JP3424454B2 - Optical image stabilization device and optical device provided with the device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image stabilizer for an optical device using an actuator using an electromechanical converter for driving a correction lens , and an image stabilizer for the same.
The present invention relates to a provided optical device .

[0002]

2. Description of the Related Art Conventionally, as a means for correcting an image blur on an image plane caused by camera shake caused by taking a picture, two correction lenses arranged immediately after an aperture of a photographing lens are arranged in the optical axis direction. There is known an anti-vibration optical system that is eccentrically driven in a plane orthogonal to each other. In the lens device provided with this image stabilizing optical system, a dedicated drive mechanism for driving the correction lens in a predetermined direction is incorporated in the lens device.

A drive mechanism including a DC motor and a gear reduction mechanism has been conventionally used as a mechanism for driving the above-described correction lens of the image stabilization optical system. However, in such a structure, not only is the motor large, The gear reduction mechanism also occupies a large space because it incorporates a mechanism that eliminates backlash, and the lens barrel must inevitably become large in size. Therefore, the applicant has previously proposed a correction lens drive mechanism using an actuator using a piezoelectric element as a drive source (see Japanese Patent Application No. 6-200269).

FIG. 13 is a perspective view showing the construction of the above-mentioned correction lens driving mechanism. The actuator 122 for eccentrically moving the first lens unit L1 is eccentrically moved for the second lens unit L2 in parallel with the X-axis direction. The actuator 123 is arranged parallel to the Y-axis direction. The actuator 122 and the actuator 123 have the same structure, and the piezoelectric element 13
2 (142), the drive shaft 131 (141), and the lens holding frame 112 (113) and the drive shaft 131 (14).
1), a coupling portion 112a (113a) that frictionally couples, a pad 112c (113c), a leaf spring 112d (113d) that adjusts the friction coupling force, and the like.

The position of the first lens unit L1 in the X-axis direction is detected by an X-axis direction 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 the lens. It is detected by the 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 are known position sensors, for example, magnetized rods 136 (146) magnetized at predetermined intervals on the extension of a lens barrel (not shown) as the drive shaft 131.
The magnetizing rod 136 (14) is arranged in parallel with (141).
It is possible to use a magnetoresistive sensor or the like for detecting the magnetism of 6) by the sensor 135 (145) formed of a magnetoresistive element attached to the lens holding frame 112 (113). In addition, various position sensors can be used.

Next, referring to FIG. 13, the actuator 12
2 and the first lens unit L1 and the actuator 123
Driving of the second lens unit L2 by means of will be described.

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

For example, when a drive pulse having a waveform having a gentle rising portion and a rapid falling portion subsequent thereto as shown in FIG. 14 is applied to the piezoelectric element 132 of the actuator 122, a piezoelectric element is generated at the gentle rising portion of the driving pulse. The element 132 gently expands and displaces in the thickness direction, and the drive shaft 131 displaces 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 direction of the X axis indicated by arrow a.

At the rapid falling edge of the drive pulse, the piezoelectric element 132 rapidly contracts and displaces in the thickness direction, and the drive shaft 131 also displaces 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 friction coupling force between the lens holding frame 112 and the drive shaft 131 due to its inertial force and remains substantially at that position. The lens unit L1 does not move.

The term "substantially" as used herein means that the lens holding frame 1 is in either the arrow a direction or the opposite direction.
Twelve coupling portions 112a and the drive shaft 131 follow each other while slipping, and due to the difference in drive time, the arrow a as a whole.
It is meant to include things that move in the direction. The form of movement is determined according to the given friction conditions.

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

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 piezoelectric element is applied with a drive pulse having a waveform consisting of a rapid rising portion and a gradual falling portion. It can be achieved by applying to 132.

The driving of the second lens unit L2 by the actuator 123 is exactly the same, and the driving pulse is applied to the actuator 1
By applying to the piezoelectric element 142 of No. 23, the second lens unit L2 can be displaced in the Y-axis direction (positive and negative directions) indicated by the arrow b.

