JP2019126160A - Vibration type motor and lens driving device using vibration type motor - Google Patents

Abstract

To provide a vibration type motor, the dimension of which is made compact in the driving direction.SOLUTION: A vibration type motor 10 has a transducer 11 vibrating upon application of a driver voltage, a friction member 12 friction sliding on the transducer 11, compression means 13 generating a compression force F1 for compressing the transducer 11 against the friction member 12, a holding member 14 for holding the friction member 12, an elastomer 15 energized by the friction member 12, and energization means for energizing the elastomer 15 to the friction member 12. A position regulation part 14a regulates the position of the friction member 12 for the holding member 14, and the friction member 12 is held when it is energized by the position regulation part 14a with the energization force F2 by the energization means.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vibration type motor and a lens drive device using the vibration type motor.

  The ultrasonic motor has characteristics of high power and quietness while being relatively small, and is used, for example, to drive a lens in an interchangeable lens of a single-lens reflex camera. Patent Document 1 discloses a linear drive type ultrasonic motor using a vibrating reed-type vibrator, and in the ultrasonic motor, a fixed portion is provided at both ends in the driving direction of the slider, and the fixed portion is screwed. It is fixed by fastening.

JP, 2016-82802, A

  In the conventional ultrasonic motor, the volume of the screw itself for fixing the fixed portion and the volume of the female screw portion with respect to the screw are required, and the dimension in the driving direction is enlarged. In addition, in the lens drive of the interchangeable lens of the single-lens reflex camera described above, the lens drive device has been enlarged in the optical axis direction because the ultrasonic motor is long in the drive direction.

  Therefore, it is an object of the present invention to provide a vibration type motor whose dimensions in the drive direction are reduced.

  In order to solve the above problems, the vibration type motor of the present invention generates a vibrator that vibrates by the application of a drive voltage, a friction member that frictionally slides with the vibrator, and a pressure that presses the vibrator against the friction member. A pressing means, a holding member for holding the friction member, an elastic body biased to the friction member, and a biasing means to bias the elastic body to the friction member The friction member is characterized in that the friction member is held by having a position restricting portion which restricts the position, and the friction member is urged against the position restricting portion by the urging force of the urging means.

  It is possible to provide a vibration type motor whose dimensions in the drive direction are reduced.

(A)-(D) It is a figure which shows the vibration type motor 10 which is 1st embodiment of this invention. FIG. 1 is a cross-sectional view of a vibration type motor 10 according to a first embodiment of the present invention. (A), (B) is a figure which shows the relationship of the force which acts on the friction member 12 in 1st embodiment of this invention. (A)-(D) It is a figure which shows the vibration type motor 20 which is 2nd embodiment of this invention. (A), (B) It is a figure which shows the relationship of the force which acts on the friction member 22 in 2nd embodiment of this invention. (A), (B) is a figure which shows the lens drive device to which this invention is applied.

(First embodiment)
The configuration of the vibration type motor 10 (ultrasonic motor) according to the first embodiment of the present invention will be described below. FIGS. 1A and 1B are perspective views of the vibration type motor 10 as viewed from different angles, and the driving direction of the vibration type motor 10 is represented by the X direction. FIGS. 1C and 1D are exploded perspective views of the vibration type motor 10 as viewed from the same direction as FIGS. 1A and 1B, respectively. FIG. 2 is a cross-sectional view of the vibration type motor 10 cut along a plane II-II in FIG.

  The vibration type motor 10 mainly includes a vibrator 11, a friction member 12, a pressure unit 13, a holding member 14, a damping body 15, and a holding guide mechanism 17 of the vibrator 11. The pressure means 13 is constituted by a pressure spring 131, a pressure plate 132 and a felt 133. The holding and guiding mechanism 17 includes a holding frame 171, a movable body 172, rolling balls 173, and a guide plate 174.

