energized, a housing that accommodates the movable part and the coil therein, and a first bearing part disposed inside the housing. The first bearing part has a first bearing inner surface disposed radially opposite to a radial outer surface of the movable part. Effect of the Invention

[0008] According to the exemplary vibration motor of the present invention, the mover can be operated stably. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a cross-sectional perspective view of a vibration motor according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a side cross-sectional view of the vibration motor shown in FIG. [Diagram 3] FIG. 3 is a side cross-sectional view of a vibration motor according to a first modified example. [Figure 4] FIG. 4 is a front view of a part of the first bearing portion as viewed from the other side in the first direction. [Diagram 5] FIG. 5 is a diagram showing a schematic view of how air escapes in the first modified example. [Figure 6] FIG. 6 is a diagram showing a state in which the mover in the first modified example has moved to a position beyond the groove. [Figure 7] FIG. 7 is a side cross-sectional view of a vibration motor according to a second modified example. [Figure 8] FIG. 8 is a side cross-sectional view of a vibration motor according to a fourth modified example. [Figure 9] FIG. 9 is a diagram showing a schematic view of the escape of air in the fourth modified example. [Figure 10] FIG. 10 is a diagram showing a state in which the mover in the fourth modified example has moved to a position beyond the air hole. [Figure 11] FIG. 11 is a side cross-sectional view of a vibration motor according to a fifth modified example. [Figure 12] FIG. 12 is a side cross-sectional view of a vibration motor according to a sixth modified example. [Figure 13] FIG. 13 is a side cross-sectional view of a vibration motor according to a seventh modified example. [Figure 14] FIG. 14 is a cross-sectional perspective view of a vibration motor according to the second embodiment of the present invention. [Figure 15] FIG. 15 is a vertical sectional perspective view of a vibration motor according to a third embodiment of the present invention. [Figure 16] FIG. 16 is a vertical sectional view of a vibration motor according to a third embodiment of the present invention. [Figure 17] FIG. 17 is a perspective view showing a configuration relating to electrical connection between the substrate and the coil. [Figure 18] FIG. 18 is a vertical cross-sectional view showing a partial configuration of a bearing portion according to a modified example. [Figure 19] FIG. 19 is a perspective view showing one end portion in the first direction of a bearing portion according to another modified example. [Figure 20] FIG. 20 is a perspective view showing a modified example of the holder. [Figure 21] FIG. 21 is a diagram showing a schematic diagram of a touch pen equipped with a vibration motor. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Exemplary embodiments of the present invention will now be described with reference to the drawings.

[0011] In the drawings, the first direction in which the mover vibrates is the X direction, one side of the first direction is indicated as X1, and the other side of the first direction is indicated as X2. The central axis J of the vibration motor (FIG. 2, etc.) extends in the first direction. The direction perpendicular to the central axis J is referred to as the "radial direction."

[0012] <1. First embodiment> First, a first embodiment of the present invention will be described. Fig. 1 is a cross-sectional perspective view of a vibration motor 10 according to the first embodiment of the present invention. Fig. 2 is a side cross-sectional view of the vibration motor 10 shown in Fig. 1.

[0013] The vibration motor 10 includes a stationary part 1 and a mover 2. The mover 2 is capable of vibrating in a first direction (X direction). The vibration motor 10 further includes an elastic member 3.

[0014] The stationary part 1 has a housing 11, a first sleeve bearing 12, and a coil 14. The housing 11 is a cylindrical member extending in a first direction. The housing 11 is not limited to a cylindrical shape, and may be, for example, a rectangular tube shape. The housing 11 is made of a magnetic material. The magnetic material is, for example, stainless steel.

[0015] The first sleeve bearing 12 has a first cover portion 121 and a first bearing portion 122. That is, the stationary portion 1 has the first cover portion 121 and the first bearing portion 122. The first cover portion 121 is substantially disk-shaped. The stationary portion 1 has the first cover portion 121 arranged on one side in the first direction from the movable member 2 and extending in a direction intersecting the first direction. The first bearing portion 122 is substantially cylindrical and protrudes from the first cover portion 121 to the other side in the first direction and extends in the first direction. The first cover portion 121 is not limited to being substantially disk-shaped, and may be, for example, substantially square plate-shaped, and the first bearing portion 122 is not limited to being substantially cylindrical, and may be, for example, substantially square tube-shaped. The first cover portion 121 and the first bearing portion 122 configure the first sleeve bearing 12, which is a single member. The first cover portion 121 and the first bearing portion 122 may be separate bodies. In that case, the first lid portion 121 and the housing 11 may form a single member.

[0016] The first sleeve bearing 12 is inserted into the housing 11 from one side in the first direction of the housing 11 and fixed to the housing 11. The first cover part 121 closes the end part on one side in the first direction of the housing 11. The first bearing part 122 is disposed inside the housing 11 on the other side in the first direction of the first cover part 121. That is, the stationary part 1 has the first bearing part 122 disposed inside the housing 11.

[0017] The first sleeve bearing 12 is made of, for example, a resin with a low friction coefficient and low wear properties. An example of the resin is POM (polyacetal).

[0018] The stationary part 1 has a second lid part 13. The second lid part 13 is generally disk-shaped and closes the other end of the housing 11 in the first direction. The second lid part 13 is not limited to being generally disk-shaped, and may be, for example, generally rectangular plate-shaped. The housing 11, the first lid part 121, and the second lid part 13 form a housing. The stationary part 1 has the second lid part 13, which is disposed on the other side in the first direction relative to the mover 2, and which extends in a direction intersecting the first direction.

[0019] The coil 14 is fixed to the radially inner surface of the housing 11. More specifically, the coil 14 is formed by winding a conductor around a central axis J extending in the first direction of the mover 2, and is fixed to the radially inner surface of the housing 11. That is, the housing 11 accommodates the coil 14 inside. This improves the coaxiality between the mover 2 and the coil 14. In particular, when the housing 11 is made of a magnetic material, the magnetic efficiency of the coil 14 can be improved. The coil 14 generates a magnetic field when electricity is applied. The stationary part 1 has the coil 14 that can apply a driving force to a magnet 21 (described later) when electricity is applied. The coil 14 is fixed to the end surface of the first bearing part 122 on the other side in the first direction. This allows the coil 14 to be positioned with high precision. In this embodiment, the coil 14 and the mover 2 are arranged substantially coaxially.

[0020] The mover 2 has a magnet 21. The mover 2 further has a magnetic body 22 and a holder 23. The mover 2 is accommodated inside the housing 11. That is, the stationary part 1 has the housing 11 that accommodates the mover 2 and the coil 14 inside. The magnet 21 has a magnet part 21A on one side in the first direction and a magnet part 21B on the other side in the first direction. The magnetic body 22 is sandwiched between the magnet parts 21A and 21B from both sides in the first direction. The magnet parts 21A and 21B and the magnetic body 22 are substantially cylindrical and extend in the first direction. Note that the magnet parts 21A and 21B and the magnetic body 22 are not limited to being substantially cylindrical, and may be, for example, substantially rectangular prism-shaped.

