JP2001311975A - Image blurring preventing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image blurring preventing device capable of preventing image skipping when an image blurring preventing operation is turned on without deteriorating the image blurring preventing function by starting a correcting lens driving operation after the value of a driving signal for driving the correcting lens becomes zero that shows the stop position of the correcting lens when the image blurring preventing operation is turned on by a start-up switch. SOLUTION: The correction displacement of the correcting lens 38 is obtained by a CPU 32 by integrating the output signal of an angular velocity sensor 30 for detecting the vibration, and then, the obtained value is outputted as the driving signal to a driving circuit 34. In the case the start-up switch 48 is turned off, the driving signal whose value is zero is given to the driving circuit 34 and the correcting lens 38 is stopped at the center. On the other hand, in the case the start-up switch 48 is turned on, an operation of outputting the driving signal to the driving circuit 34 is started at the point of time when the value of the driving signal obtained by the arithmetic operation becomes zero.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image blur prevention apparatus, and more particularly to an image blur prevention apparatus for preventing an image blur in a television camera.

[0002]

2. Description of the Related Art For example, as an image blur prevention device for a camera,
It is known that a correction lens is inserted into a photographing optical system, and the correction lens is displaced in vertical and horizontal directions orthogonal to an optical axis in accordance with vibration of a camera to prevent image blur. For example, in Japanese Patent No. 2918537, a signal output from an acceleration sensor of a camera is integrated by a second-order integrator, and a correction lens is vibrated (camera shake) by a driving unit (voice coil) according to an output of the integrator. An image blur prevention device for displacing the camera in a direction opposite to that of the camera is described.

According to the description of Japanese Patent No. 2918537, when the image blur prevention operation is stopped (off), no signal is input to the driving means, and the correction lens is moved to a specific position. The image blur prevention operation is executed (on) from this state.
Conventionally, when a signal corresponding to the camera vibration is suddenly input to the driving unit, the input signal to the driving unit changes discontinuously, and as a result, the correction lens rapidly moves, so-called image skipping occurs. Problems have been pointed out. And
In order to solve this problem, when the anti-shake operation is switched from off to on, a signal given to the driving means is set to a fixed value (zero value) for holding the correction lens at a specific position.
It has been proposed to start from and vary according to the variation of the output signal of the second order integrator. That is, a differential amplifier is connected between the second-order integrator and the driving means,
The output signal of the second-order integrator is directly input to one input terminal of the differential amplifier, and the output signal of the second-order integrator is input to the other input terminal via a sample / hold circuit. When the image blur prevention operation is off, the signal output from the differential amplifier to the driving means is set to a zero value by holding the sample / hold circuit in a sample state, and the correction lens is held at a specific position (neutral position). When the anti-shake operation is turned on, the output signal of the second-order integrator when the anti-shake operation is turned on is set as a reference value by setting the sample / hold circuit to a hold state,
The difference of the output signal of the second-order integrator with respect to the reference value is output from the differential amplifier to the driving means. As a result, even when the image blur prevention operation is switched from off to on, the signal applied to the driving means does not become discontinuous, and image skipping is prevented.

[0004]

However, in the image blur prevention device described in Japanese Patent No. 2918537, in order to prevent image jump, the second floor when the image blur prevention operation is turned on as described above. Using the output signal of the integrator as a reference value,
Since the correction lens is driven by the variation of the output signal of the second-order integrator with respect to this reference value, there is a problem that the center of the shake of the correction lens deviates from the neutral position (the center position of the movable range of the correction lens). there were. The deflection range of the correction lens is restricted within the movable range.If the center of the correction lens deflection deviates from the neutral position, the maximum deflection range of the correction lens decreases accordingly and the camera vibration increases. There was a possibility that image blur could not be properly prevented.
That is, the image blur prevention performance is deteriorated in order to prevent the image jump.