  The vibrator 11 includes, for example, a plate-like piezoelectric element 111, and an elastic member 112 having two projections 112a and a held part 112b. The piezoelectric element 111 is attached to the elastic member 112. The piezoelectric element 111 is, for example, PZT (lead zirconate titanate), and the elastic member 112 is, for example, a sheet metal such as stainless steel. When an appropriate drive voltage is applied to the piezoelectric element 111, the vibrator 11 vibrates (high frequency vibration of the frequency of the ultrasonic region), and an elliptical motion can be generated at the tip of the projection 112a. The holding frame 171 is adhered to the vibrator 11 and is held by the holding frame 171.

  The friction member 12 is, for example, a metal plate, and the projection 112a of the vibrator 11 is brought into pressure contact with the friction member 12 by the pressure F1 generated by the pressure means 13, and the projection 112a frictionally slides on the surface 12b of the friction member 12. Do. On the surface on the opposite side of the surface 12 b of the friction member 12, a concave portion forming a position restricting portion described later is provided. The concave portion is provided as two V-grooves 12 a along the drive direction and at three places along one direction orthogonal to the drive direction.

  The pressure spring 131 is a compression coil spring and generates a pressure force F1. The pressure F1 is transmitted to the vibrator 11 via the pressure plate 132 and the felt 133 to press the vibrator 11 against the friction member 12. By means of the felt 133, the pressing force F1 is transmitted to the vibrator 11 without inhibiting the vibration of the vibrator 11.

  The holding member 14 is, for example, a frame made of resin, and a convex shape portion constituting a position restricting portion for restricting the position of the friction member 12 is provided at corresponding positions of the three V grooves 12 a of the friction member 12. ing. The convex shaped portions are provided at three locations as spherical protrusions 14a. The respective spherical projections 14 a abut on the V-grooves 12 a of the friction member 12, and the friction member 12 is held by the holding member 14.

  The damping body 15 which is an elastic body is, for example, damping rubber having a convex shape (a cylindrical shape, a cylindrical shape, a protrusion shape) in cross section extending in the driving direction of the vibration type motor 10. Alternatively, the cross-sectional shape may be a step shape in which steps are continuous in the drive direction. The damping body 15 is sandwiched between the friction member 12 and the damping body fixing plate 16 and is incorporated into the vibration type motor 10 in a state of being elastically deformed. At this time, the damping body fixing plate 16 is fixed to the holding member 14 by screw fastening as shown. A reaction force when elastic deformation of the damping body 15 is restored is used as a biasing force F2 for biasing the damping body 15 to the friction member 12. The vibration of the friction member 12 can be suppressed by urging the damping member 15 which is a damping rubber against the friction member 12. In the vibration type motor 10 according to the first embodiment of the present invention, the two damping bodies 15 are incorporated by the damping body fixing plate 16 so as to be elastically deformed, and the damping body 15 itself generates the biasing force F2. The damping body 15 itself also serves as a biasing means. Further, the contact point between the damping body 15 and the friction member 12 may be in the vicinity of the antinode of the resonance of the friction member 12. By setting the contact point in the vicinity of the antinode of the resonance of the friction member 12 as described above, the resonance of the friction member 12 can be prevented.

  As shown in FIG. 3A, the friction member 12 is held by the combined force F3 of the pressing force F1 for pressing the vibrator 11 against the friction member 12 and the biasing force F2 for biasing the damping body 15 against the friction member 12. It is urged to. At this time, the V-groove 12a of the friction member 12 and the ball protrusion 14a of the holding member 14 are brought into pressure contact, so that the friction member 12 is held by the holding member 14 with no freedom.

  In FIG. 2, the holding frame 171 adhesively fixed to the vibrator 11 is loosely fitted to the pair of wall portions 172 a provided on the movable body 172, and is thus restrained in the driving direction of the vibration motor 10. The movable body 172 and the holding frame 171 are movably held in the direction of the pressing force F1 generated by the pressing spring 131. Thus, the driving force generated by the vibrator 11 can be extracted to the outside via the movable body 172 without inhibiting the pressure force F1 generated by the pressure spring 131. When it is desired to couple the vibrator 11 and the movable body 172 in the driving direction without rattling, a spring (not shown) may be disposed between the wall portion 172a of the movable body 172 and the holding frame 171 to perform rattling. . When it is desired to reduce the influence of the frictional force between the wall portion 172a of the movable body 172 and the holding frame 171 on the pressing force F1, a rolling roller (not shown) is provided between the wall portion 172a of the movable body 172 and the holding frame 171. To reduce the frictional force.

