JPH10174470A - Driver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized and light-weight driver suitable for driving the correction lens of a camera, for example. SOLUTION: A lens-holding frame 11 is disposed between an upper moving frame 21 and a lower fixed frame 31. The lens-holding frame 11 is supported movably, while holding a correction lens L, relative to the moving frame 21 in the direction of an X-axis, and the moving frame 21 is supported movably relative to the fixed frame 31 in the direction of a Y-axis. The lens-holding frame 11 can be moved relative to the moving frame 21 in the direction of an Z-axis by means of an X-axis actuator. A rack 26, formed on the moving frame 21 meshes a pinion fixed to the rotary shaft of a motor 28 on a fixed frame 31, and the moving frame 21 can be moved relative to the fixed frame 31 in the direction of the Y-axis. Driving of heavy weight in the direction of Y-axis can be carried out easily, by setting the drive power of the motor 28 to be higher than that of the X-axis actuator.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small and lightweight driving device particularly suitable for driving an optical element in an optical device.

[0002]

2. Description of the Related Art As means for correcting image blur on an image forming surface due to camera shake caused during camera photography, two correction lenses disposed immediately after a diaphragm of a photographing lens are orthogonal to the optical axis direction. 2. Description of the Related Art An anti-vibration optical system driven eccentrically in a plane to be moved is known. In the lens device provided with the vibration proof optical system, a dedicated driving mechanism for driving the correction lens in a predetermined direction is incorporated in the lens device.

[0003] As a mechanism for driving the correction lens of the above-described vibration proof optical system, a drive mechanism including a DC motor and a gear reduction mechanism has conventionally been adopted. In such a configuration, the motor is used. Not only is it large, but also the gear reduction mechanism occupies a large space because it incorporates a mechanism that eliminates backlash. For this reason, there has been a disadvantage that noise is generated during operation and the quality of the product is degraded. Therefore, the applicant has previously proposed a correction lens driving mechanism using an actuator using a piezoelectric element as a driving source (Japanese Patent Application No. Hei 10-26138). 6-200269).

FIG. 17 is a perspective view showing a configuration of a correction lens driving mechanism using an actuator using a piezoelectric element as a driving source, and an actuator 122 for eccentrically moving the first lens unit L1 has an X-axis direction. And an actuator 123 for eccentrically moving the second lens unit L2 is arranged in parallel to the Y-axis direction. The actuator 122 and the actuator 123 have the same configuration, and the piezoelectric element 132 (1
42), drive shaft 131 (141), lens holding frame 112
(113a), the pad 112 and the connecting portion 112a (113a),
2c (113c), leaf spring 112 for adjusting frictional coupling force
d (113d) and the like.

The position of the first lens unit L1 in the X-axis direction is detected by an X-axis position sensor 135 attached to the lens holding frame 112, and the position of the second lens unit L2 in the Y-axis direction is a lens. It is detected by a Y-axis direction position sensor 145 attached to the holding frame 113. The X-axis direction position sensor 135 and the Y-axis direction position sensor 145 include a known position sensor, for example, a magnetized rod 136 (146) magnetized at a predetermined interval on an extension of a lens barrel (not shown).
(141) and the magnetized rod 136 (14
A magnetoresistive sensor that detects the magnetism of 6) with a sensor 135 (145) composed of a magnetoresistive element attached to the lens holding frame 112 (113) is used.

Next, referring to FIG.
2, the first lens unit L1 and the actuator 123
Will be described for driving the second lens unit L2.

The amount of camera shake calculated from the output of a camera shake sensor (not shown), for example, the camera shake sensor for detecting the acceleration in the X-axis and Y-axis directions of the camera, and the amount of drive of the correction lens based on the lens position detected by the position sensor are determined. Calculate and apply a driving pulse to the piezoelectric element of the actuator based on the calculated driving amount to drive the correction lens.

For example, when a drive pulse having a waveform composed of a gentle rising portion as shown in FIG. 18 and a rapid falling portion following the gentle rising portion is applied to the piezoelectric element 132 of the actuator 122, a gentle rising portion of the driving pulse is obtained. In this case, the piezoelectric element 132 gradually expands in the thickness direction, and the drive shaft 131 is displaced in the direction indicated by the arrow a. Therefore, the lens holding frame 112 frictionally coupled to the drive shaft 131 at the coupling portion 112a also moves in the direction of arrow a, and the first lens unit L
1 is displaced in the positive X-axis direction indicated by arrow a.

