JP2013103142A - Vibration device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration device suitable for reducing thickness, obtainable of large excitation force, and further effectively converting the power for driving to the vibration.SOLUTION: The vibration device includes: a moving member 120 supported by a shaft pin 107 to a case body 101, capable of circular movement reciprocating around the shaft pin 107, and having a plurality of magnetic poles NSN arranged in line in a circumferential direction around a rotary shaft; and coils 104 and 105 facing the moving member 120 with a gap. When the direction of the current flowing to the coils 104 and 105 is switched, the moving member 120 performs circular movement reciprocating around the shaft pin 107.

Description

  The present invention relates to a vibration device that generates mechanical vibration.

  Various types of vibration devices are known as devices for realizing a manner mode or the like of a cellular phone that notifies an incoming call by vibration. In particular, as a device to be mounted (for example, a mobile phone) is made thinner, a thinner vibration device is required. 2. Description of the Related Art As a vibration device suitable for a reduction in thickness, a device in which a movable element (vibrator) reciprocates like a pendulum is known. For example, Patent Literature 1 includes a mover magnetized on the outer periphery, and a plurality of stator-side salient poles provided at positions spaced from the outer peripheral surface of the mover. A configuration is described in which the polarity of the salient pole is switched to cause the mover to perform a pendulum motion about the axis, thereby generating vibration. In Patent Documents 2 and 3, a linear reciprocating motion is possible and the front and back of a magnetized mover are supported by a spring, and a current is passed through a coil disposed on a plane parallel to the movement direction of the mover. A configuration is described in which a Lorentz force is applied between the mover and the coil, and the mover is reciprocated back and forth on a straight line by the reaction force.

JP 2001-352742 A JP 2010-099642 A Chinese Patent No. 1014888697B

  In the structure described in Patent Document 1, vibration is generated by using magnetic attraction and repulsive force acting between the magnet on the mover side and the salient pole on the stator side. In this structure, since the inductance is large, there is a problem that the vibration frequency of the left-right swinging mover cannot be increased and it is difficult to adjust the vibration frequency for resonating. In addition, since a structure in which a coil is wound around a salient pole is required, there is a limit to downsizing and thinning.

  In the structures described in Patent Documents 2 and 3, the front and rear of the movable element that reciprocates on a straight line are supported by a spring. The elastic force generated from the spring is not limited to the movable element after the movable element exceeds the center point. It is the opposite of the forward direction, and tries to prevent movement. For this reason, the maximum speed of the mover is limited by this spring, and the excitation force cannot be increased. That is, when vibration is generated by the reciprocating motion of an object on a straight line, the speed at the time of reversing the direction of movement is as large as possible, and the time required for the reversal is as short as possible. However, in the structure in which the movable element is supported by the spring from the front and rear in the moving direction, the repulsive force and the attractive force of the spring become stronger and the speed of the movable element decreases as it goes to the end of the reciprocating motion. Further, since the moving direction is gently reversed by the spring, the time required for changing the direction of the mover inevitably increases. For this reason, the holding spring works to suppress the excitation force, the excitation force is weak, and the vibration generation efficiency is low. To reduce this problem, the spring can be weakened, but in order to strengthen the magnetic field and prevent magnetic flux leakage, a magnetic material such as a case or back yoke is installed on the bottom of the coil. There is a problem that the mover comes into contact with the stator by losing the magnetic force attracted to the coil side. For this reason, the spring that supports the mover must be strong to some extent. However, if it does so, the effect | action which suppresses the vibration by a spring will become apparent as mentioned above. Further, in the structures described in Patent Documents 2 and 3, a gap between the mover and the coil is secured in order to weaken the spring supporting the mover and to avoid contact between the mover and the stator side coil. Although a structure to be considered is conceivable, this secured gap becomes an obstacle to thinning. Further, if the spring supporting the mover is weakened, the structure becomes weak and the reliability is lowered.

  In such a background, an object of the present invention is to provide a vibration device that is suitable for thinning, can obtain a large excitation force, and generates vibration more efficiently.

  The invention according to claim 1 is capable of circular motion reciprocating with respect to the bottom plate and the bottom plate, provided with a center of gravity at a position deviated from the center of the rotational axis of the circular motion, and provided with a plurality of magnetic poles. The reciprocating circular motion of the mover is caused by a Lorentz force acting between a mover, a coil fixed to the bottom plate, a magnetic field generated by the magnetic poles of the mover and a current flowing through the coil. Means for switching the direction of the reciprocating circular movement of the mover by switching the direction of the current generated and flowing in the coil, and the mover performs a reciprocating circular movement around the rotation axis. It is a vibration device characterized by this.

  Here, the rotation axis is the center of rotation of the rotating object. The reciprocating circular motion refers to a reciprocating motion along the arc around the center of curvature of the arc.

  According to the first aspect of the present invention, the mover performs a circular motion around the rotation axis by the electromagnetic force from the energized coil, and the energization direction is reversed, so that the reverse direction generated from the coil. Performs a circular motion in the opposite direction by the electromagnetic force applied to And the reciprocating circular motion is performed by repeatedly switching the energization to the coil. Vibration is generated by the reciprocating circular motion of the mover. The period of the circular movement of the mover, that is, the vibration frequency of the vibration device can be adjusted by changing the movable angle range of the mover. For example, if the natural vibration frequency of a device such as a mobile phone is known, the movable angle range of the mover can be adjusted so that resonance occurs during vibration and a stronger vibration can be generated. During movement, the movement of the mover is mainly controlled by the frictional resistance of the bearing that holds the mover in a rotatable state, and there is a force that suppresses vibration in proportion to the amplitude. do not do. For this reason, the mover is always accelerated in the movable angle range, the speed (rotational speed) of the mover at the most shaken position can be increased, and a large excitation force can be obtained. Further, as described above, since there is no force for suppressing the vibration, the ratio of the input energy (input power) required for driving to be consumed other than the vibration is small, and the vibration can be generated efficiently.

  In the first aspect of the present invention, when a current flows through the coil fixed to the bottom plate side, a Lorentz force acts between this current and the magnetic flux generated by the magnetic pole on the mover side. Since the coil is fixed to the bottom plate, the reaction force of this Lorentz force is applied to the mover, and the above-described rotation of the mover occurs. The reciprocating circular motion of the mover occurs by repeatedly switching the direction of the current flowing through the coil.