[0021] The other side of the magnet part 21A in the first direction is an N pole, and one side in the first direction is an S pole. The one side of the magnet part 21B in the first direction is an N pole, and the other side in the first direction is an S pole. That is, the N poles face each other in the first direction with the magnetic body 22 in between. By forming the housing 11 from a magnetic body, it is possible to suppress leakage of the magnetic field generated by the magnet 21 and the coil 14 to the outside of the vibration motor 10, and to increase the magnetic force. Note that the S poles may face each other in the first direction with the magnetic body 22 in between.

[0022] The holder 23 holds the other side portion of the magnet part 21B (magnet 21) in the first direction. The holder 23 has a columnar recess 23A that is cylindrically recessed toward the other side in the first direction. The other side portion of the magnet part 21B in the first direction is fitted into the columnar recess 23A. The other side portion of the magnet part 21B in the first direction is fixed to the radially inner surface of the columnar recess 23A by, for example, an adhesive. The holder 23 functions as a weight and is made of, for example, a tungsten alloy. The magnet 21 is disposed on one side in the first direction of the holder 23 and fixed to the holder 23.

[0023] The other side surface 14A in the first direction of the coil 14 is disposed opposite in the first direction to the one side surface 23B in the first direction of the holder 23. This makes it possible to reduce the radial size of the vibration motor 10 compared to a case in which the other side surface 14A in the first direction of the coil 14 is entirely disposed radially outward from the one side surface 23B in the first direction of the holder 23.

[0024] The elastic member 3 is a coil spring wound around the central axis J. The end of the elastic member 3 on one side in the first direction is fixed to the end surface on the other side in the first direction of the holder 23, and the end of the elastic member 3 on the other side in the first direction is fixed to the inner surface of the second cover portion 13. The mover 2 has the holder 23 to which the elastic member 3 is fixed. The elastic member 3 is fixed, for example, by adhesion. Since the elastic member 3 is fixed to the holder 23, the elastic member 3 can be easily fixed to the mover 2. That is, the elastic member 3 is disposed between the holder 23 and the second cover portion 13. The vibration motor 10 has the elastic member 3 that connects the mover 2 and the second cover portion 13 and has elasticity. By fixing the mover 2 to the second cover portion 13 via the elastic member 3, the vibration of the mover 2 is stabilized. Note that the fixing of the elastic member 3 is not limited to adhesion, and may be performed, for example, by welding, fitting, caulking, or the like.

[0025] The first bearing portion 122 has a cylindrical first bearing inner surface 122A. In a non-operating state in which the coil 14 is not energized and the mover 2 is stationary, a portion of the magnet portion 21A on one side in the first direction is accommodated inside the first bearing portion 122 with a gap S1 from the first bearing inner surface 122A. That is, the first bearing portion 122 has the first bearing inner surface 122A that is disposed with a gap S1 from the outer surface of the first direction one side portion P1 of the mover 2. The first bearing portion 122 has the first bearing inner surface 122A that is disposed radially opposite the radial outer surface of the mover 2. Note that FIG. 1 and FIG. 2 show the vibration motor 10 in a non-operating state.

[0026] In the non-operating state, the magnetic body 22 is located inside the coil 14. In addition, in the non-operating state, the elastic member 3 has a natural length, but it is easy to fix the elastic member 3 to the mover 2 by the holder 23.

[0027] When a current is applied to the coil 14, a driving force is applied to the magnet 21 due to an interaction between the magnetic field generated by the coil 14 and the magnetic field of the magnet 21. In other words, when a driving force is applied to the mover 2, the mover 2 vibrates in the first direction.

[0028] When the mover 2 vibrates and comes into contact with the first bearing inner surface 122A of the first bearing portion 122, the mover 2 slides against the stationary first bearing portion 122, so the movement of the mover 2 is limited to the movement in the first direction. This allows the mover 2 to operate stably. When the housing 11 is made of a magnetic material, the mover 2 drives along the first bearing inner surface 122A, so it is possible to prevent the mover 2 from being attracted by an attractive force to the housing 11 made of a magnetic material and sticking thereto.

[0029] Furthermore, when the mover 2 moves to one side in the first direction, the mover 2 pushes in the air contained in the space surrounded by the first bearing portion 122 and the first cover portion 121, thereby exerting a damper effect. This makes it possible to appropriately maintain the distance between the mover 2 and the first cover portion 121 in the first direction.

[0030] In addition, if a vibration motor is configured to have two elastic members by disposing the elastic members on one side and the other side in the first direction, there is a risk that the characteristics of the elastic members will not match, making it difficult to stabilize product performance such as resonance frequency. In contrast, in the configuration of this embodiment, there is only one elastic member 3, so product performance can be stabilized. In addition, compared to a configuration in which a holder and an elastic member are provided on one side in the first direction when two elastic members are provided as described above, in the configuration of this embodiment, the holder and the elastic member can be replaced with the first bearing portion 122, so costs can be reduced.

[0031] <2. First modified example> Various modified examples of the first embodiment described above will be described below. Note that the various modified examples described below can be implemented in appropriate combinations.

[0032] Fig. 3 is a side cross-sectional view of a vibration motor 101 according to a first modified example. As shown in Fig. 3, in the first modified example, a groove 1221 is provided in the first bearing portion 122. The groove 1221 is provided in the first bearing inner side surface 122A. The groove 1221 extends along the first direction. The groove 1221 is included in the gap S1.

[0033] Fig. 4 is a front view of a part of first bearing portion 122 viewed from the other side in the first direction. As shown in Fig. 4, a plurality of groove portions 1221 are provided. Note that the number of groove portions 1221 may be one. That is, first bearing inner surface 122A has at least one groove portion 1221 extending along the first direction.

[0034] The first direction other side end 1221A of the groove portion 1221 opens at the first direction other side end 122B of the first bearing portion 122. In other words, the first direction other side end 1221A of the groove portion 1221 is disposed at the first direction other side end 122B of the first bearing portion 122.

[0035] Further, one end 1221B of the groove 1221 on one side in the first direction is located on the other side in the first direction relative to one end 122C of the first bearing 122 on one side in the first direction.

[0036] In such a first modified example, as shown in Fig. 5, when the mover 2 (magnet portion 21A) moves to one side in the first direction in an operating state, air pushed in by the mover 2 escapes into the groove portion 1221. Note that Fig. 5 shows an air flow F1. This weakens the damping effect, and the sliding property of the mover 2 can be improved.

[0037] Moreover, the air that has escaped into the groove portion 1221 flows out from the other side end 1221A in the first direction to the outside, so that the air can escape more easily and the slidability of the mover 2 can be further improved.

[0038] 6, when the mover 2 moves in the first direction and passes the first direction one side end 1221B to the first direction one side, the escape of air is restricted and the resistance by the air increases. Therefore, the mover 2 can be restricted from contacting the first cover portion 121.

[0039] <3. Second Modification> 7 is a side cross-sectional view of a vibration motor 102 according to a second modified example. The stationary part 1 of the vibration motor 102 has a first buffer member 41 and a second buffer member 42. The buffer members 41 and 42 are made of, for example, silicone rubber, thermoplastic polyurethane, or the like.

