JP4394148B2 - Driving part of lens with ultrasonic motor and electronic device using the same - Google Patents

Description

  The present invention relates to a component with an ultrasonic motor that relatively moves an inner cylinder and an outer cylinder by a piezoelectric vibrator provided in a gap between the inner cylinder and the outer cylinder, and an electronic apparatus using the same.

  Recently, in the field of micromotors, an ultrasonic motor that obtains a driving force by using the piezoelectric effect of a piezoelectric element has attracted attention.

  This ultrasonic motor is used, for example, to relatively move an inner cylinder and an outer cylinder of a camera.

FIG. 16 shows a cross-sectional structure of a camera in which an inner cylinder and an outer cylinder are moved relative to each other using the ultrasonic motor according to the first conventional example.

  The camera 100 includes a lens 101a, an inner cylinder 102 fixed to the outer periphery of the lens 101a, an outer cylinder 103 provided outside the inner cylinder 102 and having a lens 101b fixed to the inner periphery, an outer cylinder 103, and an inner cylinder. A distance ring 104 provided in a gap with the distance 102, an ultrasonic motor 105 having an annular vibrator 105a, which is fixed to an end of the distance ring 104, is incorporated in the inner cylinder 102, and is disposed at a distance from the inner cylinder 102. The ring 104 is engaged by helicoid screws 102a and 104a, and the outer cylinder 103 and the distance ring 104 are engaged by helicoid screws 103a and 104b (see Patent Document 1).

  When the annular vibrator of the ultrasonic motor 105 is rotated together with the distance ring 104, the inner cylinder 102 moves forward and backward while rotating by the helicoid screws 102a and 104a. The focal length between the lens 101a and the lens 101b is adjusted by the change in the relative distance between the inner cylinder 102 and the outer cylinder 103.

  FIG. 17 shows a cross-sectional structure of a camera in which the inner cylinder and the outer cylinder are moved relative to each other using the ultrasonic motor according to the second conventional example.

  The camera 110 includes a lens 111, an outer cylinder 112 that fixes the outer edge of the lens, an inner cylinder 113 provided inside the outer cylinder 112, an outer cylinder 112, and a cylindrical vibrator 114a. And the fixing member 115 for fixing to the inner cylinder 113, and the outer cylinder 112 and the inner cylinder 113 are engaged by helicoid screws 112a and 113a, The cylinder 112 and the ultrasonic motor 114 are engaged by helicoid screws 112b and 114a (see Patent Document 2).

When the cylindrical vibrator 114a of the ultrasonic motor 114 is rotated, the outer cylinder 112 advances while rotating by the helicoid screws 112b and 114a, and the inner cylinder 113 rotates while the outer cylinder 112 rotates by the helicoid screws 112a and 113a. Move backward relative to. Thereby, the focal length of the lens 111 is adjusted.
JP 59-1103889 A Japanese Patent Laid-Open No. 4-145881

  However, in the ultrasonic motor 105 according to the first conventional example, an appropriate thickness is required between the inner circumference and the outer circumference of the annular vibrator 105a, and the method for supporting the annular vibrator 105a is difficult. There was a problem that it was not suitable for a structure requiring miniaturization.

    In addition, the ultrasonic motor 114 according to the second conventional example has an advantage of being easily fixed and supported, but is too large to be disposed in the gap between the outer cylinder 112 and the inner cylinder 113, so that it is difficult to reduce the size. Not appropriate. Furthermore, since the ultrasonic motor 114 transmits the driving force via the helicoid screws 112a and 113a, the helicoid screws 112b and 114a, etc., the ultrasonic motor 114 has problems such as a reduction in output and a large transmission loss.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a component with an ultrasonic motor that maintains the output and has no transmission loss of the output, and an electronic apparatus using the same, while reducing the size of the apparatus configuration.

That is, the means for solving the problem includes a cylindrical outer cylinder, a cylindrical inner cylinder provided inside the outer cylinder, and a rectangular piezoelectric element provided in a gap between the outer cylinder and the inner cylinder. In the ultrasonic motor-equipped component including the vibrator, the inner cylinder has an outer flange portion that protrudes from an outer peripheral surface in a radial direction that is the direction of the outer cylinder, and the piezoelectric vibrator includes the outer cylinder It is supported by the inner peripheral surface, is pressed against the outer flange portion of the inner cylinder in the longitudinal direction of the inner cylinder, and is applied with a driving force in the circumferential direction of the inner cylinder .