  In the first aspect of the present invention, the bottom plate may include a magnetic material, and a magnetic path of magnetic flux generated by the magnetic poles of the mover may be formed on the bottom plate. As such a bottom plate, the bottom plate itself is made of a magnetic material (for example, various magnetic steel plates such as SPCC steel plate), or the plate-like portion that is the base of the bottom plate is made of a non-magnetic material such as a resin, Examples thereof include a structure in which a magnetic material such as nickel is coated on the surface, and a structure in which a magnetic material is coated on the surface of a non-magnetic stainless steel plate.

  The bottom plate also functions as a magnetic shield that suppresses leakage magnetic flux from the vibration device to the outside. For example, when a vibration device using the present invention is built in a mobile phone, there is a high possibility that a high-frequency circuit or a digital circuit will be arranged in the vicinity. However, if the leakage magnetic flux from the vibration device is large, those due to the leakage magnetic flux There are concerns about adverse effects on the circuit. By configuring the bottom plate with a material including a magnetic material, the leakage flux is suppressed by the bottom plate, and the problem of adverse effects of the leakage flux on other circuits is suppressed.

  The invention according to claim 1, wherein the mover has a plate-like structure, and is formed of a magnetic material on a side of the mover opposite to the face facing the coil, and the plurality of magnetic poles A structure in which a back yoke portion functioning as a back yoke is disposed is also preferable. By providing the back yoke portion, the magnetic pole of the mover can efficiently generate magnetic flux, and leakage of the magnetic flux generated by the magnetic pole to the outside can be suppressed.

  As a structure of the back yoke portion, a structure in which a magnetic plate is attached behind the magnetic pole of the mover can be mentioned. Further, a magnetic material plate functioning as a back yoke portion may be disposed at a position spaced from the mover. In this case, the back yoke portion is structured away from the mover, but functions as a back yoke that forms a magnetic path behind the magnetic pole.

  According to a second aspect of the present invention, in the first aspect of the present invention, a stopper for limiting a movable range of the movable element is fixed to the bottom plate.

  According to the second aspect of the present invention, an impact is applied to the stopper with which the movable element contacts, and at the same time, a repulsive force is received from the stopper, and the direction of movement of the movable element is reversed at that time. By repeating this movement, the reciprocating circular movement of the mover is performed. Further, when the movable element that performs the reciprocating circular motion repeatedly collides with the stopper, the impact is repeatedly generated, and the vibration of the vibration device is generated. When an elastic material is used as the stopper, it is possible to suppress an impact sound when the mover contacts the stopper. In addition, if a material that can be regarded as a rigid body instead of an elastic body (for example, steel) is used as the stopper, the energy of vibration absorbed at the time of impact can be suppressed, and the impact sound and impact sensation that occur periodically during vibration can be obtained. it can.

  According to a third aspect of the present invention, in the first or second aspect of the invention, there is provided means for detecting an angular position of the mover, and switching of the polarity of energization to the coil based on the detected angular position. Is performed.

  According to the third aspect of the present invention, the detection means detects that the mover has reached the end of the reciprocating motion, or has reached the angular position at the timing of switching the movement direction. The polarity (direction) of the current flowing through the coil is switched, and the moving direction of the mover is reversed. Thereby, the reciprocating motion of the mover is continuously performed. The detection means for detecting the position of the mover includes sensorless control that detects the position of the mover by a change in inductance, a Hall element that magnetically detects the position of the mover, and contact with the mover. And a mechanical switch that detects contact of the movable element to the stopper, a structure that detects the position of the movable element optically or magnetically, and a combination of these.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the shaft includes a shaft fixed to the bottom plate, and the movable element can reciprocate around the shaft. It is characterized by being.

  According to a fifth aspect of the present invention, in the invention according to the fourth aspect, the mover is formed with a housing region that houses at least a part of a bearing that holds the shaft, and the housing region includes the housing. In a state in which at least a part is accommodated, the movable element is capable of reciprocating circular movement around the axis. According to the fifth aspect of the present invention, since at least a part of the bearing is accommodated in the accommodating region, the space occupied by the bearing in the direction in which the shaft extends can be saved, and the vibration device can be thinned. Here, the bearing includes a rolling bearing, a sliding bearing, and a part of members constituting these bearings. This is the same in the inventions of claims 6 and below.

  The invention according to claim 6 is the invention according to any one of claims 1 to 3, further comprising: a shaft fixed to the mover; and a top plate disposed to face the bottom plate. The bottom plate is formed with a first housing region that houses at least a portion of the first bearing that holds the shaft, and the top plate has at least one second bearing that holds the shaft. A second housing area is formed for housing the portion, at least a part of the first bearing is housed in the first housing area, and at least one of the second bearings is housed in the second housing area. In the state in which the portion is accommodated, the movable element is capable of reciprocating circular movement around the axis.

  According to the sixth aspect of the present invention, since the receiving area for receiving the bearing is provided in each of the bottom plate and the top plate that are arranged face to face, the space occupied by the bearing is saved, and the vibration device can be made thinner. .

  The invention according to claim 7 is the invention according to any one of claims 1 to 3, further comprising a top plate disposed facing the bottom plate, and contacting the bottom plate and the mover. And a bearing ball that rolls in a circumferential direction around the rotation axis with respect to the bottom plate and the mover, and holds a load in a thrust direction, and contacts the top plate and the mover; and A bearing ball that rolls in a circumferential direction around the rotation axis with respect to the top plate and the mover and holds a load in a thrust direction, and the mover is between the bottom plate and the top plate, It is characterized by being held in a state where reciprocating circular motion is possible.

  Here, the direction of the circumference is used to mean the direction in which the curve constituting the circumference extends. According to the seventh aspect of the present invention, the mover is held between the bottom plate and the top plate by the bearing ball in a state in which the mover can reciprocate around the rotation axis. In this configuration, the bearing balls are in contact with the mover and the bottom plate, and are also in contact with the mover and the top plate, so that the number of parts can be reduced and the thickness can be reduced. Here, the bearing ball may be a spherical bearing ball, but is not necessarily limited to a spherical shape as long as it can roll along a circumferential direction around the rotation axis.

  ADVANTAGE OF THE INVENTION According to this invention, the vibration apparatus which is suitable for thickness reduction, a big excitation force is obtained, and a vibration generate | occur | produces more efficiently is provided.

It is a disassembled perspective view of embodiment. It is a perspective view of the needle | mover in embodiment. It is a perspective view for demonstrating operation | movement of embodiment. It is a principle figure for demonstrating operation | movement of embodiment. It is a conceptual diagram (A) and (B) explaining the direction of Lorentz force. It is a block diagram which shows the structure of a control system. It is a disassembled perspective view of embodiment. It is a top view of an embodiment. It is a block diagram which shows the structure of a control system. It is a disassembled perspective view of embodiment. It is the perspective view (A), side view (B), and top view (C) of embodiment. It is a disassembled perspective view of embodiment. It is the top view (A) and perspective view (B) of an embodiment. It is the top view (A) and perspective view (B) of an embodiment. It is a perspective view of an embodiment. It is the side view (A), top view (B), and perspective view (C) of an embodiment. It is a perspective view of the needle | mover of embodiment. It is a sectional side view of an embodiment. It is a top view (A) of an embodiment, a side sectional view (B), and a perspective view (C) of a case body.

