JP5927977B2 - Actuator device, lens barrel and camera - Google Patents

Description

  The present invention relates to an actuator device mounted on a lens barrel mounted on an electronic camera or the like, a lens barrel, and a camera.

In recent cameras, the number of images on the CCD has increased, and the images are often stretched very greatly. Therefore, the lens barrel is required to have better contrast and sharpness and higher AF accuracy.
Conventionally, in order to improve the positional accuracy of a lens in a lens barrel, a method of dividing a vibration actuator that performs lens driving into coarse motion driving and fine motion driving has been disclosed (for example, see Patent Document 1).

JP 2001-161081 A

  However, in the conventional method, since the fine movement drive is a burst drive, a burst sound is generated, and the silence that is a feature of the vibration actuator drive is impaired. In addition, there is a problem that it takes time until positioning because of the method of fine movement after coarse movement.

  An object of the present invention is to provide an actuator device, a lens barrel, and a camera that improve AF accuracy, are quiet, and can position an AF lens in a short time.

The present invention is, that solve the problems by following such a solution.

The actuator device, that by a first actuator for moving the moving member by by that driving force to the first electromechanical transducer voltage to repeatedly change is applied, to the second electromechanical transducer DC voltage is applied driven A second actuator that moves the moving body by force, and the first actuator moves the moving body, and the second actuator moves the moving body by a movement amount smaller than a movement amount of the first actuator. It was set as the structure provided with a control part .
Further, the lens barrel includes the actuator device, and is a lens barrel that can be attached to and detached from the camera body, wherein the movable body is a lens group, and when receiving a signal for taking a still image from the camera body, The second actuator is driven.
Furthermore, the camera is configured to include the lens barrel.

  According to the present invention, it is possible to provide an actuator device, a lens barrel, and a camera that improve the AF accuracy, can be positioned silently, and can position the AF lens in a short time.

It is a figure explaining the electronic camera of 1st embodiment. It is a figure explaining the lens-barrel of 1st embodiment. It is a perspective view of an elastic body and a mover. It is a figure explaining the 2nd actuator of 1st embodiment, (a) is voltage = 0V, (b) is-to terminal A, terminal B is set to GND, (c) is the state shrunk in the optical axis direction, The terminal A is +, the terminal B is GND, and is extended in the optical axis direction. It is a figure explaining arrangement | positioning of a 2nd actuator. It is a block diagram explaining the actuator device of the 1st actuator of the first embodiment, and the 2nd actuator. It is a flowchart explaining the lens drive control of the actuator apparatus of 1st embodiment. It is a flowchart explaining the lens drive control of the actuator apparatus of 2nd embodiment. It is a flowchart explaining the lens drive control of the actuator apparatus 160 of 3rd embodiment. It is a figure explaining the lens-barrel of 5th embodiment of this invention. It is a figure explaining the 1st actuator of 5th embodiment. It is a figure explaining operation | movement of the 1st actuator of 5th embodiment.

(First embodiment)
Hereinafter, a first embodiment of an electronic camera including an actuator device according to the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a diagram illustrating an electronic camera 1 including the actuator device of the first embodiment.
The electronic camera 1 includes an imaging optical system (lens barrel) 20 and a camera body 40. The camera body 40 includes an imaging device 30, an AFE (Analog front end) circuit 60, an image processing unit 70, and a sound detection unit 80. Furthermore, the electronic camera 1 includes an operation member 90, a buffer memory 110, a recording interface 120, a memory 130, a monitor 140, and a CPU 100, and can be connected to a PC 150 as an external device.

  The lens barrel 20 is composed of a plurality of optical lens groups, and forms a subject image on the light receiving surface of the image sensor 30. In FIG. 1, the optical lens system is simplified and illustrated as a single lens. As will be described later, in the optical lens system, the driving unit of the optical lens L1 for AF has a structure in which the second actuator 50 is mounted on the moving element 15 of the first actuator 10.

