JP2006166665A - Vibrating motor and electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibrating motor with strong vibration, which is sensitive for a user, and an electronic device equipped with the vibrating motor. <P>SOLUTION: At a fitting part 4a of a shaft sleeve 4, a part 4b to be fitted to a fitting part of a bearing is formed in a sinecurve shape around a circle so that it waves in a thrust direction. Similarly, a part facing the sinecurve-shaped face 4b at the fitting part of the bearing is formed in a sinecurve shape around a circuit so that it waves with the same cycle in a thrust direction. Then, while a rotor 17 is rotated, vibration in the thrust direction can be applied to the rotor 17, so vibration in the thickness direction of the device can be caused when the vibration motor is mounted, as an example, on a thin electronic device, which is not illustrated. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vibration motor that generates vibration and an electronic device including the vibration motor, and more particularly to a thin and flat vibration motor in an axial direction of rotation and an electronic device including the vibration motor.

  2. Description of the Related Art Conventionally, there are many devices in which a vibration motor is mounted on a device such as a mobile phone device in order to exhibit a vibration function. As a vibration motor, for example, a general cylindrical vibration motor is employed. In this vibration motor, a weight that forms an unbalance is attached to the tip of a rotary shaft extending from the motor body, and the weight is rotated to generate vibration in the rotational radial direction of the motor.

  In recent years, flat type vibration motors have been used with the thinness of devices such as mobile phone devices (see, for example, Patent Document 1). Among flat vibration motors, brushless vibration motors have also appeared, improving durability and reliability.

Furthermore, some flat vibration motors are provided with a magnet attached to a rotor and a stator yoke facing the magnet, and a part of the stator yoke is closer to the magnet than the other part. Some motors are also configured. This is because, due to Coulomb's law of magnetism, the magnetic attractive force generated between the magnet and a part of the magnet is stronger than the other part, so that the rotation of the rotor does not become smooth, resulting in vibration. Is. (For example, refer to Patent Document 2).
Japanese Patent Application Laid-Open No. 9-2985859 (paragraph [0016], FIG. 1 etc.) Japanese Patent Publication No. 7-83582 ([Action], Fig. 1 etc.)

  However, the vibration motor described in Patent Document 2 has a problem in that strong vibration cannot be obtained because vibration is generated only by the difference in magnetic attractive force. In addition, since the vibration direction is determined to be the rotational diameter direction of the motor, for example, when the flat vibration motor described in Patent Document 2 is mounted on a thin electronic device, the vibration direction of the motor is There is a characteristic that vibrations in the thickness direction of the thin device are easy to vibrate in the direction perpendicular to the thickness direction, and the vibrations in the thickness direction in which the user feels vibrations are difficult to occur. Accordingly, this makes the device less susceptible to vibration.

  In view of the circumstances as described above, an object of the present invention is to provide a vibration motor that is easy for a user to feel vibration and an electronic device equipped with the vibration motor.

  An object of the present invention is to provide a vibration motor capable of obtaining as much vibration as possible and an electronic apparatus equipped with the vibration motor.

  In order to achieve the above object, a vibration motor according to the present invention includes a stator, a rotor rotatable with respect to the stator, a shaft serving as a rotation shaft of the rotor, and the shaft supported by the rotor. The shaft support part which can give the vibration of the axial direction of this, and the drive mechanism for rotationally driving the said rotor are comprised.

  In the present invention, since the vibration in the axial direction can be applied to the rotor, for example, when the vibration motor is mounted on a thin device, the rotor can be vibrated in the thickness direction of the device. This makes it easier for the user to feel the vibration of the device. For example, when the vibration motor according to the present invention is a flat vibration motor, when the user carries a thin device, the device is placed in a clothing pocket or the like with the axial direction facing the human body. Therefore, the user can easily feel the vibration by vibrating in the axial direction. In addition, since the rotor is vibrated through the shaft in the shaft support portion provided at the rotation center portion, more stable vibration can be obtained.

  Examples of the drive mechanism include those that are driven by electromagnetic action or electrostatic action. The same applies hereinafter.