[0040] The first buffer member 41 is fixed to an inner surface of the first lid portion 121 facing in the first direction to an end face T1 on one side in the first direction of the mover 2 (magnet portion 21A). The stationary portion 1 has the first buffer member 41 disposed between the first lid portion 121 and the mover 2 in the first direction. The second buffer member 42 is fixed to an inner surface of the second lid portion 13 facing in the first direction to an end face T2 on the other side in the first direction of the mover 2 (holder 23). The stationary portion 1 has the second buffer member 42 disposed between the second lid portion 13 and the mover 2 in the first direction. The buffer members 41, 42 are fixed by, for example, double-sided tape.

[0041] It is also possible to provide only one of the buffer members 41 and 42. That is, the stationary part 1 has the buffer members 41 and 42 arranged on at least one of an inner surface of the first cover part 121 facing the first direction to the end face T1 on one side in the first direction of the mover 2 and an inner surface of the second cover part 13 facing the first direction to the end face T2 on the other side in the first direction of the mover 2.

[0042] During normal operation, the mover 2 does not come into contact with the buffer members 41 and 42. However, if the vibration motor 102 is dropped, for example, the end face T1 on one side in the first direction of the mover 2 comes into contact with the buffer member 41, or the end face T2 on the other side in the first direction of the mover 2 comes into contact with the buffer member 42. Therefore, noise and the like caused by contact between the mover 2 and the stationary part 1 can be suppressed.

[0043] <4.Third Modification> As a third modification, in the vibration motor 10 according to the first embodiment, a lubricant or a magnetic fluid may be disposed in the gap S1. That is, a lubricant or a magnetic fluid is disposed between the radially outer surface of the mover 2 and the first bearing inner surface 122A. The lubricant is, for example, oil. When a magnetic fluid is disposed, the magnetic fluid moves together with the magnet portion 21A.

[0044] This allows the mover 2 to move more easily in the first direction. Also, wear on the mover 2 can be suppressed, resulting in a longer life. Furthermore, noise caused by friction between the mover 2 and the first bearing portion 122 can be suppressed, resulting in improved quietness.

[0045] <5. Fourth Modification> Fig. 8 is a side cross-sectional view of a vibration motor 104 according to a fourth modified example. As shown in Fig. 8, in the vibration motor 104, the first bearing portion 122 has an air passage 1222 and an air hole 1223. The air passage 1222 is disposed along the first direction. The air hole 1223 is connected to the air passage 1222 and disposed in the first bearing inner surface 122A.

[0046] 8 does not extend to the end face of the first bearing part 122 on the other side in the first direction. As in an embodiment described later, the air passage may extend and open to the end face of the first bearing part 122 on the other side in the first direction. The air passage may also extend to the one side in the first direction beyond the air hole 1223. In that case, the air passage may extend and open to the end face of the first cover part 121 on the one side in the first direction.

[0047] According to the configuration shown in Fig. 8, when the mover 2 moves in the first direction, if the mover 2 is located on the other side of the air hole 1223 in the first direction, the air pushed in by the mover 2 flows into the air passage 1222 via the air hole 1223, and the mover 2 is likely to move to one side in the first direction, as shown in Fig. 9. Note that Fig. 9 shows an air flow F2. Then, as shown in Fig. 10, when the mover 2 passes the air hole 1223 to one side in the first direction, the air hole 1223 is blocked, preventing the air from escaping, and the resistance by the air increases. Therefore, the distance in the first direction between the mover 2 and the first cover portion 121 can be appropriately maintained.

[0048] The number of sets of air passages and air holes is not limited to one, and a plurality of sets may be provided lined up in the circumferential direction of the first bearing portion 122.

[0049] <6. Fifth Modification> FIG. 11 is a side cross-sectional view of a vibration motor 105 according to a fifth modified example. As shown in FIG. 11, in the vibration motor 105, a first sliding member 24 is formed to cover the outer circumferential surface of the magnet part 21A. That is, the first direction one side part P1 of the mover 2 has a part 211 of the magnet 21 (magnet part 21A) and a first sliding member 24 arranged on the outer circumferential surface of the part 211. The mover 2 has the first sliding member 24 arranged radially outward of the magnet 21. The radial outer side surface of the first sliding member 24 faces the first bearing inner side surface 122A in the radial direction. The first sliding member 24 is composed of a material with a low friction coefficient, for example, a fluorine layer. The magnet part 21A may be a cylindrical member or a rectangular prism-shaped member. It is sufficient that the first sliding member 24 is formed on the radial outer side surface of the magnet part 21A.

[0050] With this configuration, wear of the magnet 21 caused by the sliding action of the mover 2 in contact with the first bearing inner surface 122A can be suppressed, and magnetic flux change due to wear can be suppressed. In addition, it is possible to suppress movement caused by movement in directions other than the first direction of the other side portion of the mover 2 in the first direction, which occurs due to wear of the mover 2. Therefore, the coaxiality of the mover 2 can be improved. Note that coaxiality refers to the deviation of an axial line from a specified axial line that should coincide. In this case, the specified axial line is the central axis J.

[0051] <7. Sixth Variation> Fig. 12 is a side cross-sectional view of a vibration motor 106 according to a sixth modified example. As shown in Fig. 12, in the vibration motor 106, the mover 2 has a second sliding member 25. The second sliding member 25 is disposed radially outward of the holder 23 and slides against the radially inner side surface of the housing 11. Like the first sliding member 24, the second sliding member 25 is made of, for example, a fluorine layer.

[0052] According to this configuration, the movement of the part on the other side of the first direction of the mover 2 due to the movement in directions other than the first direction can be suppressed, and the coaxiality of the mover 2 can be improved. In addition, if the second sliding member 25 is not provided and the housing 11 is made of a magnetic material, it is necessary to provide a certain amount of gap between the outer circumferential surface of the holder 23 and the inner surface of the housing 11 in order to suppress the mover 2 from being attracted and stuck to the housing 11 made of a magnetic material by the attractive force. Then, when the vibration motor is made compact, the size of the holder 23 as a weight becomes small. In contrast, in this embodiment, since the second sliding member 25 is provided, even if the outer circumferential surface of the holder 23 is brought close to the inner surface of the housing 11, it is possible to suppress the mover 2 from being attracted and stuck, and the mover 2 can be operated stably. In addition, the size of the holder 23 as a weight can be increased even when the vibration motor 106 is made compact. Therefore, the vibration performance of the vibration motor 106 can be improved. In addition, in the vibration motor 106, a lubricant or a magnetic fluid may be disposed between the second sliding member 25 and the housing 11. That is, a lubricant or a magnetic fluid is disposed between the radially outer surface of the second sliding member 25 and the housing 11. The lubricant is, for example, oil. When a magnetic fluid is disposed, the magnetic fluid moves together with the second sliding member 25.

[0053] <8. Seventh Variation> FIG. 13 is a side cross-sectional view of a vibration motor 107 according to a seventh modified example. As shown in FIG. 13, in the vibration motor 107, the first lid portion 121 is disposed facing the first direction one end face T1 of the mover 2. The first lid portion 121 has a through hole 121A penetrating in the first direction. A plurality of through holes 121A are provided. Note that the number of through holes 121A may be one. That is, the first lid portion 121 has at least one through hole 121A penetrating in the first direction. Furthermore, the through hole 121A is disposed on an inner surface of the first lid portion 121 facing the first direction one end face T1 of the mover 2.

