JPH06242485A - Image stabilizer - Google Patents

Abstract

(57) [Abstract] [Purpose] Elimination of a control means around the optical axis of an optical correction means by a structure to improve image blur control and its performance, simplification of the structure, and cost reduction of the apparatus. To achieve. [Structure] The driving force of the driving means 2a, 3, 4p, 4y is
A drive direction restricting means 7, which acts as a force for moving the optical correcting means 1 in a plane orthogonal to the optical axis of the lens group,
8 and magnetically restricting the rotation direction of the lens group around the optical axis, and the driving direction of the optical correction means is set to two orthogonal directions in a plane orthogonal to the optical axis of the lens group. The magnetic regulation means 2a and 3 are provided so that the magnetic force regulates the rotation direction of the lens group around the optical axis.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention corrects image blur by moving an image on an image plane by moving an optical correction means in a plane orthogonal to the optical axis of a taking lens. The present invention relates to the improvement of the image blur correction device.

[0002]

2. Description of the Related Art A conventional device of this type will be described with reference to the perspective view of FIG.

The correction lens 61 can be freely driven (decentered) in two directions (pitch direction 62p and yaw direction 62y) orthogonal to each other and orthogonal to the optical axis. The configuration is shown below.

In FIG. 11, a fixed frame 63 for holding the correction lens 61 is provided with a first holding frame 69 via a slide bearing 64p such as polyacetal resin (hereinafter referred to as POM).
It can slide on the pitch slide shaft 65p attached to the. Further, the fixed frame 63 is sandwiched between pitch coil springs 66p coaxial with the pitch slide shaft 65p and held near the neutral position, and a pitch coil 67p is attached to the fixed frame 63.

The pitch coil 67p is placed in a magnetic circuit composed of a pitch magnet 610p and a pitch yoke 611p, and the fixed frame 63 is driven in the pitch direction 62p by passing a current through the pitch coil 67p. . The pitch coil 67p is provided with a pitch slit plate 68p, and an infrared light emitting diode (hereinafter referred to as IRED) 612p which is a light projecting element and a semiconductor position detecting element (hereinafter referred to as a light receiving element) 612p. , P
Due to the relation of 613p (referred to as SD), the position of the fixed frame 63 in the pitch direction 62p is detected.

A slide bearing 64y such as POM is fitted to the first holding frame 69, and can slide on a housing 614 to which a yaw slide shaft 65y is attached. Since the housing 614 is attached to a lens barrel (not shown), the first holding frame 69 can move in the yaw direction 62y with respect to the lens barrel. Further, a yaw coil spring 66y is provided coaxially with the yaw slide shaft 65y, and like the fixed frame 63, is held near the neutral position.

The fixed frame 63 has a yaw coil 67.
y is provided to sandwich the yaw coil 67y. The fixed frame 63 is also driven in the yaw direction 62y in association with the yaw magnet 610y and the yaw yoke 611y.

The yaw coil 67y is provided with a yaw slit plate 68y, which serves as an IR-projecting element.
Due to the relationship between the ED 612y and the PSD 613y, the position of the fixed frame 63 in the yaw direction 62p is detected as in the pitch direction.

The outputs of the PSDs 613p and 613y are amplified by amplifiers 615p and 615y, and the coils (pitch coil 67y, yaw coil 6) are passed through the circuits described below.
7y) is input. As a result, the fixed frame 63 is driven and the outputs of the PSDs 613p and 613y change.

Here, the pitch and yaw coils 67p, 67
When the drive direction (polarity) of y is set to a direction in which the outputs of PSDs 613p and 613y are reduced (negative feedback), a closed system (closed loop) is formed, and the outputs of PSDs 613p and 613y become stable at a point of almost zero.

The compensating circuits 616p and 616y arranged in the latter stage of the amplifiers 615p and 615y are circuits for further stabilizing the system of FIG.
p and 617y are circuits for compensating for the current applied to the pitch and yaw coils 67p and 67y.

A command signal 6 is externally supplied to such a system.
When 18p and 618y are given, the correction lens 61 is driven extremely faithfully to the command signal in the pitch direction 62p and the yaw direction 62y.

Therefore, the command signals 618p, 61
By inputting 8y as a signal corresponding to the shake of the camera, the correction lens 61 can be driven in real time to cancel the image shake caused by the shake of the camera, and the image shake can be corrected. .