At the rapid falling portion of the drive pulse, the piezoelectric element 132 rapidly contracts in the thickness direction, and the drive shaft 131 is also displaced in the direction opposite to the arrow a. At this time, the lens holding frame 112 frictionally coupled to the drive shaft 131 at the coupling portion 112a overcomes the frictional coupling force with the drive shaft 131 due to its inertial force and substantially stays at that position. Does not move.

By continuously applying the drive pulse having the above-mentioned waveform to the piezoelectric element 132, the first lens unit L1
It can be moved continuously in the positive axis direction.

When the first lens unit L1 is moved in the negative direction of the X axis, that is, in the direction opposite to the arrow a, a driving pulse having a waveform consisting of a rapid rising portion and a gentle falling portion following the rising portion is applied to the piezoelectric element. 132 can be achieved.

The driving of the second lens unit L2 by the actuator 123 is exactly the same.
By applying the voltage to the 23 piezoelectric elements 142, the second lens unit L2 can be displaced in the Y-axis direction (positive / negative direction) indicated by the arrow b.

[0013]

The actuator using the above-described piezoelectric element does not occupy a large space as in a drive mechanism including a DC motor and a gear reduction mechanism, and the apparatus is not occupied. It can be integrated into a small and lightweight one and has excellent performance such as no noise generated during operation.However, since two correction lenses are used and the configuration is complicated, more With fewer parts,
Even smaller ones were required. An object of the present invention is to solve the above problems.

[0014]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems. According to the first aspect of the present invention, there is provided a fixing member, a first moving member movable in a first direction with respect to the fixing member. A first driving unit disposed on a fixed member to drive the first moving member, a second moving member movable in a second direction with respect to the first moving member, and a first moving member And a second driving unit disposed on a member for driving the second moving member, wherein the driving force of the first driving unit is set to be larger than the driving force of the second driving unit. It is characterized by having.

The first driving means and the second driving means are constituted by different types of driving mechanisms, and the first driving means is a driving means having a rotary driving source, and the second driving means is provided. Is a driving means having a linear driving source. Specifically, the first driving means is a rotary motor, and the second driving means is based on linear displacement of a friction coupling member frictionally coupled to a driving shaft which reciprocates and vibrates based on expansion and contraction displacement of the electromechanical transducer. Drive mechanism.

Further, the first driving means and the second driving means may be constituted by the same type of driving mechanism.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. Reference numeral 11 denotes a lens holding frame, 21 denotes a moving frame, and 31 denotes a fixed frame. The lens holding frame 11 is disposed between the moving frame 21 disposed on the upper side and the fixed frame 31 disposed on the lower side. The lens holding frame 11 holds the correction lens L and is supported movably in the X-axis direction with respect to the moving frame 21. The moving frame 21 is supported movably in the Y-axis direction with respect to the fixed frame 31.

The lens holding frame 11 has a flange portion 12 on the outer side thereof, a friction coupling portion 13 frictionally coupled to a drive shaft 22b of an X-axis actuator 22, which will be described later, provided on the moving frame 21; The moving frame 21 is provided with an X-axis actuator 2 that moves the lens holding frame 11 in the X-axis direction.
2, and a guide shaft 23 for guiding the movement of the lens holding frame 11 in the X-axis direction. The guide shaft 23 is held parallel to the X-axis direction by holding portions 21d and 21e fixed to the moving frame 21.

The moving frame 21 has sliding portions 24 and 25 which are slidably fitted on a guide shaft 32 on a fixed frame 31 described later. The sliding parts 24 and 25 are, as shown in FIG.
4 and 15, the guide shafts 32 on the fixed frame 31 respectively.
Is formed by a projection that fits loosely and without looseness.

Further, a rack 26 is formed outside the moving frame 21 in parallel with the Y-axis direction. Rack 26
Is a rotating shaft 28 of the motor 28 provided on the fixed frame 31.
a and the moving frame 21 meshes with the pinion 27 attached to the
Is configured to be guided by a guide shaft 32 by rotation of a motor 28 and to be movable in the Y-axis direction.

In the fixed frame 31, a motor 28 for moving the moving frame 21 in the Y-axis direction is fixed to a notch 33.
A guide shaft 32 for guiding the movement of the moving frame 21 in the Y-axis direction is provided. The guide shaft 32 is held parallel to the Y-axis direction by holding portions 31a and 31b fixed to the fixed frame 31.

