JP2018196284A - Vibration type actuator and electronic apparatus - Google Patents

Abstract

To reduce the deterioration of control performance in a vibration type actuator and to decrease shortening of the service life of a vibrator.SOLUTION: The vibration type actuator includes a vibrator 21 including a piezoelectric element 24 and a friction material 5 coming into contact with the vibrator. A vibrator holding member holds the vibrator outside a contact surface where the vibrator and the friction material are in contact with each other and is movable in a direction crossing the contact surface. The vibrator holding member has a first holding part and a second holding part and holds one place outside the contact surface in a relative moving direction by the first holding part and holds other places outside the contact surface in the relative moving direction by the second holding part.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a vibration type actuator and an electronic apparatus, and more particularly to a vibration type actuator that drives a driven body by generating an elliptical motion in a vibrator having a piezoelectric element.

  In general, a vibration type actuator is capable of silent operation and driving from low speed to high speed, and further has characteristics such as high torque output. For this reason, the vibration type actuator is used as a drive source of a digital camera and a lens unit, for example.

  Such a vibration type actuator has an annular driven body having a rotation axis and a plurality of vibrators, and the vibrator is predetermined on the driven body in a frictional contact state in which the driven body is pressurized. There is one that is arranged with an interval of (see Patent Document 1).

  In Patent Document 1, when vibration is excited in a vibrator in a frictional contact state, an elliptical motion occurs in a portion of the vibrator that is in contact with the driven body, and the driven body is driven to rotate about the rotation axis. To do. The urging of the vibrator with respect to the driven body is performed by a leaf spring.

  Here, a conventional vibration type actuator will be outlined.

  FIG. 8 is a diagram for explaining an example of a conventional vibration actuator. FIG. 8A is a sectional view, and FIG. 8B is a sectional view showing the operation.

  With reference to FIG. 8, the illustrated vibration type actuator has a vibrator 21. The vibrator 21 includes a vibration plate 22 including two protrusions 23 and a piezoelectric element 24 that is an electro-mechanical energy conversion element bonded to the vibration plate 22.

  The vibrator 21 is supported by a small base 38, and the small base 38 is formed with a round hole 38-1 and a long hole 38-2. The round hole 38-1 and the long hole 38-2 are fitted to shafts 37-1 and 37-2 formed in the lower base 37. Accordingly, the small base 38 is prohibited from moving in a direction other than the vertical direction with respect to the lower base 37.

  The lower base 37 is biased upward by a spring (not shown). As a result, the vibrator 21 is biased with a predetermined pressure against the friction material 5 via the pressing member 28 and the vibration insulating member 27. Therefore, when ultrasonic vibration is excited in the vibrator 21, elliptical motion occurs at the tips of the two protrusions 23, and a relative driving force in the X direction in the figure acts between the friction material 5 and the vibrator 21. To do.

JP-A-2006-136636

  However, in the vibration type actuator shown in FIG. 8, the small base 38 needs to move smoothly in the vertical direction so as not to hinder the biasing of the vibrator 21 against the friction material 5. For this reason, it is necessary to provide a slight gap of, for example, about 10 μm between the round hole portion 38-1 and the shaft portion 37-1.

  As shown in FIG. 8B, in order for the lower base 37 to move in the direction of the solid line arrow A in the drawing, a force in the direction of the solid line arrow 39 must be applied to the friction material 5. Therefore, the force 40 is applied as a reaction force to the two protrusions 23-1 and 23-2 of the vibrator 21.

  Due to the force 40, a rotational moment centering around the round hole 38-1 acts on the small base 38. As described above, since a slight gap is provided between the round hole portion 38-1 and the shaft portion 37-1, the small base 38 is indicated by a solid line arrow within a range allowed by the gap. Tilts due to counterclockwise rotational moment.

  As a result, the pressing force of the protrusion 23-1 on the friction material 5 is increased, and the pressing force of the protrusion 23-2 on the friction material 5 is decreased. In such a situation, the control performance of the vibration type actuator is deteriorated, and further, the wear of one of the protrusions is advanced and the life of the vibrator 21 is shortened.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a vibration type actuator and an electronic device that can reduce the deterioration of control performance and reduce the life of a vibrator.

  To achieve the above object, a vibration type actuator according to the present invention includes an electro-mechanical energy conversion element, and generates a vibration corresponding to an AC voltage applied to the electro-mechanical energy conversion element. A vibration type actuator that relatively moves the vibrator and the friction material, wherein the vibration is generated outside a contact surface where the vibrator and the friction material are in contact with each other. A first holding member that holds the child and is movable in a direction intersecting the contact surface; the first holding member includes a first holding portion and a second holding portion; One holding portion holds one place outside the contact surface in the relative movement direction, and the second holding portion holds another place outside the contact surface in the relative movement direction. Features .