The image sensor 30 is configured by a CMOS image sensor or the like in which light receiving elements are two-dimensionally arranged on a light receiving surface. The image sensor 30 photoelectrically converts the subject increase caused by the light beam that has passed through the imaging optical system 20 to generate an analog image signal. The analog image signal is input to the AFE circuit 60.
The exposure time (shutter speed) to the image sensor 30 is determined by the operation member 90 or the state of the image.

  The AFE circuit 60 performs gain adjustment (signal amplification according to ISO sensitivity) for the analog image signal. Specifically, the imaging sensitivity is changed within a predetermined range in accordance with a sensitivity setting instruction from the CPU 100. The AFE circuit 60 further converts the image signal after analog processing into digital data by a built-in A / D conversion circuit. The digital data is input to the image processing unit 70.

  The image processing unit 70 performs various types of image processing on the digital image data.

  The sound detection unit 80 includes a microphone and a signal amplification unit, detects and captures sound from the subject direction mainly during moving image shooting, and transmits the data to the CPU 100. The voice detection unit 80 may be a built-in microphone of the electronic camera 1 or an external microphone attached to the contact point of the electronic camera 1. When an external microphone is attached, it can be detected.

The operation member 90 indicates a mode dial, a cross key, an enter button, and a release button, and sends an operation signal corresponding to each operation to the CPU 100.
Selection of still image shooting or moving image shooting is also performed by the operation member 90, and an operation signal corresponding to the selection operation is sent to the CPU 100.

  The CPU 100 comprehensively controls operations performed by the electronic camera 1 by executing a program stored in a ROM (not shown). For example, AF (autofocus) operation control, AE (automatic exposure) operation control, auto white balance control, and the like are performed.

The buffer memory 110 temporarily records image data in the pre-process and post-process of image processing by the image processing unit 70.
The recording interface 120 has a connector (not shown), and a recording medium is connected to the connector, and data is written to and read from the connected recording medium.

The memory 130 records a series of image data subjected to image processing.
In the electronic camera 1 having such a configuration, the present invention captures an image corresponding to a moving image.
The monitor 140 is composed of a liquid crystal panel, and displays an image, an operation menu, and the like according to an instruction from the CPU 100.

  FIG. 2 is a diagram illustrating the lens barrel 20 according to the first embodiment of the present invention, and is a diagram showing a state in which the first actuator 10 and the second actuator 50 are incorporated in the lens barrel 20.

First, the configuration of the first actuator 10 will be described.
The vibrator 11 includes an electromechanical conversion element (hereinafter, referred to as a piezoelectric body) 13 such as a piezoelectric element or an electrostrictive element that converts electrical energy into mechanical energy, and an elastic body 12 to which the piezoelectric body 13 is bonded. It is configured. Although a traveling wave is generated in the vibrator 11, this embodiment will be described as a traveling wave of 9 waves as an example.

  The elastic body 12 is made of a metal material having a high resonance sharpness, has an annular shape as shown in FIG. 3, and has a groove cut on the opposite surface to which the piezoelectric body 13 is joined. The tip end surface of the protruding portion (the portion where there is no groove) becomes the driving surface 12a and is brought into pressure contact with the sliding surface 15a of the moving element 15. The reason for cutting the groove is to make the neutral surface of the traveling wave as close to the piezoelectric body 13 as possible, thereby amplifying the amplitude of the traveling wave on the drive surface 12a. The surface of the drive surface 12a of the elastic body 12 is provided with a lubricating coating film for ensuring drive performance and improving durability.

  The piezoelectric body 13 is divided into two phases (A phase and B phase) along the circumferential direction. In each phase, elements in which polarization is alternated are arranged every ½ wavelength, and an interval of ¼ wavelength is left between the A phase and the B phase.