Further, when the image blur prevention operation is instantaneously started in response to the operation of a predetermined start switch (release button in the above document) as in the image blur prevention apparatus described in the above-mentioned document, the operation of the start switch In some cases, the image blur prevention operation becomes unstable due to vibration or the like caused by the vibration, and the image is unnaturally disturbed.

It is understood that the above-described problem has occurred because it is assumed that image blur is completely prevented at the same time when the start switch is operated. However, many devices such as a lens for a television camera, Alternatively, even with a still camera, there is little need to completely prevent image blurring simultaneously with the operation of the start switch. In view of this, it is possible to solve the above problem in consideration of this point and to prevent the occurrence of unnaturalness due to unnatural fluctuation of the image when the image blur prevention operation is switched from off to on or from on to off. desirable.

The present invention has been made in view of such circumstances, and prevents an unnatural fluctuation of an image when the image blur prevention operation is switched on or off without deteriorating the image blur prevention performance. It is an object of the present invention to provide an image blur prevention device that can perform the above.

[0008]

According to a first aspect of the present invention, there is provided an image forming apparatus, comprising: driving an image blur prevention unit based on a shake state of a device detected by a shake detection unit; In an anti-shake device for preventing blur, a switching unit for switching between execution and stop of the anti-shake operation, and when the anti-shake operation is switched from stop to execution by the switching unit, a certain time elapses from the switching time. Stop the image blur prevention means at a certain position until
And control means for driving the image blur prevention means based on the shake state of the device after the predetermined time has elapsed.

According to a second aspect of the present invention, there is provided an image blur prevention apparatus for preventing an image blur by driving the image blur prevention means based on a shake state of a device detected by the shake detection means. Switching means for performing or stopping the prevention operation; and when the image blur prevention operation is switched from stop to execution by the switching means, the image blur prevention means to be driven to prevent image blur due to a shake state of the device. Until the position coincides with the stop position of the image blur prevention means when the image blur prevention operation is stopped.
The image blur prevention unit is stopped at the stop position, and when the position of the image blur prevention unit to be driven to prevent image blur due to the shake state of the device coincides with the stop position, the device is started from the time. And control means for driving the image blur prevention means based on the shake state of the image.

According to a third aspect of the present invention, there is provided an image blur prevention apparatus for preventing an image blur by driving an image blur prevention means based on a shake state of a device detected by the shake detection means. Switching means for performing or stopping the prevention operation; and when the image blur prevention operation is switched from stop to execution by the switching means, the driving of the image blur prevention means is started and the driving amount of the image blur prevention means is reduced. The image blur preventing means by gradually increasing the drive amount to be driven to prevent the image blur from the drive amount to be driven to prevent the image blur due to the shake state of the device; And control means for driving the.

The invention described in claim 4 is the first invention.
The invention according to any one of claims 3 to 3,
When the image blur prevention operation is switched from execution to stop by the switching means, the control means stops the image blur prevention means at a fixed position.

The invention described in claim 5 is the first invention.
The invention according to any one of claims 3 to 3,
When the image blur prevention operation is switched from execution to stop by the switching means, the control means gradually reduces the drive amount of the image blur prevention means and stops the image blur prevention means at a fixed position.

The invention according to claim 6 is the first invention.
The invention according to any one of claims 5 to 5,
When the image blur prevention operation is stopped by the switching unit, the control unit stops the process of deriving a drive signal for driving the image blur prevention unit, and the image blur prevention operation is performed by the switching unit. Is switched from stop to execution, thereafter, a process of deriving a drive signal for driving the image blur prevention means is started.

According to the first aspect of the present invention, the image blur prevention operation is started after a certain period of time has elapsed after the image blur prevention operation is switched to execution (ON) by the switching means. Can be canceled, and an unnatural fluctuation of the image when the image blur prevention operation is switched from off to on can be prevented.