  According to the present invention, the tilt of the vibrator can be reduced. As a result, it is possible to reduce the deterioration of the control function and the life of the vibrator.

It is a figure for demonstrating an example of the vibration type actuator by the 1st Embodiment of this invention. It is a figure for demonstrating the structure of the mobile body unit shown in FIG. It is a perspective view which decomposes | disassembles and shows the drive unit provided in the lower base shown in FIG. FIG. 4 is a perspective view schematically showing a vibrator (vibrating body) provided in the drive unit shown in FIG. 3. It is a figure for demonstrating an example of the bending vibration mode in the vibrating body shown in FIG. It is a figure for demonstrating in detail the drive unit and friction material which are shown in FIG. It is a figure for demonstrating an example of the vibration type actuator by the 2nd Embodiment of this invention. It is a figure for demonstrating an example of the conventional vibration type actuator.

  Hereinafter, an example of a vibration type actuator according to an embodiment of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a view for explaining an example of a vibration type actuator according to the first embodiment of the present invention. FIG. 1A is a side view showing a partially broken lens barrel provided in a digital camera, which is one of electronic devices, and FIG. 1B is a linear view shown in FIG. It is a perspective view which shows a drive unit.

  In FIG. 1A, the lens barrel 60 has a linear drive unit 70 having a vibration type actuator. In the illustrated example, members other than the outer frame 51, the zoom zoom lens 52, the zoom lens holder 53, and the guide shaft 54 are omitted for convenience of explanation.

  The lens barrel 60 has an outer frame 51, and a zoom lens 52 is held by a zoom lens lens holder 53. The zoom lens holder 53 is supported on the guide shaft 54. The guide shaft 54 extends along the optical axis 55 of the lens barrel 60 and guides the zoom lens holder 53 along the optical axis 55. The linear drive unit 70 drives the zoom lens holder 53 along the optical axis 55.

  The linear drive unit 70 supports a movable body unit 56 on which a vibration type actuator is mounted so as to be movable along the optical axis 55. A cylindrical engagement pin 57 is disposed on the top of the zoom lens holder 53, and the engagement pin 57 engages with a hole formed in the moving body unit 56. When the moving body unit 56 moves a predetermined distance in accordance with control of a control unit (not shown), the zoom lens holder 53 reaches a predetermined position.

  FIG. 2 is a diagram for explaining the configuration of the mobile unit shown in FIG. 1. 2A is a cross-sectional view of the linear drive unit on a plane orthogonal to the moving direction of the moving body unit, and FIG. 2B is a perspective view showing the moving body unit.

  With reference to FIGS. 1 and 2, the linear drive unit 70 includes a lower plate 1 and an upper plate 2. Each of the lower plate 1 and the upper plate 2 is a rectangular plate having an opening hole. The lower plate 1 and the upper plate 2 are connected by a left block 3 and a right block 4. The lower plate 1, the upper plate 2, the left block 3, and the right block 4 constitute a housing for the linear drive unit 70.

  As illustrated, an elongated plate-like friction material 5 is fixed to the left block 3 and the right block 4 with screws at both ends thereof. A round bar-shaped guide shaft 6 is fixedly supported by the left block 3 and the right block 4 at both ends, and the movable body unit 56 is guided by the guide shaft 6.

  The moving body unit 56 includes a lower base 7, an upper base 9, two drive units 20, and two tension springs 11. The lower base 7 is formed with a round hole into which the guide shaft 6 is inserted and a rotation shaft 8 for rotatably supporting the upper base 9. The upper base 9 is formed with a round hole into which the rotary shaft 8 is inserted. The upper base 9 is supported by the lower base 7 so as to be rotatable about the rotary shaft 8.

  Each of the lower base 7 and the upper base 9 is provided with a drive unit 20. By suspending the tension spring 11 on the hook-shaped portions provided at the tips of the lower base 7 and the upper base 9, both the drive units 20 are urged against the friction material 5 with a predetermined pressure.

  3 is an exploded perspective view showing the drive unit provided on the lower base shown in FIG.