[0014]

However, in the above-mentioned conventional example, the correction lenses 61 are arranged at right angles to each other in the same plane.
Two slide shafts (65p, 65y) to move in one axial direction (pitch, yaw direction 62p, 62y)
It has a gimbal structure that is held by a guide. Therefore, the structure becomes complicated, the number of parts and the number of assembling steps are increased, and there is a problem that the cost is increased and the size is increased.

Further, in order to correct the camera shake, a response up to a frequency band of several tens Hz is required, and highly accurate control of the position accuracy is required, so that it is essential to keep the friction and backlash. Such slide shafts and bearings are expensive, and it is difficult to fix the slide shafts and bearings to the structural members with high precision.

Further, since the slide shaft allows the movement in the axial direction thereof, and at the same time, allows the rotation around the shaft thereof, a regulation means for regulating this rotation is required, but the regulation direction is the other. Since it matches the regulation direction by the slide shaft, it will be double-fitted. It is difficult to maintain such double fitting with high precision without rattling, and adjustment or the like is required in reality, which also causes a cost increase.

(Object of the Invention) The object of the present invention is to eliminate the control means around the optical axis of the optical correction means by the structure, improve the image blur control and its performance, and simplify the structure. An object of the present invention is to provide an image blur correction device capable of achieving cost reduction of the device.

[0018]

According to the present invention, there is provided drive direction control means for causing a drive force of a drive means to act as a force for moving an optical correction means in a plane orthogonal to an optical axis of a lens group, Magnetic regulation means for magnetically regulating the rotation direction of the lens group around the optical axis so that the driving direction of the optical correction means is two directions orthogonal to each other in a plane orthogonal to the optical axis of the lens group. And the magnetic force regulates the rotation direction of the lens group around the optical axis.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the illustrated embodiments.

1 to 5 are views relating to a first embodiment of the present invention, FIG. 1 is an exploded perspective view showing a mechanical structure of an image blur correction device, FIG. 2 is a sectional view of FIG. FIG. 3 is a diagram showing a mechanical configuration and an electrical configuration of the image blur correction device.

In FIGS. 1 to 3, 1 is a correction lens for moving an image by displacing in the direction perpendicular to the optical axis, 2
Is a correction lens frame that holds the correction lens 1 in the center thereof, and has a plurality of permanent magnet portions 2a extending in the normal direction. Reference numeral 3 denotes a yoke which is arranged so as to sandwich the permanent magnet portion 2a and forms a closed magnetic circuit, which is fixed to a base plate 7 described later. Winding coils 4p and 4y are arranged in the closed magnetic circuit and fixed to the yoke 3. 5
Is a capacitance sensor, which is fixed to the yoke 3. Reference numeral 6 denotes a metal plate (see FIG. 2), which is fixed to the outer peripheral portion of the permanent magnet portion 2a.

Reference numeral 7 is a base plate, which has an opening 7b through which the subject light passes and a plurality of protrusions 7a on the outer periphery thereof.
A pressing plate 8 has a plurality of protrusions 8a and an opening 8b through which the subject light passes, and is fixed to the yoke 3.

Numerals 9p and 9y are position detection circuits for detecting the position of the correction lens 1 (correction lens frame 2) using the capacitance sensor 5, and 10p and 10y are currents to the winding coils 4p and 4y based on the command signal. Drive circuit for driving the correction lens 1 (correction lens frame 2) by flowing the current, 11p and 11y are shake detection circuits for detecting shake of the camera using a shake detection sensor or the like, and 12p and 12y are shake detection circuits 11p and 11y. It is a command signal generation circuit that generates a drive command for the correction lens 1 based on a shake signal.

As shown in FIG. 2, the correction lens frame 2 is sandwiched between the aforementioned projections 7a and 8a with a minute gap. Therefore, the correction lens 1 and the correction lens frame 2 are movably and rotatably held in a plane perpendicular to the optical axis defined by the protrusions 7a and 8a.

The permanent magnet portion 2a and the yoke 3 constitute a closed magnetic circuit. If a current is applied to the winding coil 4p (4y) arranged in the void in the circuit, a force is applied according to Fleming's left hand rule. Is generated, but winding coil 4p (4y)
Is fixed to the yoke 3 and does not move, the permanent magnet portion 2a
The side will move. The winding coils 4p and 4y are arranged such that the winding directions are perpendicular to each other. The winding coil 4p drives the permanent magnet portion 2a in the direction of the arrow y in FIG. 2a is driven in the direction of arrow x in FIG.