[0054] According to such a configuration, when the mover 2 moves in the first direction, air escapes to the outside through the through-holes 121A, so that the mover 2 moves easily.

[0055] <9. Second embodiment> Next, a second embodiment of the present invention will be described. Fig. 14 is a cross-sectional perspective view of a vibration motor 20 according to a second embodiment of the present invention. The difference between the configuration of the vibration motor 20 and the first embodiment is that the vibration motor 20 has a second sleeve bearing 15.

[0056] The stationary part 1 has a second sleeve bearing 15. The second sleeve bearing 15 has a second cover part 151 and a second bearing part 152. That is, the stationary part 1 has the second cover part 151 and the second bearing part 152.

[0057] The second cover portion 151 is generally disk-shaped. The second bearing portion 152 is generally cylindrical and protrudes from the second cover portion 151 to one side in the first direction and extends in the first direction. The second cover portion 151 and the second bearing portion 152 configure the second sleeve bearing 15 as a single member. Note that various modifications of the configuration of the second sleeve bearing 15 are similar to those of the first sleeve bearing 12 described above.

[0058] The second sleeve bearing 15 is inserted into the housing 11 from the other side in the first direction of the housing 11 and fixed to the housing 11. The second cover portion 151 closes the end portion on the other side in the first direction of the housing 11. The second bearing portion 152 is disposed inside the housing 11 on the other side in the first direction of the first bearing portion 122 and on one side in the first direction of the second cover portion 151. The stationary portion 1 has the second bearing portion 152 disposed inside the housing 11 on the other side in the first direction of the first bearing portion 122.

[0059] The second sleeve bearing 15 is made of, for example, a resin with a low friction coefficient and low wear properties. An example of the resin is POM (polyacetal).

[0060] The second bearing portion 152 has a cylindrical second bearing inner surface 152A. In the non-operating state, a portion of the magnet portion 21B on the other side in the first direction is accommodated inside the second bearing portion 152 with a gap S2 from the second bearing inner surface 152A. That is, the second bearing portion 152 has the second bearing inner surface 152A arranged with the gap S2 from the outer circumferential surface of the first direction other side portion P2 of the movable member 2. The second bearing portion 152 has the second bearing inner surface 152A arranged radially opposite to the radial outer surface of the movable member 2. Note that FIG. 14 shows the vibration motor 20 in the non-operating state.

[0061] By passing current through the coil 14, a driving force is applied to the magnet 21, and the mover 2 vibrates in the first direction. If the mover 2 comes into contact with the bearing inner surfaces 122A, 152A as it vibrates, the mover 2 slides against the stationary first bearing portion 122 and second bearing portion 152, limiting the movement of the mover 2 to movement in the first direction. This stabilizes the movement of the mover 2. Furthermore, if the housing 11 is made of a magnetic material, sticking of the mover 2 is suppressed, and the mover 2 can be operated stably.

[0062] In addition, when the movable member 2 moves to the other side in the first direction, the movable member 2 pushes in the air contained in the space surrounded by the second bearing portion 152 and the second lid portion 151, thereby exerting a damper effect and preventing the movable member 2 from coming into contact with the second lid portion 151.

[0063] Furthermore, in this embodiment, the holder and the elastic member are replaced with the second bearing portion 152, so that costs can be further reduced compared to the first embodiment.

[0064] In the configuration shown in FIG. 14, the first bearing portion 122 has an air passage 1222 and an air hole 1223 , and the second bearing portion 152 has an air passage 1522 and an air hole 1523 .

[0065] Air passage 1222 extends and opens further in the first direction than air hole 1223 to the other end in the first direction of first bearing portion 122. That is, the other end in the first direction 1222A of air passage 1222 is located at the other end in the first direction of first bearing portion 122. Therefore, air passage 1222 communicates with the space on the other side in the first direction of first bearing portion 122.

[0066] As a result, when the movable element 2 moves to one side in the first direction, the air pushed in by the movable element 2 flows into the air passage 1222 via the air hole 1223 and flows out from the other side end 1222A in the first direction to the outside. This makes it easier for the air to escape, and makes it easier for the movable element 2 to move to one side in the first direction.

[0067] The air passage 1222 and the air hole 1223 form a communication part. That is, the first bearing part 122 has a communication part that communicates the internal space of the first bearing part 122 with the external space of the first bearing part 122. The communication part may be configured as a through hole that penetrates the first bearing part 122 in the radial direction. This makes it easier for air to escape from the internal space of the first bearing part 122, stabilizing the movement of the mover 2.

[0068] Air passage 1522 extends and opens to one side in the first direction further than air hole 1523 to one end of second bearing portion 152 in the first direction. That is, one end 1522A of air passage 1522 on one side in the first direction is located at the other end of second bearing portion 152 in the first direction.

[0069] As a result, when the mover 2 moves in the other side in the first direction, the air pushed in by the mover 2 flows into the air passage 1522 via the air hole 1523 and flows out from the one side end 1522A in the first direction to the outside. This makes it easier for the air to escape, and makes it easier for the mover 2 to move in the other side in the first direction. When the mover 2 passes the air hole 1523 to the other side in the first direction, the air hole 1523 is blocked, so the damper effect is strengthened and the distance in the first direction between the mover 2 and the second cover portion 151 can be appropriately maintained.

[0070] It should be noted that various modified examples of the first embodiment described above can be applied to this embodiment as appropriate.

[0071] <10. Third embodiment> <10-1 Overall configuration of vibration motor> 15 is a vertical cross-sectional perspective view of a vibration motor 30 according to a third embodiment of the present invention. FIG. 16 is a vertical cross-sectional view of the vibration motor 30 shown in FIG.

[0072] The vibration motor 30 includes a stationary part 4 and a movable element 5. In this embodiment, the vibration motor 30 further includes an elastic member 6 and a substrate 7. The movable element 5 extends along the direction of a central axis J. The movable element 5 is capable of vibrating along the direction of the central axis J relative to the stationary part 1. The central axis J extends in a first direction. That is, the movable element 5 is capable of vibrating in the first direction.

[0073] <10-2 Stationary part> The stationary part 4 has a housing 41, a first bearing part 42, and a coil 43. In this embodiment, the stationary part 1 further has a lid part 44.

[0074] The housing 41 is a cylindrical member extending in the first direction. The housing 41 is not limited to a cylindrical shape, and may be, for example, a rectangular tube shape. In other words, the housing 41 may be a tube extending in the first direction. The housing 41 is made of a magnetic material. The magnetic material is, for example, stainless steel. The housing 41 accommodates the mover 5 and the coil 43 therein.

[0075] The first bearing portion 42 is a cylindrical sleeve bearing extending along the central axis J. The first bearing portion 42 is made of, for example, a resin having a low coefficient of friction and low wear. The resin is, for example, POM (polyacetal). The resin may also be LCP (liquid crystal polymer).