  The vibrator 21 has a diaphragm 22 having two protrusions 23, and a piezoelectric element 24 that is one of electro-mechanical energy conversion elements is bonded to the diaphragm 22. The diaphragm 22 is made of an iron-based metal (for example, SUS420J2), and the protrusion 23 is integrally formed on the diaphragm 22 by press working or the like.

  In the illustrated example, the protrusion 23 is integrally processed with the diaphragm 22, but the protrusion 23 may be attached to the diaphragm 22 using a technique such as welding.

  The vibrator 21 is supported by a first small base 25 and a second small base 26 which are separate members and are arranged separately. Cylindrical positioning pins 25-1 and 26-1 are formed on the first small base 25 and the second small base 26, respectively. The positioning pins 25-1 and 26-1 engage with the round hole 22-1 and the elongated round hole 22-2 formed at both ends of the diaphragm 22, respectively, and are joined by adhesion or welding.

  The first small base 25 and the second small base 26 are each provided with a round hole and an oblong hole. In these round holes and oblong holes, cylindrical positioning pins 7-1 and 7-2 and positioning pins 7-3 and 7-4 formed on the lower base 7 are fitted.

  With the above configuration, the first small base 25 and the second small base 26 are basically allowed to move only in the vertical direction.

  The vibrator 21 is pressed by the lower base 7 that is biased upward by receiving the tensile force of the tension spring 11 shown in FIG. 2 through the pressing member 28 and the vibration insulating member 27 composed of a felt-like member. In response, the friction material 5 is brought into pressure contact. By applying a pressing force to the vibrator 21 through the vibration insulating member 27, the vibration of the vibrator 21 is transmitted to the friction material 5 without being hindered by the pressurization.

  In the illustrated example, felt is used as the vibration insulating member 7, but an elastic member such as synthetic leather, rubber, or malt plain may be used. By adhering the vibration insulating member 27 to the pressing member 28, the contact position with the piezoelectric element 24 can be stabilized. The vibration insulating member 27 may be bonded to the piezoelectric element 24.

  Note that the drive unit 20 provided on the upper base 9 is vertically symmetrical with the drive unit 20 provided on the lower base 7, and the configuration thereof is the same, so the description thereof is omitted here.

  FIG. 4 is a perspective view schematically showing a vibrator (vibrating body) provided in the drive unit shown in FIG.

  In FIG. 4, the vibrator (vibrating body), the diaphragm, the protrusion, and the piezoelectric element are denoted by reference numerals 301, 304, 306, and 305, respectively. As shown in the figure, a piezoelectric element 305 is bonded to the vibration plate 301 on the surface opposite to the surface on which the protrusions 306 are formed, thereby forming the vibration body 301. An AC voltage is applied to the piezoelectric element 305.

  FIG. 5 is a diagram for explaining an example of a bending vibration mode in the vibrating body shown in FIG. FIG. 5A shows the first bending vibration mode (A mode), and FIG. 5B shows the second bending vibration mode (B mode).

  The first bending vibration mode shown in FIG. 5A is referred to as an A mode. The A mode is a secondary bending motion in the long side direction (X direction) of the rectangular vibrator 301 and has three nodes parallel to the short side direction (Y direction).

  The protrusion 306 is disposed in the vicinity of a position that becomes a node in the A-mode vibration, and reciprocates in the X direction (direction parallel to the surface to which the piezoelectric element 305 is bonded) by the A-mode vibration.

  In FIG. 5B, the second bending vibration mode is called a B mode. The B mode is a primary bending vibration in the short side direction (Y direction) of the rectangular vibrating body 304 and has two nodes parallel to the long side direction (X direction). The nodes in the A mode and the nodes in the B mode are orthogonal to each other in the XY plane.

  The protrusion 306 is disposed in the vicinity of the antinode in the B mode vibration, and reciprocates in the Z direction (direction perpendicular to the surface to which the piezoelectric element 305 is bonded) by the B mode vibration.

  When the above-described vibrations in the A mode and the B mode are generated with a predetermined phase difference, the tip of the protrusion 306 performs an elliptical motion, and a driving force is applied in the X direction (a direction parallel to the surface to which the piezoelectric element 305 is bonded). give.

  FIG. 6 is a diagram for explaining the drive unit and the friction material shown in FIG. 2 in detail. FIG. 6A is a sectional view showing the configuration, and FIG. 6B is a sectional view showing the operation.

  In the illustrated example, a cross section of the drive unit 20 and the friction material 5 provided on the lower base (second holding member) 7 is shown. As described above, the first small base 25 and the second small base 26 have round holes (engaging portions) 25-2 and 26-2, an oblong hole 25-3, 26-3 is provided.