As described above, the correction lens 1 and the correction lens frame 2 are configured to be freely driven in a plane perpendicular to the optical axis. However, since there is no guide for the rotation direction around the optical axis, the correction lens 1 and the correction lens frame 2 are rotated in the rotation direction. May also move, and may come into contact with the permanent magnet portion 2a and the winding coil 4p (4y). In this case, there is a problem that smooth movement is hindered due to an increase in friction and the winding coil 4p (4y) is disconnected, but in the configuration of the present invention, the magnetic force of the closed magnetic circuit causes There are regulations.

That is, since the magnetic flux generated from the N pole of the permanent magnet portion 2a forms a closed magnetic circuit which returns to the S pole of the permanent magnet portion 2a through the U-shaped yoke 3, the permanent magnet portion 2a is formed. The force acts so that it is located at the stable point with the lowest magnetic resistance.

Specifically, in this embodiment, as shown in FIG. 4, the state in which the permanent magnet portion 2a is located in the central portion of the yoke 3 has the smallest magnetic resistance. Therefore, when the correction lens frame 2 is rotated, it is displaced from the neutral position shown in FIG. Since such a force is a force corresponding to the displacement, if a force equal to or greater than the restoring force acts, naturally a rotational movement will occur. However, the winding coils 4p, 4
Since the force generated by y is only in the x and y directions in FIG. 4,
In principle, no rotational force is generated. Actually, a displacement component in the x and y directions caused by a mounting error or the like, a rotational force due to an unbalanced component of the correction lens frame 2, and the like are generated, but the absolute value thereof is small. Therefore, although it is not impossible to move in the rotation direction at all, it is possible to suppress the rotation amount to an acceptable level.

The problem here is the adverse effect of this rotation.

The original purpose is to move (correct) the image blur by moving the correction lens 1 in the direction perpendicular to the optical axis according to the shake of the camera to correct (cancel) the image shake. Therefore, the object is achieved if the correction lens 1 can be moved to an arbitrary position in the plane perpendicular to the optical axis. It is clear from the fact that the lens itself has a rotationally symmetrical shape with respect to the optical axis, as to the rotation of the lens itself, there is no adverse effect even if the lens itself rotates with respect to the optical axis.

The problem is that x and y of the correction lens 1
Direction detection. As described in the conventional example, in the position detection using the slit and the light emitting / receiving element, the output changes due to the rotation of the correction lens frame and accurate position detection cannot be performed, so the correction lens cannot be moved to an arbitrary position. Further, the change of the position output due to the rotation also causes the oscillation of the feedback position control.

Therefore, in this embodiment, the position is detected as shown in FIG. 3 so that the accurate position can be detected even if the correction lens frame 2 rotates.

That is, the permanent magnet portion 2a of the correction lens frame 2
The outer peripheral part of is made into an arc shape centered on the optical axis of the correction lens 1, and the metal plate 6 is fixed so as to form a similar arc on the outer peripheral part. The distance between the metal plate 6 and the capacitance sensor 5 is measured by disposing the capacitance sensor 5 at a position facing the metal plate 6 and measuring the capacitance. Since the metal plate 6 is a circular arc concentric with the correction lens 1, the position of the correction lens 1 (correction lens frame 2) is detected by the distance detection, and the output changes due to the rotation of the correction lens frame 2 as well. This enables accurate position detection without doing so.

By the way, since the metal plate 6 has a curvature, it is conceivable that an error will occur in the detection direction if the correction lens frame 2 moves in the direction perpendicular to the detection direction. When the center of the capacitance sensor 5 and the center of the correction lens frame 2 are deviated, the distance between the metal plate 6 facing the capacitance sensor 5 changes.
In a configuration in which the total sum of electrostatic capacitance is detected between the sensor surface having a finite area and the facing metal plate 6, the output changes. The magnitude of the error (crosstalk error) caused by such a movement in the direction perpendicular to the detection direction changes depending on the curvature (radius) of the metal plate 6, and its allowable value is determined by the required resolution of the position detection system. If high precision resolution is required, it is necessary to remove this crosstalk error.

FIG. 5 is a front view showing the construction of the electrostatic capacity sensor 5 which is the position detecting means in the first embodiment, and 5a and 5b show the electrode plates.