[0076] The first bearing portion 42 has a cylindrical hollow portion 42A extending in the first direction. The first bearing portion 42 has a first region 421, a second region 422, and a third region 423. The second region 422 is disposed on one side of the first region 421 in the first direction. That is, the first bearing portion 42 has a second region 422 disposed on one side of the first region 421 in the first direction. The third region 423 is disposed on the other side of the first region 421 in the first direction. The inner diameters of the first region 421, the second region 422, and the third region 423 are approximately the same. This forms a hollow portion 42A with a substantially constant diameter in the first direction.

[0077] The first region 421, the second region 422, and the third region 423 are integrally formed. The first region 421 is cylindrical and extends in the first direction. A conductor wire is wound around the radial outer periphery of the first region 421 to form the coil 43. The coil 43 is formed by winding the conductor wire around the central axis J. The radial inner surface of the coil 43 contacts the radial outer surface of the first region 421. That is, the first bearing 42 has the first region 421, and the first region 421 has an inner-coil region 421A disposed radially inward of the coil 43.

[0078] The radial outer end position of the first region 421 coincides with the radial inner end position of the coil 43. This allows the coil 43 to be wound around the first region 421 after the first bearing portion 42 is formed during manufacturing of the vibration motor 30, improving mass productivity of the vibration motor 30.

[0079] The second region 422 has a cylindrical base 422A extending in the first direction, and a third protrusion 422B protruding radially outward from the end of the base 422 on one side in the first direction. That is, the second region 422 has the third protrusion 422B protruding radially outward. The third protrusion 422B is annular. When manufacturing the vibration motor 30, the first bearing 42 is inserted into the housing 41 from one side in the first direction. By the insertion, the other side surface in the first direction of the third protrusion 422B comes into contact with the one side surface in the first direction of the housing 41 in the first direction. This allows the first bearing 42 to be positioned in the first direction with respect to the housing 41.

[0080] The first bearing portion 42 is disposed inside the housing 41. With the first bearing portion 42 accommodated within the housing 41, the housing 41 is disposed radially outward from the radially outer end of the coil 43. In other words, the stationary portion 4 has a cylindrical housing 41 that is disposed radially outward from the radially outer end of the coil 43 and extends in the first direction.

[0081] The radially outer surface of base portion 422A is disposed radially outward from the radially outer surface of coil 43. That is, the radially outer surface of second region 422 is disposed radially outward from the radially outer surface of first region 421. The other side surface in the first direction of second region 422 is disposed facing the one end of coil 43 in the first direction. This makes it possible to suppress movement of coil 43 toward one side in the first direction from the other side surface in the first direction of second region 422.

[0082] The third region 423 has a cylindrical shape extending in the first direction. A radially outer end of the third region 423 is disposed radially outward from a radially inner end of the coil 43. One side surface in the first direction of the third region 423 is disposed facing the other end of the coil 43 in the first direction. The third region 423 is a flange portion. This makes it possible to suppress the coil 43 from moving toward the other side in the first direction beyond one side surface in the first direction of the third region 423.

[0083] <10-3 Mover> The mover 5 has a core portion 51 and a holder 52 .

[0084] The core portion 51 is a cylindrical member extending along the direction of the central axis J. In this embodiment, the core portion 51 has, for example, two magnets arranged in the first direction and a magnetic body sandwiched between the magnets in the first direction. That is, the mover 5 has a magnet. In this embodiment, the mover 5 has a magnetic body. That is, the core portion 51 has a magnet. In this case, for example, the first direction one side of the magnet on the other side of the first direction is an N pole, and the first direction other side is an S pole. The first direction other side of the magnet on one side of the first direction is an N pole, and the first direction one side is an S pole. That is, the N poles face each other in the first direction with the magnetic body sandwiched between them. By forming the housing 41 from a magnetic body, it is possible to suppress leakage of the magnetic field generated by the magnet and the coil 43 to the outside of the vibration motor 30, and to increase the magnetic force. The magnetic poles of the magnets may be opposite to those described above in the first direction.

[0085] The holder 52 holds the other side end 51T in the first direction of the core portion 51. The holder 52 has a columnar recess 521 that is cylindrically recessed toward the other side in the first direction. The other side end 51T in the first direction is disposed within the columnar recess 521. The other side end 51T in the first direction is fixed to the columnar recess 521 by, for example, adhesion. That is, the holder 52 is fixed to the core portion 51. The magnet (core portion 51) is disposed on one side in the first direction of the holder 52 and is fixed to the holder 52.

[0086] The holder 52 functions as a weight and is made of, for example, a metal. One example of the metal is a tungsten alloy.

[0087] Holder 52 has a housing portion 522 recessed in an annular shape from the other side surface in the first direction to one side in the first direction. An end portion on one side in the first direction of elastic member 6 is housed in housing portion 522. Elastic member 6 is fixed to housing portion 522 by, for example, adhesion. That is, elastic member 6 is disposed on the other side in the first direction of holder 52. An end portion on one side in the first direction of elastic member 6 is fixed to holder 52. Movable element 5 has holder 52 fixed to elastic member 6.

[0088] The stationary part 4 has a lid part 44. The lid part 44 is a substantially disk-shaped member centered on the central axis J. The lid part 44 is disposed on the other side of the first direction than the movable element 5, and spreads in a direction intersecting the first direction. The lid part 44 has an annular recess 441 that is recessed in an annular shape from one side surface in the first direction to the other side in the first direction. The end of the elastic member 6 on the other side in the first direction is fixed to the annular recess 441. The elastic member 6 is fixed to the annular recess 441 by, for example, adhesion. That is, the end of the elastic member 6 on the other side in the first direction is connected to the lid part 44. The vibration motor 30 has an elastic member 6 that connects the movable element 5 and the lid part 44 and has elasticity.

[0089] The lid portion 44 has a flange portion 442 that protrudes in the radial direction. When manufacturing the vibration motor 30, the lid portion 44 is inserted into the housing 41 from the other side in the first direction. At this time, one side surface in the first direction of the flange portion 442 contacts the other side surface in the first direction of the housing 41 in the first direction. This makes it possible to position the lid portion 44 relative to the housing 41 in the first direction and to improve the strength of the vibration motor 30.

[0090] With this configuration, the mover 5 is supported by the cover portion 44 via the elastic member 6. When the elastic member 6 is in its natural length, a part of the core portion 51 on one side in the first direction is housed in the hollow portion 42A of the first bearing portion 42, as shown in FIG. 16 . This allows the core portion 51 to be supported by the first bearing portion 42 so that it can vibrate along the central axis J. That is, the first bearing portion 52 supports the mover 5 so that it can vibrate along the central axis J. That is, the first bearing portion 42 extends along the central axis J and supports the mover 5 so that it can vibrate along the central axis J.

[0091] With a part of the core portion 51 housed in the first bearing portion 42, the first bearing inner surface 42S of the first bearing portion 42 faces the radial outer surface of the core portion 51 in the radial direction. The first bearing inner surface 42S is the outer peripheral surface of the hollow portion 42A. That is, the first bearing portion 42 has the first bearing inner surface 42S arranged to face the radial outer surface of the mover 5 in the radial direction. When the mover 5 vibrates, if the mover 5 comes into contact with the first bearing inner surface 42S of the first bearing portion 42, the mover 5 slides against the stationary first bearing portion 42, so that the movement of the mover 5 is limited to the movement in the first direction. This makes it possible to suppress the phenomenon that the mover 5 is attracted to the housing 41 made of a magnetic material by an attractive force and sticks to it, and the mover 5 can be operated stably.