1. First embodiment (structure)
FIG. 1 shows a state where the vibration device 100 of the embodiment is disassembled. The vibration device 100 includes a case main body 101 made of a magnetic steel material. The case main body 101 is a portion that becomes a casing (casing) of the vibration device 100. The case main body 101 has a thin box-like structure with an open upper surface, and includes a side plate 102 surrounding the periphery and a bottom plate 103 that covers the bottom portion of the portion surrounded by the side plate 102. . Coils 104 and 105 are fixed on the bottom plate 103.

  The coil 104 has a substantially triangular shape when viewed from the direction perpendicular to the bottom plate 103, and a first extension portion 104 a and a second extension extending along a direction away from the rotation axis (center of the shaft pin 107). The outer portion 104b, the outer peripheral portion 104c along the circumferential direction around the rotation axis connecting the first extending portion 104a and the second extending portion 104b on the outer peripheral side, the first extending portion 104a and the first extending portion 104b It has an inner peripheral portion 104d that connects the two extending portions 104b on the inner peripheral side. The coil 105 has the same shape as that of the coil 104, and the first extension part 105a and the second extension part 105b extending along the direction away from the rotation axis, the first extension part 105a and the second extension part. An outer peripheral portion 105c along the circumferential direction connecting the extending portions 105b on the outer peripheral side, and an inner peripheral portion 105d connecting the first extending portion 105a and the second extending portion 105b on the inner peripheral side. ing. Both coils 104 and 105 have a structure in which a wire is wound a plurality of times. Here, the outer peripheral portions 104c and 105c are longer in the circumferential direction than the inner peripheral portions 104d and 105d. The coils 104 and 105 can also be configured using printed wiring.

  A fixing pin 106 and a shaft pin 107 are fixed to the bottom plate 103. A stopper member 108 is attached to the fixing pin 106. The stopper member 108 has a pair of stopper portions 109 and 110. The stopper portions 109 and 110 are formed by processing a metal leaf spring and have spring properties (elasticity). It is also possible to change the stopper portions 109 and 110 to a material that can be regarded as a rigid body.

  The shaft pin 107 is an example of a shaft that is disposed at a position that serves as a rotation shaft of the mover 120 described later, and a ball bearing 111 that is an example of a bearing is attached to the shaft pin 107. Although details are omitted in the drawing, the ball bearing 111 has an inner ring and an outer ring that is rotatable relative to the inner ring, and the shaft pin 107 is fixed inside the inner ring. Yes. A mover 120 is fixed to the outer ring of the ball bearing 111. With this structure, the mover 120 is held with respect to the case main body 101 in a state where the mover 120 can rotate around the shaft pin 107. Note that a sliding bearing may be employed instead of the ball bearing 111.

  A top plate 130 is attached to an open portion of the upper portion of the case main body 101 using the shaft pin 107 and the fixing pin 106. The top plate 130 is a plate-like member made of a steel material that is a magnetic material that serves as a lid. The top plate 130 is integrated with the case main body 101 to form a casing (casing) of the case main body 101. The top plate 130 is provided with pin fixing holes 131 and 132, and the shaft pin 107 is fitted into the pin fixing hole 131 and the fixing pin 106 is fitted into the pin fixing hole 132, so that the case main body 101 of the top plate 130 is fitted. Is fixed.

  The mover 120 is a member that functions as a vibrator, is made of a nonmagnetic metal material, and has a substantially fan-shaped substantially plate shape. As described above, the mover 120 is held by the ball bearing 111 in a freely rotatable state on the shaft pin 107. The shaft pin 107 is at a position that serves as the rotation axis of the mover 120 and is at the position of a substantially fan-shaped apex in the mover 120. The center of gravity of the mover 120 is located at a position shifted from the shaft pin 107 in the direction of the protrusion 126. The position of the apex of the substantially sector shape is defined as the position of the center of curvature of the arc that forms the sector shape. Further, the movable element 120 has a gap between the coils 104 and 105 so as not to contact the coils 104 and 105, and the gap between the top 120 and the top plate 130 so as not to contact the top board 130. It is held in the position it had.

  FIG. 2 shows the mover 120 with the back side of the surface shown in FIG. 1 visible. A shaft hole 121, which is an example of a housing region that houses at least a part of the bearing, is provided at a position that serves as a rotation shaft of the mover 120, and an outer ring of the ball bearing 111 is fixed to the shaft hole 121. The ball bearing 111 may be configured to be completely accommodated in the shaft hole 121, or may be configured to be partially accommodated in the shaft hole 121. Magnets 122, 123, and 124 in which the polarities are alternately reversed are attached to the mover 120 along the circumferential direction around the rotation axis. The magnets 122, 123, and 124 are thin permanent magnets magnetized in the front and back directions, and constitute a magnetic pole on the mover 120 side.

  As shown in the drawing, the polarity of the magnet 122 and the adjacent magnet 123 are reversed, and the polarity of the magnet 123 and the adjacent magnet 124 is reversed. The mover 120 is formed with openings for fitting the magnets 122 to 124, and the magnets 122, 123, and 124 are fitted therein and fixed. The magnetic pole surfaces of the magnets 122, 123, and 124, that is, the south pole surface of the magnet 122, the north pole surface of the magnet 123, and the south pole surface of the magnet 124 can face the annular coils 104 and 105, respectively. It is said that.

  Moreover, the needle | mover 120 is dug down in the part of the code | symbol 125, and thickness is thin. The coils 104 and 105 are accommodated in a state where the coils 104 and 105 are not in contact with the mover 120 in the dug portion indicated by the reference numeral 125. By doing so, the thickness is further reduced.

  A protrusion 126 protruding in a direction away from the rotation shaft (the position of the shaft pin 107) is provided at the tip of the mover 120. When the protrusion 126 comes into contact with the stopper 109, the rotation of the mover 120 in the clockwise direction as viewed from the viewpoint of FIG. 1 is limited, and when the protrusion 126 comes into contact with the stopper 110, FIG. The counterclockwise rotation of the mover 120 viewed from the viewpoint is limited. In other words, the protrusion 126 can move between the stoppers 109 and 110, and in that range, the movable element 120 moves the reciprocating circular motion around the position of the shaft pin 107, that is, the shaft pin 107. As a center, it is possible to move back and forth on an arc whose center is the curvature. The contact between the protrusion 126 and the stoppers 109 and 110 is set within a range where a driving force to the mover 120 by a Lorentz force described later effectively acts.