The X-axis actuator 22 is assembled on a moving frame 21 and includes a piezoelectric element 22a, a piezoelectric element 22a.
Drive shaft 22b adhesively fixed to the other end of the drive shaft 2 and the drive shaft 2
2b.

The friction coupling portion 13 includes a slider 13a through which the drive shaft 22b passes and frictionally coupled to the drive shaft 22b from below.
A pad 13 which is inserted into a notch 13c formed on the upper side of the slider 13a and frictionally coupled to the drive shaft 22b from above.
b, a leaf spring 13d for adjusting the frictional coupling force between the drive shaft 22b, the slider 13a and the pad 13b.

In driving the correction lens L in the X-axis direction, since the driving weight is the sum of the weight of the lens holding frame 11 and the weight of the correction lens L and is relatively light, an X-axis actuator using a piezoelectric element is used. In the driving in the Y-axis direction, the motor 28 is used because the driving weight is the sum of the weights of the lens holding frame 11, the correction lens L, and the moving frame 21 and is relatively heavy. This makes it possible to easily drive the heavy moving frame 21. For driving in the Y-axis direction, a Y-axis actuator using a piezoelectric element may be used instead of the motor.

[0025]

Embodiments of the present invention will be described below.
FIG. 1 is a front view showing the structure of a camera shake correction apparatus to which the driving device of the present invention is applied, FIG. 2 is a perspective view of a moving frame thereof, FIG. 3 is a perspective view of a lens holding frame, and FIG. FIG. In the following description, the optical axis of the correction lens L is Z
A plane perpendicular to the axis and the optical axis will be described as an XY plane.

1 to 4, reference numeral 11 denotes a lens holding frame, 21 denotes a moving frame, and 31 denotes a fixed frame. The lens holding frame 11 has a moving frame 21 disposed on the upper side and a fixed frame disposed on the lower side. The moving frame 21 and the fixed frame 31 are disposed between the frames 31.
Are formed in an annular shape having substantially the same external dimensions.
The lens holding frame 11 holds the correction lens L, and the moving frame 21
Are supported so as to be movable in the X-axis direction with respect to. Also,
The moving frame 21 is supported movably in the Y-axis direction with respect to the fixed frame 31. The fixed frame 31 is fixed to a camera body or a lens barrel (not shown).

The lens holding frame 11 has a flange portion 12 on the outer side thereof, a friction coupling portion 13 frictionally coupled to a drive shaft 22b of an X-axis actuator 22, which will be described later, provided on a moving frame 21, and a moving portion, which will be described later. Sliding portions 14 and 15 are provided to be slidably fitted to a guide shaft 23 on the frame 12. A light emitting diode (LED) is provided on the lens holding frame 11 to detect the position of the correction lens L in the X-axis direction and the Y-axis direction.
16a and 17a are provided on the projections 16 and 17, respectively, and light detecting elements 36 and 3 on the fixed frame 31 described later.
7.

As shown in FIG. 3, the sliding portions 14 and 15
The two projections 14a, 14b, and 15 respectively slidably fit the guide shaft 23 on the moving frame 21 without looseness.
a and 15b. Details of the configuration of the friction coupling unit 13 will be described in the configuration of an X-axis actuator 22 described later.

The moving frame 21 includes an X-axis actuator 22 for moving the lens holding frame 11 in the X-axis direction, and the lens holding frame 1.
1 is provided with a guide shaft 23 for guiding movement in the X-axis direction. The guide shaft 23 includes a holding portion 21 fixed to the moving frame 21.
It is held parallel to the X-axis direction by d and 21e.

The moving frame 21 is provided with a fixed frame 31 described later.
Sliding parts 24 and 25 slidably fitted on upper guide shaft 32
Is provided. As shown in FIG. 2, the sliding portions 24 and 25 are each formed of a projection which, like the sliding portions 14 and 15, fits slidably without loosening the guide shaft 32 on the fixed frame 31. I have.

Further, a rack 26 is formed outside the moving frame 21 in parallel with the Y-axis direction. Rack 26
Is a rotating shaft 28 of the motor 28 provided on the fixed frame 31.
a and the moving frame 21 meshes with the pinion 27 attached to the
Is configured to be guided by a guide shaft 32 by rotation of a motor 28 and to be movable in the Y-axis direction. The moving frame 21 is provided with sliding parts 24, 25 by appropriate means such as a spring (not shown).
Are urged without looseness in the direction in which they come into contact with the guide shaft 32, and move accurately along the Y-axis direction.