According to the second aspect of the present invention, when the image blur prevention operation is switched on by the switching means, the position of the image blur prevention means to be driven to prevent the image blur is changed. Since the anti-shake operation is started after waiting for the stop position of the anti-shake means, the image jump can be performed without changing the center of the shake of the anti-shake means from the neutral position (center) as in the related art. Can be prevented. Therefore, it is possible to prevent an unnatural change in an image when the image blur prevention operation is switched from off to on without deteriorating the image blur prevention performance.

According to the third aspect of the present invention, when the image blur prevention operation is switched on by the switching means, the drive amount of the image blur prevention means is gradually increased. Image jumping can be prevented without changing the center of the shake of the image blur prevention means from the neutral position (center), and the influence of vibration or the like caused by the operation of the switching means can be reduced. Therefore, it is possible to prevent an unnatural change in an image when the image blur prevention operation is switched from off to on without deteriorating the image blur prevention performance.

According to the fifth aspect of the present invention, when the image blur prevention operation is switched off by the switching means, the driving amount of the image blur prevention means is gradually reduced to stop at a fixed position. Therefore, even when the image blur prevention operation is switched off, image jump does not occur, and unnatural fluctuation of the image can be prevented.

According to the invention described in claim 6, the process for deriving the drive signal based on the shake state of the device is started after the anti-shake operation is turned on. Energy can be saved without wasting power when the power is off. When the drive signal deriving process is performed by the CPU, the processing capability of the CPU can be effectively used for other processes while the image blur prevention operation is off.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an image blur prevention apparatus according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram showing the configuration of an image blur prevention apparatus according to the present invention. The image blur prevention device shown in the figure is applied to, for example, a lens device of a television camera, and moves a correction lens 38 inserted in an optical system of the lens device in a direction perpendicular to the optical axis based on vibration that causes image blur. Displacement prevents image blur. Here, for the sake of simplicity, it is assumed that the correction lens 38 is displaced only in the vertical direction in the figure, and prevents only image blur due to vibration in that direction. The contents described below can be similarly applied to the image blur prevention operation against the vibration in the direction perpendicular to the paper surface.

As shown in FIG. 1, the image blur prevention device comprises an angular velocity sensor 30, a CPU 32, a drive circuit 34, a motor 3
6, and a correction lens 38 and the like. The angular velocity sensor 30 is attached to a lens device of a television camera or a camera body, and detects shake (vibration) of the television camera. Information (analog signal) indicating the vibration detected by the angular velocity sensor 30 is amplified by the amplifier 40, and after the high-frequency component signal is cut by the low-pass filter 42,
The signal is converted into a digital signal by the A / D converter
Output to U32. The CPU 32 converts the value of the signal given by the angular velocity sensor 30 into an angle amount by integrating (first-order integration) the signal given from the angular velocity sensor 30 as described above, and moves the correction lens 38 to the center (origin) in order to prevent image blur. ) Is calculated (hereinafter, referred to as a corrected displacement amount).

Incidentally, the detector for detecting the vibration of the television camera may be a sensor for detecting acceleration instead of detecting the speed. In this case, a signal given from the sensor is integrated by a second-order integration. Thus, a corrected displacement amount is obtained. Further, the calculation of the correction displacement amount of the correction lens 38 may include processing other than integration. For example, an arithmetic processing is performed so that the center of the shake of the correction lens 38 is located at the center and the center of the shake is returned to the center when the center of the shake is shifted from the center. However, the details of this processing are omitted, and the amount of correction displacement is determined by integrating the signal from the angular velocity sensor 30. In addition, the amount of shake of the correction lens 38 based on the amount of correction displacement determined thereby is calculated. The center shall substantially coincide with the center.

The CPU 32 outputs a signal (drive signal) indicating the amount of correction displacement of the correction lens 38 obtained by calculation to D / A.
The signal is output to the converter 46, converted into an analog signal by the D / A converter 46, and then output to the drive circuit 34. The drive circuit 34 controls the motor 36 based on the applied drive signal.
Is controlled to drive the correction lens 38 in a direction to prevent image blur.
To move. The drive circuit 34 includes the position sensor 4
7, the position of the correction lens 38 is fed back, and the drive circuit 34 performs feedback control so that the position of the correction lens 38 becomes the correction displacement amount instructed by the drive signal from the CPU 32. Move properly.