  In the structure shown in FIG. 1, the bottom plate 103 made of a magnetic material functions as a yoke in which a magnetic path of magnetic flux generated by the magnets 122, 123, and 124 constituting the magnetic pole on the movable element 120 side is formed. The bottom plate 103 also functions as a magnetic shield that prevents the magnetic fluxes generated by the magnets 122 to 124 and the magnetic fluxes generated by the coils 104 and 105 from leaking outside the vibration device 100. The top plate 130 is made of a steel material that is a magnetic material, and functions as a magnetic shield similar to the back yoke of the magnets 122, 123, and 124 attached to the mover 120 and the bottom plate 103.

  The structure that supports the mover 120 in a rotatable state is not limited to the illustrated structure, that is, the structure in which the shaft side is fixed and the mover 120 is attached to the shaft in a freely rotatable state, and the shaft is fixed to the mover 120. The shaft may be attached to the case main body 101 in a freely rotatable manner by a bearing.

(Operating principle)
FIG. 3 is a perspective view for explaining the principle of operation. FIG. 3 shows a state where the top plate 130, the mover 120, and the ball bearing 111 are removed from the vibration device 100 of FIG. In FIG. 3, the XY plane is the surface of the bottom plate 103, and the Z direction is the extending direction of the shaft pin 107. Further, the X direction is made to coincide with the direction from the shaft pin 107 to the fixed pin 106. FIG. 4 conceptually shows cross-sectional portions of the coils 104 and 105 at the viewpoint viewed in the X direction in FIG. 4 is developed in a circumferential direction 140 (see FIG. 3) centering on the shaft pin 107.

  FIG. 5A conceptually shows the Lorentz force acting on the current in a magnetic field known by Fleming's left-hand rule. FIG. 5B is obtained by reversing the direction of current flow and the direction of magnetic flux in FIG.

  First, consider the state shown in FIG. In this state, a magnetic path 141 between the magnets 122 and 123 and a magnetic path 142 between the magnets 123 and 124 are formed on the bottom plate 103, and a magnetic path 143 and a magnet 123 between the magnets 122 and 123 are formed on the top plate 130. , 124 is formed. Here, it is assumed that a current flows through the coils 104 and 105 in the state shown in FIG.

  In this situation, the second extending portion 104b portion of the coil 104 and the first extending portion 105a portion of the coil 105 have Lorentz in the leftward direction of the drawing based on the relationship shown in FIG. A force 145 acts. Further, the portion of the first extension portion 104a of the coil 104 and the portion of the second extension portion 105b of the coil 105 are directed to the left in the same figure as the above case from the relationship shown in FIG. A Lorentz force 145 in the direction acts.

  Here, since the coils 104 and 105 are fixed to the bottom plate 103, a reaction force 146 of the Lorentz force 145 acts on the magnets 122, 123, and 124 that can move with respect to the bottom plate 103. Due to the reaction force 146 of the Lorentz force, the mover 120 moves (rotates) in the right direction in FIG. 4, that is, in the clockwise direction in FIG. As shown in FIG. 1, the mover 120 includes a protrusion 126, and when the protrusion 126 comes into contact with the stopper 109, the mover 120 moves in the right direction in FIG. 4 (clockwise direction in FIG. 3). (Rotation) is not possible. When the direction of the current flowing through the coils 104 and 105 is reversed at this timing (or immediately before that), the direction of the current is reversed from that in the case of FIG. 4, and the Lorentz force 145 and A reaction force 146 of Lorentz force acts. As a result, a force that moves the mover 120 in the left direction in FIG. 4 (counterclockwise direction in FIG. 3) acts on the mover 120 and moves (rotates) in that direction.

  When the direction of the current flowing through the coils 104 and 105 is reversed again at the timing when the protrusion 126 reaches the stopper 110, the same Lorentz force as in FIG. 4 acts, and the right direction in FIG. 3 in the clockwise direction 3). In this way, by reversing the direction of the current flowing through the coils 104 and 105 at an appropriate timing, the mover 120 performs a circular motion reciprocating between the stopper portions 109 and 110 with the shaft pin 107 portion as the center of rotation. Repeatedly, vibration occurs. Here, if the distance between the stopper portions 109 and 110 is adjusted, the cycle of the reciprocating motion of the mover can be adjusted. If the natural vibration frequency of the mounted device such as a mobile phone is known, the mounted device can be resonated by adjusting the angular distance between the stopper portions 109 and 110.

  The Lorentz force also acts on the outer peripheral portions 104c and 105c and the inner peripheral portions 104d and 105d, but since the direction is the radial direction, the Lorentz force is centered on the shaft pin 107 of the mover 120 described above. Does not contribute to vibration.

(Control part)
FIG. 6 is a block diagram of a control unit for causing the mover 120 to generate the reciprocating circular motion (vibration). Although not shown in FIGS. 1, 3, and 4, the hall sensor 151 shown in FIG. 6 is disposed inside the coil 104 in the vibration device 100, and the hall sensor 152 is located inside the coil 105. Has been placed. Further, a control unit 153 shown in FIG. 6 is disposed as an external circuit outside the vibration device 100. The control unit 153 has a microcomputer function and a function of flowing a drive current through the coils 104 and 105.

  When the mover 120 rotates around the shaft pin 107, the relative positional relationship between the hall sensors 151 and 152 and the magnets 122 to 124 changes, and the outputs of the hall sensors 151 and 152 change. The relationship between the outputs from the hall sensors 151 and 152 and the position of the mover 120 is examined in advance, and the information is stored in a memory provided in the mover position detection unit 154 of the control unit 153. The mover position detection unit 154 detects the angular position of the mover 120 based on the outputs of the hall sensors 151 and 152, and the mover position detection unit 154 detects which angle position of the mover 120 based on the detected angular position. Whether to reverse the polarity of the drive current flowing through the coils 104 and 105 at the timing is determined, a polarity switching signal for controlling the switching of the polarity is generated, and is output to the drive current switching unit 155. The relationship between the outputs of the Hall sensors 151 and 152 and the timing for switching the polarity is selected based on the result of a preliminary experiment conducted in advance, and is stored in the memory provided in the mover position detector 154. Yes.