In the fixed frame 31, a motor 28 for moving the moving frame 21 in the Y-axis direction is fixed to a notch 33.
A guide shaft 32 for guiding the movement of the moving frame 21 in the Y-axis direction is provided. The guide shaft 32 is held parallel to the Y-axis direction by holding portions 31a and 31b fixed to the fixed frame 31.

In the fixed frame 31, the X of the correction lens L
A light emitting diode (LED) 16 provided on the lens holding frame 11 for detecting the positions in the axial direction and the Y axis direction.
a and 17a are located at positions opposing the photodetectors 36 and 37.
Is arranged.

Referring to FIGS. 5 and 6, an X-axis actuator is shown.
The configuration of the data 22 will be described. In FIG. 2, the X-axis actuator 2
Although 2 is provided on the back surface of the moving frame 21, the moving frame 21 is shown downward in FIGS. 5 and 6 for convenience of explanation. FIG. 5 is a perspective view of an exploded state of the X-axis actuator 22, and FIG. 6 is a perspective view of an assembled state.

The X-axis actuator 22 is assembled on a moving frame 21, and includes a piezoelectric element 22a, a piezoelectric element 22a.
Drive shaft 22b adhesively fixed to the other end of the drive shaft 2 and the drive shaft 2
2b.

One end of the piezoelectric element 22a is
It is adhesively fixed to the upper support block 21a. Drive shaft 22
b is movably supported in the axial direction by supports 21b and 21c on the moving frame 21, and moves in the axial direction when the piezoelectric element 22a bonded and fixed to the end thereof expands and contracts in the thickness direction. I do.

The friction coupling portion 13 includes a slider 13a through which the drive shaft 22b penetrates and frictionally coupled to the drive shaft 22b from below.
A pad 13 which is inserted into a notch 13c formed on the upper side of the slider 13a and frictionally coupled to the drive shaft 22b from above.
b, a leaf spring 13d for adjusting the frictional coupling force between the drive shaft 22b, the slider 13a and the pad 13b.
The projection 13e formed on the pad 13b is
The frictional coupling force can be adjusted by adjusting the screw 13f which is in contact with d and fixes the leaf spring 13d to the slider 13a. In addition, as the configuration of the friction coupling unit 13 and the means for adjusting the friction coupling force, known means can be applied.

The moving frame 21 described above can be made of a synthetic resin material in addition to a metal material. When the moving frame 21 is made of a metal material, the support block 21a on the moving frame 21 is also made of a metal material, and the piezoelectric element 22a
Is directly adhered and fixed to the support block 21a. When the movable frame 21 is made of a synthetic resin material, as shown in FIG. 7, the support block 21a is made of a metal material, and the piezoelectric element 22a is bonded and fixed to the support block 21a.

When the moving frame 21 and the support block 21a are made of a synthetic resin material, the piezoelectric element 22a is not directly adhered and fixed to the support block 21a made of a synthetic resin material, but as shown in FIG. And a piezoelectric element 22a and a metal plate 22p interposed therebetween for fixing. Thus, when the movable frame 21 and the support block 21a are made of a synthetic resin material, the expansion and contraction displacement in the thickness direction generated in the piezoelectric element 22a is absorbed by the member (the movable frame 21 and the support block 21a) made of the synthetic resin material. Drive shaft 2 without
2b can be efficiently transmitted.

The drive shaft 22b is desirably made of a material having a high hardness, for example, a metal material in order to efficiently transmit the expansion and contraction displacement generated in the piezoelectric element 22a to the friction coupling portion 13, and is made of a soft material such as a synthetic resin material. In this case, the expansion and contraction displacement generated in the piezoelectric element 22a may not be efficiently transmitted to the friction coupling portion 13.

Also, in order to efficiently transmit the expansion and contraction displacement of the drive shaft 22b to the lens holding frame 11, the contact surface between the drive shaft 22b and the slider 13a of the friction coupling portion 13 is preferably made of a material having high hardness. 9 to 11 show the friction coupling portion 1.
9 shows an example in which the slider 13a and the lens holding frame 11 are integrally formed of a metal material, and the pad 13b is also formed of a metal material.
The contact surface between the slider 13a and the drive shaft 22b and the contact surface between the pad 13b and the drive shaft 22b are made of a metal material having high hardness, so that there is no particular problem.