  According to an aspect of the present invention, the shaft support portion has a first wavefront provided so as to wave in the axial direction, and is provided on the rotor and a sleeve to which the shaft is fixed; A second wavefront which is provided so as to wave in the axial direction at substantially the same period as the first wavefront, and which is in contact with and faces the first wavefront, and is provided on the stator and supports the shaft. Bearing. In the present invention, when the rotor rotates, the peaks of the first and second wave fronts periodically come into contact with each other, so that it is possible to mechanically create axial vibration. Thereby, the strongest vibration is obtained. In addition, optimal vibration can be created by appropriately designing the wave numbers of the first and second wavefronts according to the size of the vibration motor.

  “Axial support” means that the bearing supports the shaft so that the rotor can vibrate at least in the axial direction. The same applies hereinafter.

  According to an aspect of the present invention, the shaft support portion includes a first wavefront provided to wave in the axial direction, and a plurality of protrusions protruding from the first wavefront, A sleeve which is provided on the rotor and to which the shaft is fixed, and which is provided so as to wave in the axial direction at substantially the same cycle as the first wavefront, and which is opposed to the first wavefront, and contacts each projection. A second wavefront in contact therewith, and a bearing provided on the stator and supporting the shaft. As a result, the first wavefront and the second wavefront are not in direct contact with each other, but the projections and the second wavefront are in contact with each other, so that the contact area is reduced and noise reduction can be achieved.

  Examples of the shape of the protruding portion include a triangular shape, a trapezoidal shape, and a partial shape of a sphere. The same applies hereinafter. By using a part of the sphere, the contact area with the second wavefront can be reduced as much as possible, and the noise reduction is further improved.

  According to an aspect of the present invention, the sleeve includes a sphere that constitutes each of the protrusions, and a concave portion that is provided on the plane and that rotatably accommodates the sphere. Thereby, since friction with a spherical body and the 2nd wave front can be made small, wear can be controlled and further silence can be achieved.

  According to an aspect of the present invention, the shaft support portion has a first wavefront provided so as to wave in the axial direction, and is provided on the rotor and a sleeve to which the shaft is fixed; A second wavefront opposed to the first wavefront provided to wave in the axial direction at substantially the same period as the first wavefront, and a projection protruding from the second wavefront to contact the first wavefront. A plurality of projecting portions in contact with each other, and a bearing provided on the stator and supporting the shaft. As a result, the first wavefront and the second wavefront are not in direct contact with each other, but the projections and the first wavefront are in contact with each other, so that the contact area is reduced and noise reduction can be achieved.

  According to an aspect of the present invention, the bearing includes a sphere that constitutes each of the protrusions, and a concave portion that is provided on the plane and that rotatably accommodates the sphere. Thereby, since friction with a spherical body and the 1st wave front can be made small, wear can be controlled and further silence can be achieved.

  According to an aspect of the present invention, the shaft support portion periodically has first uneven surfaces protruding and recessed in the axial direction in the rotational circumferential direction, and is provided on the rotor and the shaft is fixed. And a second concavo-convex surface that protrudes and sinks in the axial direction at substantially the same cycle as the first concavo-convex surface and can abut against the first concavo-convex surface. And a bearing that pivotally supports the shaft. In the present invention, when the rotor rotates, the crests of the first and second uneven surfaces periodically come into contact with each other, so that it is possible to mechanically create an axial vibration. Thereby, the strongest vibration is obtained. Examples of the shape of the convex portion or concave portion of the uneven surface include a triangular shape, a trapezoidal shape, or a partial shape of a sphere.

  According to an aspect of the present invention, the shaft support portion includes a plane parallel to the rotation radial direction of the rotor and a plurality of protrusions protruding from the plane, and is provided on the rotor and the shaft And a bearing having a wave surface provided so as to be undulated in the axial direction while being in contact with each of the protrusions so as to face the plane, and provided on the stator and supporting the shaft. Have In the present invention, when the rotor rotates, each projection and, for example, a crest portion of the wavefront periodically come into contact with each other, so that an axial vibration can be mechanically created. Thereby, the strongest vibration is obtained. Moreover, since each protrusion part and the 2nd wave front contact | abut, the contact area can be decreased and it can attain silence.