The electrode plates 5a and 5b are arranged symmetrically and symmetrically with respect to the y-axis having the photographing optical axis as the origin. With such a configuration, when the correction lens frame 2 moves in the x direction, the distance between the metal plate 6 and the electrode plates 5a and 6b keeps a differential relationship in which one is closer and the other is farther. Are offset.

The drive control of the correction lens 1 having the above structure will be described with reference to FIG.

The shake generated in the camera is the shake detection circuit 11p.
The command signal generating circuit 12p (12y) detects a signal detected at (11y) and generates a command signal indicating the position where the correction lens 1 should be driven based on the shake signal. The winding circuit 4p (4y) is energized by the drive circuit 10p (10y) based on this command signal, and as a result, a force acts on the permanent magnet portion 2a by the electromagnetic force to correct the correction lens frame 2 and the correction lens. 1 drives in the x direction (y direction). The position of the correction lens frame 2 is detected by the position detection circuit 9y, and feedback control is performed so that the position signal is fed back to the target value indicated by the command signal. The control is performed in real time, and so-called image stabilization control is performed in which the image does not move even when the camera shakes.

(Second Embodiment) FIGS. 6 to 8 are views relating to a second embodiment of the present invention, and FIG. 6 is a view showing a mechanical configuration and an electrical configuration of an image blur correction device. . The same members as those in the first embodiment are designated by the same reference numerals and the description thereof is omitted here.

In FIG. 6, reference numeral 20 is a reflecting plate forming an arc concentric with the correcting lens 1, and its outer peripheral surface is a mirror surface for reflecting light, and is fixed to the outer peripheral portion of the permanent magnet 2a of the correcting lens frame 2. Has been done. Reference numeral 21 is an IRED, which emits light when energized. A mask plate 22 is disposed on the front surface of the IRED 21 and has a slit 22a formed in the center thereof. 23 is a PSD, 24p, 2 whose output changes depending on the position where the light hits
Reference numeral 4y is a crosstalk correction amount calculation circuit for calculating an error amount caused by movement in the crosstalk direction.

The second embodiment is different from the first embodiment in the position detecting method, and the point will be described.

IRED by the position detection circuit 9p (9y)
21 is energized, the slit 22 of the mask plate 22
The slit-shaped light flux that has passed through a is projected on the reflection plate 20. The projected light is reflected by the outer peripheral mirror surface of the reflection plate 20 and PS
A slit image is formed on D23.

When the correction lens 1 (correction lens frame 2) moves in the y direction (x direction) in FIG. 6, the reflection position of the projection light changes and the slit image on the PSD 23 also changes. Therefore, by detecting the position of the slit image on the PSD 23, so-called triangulation is performed to detect the position of the correction lens 1.

Here, the reflection plate 20 is the correction lens 1
Since it has a concentric circular arc shape, as in the first embodiment, even if the correction lens 1 (correction lens frame 2) rotates about the optical axis, the reflection plate 20 is rotationally symmetric about the optical axis, so PSD2
The position of the slit image on 3 does not change, and no error occurs in position detection.

Next, the crosstalk error will be considered.

The cause of the crosstalk error in the second embodiment is the reflection plate 2 as in the first embodiment.
In addition to the change in distance caused by the curvature of 0, a change in the reflection angle at which the projection light of the IRED 21 is reflected by the outer peripheral mirror surface of the reflection plate 20 can be considered.

FIG. 7 is a view showing a partial vertical cross section of FIG. 6, in which the IRED 21 and the PSD 23 are arranged so as to overlap each other in the optical axis direction to perform triangulation.

According to this configuration, when the correction lens frame 2 moves in the vertical direction in the figure (the y direction in FIG. 6), the slit image on the PSD 23 moves in the horizontal direction in the figure, so that the position of the slit image is changed. The amount of change can be obtained.

When the correction lens frame 2 moves in the crosstalk direction, that is, when it moves in the paper surface direction in FIG. 7 (x direction in FIG. 6), the reflection angle of the projection light changes due to the change of the curvature of the reflection surface. , The slit image moves in the direction of the paper surface in FIG. 7, but P
It does not move in the position detection direction of SD23. Therefore, the PSD 23 formed by the slit 22 a of the mask plate 22
If the upper slit image is long in the paper surface direction to the extent that it is not eclipsed by the change in the reflection angle, the position output will not change.

Therefore, according to the above configuration, even if the reflection angle changes due to the movement in the crosstalk direction, no error occurs in position detection.

