JPH1164907A - Shake correcting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform framing and to enhance the effect of shake correction without the sense of incongruity of a photographer by correcting a shake detecting signal in accordance with the vibrating condition of a shake detecting part. SOLUTION: A position bias table 56 corrects and strains large target driving position information X, and corrects the driving position of a shake correcting lens when the large target driving position information X is inputted. The table 56 is provided with the two kinds of tables, that is, table having large correction amount and the table having small correction amount, and switches the table based on the compared result of a comparator 54. That is, the table 56 is switched from the table having the large correction amount to the table having the small correction amount when the table 56 judges that the information X is large. A speed bias table 57 corrects a driving speed and brings the shake correcting lens back to the center of a movable range or to the vicinity of the center, when the shake correcting lens is driven around a position deviated from the center of the movable range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a camera, a video,
The present invention relates to a shake correction device for correcting shake in an optical device such as binoculars.

[0002]

2. Description of the Related Art Conventionally, a camera shake is detected by an angular velocity sensor, and a shake correction optical system constituting a part or all of a photographing optical system is driven in a direction to cancel the shake, thereby obtaining an image on a film surface. 2. Description of the Related Art A blur correction device that corrects blur is known. The camera shake is composed of three degrees of freedom rotational motion including pitching, yawing and rolling motions, and three rotational motions including x-axis, y-axis and z-axis directions.
It has six degrees of freedom of the linear motion. The conventional blur correction device normally corrects blur for two degrees of freedom motion including pitching and yawing motion.

[0003]

There are roughly two types of blur applied to a camera. One is a blur not intended by the photographer, and is a blur usually called a camera shake. This camera shake affects shooting,
It needs to be corrected. The other is a blur intended by the photographer, for example, a panning operation or a composition change.
When the photographer intends to perform panning shooting and the camera starts to pan in pursuit of the subject, the conventional shake correction device cannot distinguish between panning operation and camera shake. will have to go. For this reason, a phenomenon occurs in which the image in the viewfinder does not move even when the camera is started to be swung sideways.

Similarly, even when the photographer starts to change the composition, the conventional shake correction apparatus cannot distinguish between the composition change operation and the camera shake, so that the composition change operation is corrected and the composition change operation is started. Immediately after that, the blur correction optical system is driven. As a result, the image on the viewfinder does not move even though the photographer has moved the camera to change the composition. When the blur correction optical system is driven to the movable range limit, the blur correction operation becomes impossible, so that the image on the finder starts to move only when the blur correction optical system is driven to the movable range limit. The above phenomenon has a problem that the wider the blur correction range is, the easier it is for the photographer to perceive, and the photographer has difficulty in obtaining the intended composition on the viewfinder. on the other hand,
If the correction range is narrowed to prevent this phenomenon, there is a problem that it is difficult to confirm the effect of the blur correction on the finder.

An object of the present invention is to provide a blur correction device capable of performing framing without giving a photographer an uncomfortable feeling.

[0006]

The present invention solves the above-mentioned problems by the following means. In addition, in order to make it easy to understand, description is given with reference numerals corresponding to the embodiment of the present invention, but the present invention is not limited to this. That is, the first aspect of the present invention provides a shake detecting unit (2x, 2y) for detecting a shake and outputting a shake detection signal (ω), a shake correcting optical system (10) for correcting the shake, and the shake correcting optical system. The shake detection signal is corrected according to the drive unit (3x, 3y) that drives the system and the vibration state of the shake detection unit (S16).
0, S230) Blur detection signal correction unit (56, 57)
And a blur correction device comprising:

According to a second aspect of the present invention, in the shake correction apparatus according to the first aspect, the shake detection signal correction unit corrects a drive position of the shake correction optical system.
6) An image stabilizing apparatus characterized in that:

[0008] The invention of claim 3 is claim 1 or claim 2.
The blur correction device according to any one of claims 1 to 3, wherein the shake detection signal correction unit is a drive speed correction unit (57) that corrects a drive speed of the shake correction optical system.

According to a fourth aspect of the present invention, there is provided a shake detecting unit (2x, 2y) for detecting a shake and outputting a shake detection signal (ω).
A shake correction optical system (10) for correcting shake, a drive unit (3x, 3y) for driving the shake correction optical system, and a position detection unit for detecting a position of the shake correction optical system and outputting a position detection signal (4x, 4y), a target drive position calculation unit (53) for calculating a target drive position of the shake correction optical system based on the shake detection signal, and outputting a target position signal; and a vibration of the shake detection unit. The target position signal is corrected based on the position detection signal according to the state (S160, S23).
0) a target position signal correction unit (56, 57).

According to a fifth aspect of the present invention, in the shake correction apparatus according to the fourth aspect, the target position signal correction unit corrects a drive position of the blur correction optical system.
6) An image stabilizing apparatus characterized in that:

[0011] The invention of claim 6 is the invention of claims 1 to 5.
The shake detecting device according to any one of the above, further comprising a comparing unit (54) for comparing the shake detection signal or the target position signal with a set value ( _Xmax , _Xmin ), and correcting the shake detection signal. The unit or the target position signal correction unit reduces the correction amount of the shake detection signal or the target position signal based on the comparison result of the comparison unit (S1).
60, S230).