  According to an aspect of the present invention, the shaft support portion has a wavefront provided to wave in the axial direction, and is provided on the rotor and is opposed to the wavefront and a sleeve to which the shaft is fixed. And a plane parallel to the rotational radial direction of the rotor, a projection protruding from the plane and abutting against the wavefront, and a bearing provided on the stator and supporting the shaft. May be.

  According to an aspect of the present invention, the vibration motor further includes a weight attached to the rotor and configured to vibrate the rotor in the rotational radial direction of the rotor. As a result, since vibration is obtained in a three-dimensional direction as a result, the user can easily feel the vibration.

  A vibration motor according to another aspect of the present invention includes a stator, a rotor that is rotatable with respect to the stator, a vibration mechanism that vibrates the rotor in a rotation axis direction of the rotor, and rotationally drives the rotor. A driving mechanism.

  In the present invention, since the rotor can be vibrated in the axial direction, for example, when a vibration motor is mounted on a thin device, it can be vibrated in the thickness direction of the device, and the user can vibrate the device. It becomes easier to feel. In addition, since the rotor is vibrated through the shaft in the shaft support portion provided at the rotation center portion, more stable vibration can be obtained.

  An electronic apparatus according to the present invention supports a stator, a rotor that can rotate with respect to the stator, a shaft that serves as a rotation shaft of the rotor, and supports the shaft, and applies vibration in the axial direction of the shaft to the rotor. A vibration motor having a shaft support portion capable of rotating, and a drive mechanism for rotationally driving the rotor, and a housing containing the vibration motor.

  In the present invention, since the vibration in the axial direction can be applied to the rotor, for example, when the electronic device is a thin device, it can be vibrated in the thickness direction of the device, and the user feels the vibration of the device. It becomes easy. Examples of the electronic device include a mobile phone device, a PDA (Personal Digital Assistance), a watch, a pager, and other portable electronic devices. The same applies hereinafter.

  As described above, according to the present invention, the vibration of the vibration motor can be easily felt by the user, and a strong vibration can be created as much as possible.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing a vibration motor according to an embodiment of the present invention. 2 is an exploded perspective view of the vibration motor shown in FIG. 1, and FIG. 3 is a cross-sectional view of the vibration motor shown in FIG.

  The vibration motor 10 includes a plate-shaped stator yoke 1 and a disk-shaped rotor yoke 2. As shown in FIGS. 1 and 3, the shaft 3 is inserted into the shaft hole 8 e of the bearing 8 that is fitted and fixed in the central hole 1 a of the stator yoke 1. The shaft 3 is inserted and fixed in the shaft hole 4e of the shaft sleeve 4 fitted and fixed in the hole 2a in the center of the rotor yoke 2. That is, the shaft 3 is supported by the shaft sleeve 4 and the bearing 8. As shown in FIG. 2, the stator yoke 1 and the bearing 8 constitute a stator 15, and the rotor yoke 2, the shaft sleeve 4 and the magnet 9 constitute a rotor 17.

  The stator yoke 1 and the bearing 8 are fixed by caulking, for example. The same applies to the rotor yoke 2 and the shaft sleeve 4. The shaft 3 is fixed to the shaft sleeve 4 by press fitting, for example.

  On the stator yoke 1, a thin substrate, for example, a flexible substrate 5, on which a plurality of coils 7 are mounted is provided. A disc-shaped magnet 9 is mounted on the lower surface of the rotor yoke 2 so as to face these coils 7. A control circuit (not shown) for causing the current to flow through the coil 7 and rotating the rotor 17 is electrically connected to the flexible substrate 5. In this example, six coils 7 are provided, and, for example, driving is controlled with three phases and two poles by the control circuit. The number of coils, the number of poles, etc. are not limited to three-phase two-pole.