Next, the crosstalk error due to the change in the distance caused by the curvature of the reflection plate 20, similar to the first embodiment, will be considered.

FIG. 8 is a schematic view showing the crosstalk error. In the figure, O is the origin when the correction lens 2 is located at the center of the photographing optical axis, that is, the photographing optical axis, and R is the reflection plate 20. It is a circle to do.

Now, let us consider a state in which the origin O is moved leftward x and downward y in FIG.

At this time, the origin O moves to O ₁ and the circle R ₁
Becomes The PSD 23 for detecting the position in the y direction is P of the circle R.
The position is detected by being reflected at the point, but the point P moves to the point P ₁ , and after the movement, the position of the point P ₂ is detected.
Therefore, along with this movement, the y-direction position detection system detects the movement amount of (y + Δy) from P to P ₂ , and Δy indicates that the correction lens frame 2 has moved in the crosstalk direction. Error (crosstalk error). This crosstalk error can be easily obtained by the formula Δy = r−√ (r ² −x ² ) where r is the radius of the circle. The same applies to position detection in the x direction.

Therefore, the correction lens 1 is moved to the position (x,
If you want to move to y), the position detection system is [[x + [r-
√ (r ² −y ² )], y + [r−√ (r ² −x ² )]]
The control may be performed with the target position as the target.

The above control operation will be described with reference to FIG.

The shake generated in the camera is the shake detection circuit 11p.
The signal is detected at (11y), and the detection signal is output to the command signal generation circuit 11p (11y) and simultaneously to the crosstalk correction amount calculation circuit 24p (24y). The crosstalk correction amount calculation circuit 24p (24y) calculates the correction amount in the x (y) direction, that is, the correction amount corresponding to Δx (Δy) described above, based on the output of the shake detection circuit 11p, and outputs the command signal. Output to the generation circuit 12y (12p). The command signal generation circuit 12p (12y) that receives this signal calculates a correction amount based on the detection signal detected by the shake detection circuit 11p (11y), that is, a value corresponding to y (x) described above, and performs crosstalk correction. The correction lens 1 to be targeted from the correction amount Δy (Δx) calculated by the amount calculation circuit 24y (24p)
Position y + Δy (x + Δx) is output.

The drive circuit 10p (10y) performs feedback control in the same manner as in the first embodiment described above so as to position the correction lens frame 2 at the target value, so that image stabilization control is performed in real time. .

As is apparent from the second embodiment, the same effect as that of the first embodiment can be achieved by using the optical position detecting system using the light emitting / receiving elements.

(Third Embodiment) FIGS. 9 and 10 are views according to a third embodiment of the present invention. FIG. 9 is a view showing a mechanical structure and an electric structure of an image blur correction device, and FIG. FIG. 10 is a partially enlarged view of FIG. 9. The same members as those in the first and second embodiments are designated by the same reference numerals, and the description thereof will be omitted.

In FIG. 9, 30 is the first and the second.
In the correction lens frame corresponding to the correction lens frame 2 described in the above embodiment, the plurality of permanent magnet portions 30a are provided and the plurality of cutout hole portions 30b are formed in the same manner as described above. Reference numeral 31 is a guide magnet, which is fixed to both ends of the cutout hole portion 30b. Reference numeral 32 denotes a fixed magnet, which is fixed to the base plate 7 (not shown here) described above, and is located substantially at the center of the cutout hole 30b.

FIG. 10 is an enlarged view of the configuration around the cutout hole portion 30b, in which the polarities of the guide magnet 31 and the fixed magnet 32 are shown.

As shown in this figure, the poles of the guide magnet 31 facing the poles on both ends of the fixed magnet 32 are arranged so as to be opposite poles. Therefore, since the repulsive force always acts between the guide magnet 31 and the fixed magnet 32, the correction lens 1
The rotation of the (correction lens frame 30) is restricted by the magnetic repulsive force.

As described above, the third embodiment is different from the first and second embodiments in the structure of the magnetic holding force for restricting the rotational movement about the optical axis.

Since the other portions operate in the same manner as in the first and second embodiments, in the third embodiment as well, image blurring is performed by the same position control as in the first and second embodiments. Corrective control is achieved.

