JPH07261234A - Image blurring correcting device - Google Patents

Abstract

PURPOSE:To execute processing for correcting image blurring only to shake which is not intended by a photographer by inhibiting the driving of a correction optical system in the case the duration of a state where the magnitude of the deviation of an optical axis exceeds a specified range is equal to or above a specified value. CONSTITUTION:The shake of a camera is detected by an angular velocity sensor to correct the image blurring. In the case a situation that angular velocity is out of a specified range continues in the midst of photometric processing, a counter MOV is made incremental. The counter MOV is compared with the specified value. In the case a state where the angular velocity is out of the specified range continues to some extent in the midst of photometry, the counter MOV exceeds the specified value. In such a case, the processing for correcting the image blurring is not performed (S17 to S23) because of judging that correcting the image blurring is not required (S16). In the case a state where the angular velocity is very high does not continue for a certain time or more while executing processing in the midst of photometry, the counter MOV shows a value under the specified value. In such a case, the correcting processing is executed because of judging that correcting the image blurring is required (S16).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image blur compensating device for a camera, and more particularly to an image blur compensating device for compensating a blur of an optical axis of a photographing optical system of a camera with respect to a subject caused by camera shake or the like. .

[0002]

2. Description of the Related Art In recent years, various functions of a camera such as film winding and focusing have been automated, and a photograph has come to be taken based on accurate distance measurement / photometry data. However, even if the subject is in focus, a photograph may be taken with a blurred image due to camera shake during slow shutter or telephoto shooting. For this reason, a camera equipped with a correction mechanism for preventing image blur has been desired. There are various methods of image blur correction, but in addition to the shooting optical system, a correction optical system is provided, and the correction optical system moves and corrects the subject image on the film surface according to the shake of the optical axis of the shooting optical system. The method of doing is known.

[0003]

The camera rotates at a large angular velocity when shooting is performed by a technique called panning, that is, a technique of performing exposure while following an object that moves vertically and horizontally. You will be exercised. In this case, the angular velocity of the optical axis of the photographing lens of the camera includes the camera shake component, but most of it is due to the rotation of the camera intended by the photographer. In such a case, if the image blur correction process is performed, the subject will be photographed with the image blur even though the photographer has performed the follow shot accurately following the subject.

[0004]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention automatically determines whether or not the shake of the photographing optical axis is intended by the photographer, and performs the image blur correction processing only for the blur not intended by the photographer. It is an object of the present invention to provide an image blur correction device that executes.

[0005]

Therefore, according to the first aspect of the present invention, the image blur correction device according to the present invention comprises a photographing optical system for forming a subject image on the light receiving surface of the photographing device, and a photographing optical system for the subject. Detecting means for detecting the magnitude of the optical axis blurring of
A correction optical system for moving the subject image with respect to the light receiving surface, and a drive unit for driving the correction optical system so as to cancel the movement of the image surface with respect to the light receiving surface due to the shake of the optical axis, Further, a determining means for determining whether or not the magnitude of the optical axis shake exceeds a predetermined range, a timer means for measuring the duration of a state where the optical axis shake exceeds the predetermined range, and a timer. And a prohibiting means for prohibiting the driving of the correction optical system by the driving means when the time measured by the means is equal to or more than a predetermined value.

According to a sixteenth aspect of the present invention, there is provided an image blur compensating device for use in a camera, which comprises a detecting means for detecting the amount of blur of a photographing optical axis with respect to a subject. During the exposure processing of the camera, the correction means for performing the correction based on the detection result of the detection means and the state where the magnitude of the blurring of the photographing optical axis exceeds the predetermined range continues for a predetermined time immediately before the exposure processing is started. Determine whether or not
Based on the judgment means and the judgment made by the judgment means, (1) when it is judged that the state exceeding the predetermined range has continued, the image blur correction means is prohibited, and (2) the state where the predetermined range is exceeded. And a control unit that drives the image blur correction unit when it is determined that the image blur correction unit has not continued.