The invention according to claim 7 is the invention according to claims 1 to 6.
The shake detecting device according to any one of the above, further comprising: a control unit (58) that drives and controls the driving unit based on the shake detection signal or the target position signal, wherein the control unit performs the shake detection. When the correction amount of the signal or the target position signal is large (S100, S280), the drive unit drives the blur correction optical system at or near the center (I) of the drive range of the blur correction optical system. Is a blur correction device.

The invention of claim 8 is the invention of claim 6 or claim 7.
Wherein the set value is comprised of a maximum set value (X _max ) and a minimum set value (X _min ), and the shake detection signal correction unit or the target position correction unit outputs the shake detection signal. Alternatively, when the target position signal exceeds the maximum set value and falls below the minimum set value within the set time, the correction amount is reduced (S160, S23).
0).

According to a ninth aspect of the present invention, there is provided an image processing apparatus comprising:
In the blur correction device according to any one of the above, the blur detection signal correction unit or the target position correction unit, after changing the correction amount, the blur detection signal or the target position signal within a set time The shake correction device is characterized in that the correction amount is restored when the value does not exceed the maximum set value and does not fall below the minimum set value (S280).

According to a tenth aspect of the present invention, in the shake correction apparatus according to any one of the first to ninth aspects,
The blur correction device according to claim 1, wherein the blur detection signal correction unit or the target position correction unit reduces the correction amount of the blur detection signal or the target position signal during a shooting operation (S290) (S300). is there.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
The embodiment will be described in more detail. First, a blur correction device according to a first embodiment of the present invention will be described using a single-lens reflex camera equipped with the blur correction device as an example. FIG. 1 is a perspective view showing a state where the shake correction apparatus according to the first embodiment of the present invention is mounted on a single-lens reflex camera.
FIG. 2 is a block diagram of the shake correction apparatus according to the first embodiment of the present invention.

The interchangeable lens 8 is detachably mounted on the camera body 1, and the interchangeable lens 8 is
x, 2y, the blur correction lens 10, and the VCMs 3x, 3y
And position detection units 4x and 4y.

The angular velocity sensors 2x and 2y monitor the blurring motion occurring in the camera body 1 and the interchangeable lens 8. As the angular velocity sensors 2x and 2y, usually, piezoelectric vibration type angular velocity sensors for detecting Coriolis force generated by rotation are used. The angular velocity sensor 2x is, as shown in FIG.
The gyro is a gyro that detects a shake in the pitching direction as angular velocity information when the camera body 1 and the interchangeable lens 8 pitch. The angular velocity sensor 2y is an angular velocity meter that detects a shake in the yawing direction as angular velocity information when the camera body 1 and the interchangeable lens 8 yaw. The angular velocity sensors 2x and 2y have the same structure, and the angular velocity sensor 2y is not shown in FIG. The angular velocity sensor 2x has a high frequency noise component and a DC component.
The detected angular velocity information (angular velocity signal) is output to the filter 51x that cuts the component.

The blur correction CPUs 5x and 5y calculate target drive position information corresponding to the blur correction amount, or drive a voice coil motor (hereinafter, VCM) in order to drive the blur correction lens 10 in a direction to cancel the blur amount. 3x)
3y drive or drive stop is performed by PWM drivers 53x, 53
This is a central processing unit that gives instructions to y. Image stabilization CPU
Reference numerals 5x and 5y denote a blur correction lens 1 based on focal length information and lens data transmitted by the lens CPU 7, subject distance information and angular velocity signals transmitted by the main CPU 6.
Target drive position information for driving 0 to the target position is calculated. The shake correction CPUs 5x and 5y drive control the VCMs 3x and 3y based on the position detection information output by the position detection units 4x and 4y and the calculated target drive position information. A shake correction start switch 14 that starts the shake correction device by an ON operation is connected to the shake correction CPUs 5x and 5y. The shake correction CPUs 5x and 5y pass through the filters 51x and 51y, and pass through the A / D converters 52x and 5y.
The digitized (quantized) angular velocity signals are received via 2y. Anti-shake CPU 5x, 5y
Converts the calculated target drive position information into the PWM driver 53
Output to VCMs 3x and 3y via x and 53y, respectively. The illustration of the blur correction CPU 5y is omitted in FIG.

The lens CPU 7 is a central processing unit that outputs, for example, focal length information and lens data read from the EEPROM to the blur correction CPUs 5x and 5y. The lens CPU 7 is connected to an EEPROM 71 in which lens data, which is various kinds of unique information on the interchangeable lens 8, is written. Further, focal length information on the focal length is input to the lens CPU 7.

The blur correcting lens 10 constitutes a part or the whole of the photographing optical system, and is a lens for correcting blur by driving in a direction perpendicular to the optical axis I. The outer peripheral portion of the blur correction lens 10 is held by the inner peripheral portion of the lens frame 11.