  Next, the holding of the friction member 12 will be described in detail with reference to FIGS. 3 (A) and 3 (B). FIG. 3A is a front view of the friction member 12 and FIG. 3B is a bottom view, with a pressing force F1 of the vibrator 11, a biasing force F2 by two damping members 15, and a pressing force F1. The resultant F3 of the force F2 is shown. Further, in FIG. 3B, points at which the pressing force F1, the biasing force F2, and the resultant force F3 act are shown as action points P1, P2, and P3, respectively. In addition, although the urging | biasing force F2 by two damping bodies 15 is disperse | distributed and acted in the drive direction in fact, suppose that it is acting on the action point P2 collectively for easy understanding. Since the biasing means (damping body 15 itself) for producing the biasing force F2 is fixed to the friction member 12, the point of action P2 of the biasing force F2 does not move. On the other hand, the pressing means 13 for generating the pressing force F 1 moves with the vibrator 11, so the point of action P 1 of the pressing force F 1 moves on the friction member 12. FIG. 3B shows the position of the application point P1 of the pressure F1 when the vibrator 11 has moved to the end of the drive stroke. Points P4, P5, and P6 are the positions of the spherical projections 14a of the holding member 14, and the friction member 12 is held in contact at three points P4, P5, and P6.

  In order to prevent the friction member 12 from separating from the ball protrusion 14a at all of the points P4, P5 and P6, it is necessary that the resultant F3 of the pressure F1 and the biasing force F2 be such that the friction member 12 is in pressure contact with the ball protrusion 14a. is there. The action point P3 needs to be located inside a triangle T indicated by a broken line formed by three points P4, P5 and P6 as shown in FIG. 3B. When the vibrator 11 has moved to the end of the drive stroke, the point of action P1 of the pressure F1 is farthest from the triangle T, so the resultant force F3 is most likely to be out of the inside of the triangle T. When the biasing force F2 has the same direction as the pressing force F1 as in the first embodiment of the present invention, it is assumed that the magnitude of the biasing force F2 is 1 or more times the magnitude of the pressing force F1, as shown in FIG. As shown in), the action point P3 of the resultant force F3 is disposed inside the triangle T formed by the points P4, P5 and P6.

  Referring to FIGS. 1C and 1D, the movable body 172 is provided with guide grooves 172b at two positions so as to extend in the driving direction. Further, a guide plate 174 which is a guide member is screwed to the holding member 14 and includes two guide portions 174a (guide grooves) extending in the driving direction. Three rolling balls 173, which are rolling members, are disposed between the guide groove 172b of the movable body 172 and the guide portion 174a of the guide plate 174, and the movable body 172 and vibration of the friction member 12 and the holding member 14 are arranged. The child 11 is held movably in the drive direction. In the above configuration, when the vibrator 11 is vibrated and an elliptical motion occurs in the projection 112a, a driving force is generated in the X direction between the projection 112a and the friction member 12, and the vibrator 11 and the movable body 172 are driven in the driving direction. It can be driven. The above is the configuration of the vibration type motor 10.

  Next, the features of the vibration type motor 10 will be described in comparison with the conventional example. The conventional ultrasonic motor disclosed in Patent Document 1 differs from the vibration type motor 10 of the present invention in that the slider is fixed to the end of the base member in the driving direction by a screw. The volume of the screw part was required, and the device was enlarged in the driving direction.

  The vibration type motor 10 according to the first embodiment of the present invention has the following two features, as compared with the conventional example described above. The first feature is that the holding member 14 holds the friction member 12 by urging the friction member 12 against the ball projections 14 a of the holding member 14 by the urging force F2. The second feature is that the biasing force F2 of the damping body 15 is used to bias the friction member 12 to the holding member 14.