[0007]

FIG. 9 is a diagram showing the principle of an image blur correction device. In the figure, L is a taking lens, and F is a film surface. It is assumed that the camera rotates about the center X of the lens L in the direction of arrow A by an angle θ due to camera shake or the like. Then, the image that should originally be formed at the point P1 on the fill surface F is formed at the point P2. When such a movement of the image forming point occurs during the exposure, a photograph is taken with the image blurred. Therefore, a correction optical system (not shown) is provided between the taking lens L and the film surface F, and the correction optical system is driven to move the optical axis in parallel in the direction of arrow B to connect to the original point P1. Image blurring is corrected by forming an image. In such an image blur correction apparatus, an angular velocity sensor (angular acceleration sensor) detects camera blur, calculates a correction amount based on an output signal from the sensor, and drives a correction optical system based on the calculation result. Then, image blur correction is performed. Figure 1
FIG. 4 is a diagram for explaining the operation of the image blur correction device incorporated in the camera 1. In FIG. 1, the shutter button 2
0, the angular velocity sensors 51 and 52, the taking lens 2, the control unit 30, and the image blur correction unit 40 are shown.

The shutter button 20 is a two-step switch, and ON / OFF information of the switch is input to the control means. When the shutter button 20 is pressed halfway,
Distance measurement and photometry are performed, and when the button is fully pressed, exposure is performed.

The angular velocity sensor 51 detects the angular velocity of the rotational movement of the camera in the vertical direction (vertical direction) of FIG. 1, and outputs a voltage corresponding to the angular velocity in that direction due to camera shake to the control means 30. The angular velocity sensor 52 is a sensor that detects the angular velocity of the rotational movement of the camera in the direction (horizontal direction) perpendicular to the paper surface of FIG. 1, and outputs a voltage according to the detected angular velocity to the control means 30.

The correcting means 40 independently deflects the optical axis of the photographing optical system in the direction perpendicular to the paper surface and in the direction parallel to the paper surface based on a command from the control means 30. The control unit 30 drives the correction unit 40 based on the input signals from the sensors 51 and 52 to execute the image blur correction process.

FIG. 2 is a diagram showing the structure of the correction means. The correction lens 401 is fitted in a cylindrical lens frame 410 having a large diameter portion 411 and a small diameter portion 412. The small diameter portion 412 is inserted into and supported by the opening 422 of the first rotating plate 420.

A support shaft 421 is provided on the first rotating plate 420. The support shaft 421 is inserted into a shaft hole 439 formed in the second rotating plate 430 and rotatably supports the first rotating plate 421 with respect to the second rotating plate 430. A drive arm 424 is provided on the opposite side of the support shaft 421 across the opening 422. The drive arm 424 is provided with a screw hole 423, and a screw member 426 described later is provided.
Is engaged with.

The screw member 426 is connected to the rotating shaft of the motor 425 via a flexible joint. The motor 425 is fixed on the second rotating plate 430.
When the motor 425 is driven, the first rotating plate 420 causes the support shaft 4 to move due to the engagement of the screw member 426 and the screw hole 423.
It is driven to rotate about 21 in the direction indicated by arrow V according to the rotation direction of the screw member 426. A permanent magnet 427 is provided at the end of the drive arm 424. Permanent magnet 42
MR (magnetic resistance) at the position facing 7
A sensor 428 is arranged. The MR sensor 428 is fixed on the second rotating plate 430, and has a permanent magnet 427.
The displacement amount (that is, the drive arm 424) from the predetermined reference position is detected. Therefore, the displacement of the lens 401 in the arrow V direction can be detected by the output signal of the MR sensor 428.

A support shaft 431 is provided on the second rotating plate 430. The support shaft 431 is inserted into a shaft hole 449 formed in the substrate 440 and supports the second rotating plate 430 so as to be rotatable with respect to the substrate 440. The second rotating plate 430 is provided with an opening 432 through which the small diameter portion 412 is inserted. The opening portion 432 has a size that does not hinder the movement of the small diameter portion 412 due to a predetermined amount of rotation of the first rotating plate 420 when the support shaft 421 is fitted in the shaft hole 439.
A drive arm 434 is provided on the side opposite to the support shaft 431 across the opening 432. The drive arm 434 is provided with a screw hole 433 and is engaged with a screw member 436 described later.