As another example, a cylindrical outer cylinder, a cylindrical inner cylinder provided inside the outer cylinder, and a rectangular piezoelectric vibration provided in a gap between the outer cylinder and the inner cylinder In the component with an ultrasonic motor provided with a child, the outer cylinder has an inner flange portion protruding in a radial direction that is the direction of the inner cylinder from an inner peripheral surface, and the piezoelectric vibrator is arranged on the inner cylinder. While being supported by the outer peripheral surface, the inner cylinder is pressed against the inner flange portion of the outer cylinder in the longitudinal direction of the outer cylinder, and a driving force is applied in the circumferential direction of the outer cylinder .

  In addition, the piezoelectric vibrator is preferably provided so that the thinnest thickness direction and the radial direction of the inner cylinder and the outer cylinder coincide with each other from the viewpoint of downsizing the apparatus.

  According to these, since the piezoelectric vibrator is provided in the gap between the outer cylinder and the inner cylinder, it is not necessary to provide a new space, and the piezoelectric vibrator may be provided in a part of the outer cylinder and the inner cylinder. Therefore, the thickness of the outer cylinder and the inner cylinder can be reduced.

  Further, since the driving force is applied by being brought into pressure contact with one of the inner cylinder or the outer cylinder, no power transmission mechanism is required, and no transmission loss of the driving force occurs. Further, the device configuration of the component with the ultrasonic motor can be reduced in size.

  As described above, according to the present invention, the driving force is applied by pressing against one of the inner cylinder and the outer cylinder so that the power transmission mechanism is not required, so that the apparatus configuration can be reduced in size.

  In addition, since the driving force is applied by directly contacting one of the inner cylinder and the outer cylinder, the output is maintained and no output transmission loss occurs.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. (Embodiment 1)
1 shows a block diagram of a component with an ultrasonic motor according to Embodiment 1 to which the present invention is applied, FIG. 2 shows a cross-sectional structure of the component with an ultrasonic motor, and FIG. 3 shows a structure of the ultrasonic motor. (A) shows a planar structure and (b) shows a side structure. FIG. 4 shows the planar structure of each piezoelectric element, and FIG. 5 shows the operating principle of the ultrasonic motor. As shown in FIGS. 1 and 2, the ultrasonic motor-equipped component includes an outer cylinder portion 11 as an outer cylinder of the present invention, and an inner cylinder portion as an inner cylinder of the present invention provided inside the outer cylinder portion 11. 12, the movement guide portion 13 provided in the gap between the outer cylinder portion 11 and the inner cylinder portion 12, and the diameter direction of the inner cylinder portion 12 in the gap between the outer cylinder portion 11 and the inner cylinder portion 12. The ultrasonic motor 20 is arranged so as to coincide with the direction and the longitudinal direction thereof coincides with the circumferential direction of the inner cylinder portion 12, and pressurization that supports and pressurizes the ultrasonic motor 20 fixed to the inner circumferential surface of the outer cylinder portion 11. It is comprised from the support part 14. As shown in FIG.

  Thus, since the ultrasonic motor 20 is provided in the gap between the outer cylinder part 11 and the inner cylinder part 12, there is no need to provide a new installation space, and the outer cylinder part 11 and the inner cylinder part 12 are made thin. can do.

  Here, both the outer cylinder part 11 and the inner cylinder part 12 are cylindrical bodies, while the base end part of the outer cylinder part 11 is fixed, and the inner cylinder part 12 is rotatably provided.

  The movement guide portion 13 is a spherical body having a diameter corresponding to the gap between the outer cylinder portion 11 and the inner cylinder portion 12, and rotates with the rotation of the inner cylinder portion 12 to guide the rotation of the spherical body. .

  The pressure support portion 14 is made of, for example, rubber, a coil spring, or the like, and supports a node portion of the elastic body 21 and causes the elastic body 21 to move to the inner cylinder portion when a bending vibration wave is generated in the elastic body 21 described later. 12 is pressed in the radial direction, and an output take-out portion 22 described later is brought into pressure contact with the outer peripheral surface of the inner cylinder portion 12.

  The ultrasonic motor 20 includes an elastic body 21 having a piezoelectric element 30 as a piezoelectric vibrator of the present invention, and an output extraction portion 22 fixed to the lower surface of the elastic body 21.