FIG. 10 shows the slider 13a and the lens holding frame 1.
1 and 1 are made of a hard synthetic resin integrally, and are made of a hard synthetic resin material having a Rockwell hardness of 120 or more. In this case, the hardness is increased by performing metal deposition or metal plating 13p on the contact surface side of the slider 13a with the drive shaft 22b. The pad 13b may be made of a metal material, and when the pad 13b is made of a hard synthetic resin, the metal may be deposited or the metal plating 13p may be formed on the contact surface side with the drive shaft 22b as before.

FIG. 11 also shows the slider 13a and the lens holding frame 1.
In this case, a separate metal material block 13q is fitted on the side of the slider 13a in contact with the drive shaft 22b. The pad 13b disposed on the upper side of the friction coupling portion 13 is also made of a hard synthetic resin, and a separate metal material block 13r is fitted on the contact surface side with the drive shaft 22b.

FIG. 12 shows an example of the driving circuit. The drive circuit includes a control unit 51 including a CPU, camera shake amount detection sensors 52 and 53 for detecting camera shake amounts in the X-axis direction and the Y-axis direction of a camera connected to the input / output port of the control unit 51, and a correction lens. Photodetectors 36 and 37 for detecting the position in the X-axis direction and the position in the Y-axis direction, the light emitting diodes 16a and 17a,
It comprises a pulse generating circuit 55 for driving the X-axis actuator 22 for driving in the X-axis direction, and a motor driving circuit 56 for driving the motor 28 for driving in the Y-axis direction. A signal for instructing a correcting operation of the correcting lens, that is, a shutter signal S in this case, is input to an input port of the control unit 51.

Next, the operation will be described. The detection of the camera shake amount in this embodiment is performed, for example, by detecting the acceleration in the X-axis and Y-axis directions of the camera as described in the conventional example. Control unit 51
When the shutter signal is input to the control unit 51 and the correction operation of the correction lens L is commanded, the control unit 51 determines the X based on the camera shake amount detected by the camera shake amount detection sensors 52 and 53 and the light detection elements 36 and 37 and the correction lens position. The driving amounts in the axial direction and the Y-axis direction are calculated, the pulse generation circuit 55 is operated based on the calculated driving amount in the X-axis direction, the X-axis actuator 22 is operated, and the motor driving circuit 56 is operated. Activate the motor 2
8 to drive the correction lens in the X-axis direction and the Y-axis direction.

Now, when the driving of the correction lens in the X-axis direction is determined, a drive pulse having a waveform composed of a gentle rising portion and a rapid falling portion as shown in FIG. 18 is applied to the X-axis actuator. 22 is applied to the piezoelectric element 22a. At the gentle rising portion of the drive pulse, the piezoelectric element 2
2a gently causes elongation displacement in the thickness direction, and the drive shaft 22
b is displaced in the direction indicated by arrow a. Therefore, the drive shaft 22
b. The lens holding frame 1 frictionally connected to the lens holding frame
1 also moves in the direction of arrow a.

At the rapid falling portion of the drive pulse, the piezoelectric element 22a rapidly contracts in the thickness direction, and the drive shaft 22b also moves in the direction opposite to the arrow a. At this time, the lens holding frame 11 frictionally coupled to the drive shaft 22b by the friction coupling portion 13 overcomes the friction coupling force between the drive shaft 22b and the coupling portion 13 due to its inertia force, and is substantially at that position. Stay and do not move. In addition, the substantive here means
In both the direction of the arrow a and the direction opposite thereto, the sliding movement occurs between the friction coupling portion 13 of the lens holding frame 11 and the drive shaft 22b while causing a slip. It means to include those that move to. The type of movement is determined according to a given friction condition.

The lens holding frame 11, that is, the lens L, can be continuously moved in the positive direction of the X axis by continuously applying the driving pulse having the above-described waveform to the piezoelectric element 22a.

When the correction lens L is moved in the negative direction of the X axis, that is, the arrow a
The movement in the opposite direction can be achieved by applying to the piezoelectric element 22a a drive pulse having a waveform consisting of a rapid rising portion followed by a gentle falling portion. When the lens holding frame 11 moves to a predetermined position, the supply of the driving pulse is stopped, and the movement of the lens L stops.