The screw member 436 is connected to the rotating shaft of the motor 435 via a flexible joint. The motor 435 is fixed on the substrate 440, and when the motor 435 is driven, the screw member 436 and the screw hole 433.
The second rotation plate 430 is driven to rotate about the support shaft 431 in a direction indicated by an arrow H (a direction intersecting with the paper surface of FIG. 2) in accordance with the rotation direction of the screw member 436. .
A permanent magnet 437 is provided at the end of the drive arm 434. At the position facing the permanent magnet 437, MR (magn
etic resistance) A sensor 438 is provided. M
The R sensor 438 is fixed on the substrate 440 and detects the amount of displacement of the drive arm 434 from a predetermined reference position. Therefore, according to the output signal of the MR sensor 438, the lens 40
The displacement of arrow 1 in the direction of arrow H can be detected.

The substrate 440 is provided with an opening 442 through which the small diameter portion 412 is inserted. The opening 442 has a shape that does not hinder the movement of the small diameter portion 412 on a plane parallel to the film surface (not shown) by driving the first rotating plate 420 and the second rotating plate 430. There is.

FIG. 3 is a view of the lens frame 410, the first rotary plate 420, the second rotary plate 430, and the substrate 440, which are combined together, viewed from the photographing lens side. In FIG. 3, the first rotating plate 420 and the second rotating plate 43
0 is at the reference position. In this state, the center of the rotation shaft 421 of the first rotation plate, the optical axis O of the correction lens 401, the permanent magnet 427, and the MR sensor 428 are arranged on the straight line a. Similarly, the center of the rotation shaft 431 of the second rotation plate 430, the optical axis O of the correction lens 401, the permanent magnet 437, and the MR sensor 43.
8 are arranged on the straight line b. In the reference state shown in FIG. 3, the optical axis O of the correction lens 401 and the optical axis of the taking lens coincide with each other.

FIG. 4 is a block diagram for explaining the control system of this embodiment. The switch 21 is a photometric switch that is turned on by pressing the shutter button 20 halfway. The switch 22 is a release switch that is turned on by fully pressing the shutter button 20. The ON / OFF information of the photometric switch 21 and the release switch 22 is input to the ports PI1 and PI2 of the CPU 31 as a 1-bit digital pulse, respectively. Angular velocity sensors 51 and 52
The voltage output of is input to the A / D conversion ports AD1 and AD2 of the CPU 31. Further, the MR sensor 428 corresponding to the displacement of the first rotating plate 420 and the second rotating plate 430.
And the voltage output from 438 is the A / D conversion port AD3
And AD4.

At the D / A output ports DA1 and DA2 of the CPU 31, a motor 42 for driving the first rotating plate 420 is provided.
5 and the motor 435 that drives the second rotating plate 430,
They are connected via motor drive circuits 461 and 462, respectively. The CPU 31 calculates the drive amounts of the motor 425 and the motor 435 based on the above input signal,
A voltage corresponding to the driving amount is output from the ports DA1 and DA2.

FIG. 5 shows a sensor 51 (same for 52).
It is a figure explaining correction | amendment of the output voltage V1 from. The angular velocity sensor 51 has a voltage V of a magnitude corresponding to the rotational movement of the camera.
1 is output. However, the output voltage V of the angular velocity sensor 51
1 contains a DC component called null voltage. Therefore, if only the DC component can be extracted as V3, as shown in FIG.
2 is obtained as V2 = V1-V3. Since the DC component contained in V1 does not have a constant value but changes according to the magnitude of the angular velocity itself, in the present embodiment, the model of the high-pass filter shown in FIG. The DC component contained in the output voltage V1 is removed.

FIG. 7 is a flow chart showing the control sequence of the camera of this embodiment. In this flowchart, only the parts necessary for explaining the image blur correction control are extracted. Furthermore, it also removes the DC component (or the extremely low frequency component compared to camera shake) due to residual charges in the circuit. Also, although two angular velocity sensors are actually used, their output values are independent of each other. And is used to drive the motor corresponding to each sensor. To avoid duplication of explanation, only one image blur correction process is shown in the flowchart of FIG. 7.

The sequence is roughly divided into the following five parts. (1) Initial setting section S1-S2 (2) Pre-photometry processing S3-S6 (3) Processing during photometry S7-S14 (4) Processing during exposure S15-S24 (5) Post-exposure processing S25

In the initial setting section, the voltage V used for calculation is
3 and V4 are initialized (S1), and the counter MOV is cleared (S2). The voltage V3 is the above DC component,
It is calculated and updated according to the voltage V2 corresponding to the angular velocity. The voltage V4 corresponds to the amount of movement of the camera, and V2
Calculated based on.