  Next, the operation and effects of the vibration type motor 10 according to the first embodiment of the present invention will be described with reference to FIGS. 2 and 3B. The friction member 12 of the vibration type motor 10 of the present invention is sufficient if it comprises only the V groove 12a with which the ball protrusion 14a of the holding member 14 abuts, and the force to abut the friction member 12 against the holding member 14 Since the biasing force F2 of 15 is used, a fixing member such as a screw is unnecessary. With this configuration, since the fastening member necessary for holding the friction member 12 is unnecessary, the number of parts can be reduced, and the vibration type motor 10 can be miniaturized. That is, the length L1 in the drive direction of the vibration type motor 10 according to the first embodiment of the present invention can be shortened compared to the conventional example.

  In the vibration type motor 10 according to the first embodiment of the present invention, three spherical protrusions 14a which are position regulating portions of the holding member 14 are provided, and the biasing force F2 has the same direction as the pressing force F1. , The size is more than 1 time. When the friction member 12 is supported at three points as in the vibration type motor 10 and the directions of the biasing force F2 and the pressing force F1 are the same, the magnitude of the biasing force F2 is the magnitude of the pressing force F1 as described above. The friction member 12 is reliably supported at three points, and the drive characteristics are easily stabilized. For the above reason, at least three position regulating portions of the holding member 14 are provided, and the biasing force F2 preferably has the same direction as the pressing force F1 and the size is 1 or more.

  In the vibration type motor 10 according to the first embodiment of the present invention, the damping body 15 is fixed in an elastically deformed state, generates a biasing force F2 by a reaction force of the elastic deformation, and is biased by the friction member 12 Thus, the damping body 15 itself also serves as a biasing means. Although the structure in which the vibrator 11 is movable and the friction member 12 is fixed has been described, the same effect can be obtained in a structure in which the vibrator 11 is fixed and the friction member 12 is movable.

Second Embodiment
The configuration of the vibration type motor 20 according to the second embodiment of the present invention will be described below. FIGS. 4A and 4B are perspective views of the vibration type motor 20 viewed from different angles, and the driving direction of the vibration type motor 20 is represented by the X direction. FIGS. 4C and 4D are exploded perspective views of the vibration type motor 20 as viewed from the same direction as FIGS. 4A and 4B, respectively.

  The vibration type motor 20 mainly includes a vibrator 21, a friction member 22, a pressure means 23, a holding member 24, a damping body 25, and a holding guide mechanism 27 of the vibrator 21. The pressure means 23 is constituted by a pressure spring 231, a pressure plate 232 and a felt 233. The holding and guiding mechanism 27 includes a holding frame 271, a movable body 272, rolling balls 273, and a guide plate 274. The vibrator 21 is the same as the vibrator 11 of the vibration type motor 10, and thus the description thereof is omitted.

  The friction member 22 is, for example, a metal plate, and like the vibration type motor 10, the vibrator 21 is brought into pressure contact with the friction member 22 by the pressure F1 generated by the pressure means 23, and friction sliding on the surface 22b of the friction member 22 Do. The surface 22 b of the friction member 22 is provided with a concave portion that constitutes a position restricting portion. The concave portions are provided as two V-grooves 22 a along the driving direction and at three places along one direction orthogonal to the driving direction.

  The pressure spring 231 is a four tension coil spring, and generates a pressure force F1 in a direction to draw the pressure plate 232 and the movable body 272 together. The pressure F1 is transmitted to the vibrator 21 through the felt 233, and pressing the vibrator 21 against the friction member 22 is the same as the vibration type motor 10.

  The holding member 24 is in the form of a frame made of two resin members, and is a position restricting portion that restricts the position of the friction member 22 at the corresponding position of the three V grooves 22 a of the friction member 22. The convex-shaped part which comprises these is provided. The convex shaped portions are provided at three locations as spherical protrusions 24a. Each spherical projection 24 a abuts on the V groove 22 a of the friction member 22, and the friction member 22 is held by the holding member 24.