[0014]

The actuator using the above-mentioned piezoelectric element is small and lightweight without occupying a large space unlike a drive mechanism including a DC motor and a gear reduction mechanism. Although it has excellent performance such as being able to operate and no noise is generated at the time of operation, there is still a demand for a smaller product having a smaller number of parts. This invention solves the above problems.
Of an optical device that uses an actuator with a decided new configuration
An object of the present invention is to provide an image stabilization device and an optical device equipped with the device .

[0015]

The present invention is to solve the above-mentioned problems. The invention of claim 1 drives the lens drive means based on the lens position correction information corresponding to the amount of camera shake of the optical device, In a camera shake correction device for an optical device that controls the position of a correction lens that is movably arranged on a plane perpendicular to the axis, a plurality of lens drives that move the position of the correction lens on a plane perpendicular to the optical axis A drive pulse generating means, and a control means for controlling the lens drive mechanism. The control means calculates a drive time ratio of the plurality of lens drive mechanisms based on the lens position correction information, and outputs the drive pulse. optical device and controls so that drive pulses output from the generating means in response to the ratio of the computed driving time is supplied alternately to the plurality of lens driving mechanism It is a hand-shake correction apparatus.

Then, the control means determines the waveform of the drive pulse generated by the drive pulse generating means based on the lens position correction information. Further, the drive pulse generating means includes a single waveform generating section and a single boosting section for the plurality of lens driving mechanisms.

According to a fourth aspect of the present invention, the amount of camera shake of an optical device is reduced.
Lens driving means based on corresponding lens position correction information
It is arranged so that it can be driven and moved in a plane perpendicular to the optical axis.
Equipped with an image stabilizer that controls the position of the correction lens
In an optical device, on a plane perpendicular to the optical axis
Multiple lens drive mechanism that moves the position of the correction lens
And control the drive pulse generating means and the lens drive mechanism.
A lens position correction information.
Based on the report, the ratio of the drive time of the plurality of lens drive mechanisms
The drive pulse output from the drive pulse generation means
The number of pulses is calculated according to the calculated drive time ratio.
The number of lens drive mechanisms can be controlled so that they are supplied alternately.
An optical device having an image stabilization device characterized by
It

Then, the control means corrects the lens position.
Drive pulse generated by the drive pulse generation means based on the information
Determine the waveform of the loose. Also, the drive pulse generating means
Generates a single waveform for the multiple lens drive mechanisms
Section and a single booster section.

Further, the optical device is a camera.
Good.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION In a vibration-proof optical system for a camera as an embodiment of the present invention, one correction lens L is arranged in the lens system, and the correction lens L is perpendicular to the optical axis direction. It adopts a configuration in which it is eccentric on a flat surface.

The drive mechanism of the correction lens L will be described. Figure 1
As shown in FIG. 6, an X-axis actuator 10 and a Y-axis actuator 20 are arranged on the underframe 1. One ends of the piezoelectric elements 11 and 21 of the actuators 10 and 20 are
The piezoelectric elements 11 and 2 are bonded and fixed to a plane parallel to the Y-axis direction and the X-axis direction of the support block 3 on the underframe 1, respectively.
Drive shafts 13 and 23 are adhesively fixed to the other end of 1, and the drive shafts 13 and 23 are movably supported by blocks 12 and 22 in a direction parallel to the X axis and a direction parallel to the Y axis, respectively. . Moving members 14 and 24 are frictionally coupled to the drive shafts 13 and 23, respectively, and extensions 14b and 24b of the moving members 14 and 24 are engaged with the lens barrel 2 of the correction lens L.

When a drive pulse is applied to the piezoelectric elements 11 and 21 and vibration in the thickness direction is generated in the piezoelectric elements, a predetermined drive pulse waveform is determined via the drive shafts 13 and 23 and the moving members 14 and 24. The lens barrel of the correction lens L moves in the direction.

The X-axis actuator 10 and the Y-axis actuator 20 are controlled by the CPU 52. That is, the drive pulse generator 53 is composed of the waveform generator 54 and the booster 55, and the CPU 52 outputs the drive pulse generator 53 based on the lens position correction information detected by the lens position detection sensor 57 and the camera shake detection sensor 58. Waveform of output drive pulse, X-axis actuator 10, Y-axis actuator 2
The drive time ratio of 0 is calculated, and the X-axis actuator 10, corresponding to the drive time ratio via the switching unit 56,
The Y-axis actuator 20 is controlled to be driven alternately.