The driving of the lens in the Y-axis direction is performed by a motor 28. When the drive amount of the lens in the Y-axis direction is determined, the rotation direction of the motor 28 is determined and driven according to the sign of the drive amount. The rotation of the motor 28 is a pinion 27,
The moving frame 21 is moved along the guide shaft 32 via the rack 26
Move in the axial direction. The lens holding frame 1 is placed on the moving frame 21.
Since 1 is held, the lens holding frame 11 also moves in the Y-axis direction. When the lens holding frame 11 moves to a predetermined position, the energization of the motor is stopped, and the movement of the lens L stops.

In the first embodiment described above, when the correction lens L is driven in the X-axis direction, the driving weight is
The weight of the correction lens L and the weight of the correction lens L are relatively light. Therefore, an X-axis actuator using a piezoelectric element is used, and Y is used.
In the axial driving, the motor 28 is used because the driving weight is the sum of the weights of the lens holding frame 11, the correction lens L, and the moving frame 21 and is relatively heavy. This makes it possible to easily drive the heavy moving frame 21.

Next, a second embodiment of the present invention will be described. The second embodiment is different from the first embodiment in that the driving of the lens in the Y-axis direction also uses an actuator using a piezoelectric element.

FIG. 13 is a perspective view of a movable frame, FIG. 14 is a perspective view of a lens holding frame, and FIG. 15 is a perspective view of a fixed frame. In the following description, the optical axis of the correction lens L is described as a Z axis, and a plane perpendicular to the optical axis is described as an XY plane. In addition, portions common to the configuration of the first embodiment are denoted by the same reference numerals, detailed description thereof will be omitted, and only different portions will be described.

13 to 15, reference numeral 11 denotes a lens holding frame, 21 denotes a moving frame, and 31 denotes a fixed frame. The lens holding frame 11 has a moving frame 21 disposed on the upper side and a fixed frame disposed on the lower side. The movable frame 21 and the fixed frame 31 are arranged between the frames 31, and are formed in an annular shape having substantially the same external dimensions. The lens holding frame 11 holds the correction lens L and is supported movably in the X-axis direction with respect to the moving frame 21. The moving frame 21 is supported movably in the Y-axis direction with respect to the fixed frame 31.

The structure of the lens holding frame 11 is not different from that of the first embodiment.

The moving frame 21 includes an X-axis actuator 22 for moving the lens holding frame 11 in the X-axis direction, and a lens holding frame 1.
1 is provided with a guide shaft 23 for guiding movement in the X-axis direction. The moving frame 21 has sliding portions 24 and 25 slidably fitted on a guide shaft 32 on a fixed frame 31 and a friction coupling portion frictionally coupled to a drive shaft 44b of a Y-axis actuator 41 described later. 45 are provided.

The fixed frame 31 has a Y-axis actuator 41 for moving the moving frame 21 in the Y-axis direction, and a Y-axis actuator 41 for moving the moving frame 21.
A guide shaft 32 for guiding movement in the axial direction is provided.

FIG. 16 is a perspective view showing the structure of the Y-axis actuator 41, and the X-axis actuator 22 shown in FIGS.
It has the same configuration as. That is, the Y-axis actuator 41
Is composed of a piezoelectric element 44a, a drive shaft 44b adhesively fixed to the other end of the piezoelectric element 44a, and a friction coupling portion 45 frictionally coupled to the drive shaft 44b.

One end of the piezoelectric element 44a is fixed to the fixed frame 31.
It is adhesively fixed to the upper support block 41a. Drive shaft 44
b is movably supported in the axial direction by supports 41b and 41c on the fixed frame 31, and moves in the axial direction when the piezoelectric element 44a bonded and fixed to the end thereof expands and contracts in the thickness direction. .

The friction coupling portion 45 includes a slider 45a through which the drive shaft 44b passes and frictionally coupled to the drive shaft 44b from below.
A pad 45 which is inserted into a notch 45c formed on the upper side of the slider 45a and frictionally coupled to the drive shaft 44b from above.
b, a leaf spring 45d for adjusting the frictional coupling force between the drive shaft 44b, the slider 45a and the pad 45b.
The projection 45e formed on the pad 45b is
The frictional coupling force can be adjusted by adjusting the screw 45f which is in contact with the fixing member 45d and fixes the leaf spring 45d to the connecting portion 45a. In addition, since the configuration and operation of the Y-axis actuator 41 are the same as those of the X-axis actuator 21, detailed description will be omitted.