  The piezoelectric body 13 is generally made of a material such as lead zirconate titanate, commonly called PZT. In recent years, lead-free materials such as potassium sodium niobate, potassium niobate, and sodium niobate are used because of environmental problems. , Barium titanate, bismuth sodium titanate, potassium bismuth titanate and the like.

A non-woven fabric 16, a pressure plate 17, and a pressure member 18 are disposed on the opposite side of the piezoelectric body 13 from the side where the mover 15 is disposed.
The nonwoven fabric 16 is an example of felt, and is disposed adjacent to the piezoelectric body 13 to prevent the vibration of the vibrating body from being transmitted to the pressure plate 17 and the pressure member 18.

The pressure plate 17 is pressurized by the pressure member 18.
The pressure member 18 is disposed below the pressure plate 17 and generates pressure. In this embodiment, the pressure member 18 is a disc spring, but it may be a coil spring or a wave spring instead of a disc spring. The pressure member 18 is held by being fixed to the fixing member 21 via the pressing ring 19.

The mover 15 is made of a light metal such as aluminum, and a sliding material for improving wear resistance is provided on the surface of the sliding surface 15a (see FIG. 3).
A vibration absorbing member 22 made of rubber or the like is disposed on the opposite side of the moving element 15 from the vibrator side, and an output transmission member 23 is further disposed to absorb vibrations in the vertical direction of the moving element 15.

The output transmission member 23 regulates the pressurization direction and the radial direction by a bearing 24 provided on the fixed member 21, thereby regulating the pressurization direction and the radial direction of the moving element 15. .
The output transmission member 23 has a protrusion 25, and a fork 27 connected to the cam ring 26 is engaged with the protrusion 25, and the cam ring 26 is rotated as the output transmission member 23 rotates. .

  A key groove 26a is obliquely cut in the cam ring 26, and a fixing pin 28a provided in the AF ring 28 is engaged with the key groove 26a. The AF ring 28 is driven in the straight direction in the axial direction and can be stopped at a desired position. A second actuator 50 is mounted on the AF ring 28.

  The holding ring 19 is attached to the fixing member 21 with a screw, and by attaching this, the components from the output transmission member 23 to the moving element 15, the vibrator 11, and the spring can be configured as one motor unit.

Next, the second actuator 50 mounted on the AF ring 28 will be described.
The second actuator 50 is provided between the AF ring 28 and the AF lens holding unit 29. The second actuator 50, the AF ring 28, and the AF lens holding portion 29 are driven in the optical axis direction while rotating together.
Note that the lens barrel 20 of the present embodiment is a zoom lens and also includes a zoom lens group L2.

FIG. 4 is a diagram illustrating the second actuator 50 of the present embodiment.
Four layers of rectangular piezoelectric plates 51 whose polarization directions are processed in the thickness direction are stacked, and a voltage is applied between the thicknesses to expand and contract in the thickness direction.
FIG. 4A shows a state where the voltage = 0V. FIG. 4B shows a state in which the terminal A is − and the terminal B is GND and is contracted in the optical axis direction, and FIG. 4C is a state in which the terminal A is + and the terminal B is GND and is extended in the optical axis direction. Since the voltage and the expansion / contraction amount are substantially proportional, the expansion / contraction amount is controlled by the voltage value.

FIG. 5 is a view for explaining the arrangement of the second actuator 50.
Joined between the end face of the AF ring 28 and the end face of the AF lens holding portion 29, four places are provided.
In the present embodiment, the second actuator 50 has four layers, but the same effect can be achieved with dozens of layers such as six layers, eight layers,. If there are many layers and the thickness is small, a large amount of expansion and contraction can be obtained at a low voltage.

FIG. 6 is a block diagram illustrating an actuator device 160 including the first actuator 10 and the second actuator 50.
First, driving / control of the first actuator 10 will be described.