With this configuration, a single drive pulse generator may be provided for two sets of actuators, and since the two sets of actuators do not operate simultaneously, a power supply with a small current capacity is used. Therefore, it is possible to reduce the number of parts and the space for the circuit board and the power supply inside the camera.

[0025]

Embodiments of the present invention will be described below.
1 is a perspective view showing the structure of a camera shake correction device to which the present invention is applied, FIG. 2 is a front view thereof, FIG. 3 is a front view showing a lens barrel of a correction lens L, and FIG. 4 is A-A of FIG. 2 is a sectional view taken along the line BB in FIG. 2, and FIG. 6 is a sectional view in which a main part of the X-axis actuator 10 in FIG. 1 to 6, 1
Is an underframe that supports the drive mechanism of the correction lens, and an opening 1a is provided in the central portion thereof. Reference numeral 2 denotes a lens barrel of the correction lens L, which is located in the opening 1a portion of the center portion of the underframe 1 and is on a plane perpendicular to the optical axis (Z axis) by an X axis actuator 10 and a Y axis actuator 20 described later. Is movably supported in the X-axis direction and the Y-axis direction. A support block 3 to which the piezoelectric elements of the X-axis actuator 10 and the Y-axis actuator 20 are adhered and fixed is provided on the underframe 1.

The underframe 1 is arranged in a lens barrel (not shown). When the underframe 1 is moved in the optical axis direction, the underframe 1 is moved in the optical axis direction while regulating the position of the underframe 1 with respect to the optical axis.
A focus guide shaft 4 arranged parallel to the optical axis is arranged in the lens barrel, and a hole 3a through which the focus guide shaft 4 penetrates is provided in the support block 3.

As is apparent from FIG. 3, in order to hold the position of the lens barrel 2 with respect to the underframe 1 in the lens barrel 2 of the correction lens L, three radially extending arms 2a, 2b, 2c are provided.
Are formed. As apparent from FIG. 4, the arms 2a, 2b and 2c are provided with protrusions 2p and 2q on the front surface and the back surface thereof, respectively, and the arm 2a of the lens barrel 2 is provided by the disc-shaped pressing plate 5. When 2b and 2c are pressed toward the underframe 1, the protrusions 2p and 2q are respectively formed in the underframe 1.
It is possible to hold the position of the lens barrel 2 with respect to the underframe 1 by making contact with the pressing plate 5. A slight inclination of the lens barrel 2 with respect to the underframe 1 can be corrected by adjusting the height of the protrusion 2p.

Next, the X-axis actuator 10 and the Y-axis actuator 20 will be described. First, the X-axis actuator 10 will be described. X on the support block 3 on the underframe 1.
One end of the piezoelectric element 11 of the shaft actuator 10 is adhered and fixed, and the drive shaft 13 is adhered and fixed to the other end of the piezoelectric element 11, and one end of the drive shaft 13 is moved by the block 12 in a direction parallel to the X axis. Supported as possible. Drive shaft 13
The friction coupling portion 14a of the moving member 14 is movably coupled in a direction parallel to the X axis by an appropriate friction force. Further, the extension portion 14 b extended from the moving member 14 engages with the groove 15 a extending in the direction parallel to the Y axis of the action member 15 formed in the lens barrel 2 of the correction lens L, and is attached to the action member 15. It is pressed against by a biasing spring 16. The pressing force of the extension portion 14b by the biasing spring 16 is set to be sufficiently larger than the force of the moving member 14 moving in the X-axis direction.

Since the extension portion 14b is engaged with the groove 15a of the acting member 15 and is movable in the Y-axis direction, the correction lens L
When the lens barrel 2 moves in the Y-axis direction, the extension 14b moves in the Y-axis direction on the groove of the action member 15 and does not hinder the movement of the lens barrel 2 in the Y-axis direction.

Referring to FIGS. 4 and 5, the extension 14b of the moving member 14 in the X-axis actuator 10 described above.
The configuration of the portion of the engaging member 15 engaged with the groove 15a can be clearly understood. In addition, the X-axis actuator 10 in FIG.
Referring to FIG. 6 which shows an enlarged main portion of FIG. 6 and shows a partially cut-away cross section, an extension portion 14b extended from the moving member 14 is provided with a groove 15 of an action member 15 formed in the lens barrel 2 of the correction lens L.
It can be clearly seen that the extension portion 14b is engaged with a and is pressed against the acting member 15 by the biasing spring 16.