[0092] Furthermore, one side of the mover 5 in the first direction is supported by the first bearing portion 42, but is not supported in the first direction. This makes it possible to prevent the restoring force of the mover in the first direction from becoming greater than necessary, compared to a case in which the mover is supported from both sides in the first direction by elastic members or the like. This makes it possible to increase the vibration of the mover in the first direction. Furthermore, since there is no need to place an elastic member on one side of the mover 5 in the first direction, the configuration of the vibration motor 30 is simplified, and mass productivity is improved.

[0093] When a current is applied to the coil 43, a magnetic field is generated from the coil 43. The mover 5 vibrates in the first direction due to an interaction between the generated magnetic field and the magnetic field of the core portion 51. That is, when a current is applied to the coil 43, a driving force can be applied to the magnet.

[0094] Since the first region 421 has the inner-coil region 421A, the mover 5 and the coil 43 can be separated by the inner-coil region 421A. This makes it possible to reduce the radial thickness of the inner-coil region 421A, and thus makes it possible to reduce the size of the vibration motor 30 in the radial direction.

[0095] Moreover, the second region 422 is disposed on one side in the first direction relative to one end in the first direction of the coil 43. Therefore, by providing the second region 422 in the first bearing portion 42 in addition to the first region 421, the length in the first direction of the inner surface of the first bearing portion 42 that faces the mover 5 in the radial direction becomes longer, and the inclination of the mover 5 during vibration can be suppressed. This stabilizes the vibration of the vibration motor 30.

[0096] 16, a part of the mover 5 is disposed radially inward of each of the radial inner side surface of the first region 421 and the radial inner side surface of the second region 422. More specifically, when the elastic member 6 is in a natural length state, a part of the mover 5 is disposed radially inward of each of the radial inner side surface of the first region 421 and the radial inner side surface of the second region 422. This increases the vertical length of the mover 5 radially facing the inner side surface of the first bearing portion 42, thereby suppressing the inclination of the mover 5 during vibration. Therefore, the vibration can be stabilized. Note that when the elastic member 6 is in a natural length state, a part of the mover 5 does not have to be positioned radially inward of the second region 422.

[0097] Moreover, the first bearing portion 42 has a third region 423 disposed above the first region 421. This increases the length in the first direction of the inner surface of the first bearing portion 42 that faces the mover 5 in the radial direction, thereby further suppressing tilt of the mover 5 during vibration. Note that the radial outer end of the third region 423 may be disposed radially inward of the radial inner end of the coil 43.

[0098] Moreover, the first direction one side surface 52A of the holder 52 is disposed directly opposite the first direction other side surface 423A of the third region 423 in the up-down direction. That is, the mover 5 has a surface 52A disposed directly opposite the first direction other side surface 423A of the third region 423 in the first direction. This allows the surface 52A of the mover 5 to come into contact with the first direction other side surface 423A of the third region 423, and the movement of the mover 5 to one side in the first direction can be restricted. In particular, since the inner diameter of the second region 422 is approximately constant in the first direction, the movement of the mover 5 to one side in the first direction is restricted as described above, and therefore the mover 5 to one side in the first direction beyond the second region 422 can be suppressed. Furthermore, as described later, when the substrate 7 is disposed on one side in the first direction of the second region 422, the gap between the mover 5 and the substrate 7 in the first direction can be appropriately maintained.

[0099] 16, the holder 52 has a protruding portion 523 that protrudes toward the other side in the first direction. The protruding portion 523, i.e., the other side surface in the first direction 523A of the holder 52, is disposed directly opposite in the first direction to the one side surface in the first direction 44A of the cover portion 44. This allows the one side surface in the first direction 523A of the holder 52 to come into contact with the one side surface in the first direction 44A of the cover portion 44, thereby restricting movement of the mover 5 toward the other side in the first direction.

[0100] 16, the other side surface 43A in the first direction of the coil 43 is disposed opposite in the first direction to the one side surface 52A in the first direction of the holder 52. This makes it possible to reduce the radial size of the vibration motor 30 compared to a case in which the other side surface 43A in the first direction of the coil 43 is entirely disposed radially outward from the one side surface 52A in the first direction of the holder 52.

[0101] <10-4 Electrical connection configuration between the board and the coil> Fig. 17 is a perspective view showing a configuration related to an electrical connection between the substrate 7 and the coil 43. As shown in Fig. 17, a recess 42B extending in the first direction and recessed radially inward is formed on the radially outer side surface of the second region 422. A part of the lead wire 431 drawn out from the coil 43 is accommodated in the recess 42B. Note that the entire lead wire 431 may be accommodated in the recess 42B. In other words, it is sufficient that at least a part of the lead wire 431 is accommodated in the recess 42B.

[0102] This eliminates the need to route the lead wire 431 radially outward from the first bearing portion 42. Therefore, compared to the case where the lead wire 431 is routed radially outward from the first bearing portion 42, it is possible to suppress interference of the lead wire 431 with other portions or other members in the vibration motor 30, and it is possible to reduce the size of the vibration motor 30 in the radial direction. In addition, the manufacturing efficiency of the vibration motor 30 is improved.

[0103] 17, the substrate 7 is disposed on one side in the first direction relative to the second area portion 422 and extends in the radial direction. The substrate 7 may be a flexible printed circuit board or a rigid printed circuit board.

[0104] The first bearing portion 42 has a first protrusion 42C protruding toward one side in the first direction from one side surface in the first direction of the second region portion 422. An end portion on one side in the first direction of the lead wire 431 drawn out toward one side in the first direction is wound around the first protrusion 42C. In other words, the lead wire 431 is tied up around the first protrusion 42C.

[0105] The substrate 7 has a first electrode portion 71 and a second electrode portion 72. The first electrode portion 71 and the second electrode portion 72 are electrically connected by a wiring pattern (not shown in FIG. 17) inside the substrate 7. When manufacturing the vibration motor 30, the substrate 7 is attached to the second region portion 422, and the first electrode portion 71 and the lead wire 431 tied to the first protrusion 42C are electrically connected by soldering or the like. This operation may be automatic or manual. Therefore, the vibration motor 30 can be manufactured with better workability than when the lead wire is directly connected to the substrate. In addition, the mechanism for tying the lead wire 431 to the first protrusion 42C improves the reliability of the electrical connection between the lead wire and the substrate 7 even if the outer diameter of the lead wire is small. Therefore, whether the outer diameter of the lead wire is small or large, the reliability of the electrical connection between the lead wire and the substrate is improved, so that the outer diameter of the lead wire can be adjusted to suit the application of the vibration motor, making it easier to adjust the electrical resistance and output characteristics of coil 43.

[0106] In this manner, the end portion on one side in the first direction of the lead wire 431 drawn out from the coil 43 to one side in the first direction is electrically connected to the substrate 7. This makes it easy to route the lead wire 431 for electrically connecting the coil 43 and the substrate 7.

[0107] Furthermore, the substrate 7 has a plurality of notches 7A recessed from the radial outer edge of the substrate 7 toward the central axis J. The first bearing portion 42 has a plurality of second protrusions 42D protruding downward from the lower surface of the second region portion 422. The plurality of second protrusions 42D are housed in the plurality of notches 7A. This allows the substrate 7 to be positioned.