  Columnar positioning pins (locking portions: guide members) 7-1 and 7-2 and positioning pins 7-3 and 7-4 formed on the lower base 7 are round holes 25-2 and 26-2, respectively. The oblong holes 25-3 and 26-3 are inserted.

  The first small base 25 and the second small base 26 constitute a first holding member.

  Due to the round holes 25-2 and 26-2 and the positioning pins 7-1 and 7-3, the first small base 25 and the second small base 26 come into contact with the vibrator 21 of the friction material 5. The position in the plane parallel to is regulated. Further, since the cylindrical positioning pins 7-2 and 7-4 are fitted and inserted into the oblong holes 25-3 and 26-3, the first small base 25 and the second small base 26 are in friction. The rotation of the material 5 in a plane parallel to the surface in contact with the vibrator 21 is restricted.

  With the above-described configuration, the first small base (first holding unit) 25 and the second small base (second holding unit) 26 are moved in directions other than the vertical direction with respect to the lower base 7. Movement will be prohibited.

  Here, in order to enable movement in the vertical direction, there is a slight gap (predetermined gap) between the round hole 25-2 and the positioning pin 7-1, and the round hole 26-2 and the positioning pin 7-3. Is provided. Furthermore, the positional relationship between the positioning pin 25-1 and the round hole 25-2 and the positional relationship between the positioning pin 26-1 and the round hole 26-2 are set to be substantially the same. Note that the same positional relationship means that both distances and directions coincide.

  As shown in FIG. 6B, in order for the lower base 7 to move in the direction of the solid arrow A, it is necessary to apply a force in the direction of the solid arrow 39 to the friction material 5. For this reason, the force 40 shown by the solid line arrow acts as a reaction force on the two protrusions 23-1 and 23-2 of the vibrator 21. Due to this force 40, the first small base 25 and the second small base 26 have a counterclockwise rotational moment centered around the round hole portions 25-2 and 26-2 as indicated by solid arrows. Acts and tilts.

  On the other hand, as described above, the positional relationship between the positioning pins 25-1 and the round holes 25-2 in the first small base 25 and the positioning pins 26-1 and the round holes 26-2 in the second small base 26 Are set to be substantially the same. Here, “substantially the same” includes substantially the same case in addition to the same case.

  For this reason, the vibrator 21, the first small base 25, the second small base 26, and the lower base 7 have a relationship like a parallel link. Therefore, the first small base 25 and the second small base 26 are inclined by substantially the same amount in substantially the same direction (counterclockwise).

  However, the distance from the positioning pin 25-1 to the round hole 25-2 in the first small base 25 and the distance from the positioning pin 26-1 to the round hole 26-2 in the second small base 26 are approximately. Equal (equal or substantially equal). Therefore, the vibrator 21 slightly moves in the X direction but does not tilt. Therefore, the control performance is not deteriorated, and furthermore, the wear at both protrusions proceeds evenly, so that the life is not reduced.

  Here, it will be further described that the positional relationship between the positioning pin 25-1 and the round hole 25-2 is substantially the same as the positional relationship between the positioning pin 26-1 and the round hole 26-2.

  Referring to FIG. 6A, here, “substantially the same” means that the X-direction distance and the Y-direction distance of the point C of the round hole 25-2 with respect to the point A of the positioning pin 25-1 are the points of the positioning pin 26-1. It means that it substantially matches the distance in the X direction and the distance in the Y direction of the point D of the round hole 26-2 with respect to B. Note that “substantially match” means matching or substantially matching.

  Point A is a point on the central axis of the positioning pin 25-1, and point B is a point on the central axis of the positioning pin 26-1. Point C is a point on the central axis of the round hole 25-2, and point D is a point on the central axis of the round hole 26-2. And these points A-D are located in the center of a positioning pin and a round hole, respectively.

  It is most preferable that the X-direction distance and the Y-direction distance are the same. The effect of the slope is offset. Therefore, the same effect can be obtained only by dividing the small base. Furthermore, the same effect can be obtained by simply configuring the two divided small bases to be inclined in substantially the same direction (counterclockwise). The same applies to the second embodiment described later.

  In the above-described example, the direction in which the first small base 25 and the second small base 26 are movable is the vertical direction. The vertical direction refers to the friction material 5 and the protrusion 23 of the vibrator 21. The direction perpendicular to the contact surface.