Next, the Y-axis actuator 20 will be described. One end of the piezoelectric element 21 of the Y-axis actuator 20 is adhesively fixed to the support block 3 on the underframe 1, and the piezoelectric element 2
A drive shaft 23 is adhesively fixed to the other end of the drive shaft 1, and one end of the drive shaft 23 is supported by a block 22 so as to be movable in a direction parallel to the Y axis.

The structure of the Y-axis actuator 20 described below is the same as the structure of the X-axis actuator 10 and some parts are omitted from the drawing, but the reference numerals of the respective members in the drawings for explaining the X-axis actuator are in the 20s. I want you to read it and understand it.

A frictional coupling portion 24a of a moving member 24 is frictionally coupled to the drive shaft 23 by an appropriate frictional force so as to be movable in a direction parallel to the Y axis. Further, the extension portion 24b extended from the moving member 24 engages with the groove 25a extending in the direction parallel to the X axis of the action member 25 formed in the lens barrel 2 of the correction lens L, and is attached to the action member 25. It is pressed by a biasing spring 26. The pressing force of the extension portion 24b by the biasing spring 26 is set to be sufficiently larger than the force of the moving member 24 moving in the Y-axis direction.

Since the extension portion 24b is engaged with the groove of the action member 25 and is movable in the X axis direction, when the lens barrel 2 of the correction lens L is moved in the X axis direction, the extension portion 24b is moved by the action member 25. It moves on the groove 25a in the X-axis direction and does not hinder the movement of the lens barrel 2 in the X-axis direction.

Next, the operation will be described with reference to FIG. X
Since the axis actuator 10 and the Y-axis actuator 20 have almost the same configuration, the operation of the X-axis actuator 10 will be described here, and the description of the operation of the Y-axis actuator 20 will be omitted.

When a drive pulse having a waveform having a gentle rising portion and a rapid falling portion subsequent thereto is applied to the piezoelectric element 11 as shown in FIG. 14, the piezoelectric element 11 is gently moved at the gentle rising portion of the driving pulse. A stretching displacement in the thickness direction is generated, and the drive shaft 13 is displaced in the direction indicated by the arrow a. Therefore, the moving member 14 frictionally coupled to the drive shaft 13 at the friction coupling portion 14a and the extension portion 14b thereof also move in the direction of arrow a. The extension portion 14b and the action member 15 are pressed against each other by the biasing spring 16, and the pressure contact force is set to be sufficiently larger than the force of the moving member 14 moving in the axial direction. Since it moves integrally with the member 15 in the arrow a direction, the lens barrel 2 of the correction lens L coupled to the acting member 15 moves in the arrow a direction (here, the X-axis positive direction).

At the rapid falling edge of the drive pulse, the piezoelectric element 11 rapidly undergoes contraction displacement in the thickness direction, and the drive shaft 13 is also displaced in the direction opposite to the arrow a. At this time, the moving member 1 frictionally coupled to the drive shaft 13 by the friction coupling portion 14a.
4 and its extension 14b are driven by the inertial force of the drive shaft 1
The lens barrel 2 of the correction lens L does not move, because it overcomes the frictional coupling force between the lens barrel 3 and the lens 3 and remains substantially at that position.

The term "substantially" as used herein means that the drive shaft 13 and the moving member 14 are chased while slipping in both the direction of arrow a and the direction opposite thereto, and the difference in drive time is caused. Therefore, it is meant to include those that move in the direction of arrow a as a whole. What kind of movement form will be
It is determined according to the given friction conditions.

By continuously applying the drive pulse having the above waveform to the piezoelectric element 11, the correction lens L can be continuously moved in the positive direction of the X axis. X for the correction lens L
The movement in the negative axis direction can be achieved by applying to the piezoelectric element 11 a drive pulse having a waveform having a rapid rising portion and a gentle falling portion following the rising portion.

The Y-axis actuator 20 also operates in the same manner as the X-axis actuator 10, and the correction lens L can be continuously moved in the Y-axis direction.