The VCMs 3x and 3y drive the blur correction lens 10 in a plane perpendicular to the optical axis I (in the xy plane in the figure). The VCMs 3x and 3y have the same structure, and the VCM 3y is not shown in FIG. 2 and will be described below mainly on the VCM 3x. VCM3
x is the yoke 34x attached to the attachment member 30x
32x that forms a magnetic field between the yoke 34x and the yoke 34x, and a coil 31x that is disposed between the yoke 34x and the magnet 32x and attached to the lens frame 11.
A yoke 33x attached to the surface of the attachment member 35x on the lens frame 11 side and fixing the magnet 32x;
And a wire (not shown) for movably supporting the lens frame 11 in a plane. When the coil 31x is energized, the VCM 3x generates a force in the direction of the arrow in the figure and drives the blur correction lens 10. The VCM 3y generates a driving force in the yaw direction (x-axis direction).

The position detectors 4x and 4y monitor the position of the blur correction lens 10 in a plane perpendicular to the optical axis I. The position detectors 4x and 4y are VCMs 3x and 3
It is provided at a position facing y. Position detector 4x,
4y have the same structure, and the position detector 4y is not shown in FIG. The position detection unit 4x includes a mounting member 40.
x attached to the IRED 41x and the attachment member 44x
One-dimensional PSD43x attached to the IRED4
A slit member 42x that is disposed between 1x and the PSD 43x and that is attached to the outer peripheral portion of the lens frame 11 and that restricts a light beam from the IRED 41x is provided. The position detector 4x has a structure for detecting infrared light emitted from the IRED 41x and incident on the PSD 43x through the slit member 42x. The position detection unit 4x detects the position of the light moving on the PSD 43x by the movement of the slit member 42x, and detects the actual driving position of the blur correction lens 10. The position detection unit 4x is a PSD43x
Outputs the position detection signal (position detection information) output by the CPU to the blur correction CPU 5x via the A / D converter 54x. The position detection unit 4y detects the position of the blur correction lens 20 in the yaw direction (x-axis direction).

The main CPU 6, for example, based on the ON operation of the release switch 60,
5y, the drive of the blur correction lens 10 is instructed, the drive of the film winding mechanism 12 and the shutter mechanism 13 is controlled, the subject distance information is transmitted to the blur correction CPUs 5x and 5y, the first timer 62 and the second timer Turn on timer 63
It is a central processing unit that operates. The main CPU 6 includes a release switch 60, a film winding mechanism 12 for winding a film, a shutter mechanism 13 for opening and closing a shutter, a first timer 62, and a second timer 63.
And are connected. The main CPU 6 also inputs subject distance information relating to the distance to the subject. The main CPU 6 is connected to the blur correction CPU 5 via the lens contact 9.
Communication with x and 5y is possible.

The release switch 60 is a switch for starting a series of photographing preparation operations by a half-pressing operation and starting a photographing operation such as driving of the film winding mechanism 12 and the shutter mechanism 13 by a full-pressing operation.

Next, a method of calculating the angular velocity information to the target drive position information of the shake correction apparatus according to the first embodiment of the present invention will be described. FIG. 3 is a block diagram of a calculation unit of the blur correction CPU in the blur correction device according to the first embodiment of the present invention. Hereinafter, a case where the blur correction lens 10 is driven in the x-axis direction based on the angular velocity information output by the angular velocity sensor 2x will be described as an example.

The angular velocity = 0 algorithm 50 calculates a center value (ω = 0 (zero) value) from the output signal (angular velocity information) ω of the angular velocity sensor 2x. When the output signal ω of the angular velocity sensor 2x fluctuates while the camera body 1 and the interchangeable lens 8 are stationary, the shake correction CP
U5x mistakenly recognizes that the camera body 1 and the interchangeable lens 8 are blurred, and attempts to correct the blur by the blur correction lens 10. For this purpose, it is necessary to calculate the center value of the output signal ω of the angular velocity sensor 2x by the angular velocity = 0 algorithm 50. The angular velocity = 0 algorithm 50 subtracts the calculated center value from the output signal ω of the angular velocity sensor 2x to calculate angular velocity information that needs to be corrected. Angular velocity information Angular velocity =
The 0 algorithm 50 calculates a center value by a moving average method, a digital filter, or the like.

The integrating section 51 integrates angular velocity information that needs to be corrected into angle information θ.

The overflow prevention table 52 prevents an overflow of integration when the angular velocity sensor 2x detects a shake of the camera body 1 and the interchangeable lens 8 as an angular velocity component in the same direction for a long time. FIG. 4 is a diagram illustrating an overflow prevention table in the shake correction apparatus according to the first embodiment of the present invention. As shown in FIG. 4, the overflow prevention table 52 stores the angle information θ after integration.
An output signal is generated according to the magnitude of. When the angle information exceeds -θ1 and falls below θ1, the overflow prevention table 52 does not generate an output signal and is zero. On the other hand, the overflow prevention table 52 outputs a signal having a negative value when the angle information is not less than -θ2 and not more than -θ1, and outputs a signal having a positive value when the angle information is not less than θ1 and not more than θ2. The overflow prevention table 52 prevents overflow by subtracting the generated output signal from the angular velocity information. The overflow prevention table 52 is not used during the exposure operation. If the overflow prevention table 52 is used in a situation where the angle information θ is about to be saturated, the output signal changes the angular velocity information. As a result, the shake correction CPU 5x misrecognizes the fluctuation value as the shake of the camera body 1 and the interchangeable lens 8, and the shake correction lens 10 corrects the fluctuation value.