The oscillating unit 112 generates a drive signal having a desired frequency according to a command from the control unit 111.
The phase shifter 113 divides the drive signal generated by the oscillator 112 into two drive signals having different phases.
The first amplifying unit 114 boosts the two drive signals divided by the phase shift unit 113 to desired voltages, respectively.
A drive signal from the first amplifying unit 114 is transmitted to the first actuator 10, and a traveling wave is generated in the vibrator 11 by the application of the drive signal, so that the moving element 15 is driven.

  The detection unit 115 is configured by an optical encoder, a magnetic encoder, and the like, detects the position and speed of a driven object driven by driving the moving element 15, and transmits the detected value to the control unit 111 as an electric signal. Further, contrast information is also detected during moving image shooting and transmitted to the control unit 111.

The control unit 111 receives shooting information (such as a still image mode / moving image mode) and a drive command from the camera 1 and controls the drive of the first actuator 10 and the drive of the second actuator 50.
The control unit 111 performs frequency control for the oscillation unit 112, phase difference control for the phase shift unit 113, and voltage control for the first amplification unit 114 for the first actuator 10.
For the second actuator 50, voltage control to the DC generator 152 is performed.

  According to the configuration of the present embodiment, the actuator device 160 including the first actuator 10 and the second actuator 50 operates as follows.

(1) Coarse motion drive (first actuator 10)
First, when shooting information and focal length information from the camera 1 are transmitted, the first actuator 10 performs coarse movement driving of the lens L1.
In the coarse driving, a set frequency is transmitted from the control unit 111 to the oscillation unit 112 based on information from the lens barrel 20, the camera body 40, or the detection unit 115. A driving signal is generated from the oscillating unit 112, and the signal is divided into two driving signals having a phase difference of 90 degrees by the phase unit, and is amplified to a desired voltage by the first amplifying unit 114.

  The drive signal is applied to the piezoelectric body 13 of the first actuator 10 and the piezoelectric body 13 is excited, and the excitation causes the ninth-order bending vibration to occur in the elastic body 12. The piezoelectric body 13 is divided into an A phase and a B phase, and drive signals are applied to the A phase and the B phase, respectively.

  The positional difference between the 9th order bending vibration generated from the A phase and the 9th order bending vibration generated from the B phase is ¼ wavelength, and the A phase drive signal and the B phase drive signal are different from each other. Since the phase is shifted by 90 degrees, the two bending vibrations are combined into nine traveling waves.

  Elliptic motion occurs at the front of the traveling wave. Therefore, the moving element 15 brought into pressure contact with the driving surface 12a is frictionally driven by this elliptical motion. An optical encoder is disposed in the driving body driven by driving the moving element 15, and an electric pulse is generated therefrom and transmitted to the control unit 111.

The control unit 111 can obtain the current position and the current speed based on this signal, and the drive frequency of the oscillation unit 112 is controlled based on the position information, speed information, and target position information. .
When it is detected that the target position is almost reached, the first actuator 10 is stopped.

  In the case of driving in the forward direction, the phase difference between the two drive signals (frequency voltage signals) in the phase shift unit 113 is set to a positive value, for example, +90 degrees, and in the case of driving in the reverse direction, the phase shift unit. The phase difference between the two drive signals (frequency voltage signal) at 113 may be a negative value, for example, -90 degrees.

(2) Fine movement drive (second actuator)
After the driving of the first actuator 10 is completed, the difference between the target position and the current position is detected, and the DC voltage applied to the second actuator 50 is determined based on the detected value. When the target position is in the positive direction from the current position, a positive DC voltage is applied, and when the target position is in the negative direction from the current position, a negative DC voltage is applied.

  Since the second actuator 50 generates a displacement almost in proportion to the applied voltage, it is necessary to apply a large voltage value when the target position and the current position are large, and when the target position and the current position are small. Is a small voltage application. Further, when it is determined that there is no difference between the target position and the current position, voltage application is not necessary.