  Specifically, as shown in FIG. 3, the elastic body 21 includes a first piezoelectric element 31, a second piezoelectric element 32 as the first piezoelectric vibrator of the present invention, 3, the fourth piezoelectric element 34 as the second piezoelectric vibrator of the present invention, the fifth piezoelectric element 35, and the sixth piezoelectric element as the first piezoelectric vibrator of the present invention. 36 and a seventh piezoelectric element 37 are integrally laminated in the thickness direction.

  In FIG. 4A, the first piezoelectric element 31 is used for excitation signal input, and on the surface, the first input electrode pattern 41a, 41a, 41a, 41a is formed on one long side edge, The second input electrode pattern 41b, 41b, 41b, 41b at the edge of the other long side, the third input electrode pattern 41c at one edge of the center, and the other edge of the center A fourth input electrode pattern 41d is formed. Moreover, each electrode pattern 41a, 41b, 41c, 41d is continuously extended from the upper end to the lower end with respect to the side surface of the elastic body 21, as shown in FIG.

  In addition, (+) and (-) in the drawing are displayed corresponding to the direction of the polarization treatment of the polarization part that forms the electrode pattern to be connected, which will be described later.

  As shown in FIG. 4B, the second piezoelectric element 32 has four polarization portions that are alternately polarized in the thickness direction along the longitudinal direction, and corresponds to each polarization portion. Thus, a first electrode pattern 42a, a second electrode pattern 42b, a third electrode pattern 42c, and a fourth electrode pattern 42d are formed. Here, (+) and (−) indicate the polarization treatment direction in the thickness direction of each polarization part. Each electrode pattern 42 a, 42 b, 42 c, 42 d protrudes partly to one long side and is connected to the first input electrode pattern 41 a of the first piezoelectric element 31.

  As shown in FIG. 4C, the third piezoelectric element 33 has a counter electrode pattern 43 formed on almost the entire surface as a counter electrode of each electrode pattern 42a, 42b, 42c, 42d of the second piezoelectric element 32. Yes. The counter electrode pattern 43 is connected to the third input electrode pattern 41 c of the first piezoelectric element 31 with a part protruding to the edge of one long side.

  As shown in FIG. 4D, the fourth piezoelectric element 34 has a polarization portion that is polarized almost entirely in the thickness direction, and forms an electrode pattern 44 corresponding to the polarization portion. This electrode pattern 44 is partially connected to the other long side and connected to the fourth input electrode pattern 41 d of the first piezoelectric element 31.

  As shown in FIG. 4E, the fifth piezoelectric element 35 forms a counter electrode pattern 45 as a counter electrode of the electrode pattern 44 of the fourth piezoelectric element 34. The electrode pattern 45 is connected to the third input electrode pattern 41 c of the first piezoelectric element 31 with a part protruding to one long side.

As shown in FIG. 4F, the sixth piezoelectric element 36 has four polarization portions that are alternately polarized in the thickness direction along the longitudinal direction, and corresponds to each polarization portion. The first electrode pattern 46a, the second electrode pattern 46b, the third electrode pattern 46c, and the fourth electrode pattern 46d are formed. Here, the direction of the polarization treatment of each polarization part is opposite to that of the second piezoelectric element 32. Each electrode pattern 46 a, 46 b, 46 c, 46 d is connected to the second input electrode pattern 41 b of the first piezoelectric element 31 with a part protruding to the other long side.

  The seventh piezoelectric element 37 forms a counter electrode pattern 47 as a counter electrode of each electrode pattern 46 a, 46 b, 46 c, 46 d of the sixth piezoelectric element 36. The counter electrode pattern 47 is connected to the third input electrode pattern 41 c of the first piezoelectric element 31 with a part protruding to one long side.

In place of the first piezoelectric element 31, an insulating elastic material such as hard rubber may be used.

As shown in FIG. 3B, the output extraction unit 22 includes a first output extraction unit 22 a provided in the longitudinal direction of the elastic body 21 and a second output extraction unit 22 b, and is generated in the elastic body 21. The frictional force is applied to the inner cylinder portion 12 by expanding the elliptical vibration.

Thus, since the output extraction part 22 is directly press-contacted with the inner cylinder part 12, it is not necessary to provide a power transmission mechanism, and size reduction of an apparatus structure is achieved.