  The drive current switching unit 155 inverts the polarity of the drive current supplied to the coils 104 and 105 based on the polarity switching signal output from the mover position detection unit 154. By reversing the polarity periodically, the reciprocating rotational movement of the mover 120, that is, the left rotation → right rotation → left rotation → right rotation →... And vibration occurs.

(Superiority)
As described above, the vibration device 100 shown in FIG. 1 and FIG. 2 is supported by the shaft pin 107 with respect to the case body 101, and can reciprocate around the shaft pin 107. A mover 120 having a plurality of magnetic poles N, magnetic poles S, and magnetic poles N arranged in a circumferential direction around the shaft pin 107 so as to have different polarities is provided. In addition, the vibration device 100 includes coils 104 and 105 that face the mover 120 with a gap. Here, by switching the direction of the current flowing through the coils 104 and 105, the mover 120 performs a reciprocating circular motion around the shaft pin 107.

  According to this structure, the mover 120 is supported by the shaft pin 107, and the mover 120 performs a circular motion reciprocating around the shaft pin 107 to generate mechanical vibration. At this time, in a state where the movable element 120 is not in contact with the stopper portion 109 or 110, the movement of the movable element 120 is regulated by a ball bearing that holds the movable element 120 while being rotatable with respect to the shaft pin 107. The friction resistance of the 111 part is the main, and there is no force that suppresses vibration in proportion to the amplitude. For this reason, the mover 120 is always accelerated in the movable angle range, and the position of the most shaken position, that is, the speed (rotational speed) of the mover when contacting the stopper portion can be increased, and a large excitation force can be obtained. Further, as described above, since there is no force for suppressing the vibration, the ratio of the input energy (input power) required for driving to be consumed other than the vibration is small, and the vibration can be generated efficiently.

2. Second Embodiment FIG. 7 shows a vibration device 200. In the vibration device 200, the back yoke 150 is attached in contact with the upper surfaces of the magnets 122, 123, and 124 (the surface opposite to the surface facing the coils 104 and 105). The back yoke 150 is a thin plate made of a magnetic material. By attaching the back yoke 150, the air gap between the mover 120 and the top plate 130 is eliminated, the magnetic resistance of the magnetic circuit is reduced, the magnetic flux density penetrating the coil is increased, and the Lorentz force is increased. In addition, the inertial mass of the mover 120 increases and the moment of inertia increases, which is advantageous in generating strong vibration.

3. Third Embodiment Hereinafter, an example of a configuration using a stopper as a switch as means for detecting the position of the mover will be described. This example can also be grasped as an example of a configuration in which the direction of the current flowing through the coil is reversed when the mover collides with the stopper. FIG. 8 shows the vibration device 200 viewed from a direction perpendicular to the bottom plate 103. FIG. 8 shows a state in which the top plate 130 of FIG. 7 is removed. The vibration device 200 has a structure in which a mechanism for detecting a collision (contact) of the protrusion 126 of the mover 120 is incorporated in the stopper member 108 in the vibration device 100 of FIG. Except for the structure of this part and the configuration related to drive control, the vibration device 200 and the vibration device 100 are the same. Hereinafter, parts of the vibration device 200 different from the vibration device 100 will be described.

  The stopper member 108 of the vibration device 200 shown in FIG. 8 includes switches 161 and 164. The switch 161 has a structure in which an electrically conductive contact terminal 163 is disposed on an electrically insulating pedestal 162 and has a structure in which the stopper portion 109 is used as an electrode that can contact the contact terminal 163. . The switch 164 has a structure in which an electrically conductive contact terminal 166 is disposed on an electrically insulating pedestal 165, and has a structure in which the stopper portion 110 is used as an electrode that can contact the contact terminal 166. . Here, the stopper portions 109 and 110 are made of plated spring steel and are electrically connected to the case main body 101. The case body 101 is set to the system ground potential.

  In the state of FIG. 8, that is, in the state where the protrusion 126 is not in contact with the stopper 109 and the stopper 110, the contact terminal 163 and the back side of the stopper 109 are not in contact, and the contact terminal 166 and the stopper 110 is not in contact with the back side.

  FIG. 9 shows an electrical configuration. A bias voltage (+ V) is applied to the contact terminal 163 via the detection resistor 171, and a bias voltage (+ V) is applied to the contact terminal 166 via the detection resistor 172. When the contact terminal 163 comes into contact with the stopper portion 109, a current flows through the detection resistor 171, and a voltage generated at both ends of the detection resistor 171 is detected by the voltage detector 173. When the contact terminal 166 contacts the stopper portion 110, a current flows through the detection resistor 172, and a voltage generated at both ends of the detection resistor 172 is detected by the voltage detector 174. The mover position detector 154 detects the contact of the protrusion 126 with the stopper 109 or 110 based on the voltage detection signals output from the voltage detectors 173 and 174, and thereby determines the angular position of the mover 120. To detect. Other functions of the control unit 153 are the same as those in FIG.

  For example, when the mover 120 rotates (swings) in the clockwise direction in FIG. 8 and the protrusion 126 comes into contact with the stopper 109, the stopper 109 is pushed toward the contact terminal 163 by its own elasticity and deformed. The stopper portion 109 and the contact terminal 163 are electrically connected. This conduction is detected by the mover position detector 154 via the voltage detector 173. As a result, a state in which the movable element 120 is in an angular position where it comes into contact with the stopper portion 109 is detected. In response to this detection, the drive current switching unit 155 switches the polarity of the drive current to the coils 104 and 105. Then, by switching the drive current, the mover 120 reverses the direction of movement in the direction of the stopper portion 110.

  The examples shown in FIGS. 8 and 9 described above use a stopper using a leaf spring as a switch for switching the direction of the current flowing through the coil. The contact of the movable element to the leaf spring is detected by the electrical contact between the leaf spring and the contact terminal caused by the deformation of the leaf spring. This structure requires a small number of parts, has a simple structure, and can be obtained at low cost.

  As a means for switching the moving direction (rotation direction) of the mover 120, an acceleration sensor or a piezoelectric sensor that detects an impact of the mover colliding with the stopper is used in addition to the configuration using the magnetic sensor or the mechanical switch described above. And a change in the value of the current flowing through one or both of the coils 104 and 105 and using the change.

4). Fourth Embodiment FIG. 10 and FIG. 11 show a vibration device 300. FIG. 11 shows a state where the top plate 130 is removed. In the vibration device 300, the same reference numerals as those of the vibration device 100 illustrated in FIG. Hereinafter, parts of the vibration device 300 different from the vibration device 100 will be described. The vibration device 300 is different from the vibration device 100 of FIG. 1 in the structure of the bearing portion of the mover 120.