FIG. 7 is a flowchart illustrating lens drive control of the actuator device 160 according to the first embodiment. In the following description, a step is represented by S.
First, when the release button (operation member 90) of the camera 1 is half-pressed, the control unit 111 of the camera 1 receives the signal from the CPU 100 (S01).
The control unit 111 distinguishes between the moving image mode and the still image mode (S02). In the case of the moving image mode, the driving method is different (S02, YES). This embodiment is a driving method specific to the still image mode.
The control unit 111 receives a signal related to the AF lens target position (focus position) (S03).
The controller 111 turns on the first actuator 10 (S04).
The speed of the first actuator 10 is set and control is started (S05).
At each sampling time, the detection unit 115 detects the difference between the current position and the target position, and determines whether the target position has been reached (S06).
The speed of the first actuator 10 is determined according to the difference from the target position (S07).

  Here, since the first actuator 10 does not perform burst driving, it is not easy to accurately stop the lens L1 at the target position. For this reason, when the position of the lens L1 falls within a certain range including the target position, for example, a range that can be accepted as being focused by the depth of field (S06, YES), the first actuator 10 is stopped and the first actuator 10 is stopped. The power of one actuator 10 is turned off (S08).

Next, the difference between the target position of the lens L1 and the current position is detected (S09).
A voltage value to be applied to the second actuator 50 is determined from the difference between the target position detected in S09 and the current position (S10). Then, a voltage is applied to the second actuator 50 to displace it (S11), and the AF lens L1 is finely moved to move to the target position.

When the release 90 is fully pressed (S12, YES), a still image is captured (S13).
Thereafter, the power supply of the second actuator is turned off (S14).
In S12, if the release 90 is not fully pressed (S12, NO), the process ends if the half-press is released (S15, YES), and if the half-press is not released (S15, NO), the process proceeds to S12. Return.

  In this manner, the first actuator 10 and the second actuator 50 are provided, and the first actuator 10 performs coarse movement, and a slight difference from the target position of the AF lens is finely moved by the second actuator 50 for correction. Therefore, more advanced positioning is possible. According to the present embodiment, conventionally, the position of the AF lens L1 is acceptable as long as it is within the range of the depth of focus, but the AF lens L1 can be accurately positioned at the in-focus position.

  Further, the second actuator 50 has a high responsiveness, so that the displacement occurs in 1 msec or less after the voltage is applied. Therefore, the positioning time can be significantly shortened compared to the conventional method in which fine movement is driven by burst driving, and the driving can be performed more silently.

(Second embodiment)
FIG. 8 is a flowchart illustrating lens drive control of the actuator device 160 according to the second embodiment. The configuration of the actuator device of the second embodiment is the same as that of the first embodiment, but unlike the first embodiment, the time for applying a voltage to the second actuator 50 is limited during still image shooting. By doing so, power saving is achieved.

Since S201 to S210 are the same as S01 to S11 of the first embodiment, description thereof is omitted.
In the second embodiment, when the voltage value of the second actuator 50 is calculated (S210), it is determined whether or not the release 90 is fully pressed before applying the voltage to the second actuator 50 (S211). When it is fully pressed (S211, YES), a voltage is applied to the second actuator 50 to displace it (S212). Then, the AF lens L1 is finely moved, moved to the target position, and a still image is captured (S213).
Thereafter, the power supply of the second actuator is turned off (S214).

  If the release 90 is not fully pressed (S211, NO), the process ends if the half-press is released (S215, YES). If the half-press is not released (S215, NO), the process returns to S211.

  In the first embodiment, a voltage is always applied in order to generate a displacement in the second actuator 50. However, in the present embodiment, the second actuator 50 is driven only when an image is taken. Power saving can be achieved.

(Third embodiment)
FIG. 9 is a flowchart illustrating lens drive control of the actuator device 160 according to the third embodiment. In the present embodiment, it is assumed that a subject that moves while being half-pressed is continuously tracked. In the present embodiment, the lens L1 is coarsely moved by the first actuator 10 as in the first and second embodiments. After that, while the half-press is continued, the subject is followed, the detection of the difference between the new target position of the lens L1 that focuses on the subject and the current position is continued, and the lens L1 is driven by the second actuator 50. Keep doing.