  The damping body 25 which is an elastic body is, for example, a sheet-like damping rubber extending in the driving direction of the vibration motor 20. Alternatively, the cross-sectional shape extending in the driving direction is a damping rubber having a convex shape (a cylindrical shape, a cylindrical shape, a protrusion shape). Alternatively, the cross-sectional shape may be a step shape in which steps are continuous in the drive direction. The damping body 25 is sandwiched and fixed by the friction member 22 and a guide plate 274 which is a guide member. A beam-like spring portion 274 b is formed on the guide plate 274, and when the guide plate 274 is screwed to the holding member 24, the spring portion 274 b is elastically deformed. In the vibration type motor 20, the reaction force of the elastic deformation of the spring portion 274b of the guide plate 274 is used as a biasing force F2 for biasing the damping body 25 to the friction member 22. As the damping body 25 is biased by the friction member 22, the vibration of the friction member 22 can be suppressed as in the vibration type motor 10. In the vibration type motor 20 according to the second embodiment of the present invention, the spring portion 274b of the guide plate 274 is elastically deformed to generate the biasing force F2, and the guide plate 274 doubles as biasing means. Further, the contact point between the damping body 25 and the friction member 22 may be in the vicinity of the antinode of the resonance of the friction member 22. By setting the contact point in the vicinity of the antinode of the resonance of the friction member 22 as described above, the resonance of the friction member 22 can be prevented.

  As shown in FIG. 5B, the friction member 22 is held by the combined force F3 of the pressing force F1 for pressing the vibrator 21 against the friction member 22 and the biasing force F2 for biasing the damping body 25 against the friction member 22. It is urged to. At this time, the V-shaped groove 22a of the friction member 22 and the ball protrusion 24a of the holding member 24 are brought into pressure contact, so that the friction member 22 is held by the holding member 24 with no freedom.

  Next, the holding of the friction member 22 will be described in detail with reference to FIGS. 5 (A) and 5 (B). 5A is a plan view of the friction member 22, and FIG. 5B is a front view, and a pressing force F1 of the vibrator 21, a biasing force F2 for biasing the damping member 25 to the friction member 22, and The resultant force F3 of the pressure F1 and the biasing force F2 is shown. Further, in FIG. 5B, points at which the pressing force F1, the biasing force F2, and the resultant force F3 act are shown as action points P1, P2, and P3, respectively. Although the urging force F2 urging the damping body 25 to the friction member 22 is actually dispersed in the driving direction, it is assumed that they act on the action point P2 collectively for easy understanding. The surface of the friction member 22 in contact with the vibrator 21 is the surface 22 b of FIG. 5 (B). The application point P2 of the biasing force F2 does not move, while the pressing means 23 for generating the pressing force F1 moves with the vibrator 21, so the action point P1 of the pressing force F1 moves on the friction member 22. Do. FIG. 5A shows the position of the application point P1 of the pressing force F1 when the vibrator 21 has moved to the end of the drive stroke. Points P4, P5, and P6 are positions of the spherical projections 24a of the holding member 24, and the friction member 22 is supported by being in contact at three points P4, P5, and P6.

  Similar to the vibration type motor 10, at all of the points P4, P5 and P6, the combined force F3 of the pressing force F1 and the biasing force F2 causes the friction member 22 to be the ball protrusion 24a so that the friction member 22 does not separate from the ball protrusion 24a It needs to be in the direction of pressing. Further, the action point P3 needs to be located inside a triangle T indicated by a broken line formed by three points P4, P5 and P6 as shown in FIG. 5 (A). As shown in FIG. 5A, when the direction of the biasing force F2 is opposite to the direction of the pressing force F1, if the magnitude of the biasing force F2 is three times or more the magnitude of the pressing force F1, the resultant force The action point P3 of F3 is disposed inside the triangle T. From the above reasons, in the second embodiment of the present invention, the magnitude of the biasing force F2 is three or more times the magnitude of the pressing force F1.