  The direction in which the first small base 25 and the second small base 26 can move is most preferably a direction orthogonal to the contact surface, that is, a direction that forms an angle of 90 degrees with the contact surface, but is not limited thereto. For example, there is no practical problem even if the direction intersects 70 degrees or more and less than 90 degrees. In this case, the angles of the round holes 25-2 and 26-2 and the cylindrical positioning pins 7-1 and 7-3 are also set to the angles.

  Furthermore, in the above-described example, the first small base 25 and the second small base 26 are formed with round holes and oblong holes, and the lower base 7 is provided with a cylindrical positioning pin. On the other hand, the same effect can be obtained by providing cylindrical positioning pins on the first small base 25 and the second small base 26 to form round holes and long round holes in the lower base 7. It is done.

  That is, if a round hole and an oblong hole are formed in one of the first holding member and the second holding member, and a cylindrical positioning pin is provided on the other of the first holding member and the second holding member. Good.

  In the above example, the case where the friction material 5 is stationary and the drive unit 20 is moved has been described. However, the drive unit 20 may be stationary and the friction material 5 may be moved. A similar effect can be obtained.

  As described above, in the first embodiment of the present invention, since the inclination of the vibrator caused by the rotational moment is reduced, the wear amount of the protrusion can be made almost uniform, and the controllability is further improved. Thus, the life of the vibration type actuator can be extended.

[Second Embodiment]
Next, an example of a vibration type actuator according to the second embodiment of the present invention will be described.

  FIG. 7 is a view for explaining an example of a vibration type actuator according to the second embodiment of the present invention. FIG. 7A is a perspective view showing the main part, and FIG. 7B is a sectional view thereof. The drive unit 80 provided on the upper base 9 is vertically symmetrical with the drive unit 80 provided on the lower base 67, and the configuration thereof is the same.

  The vibrator 21 includes a diaphragm 22 having two protrusions 23 and a piezoelectric element 24 that is an electro-mechanical energy conversion element bonded to the diaphragm 22. The vibrator 21 is supported by a first small base 85 and a second small base 86 which are separate members and are arranged separately.

  Columnar positioning pins 85-1 and 86-1 formed on the first small base 85 and the second small base 86 are round holes 22-1 and oblong holes formed at both ends of the diaphragm 22. 2-2 are respectively engaged and joined by adhesion or welding.

  Convex portions 85-2, 85-3, 86-2, and 86-3 having a rectangular cross section (rectangular cross section) are formed on both sides of the first small base 85 and the second small base 86, respectively. ing. On the other hand, the lower base 67 is provided with four U-shaped engaging portions 67-1 to 67-4 at positions corresponding to the convex portions. The widths of the concave portions in the engaging portions 67-1 to 67-4 are slightly larger than the widths of the convex portions 85-2, 85-3, 86-2, and 86-3.

  Position restriction is performed by the convex part and the U-shaped engagement part, and rotation restriction is performed. With this configuration, the first small base 85 and the second small base 86 are basically allowed to move only in the vertical direction.

  Similarly to the first embodiment, the vibrator 21 includes a vibration insulating member 27 composed of a pressing member 28 and a felt-like member from a lower base 67 that is biased upward by receiving a tensile force of a tension spring. The pressure is applied to the friction material 5 through pressure.

  As described above, the first small base 85 and the second small base 86 are prohibited from moving in directions other than the vertical direction with respect to the lower base 67. On the other hand, a small gap is provided between the concave portions of the engaging portions 67-1 to 67-4 and the convex portions 85-2, 85-3, 86-2, and 86-3 so as to be movable in the vertical direction. It has been.

  Further, the positional relationship between the positioning pin 85-1 and the convex portions 85-2 and 85-3 and the positional relationship between the positioning pin 86-1 and the convex portions 86-2 and 86-3 are set to be substantially the same. .

  In order to move the lower base 67 in the direction of the solid line arrow A, it is necessary to apply a force 89 in the direction shown by the solid line arrow to the friction material 5 as shown in FIG. For this reason, the force 90 shown by the solid line arrow acts on the two protrusions 23 of the vibrator 21 as a reaction force.

  As a result of this force 90, a counterclockwise rotational moment acts on the first small base 85 and the second small base 86 around the convex portions 85-2 and 86-2 as indicated by solid arrows. Then tilt.

  On the other hand, the positional relationship between the positioning pins 85-1 and the convex portions 85-2 and 85-3 in the first small base 85 and the positioning pins 86-1 and the convex portions 86-2 and 86 in the second small base 86. The positional relationship of −3 is set to be substantially the same. Therefore, the vibrator 21, the first small base 85, the second small base 86, and the lower base 67 are in a relationship like a parallel link, so that the first small base 85 and the second small base 85 are connected to each other. The small base 86 is inclined by substantially the same amount.