The ideal target position conversion unit 53 converts the angle information θ after integration into ideal target drive position information (hereinafter, referred to as target drive position information) X of the blur correction lens 10. The ideal target position conversion unit 53 calculates the target drive position information X based on the focal length information f, the blur correction coefficient α, and the subject distance information D, as shown in FIG. Here, the blur correction coefficient α is a ratio of the amount of correction on the film surface to the amount of drive of the blur correction lens 10. The larger the value of the blur correction coefficient α, the more the blur correction lens 10
Requires less drive amount for the same shake. The blur correction coefficient α is represented by a function of the focal length f. The target drive position information X is represented by the following equation when the subject is far away. X = f × θ × β / α (f) Here, θ is the shake angle, and β is a constant. When the subject is close, the blur correction amount is changed using the subject distance information D. The ideal target position conversion unit 53 outputs the calculated target drive position information X to the comparator 54.

The comparator 54 calculates target drive position information X
Counts the number of times _exceeding the comparison values _Xmax and _Xmin . The comparator 54 compares the target drive position information X with preset comparison values (set values) _Xmax and _Xmin , and outputs the target drive position information X as it is. Target drive position information X ′ obtained by subtracting the output signal of the position bias table 56 from the target drive position information X is input to the movable range limiter 55.

The movable range limiter 55 softly regulates the drive range (movable range) of the blur correction lens 10. The movable range limiter 55 is
Is provided inside a mechanical limit that mechanically regulates the drive range of, and its soft limit value is set to ± L. The movable range limiter 55 outputs the target drive position information X ′ to the PID control unit 58.

FIG. 5 is a block diagram of a control unit of the blur correction CPU in the blur correction device according to the first embodiment of the present invention. The PID control unit 58 controls the VCM so that the blur correction lens 10 is driven based on the target drive position information X ′.
3x is controlled. The PID control unit 58
The VCM 3x is controlled based on information obtained by subtracting the position detection information x on the blur correction lens 10 output from the D43x from the target drive position information X '. The PID control unit 58 outputs a signal obtained by subtracting the output signal of the second-order differentiator 59 from the output signal to the PWM driver 53x. PSD43x
Monitors the position of the blur correction lens 10 driven through the PID control unit 58, and outputs the position detection information x to the position bias table 56 and the speed bias table 57.

The second-order differentiator 59 performs second-order differentiation on the position detection information x output from the PSD 43x, and performs a second-order differentiation.
Is calculated. The second-order differentiator 59 subtracts the output signal (second-order differential value) from the output signal of the PID controller 58 so that the motion compensation lens 10 does not move excessively.

The position bias table 56 corrects and distorts the large target drive position information X when the large target drive position information X is input, and shakes the blur correction lens 10 so that a sudden change in speed does not occur. This is for correcting the drive position of the correction lens 10. FIG. 6 is a diagram illustrating a position bias table in the shake correction apparatus according to the first embodiment of the present invention. FIG. 7 is a diagram illustrating target drive position information corrected by the position bias table in the shake correction apparatus according to the first embodiment of the present invention. As shown in FIG. 6, the position bias table 56 includes two types of tables, a table T1 having a large correction amount and a table T2 having a small correction amount. Based on the comparison result of the comparator 54, the table T1 and the table T2 are compared. Switch. The position bias table 56 does not generate an output signal when the position detection information x of the blur correction lens 10 exceeds -x1 and falls below x1, for example, when switching to the table T1. On the other hand, when the position detection information x is not less than -L and not more than -x1 or not less than x1 and not more than L, an output signal as shown in FIG. 6 is generated. As shown in FIG. 3, the output signal of the position bias table 56 is subtracted from the target drive position information X output by the comparator 54. As a result, as shown in FIG. 7, when large target drive position information X (dotted line in the figure) is input, the target drive position information X is distorted as shown by the solid line in the figure, and a sharp speed change occurs in the blur correction lens 10. Will not occur.

However, the target drive position information X is too large (−x
If the target drive position information X is corrected using the table T1 having a large correction amount when the value is 1 or less or x1 or more, the blur correction effect on the finder is reduced. Therefore, when the position bias table 56 determines that the target drive position information X is large based on the comparison result of the comparator 54, the table T1 having a large correction amount
To the table T2 having a small correction amount. As a result, the amount of distortion of the target drive position information X is reduced, and a sufficient shake correction effect can be obtained for large shakes.