The above-mentioned image blur prevention operation by the correction lens 38 can be switched between execution (ON) and stop (OFF) by a predetermined start switch 48.
2 detects the ON / OFF state of the activation switch 48 and executes the following processing based on the ON / OFF state. The start switch 48 is provided on a lens device, a camera body, or the like.

First, the case where the start switch 48 is off will be described. When the start switch 48 is off, the CPU 32 does not supply a drive signal to the drive circuit 34,
That is, a drive signal having a zero value is given to the drive circuit 34, and the correction lens 38 is stopped at the center position (center) of the displaceable range. As a result, the image blur prevention operation is turned off. At this time, the CPU 32 may perform the calculation for deriving the correction displacement amount of the correction lens 38, that is, the drive signal, as described above, or may stop such calculation. When the CPU 32 causes the CPU 32 to calculate the drive signal even when the anti-shake operation is off, the CPU 32 does not output the drive signal obtained by the calculation to the drive circuit 34, but drives the drive circuit 34 as described above. The circuit 34 outputs a zero-value drive signal.

On the other hand, when the image blur prevention operation is off, C
In order to cause the PU 32 to stop the calculation of the drive signal, it is possible not only to stop the calculation but also to put the CPU 32 in a sleep mode. That is, when the anti-shake operation is off, the CPU 32 does not allow the CPU 32 to obtain the signal output from the angular velocity sensor 30 nor calculate the drive signal, and also stops the output of the drive signal to the drive circuit 34. Then, it waits until the start switch 48 is turned on. In this case, power consumption when the image blur prevention operation is off is reduced, and power saving is achieved.

When the start switch 48 is off, the angular velocity sensor 30, the amplifier 40, the A / D converter 44,
The operation of each circuit such as the low-pass filter 42 may be stopped to further save power. In the present embodiment, the operation of the drive signal is performed by the CPU 32.
Instead of the operation by the PU 32, the operation can be performed by an analog circuit such as an integration circuit. In this case, when the image blur prevention operation is off, the operation of the analog circuit is stopped to save power. is there.

When the anti-shake operation is off, the position at which the correction lens 38 is stopped does not necessarily have to be at the center, and a drive signal of a constant value is output from the CPU 32 to the drive circuit 34 so that the position is stopped at a predetermined position. The correction lens 38 may be stopped.

Further, when the CPU 32 performs other processing in addition to the calculation of the drive signal in parallel, the CPU 32 is not put into the sleep mode when the image blur prevention operation is off, but the processing is not performed. By performing only this, the processing capacity of the CPU 32 can be used effectively without wasting the computation of the drive signal.

Next, the case where the start switch 48 is switched from off to on will be described. In the embodiment described below, the CPU 32 does not calculate the drive signal while the start switch 48 is off. First, the first embodiment will be described with reference to FIG. 2. While the start switch 48 is off, the correction lens 38
Stops at the center position as shown in the period a in FIG. Assuming that the start switch 48 has been switched from off to on at the time point b shown in the drawing, the CPU 32 starts acquiring a signal from the angular velocity sensor 30 and integrates this signal to correct the displacement of the correction lens 38, that is, , And start the operation of the drive signal. However, the value of the drive signal output to the drive circuit 34 during the period c shown in FIG. Thus, the correction lens 38 is maintained at the center position during the period c.

After a predetermined time (period c) has elapsed since the start switch 48 was turned on, and at the time point d shown in FIG.
The PU 32 outputs a drive signal calculated based on the output signal of the angular velocity sensor 30 to the drive circuit 34, and outputs the drive signal
8 to start the image blur prevention operation. Thereafter, the image blur prevention operation is continued until the start switch 48 is turned off.