  The bearing 8 rotatably supports the shaft 3 and supports the shaft 3 so that the shaft 3 can vibrate in the axial direction, that is, the thrust direction. Specifically, it is only necessary to have oil between the bearing 8 and the shaft 3. For example, the bearing 8 is made of sintered oil-impregnated metal or the like. A weight 6 is attached to the side surface of the rotor yoke 2. The weight 6 is used to eccentric the rotor 17 in terms of weight. By attaching the weight 6, the rotor 17 can be vibrated in the radial direction when the rotor 17 rotates. The weight 6 is made of, for example, a metal having a large specific gravity.

  A cover (not shown) is put on the rotor yoke 2 from above, and this cover is attached to the stator yoke 1.

  FIG. 4 is a perspective view showing the lower surface side of the shaft sleeve 4 upward, and FIG. 5 is a perspective view showing the bearing 8.

  On the lower surface side of the shaft sleeve 4, that is, the side facing the bearing 8, for example, a cylindrical contact portion 4 a having a diameter smaller than the maximum diameter of the shaft sleeve 4 is provided. On the other hand, on the upper surface side of the bearing 8, that is, the side facing the contact portion 4a of the shaft sleeve 4, a cylindrical contact portion 8a having the same diameter as the contact portion 4a is provided.

  A portion 4b of the abutting portion 4a of the shaft sleeve 4 that abuts on the abutting portion 8a of the bearing 8 is formed in a sine wave surface shape over one circumference so as to wave in the thrust direction. On the other hand, the portion 8b facing the sine wave surface 4b in the contact portion 8a of the bearing 8 is also formed in a sine wave surface shape over the entire circumference so as to wave in the thrust direction. The shaft sleeve 4 and the bearing 8 are pressed against each other by a magnetic attractive force acting between the magnet 9 and the stator yoke 1, so that both wave fronts 4 b and 8 b are always in contact with each other.

  FIG. 6 is a diagram showing the shapes of the sine wavefronts 4b and 8b. In this way, the sine wavefronts 4b and 8b have a sine wavefront formed at the same period, and two peaks are formed at 360 ° per round. With such a configuration, when the rotor 17 rotates, the rotor 17 vibrates in the thrust direction. The height difference between the peak 4b-1 that is the highest part of the sine wavefront 4b of the shaft sleeve 4 and the valley 4b-2 that is the lowest part is set to about 0.4 mm, for example. That is, the amplitude is set to about 0.2 mm. On the other hand, the height difference between the peak 8b-1 that is the highest part of the sine wavefront 8b of the bearing 8 and the valley 8b-2 that is the lowest part is set to about 0.2 mm, for example. That is, the amplitude is set to about 0.1 mm. These amplitudes may be the same value for the sine wavefronts 4b and 8b. The number of waves for one rotation, the amplitude, and the like can be set as appropriate, and are not limited to these numerical values.

  The vibration in the thrust direction of the vibration motor 10 will be described more specifically. For example, when the shaft 17 moves relative to the bearing 8 to a position where the crest 4b-1 of the sine wavefront 4b contacts the valley 8b-2 of the sine wavefront 8b by the rotation of the rotor 17, the rotor 17 It approaches the stator 15 most. Conversely, when the shaft sleeve 4 moves relative to the bearing 8 to a position where the crest 4b-1 of the sine wavefront 4b abuts the crest 8b-1 of the sine wavefront 8b by the rotation of the rotor 17, the rotor 17 Is farthest from the stator 15. While the rotor 17 rotates once, the rotor 17 vibrates once in the radial direction and twice in the thrust direction.

  As shown in FIG. 7, in the conventional cylindrical vibration motor, a weight 102 for eccentricity is attached to a motor shaft 101 extending from the motor body 100. In this case, vibration could be obtained only in the radial direction of rotation.

  However, according to the vibration motor 10 according to the present embodiment, the rotor 17 can be vibrated in the thrust direction. For example, when the vibration motor 10 is mounted on a thin electronic device (not shown), the device Can be vibrated in the thickness direction. This makes it easier for the user to feel the vibration of the device. Moreover, since the vibration motor 10 naturally vibrates in the radial direction by the weight 6, the vibration motor 10 vibrates three-dimensionally as a whole, and the user feels stronger vibration.