The speed bias table 57 corrects the center of the movable range or the center of the movable range by correcting the drive speed of the blur correcting lens 10 when the blur correcting lens 10 is driven around a position deviated from the center of the movable range. The blur correction lens 10 is pulled back to the vicinity. FIG. 8 is a diagram illustrating a speed bias table in the shake correction apparatus according to the first embodiment of the present invention. FIG. 9 is a diagram illustrating target drive position information corrected by the speed bias table in the shake correction apparatus according to the first embodiment of the present invention. The speed bias table 57 does not generate an output signal when the position detection information x of the blur correction lens 10 exceeds −x1 and falls below x1, but when the position detection information x is −L or more and −x1 or less or x1 or more and L or less, FIG. As shown, an output signal is generated. As shown in FIG. 3, the output signal of the velocity bias table 57 is subtracted from angular velocity information that needs to be corrected. As a result, as shown in FIG. 9, in the shake correction lens 10 that drives a position deviated from the center of the movable range, the angular velocity information ω of the dotted line in the figure is corrected as shown by the solid line in the figure, and the center of the movable range or It is pulled back to its vicinity.

Next, the operation of the shake correction apparatus according to the first embodiment of the present invention will be described. FIG. 10 is a flowchart illustrating the operation of the shake correction apparatus according to the first embodiment of the present invention. FIG. 11 is a diagram for explaining the operation of the shake correction apparatus according to the first embodiment of the present invention. Hereinafter, the operation of the comparator 54 and the movable range limiter 55 will be mainly described. In step (hereinafter, S) 100, the position bias table 56 is set in the table T1. When the release switch 60 is half-pressed, the main CPU 6 outputs a shake correction start signal to the shake correction CPUs 5x and 5y, and a power supply unit (not shown) supplies power to the angular velocity sensors 2x and 2y. Further, in synchronization with the half-pressing operation of the release switch 60, the main CPU 6
A half-press timer (not shown) is turned on. Then, immediately after the power is turned on, the shake correction CPUs 5x and 5y set the position bias table 56 to the table T1 having a large correction amount.

In S110, blur correction is started. The shake correction CPUs 5x and 5y start a series of operations based on a shake correction start signal from the lens CPU 6. The blur correction CPUs 5x and 5y determine the ideal target position converter 5 based on the angular velocity information output by the angular velocity sensors 2x and 2y.
3 to calculate the target drive position information X. As shown in FIG. 11, the target drive position information X (dotted line in the figure) is largely corrected by the table T1 within the time set in the table T1, and is distorted into the waveform shown by the solid line in the figure. As a result, since the blur correction lens 10 is driven at or near the optical axis I, which is the center of the movable range, the image in the viewfinder moves during panning or composition change, so that the photographer does not feel uncomfortable. . The target drive position information X is, within the time that select the table T1, blurring is small and less than the comparison value X _max is the maximum set value larger than the comparison value X _min is the minimum set value . As a result, even if the blur correction lens 10 is driven at or near the optical axis I, which is the center of the movable range, the blur correction effect can be sufficiently obtained because the blur is small.

In S120, the first timer 62 is turned on
Operate. In synchronization with the half-pressing operation of the release switch 60, the main CPU 6 instructs the first timer 62 to perform an ON operation.

In S130, the comparator 54
It is determined whether the target drive position information X is larger than the comparison value _Xmax . When the target drive position information X is larger than the comparison value X _max, the process proceeds to S140, the target drive position information X
There when less than the comparison value X _max, the process proceeds to S200.

In S140, the second timer 63 is turned on
Operate. As shown in FIG. 11, the blur width is wide, simultaneous or substantially simultaneously with the target drive position information X exceeds the comparison value X _max, the second timer 63 by the main CPU6 is ON
Operate.

In S150, the comparator 54
It is determined whether the target drive position information X is smaller than the comparison value _Xmax . As shown in FIG.
During the N operation (before timeout), the target drive position information X
Is smaller than the comparison value _Xmin , the comparator 54
Determines that a large blur has entered and the blur width has widened,
Proceed to S160. On the other hand, the target drive position information X is the comparison value X
When it is larger than _min , the process proceeds to S170.

In S160, the position bias table 56 is set in the table T2. As shown in FIG. 11, the target drive position information X has a waveform that is greatly distorted as shown by the solid line in the figure when the shake width increases. As a result, if the position bias table 56 is set to the table T1 having a large correction amount, the target drive position information X is greatly distorted, and the effect of blur correction cannot be obtained.
The comparator 54, when it is determined that a large blur during ON operation of the second timer 63 is input at time T _1, to change the position bias table 56 to a small table T2 of correction amount from the correction amount of the large table T1.
For this purpose, as shown in FIG.
(Dotted line in the figure), compared to when the time T ₀ until time T _1, the distortion amount as shown in solid lines in FIG. At time T ₁ from the time T ₂ becomes small. Further, as shown in FIG. 6, when the width of the flat portion of the position bias table 56 is increased, the correction amount is reduced, so that it is possible to cope with a large blur, and a blur correction effect can be sufficiently obtained.