As described above, by starting the anti-shake operation after a certain time has elapsed after the start switch 48 is turned on, the vibration generated when the start switch 48 is turned on, and the vibration immediately after the start of the calculation. An unstable drive signal can be canceled. Further, it is also possible to perform processing for stabilizing the drive signal during this fixed time. This prevents image disturbance when the start switch 48 is switched from off to on. Although the calculation of the drive signal is started at the same time when the start switch 48 is turned on, it is not always necessary to start it at the same time.
It may be started before the driving of the correction lens 38 is started. Further, a preferable elapsed time (time of the period c) from when the start switch 48 is turned on to when the image blur prevention operation is started is about 0.2 seconds.

Next, a second embodiment will be described with reference to FIG. In the first embodiment, after a predetermined time has elapsed since the start switch 48 was turned on, the CPU 3
2 outputs a drive signal to the drive circuit 34 and outputs a correction lens 38
Although the image blur prevention operation is started at this time, in the present embodiment, the correction displacement amount of the correction lens 38, that is, the drive signal, The image blur prevention operation is started after the value of has become zero.

As shown in period a in FIG. 3, while the start switch 48 is off, the correction lens 38 is stopped at the center position. If the start switch 48 is switched from off to on at the time point b shown in FIG.
Starts the acquisition of the signal from the angular velocity sensor 30, integrates this signal, and starts the calculation of the correction displacement amount of the correction lens 38, that is, the drive signal. However, immediately after the start switch 48 is turned on, the drive signal obtained by the calculation is not output to the drive circuit 34, and the drive signal of the zero value is supplied to the drive circuit 34 until the drive signal becomes zero. Output. As a result, the correction lens 38 is held at the center position until the drive signal obtained by the calculation becomes zero. Therefore,
The length of the period c in the figure in which the correction lens 38 is held at the center position differs from the first embodiment, and differs according to the situation.

Next, assuming that the drive signal obtained by the calculation becomes zero at time point d in FIG.
The output of the drive signal obtained by the calculation to the drive circuit 34 is started, and the correction lens 38 is driven to start the image blur prevention operation. Thereafter, the image blur prevention operation is continued until the start switch 48 is turned off.

As described above, after the start switch 48 is turned on, the anti-shake operation is started after the drive signal obtained by the calculation becomes zero, so that the image at the start of the anti-shake operation is obtained. Flying can be prevented. Further, since the drive signal is not corrected to prevent the image jump, the center of the shake of the correction lens 38 can be made to substantially coincide with the center, and the image blur prevention performance is deteriorated as in the related art. No failure occurs. Further, as in the first embodiment, the image blur prevention operation is started at least after a lapse of a predetermined time after the start switch 48 is turned on, thereby causing a problem such as vibration generated when the start switch 48 is turned on. Can also be prevented.

Next, the third embodiment will be described with reference to FIG. 4. While the start switch 48 is off, the correction lens 38 stops at the center position as shown in a period a in FIG. I have. At time point b shown in FIG.
Is switched from off to on, the CPU 32
Obtains a signal from the angular velocity sensor 30 and starts calculating a correction displacement amount of the correction lens 38 obtained by integrating the signal, that is, a drive signal. However, after the start switch 48 is turned on, during the period c shown in the figure, the drive signal obtained by the above calculation, that is, the drive signal indicating the amount of correction displacement for preventing image blur is output to the drive circuit 34 as it is. Instead of
The level of the drive signal obtained by the calculation is reduced, and the level of the drive signal is gradually increased with time and output to the drive circuit 34. That is, assuming that the value of the drive signal (correction displacement amount) obtained by the above calculation is a value of 100% and the correction displacement amount at this time is a necessary amount for preventing image blur, the time when the start switch 48 is turned on In b, the value of the drive signal output to the drive circuit 34 is set to 0%. Thereafter, during a period c, the value of the drive signal output to the drive circuit 34 is gradually increased from 0% to a value of 100%, and at a time point d shown in FIG.
The value is set to a value of 0%, that is, a necessary amount for preventing image blurring. After time point d, 100% of the drive signal (required amount) is output to the drive circuit 34 until the start switch 48 is turned off, and the image blur prevention operation is continued.