[0108] <10-5 First modified example of bearing portion> 18 is a diagram showing a partial configuration of the first bearing portion 42 according to a modified example. In the modified example shown in FIG. 18, the entire coil 43 is disposed inside the first region 421 and is integrally formed with the first region 421. The inner-coil region 421A is a part of the first region 421. Note that a part of the coil 43 may be disposed inside the first region 421. That is, it is only necessary that at least a part of the coil 43 is disposed inside the first region 421 and is integrally formed with the first region 421. This allows the coil 43 to be firmly fixed to the first bearing portion 42.

[0109] 18, the lead wire 431 drawn out from the coil 43 is disposed inside the second region 422 and is formed integrally with the second region 422. This allows the lead wire 431 to be firmly fixed to the first bearing portion 42.

[0110] The configuration shown in FIG. 18 can be formed by insert molding.

[0111] <10-6 Second modified example of bearing portion> Fig. 19 is a perspective view showing one side end 42BT in the first direction of the first bearing portion 42 according to another modified example. Fig. 19 is a view showing a state in which the substrate 7 has been removed. One side end 42BT in the first direction of the first bearing portion 42 corresponds to one side end in the first direction of the second region portion 422.

[0112] As shown in FIG. 19, the first direction one side end 42BT is formed with a groove-shaped communication part 4221 that extends in the radial direction and is recessed from the first direction one side surface of the first bearing part 42 to the first direction other side. The communication part 4221 communicates the radial inner space of the first direction one side end 42BT with the radial outer space. That is, the first bearing part 42 has the communication part 4221 that communicates the internal space of the first bearing part 42 with the external space of the first bearing part 42. As a result, when the mover 5 vibrates in the first direction, the gas inside the first bearing part 42 is discharged to the outside of the first bearing part 42 through the communication part 421, so that it is possible to suppress a decrease in the amplitude of vibration due to compression of the gas inside the first bearing part 42. Furthermore, in a configuration in which the substrate 7 is arranged on one side of the first bearing portion 42 in the first direction as in this embodiment, a configuration in which a communicating portion 4221 is provided to exhaust gas inside the first bearing portion 42 to the outside of the first bearing portion 42 is particularly useful.

[0113] The communicating portion 4221 is not limited to a groove shape, and may be formed, for example, as a through hole that penetrates the first bearing portion 42 in the radial direction.

[0114] <10-7 Modifications of holder> FIG. 20 is a partial perspective view showing a modified example of the holder 52. The holder 52 according to the modified example shown in FIG. 20 has a storage section 524 instead of the storage section 522 in the above-described embodiment (FIG. 16). The storage section 524 has a circular first direction other side surface 524A centered on the central axis J, and a wall surface 524B extending from the radial inner edge of the first direction other side surface 524A to the first direction other side. That is, the storage section 524 corresponds to a configuration in which the radially outer wall surface is not provided in the circularly recessed storage section 522 (FIG. 16). The first direction one side end of the elastic member 6 is stored in the storage section 524 and fixed to the storage section 524. According to the configuration of the storage section 524, even if the holder 52 and the elastic member 6 are small in size, it is easy to inject an adhesive into the storage section 524.

[0115] <10-8 Regarding the size of the vibration motor>

[0116] The outer diameter D1 (FIG. 16) of the housing 41 is preferably 10 mm or less. For example, D1=7 mm. Furthermore, the outer diameter D1 is more preferably 4 mm or less. For example, D1=3 mm. Furthermore, the inner diameter D2 of the first bearing portion 42 is preferably 8 mm or less. For example, D2=5 mm. Furthermore, the inner diameter D2 is preferably 1 mm or more and 2 mm or less. For example, D2=1.5 mm. This allows the mover 2 to stably operate in a small vibration motor 30. In particular, when the vibration motor is mounted on an electronic pen, it is necessary to make the outer diameter of the electronic pen a size that fits within the size of a human hand when the vibration motor is mounted on the electronic pen, so it is important to make the outer diameter of the vibration motor small. Among them, the outer diameter of the vibration motor is set to 10 mm or less for a thick electronic pen, and the outer diameter of the vibration motor is set to 4 mm or less for a thin electronic pen, so that the vibration motor can be mounted on electronic pens of various shapes.

[0117] Furthermore, when the housing has a shape other than a cylinder, it is preferable that the long side of the outer edge of the housing in a plane perpendicular to the first direction is 10 mm or less. For example, when the housing 41 has a rectangular tubular shape, it is preferable that the long side of the outer edge of the rectangular shape of the housing 41 is 10 mm or less. When the housing has a shape other than a cylinder, it is preferable that the long side of the inner edge of the first bearing portion in a plane perpendicular to the first direction is 8 mm or less. When the first bearing portion 42 has a rectangular tubular shape, it is preferable that the long side of the inner edge of the rectangular shape of the first bearing portion 42 is 8 mm or less.

[0118] Furthermore, it is preferable that the first direction length L1 of the first bearing inner side surface 42S of the first bearing portion 42 is 70% or more and 90% or less of the first direction length L2 of the core portion 51. This makes it possible to prevent the movement of the mover 5 from becoming unstable due to the first direction length L1 of the first bearing inner side surface 42S being too short. Also, it is possible to prevent the first bearing portion 12 from interfering with the holder 52 and the first direction length over which the holder 52 holds the core portion 51 from becoming short due to the first direction length L1 of the first bearing inner side surface 42S being too long.

[0119] <11. Equipment to be installed> FIG. 21 is a diagram showing a touch pen 50 as an example of a target device equipped with a vibration motor 10. The touch pen 50 is a device that operates a device such as a smartphone or a tablet by touching the touch panel of the device. By mounting the vibration motor 10 on the touch pen 50, the touch pen 50 can be vibrated to provide haptic feedback to the user. That is, the touch pen 50 is an example of a haptic device having the vibration motor 10. That is, the haptic device has the vibration motor 10. For example, the haptic feedback can provide the user with a sensation as if he or she were writing characters on paper or the like with the touch pen 50. By mounting the vibration motor 10 on the haptic device, stable haptic feedback can be realized.

[0120] Furthermore, the vibration motor 10 can be mounted not only on a touch pen but also on various devices such as an air-operated device. For example, the vibration motor 10 can be mounted on a device such as an electronic pen, an electronic writing tool, or a mouse, and the device can be made into an electronic device capable of inputting stereoscopic images or virtual reality images.

[0121] The same applies to vibration motors of various embodiments other than the vibration motor 10 with respect to the above-mentioned target devices.