The moving member 14 (same for the moving member 24) is
In the above-mentioned configuration, as shown in FIG. 7, the friction coupling portion 14a and the extension portion 14b are formed from a single plate of elastic material such as metal. In particular, the frictional coupling portion 14a is a substantially cylindrical type (C type) having a partially opened portion having a diameter smaller than the diameter of the drive shaft 13.
A frictional coupling portion is formed by being formed in a cross section, and is configured to be frictionally coupled to the drive shaft 13 by its own elastic force. However, in addition to the above configuration, the frictional coupling portion 14a of the moving member 14 may have a triangular cross section as shown in FIG. 8 or a quadrangular cross section as shown in FIG. 9, and may be frictionally coupled by its own elastic force. Good.

For the position of the correction lens L moved in the X-axis direction and the Y-axis direction for camera shake correction, the known magnetoresistive sensor described in the prior art can be used. In this embodiment, the correction lens is used. An LED (light emitting diode) is attached to the lens barrel 2 of L, and the light projected from the LED is detected by a two-dimensional PSD (photodiode) attached to the underframe 1, and the position of the correction lens L in the X axis direction and the Y axis direction. A lens position detection sensor configured to detect the is used. As a result, the number of parts can be reduced and the structure can be simplified.

Further, a camera shake detection sensor is installed in the camera, and is configured to detect the amount of camera shake that occurs in the camera. The camera shake detection sensor is composed of an acceleration sensor that detects accelerations Ax and Ay in the X-axis direction and the Y-axis direction of the camera, and the detected accelerations Ax and Ay are integrated twice by the CPU 52 that controls camera shake correction, which will be described later. As a result, the camera shake amounts Mx and My can be detected.

Next, the control circuit will be described. Figure 10
FIG. 6 is a block diagram of a control circuit 50 that drives a shutter of a camera and corrects a camera shake by a correction lens. The control circuit 50 includes a CPU 51 that controls the drive of the shutter and a C
Shutter button S connected to the input port of PU51
H, and a shutter unit 60 connected to the output port
Equipped with.

The control circuit 50 also controls the CPU 52 for controlling the camera shake correction by the correction lens, the lens position detection sensor 57 for detecting the positions of the lens connected to the input port of the CPU 52 in the X-axis direction and the Y-axis direction, and Camera shake detection sensor 58 for detecting camera shake amount, CPU 52
Drive pulse generating section 53 and switching section 56 connected to the output port of the. The drive pulse generator 53
Is composed of a waveform generating section 54 and a boosting section 55, and an X-axis actuator 10 and a Y-axis actuator 20 are connected to a switching section 56. The CPU 51 and the CPU 52 are connected so that signals can be exchanged with each other. Further, the control circuit 50 is provided with one power source 59, and has a shutter unit 60, an X-axis actuator 10, and a Y-axis actuator 2.
0 is configured to be driven by being supplied with power from this one power source.

Next, the control operation of the control circuit 50 will be described with reference to FIG.
The control circuit block diagram of FIG. 11 and the flow charts of FIGS. 11 and 12 will be described. When the CPU 51 receives a shutter signal indicating the operation of the shutter button SH of the camera (not shown), the CPU 51 drives and controls the stepping motor (not shown) of the shutter unit 60 to open the shutter from the initial state to a predetermined set opening position (step P1, (See FIG. 11). Since the opening state of the shutter can be maintained by the stop torque of the stepping motor, the power supply to the stepping motor is stopped after opening the shutter (step P
2), the drive pulse generator 53 for driving the correction lens
And the X-axis actuator and Y via the switching unit 56.
Power is supplied to the shaft actuator (step P3).

After maintaining the shutter in the open state for a time corresponding to the exposure amount, the power supply to the X-axis actuator and the Y-axis actuator is stopped (step P4), and the power supply to the shutter unit 60 is restarted. , The stepping motor is driven to close the shutter (step P5).

Next, the control of camera shake correction by the CPU 52 will be described. When a signal indicating the accelerations Ax and Ay in the X-axis direction and the Y-axis direction output from the camera shake detection sensor 58 installed in the camera (not shown) is input, the CPU 52 integrates the input accelerations Ax and Ay twice. Then, the camera shake amounts Mx and My and their directions are determined (step P11, see FIG. 12).