This makes it possible to prevent image skipping at the start of the image blur prevention operation as in the second embodiment. Further, since the drive signal is not corrected to prevent the image jump, the center of the shake of the correction lens 38 can be made to substantially coincide with the center, and the image blur prevention performance is deteriorated as in the related art. No failure occurs. Furthermore,
After the start switch 48 is turned on, at least until a certain time elapses, the fluctuation width of the correction lens 38 is limited to a small amount. Therefore, the influence of vibration or the like generated when the start switch 48 is turned on is small. Problems due to vibrations and the like can also be prevented.

When the start switch 48 is turned on, the value of the drive signal output to the drive circuit 34 is always 0.
It is not necessary to start from the percentage, but it is sufficient to gradually increase the value from a certain percentage. A suitable elapsed time (time of the period c) from when the start switch 48 is turned on to when the value of the 100% drive signal is output is 0.3.
About 0.5 second.

Next, the case where the start switch 48 is switched from on to off will be described. Start switch 4
8 is switched from on to off, the CPU 32
As described above, a drive signal of a zero value is given to the drive circuit 34,
The correction lens 38 is returned to the center and stopped. At this time, a zero-value drive signal may be immediately supplied to the drive circuit 34 at the moment when the start switch 48 is turned off. However, the value of the drive signal is gradually attenuated and May be returned to the center while the swing width is reduced.

As shown by period a in FIG. 5, while the start switch 48 is on, the correction lens 38 is driven in accordance with the drive signal.
Is displaced. Assuming that the start switch 48 is turned off at the time point b in the figure, the CPU 32 continues to calculate the drive signal during the period c in the figure.
Then, the level of the drive signal obtained by the calculation is gradually reduced with the passage of time and output to the drive circuit 34. That is, assuming that the value of the drive signal (correction displacement amount) obtained by the calculation is a value of 100% and the correction displacement amount at this time is a necessary amount for preventing image blurring, the time point b when the start switch 48 is turned off Then, the value of the drive signal output to the drive circuit 34 is set to 100%. Thereafter, during a period c, the value of the drive signal output to the drive circuit 34 is gradually reduced from 100% to a value of 0%, and at a time point d shown in FIG.
4 so that the value of the drive signal to be output becomes zero. After the time point d, a drive signal of a zero value is output to the drive circuit 34 until the start switch 48 is turned on to stop the image blur prevention operation.

As a result, when the start switch 48 is switched from on to off, the correction lens 38 stops at the center without image skipping, and the switching from on to off of the anti-shake operation is performed without any incongruity. You will be

In the above embodiment, the image blur prevention device in the television lens device has been described. However, the present invention is not limited to this, and can be applied to the image blur prevention device in any device.

[0044]

As described above, according to the image blur prevention apparatus of the present invention, the image blur prevention operation is performed after a predetermined time has elapsed after the image blur prevention operation is switched on (on) by the switching means. By starting the operation, it is possible to cancel the vibration or the like caused by the operation of the switching unit, and to prevent an unnatural fluctuation of the image when the image blur prevention operation is switched from OFF to ON.

When the anti-shake operation is switched on by the switching means, it is waited until the position of the anti-shake means to be driven to prevent the image blur coincides with the stop position of the anti-shake means. By starting the image blur prevention operation, the image jump can be prevented without changing the center of the shake of the image blur prevention means from the neutral position (center) as in the related art. Therefore, it is possible to prevent an unnatural change in an image when the image blur prevention operation is switched from off to on without deteriorating the image blur prevention performance.