  Referring to FIGS. 4C and 4D, in the holding and guiding mechanism 27 of the vibrator 21, two members of a holding frame 271 having a wall 271a and a movable member 272 having a guide groove 272b are screwed together. A movable portion is configured. The holding member 24 is screwed to a guide plate 274 which is a guide member, and the guide plate 274 is provided with two guide portions 274a (guide grooves) extending in the driving direction. Three rolling balls 273 as rolling members are disposed between the guide groove 272b of the movable body 272 and the guide portion 274a of the guide plate 274, and the movable body 272 and the vibration with respect to the friction member 22 and the holding member 24 The child 21 is held movably in the drive direction. The configuration other than the above is the same as that of the vibration type motor 10. The above is the description of the configuration of the vibration type motor 20.

  Next, features of the vibration type motor 20 will be described. Like the vibration motor 10, the vibration motor 20 has the following two features. The first feature is that the holding member 24 holds the friction member 22 by urging the friction member 22 against the ball projections 24 a of the holding member 24 by the urging force F2. The second feature is that in order to bias the friction member 22 to the holding member 24, a biasing force F2 is used to bias the damping body 25 to the friction member 22.

  Next, the operation and effects of the vibration type motor 20 according to the second embodiment of the present invention will be described. The friction member 22 of the present invention is sufficient if it has only the V groove 22a with which the ball protrusion 24a of the holding member 24 abuts, and the force for abut the friction member 22 against the holding member 24 reduces the damping member 25 to the friction member 22 Since a biasing force F2 is used to bias the fixing member, a fixing member such as a screw is not necessary. With this configuration, since the fastening member necessary to hold the friction member 22 is unnecessary, the number of parts can be reduced, and the vibration motor 20 can be miniaturized. That is, the length in the driving direction of the vibration type motor 20 according to the second embodiment of the present invention can be shortened compared to the conventional example.

  In the vibration type motor 20 according to the second embodiment of the present invention, three spherical projections 24a which are position regulating portions of the holding member 24 are provided, and the biasing force F2 is opposite in direction to the pressing force F1. , The size is more than three times. When the friction member 22 is supported at three points as in the vibration type motor 20 and the directions of the biasing force F2 and the pressing force F1 are opposite to each other, the magnitude of the biasing force F2 is the magnitude of the pressing force F1 as described above. If the length is three times or more, the friction member 22 is reliably supported at three points, and the drive characteristics are easily stabilized. For the above reason, at least three position regulating portions of the holding member 24 are provided, and the biasing force F2 is preferably opposite in direction to the pressing force F1 and three times or more in size.

  In the vibration type motor 20 according to the second embodiment of the present invention, the spring portion 274b of the guide plate 274 is elastically deformed to generate the biasing force F2 by the reaction force thereof, and the guide plate 274 doubles as biasing means. . Alternatively, the elastic member may be a plate spring, and the friction member 22 may be biased via the damping rubber. Further, even in a structure in which the vibrator 21 is fixed and the friction member 22 is movable, the effect of the present invention can be obtained as in the vibration type motor 10.

(Example of application)
The structure of a lens drive device to which the present invention is applied will be described. FIG. 6A is a cross-sectional view showing a lens barrel 1 which is a lens driving device incorporating the vibration type motor 10 of the present invention. A lens barrel 1 is detachably attached to a camera body 2 as an imaging device, and an imaging element 2 a is provided in the camera body 2. The mount 9 of the camera body 2 has a bayonet portion for attaching the lens barrel 1 to the camera body 2. The lens barrel 1 has a fixed barrel 3 and is in contact with the flange portion of the mount 9. The fixed barrel 3 and the mount 9 are fixed to screws (not shown). The front barrel 4 holding the lens G1 and the rear barrel 5 holding the lens G3 are further fixed to the fixed barrel 3. The lens barrel 1 includes a focus lens holding frame 6 and holds a lens G2. The focus lens holding frame 6 is held by the front barrel 4 and the guide bar 7 held by the rear barrel 5 so as to be able to move in a straight line. The vibration type motor 10 is fixed to the rear barrel 5 with a screw or the like (not shown).