  A cylindrical spacer 302 is fixed to the bottom plate 103 of the vibration device 300. The spacer 302 is provided with a reduced diameter portion 302 a at an upper portion thereof, and the portion fits into a spacer fixing hole 311 provided in the top plate 130. An annular groove 301 centering on the rotation axis of the mover 120 is provided in a portion of the bottom plate 103 around the spacer 302. The annular groove 301 has a structure in which the bottom plate 103 is recessed outward in an annular shape. FIG. 11B shows a bulge 301 ′ of the bottom plate 103 generated by providing the annular groove 301. A flat annular retainer 303 is attached to the spacer 302 in a loosely fitted state. The retainer 303 is provided with a plurality of elongated holes 304 extending in the circumferential direction around the rotation axis along the circumferential direction. In each of the long holes 304, a bearing ball 305 is accommodated so as to roll freely. In a state where the bearing ball 305 is held by the retainer 303, the bearing ball 305 contacts the annular groove 301 and rolls there. Further, an annular groove (not shown) similar to the annular groove 306 is formed on the portion of the mover 120 where the bearing ball 305 abuts, and the bearing ball 305 contacts the annular groove, It is housed in a rollable state.

  Around the shaft hole 121 of the mover 120, an annular groove 306 is formed around the rotation axis. Each of the plurality of bearing balls 309 comes into contact with the annular groove 306, and is accommodated in a state where it can roll freely. The plurality of bearing balls 309 are held by the retainer 307 in a rotatable state. The retainer 307 is mounted in a state where it is loosely fitted into the spacer 302. The retainer 307 is provided with a plurality of elongated holes 308 extending in the circumferential direction around the rotation axis along the circumferential direction. Each of the plurality of bearing balls 309 is accommodated in each of the long holes 308 in a freely rollable state. The bearing ball 309 is in contact with the top plate 130 in a state where it can freely roll in an annular groove provided on the back surface side of the portion 310 of the top plate 130. Further, the diameter of the shaft hole 121 of the movable element 120 is larger than the diameter of the spacer 302, and the inner periphery of the shaft hole 121 does not contact the spacer 302.

  In this structure, the load in the thrust direction is held by the bearing balls 305 and 309. Thus, a structure is realized in which the reciprocating circular motion (vibration) of the mover 120 around the position of the spacer 302 is allowed.

  Here, an annular groove (not shown) provided on the lower surface side of the annular groove 301, the long hole 304, and the mover 120 extends along a circumference centered on the spacer 302. An annular groove provided on the back side of the annular groove 306, the long hole 308, and the portion denoted by reference numeral 310 also extends along the circumference centered on the spacer 302. According to this structure, the rolling of the bearing ball 305 is restricted by the annular groove 301, the long hole 304, and the annular groove (not shown) on the movable element 120 side, and the bearing ball 305 extends in the circumferential direction around the spacer 302. Only its rolling is allowed. Similarly, the rolling of the bearing ball 309 is restricted by the annular groove provided on the back surface side of the annular groove 306, the long hole 308, and the reference numeral 310, and the circumferential direction around the spacer 302 Only rolling is allowed. Due to the constrained state of the bearing balls 305 and 309, the mover 120 is held with respect to the bottom plate 103 and the top plate 130 in a state in which a reciprocating circular motion with the center position of the spacer 302 as the center of rotation is possible.

  In the structure shown in FIGS. 10 and 11, since the bearing balls are received by the bottom plate 103 and the top plate 130, the overall thickness can be further reduced, and the number of parts can be reduced. Instead of an annular groove 306 and an annular groove (not shown) formed on the surface opposite to the annular groove 306, a plurality of long grooves, that is, grooves extending along the circumference around the spacer 302 are provided. A structure in which a plurality of bearing balls 305 and 309 are received along the circumference is also possible.

5. Fifth Embodiment FIG. 12 shows a vibration device 400. In the vibration device 400, the same reference numerals as those of the vibration device 100 illustrated in FIG. 1 are the same as those of the vibration device 100. Hereinafter, parts of the vibration device 400 different from the vibration device 100 will be described. The vibration device 400 is different from the vibration device 100 of FIG. 1 in that the mover includes two magnets and the case body (stator) includes one coil.

  In the vibration device 400, the coil 401 is fixed on the bottom plate 103. The shape of the coil 401 is substantially the same as the coils 104 and 105 of FIG. 1, but the dimensions in the circumferential direction are larger than those of the coils 104 and 105. Thin magnets 404 and 405 are fitted and fixed to the mover 120. The magnets 404 and 405 are magnetized in a state where the polarities are reversed on the front and back so that the polarities of adjacent magnetic poles are reversed in the circumferential direction.

  In this example, the mover 120 does not include a protrusion. Stopper members 402 and 403 are fixed to a portion of the side plate 102 of the case body 101 that can face the side portion of the mover 120. The stopper members 402 and 403 are obtained by processing a leaf spring. When the rotating movable element 120 collides, the stopper members 402 and 403 rebound in the reverse direction. In this example, the stopper members 402 and 403 constitute a stopper that limits the movable range of the mover 120.

  The principle of operation is the same as that of the vibration device 100 of FIG. Since the vibration device 400 shown in FIG. 12 has a small number of magnets and coils, the size and cost can be further reduced. In addition, it is advantageous in terms of miniaturization that the position of the stopper is on both sides of the mover 120.

6). Sixth Embodiment It is also possible to configure the magnet of the mover with one multipolar magnet. Hereinafter, an example of this case will be described. FIG. 13 shows a vibration device 500. The vibration device 500 is different from the vibration device 100 of FIG. FIG. 13 shows a state where the top board 130 (see FIG. 1) is removed.

  In the vibration device 500, a multi-pole magnetized magnet 501 is attached to the mover 120. The magnet 501 has a substantially sector shape, and is magnetized to NSN (SNS when viewed from the back side) and three poles so that the polarities of adjacent magnetic poles are reversed along the direction of the circumference around the rotation axis. . The structure and operation principle of the other parts are the same as those of the vibration device 100 of FIG. By configuring the magnets arranged on the mover with one multi-pole magnetized magnet, the processing cost related to the mover can be reduced. The structure of the magnetic pole of this mover can also be applied to the structure of FIG.

7). Seventh Embodiment FIG. 14 shows a vibration device 600. The vibration device 600 is an example in which block-like stopper members 601 and 602 are employed in place of the stopper members 402 and 403 formed of leaf springs having spring properties in the vibration device 400 of FIG. The block-like stopper members 601 and 602 have a configuration using a material that can be handled as a member close to a rigid body such as a steel material, a configuration using a material that exhibits strong properties as an elastic body such as rubber, or both properties. The structure using materials, such as resin, is mentioned.