In the second embodiment described above, an actuator using a piezoelectric element is used for driving the correction lens L in the X-axis direction and the Y-axis direction. When the driving weight is relatively light and the driving force of the actuator is sufficient, an actuator using a piezoelectric element is used for driving in the X-axis direction and the Y-axis direction, so that the entire configuration can be reduced in size and weight. In addition to the above, there is no possibility that noise is generated from the gear mechanism when the gear mechanism is used as in the first embodiment.

[0062]

As described above, the present invention provides a fixing member and a first member movable in a first direction with respect to the fixing member.
A moving member, a first driving unit disposed on a fixed member to drive the first moving member, a second moving member movable in a second direction with respect to the first moving member, A second driving member disposed on the first moving member and driving the second moving member;
The driving force of the first driving means is set to be greater than the driving force of the second driving means. It is possible to provide a driving device which can be summarized as a driving device and is most suitable to be applied to a driving device such as a correction lens of a camera.

[Brief description of the drawings]

FIG. 1 is a front view showing a configuration of a camera shake correction device using a driving device according to the present invention.

FIG. 2 is a perspective view of a moving frame of the camera shake correction apparatus shown in FIG.

FIG. 3 is a perspective view of a lens holding frame of the camera shake correction apparatus shown in FIG.

4 is a perspective view of a fixed frame of the camera shake correction device shown in FIG.

FIG. 5 is an exploded perspective view of the X-axis actuator.

FIG. 6 is a perspective view of an assembled state of the X-axis actuator.

FIG. 7 is a side view for explaining the configuration of a piezoelectric element fixing portion of the X-axis actuator (part 1).

FIG. 8 is a side view (part 2) for explaining the configuration of a piezoelectric element fixing portion of the X-axis actuator.

FIG. 9 is a cross-sectional view (part 1) for explaining the configuration of a friction coupling portion of the X-axis actuator.

FIG. 10 is a cross-sectional view (part 2) illustrating the configuration of a friction coupling portion of the X-axis actuator.

FIG. 11 is a cross-sectional view (part 3) for explaining the configuration of the friction coupling portion of the X-axis actuator.

FIG. 12 is a block diagram illustrating an example of a driving circuit.

FIG. 13 is a perspective view of a moving frame of the camera shake correction apparatus according to the second embodiment.

FIG. 14 is a perspective view of a lens holding frame of the camera shake correction apparatus according to the second embodiment.

FIG. 15 is a perspective view of a fixed frame of the camera shake correction apparatus according to the second embodiment.

FIG. 16 is a perspective view of an assembled state of a Y-axis actuator.

FIG. 17 is a perspective view showing a configuration of a conventional correction lens driving mechanism using an actuator using a piezoelectric element.

FIG. 18 illustrates a waveform of a driving pulse.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Lens holding frame 21 Moving frame 31 Fixed frame 13 Friction coupling part 13a Slider 13b Pad 14, 15 Sliding part 21a Support block 22 X-axis actuator 22a Piezoelectric element 22b Drive shaft 23 Guide shaft 24, 25 Sliding part 26 Rack 27 Pinion 28 Motor 32 Guide shaft

Claims (5)

[Claims] A fixed member; a first movable member movable in a first direction with respect to the fixed member; a first driving means disposed on the fixed member for driving the first movable member; A second moving member movable in a second direction with respect to the first moving member; and a second driving means disposed on the first moving member for driving the second moving member. In the driving device, the driving force of the first driving unit is set to be larger than the driving force of the second driving unit. 2. The drive device according to claim 1, wherein the first drive means and the second drive means are constituted by different types of drive mechanisms. 3. The driving device according to claim 1, wherein said first driving means and said second driving means are constituted by the same type of driving mechanism. 4. The apparatus according to claim 2, wherein said first drive means is a drive means provided with a rotary drive source, and said second drive means is a drive means provided with a linear drive source. Drive. 5. The linear motor according to claim 1, wherein the first driving means is a rotary motor, and the second driving means is a straight line of a friction coupling member frictionally coupled to a driving shaft which reciprocally oscillates based on expansion and contraction displacement of the electromechanical transducer. The driving device according to claim 1, wherein the driving device is a driving mechanism based on displacement.