  Next, the operation of this ultrasonic motor will be described based on FIG. 2, FIG. 4, and FIG.

  First, when it is desired to rotate the inner cylinder portion 12 in one direction, the first input electrode pattern 41a, the third input electrode pattern 41c, and the fourth input electrode of the first piezoelectric element 31 shown in FIG. An excitation signal may be input to the electrode pattern 41d.

At this time, the second piezoelectric element 32 generates a bending vibration wave in the thickness direction as shown by line A in FIG. 5, and the fourth piezoelectric element 34 has a longitudinal direction as shown by line B in FIG. Generates stretching vibration waves. The elastic body 21 generates an elliptical vibration as shown by a line C in FIG. 6 in which a bending vibration wave and a stretching vibration wave are combined, and each output extraction unit 22a, 22b expands the elliptical vibration.

  Here, in FIG. 2, the output take-out part 22 is pressurized by the pressure support part 14, is pressed against the inner cylinder part 12 in the radial direction, and the friction force as a driving force in the circumferential direction is applied to the inner cylinder part 12. Add Thereby, the inner cylinder part 12 rotates to one direction.

  At this time, the output take-out part 22 presses against the inner cylinder part 12 and directly applies a frictional force, so that no transmission loss of the driving force occurs.

  On the other hand, when it is desired to rotate the inner cylinder portion 12 in the reverse direction, the second input electrode pattern 41b, the third input electrode pattern 41c, and the fourth input electrode pattern 41d of the first piezoelectric element 31 are used. An excitation signal may be input to the.

  At this time, the sixth piezoelectric element 36 generates a bending vibration wave that is 180 ° out of phase with respect to the A line in FIG. 5, and the fourth piezoelectric element 34 generates a stretching vibration wave indicated by the B line in FIG. . Each part of the elastic body 21 generates elliptical vibration in the direction opposite to the C line in FIG. 5 by combining the bending vibration wave and the stretching vibration wave. Here, in FIG. 2, the output take-out part 22 applies a frictional force in the opposite circumferential direction to the inner cylinder part 12. Thereby, the inner cylinder part 12 rotates in the reverse direction.

  As described above, according to the present embodiment, since the ultrasonic motor 20 is provided in the gap between the outer cylinder portion 11 and the inner cylinder portion 12, there is no need to provide a new installation space, and the outer cylinder, the portion 11, The thickness of the inner cylinder part 12 can be made thin.

  Further, since the driving force is applied by being brought into pressure contact with the inner cylinder portion 12, no power transmission mechanism is required, and transmission loss of the driving force does not occur.

  Therefore, the apparatus configuration can be reduced in size, the output is maintained, and no output transmission loss occurs.

  The present embodiment may be modified as follows.

FIG. 6 is a diagram showing a deformation mode of a component with an ultrasonic motor.
In the component with the ultrasonic motor, the ultrasonic motor 20 is provided in the gap between the outer tube portion 11 and the inner tube portion 12, the thickness direction is directed to the radial direction of the inner tube portion 12, and the longitudinal direction is the length of the inner tube portion 12. It is arranged in the direction. Moreover, the inner cylinder part 12 is provided so that the movement to a longitudinal direction is possible.

According to this, since the output take-out part 22 applies a driving force in the longitudinal direction to the inner cylinder 12, the inner cylinder 12 advances and retracts in the longitudinal direction with respect to the outer cylinder 11.
(Embodiment 2)
FIG. 7 is a view showing a component with an ultrasonic motor according to Embodiment 2 to which the present invention is applied, FIG. 8 shows the structure of the ultrasonic motor, (a) is a planar structure, and (b) is a plan view. FIG. 9 is a diagram showing a planar structure of each piezoelectric element.
FIG. 10 shows the operating principle of the ultrasonic motor.

The components with an ultrasonic motor include an outer cylinder part 51 as an outer cylinder of the present invention, an inner cylinder part 52 as an inner cylinder of the present invention provided inside the outer cylinder part 51, an outer cylinder part 51 and an inner cylinder. The movement guide portion 13 provided in the gap with the portion 52 and the gap between the outer cylinder portion 51 and the inner cylinder portion 52 are similarly made to have the thickness direction coincide with the radial direction of the inner cylinder portion 52 and the longitudinal direction is the inner cylinder. The ultrasonic motor 60 is disposed so as to coincide with the longitudinal direction of the portion 52, and the pressure support portion 54 that is fixed to the inner peripheral surface of the outer cylinder portion 51 and supports and pressurizes the ultrasonic motor 60.