  Further, since the rotor 17 is vibrated via the shaft 3 in the shaft sleeve 4 and the bearing 8 provided at the rotation center portion of the vibration motor 10, more stable vibration can be obtained.

  Furthermore, since the vibration in the thrust direction is mechanically created by the contact of the sine wavefronts 4b and 8b, not the magnetic attraction force as in the prior art, the strongest vibration can be obtained.

  FIG. 8 is a perspective view of another embodiment of the shaft sleeve. FIG. 9 is a side view showing a state in which the shaft sleeve 24 shown in FIG. 8 and the above-described bearing 8 are in contact with each other. In addition, illustration of the shaft 3 is abbreviate | omitted in FIG. Similarly, the shaft 3 is not shown in FIGS. 11, 12, and 14 to be described later.

  A surface 24b facing the bearing 8 in the contact portion 24a of the shaft sleeve 24 is formed in a flat shape. For example, two spherical protrusions 24c are provided on the flat surface 24b with an interval of 180 °. As shown in FIG. 9, these protrusions 24 c are in contact with the sine wave surface 8 b in the contact portion 8 a of the bearing 8. The relationship between the height difference A between the peaks 8b-1 and valleys 8b-2 of the sine wavefront 8b and the height B of the protrusion 24c is preferably A ≦ B. This is because the rotation of the rotor 17 prevents the flat surface 24b and the peak 8b-1 of the sine wave surface 8b from contacting each other as much as possible when the tip of the protrusion 24c moves to a position where it abuts the valley 8b-2 of the sine wave surface 8b. It is to do. Even with such a configuration of the shaft sleeve 24, the rotor 17 can be vibrated in the thrust direction by the rotation of the rotor 17 (see FIGS. 1 to 3). Moreover, since each protrusion part 24c and the sine wave surface 8b contact | abut, a contact area becomes small mutually and it can aim at noise reduction. Furthermore, since the protrusion 24c is spherical, the contact area can be reduced as much as possible, and further noise reduction can be achieved.

  In addition, although it was set as the structure provided with two protrusion parts 24c, according to the magnitude | size of a vibration motor or the design of the frequency of a thrust direction, it can change suitably with the number of the peaks and troughs of the sine wave surface 8b of the bearing 8, for example. .

  FIG. 10 is a perspective view of another embodiment of the bearing. 11 is a side view showing a state in which the shaft sleeve 4 shown in FIG. 4 and the bearing 28 shown in FIG. 10 are in contact with each other.

  A surface 28b facing the shaft sleeve 4 in the contact portion 28a of the bearing 28 is formed in a flat shape. For example, two spherical protrusions 28c protrude from the flat surface 28b. As shown in FIG. 11, these protrusions 28 c are in contact with the sine wave surface 4 b in the contact portion 4 a of the shaft sleeve 4. The relationship between the height difference C of the peaks and valleys of the sine wavefront 4b and the height D of the protrusion 28c is preferably C ≦ D. This is because the rotation of the rotor 17 moves the tip of the protrusion 28c to a position where it abuts against the valley 4b-2 of the sine wave surface 4b so that the flat surface 28b and the peak 4b-1 of the sine wave surface 4b do not contact each other as much as possible. It is to do. Even with such a configuration of the bearing 28, the rotor 17 can be vibrated in the thrust direction by the rotation of the rotor 17. Moreover, since each projection 28c and the sine wave surface 4b are in contact with each other, the contact area is reduced and noise reduction can be achieved. Furthermore, since the protrusion 28c is spherical, the contact area can be reduced as much as possible, and further noise reduction can be achieved.

  In addition, although it was set as the structure provided with two projection parts 28c, according to the magnitude | size of a vibration motor and the design of the frequency of a thrust direction, it can change suitably with the number of the peaks and troughs of the sine wave surface 4b of the shaft sleeve 4. .

  FIG. 12 is a cross-sectional view showing a bearing according to still another embodiment. FIG. 13 is a plan view showing this bearing.