In S170, it is determined whether the second timer 63 has timed out. Shake correction CPU5
x and 5y determine whether or not the second timer 63 has timed out. If the second timer 63 has timed out, the process proceeds to S180. During the ON operation of the second timer 63,
When the target drive position information X can not fall below the comparison value X _min is the comparator 54, one-way and blur biased, composition change by the photographer, panning or the angular velocity sensor 2x, it determines the drift of 2y. If the position bias table 56 is set to the table T2 having a wide flat portion (small correction amount) at the time of composition change or panning by the photographer, the movement of the image will be delayed with respect to the photographer's movement, and the photographer will feel uncomfortable. Will be given. Therefore, the comparator 54 does not change the position bias table 56 to the table T2. When the second timer 63 has not timed out, the process returns to S150, and the comparator 54 repeatedly determines whether or not the target drive position information X is smaller than the comparison value _Xmax .

In S180, the second timer 63 sets the OF
The F operation is performed, and in S190, the first timer 62 is reset. In S130, the comparator 54 repeatedly determines whether the target drive position information X exceeds the comparison value _Xmax again.

In S200, the comparator 54
It is determined whether the target drive position information X is smaller than the comparison value _Xmin . Target drive position information X does not exceed the comparison value X _max, and, when below the comparison value X _min, the process proceeds to S210, the target drive position information X does not exceed the comparison value X _max, and less than the comparison value X _min If not, the process proceeds to S270.

In S210, the second timer 63 is turned on
In operation, in S220, the comparator 54 determines whether the target drive position information X is larger than the comparison value _Xmax . When the target drive position information X is larger than the comparison value X _max, the process proceeds to S230. Then, in S230, by setting the position bias table 54 to the table T2, it is possible to cope with large blur. on the other hand,
When the target drive position information X is smaller than the comparison value X _max, the process proceeds to S240. In this case, the position bias table 54 is not changed to the table T2 because the photographer changes the composition, panning, or the drift of the angular velocity sensors 2x and 2y. Then, in S240, it is determined whether or not the second timer 63 has run out.
If has not timed out, the flow returns to S220.

In S250, the second timer 63 sets the OF
The F operation is performed, and in S260, the first timer 62 is reset. In S130, the comparator 54 repeatedly determines whether or not the target drive position information X is larger than the comparison value _Xmax .

In S270, it is determined whether the first timer 62 has timed out. Shake correction CPU5
x and 5y determine whether or not the first timer 62 has timed out. If the first timer 62 has timed out, the process proceeds to S280. If the first timer 62 has not timed out, the process proceeds to S290.

In S280, the position bias table 54 is set in the table T1. When the position bias table 54 is set to the table T2 and a large shake is not input during the ON operation of the first timer 62, the position bias table 54 changes from the table T2 having a wide flat portion to the narrow portion having a flat portion. The process returns to the table T1.
Therefore, the correction amount of the target drive position information X increases, and the blur correction lens 10 is driven at or near the optical axis I, which is the center of the movable range. As a result, even if the photographer performs panning or composition change, the image in the viewfinder is less likely to be delayed.

In step S290, the full-press switch is turned on.
It is determined whether or not the operation has been performed. If the release switch 60 has been fully pressed, the process proceeds to S300, and if not, the process proceeds to S310.

In S300, the position bias table 54 is set in the table T2. When the release switch 60 is fully pressed in the middle of this flow, the shake correction CPUs 5x and 5y set the position bias table 54 to a table T2 having a wide flat portion. When the target drive position information X is set in the table T2 having a small correction amount, distortion is less likely to occur, and the target drive position information X is superior as a shooting result. For this reason, during the shooting operation, the blur correction CPU 5x widens the flat portion of the position bias table 54 to prepare for exposure.

In S310, it is determined whether the blur correction has been completed. The CPUs 5x and 5y determine whether to end the blur correction based on the OFF operation of the blur correction activation switch 14 or the timeout of the half-press timer,
When the shake correction ends, this flow ends. On the other hand, when the shake correction activation switch 14 is not turned off or the half-press timer is not timed out, the process proceeds to S13
Returning to 0, it is repeatedly determined whether the target drive position information X is larger than the comparison value _Xmax .

In the shake correcting apparatus according to the first embodiment of the present invention, immediately after the power is turned on, the position bias table 56 is set to the table T1 having a large correction amount. Therefore, the target drive position information X is corrected, and the blur correction lens 10 is positioned at or near the optical axis I, which is the center of the movable range.
Is driven. As a result, when the photographer changes the composition or pans, the blur correction lens 10 is largely driven by the blur correction operation, and the image in the viewfinder does not move, or the image in the viewfinder follows the image with a delay. Can be solved.

During the ON operation of the second timer 63,
When the target drive position information X exceeds the comparison value _Xmax which is the maximum setting value and falls below the comparison value _Xmin which is the minimum setting value, the comparator 54 switches from the table T1 having a large correction amount to the table T2 having a small correction amount. Has changed. Therefore, when a large shake is input, the distortion of the target drive position information X can be reduced by the table T2 having a small correction amount and a wide flat portion, and the shake can be effectively corrected.