[0122] <12.Other> The embodiment of the present invention has been described above. Note that the scope of the present invention is not limited to the above embodiment. The present invention can be implemented by adding various modifications to the above embodiment without departing from the spirit of the invention. [Industrial Applicability]

[0123] The present invention can be used, for example, in vibration motors mounted on various devices such as portable devices. [Explanation of symbols]

[0124] 1...Stationary part 2...Mover 3. Elastic member 10. Vibration motor 11. Housing 12...First sleeve bearing 13...Second lid part 14. Coil 15...Second sleeve bearing 20. Vibration motor 21. Magnet 21A, 21B: Magnet section 22...Magnetic material 23. Holder 23A...Columnar recess 24... First sliding member 25...Second sliding member 41, 42... First and second cushioning members 101...Vibration motor 102...Vibration motor 104...Vibration motor 105...Vibration motor 106...Vibration motor 107...Vibration motor 121...1st lid part 121A...Through hole 122...1st bearing part 122A...Inner surface of the first bearing 122B...Other side end in the first direction 122C...One side end in the first direction 151...Second lid part 152...2nd bearing part 152A...2nd bearing inner surface 211...partial 1221 Groove 1221A...Other side end in the first direction 1221B...One end in the first direction 1222 Air passage 1222A...Other side end in the first direction 1223 Air vent 1522 Air passage 1522A...One end in the first direction 1523 Air hole J...center axis P1...One side part in the first direction P2...Other side part in the first direction S1...Gap S2...Gap 4...Stationary part 5...Mover 6. Elastic member 7. Circuit Board 7A...Notch 30...Vibration motor 41. Housing 42...1st bearing part 42A...Hollow part 42B Recess 42C···First protrusion 42D...Second protrusion 42S...Inner surface of the first bearing 42BT...One end in the first direction 4221...Communication part 43 Coil 44...Lid part 51 Core section 52 Holder 71...1st electrode part 72...Second electrode part 50···Touch pen 421...1st area part 421A: Inner coil area 422...Second area part 422A...Base 422B...Third protrusion 423...Third area part 431...Leader line 441... Circular recess 442 Flange part 521...Columnar recess 522... Storage unit 523...Protrusion

Claims

1. A stationary portion; a mover having a magnet and capable of vibrating in a first direction; Equipped with The stationary portion is A coil capable of applying a driving force to the magnet when energized; a housing that accommodates the mover and the coil therein; a first bearing portion arranged inside the housing and made of a magnetic material; having The first bearing portion has a first bearing inner surface disposed radially opposite to a radial outer surface of the mover.

2. A stationary portion; a mover having a magnet and capable of vibrating in a first direction; Equipped with The stationary portion is A coil capable of applying a driving force to the magnet when energized; a housing that accommodates the mover and the coil therein; A first bearing portion disposed inside the housing; having the first bearing portion has a first bearing inner surface disposed radially opposite to a radial outer surface of the mover, The first bearing inner surface has at least one groove extending along the first direction.

3. The vibration motor according to claim 2 , wherein the other end of the groove in the first direction is disposed at the other end of the first bearing in the first direction.

4. 4. The vibration motor according to claim 2, wherein an end of the groove on one side in the first direction is located on the other side in the first direction relative to an end of the first bearing on one side in the first direction.

5. A stationary portion; a mover having a magnet and capable of vibrating in a first direction; Equipped with The stationary portion is A coil capable of applying a driving force to the magnet when energized; a housing that accommodates the mover and the coil therein; A first bearing portion disposed inside the housing; having the first bearing portion has a first bearing inner surface disposed radially opposite to a radial outer surface of the mover, The first bearing portion is an air passage disposed along the first direction; an air hole disposed on the first bearing inner surface and communicating with the air passage.

6. The vibration motor according to claim 5 , wherein the air passage communicates with a space on the other side of the first bearing portion in the first direction.

7. A stationary portion; a mover having a magnet and capable of vibrating in a first direction; Equipped with The stationary portion is A coil capable of applying a driving force to the magnet when energized; a housing that accommodates the mover and the coil therein; A first bearing portion disposed inside the housing; having the first bearing portion has a first bearing inner surface disposed radially opposite to a radial outer surface of the mover, The first bearing portion has a communication portion that communicates an internal space of the first bearing portion with an external space of the first bearing portion.

8. A stationary portion; a mover having a magnet and capable of vibrating in a first direction; Equipped with The stationary portion is A coil capable of applying a driving force to the magnet when energized; a housing that accommodates the mover and the coil therein; A first bearing portion disposed inside the housing; having the first bearing portion has a first bearing inner surface disposed radially opposite to a radial outer surface of the mover, The coil is fixed to the other end surface of the first bearing portion in the first direction.

9. A stationary portion; a mover having a magnet and capable of vibrating in a first direction; Equipped with The stationary portion is A coil capable of applying a driving force to the magnet when energized; a housing that accommodates the mover and the coil therein; A first bearing portion disposed inside the housing; having the first bearing portion has a first bearing inner surface disposed radially opposite to a radial outer surface of the mover, the stationary portion has a second bearing portion disposed inside the housing on the other side in the first direction relative to the first bearing portion, The second bearing portion has a second bearing inner surface disposed radially opposite to a radial outer surface of the mover.

10. The stationary portion is a first cover portion that is disposed on one side of the movable element in a first direction and extends in a direction intersecting the first direction; a first buffer member disposed between the first cover portion and the movable element in the first direction; The vibration motor according to claim 1 , further comprising:

11. the first cover portion is disposed opposite to an end surface of the movable element on one side in the first direction, The vibration motor according to claim 1 , wherein the first cover portion has at least one through-hole penetrating in the first direction.

12. The vibration motor according to claim 1 , wherein a lubricant or a magnetic fluid is disposed between the radially outer surface of the mover and the first bearing inner surface.

13. The mover has a first sliding member disposed radially outward of the magnet, The vibration motor according to claim 1 , wherein a radially outer side surface of the first sliding member radially faces an inner side surface of the first bearing.

14. the stationary portion is disposed on the other side of the movable element in the first direction and has a second cover portion extending in a direction intersecting the first direction, The vibration motor according to claim 1 , further comprising an elastic member that connects the mover and the second cover portion and has elasticity.

15. The movable member has a holder fixed to the elastic member, The vibration motor according to claim 14 , wherein the magnet is disposed on one side of the holder in the first direction and is fixed to the holder.

16. The vibration motor according to claim 15 , wherein the movable element has a second sliding member disposed radially outward of the holder and sliding against a radially inner surface of the housing.

17. 17. The vibration motor according to claim 15, wherein the other side surface of the coil in the first direction is disposed opposite to the one side surface of the holder in the first direction.

18. The vibration motor according to claim 1 , wherein the coil is fixed to a radially inner surface of the housing.

19. The stationary portion is a second cover portion that is disposed on the other side of the movable element in the first direction and extends in a direction intersecting the first direction; a second buffer member disposed between the second cover portion and the movable element in the first direction; The vibration motor according to any one of claims 1 to 18, comprising:

20. The outer diameter of the housing or the long side of the outer edge of the housing in a plane perpendicular to the first direction is 10 mm or less, 20. The vibration motor according to claim 1, wherein an inner diameter of the first bearing portion or a long side of an inner edge of the first bearing portion in a plane perpendicular to the first direction is 8 mm or less.

21. The mover is A holder and a core portion disposed on one side of the holder in a first direction and fixed to the holder; having The core portion has the magnet, 21. The vibration motor according to claim 1, wherein a length in the first direction of the first bearing inner surface is 70% or more and 90% or less of a length in the first direction of the core portion.

22. A haptic device comprising a vibration motor according to any one of claims 1 to 21.

Images