In the photometric pre-processing, the output voltage (analog value) of the angular velocity sensor 51 is converted to a digital value V1 for calculation.
After the D / D conversion (S3), the DC component V3 calculated by using the arithmetic expression equivalent to the model of FIG. 6 is removed, and the voltage V2 corresponding to the angular velocity is calculated (S4). In addition,
The DC component V3 is updated according to the voltage V2 (S5).
When the shutter button 20 is pressed halfway (S6), the process proceeds to the next photometry process.

In the photometric processing, the voltage V2 is calculated (S8, S9) based on the A / D converted value V1 of the output voltage of the angular velocity sensor 51 as in the case of the photometric preprocessing, and the DC component V3 is continuously updated. To be done. Here, after the calculation of the voltage V2, the counter MOV is incremented or set to 0 according to the magnitude of V2. The photographer will follow the shot, etc.
When the camera is intentionally moved, the angular velocity of the camera during photometry takes a larger value than the angular velocity due to camera shake in a stationary state. In such a case, image blur correction is considered unnecessary. In this embodiment, it is determined during the photometric process whether the angular velocity is within a predetermined range by comparing the absolute value of the angular velocity with a predetermined minimum value MAX (S
10) If the situation of outside the predetermined range continues, the counter MOV is incremented (S12). When the angular velocity takes a value within the predetermined range (when the absolute value of the angular velocity is less than or equal to the predetermined value MAX), the counter is reset to 0 (S1).
1). Then, it is determined whether or not the image blur correction is necessary by referring to the counter MOV at the time of exposure. The processing from S6 to S14 is repeated until the shutter button 20 is pressed. When the operator releases the shutter button 20, the metering switch 21 is turned off (S6), and S
Return to processing from 3. When the shutter button 20 is fully pressed during photometry (S14), the process proceeds to the next exposure process. Further, the processing from S7 to S14 is performed by the release switch 2
2 will loop while it is off, and the detection of the angular velocity will be repeated at a predetermined timing. Therefore, the processes of S10 and S12 can be regarded as a time measurement process of measuring the period during which the angular velocity is within the predetermined range.

In the during-exposure process, processes related to exposure such as narrowing down, mirror up, and shutter release are performed (S).
15) Then, the counter MOV updated during photometry is compared with a predetermined value (here, 20) (S16). As described above, when the state in which the angular velocity is out of the predetermined range continues during the photometry to some extent, the counter MOV exceeds the predetermined value. In this case, it is determined that the image blur correction is not necessary (S16), and the image blur correction process performed in S17 to S23 is not performed. If the state in which the angular velocity is sufficiently high does not continue for a certain time or more while the photometric processing is being executed, the counter MOV becomes less than the predetermined value. In this case, it is determined that image blur correction is necessary (S1
6), correction processing is executed. This means that, from a different point of view, whether or not the image blur correction is necessary is determined based on the change in the angular velocity within the predetermined time immediately before the exposure.

The image blur correction process (S17-S23) is performed as follows. First, similar to the pre-photometric processing and the mid-photometric processing, the voltage from the sensor 51 is A / D converted into a digital value V1 to obtain a voltage V2 from which the DC component V3 is removed. Then, the DC component V3 is updated according to the obtained V2. Furthermore, the amount of camera movement (rotation angle of the optical axis of the taking lens)
The voltage V4 corresponding to (corresponding to the integration of the voltage V2 corresponding to the angular velocity) is calculated (S20).

The current displacement of the correction lens 401 in the V direction corresponds to the A / D converted value V5 of the output voltage of the MR sensor 428 (S21). Then, the difference between the digital conversion value V5 of the output voltage of the MR sensor 428 and the voltage V4 corresponding to the movement angle of the camera is obtained as the voltage V6 corresponding to the further drive amount of the correction lens 401 (S22).
The voltage V6 is D / A converted and output to the motor drive circuit 461 (S23). The motor drive circuit 461 is connected to the motor 42.
Image blur correction processing is performed by driving 5 to move the optical axis. This image blur correction process is repeatedly executed during exposure,
Prevents image blurring on the film surface due to camera shake.

When the exposure time has elapsed (S24), the shutter is closed, post-exposure processing such as mirror down and aperture opening is performed (S25), and the sequence ends. When the power of the camera is turned on, the process returns to the beginning (S1) of the sequence.