Further, after the change to the table T2, the target drive position information X did not exceed the comparison value X _max and did not fall below the comparison value X _min during the ON operation of the first timer 62. Sometimes, the comparator 54 sets the table T
It has returned to 1. For this reason, when no large blur is input, the comparator 54 can quickly change from the table T2 to the table T1, and can respond to panning and composition change by the photographer.

In the shake correcting apparatus according to the first embodiment of the present invention, when the shake correcting lens 10 approaches the movable range limit ± L, the position bias table 56 is controlled to return by a predetermined amount toward the center of the movable range. It has. For this reason, the blur correction lens 10 can be gradually brought closer to the movable range limit ± L and gradually moved away from it. As a result, it is possible to eliminate the uncomfortable feeling of the image blur correction lens 10 colliding with the mechanical limit and abruptly changing the moving speed of the image in the viewfinder, and to reduce the appearance impression of the image on the viewfinder. Can be prevented.

(Second Embodiment) FIG. 12 shows a second embodiment of the present invention.
FIG. 4 is a diagram illustrating a position bias table in the shake correction apparatus according to the embodiment. In the shake correction apparatus according to the second embodiment of the present invention, the position bias table has a shape as shown in FIG. The position bias table shown in FIG.
The movable range (-L1 to L1) when the table T1 is set is smaller than the movable range (-L2 to L2) of the blur correction lens 10 when the table T2 is set. For this reason, immediately after the power is turned on, the position bias table is set in the table T1, so that the image delay in the viewfinder at the time of panning or composition change is reduced.
This can be more effectively prevented as compared with the position bias table 56 shown in FIG.

(Third Embodiment) FIG. 13 shows a third embodiment of the present invention.
FIG. 3 is a block diagram of a calculation unit of a blur correction CPU in the blur correction device according to the embodiment. FIG. 14 is a diagram illustrating a speed bias table in the shake correction apparatus according to the third embodiment of the present invention.

The speed bias table 157 includes a table T1 having a large correction amount and a table T2 having a small correction amount, similarly to the position bias table 56 shown in FIG.
Based on the comparison result of the comparator 54, the table T1
And the table T2. The method of selecting the table T1 and the table T2 is the same as that of the shake correction apparatus according to the first embodiment of the present invention, and thus the detailed description is omitted.

In the shake correcting apparatus according to the third embodiment of the present invention, the comparison result of the comparator 54 is fed back to the position bias table 56 and the speed bias table 57. For example, when the photographer takes a picture while moving the camera body 1 and the interchangeable lens 8, an offset component is added to the blurred waveform. For this reason, with only the position bias table 56, the effect of blur correction decreases as the distance approaches the movable range limit ± L. The speed bias table 57 can enhance the effect of blur correction in order to correct the blur correction lens 10 so as to be pulled back into the movable range.

The position bias table 56 and the speed bias table 57 can correct the target drive position information X so that the blur correction lens 10 is driven at or near the center of the movable range. For this reason, when the camera body 1 and the interchangeable lens 8 are moved, the image in the viewfinder can be brought close to the movement intended by the photographer.

Further, the position bias table 56 and the velocity bias table 57 can be set to tables T2 having a wide flat portion, respectively. Therefore, when a large blur is input, a more natural blur correction effect can be obtained.

(Other Embodiments) The present invention is not limited to the embodiments described above, and various modifications and changes are possible, and these are also within the equivalent scope of the present invention. For example, in the shake correction apparatus according to the first embodiment of the present invention, the overflow prevention table 52, the position bias table 56, and the speed bias table 57 are discontinuous tables.
Similar effects can be obtained by performing calculations using polynomials instead of these tables. Position bias table 56
The speed bias table 157 is not limited to the shapes shown in FIGS.
Any shape may be used as long as the correction range of the table T2 is wider than the correction range of 1. Although the position bias table 56 and the speed bias table 157 use two tables, the table T1 and the table T2, three or more types of tables may be provided with a plurality of comparison values. Further, the effect can be obtained by using only one or both of the position bias table 56 and the velocity bias table 157.

The image stabilizing apparatus according to the first embodiment of the present invention can use the output signal of the position bias table 56 so as not to correct the target drive position information X during exposure. In the shake correction apparatus according to the first embodiment of the present invention, the comparator 55 compares the target drive position signal X with the comparison values X _max and X _min , but the present invention is not limited to this. For example, the angular velocity sensor 2x, the output signal of 2y and comparison value X _max, compared with the X _min, may be switched from the table T1 in table T2 based on the comparison result. Further, based on the angular velocity information ω or the target drive position signal X, it is determined whether the camera body 1 and the interchangeable lens 8 are vibrating due to panning or a change in composition, or vibrating due to camera shake, and based on the determination result. , The table T1 and the table T2 may be switched. further,
Although the blur correction device according to the first embodiment of the present invention has been described by taking as an example a case where the blur correction device is mounted on a single-lens reflex camera, the present invention can be applied to a video camera, binoculars, and the like.