  Here, the inner cylinder part 52 includes a cylindrical inner cylinder part main body 52a and an outer flange part 52b extending from the edge of the inner cylinder part main body 52a in the outer diameter direction. It is provided so as to be rotatable in the direction. On the other hand, the outer cylinder part 52b is the same structure as the outer cylinder part 11b concerning Embodiment 1, and has fixed one base end.

  The pressure support portion 54 is made of, for example, rubber, a coil spring, or the like. When a bending vibration wave is generated in the elastic body 61 described later, the pressure support portion 54 supports the vicinity of a node portion of the elastic body 61 and the elastic body 61 with the inner cylinder. Pressure is applied in the longitudinal direction of the main part 52 a, and an output take-out part 62 described later is brought into pressure contact with the outer flange part 52 b of the inner cylinder part 52.

  As shown in FIG. 8, the ultrasonic motor 60 includes an elastic body 61 having a piezoelectric element as a piezoelectric vibrator of the present invention, and an output extraction portion 62 fixed to the side surface of the elastic body 61.

  The elastic body 61 includes a rectangular piezoelectric first piezoelectric element 71, a second piezoelectric element 72 as a first piezoelectric vibrator of the present invention, a third piezoelectric element 73, and a first piezoelectric element of the present invention. In this structure, the fourth piezoelectric element 74 as the second piezoelectric vibrator is integrally laminated in the thickness direction.

  Specifically, the first piezoelectric element 71 is used for inputting an excitation signal in FIG. 9A, and the first input electrode patterns 81a and 81a are formed on the edge of one long side of the surface, and the other Second input electrode patterns 81b and 81b at the edge of the long side, a third input electrode pattern 81c at one edge of the central portion, and a fourth input electrode at the other edge of the central portion. An electrode pattern 81d is formed. Each electrode pattern 81a, 81b, 81c, 81d extends continuously from the upper end to the lower end with respect to the side surface of the elastic body 61, as shown in FIG.

  Note that (+) in the drawing indicates the direction of the polarization processing of the polarization part that forms the electrode pattern to be connected, which will be described later.

  As shown in FIG. 9B, each of the second piezoelectric elements 72 has a polarization portion that is divided into four rectangular shapes, and each polarization portion has an adjacent polarization direction in the same direction. Polarized in the thickness direction. In addition, first electrode patterns 82a and 82b and second electrode patterns 82c and 82d are formed corresponding to each polarization part. Here, (+) indicates the direction of polarization treatment in the thickness direction.

  Further, the first electrode patterns 82 a and 82 b partially protrude to the adjacent long sides of the second piezoelectric element 72 and are connected to the first input electrode patterns 81 a and 81 a of the first piezoelectric element 71. is doing. Each of the second electrode patterns 82c and 82d protrudes partly to the adjacent long side of the second piezoelectric element 72 and is connected to the second input electrode patterns 81b and 81b of the first piezoelectric element 81. Yes.

  As shown in FIG. 9C, the third piezoelectric element 73 has a counter electrode pattern 83 formed on almost the entire surface as a counter electrode of each electrode pattern 82a, 82b, 82c, 82d of the second piezoelectric element 72. Yes. In addition, the electrode pattern 83 for the counter electrode projects partly to one long side of the piezoelectric element 73 and is connected to the third input electrode pattern 81 c of the first piezoelectric element 71.

  As shown in FIG. 9D, the fourth piezoelectric element 74 has a polarization portion that is polarized almost entirely in the thickness direction, and an electrode pattern 84 is formed corresponding to the polarization portion. This electrode pattern 84 is partially connected to the other long side of the piezoelectric element 74 and connected to the fourth input electrode pattern 81 d of the first piezoelectric element 71.

Next, a method of using a component with an ultrasonic motor will be described based on FIG. 7, FIG. 9, and FIG.
First, when it is desired to rotate the inner cylinder portion 52 in one direction, the first input electrode pattern 81a, the third input electrode pattern 81c, and the fourth input electrode of the first piezoelectric element 71 shown in FIG. An excitation signal may be input to the electrode pattern 81d.