In the above description of the correction sequence, the correction only in the V direction has been described. However, in reality, similar correction processing is executed in each of the V and H directions. Therefore, although not shown, V and H
When both angular velocities in the directions take values of a predetermined time or more and a predetermined value or more, it is determined that the image blur correction is not necessary. If the angular velocity in at least one of the V direction and the H direction takes a value within a predetermined range within a predetermined time, the counter MOV for each of the V direction and the H direction is temporarily reset. Specifically, the same processing as the processing from S1 to S9 shown in FIG. 7 is executed also in the H direction,
As described above, in S10, the absolute value of the voltage V2 corresponding to the angular velocity in the V direction is compared with the predetermined value MAX in the V direction. If it is determined in S10 that | V2 |> MAX, H
The absolute value of the voltage corresponding to the angular velocity in the direction is compared with the predetermined value in the H direction. When the absolute value of the voltage corresponding to the angular velocity in both the V direction and the H direction is larger than the predetermined value in each direction, the counter MOV corresponding to each direction
Is incremented, otherwise it is reset. The process from S17 to S23 is also V in the flowchart.
Although only the direction is shown, it is performed independently in each of the V direction and the H direction.

In the above-described image blur correction processing, the direct current component V is set in the pre-photometric processing and the during-photometric processing and during-exposure processing.
The constants for updating 3 are different values K1 and K2. Immediately after the power of the camera is turned on, the angular velocity sensor may output a large voltage value due to the electric charge remaining in each circuit in the camera. Further, during the pre-photometric processing, an operation in which the angular velocity changes greatly, such as an operation of pointing the camera toward a subject, is frequently performed. In the photometric pretreatment, the sensors 51, 52 caused by such a cause
It is desirable that the output from C is canceled immediately so as not to affect the image blur correction process during the exposure process.

On the other hand, in the process after the photometry process, it is considered that the camera is already aimed at the subject, and it is preferable that the fluctuation of V1 having a relatively low frequency is also reflected in the image blur correction. Therefore, in the pre-photometric processing, K1 is made relatively small so that the DC component can be promptly removed by following the change in V1. From a different point of view, this means that V3 is obtained in the high pass filter shown in FIG. 7 in such a manner that relatively high frequency components are cut. On the other hand, after photometry is started, K2
Is set to a value larger than K1, and a gradual change in V1 is reflected in the image blur correction process. This is equivalent to setting the cutout frequency to a relatively low frequency in the high pass filter.

As described above, according to the image blur correction device for a camera of the present invention, the device itself automatically determines whether or not the image blur correction is necessary, and the correction is performed only when the correction is necessary. Processing is performed.

In the present invention, the time during which the shake of the photographing optical axis is larger than the normal shake of the hand is measured,
Since the necessity of the correction is determined by comparing the time measurement result with the predetermined value, the determination standard can be easily changed by changing the parameter.

In the present invention, the shake of the photographing optical axis is detected by the angular velocity of the rotational movement of the camera. Further, the angular velocities in two directions parallel to the film surface and orthogonal to each other are respectively detected, and the correction is independently performed in each direction. Therefore, it is possible to determine whether or not the correction is necessary independently or collectively.

Since the present invention has the extraction means for extracting the angular velocity component having the predetermined frequency or more from the detected angular velocity, the photometry / movement in which the camera moves largely and the photometry / exposure in which the camera is aimed at the subject. By changing the components to be extracted during exposure, unnecessary correction processing (arithmetic processing) can be avoided.

Since the determination as to whether or not the correction is necessary is made based on the angular velocity detected by the sensor, it is not necessary to add any mechanical detection means. Moreover, a highly reliable determination is performed regardless of the camera fixing method (attachment to a tripod, etc.).

[Brief description of drawings]

FIG. 1 is a diagram showing an outline of a configuration of a camera to which an image blur correction device of the present invention is applied.

FIG. 2 is an exploded view of a drive mechanism that drives a correction lens.

FIG. 3 is a front view of the drive mechanism of FIG. 2 viewed from the side of a taking lens.

FIG. 4 is a block diagram showing a configuration of a control system of the image blur correction device.

FIG. 5 is a block diagram illustrating correction of a sensor output voltage.

FIG. 6 is a block diagram showing a model of a circuit that corrects a sensor output voltage.

7 is a flowchart showing a control sequence of a camera to which the present invention is applied together with FIG.