The feature of the third embodiment is that the action of the magnetic holding force is the same as the rotational movement direction of the correction lens 1, so that a large holding force can be obtained. Also, because a magnetic circuit that is completely different from the magnetic circuit of the drive system is used, it is not limited to a moving magnet type drive system in which the driven object (correction lens) and the permanent magnet move together.
Similar image blur correction control can be realized even with a moving coil type drive system in which the driven object and the coil move together.

According to the present embodiment, the correction lens group is provided with no rotation restriction by a structure such as a gimbal structure.
Since a structure that enables position control that freely moves in a plane orthogonal to the optical axis can be realized, sliding friction due to a structure that regulates rotation is eliminated, performance is improved by controllability, and mechanism is improved. There is an effect that a large price reduction can be achieved due to the reduction of parts and assembling man-hours due to the simplification of.

[0068]

As described above, according to the present invention,
The drive direction control means for acting the drive force of the drive means as a force for moving the optical correction means in a plane orthogonal to the optical axis of the lens group and the magnetic regulation of the rotation direction of the lens group around the optical axis are magnetic. And magnetically controlling means for making the driving direction of the optical correcting means into two directions orthogonal to each other in a plane orthogonal to the optical axis of the lens group, and the optical axis of the lens group is rotated by a magnetic force. The rotation direction is regulated.

Therefore, it is possible to eliminate the control means around the optical axis of the optical correction means by the structure to improve the control of the image blur and its performance, and to simplify the structure and reduce the cost of the apparatus. Is possible.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a mechanical configuration of an image blur correction device according to a first embodiment of the present invention.

FIG. 2 is a partial vertical cross-sectional view of FIG.

FIG. 1 is a diagram showing a mechanical configuration and an electrical configuration of an image blur correction device according to a first embodiment of the present invention.

FIG. 4 is a front view showing a neutral position of the correction lens of FIG.

5 is a diagram for explaining the capacitance sensor of FIG. 1. FIG.

FIG. 6 is a diagram showing a mechanical configuration and an electrical configuration of an image blur correction device according to a second embodiment of the present invention.

7 is a partial vertical cross-sectional view of FIG.

FIG. 8 is a diagram for explaining a crosstalk error that occurs in the second embodiment of the present invention.

FIG. 9 is a diagram showing a mechanical configuration and an electrical configuration of an image blur correction device according to a third embodiment of the present invention.

FIG. 10 is a partially enlarged view of FIG.

FIG. 11 is a diagram showing a mechanical configuration and an electrical configuration of a conventional image blur correction device.

[Explanation of symbols]

 1 Correction Lens 2 Correction Lens Frame 2a Permanent Magnet Part 3 Yoke 4p, 4y Winding Coil 5 Capacitance Sensor 6 Metal Plate 7 Base Plate 8 Holding Plate 9p, 9y Position Detection Circuit 10p, 10y Drive Circuit 11p, 11y Shake Detection Circuit 12p , 12y Command signal generation circuit 21 IRED 22 Slit plate 23 PSD 30 Correction lens frame 30a Permanent magnet part

Claims (4)

[Claims] 1. An optical correction means for decentering an optical axis of a lens group to correct an image blur, a driving means for driving the optical correction means, and a driving force of the driving means for the optical correction means. Of the optical correction means for magnetically restricting the rotation direction around the optical axis of the lens group and the drive direction restriction means for acting as a force for moving the lens group in a plane orthogonal to the optical axis of the lens group. An image blur correction device comprising: a magnetic restricting unit that sets a driving direction to two directions orthogonal to each other in a plane orthogonal to the optical axis of the lens group. 2. The magnetic regulation means comprises a plurality of permanent magnets provided integrally with the optical correction means, and a yoke held by a fixed member and forming a closed magnetic circuit corresponding to the permanent magnets. The image blur correction device according to claim 1, wherein the image blur correction device is a unit configured. 3. The drive means comprises a plurality of permanent magnets provided integrally with the optical correction means, a yoke held by a fixed member and forming a closed magnetic circuit corresponding to the permanent magnets, and the closed magnetic field. A winding coil arranged in the circuit, and an electromagnetic force generated by energizing the winding coil causes the driving direction of the optical correction means to be in a plane orthogonal to the optical axis of the lens group. 3. The image blur correction device according to claim 1, wherein the image blur correction device is a unit that makes two directions orthogonal to each other. 4. A position detecting means for detecting the position of a member which moves concentrically and integrally with the optical correcting means and supplies the detected position to the driving means as a position signal of the optical correcting means. The image blur correction device according to claim 2.