  When a material close to a rigid body is used as the stopper members 601 and 602, the repulsion of the mover 120 is close to the inelastic repulsion, energy loss is suppressed, and the time required for reversing the moving direction of the mover 120 is required. Therefore, a greater vibration can be obtained. Further, a collision sound and a feeling of impact when the movable element 120 collides with the stopper members 601 and 602 are obtained.

  If a material having elasticity is used as the stopper members 601 and 602, the repulsion of the mover 120 is close to the elastic repulsion, and the vibration can be tuned to a soft one. Further, it is possible to suppress the occurrence of a collision sound when the mover 120 collides with the stopper members 601 and 602. Further, by adjusting the material and structure of the stopper members 601 and 602, it is possible to adjust the degree of impact sound and impact feeling described above.

8). Eighth Embodiment A configuration in which the direction of the current flowing through the coils 104 and 105 in FIGS. 1, 7, and 10 and the coil 401 in FIG. 12 is switched at a predetermined frequency is also possible. In this case, for example, the resonance frequency of the system including the mover 120 is experimentally measured in advance, and the coils 104, 105 (or so that the mover 120 vibrates at a specific frequency based on the measurement result. The constant of the external drive circuit that switches the direction of the current flowing through the coil 401) may be determined.

9. Ninth Embodiment FIG. 15 shows an exploded state of the vibration device 700. FIG. 16 shows a state where the top plate 130 is removed from the vibration device 700. FIG. 17 shows the mover with the ball mounted on the vibration device 700. FIG. 18 shows a state of a cross section when the vibration device 700 is viewed from a direction perpendicular to the axis.

  In the vibration device 700, the same reference numerals as those of the vibration device 300 illustrated in FIG. 10 are the same as those of the vibration device 300. Hereinafter, parts of the vibration device 700 different from the vibration device 300 will be described. The vibration device 700 is different from the vibration device 300 of FIG. 10 in the structure of the bearing portion of the mover 120.

  That is, in the vibration device 700, the shaft pin 701 is fixed to the mover 120 (or has an integrally configured structure). A portion of the bottom plate 103 facing the shaft pin 701 is provided with a recess 702 in which the bottom plate 103 is recessed in a columnar shape. FIG. 16 shows a portion 702 ′ that bulges outward from the bottom plate 103 that corresponds to the outer portion of the recess 702. In addition, a concave portion 703 (see FIG. 18) is provided in the portion of the top plate 130 that the shaft pin 701 faces. FIG. 15 and FIG. 18 show a portion 703 ′ that bulges outward from the top plate 130 that hits the outer portion of the recess 703.

  Flat annular retainers 710 and 720 each functioning as a bearing ball retainer are attached to both ends of the shaft pin 701 so as to be rotatable with respect to the shaft pin 701. A plurality of grooves 711 are formed in the annular portion of the retainer 710 along the circumferential direction around the rotation axis. In each of the grooves 711, a bearing ball 712 can roll freely. Contained. A part of the retainer 710 holding the bearing ball 712 is received in the recess 702. In this state, the outer peripheral surface of the lower end portion of the shaft pin 701 is inside the recess 702 provided on the bottom plate 103 with the plurality of balls 712 interposed therebetween. It is supported by the cylindrical surface (side surface). In this state, the bearing ball 712 is in contact with the bottom surface of the recess 702, and the lower end surface of the shaft pin 701 is slightly lifted from the bottom surface of the recess 702 due to the bearing ball 712. When the bearing ball 712 rolls, the mover 120 can be rotated with respect to the case main body 101 about the shaft pin 701.

  Similarly, a plurality of grooves 721 are formed in the annular portion of the retainer 720 along the circumferential direction around the rotation axis, and the bearing ball 722 can freely roll in each of the grooves 721. It is housed in a state. A part of the retainer 720 holding the bearing ball 722 is accommodated in the recess 703, and in this state, the outer peripheral surface of the upper end portion of the shaft pin 701 is a recess 703 provided in the top plate 130 with the plurality of balls 722 separated. It is supported by the inner cylindrical surface (side surface). In this state, the bearing ball 722 is in contact with the upper surface of the recess 703, and the upper end surface of the shaft pin 701 is slightly away from the upper surface of the recess 703 due to the bearing ball 722. When the bearing ball 722 rolls, the movable element 120 can be rotated with respect to the top plate 130 about the shaft pin 701.

  As described above, the vibration device 700 includes the retainer 710 that partitions the bearing ball 712 and the recess 702 that is provided on the bottom plate 103 and in which at least a part of the retainer 712 is accommodated, and the mover 120 is fixed to the shaft pin 701. The retainer 710 is locked in the vicinity of the end of the shaft pin 701, and the bearing balls 712 arranged in each section of the retainer 710 can roll inside the recess 702 provided in the bottom plate 103. Contact. The retainer 720 that partitions the bearing ball 722 and a recess 703 that is provided on the top plate 130 and accommodates at least a part of the retainer 720 are provided. The retainer 720 is locked near the end of the shaft pin 701. The bearing balls 722 arranged in the respective sections of the retainer 720 come into contact with the inner side of the recesses 703 provided in the top plate 130 in a rollable state. Compared to the vibration device 300, the vibration device 700 is easier to manufacture and assemble. However, since the space for housing the bearing balls is not provided in the mover 120, the bottom plate 103 and the top plate 130 swell to the outside.

  In this embodiment, the recess 702 is an example of an accommodation area that accommodates a bearing ball 712 that constitutes a bearing and further accommodates a part of a retainer 710 that constitutes a bearing. The recess 703 is an example of an accommodation area that accommodates the bearing ball 722 constituting the bearing and further accommodates a part of the retainer 720 constituting the bearing.

10. Tenth Embodiment FIG. 19 shows a top view (A) of the vibration device 800, a side cross-sectional view (B) cut along the line AA in (A), and a perspective view (C) of the case body 101. Has been. The vibration device 800 is characterized by a bearing portion. Since the structure of other embodiments can be applied to the structure other than the bearing, the description thereof is omitted here. In this example as well, in the same manner as in the structure shown in FIG. 15, the bottom plate 103 is provided with a recess 702 that is recessed outward in a columnar shape, and the top plate 130 is also provided with a recess 703 that is recessed outward in a columnar shape. Yes.