  At this time, the second piezoelectric element 72 generates a bending vibration wave in the width direction as shown by line C in FIG. 10, and the fourth piezoelectric element 84 is in the longitudinal direction as shown by line D in FIG. Generates stretching vibration waves. Each part of the elastic body 61 generates an elliptical vibration by synthesizing a bending vibration wave and a stretching vibration wave, and the output extraction unit 62 expands the elliptical vibration as shown by line E in FIG.

  Here, in FIG. 7, the output take-out portion 62 is pressurized in the longitudinal direction of the inner cylinder portion main body 52 a by the pressure support portion 54, and is in pressure contact with the outer flange portion 52 b of the inner cylinder portion 52. The inner cylindrical portion 52 is applied with a frictional force as a driving force in the circumferential direction by the output extraction member 62. Thereby, the inner cylinder part 12 rotates to one direction.

  At this time, the output take-out part 62 directly presses against the outer flange part 52b of the inner cylinder part 52 to apply a frictional force, so that no transmission loss of the driving force occurs.

  On the other hand, when it is desired to rotate the inner cylinder portion 12 in the reverse direction, the second input electrode pattern 81b, the third input electrode pattern 81c, and the fourth input of the first piezoelectric element 71 shown in FIG. An excitation signal may be input to the electrode pattern 81d.

At this time, the second piezoelectric element 72 generates a bending vibration wave that is 180 ° out of phase with respect to the C line in FIG. 10, and the fourth piezoelectric element 74 generates a stretching vibration wave indicated by the D line in FIG. . The output extraction unit 62 of the elastic body 61 generates elliptical vibration in the direction opposite to the line E in the figure by combining the bending vibration wave and the stretching vibration wave.
Here, in FIG. 7, the output take-out portion 62 applies a friction force in the opposite circumferential direction to the outer flange portion 52 b of the inner cylinder portion 62. Thereby, the inner cylinder part 62 is rotated in the reverse direction.

As described above, according to the present embodiment, the same effect as in the first embodiment can be obtained, and the ultrasonic motor 60 can be used with respect to the outer flange portion 52b of the inner cylinder portion 52. While being pressed in the longitudinal direction of the main body 52 a and applying a driving force in the circumferential direction of the inner cylinder portion 52, the inner cylinder portion 52 is rotated relative to the outer cylinder portion 51. (Embodiment 3)
FIG. 11 shows a block diagram of a component with an ultrasonic motor according to Embodiment 3 to which the present invention is applied, and FIG. 12 shows a cross-sectional structure of the component with an ultrasonic motor. The component with an ultrasonic motor has substantially the same configuration as that of the first embodiment, and in the gap between the outer cylinder portion 11 and the inner cylinder portion 12, the thickness direction is made to coincide with the radial direction of the inner cylinder portion 12, and the longitudinal direction is set. The ultrasonic motor 20 is disposed so as to coincide with the circumferential direction of the inner cylindrical portion 12, and the pressure support portion 14 is fixed to the outer peripheral surface of the outer cylindrical portion 11 to support and pressurize the ultrasonic motor 20. It is characterized by.

  In the following description, the same components are denoted by the same reference numerals and description thereof is omitted.

  Here, the base end part of the outer cylinder part 11 is fixed, and the inner cylinder part 12 is provided rotatably. The pressurizing support portion 14 supports the vicinity of the node portion of the bending vibration wave with respect to the elastic body 21 and pressurizes the elastic body 21 in the radial direction of the outer cylinder portion 11 to remove the output takeout portion 22 described later. It is brought into pressure contact with the inner peripheral surface of the cylindrical portion 12.

According to this, in addition to obtaining the same effect as in the first embodiment, the ultrasonic motor 20 is pressed against the inner peripheral surface of the outer cylinder portion 11 in the radial direction and applies a driving force in the circumferential direction. Therefore, the outer cylinder part 12 is rotated relative to the inner cylinder part 11.
(Embodiment 4)
FIG. 13 is a diagram showing a cross-sectional structure of a component with an ultrasonic motor according to the fourth embodiment to which the present invention is applied.