Next, based on the lens position correction information such as the determined camera shake amounts Mx and My and their directions and the lens position output from the lens position detection sensor 57, the correction lens in the X-axis direction and the Y-axis direction. The driving amount is calculated (step P12), and the ratio of the driving time of the X-axis actuator and the Y-axis actuator is determined (step P13).

The waveform generator 54 of the drive pulse generator 53 is operated to determine an appropriate drive pulse waveform based on the drive amount and drive direction in the X-axis direction, and the booster 55 is instructed to output it (step P14). ). Further, the switching unit 56 is operated to switch the drive pulse output from the booster unit 55 to be output to the X-axis actuator 10, and the X-axis actuator 1 is driven based on the previously determined drive time ratio.
0 is driven (step P15), and after the driving time has elapsed, the switching unit 56 is operated to move the booster 55 to the X-axis and Y-axis.
Disconnect the shaft actuator (step P16).

The waveform generator 54 is operated to determine an appropriate drive pulse waveform based on the drive amount and drive direction in the Y-axis direction, and the booster 55 is instructed to output it (step P1).
7). Further, the switching unit 56 is operated to output the drive pulse output from the booster unit 55 to the Y-axis actuator 20.
Output, and drives the Y-axis actuator 20 on the basis of the previously determined drive time ratio (step P
18) After the elapse of the driving time, the switching unit 56 is operated to disconnect the X-axis and Y-axis actuators from the booster unit 55 (step P19).

While the shutter of the camera is open, the processing from the detection of the camera shake amount to the driving of the actuator is repeated at high speed until the camera shake amounts Mx and My become zero (step P20), and the correction lens is shaken. By displacing the image at a high speed in the direction that corrects, the image blur on the film surface is prevented.

According to the control circuit described above, a single power source can be used to drive the correction lens and the shutter, and the circuit for driving the X-axis actuator and the Y-axis actuator can be shared. As a result, the number of circuit components can be reduced, and the current capacity of the battery can be reduced, so that the arrangement space inside the camera can be saved.

The embodiment described above is an example in which the present invention is applied to a camera shake correction apparatus. However, the present invention is not limited to the camera shake correction apparatus, but may be caused by a shake of a lens in an optical device such as binoculars or a projector. It can be applied to image blur correction. Needless to say, the actuator described in the above embodiments can be applied not only to driving the lens in the optical device but also to driving other general equipment.

[0055]

As described above, the invention of claim 1
Is a camera shake correction device that drives the lens drive means based on lens position correction information corresponding to the amount of camera shake of the optical device , and controls the position of a correction lens that is movably arranged on a plane perpendicular to the optical axis. In the image stabilization apparatus of the optical device provided with, a plurality of lens drive mechanisms for moving the position of the correction lens on a plane perpendicular to the optical axis, drive pulse generation means, and a lens drive mechanism are provided. And a control unit for controlling, wherein the control unit calculates a ratio of driving times of the plurality of lens driving mechanisms based on lens position correction information,
The driving pulse output from the driving pulse generating means is controlled so as to be alternately supplied to the plurality of lens driving mechanisms corresponding to the calculated driving time ratio.

Thus, a single drive pulse generating means may be provided for a plurality of lens driving mechanisms, and since a plurality of lens driving mechanisms do not operate simultaneously, a power source with a small current capacity is used. In addition, the number of components can be reduced and the space for the circuit board and the power source can be reduced, which is a remarkable effect in reducing the size and weight of the optical image stabilizer for an optical device. .

The invention of claim 4 is the same as that of claim 1.
Is the optical device equipped with the optical image stabilizer of the optical device?
As in the first aspect of the invention, a plurality of lens drive mechanisms are provided.
On the other hand, it suffices to provide a single drive pulse generating means.
Because multiple lens drive mechanisms do not work at the same time
The power supply can also use a power supply with a small current capacity.
Reduced number of parts and small space for circuit board and power supply
Lights equipped with an image stabilization device, such as light
This is a remarkable effect in reducing the size and weight of the learning device.

[Brief description of drawings]

FIG. 1 is a perspective view showing the configuration of a camera shake correction device.