[0067]

As described above in detail, according to the present invention, the shake detection signal correcting section or the target position signal correcting section includes:
The shake detection signal or the target position signal can be corrected according to the vibration state of the shake detection unit. For this reason, by initially setting the correction amount to a large value, it is possible to perform framing without giving the photographer an uncomfortable feeling. Further, by setting the correction amount small, it is possible to sufficiently obtain the effect of blur correction even when excessive blur occurs.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a shake correction apparatus according to a first embodiment of the present invention is mounted on a single-lens reflex camera.

FIG. 2 is a block diagram of the shake correction apparatus according to the first embodiment of the present invention.

FIG. 3 is a block diagram of a calculation unit of a blur correction CPU in the blur correction device according to the first embodiment of the present invention.

FIG. 4 is a diagram illustrating an overflow prevention table in the shake correction apparatus according to the first embodiment of the present invention.

FIG. 5 is a block diagram of a control unit of a blur correction CPU in the blur correction device according to the first embodiment of the present invention.

FIG. 6 is a diagram illustrating a position bias table in the shake correction apparatus according to the first embodiment of the present invention.

FIG. 7 is a diagram showing target drive position information corrected by a position bias table in the shake correction apparatus according to the first embodiment of the present invention.

FIG. 8 is a diagram illustrating a speed bias table in the shake correction apparatus according to the first embodiment of the present invention.

FIG. 9 is a diagram showing target drive position information corrected by a speed bias table in the shake correction apparatus according to the first embodiment of the present invention.

FIG. 10 is a flowchart illustrating an operation of the shake correction apparatus according to the first embodiment of the present invention.

FIG. 11 is a diagram illustrating an operation of the shake correction apparatus according to the first embodiment of the present invention.

FIG. 12 is a diagram illustrating a position bias table in a shake correction apparatus according to a second embodiment of the present invention.

FIG. 13 is a block diagram of a calculation unit of a blur correction CPU in a blur correction device according to a third embodiment of the present invention.

FIG. 14 is a diagram showing a speed bias table in a shake correction apparatus according to a third embodiment of the present invention.

[Explanation of symbols]

2x, 2y Angular velocity sensor 3x, 3y VCM (voice coil motor) 4x, 4y Position detector 5x, 5y Blur correction CPU 10 Blur correction lens 53 Ideal target position detector 54 Comparator 55 Movable range limiter 56 Position bias table 57, 157 Speed Bias table 58 PID control unit I Optical axis X Target drive position information _Xmax , _Xmin comparison value x Position detection information ω Angular velocity information

Claims (10)

[Claims] A shake detection unit that detects a shake and outputs a shake detection signal; a shake correction optical system that corrects the shake; a drive unit that drives the shake correction optical system; and a vibration state of the shake detection unit And a shake detection signal correction unit that corrects the shake detection signal in accordance with the following. 2. The blur correction device according to claim 1, wherein the blur detection signal correction unit is a drive position correction unit that corrects a drive position of the blur correction optical system. . 3. The blur correction device according to claim 1, wherein the blur detection signal correction unit is a drive speed correction unit that corrects a drive speed of the blur correction optical system. Shake correction device. 4. A blur detecting unit that detects blur and outputs a blur detection signal, a blur correcting optical system that corrects blur, a driving unit that drives the blur correcting optical system, and a position of the blur correcting optical system. A target drive position calculation unit that calculates a target drive position of the shake correction optical system based on the shake detection signal, and outputs a target position signal. And a target position signal correction unit that corrects the target position signal based on the position detection signal according to a vibration state of the shake detection unit. 5. The blur correction device according to claim 4, wherein the target position signal correction unit is a drive position correction unit that corrects a drive position of the blur correction optical system. . 6. Any one of claims 1 to 5
The shake detecting device according to claim, further comprising: a comparison unit that compares the shake detection signal or the target position signal with a set value, wherein the shake detection signal correction unit or the target position signal correction unit compares the comparison unit. A correction amount for correcting the shake detection signal or the target position signal based on a result. 7. One of claims 1 to 6
The shake detecting device according to any one of the preceding claims, further comprising: a control unit that drives and controls the driving unit based on the shake detection signal or the target position signal, wherein the control unit corrects the shake detection signal or the target position signal. When the amount is large, the blur correction optical system is driven by the drive unit at or near the center of the drive range of the blur correction optical system. 8. The blur correction device according to claim 6, wherein the set value includes a maximum set value and a minimum set value, and the shake detection signal correction unit or the target position correction unit includes: The correction amount is reduced when the shake detection signal or the target position signal exceeds the maximum set value and falls below the minimum set value within a set time. 9. Any one of claims 6 to 8
In the blur correction device according to the item, after the blur detection signal correction unit or the target position correction unit changes the correction amount, the blur detection signal or the target position signal changes the maximum set value within a set time. The correction amount is restored when the value does not exceed the minimum set value and does not fall below the minimum set value. 10. The blur correction device according to claim 1, wherein the blur detection signal correction unit or the target position correction unit is configured to output the blur detection signal or the target position during a shooting operation. An image stabilizing device, characterized in that the correction amount of a target position signal is reduced.