  The components with an ultrasonic motor include an outer cylinder part 91 as an outer cylinder of the present invention, an inner cylinder part 92 as an inner cylinder of the present invention provided inside the outer cylinder part 91, an outer cylinder part 91 and an inner cylinder. The ultrasonic motor 20 is disposed in the gap with the portion 92 such that the thickness direction thereof coincides with the radial direction of the inner cylinder portion 92 and the longitudinal direction thereof coincides with the longitudinal direction of the inner cylinder portion 92. It is characterized in that it is constituted by a pressurizing support portion 14 that is fixed to and supports and pressurizes the ultrasonic motor 20.

  Here, the inner cylinder part 92 is a cylindrical body, and the outer cylinder part 91 includes a cylindrical outer cylinder part main body 91a and an inner flange part 91b extending in the inner diameter direction from one end of the outer cylinder part main body 91a. Become. The outer cylinder portion 91 is provided so as to be movable in the longitudinal direction, and the base end of the inner cylinder portion 92 is fixed.

  According to this, in addition to the same effects as those of the first embodiment, the ultrasonic motor 20 applies a frictional force in the longitudinal direction to the outer cylinder main body 91a. On the other hand, the outer cylinder part 91 is relatively advanced and retracted in the longitudinal direction.

  The present embodiment may be modified as follows.

  FIG. 14 is a diagram showing a cross-sectional structure of a modified embodiment according to the fourth embodiment. That is, in the component with the ultrasonic motor, in the gap between the outer cylinder portion 91 and the inner cylinder portion 92, the thickness direction is made to coincide with the radial direction of the inner cylinder portion 92, and the longitudinal direction is made to coincide with the longitudinal direction of the inner cylinder portion 92. The ultrasonic motor 60 and the pressure support portion 54 that supports and pressurizes the ultrasonic motor 60 while being fixed to the outer peripheral surface of the inner cylinder portion 92 are characterized.

  Here, the ultrasonic motor 60 is pressurized in the longitudinal direction of the inner tube portion 92 by the pressure support portion 54 and is pressed against the inner flange portion 91 b of the outer tube portion 91.

According to this, since the ultrasonic motor 60 applies a frictional force in the circumferential direction to the inner flange portion 91b of the outer tube portion 91, the outer tube portion 91 is relatively moved with respect to the inner tube portion 92. Rotate.
(Embodiment 5)
FIG. 15 is a block diagram of a fifth embodiment in which the ultrasonic component according to the present invention is applied to an electronic device.

  The electronic apparatus supports the elastic body 94 having the piezoelectric element 93 as described above, the inner cylinder portion and the outer cylinder portion 95 that are relatively movable by the elastic body 94, and the elastic body 94. Pressure support means 96 that pressurizes the inner cylinder portion and the outer cylinder portion 95, a transmission mechanism 97 that moves in conjunction with the inner cylinder portion and the outer cylinder portion 95, and an output mechanism that moves based on the operation of the transmission mechanism 97. This is realized by providing 98.

  Here, the electronic apparatus includes a camera autofocus, a video lens, an iris, a microscope, an endoscope, and the like.

  For the transmission mechanism 97, for example, a gear, a feed claw or the like is used. As the output mechanism 98, for example, a shutter drive mechanism and a lens drive mechanism are used in a camera, a pointer drive mechanism and a calendar drive mechanism are used in an electronic timepiece, and a cutting tool feed mechanism and a machining member feed mechanism are used in a machine tool.

  If the output shaft is attached to the inner cylinder portion and the outer cylinder portion 95 and a power transmission mechanism is provided that transmits torque from the output shaft, the drive mechanism is realized because of the simple configuration.

The block diagram of the components with an ultrasonic motor concerning Embodiment 1 to which this invention is applied is shown. It is explanatory drawing which shows the cross-section of the components with an ultrasonic motor concerning FIG. The structure of the ultrasonic motor concerning FIG. 1 is shown, (a) shows a planar structure, (b) shows a side structure. It is explanatory drawing which shows the planar structure of each piezoelectric element concerning FIG. It is explanatory drawing which shows the operation principle of the ultrasonic motor concerning FIG. It is a figure which shows the cross-section which shows the aspect of a deformation | transformation concerning FIG. It is a block diagram which shows the components with an ultrasonic motor concerning Embodiment 2 to which this invention is applied. The structure of the ultrasonic motor concerning FIG. 7 is shown, (a) is a planar structure, (b) is explanatory drawing which shows a side structure. It is explanatory drawing which shows the planar structure of each piezoelectric element concerning FIG. It is explanatory drawing which shows the operation | movement principle of the ultrasonic motor concerning FIG. The block diagram of the components with an ultrasonic motor concerning Embodiment 3 to which this invention is applied is shown. It is explanatory drawing which shows the cross-section of the components with an ultrasonic motor concerning FIG. It is explanatory drawing which shows the cross-section of the components with an ultrasonic motor concerning Embodiment 4 to which this invention is applied. It is explanatory drawing which shows the cross-section of the aspect of a deformation | transformation concerning FIG. The block diagram of Embodiment 5 which applied the component with the ultrasonic wave concerning this invention to the electronic device is shown. It is explanatory drawing which shows the cross-section of the camera which moves an inner cylinder and an outer cylinder relatively using the ultrasonic motor concerning a 1st prior art example. It is explanatory drawing which shows the cross-section of the camera which moves an inner cylinder and an outer cylinder relatively using the ultrasonic motor concerning a 2nd prior art example.