FIG. 2 is a front view of the correction lens driving mechanism shown in FIG.

FIG. 3 is a front view showing a lens barrel of the correction lens shown in FIG.

FIG. 4 is a sectional view taken along the line AA of FIG.

5 is a cross-sectional view taken along the line BB of FIG.

FIG. 6 is an enlarged front view of the main part of the X-axis actuator in FIG.

FIG. 7 is a perspective view illustrating a configuration of a frictionally coupled portion of a moving member.

FIG. 8 is a perspective view (No. 1) for explaining another example of the configuration of the frictional coupling portion of the moving member.

FIG. 9 is a perspective view (No. 2) for explaining another example of the configuration of the frictional coupling portion of the moving member.

FIG. 10 is a block diagram of a control circuit.

FIG. 11 is a flowchart for explaining the control operation of the control circuit.
To (1).

FIG. 12 is a flowchart for explaining the control operation of the control circuit.
To (Part 2).

FIG. 13 is a perspective view illustrating a configuration of a conventional camera shake correction device for a camera.

FIG. 14 is a diagram showing an example of a waveform of a drive pulse applied to the electromechanical conversion element.

[Explanation of symbols]

1 frame 2 lens barrel 3 Support block 4 Focus guide shaft 10 X-axis actuator 20 Y-axis actuator 11, 21 Piezoelectric element 13, 23 Drive shaft 14, 24 Moving member 14a, 24a Friction coupling part 14b, 24b extension 15, 25 Working member 50 control circuit 51, 52 CPU 53 Drive pulse generator 54 Waveform Generator 55 Booster 56 Switching part 57 Lens position detection sensor 58 Shake detection sensor 59 power supply 60 shutter unit L correction lens SH Shutter button

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) G03B 5/00

Claims (7)

(57) [Claims] 1. An optical system for driving a lens driving unit based on lens position correction information corresponding to a camera shake amount of an optical device to control a position of a correction lens movably arranged on a plane perpendicular to an optical axis. The image stabilization device of the device comprises a plurality of lens drive mechanisms for moving the position of the correction lens on a plane perpendicular to the optical axis, drive pulse generation means, and control means for controlling the lens drive mechanism, The control means calculates a drive time ratio of the plurality of lens drive mechanisms based on the lens position correction information, and outputs the drive pulse output from the drive pulse generation means to the drive time corresponding to the calculated drive time ratio. An image stabilization apparatus for an optical device, which is controlled so as to alternately supply a plurality of lens driving mechanisms. 2. The image stabilization apparatus for an optical device according to claim 1, wherein the control unit determines the waveform of the drive pulse generated by the drive pulse generation unit based on the lens position correction information. 3. The optical device according to claim 1, wherein the drive pulse generating means includes a single waveform generating section and a single boosting section for the plurality of lens driving mechanisms. Image stabilizer. 4. A lens position corresponding to the amount of camera shake of an optical device.
The lens drive means is driven based on the position correction information
On the other hand, the position of the correction lens that is arranged so that it can move in a plane perpendicular to it.
In an optical device equipped with an image stabilization device that controls the
Position of the correction lens on a plane perpendicular to the optical axis.
A plurality of lens drive mechanisms to be moved, a drive pulse generation means, and a control means for controlling the lens drive mechanism are provided, and the control means is configured to control the plurality of lens drive mechanisms based on the lens position correction information.
Number of lens drive mechanism drive time ratio is calculated,
The drive pulse output from the pulse generator is calculated as described above.
The plurality of lens driving mechanisms corresponding to the ratio of the driving time
Butenyl and controlling the so that to alternately supplied to the
An optical device equipped with a correction device. 5. The lens position correction information is controlled by the control means.
Of the drive pulse generated by the drive pulse generating means based on
The camera shake according to claim 4, wherein the waveform is determined.
An optical device equipped with a correction device. 6. The drive pulse generating means includes a plurality of the drive pulse generating means.
A single waveform generator and a single lifter for the lens drive.
The hand according to claim 4, wherein the hand comprises a pressure part.
An optical device equipped with a shake correction device. 7. The optical device is a camera.
The handbag according to any one of claims 4 to 6 to be used as a signature.
An optical device equipped with a correction device.