  FIG. 6B is a perspective view of the vibration type motor 10, the lens G2, the focus lens holding frame 6, and the guide bar 7. As shown in FIG. The movable body 172 of the vibration type motor 10 is provided with a shaft 172 c for transmitting the driving force to the outside, and engages with the engagement portion 6 a of the focus lens holding frame 6. With the above configuration, when the vibrator 11 of the vibration type motor 10 is driven, the driving force of the vibration type motor 10 is transmitted to the focus lens holding frame 6 via the movable body 172. The focus lens holding frame 6 is guided by the guide bar 7 to move linearly. The above is the description of the configuration of the lens barrel 1.

  Next, features, functions, and effects of the lens barrel 1 will be described. The feature of the lens barrel 1 is that the vibration type motor 10 of the present invention is used to drive the lens G2. As this action, since the vibration type motor 10 is miniaturized in the drive direction, it is mentioned that the length L1 occupied by the vibration type motor 10 which is a drive actuator of the lens G2 in the direction of the optical axis (C in the figure) is short. Be From the above reasons, according to the present invention, it is possible to provide the lens barrel 1 in which the length L2 in the optical axis direction is miniaturized. Further, in the lens barrel 1 of this application example, although an example using the vibration type motor 10 according to the first embodiment is shown, the vibration type motor 20 according to the second embodiment or the like is proposed in the present invention Similar effects can be obtained using any form of motor.

1 Lens barrel (lens drive unit)
10, 20 vibration type motor 11, 21 vibrator 12, 22 friction member 12a, 22a V groove (position regulating portion)
13, 23 Pressing means 14, 24 Holding members 14a, 24a Spheres (position regulating portion)
15, 25 Damping body (elastic body)
173, 273 Rolling ball (rolling member)
174, 274 Guide plate (guide member)
174a, 274a Guide 274b Spring F1 Force F2 Force G2 Lens

Claims (14)

A vibrator that vibrates by application of a drive voltage;
A friction member frictionally sliding on the vibrator;
Pressure means for generating a pressure force for pressing the vibrator against the friction member;
A holding member for holding the friction member;
An elastic body biased by the friction member;
Biasing means for biasing the elastic body against the friction member;
A position restricting portion that restricts the position of the friction member with respect to the holding member;
A vibration type motor characterized in that the friction member is held by urging the friction member against the position restricting portion by the urging force of the urging means.   The vibration type motor according to claim 1, wherein the position restricting portion is configured by a concave portion in the friction member and a convex portion in the holding member.   The vibration type motor according to claim 1, wherein the position restricting portion is formed in a shape of a V groove in the friction member and in a shape of a ball protrusion in the holding member.   The position restricting portion is provided at at least three points, and the biasing force has the same direction as the pressing force, and the magnitude is one or more times the pressing force. The vibration type motor according to any one of 3.   5. The elastic body according to claim 1, wherein the elastic body is fixed in a state of being elastically deformed, generates the biasing force by a reaction force of the elastic deformation, and doubles as the biasing unit. Vibration type motor.   The vibration type motor according to any one of claims 1 to 5, wherein the elastic body is a damping body, and the damping body biases the friction member.   The position restricting portion is provided at at least three points, and the biasing force is reverse in direction to the pressing force, and has a size three or more times greater than the pressing force. The vibration type motor according to any one of 3. A rolling member, and a guiding member having a guiding portion of the rolling member and a spring portion which elastically deforms,
The vibration type motor according to claim 7, wherein the guide member generates the biasing force by a reaction force of deformation of the spring portion, and also serves as the biasing unit.   The vibration type motor according to claim 8, wherein the elastic body is sandwiched by the friction member and the guide member.   The vibration type motor according to claim 7, wherein the elastic body is a leaf spring and biases the friction member through a damping body.   11. The vibration type motor according to claim 6, wherein the damping body is damping rubber, extends in a driving direction, and has a convex cross section.   The vibration motor according to any one of claims 1 to 11, wherein a contact point between the elastic body and the friction member is in the vicinity of an antinode of resonance of the friction member.   The vibration type motor according to any one of claims 1 to 12, wherein the vibration is a high frequency vibration of a frequency in an ultrasonic region, and the vibration type motor is an ultrasonic motor.   A lens driving device using the vibration type motor according to any one of claims 1 to 13 for driving a lens.

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