Since S301 to S311 are the same as those in the first embodiment, description thereof is omitted.
In step S312, the control unit 111 determines whether the camera 1 is fully pressed. If it is fully pressed (S312, YES), a still image is captured (S313), and the power supply of the second actuator is turned off (S314).

In S312, if the camera 1 is not fully pressed (S312, NO), if the half-press is not released (S315, NO), a new target position is determined again (S316), and the process returns to S309. This is because it is necessary to determine a new target position again (S316) when the distance to the subject changes, such as when the subject moves.
In S315, if the half-press of the camera 1 is released (S315, YES), the power supply of the second actuator is turned off (S314).
According to the present embodiment, it is possible to focus even when the subject moves.

(Fourth embodiment)
Next, a fourth embodiment (not shown) will be described. As described in the second embodiment, the second actuator must always apply a voltage in order to generate displacement, and consumes electric power. Therefore, in the present embodiment, when the focal length at which the depth of focus is deep is small, or when the F value is increased by narrowing the aperture, only the first actuator 10 is driven, and the second actuator is driven. Do not let it.
Although the configuration is the same as the lens barrel of the first embodiment, a focal length detection unit that can detect the focal length value by the zoom lens group is provided, and when the focal length is smaller than a certain value, the control unit The second actuator is not driven. Thereby, further power saving can be achieved.

(Fifth embodiment)
FIG. 10 is a diagram illustrating the lens barrel 220 according to the fifth embodiment of the present invention, and is a diagram showing a state in which the linear first actuator 210 is incorporated in the lens barrel 220.
As will be described with reference to FIGS. 11 and 12, the vibrator 211 includes a piezoelectric element 213 and projecting portions 251 and 252 for output extraction. The elastic body 212 is designed so that the resonance frequencies of the longitudinal primary vibration and the bending secondary vibration match.

  When a voltage (drive signal) of this frequency is applied to the piezoelectric element 213 and the phases of both vibrations are shifted by 90 °, elliptical motion is generated in the protrusions 251 and 252 by the combination of the excited longitudinal vibration and bending vibration. . Since the protrusions 251 and 252 are in pressure contact with the relative motion member, a driving force is generated by friction. The protrusions 251 and 252 are made of a wear-resistant material and suppress frictional wear.

The piezoelectric element 213 is generally made of a material such as lead zirconate titanate, commonly called PZT. In recent years, lead-free materials such as potassium sodium niobate, potassium niobate, and sodium niobate are used because of environmental problems. , Barium titanate, bismuth sodium titanate, potassium bismuth titanate and the like.
Next, the configuration of the lens barrel 220 of the fifth embodiment will be described.
The vibrator 211 is supported in the longitudinal direction at the center of the vibrator 211 by a leaf spring 218 provided on the fixing member 221.

The leaf spring 218 is also a pressure member, and presses the vibrator 211 against the moving element 215.
The fixing member 221 is attached to the fixed cylinder 222, and by attaching, the movable member 215, the vibrator 211, and the leaf spring 218 can be configured as one motor unit.
The mover 215 is made of a light metal such as aluminum, and the surface of the sliding surface is provided with sliding plating for improving wear resistance. The moving element 215 is fixed to the linear guide 223, the linear guide 223 is fixed to the fixed cylinder 222, and the moving element 215 is movable in a linear direction with respect to the fixed cylinder 222.

The mover 215 has a protrusion 225 from which a fork 227 connected to the AF ring 228 is engaged, and the AF ring 228 is driven straight.
The AF ring 228 has a structure that is movable along a straight rail 230 provided in the fixed barrel 232. A guide portion 231 provided on the AF ring 228 is engaged with the straight rail 230, and is driven in the straight direction in the optical axis direction along with the straight drive of the moving element 215 so that it can stop at a desired position. ing.