  For example, two spheres 38c are placed on the flat surface 38b facing the shaft sleeve 4 in the contact portion 38a of the bearing 38 with an interval of 180 °, and the sphere 38c is formed on the flat surface 38b, for example, a hemisphere. Are respectively rotatably accommodated in a concave portion 38d. The sphere 38c is made of metal, for example. In addition, the part shown with the code | symbol 38e is an axial hole through which the shaft 3 passes. According to such a configuration, when the rotor 17 rotates and the shaft sleeve 4 rotates, the sphere 38c freely rotates while contacting the sine wave surface 4b of the shaft sleeve 4. According to such a configuration of the bearing 38, the friction between the spherical body 38c and the sine wave surface 4b of the shaft sleeve 4 can be reduced, so that wear of the contact portion between them can be suppressed and further noise reduction can be achieved. it can.

  FIG. 14 is a side view showing a shaft sleeve and a bearing according to still another embodiment. In this example, the shaft sleeve 44 and the bearing 48 having the same configuration as the shaft sleeve 4 and the bearing 8 shown in FIGS. 4 and 5, respectively, and spherical protrusions 35 on the side of the shaft sleeve 44 are provided at intervals of 180 °, for example. Are provided on the two peaks 44a-1. Also with such a configuration, the area where the shaft sleeve 4 and the bearing 8 abut on each other can be reduced.

  In the embodiment shown in FIG. 14, the projection 35 may be a rotatable sphere as described above. It is also possible to adopt a configuration in which these protrusions 35 or a rotatable sphere (not shown) are provided on the bearing 48 side instead of the shaft sleeve 44 side.

  The present invention is not limited to the embodiment described above, and various modifications are possible.

  In each of the above embodiments, an example in which the weight 6 is attached to the rotor yoke 2 has been described. However, the configuration may be such that there is no weight 6 and the rotor 17 vibrates only in the thrust direction.

  For example, in FIG. 6, the shapes of the contact portion 4a of the shaft sleeve 4 and the contact portion 8a of the bearing 8 are sine wavefronts, but as shown in FIG. 15 or FIG. 16, they are formed in a triangular shape or a trapezoidal shape. You may do it.

  In the form shown in FIGS. 12 and 13, the bearing 38 is provided with a recess 38d and a sphere 38c. However, the reverse configuration may be used. That is, it is good also as a structure by which a recessed part is provided in the plane 24b of the shaft sleeve 24 shown in FIG. 8, and a spherical body is accommodated in this recessed part. In this case, the sphere may be provided in place of the protrusion 24c shown in FIG. Further, in this case, the bearings shown in FIGS. 4 and 5 are prepared as the bearings that contact the shaft sleeve.

It is a perspective view which shows the vibration motor which concerns on one embodiment of this invention. It is a disassembled perspective view of the vibration motor shown in FIG. It is sectional drawing of the vibration motor shown in FIG. It is the perspective view which showed the lower surface side of the shaft sleeve upward. It is a perspective view which shows a bearing. It is a figure which shows the shape of the sine wave front of a shaft sleeve and a bearing. It is a perspective view which shows the conventional cylindrical vibration motor. It is a perspective view of other embodiments of a shaft sleeve. It is a side view which shows the state which the shaft sleeve shown in FIG. 8 and the bearing shown in FIG. 5 contact | abutted. It is a perspective view of other embodiments of a bearing. It is a side view which shows the state which the shaft sleeve shown in FIG. 4 and the bearing shown in FIG. 10 contact | abutted. It is sectional drawing which shows the bearing which concerns on another embodiment. It is a top view of the bearing shown in FIG. It is a side view which shows the shaft sleeve and bearing which concern on another embodiment. It is a figure which shows the uneven | corrugated shape of a shaft sleeve and a bearing. It is a figure which shows the other uneven | corrugated shape of a shaft sleeve and a bearing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 ... Shaft 4, 24, 34, 44 ... Shaft sleeve 4b ... Sine wave front 6 ... Weight 7 ... Coil 8, 28, 38, 48 ... Bearing 8b ... Sine wave front 9 ... Magnet 10 ... Vibration motor 15 ... Stator 17 ... Rotor 24 ... Shaft sleeve 24a ... Contact part 24b ... Plane 24c, 28c, 35 ... Protrusion 28b, 38b ... Plane 28c ... Protrusion 38c ... Sphere 38d ... Recess