  Further, the shaft pin 801 is fixed to the mover 120, and both end portions of the shaft pin 801 are formed into conical surfaces 802 and 803 by cutting off corners. At least a part of the conical surface 802 is accommodated inside the recess 702, and a plurality of bearing balls 804 can be rolled between the conical surface 802 and the inner corner of the recess 702. Is done. In addition, at least a part of the conical surface 803 is accommodated inside the recess 703, and a plurality of bearing balls 805 can roll between the conical surface 803 and the inner corner of the recess 703. Held in. Also, the bearing ball 804 prevents the lower end surface of the shaft pin 801 from contacting the bottom surface of the recess 702, and the bearing ball 805 prevents the upper end surface of the shaft pin 801 from contacting the upper surface of the recess 703. Has been.

  As described above, in the vibration device 800, the conical surfaces 802 and 803 are formed at the end portion of the shaft pin 801 fixed to the movable element 120, and the concave portion 702 in which at least a part of the conical surface 802 is accommodated in the bottom plate 103. The top plate 130 is provided with a recess 703 in which at least a part of the conical surface 803 is accommodated. The bearing ball 804 is in contact with the conical surface 802 of the shaft pin 801 and the inside of the recess 702 in a rolling state, and the bearing ball 805 is in contact with the conical surface 803 of the shaft pin 801 and the inside of the recess 703 in a rolling state. Yes. In this structure, the shaft pin 801 is supported in a rotatable state by using conical surfaces 802 and 803 formed at the edges of both ends of the shaft pin 801. In this structure, since a retainer (retainer) for holding the bearing balls is not used, the number of parts can be further reduced, and the overall thickness can be further reduced.

11. Others Aspects of the present invention are not limited to the individual embodiments described above, but include various modifications that can be conceived by those skilled in the art, and the effects of the present invention are not limited to the above-described contents. That is, various additions, modifications, and partial deletions can be made without departing from the concept and spirit of the present invention derived from the contents defined in the claims and equivalents thereof.

  The present invention can be used for a vibration device.

  DESCRIPTION OF SYMBOLS 100 ... Vibration apparatus, 101 ... Case main body (stator), 102 ... Side plate, 103 ... Bottom plate, 104 ... Coil, 104a ... 1st extension part, 104b ... 2nd extension part, 104c ... Outer peripheral part, 104d ... Inner peripheral part, 105a ... First extension part, 105b ... Second extension part, 105c ... Outer peripheral part, 105d ... Inner peripheral part, 105 ... Coil, 106 ... Fixed pin, 107 ... Axial pin, 108 ... Stopper member 109 ... Stopper part 110 ... Stopper part 111 ... Ball bearing 120 ... Movable element 121 ... Shaft hole 122 ... Magnet 123 ... Magnet 124 ... Magnet 125 ... Excavated part 126 ... Projection , 130 ... top plate, 131 ... pin fixing hole, 132 ... pin fixing hole, 140 ... circumferential direction around the rotation axis, 141 ... magnetic path, 142 ... magnetic path, 143 ... magnetic path, 144 ... magnetic Road, 14 ... Lorentz force, 146 ... Reaction force of Lorentz force, 150 ... Back yoke, 161 ... Switch, 162 ... Base, 163 ... Contact terminal, 164 ... Switch, 165 ... Base, 166 ... Contact terminal, 171 ... Detection resistance, 172 ... Detection resistance, 200 ... vibrating device, 300 ... vibrating device, 301 ... annular groove, 302 ... spacer, 302a ... reduced diameter portion, 303 ... retainer, 304 ... long hole, 305 ... bearing ball, 306 ... annular groove 307: Retainer, 308: Long hole, 309 ... Bearing ball, 310 ... Annular groove provided on the back side surface, 311 ... Spacer fixing hole, 400 ... Vibration device, 401 ... Coil, 402 ... Stopper member, 403 ... Stopper member, 404 ... magnet, 405 ... magnet, 500 ... vibration device, 501 ... multipolar magnetized magnet, 600 ... vibration device, 6 DESCRIPTION OF SYMBOLS 1 ... Block-shaped stopper member, 602 ... Block-shaped stopper member, 700 ... Vibration apparatus, 701 ... Shaft pin, 702 ... Recessed part, 702 '... Inflated part, 703 ... Recessed part, 703' ... Inflated outside 710: Retainer, 711 ... Groove, 712 ... Bearing ball, 720 ... Retainer, 721 ... Groove, 722 ... Bearing ball, 800 ... Vibration device, 801 ... Shaft pin, 802 ... Conical surface, 803 ... Conical surface, 804 ... Bearing ball, 805 ... bearing ball.

Claims (7)

The bottom plate,
A circular motion that reciprocates with respect to the bottom plate is possible, a center of gravity is provided at a position deviated from the center of the rotational axis of the circular motion,
A coil fixed to the bottom plate;
The reciprocating circular motion of the mover is generated by the Lorentz force acting between the magnetic field generated by the plurality of magnetic poles of the mover and the current flowing through the coil, and the direction of the current flowing through the coil is switched. Means for switching the direction of the reciprocating circular motion of the mover,
The vibrating device according to claim 1, wherein the movable element performs a reciprocating circular motion around the rotation axis.   The vibration device according to claim 1, wherein a stopper that limits a movable range of the mover is fixed to the bottom plate.   3. The vibration device according to claim 1, further comprising a unit that detects an angular position of the mover, wherein the polarity of energization to the coil is switched based on the detected angular position. Comprising a shaft fixed to the bottom plate,
4. The vibration device according to claim 1, wherein the movable element is capable of circular motion reciprocating around the axis. 5.   The movable element is formed with an accommodating area for accommodating at least a part of the bearing holding the shaft, and the movable element is centered on the axis in a state where at least a part of the bearing is accommodated in the accommodating area. The reciprocating circular motion as described above is possible. A shaft fixed to the mover;
And a top plate arranged facing the bottom plate,
The bottom plate is formed with a first housing region that houses at least a part of the first bearing that holds the shaft,
The top plate is formed with a second housing region that houses at least a part of the second bearing that holds the shaft,
In a state where at least a part of the first bearing is accommodated in the first accommodation area and at least a part of the second bearing is accommodated in the second accommodation area, the mover is The vibration device according to any one of claims 1 to 3, wherein a reciprocating circular motion about an axis is possible. Comprising a top plate arranged facing the bottom plate,
A bearing ball that contacts the bottom plate and the mover, rolls in a circumferential direction around the rotation axis with respect to the bottom plate and the mover, and holds a load in a thrust direction;
A bearing ball that contacts the top plate and the mover, rolls in a circumferential direction around the rotation axis with respect to the top plate and the mover, and holds a load in a thrust direction;
4. The vibration device according to claim 1, wherein the movable element is held in a state in which a reciprocating circular motion is possible between the bottom plate and the top plate. 5.

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