Explanation of symbols

11 Outer tube (outer tube)
12 Inner cylinder (inner cylinder)
20 Ultrasonic motor 32 Second piezoelectric element (first piezoelectric vibrator)
34 Fourth piezoelectric element (second piezoelectric vibrator)
36 Sixth piezoelectric element (first piezoelectric vibrator)
51 Outer tube (outer tube)
52 Inner cylinder (inner cylinder)
52b Outer part 60 Ultrasonic motor 72 Second piezoelectric element (first piezoelectric vibrator)
74 Fourth piezoelectric element (second piezoelectric vibrator)
91 Outer tube (outer tube)
91b Inner collar

Claims (8)

A cylindrical outer cylinder having a lens inside, a cylindrical inner cylinder provided inside the outer cylinder, and a rectangular piezoelectric vibration provided in a radial gap between the outer cylinder and the inner cylinder In a driving part of a lens with an ultrasonic motor provided with a child,
The inner cylinder has an outer flange portion protruding in a radial direction that is the direction of the outer cylinder from an outer peripheral surface;
The piezoelectric vibrator has a node portion supported on the inner peripheral surface of the outer cylinder, is pressed against the outer flange portion of the inner cylinder in the longitudinal direction of the inner cylinder, and is driven in the circumferential direction of the inner cylinder. A driving part for a lens with an ultrasonic motor, which applies force. A cylindrical outer cylinder, a cylindrical inner cylinder having a lens provided inside the outer cylinder, and a rectangular piezoelectric vibration provided in a radial gap between the outer cylinder and the inner cylinder In a driving part of a lens with an ultrasonic motor provided with a child,
The outer cylinder has an inner flange portion that protrudes from an inner peripheral surface in a radial direction that is the direction of the inner cylinder,
The piezoelectric vibrator has a node portion supported on the outer peripheral surface of the inner cylinder, is pressed against the inner flange portion of the outer cylinder in the longitudinal direction of the outer cylinder, and is driven in the circumferential direction of the outer cylinder. A driving part of a lens with an ultrasonic motor, characterized by adding The super guide according to claim 1, wherein a movement guide portion that guides relative movement between the outer cylinder and the inner cylinder is provided between the outer cylinder and the inner cylinder. Driving parts for lenses with sonic motors. The drive part of the lens with an ultrasonic motor according to any one of claims 1 to 3, wherein an output extraction portion is provided in a portion of the piezoelectric vibrator that is in pressure contact with the outer cylinder or the inner cylinder. . 5. The piezoelectric vibrator according to claim 1, wherein the piezoelectric vibrator is configured by integrally laminating a plurality of piezoelectric elements in a thickness direction, and generates a bending vibration wave and a stretching vibration wave. Driving parts for lenses with ultrasonic motors. The piezoelectric vibrator includes at least a flat plate-like first piezoelectric vibrator that generates a bending vibration wave and a flat plate-like second piezoelectric vibrator that generates a stretching vibration wave, and the first piezoelectric vibrator; 6. The driving component for a lens with an ultrasonic motor according to claim 5, wherein the second piezoelectric vibrator is integrally laminated in the thickness direction. The driving of a lens with an ultrasonic motor according to any one of claims 1 to 6, wherein the piezoelectric vibrator is provided so that a thickness direction of the piezoelectric vibrator coincides with a radial direction of the outer cylinder and the inner cylinder. parts. An electronic device using the driving component for a lens with an ultrasonic motor according to claim 1.

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