Next, the second actuator 250 mounted on the AF ring 228 will be described.
The second actuator 250 is provided between the AF ring 228 and the AF lens holding unit 29. The second actuator 250, the AF ring 228, and the AF lens holding unit 229 are driven in the optical axis direction while rotating integrally. Is done.
Note that the lens barrel 220 of the present embodiment is a zoom lens and also has a zoom lens group.

  As in FIG. 5, the second actuator 250 is disposed between the end face of the AF ring 228 and the end face of the AF lens holding portion 29 and is provided at four places. The drive circuit also has the same configuration and operation as the first embodiment.

In the present embodiment, the linear first actuator 10 is used, but as in the first to third embodiments, coarse movement is performed by the first actuator 10 and correction is performed by the second actuator. When the AF lens is directly driven by the linear type first actuator 10, the positioning accuracy becomes stricter than that of the rotary type. Therefore, a system in which coarse movement as in the present invention is performed by the first actuator 10 and the position is corrected by the second actuator becomes more effective.
Further, in this embodiment, since the linearly driven AF ring is directly driven by the linear first actuator 10, it is converted from rotation to straight movement as in the case where the annular ultrasonic motor of the first embodiment is mounted. This eliminates the loss that occurs when doing so, thus improving the conversion efficiency. Therefore, the efficiency of the entire drive system can be improved.

  1: Camera, 10: First actuator, 12: Elastic body, 12a: Driving surface, 13: Piezoelectric body, 15: Mover, 20: Lens barrel, 50: Second actuator, 51: Piezoelectric plate, 111: Control unit, 115: detection unit, 160: actuator device

Claims (9)

A first actuator for moving the moving body by the first electromechanical conversion element by that driving force to the voltage to be repeatedly change is applied,
A second actuator for moving the moving member by by that driving force to the second electromechanical transducer DC voltage is applied,
An actuator device comprising: a control unit that moves the moving body by the first actuator and moves the moving body by a movement amount smaller than a movement amount of the movement by the first actuator by the second actuator . The actuator device according to claim 1,
The first actuator is:
Contact before Symbol first electromechanical conversion element, an elastic member causing progression vibration waves to the drive surface by said first electro-mechanical conversion element,
A first relative motion member having a sliding surface in pressure contact with the drive surface of the elastic body and driven by the progressive vibration wave;
The second actuator is
A second relative motion member that is displaced by expansion and contraction of the second electromechanical transducer,
An actuator device characterized by the above. The actuator device according to claim 2,
The first actuator moves the moving body by moving the second actuator;
An actuator device characterized by the above. In the actuator device according to any one of claims 1 to 3,
A detection unit for detecting the position of the moving body;
Wherein, the pre-Symbol first actuator moving said movable body until the first position,
Wherein the detection unit detects the position of the movable body after being moved by the first actuator,
Wherein the control unit moves the front Stories the moving member by the second actuator to said second position from said first position,
An actuator device characterized by the above. A lens barrel comprising the actuator device according to any one of claims 1 to 4 and detachable from a camera body,
The moving body is a lens group;
Receiving a signal for taking a still image from the camera body, driving the second actuator;
A lens barrel characterized by   A lens barrel comprising the actuator device according to any one of claims 1 to 4 and detachable from a camera body,
  The moving body is a lens group;
  The second actuator is a lens barrel that is displaced in the optical axis direction of the lens group. In the lens barrel according to claim 5 or 6 ,
A zoom mechanism for the lens group;
The control unit drives the first actuator and the second actuator when the focal length of the lens barrel is larger than a predetermined focal length,
If less than the predetermined focal length, drive only the first actuator;
A lens barrel characterized by In the lens barrel according to any one of claims 1 to 7 ,
The first actuator is a linear vibration wave actuator;
A lens barrel characterized by Camera comprising the lens barrel according to any one of claims 5 8.

Images