  However, the distance from the positioning pin 85-1 to the convex portion 85-2 in the first small base 85 is substantially equal to the distance from the positioning pin 86-1 to the convex portion 86-2 in the second small base 86. . For this reason, the vibrator 21 moves slightly in the X direction but does not tilt. Therefore, in the illustrated vibration type actuator, the control performance is not deteriorated, and the wear of both the protrusions progresses evenly, so that the lifetime is not reduced.

  In the second embodiment, the small bases 85 and 86 are provided with rectangular convex portions, and the lower base 67 is provided with a U-shaped engaging portion. On the other hand, a U-shaped engagement portion is provided on the small bases 85 and 86, and a rectangular convex portion is provided on the lower base so that movement in a direction other than the vertical direction with respect to the lower base 67 is prohibited. Also good.

  As described above, also in the second embodiment of the present invention, since the inclination of the vibrator caused by the rotational moment is reduced, the amount of wear of the protrusion can be made substantially uniform, and the controllability is further improved. This can improve the life of the vibration type actuator.

  The above-described vibration type actuator is used, for example, when driving an optical lens and a lens holder (driving member) along an optical axis in a lens barrel provided in a digital camera which is one of electronic devices. For example, the vibration type actuator is used for driving a zoom lens, a focus lens, and the like. The above-described vibration type actuator may be used for a robot, for example.

  As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to these embodiment, Various forms of the range which does not deviate from the summary of this invention are also contained in this invention. .

DESCRIPTION OF SYMBOLS 5 Friction material 7 Lower base 9 Upper base 20 Drive unit 21 Vibrator 22 Diaphragm 23 Protrusion part 24 Piezoelectric element 25,26 Small base 56 Moving body unit

Claims (13)

An oscillator having an electro-mechanical energy conversion element that generates vibration according to an alternating voltage applied to the electro-mechanical energy conversion element; and a friction material that contacts the oscillator; And a vibration type actuator for relatively moving the friction material,
A first holding member that holds the vibrator outside a contact surface where the vibrator and the friction material contact, and is movable in a direction intersecting the contact surface;
The first holding member has a first holding part and a second holding part, and holds the one of the outer sides of the contact surface in the relative movement direction by the first holding part, and the second holding part. A vibration type actuator that holds the other outer side of the contact surface in a relative movement direction by the holding portion.   The vibration-type actuator according to claim 1, further comprising a second holding member that holds the first holding member so as to be movable in a direction intersecting the contact surface.   The vibration type actuator according to claim 1, wherein the first holding member is divided into the first holding part and the second holding part.   The vibration type actuator according to claim 2, wherein the vibrator, the first holding unit, the second holding unit, and the second holding member are defined in a relationship of parallel links. . A first restricting means for restricting a position of the first holding portion and the second holding portion on the contact surface with respect to the second holding member;
5. The vibration according to claim 2, further comprising: a second restricting unit that restricts rotation of the contact surface with respect to the first holding part and the second holding part. Type actuator.   The positional relationship between the first holding unit and the first restricting unit is the same as the positional relationship between the second holding unit and the first restricting unit. Vibration type actuator.   The distance from the position where the first holding part holds the vibrator to the first restricting means is the distance from the position where the second holding part holds the vibrator to the first restricting means. The vibration type actuator according to claim 5, wherein the vibration type actuators are equal. The direction from the position where the first holding unit holds the vibrator to the first regulating means is the direction from the position where the second holding part holds the vibrator to the first regulating means. The vibration type actuator according to claim 5, wherein the vibration type actuators are equal. The first restricting means is provided on one of the first holding member and the second holding member and extends in a direction intersecting the contact surface;
The engagement portion provided on the other of the first holding member and the second holding member and engaged with the locking portion. Vibration type actuator.   The vibration type actuator according to claim 9, wherein the locking portion is a rod-shaped guide member, and the engagement portion is a hole portion into which the guide member is inserted.   The vibration type actuator according to claim 9, wherein the locking portion is a convex portion having a rectangular cross section, and the engaging portion is a concave portion into which the convex portion is inserted.   12. The vibration type actuator according to claim 1, further comprising a biasing unit that biases the vibrator or the friction material to bring the vibrator into contact with the friction material. The vibration type actuator according to any one of claims 1 to 12,
A driving member driven by driving of the vibration type actuator;
An electronic device comprising:

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