8 is a flowchart showing a control sequence of a camera to which the present invention is applied together with FIG.

FIG. 9 is a diagram showing the principle of image blur correction.

[Explanation of symbols]

 1 Camera 2 Shooting Lens 20 Shutter Button 21 Photometric Switch 22 Exposure Switch 31 CPU 51, 52 Angular Velocity Sensor 401 Correction Lens 427, 437 Permanent Magnet 428, 438 MR Sensor 425, 435 Drive Motor 461, 462 Motor Drive Circuit

Claims (16)

[Claims] 1. A photographing optical system for forming a subject image on a light-receiving surface of a photographing device, a detection means for detecting a magnitude of a deviation of an optical axis of the photographing optical system with respect to the subject, and a subject image for the light-receiving surface. And a drive means for driving the correction optical system so as to cancel the movement of the image plane with respect to the light receiving surface due to the blurring of the optical axis. Determination means for determining whether or not the magnitude of the axis shake exceeds a predetermined range; timer means for measuring the duration of the state where the shake of the optical axis exceeds the predetermined range; and the timer An image blur correction device, comprising: a prohibiting unit that prohibits the driving of the correction optical system by the driving unit when the time measured by the unit is equal to or more than a predetermined value. 2. The detecting means includes angular velocity detecting means for detecting a shake of an optical axis of the photographing optical system as an angular velocity,
The image blur correction device according to claim 1, wherein the predetermined condition is that the angular velocity is within a predetermined range. 3. The detecting means has an extracting means for extracting an angular velocity component having a predetermined frequency or more from the angular velocity.
The image blur correction device according to claim 2. 4. The detecting means repeatedly detects a shake of the optical axis at a predetermined timing, and the timer means has a counting means, and detects the shake of the optical axis repeatedly detected at the predetermined timing. 4. The image blur correction device according to claim 1, wherein the counting function is achieved by incrementing the counting means when the size exceeds the predetermined range. 5. The angular velocity detecting means has two angular velocity sensors for detecting the shake of the optical axis as first and second angular velocities in first and second directions orthogonal to each other, respectively. Image blur correction device. 6. The prohibiting means, in each of the two directions, when the duration of a state in which the first and second angular velocities exceed first and second predetermined ranges, respectively, is equal to or more than the predetermined value. 6. The image blur correction device according to claim 5, wherein the driving of the correction optical system is prohibited only in the case. 7. The image blur correction device according to claim 5, wherein the drive means has a calculation means for calculating a drive direction and a drive amount of the correction optical system based on the first and second angular velocities. . 8. The image blur correction device according to claim 7, wherein the prohibition unit further prohibits the calculation by the calculation unit. 9. The image blur correction device according to claim 1, wherein the drive unit drives the correction optical system in a plane parallel to the light receiving surface. 10. The method according to claim 1, wherein when the deviation of the optical axis of the photographing optical system does not exceed the predetermined range, the counting result of the timer means up to that point is discarded. The image blur correction device according to any one of the claims. 11. The image blur correction device according to claim 1, wherein the image blur correction device is used in a camera, and the light receiving surface is a film surface of the camera. 12. The image blur correction device according to claim 11, wherein the drive unit drives the correction optical system during an exposure process of the camera. 13. The image blur correction device according to claim 11, wherein the timer means counts time before the exposure process of the camera is started. 14. The photometric processing is performed in the camera prior to the exposure processing, and the timer means measures time during the photometric processing prior to the exposure processing.
The image blur correction device according to claim 12, 13 or 14. 15. The image blur correction device according to claim 11, wherein the drive unit drives the correction optical system during the exposure processing. 16. An image blur correction device for use in a camera, comprising: detection means for detecting a magnitude of blurring of a photographing optical axis with respect to a subject; and correction based on a detection result of the detection means during exposure processing of the camera. Correction means for performing, and for a predetermined time immediately before the exposure process is started, it is determined whether or not the state in which the magnitude of the shake of the photographing optical axis exceeds a predetermined range has continued, Based on the judgment of the judgment means, (1) when it is judged that the state exceeding the predetermined range is continued, the image blur correction means is prohibited, and (2) the state where the predetermined range is exceeded is An image blur correction apparatus comprising: a control unit that drives the image blur correction unit when it is determined that the image blur correction has not continued.