When the anti-shake operation is switched on by the switching means, the drive amount of the anti-shake means is gradually increased to start the anti-shake operation. The image jump can be prevented without changing the center of the shake from the neutral position (center), and the influence of vibration or the like caused by the operation of the switching means can be reduced. Therefore, it is possible to prevent an unnatural change in an image when the image blur prevention operation is switched from off to on without deteriorating the image blur prevention performance.

When the anti-shake operation is switched off by the switching means, the driving amount of the anti-shake means is gradually reduced and stopped at a predetermined position, whereby the anti-shake operation is turned off. In this case, an image can be prevented from being unnaturally fluctuated without image skipping.

Also, by starting the drive signal deriving process based on the shake state of the device after the image blur prevention operation is turned on, unnecessary power is not consumed when the image blur prevention operation is off. , Energy saving. When the drive signal deriving process is performed by the CPU, the processing capacity of the CPU can be effectively used for other processes while the image blur prevention operation is off.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an image blur prevention apparatus according to the present invention.

FIG. 2 is an explanatory diagram illustrating a first embodiment of an image blur prevention operation when a start switch is turned on.

FIG. 3 is an explanatory diagram illustrating an image blur prevention operation according to a second embodiment when a start switch is turned on.

FIG. 4 is an explanatory diagram illustrating a third embodiment of an image blur prevention operation performed when a start switch is turned on.

FIG. 5 is an explanatory diagram illustrating an embodiment of an image blur prevention operation when a start switch is turned off.

[Explanation of symbols]

30: angular velocity sensor, 32: CPU, 34: drive circuit,
36 motor, 38 correction lens, 48 start switch

Claims (6)

[Claims] 1. An image blur prevention apparatus for preventing an image blur by driving an image blur prevention means based on a shake state of a device detected by a shake detection means. Means, when the image blur prevention operation is switched from stop to execution by the switching means, the image blur prevention means is stopped at a certain position until a certain time has elapsed from the time of the switching, and when the certain time has elapsed, An image blur prevention device comprising: a control unit that drives the image blur prevention unit based on a shake state of a device. 2. An image blur prevention apparatus for preventing image blur by driving an image blur prevention means based on a shake state of a device detected by a shake detection means. Means, when the anti-shake operation is switched from stop to execution by the switching means, the position of the anti-shake means to be driven to prevent image blur due to the shake state of the device is determined by the anti-shake operation. Until the stop position of the anti-shake means coincides with the stop position of the anti-shake means, the anti-shake means is stopped at the stop position, and the anti-shake means to be driven in order to prevent the image blur due to the shake state of the device And control means for driving the image blur prevention means based on the shake state of the apparatus from the time when the position of the stop position coincides with the stop position. An image blur prevention device characterized by the above-mentioned. 3. An image blur prevention apparatus for preventing an image blur by driving an image blur prevention means based on a shake state of a device detected by a shake detection means. Means for switching the anti-shake operation from stop to execution by the switching means, to start driving the anti-shake means and to change the drive amount of the anti-shake means to an image shake with respect to the shake state of the device. Control means for driving the image blur prevention means by gradually increasing the drive amount to be driven to prevent the image blur from a state where the drive amount is lower than the drive amount to be driven to prevent the image blur. An image blur prevention device, characterized in that: 4. The apparatus according to claim 1, wherein when the image blur prevention operation is switched from execution to stop by the switching unit, the control unit stops the image blur prevention unit at a fixed position. Any one of the above. 5. When the image blur prevention operation is switched from execution to stop by the switching unit, the control unit gradually reduces the drive amount of the image blur prevention unit to stop at a fixed position. Claims 1 to 3
Any one of the above. 6. When the anti-shake operation is stopped by the switching means, the control means stops a drive signal deriving process for driving the anti-shake means, and 6. The method according to claim 1, wherein when the image blur prevention operation is switched from stop to execution, a process of deriving a drive signal for driving the image blur prevention means is started thereafter. 1. An image blur prevention device.