Claims (13)

A stator,
A rotor rotatable with respect to the stator;
A shaft serving as a rotation axis of the rotor;
A shaft support that supports the shaft and is capable of applying vibration in the axial direction of the shaft to the rotor;
A vibration motor comprising: a drive mechanism for rotationally driving the rotor. The vibration motor according to claim 1,
The shaft support is
A sleeve having a first wavefront provided to wave in the axial direction, provided on the rotor and to which the shaft is fixed;
A second wavefront provided so as to wave in the axial direction at substantially the same period as the first wavefront, the second wavefront being in contact with and facing the first wavefront; A vibration motor comprising: a supporting bearing. The vibration motor according to claim 1,
The shaft support is
A sleeve having a first wavefront provided to wave in the axial direction and a plurality of protrusions protruding from the first wavefront, the sleeve provided on the rotor and to which the shaft is fixed;
A second wavefront that is provided so as to wave in the axial direction at substantially the same period as the first wavefront, and that is opposed to the first wavefront and is in contact with the protrusions, and is provided on the stator. And a bearing that pivotally supports the shaft. The vibration motor according to claim 3,
Each of the protrusions is a part of a sphere. The vibration motor according to claim 3,
The sleeve is
A sphere that constitutes each of the protrusions;
A vibration motor, comprising: a concave portion provided on the plane and rotatably receiving the sphere. The vibration motor according to claim 1,
The shaft support is
A sleeve having a first wavefront provided to wave in the axial direction, provided on the rotor and to which the shaft is fixed;
A second wavefront opposed to the first wavefront provided to wave in the axial direction at substantially the same period as the first wavefront, and protruding from the second wavefront to the first wavefront. A vibration motor comprising: a plurality of projecting portions that come into contact with each other; and a bearing that is provided on the stator and supports the shaft. The vibration motor according to claim 6,
Each of the protrusions is a part of a sphere. The vibration motor according to claim 6,
The bearing is
A sphere that constitutes each of the protrusions;
A vibration motor, comprising: a concave portion provided on the plane and rotatably receiving the sphere. The vibration motor according to claim 1,
The shaft support is
A sleeve having a first concavo-convex surface protruding and depressed in the axial direction periodically in a rotational circumferential direction, provided on the rotor and having the shaft fixed thereto;
A second concavo-convex surface that is provided so as to be raised and depressed in the axial direction at substantially the same period as the first concavo-convex surface; And a bearing that pivotally supports the shaft. The vibration motor according to claim 1,
The shaft support is
A sleeve having a plane parallel to the rotational radial direction of the rotor and a plurality of protrusions protruding from the plane, the sleeve being provided on the rotor and having the shaft fixed thereto;
It has a wave surface provided so as to ripple in the axial direction while abutting each of the projecting portions facing the flat surface, and having a bearing provided on the stator and supporting the shaft. Vibration motor. The vibration motor according to claim 1,
The shaft support is
A sleeve having a wavefront provided to wave in the axial direction, provided on the rotor and to which the shaft is fixed;
A plane that faces the wavefront and is parallel to the rotational radial direction of the rotor, and a plurality of protrusions that protrude from the plane and come into contact with the wavefront, are provided on the stator and support the shaft A vibration motor comprising: a bearing. The vibration motor according to claim 1,
A vibration motor, further comprising a weight attached to the rotor and configured to vibrate the rotor in a radial direction of the rotor. A stator, a rotor rotatable with respect to the stator, a shaft serving as a rotation axis of the rotor, and a shaft support portion capable of supporting the shaft and applying vibration in the axial direction of the shaft to the rotor; A vibration motor having a drive mechanism for rotationally driving the rotor;
An electronic device comprising: a housing incorporating the vibration motor.

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