JPH0540291A - Camera with shaking correcting function - Google Patents

Abstract

PURPOSE:To always effectively prevent the generation of blurring regardless of a focal distance or an object distance even when shaking is generated at the camera in the case of photographing the picture. CONSTITUTION:A sensor 6a composed of an acceleration meter detects the shaking generated at the camera in the case of photographing the picture while pushing a release switch 21. The shaking detection data of this shaking sensor 6a are sampled by a sampling circuit 6b at every fixed time, stored in a first memory 11a and inputted to an arithmetic circuit 10, and shaking correction data are calculated and stored in a second memory 11b. Based on the this-time and previous shaking detection data and this-time correction data, the arithmetic circuit 10 calculates the next shaking correction data while considering focal distance data and/or object distance data. While receiving these correction data, a correcting actuator 9 drives an optical member 5 for correction so as to cancel the move of an image position caused by the blurring on a film plane 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera with a camera shake correction function, and more specifically, it detects camera shake occurring in the camera body and based on the detected value, a single focal length or variable focal length photographing optical system. The present invention relates to a camera with a camera shake correction function which drives a correction optical member inserted in the optical path to cancel the image movement on the film surface.

[0002]

2. Description of the Related Art Generally, a camera with an image stabilization function (hereinafter abbreviated as "camera") has a camera as shown in FIGS. 14 and 15 when a zoom lens is used as a photographing optical system. A photographing optical system 1 is provided integrally with the main body or detachably via a lens mount,
The film surface 2 is located behind the optical axis O.

The photographing optical system 1 has a focus lens group 3 formed of a plurality of lenses and a zoom lens group 4 formed of a plurality of lenses, and a correction optical member 5 is provided in this optical path. Has been inserted.

Then, the focus lens group 3 is driven in focus by a focus command signal Df which is an output of a control circuit (not shown), and the zoom lens group 4 is driven by the zoom command signal Dz.
Zooming is performed by the camera, and the correction optical member 5 is driven by the camera shake correction command signal Da.

Next, how each of the focus lens group 3, the zoom lens group 4, and the correction optical member 5 is driven will be described. In this example, the focus lens group 3 has a telephoto focal length. It is displaced to the front side as it is moved to the side, and is displaced to the front side as the subject distance is set to the close side.

The zoom lens group 4 is displaced forward as the focal length is set to the telephoto side, and similarly the correction optical member 5 is used.
Is also displaced forward as the zoom lens group 4 is driven to the telephoto side.

Next, a specific form of the camera shake correction command signal Da will be described. When the vibration of the camera shake that occurs in the camera body has a substantially sinusoidal characteristic “a” in which the amplitude moves in the ± directions as a boundary as shown in FIG. 16, the camera shake is first corrected in order to correct the camera shake. The camera shake detection unit detects the speed V in a very short period of time, calculates the camera shake change amount data B _k based on the detection data at this time, and obtains it, and based on the camera shake change amount data B _k , the camera shake correction command signal Da. The image movement on the film surface 2 is eliminated by driving the correction optical member 5 in the direction in which the movement due to the camera shake is canceled.

However, the corrected motion is always delayed as indicated by the symbol b. That is, as shown in an enlarged view in FIG. 17, blur detection times t-2It, t-It, t, t + It (however, I
(t: integration time at each time), based on the shake detection value obtained at each time, the shake change amount data B _k , B at each time
The calculated _k-1, the blur variation data _{B k, B k-1} from the camera moving velocity data _{V k,} determine the _{V k-1,} the data _{V k, V k-1} image stabilization command signal based on Da
Is being generated.

Therefore, the movement of the image on the film surface is the corrected characteristic f when it is corrected by the correction amount characteristic d with respect to the blur amount characteristic e as shown in FIG.

Therefore, as the camera shake correction, only an improvement effect of about 1/4 of the camera shake amount of the camera body can be obtained.

In order to improve this, there is a system in which an input to a drive circuit to the correction optical member is controlled so as to converge vibration of camera shake of the camera body when driving the correction optical system.

Specifically, for example, Japanese Patent Laid-Open No. 1-30022.
As disclosed in Japanese Patent Laid-Open No. 1-58, the amplification factor of the drive circuit to the correction optical member is changed according to the output of the shake detection unit, that is, it is changed so as to converge the camera shake vibration of the camera body. There is something.

Further, as another means for converging camera shake vibration by using the electric means, that is, the means for changing the amplification factor of the drive circuit as described above, as disclosed in the publication, the In some cases, the camera shake correction is improved by varying the rigidity of a vibration sensor for detecting camera shake so as to converge the camera shake vibration.

On the other hand, the blur correction driving amount changes in absolute amount depending on the size of the subject distance, and this description will be described with reference to FIG.

In the photographic optical system R having the film surface 2 inside the rear side of the camera body P and having the principal point Q inside the front side, the camera body P is moved upwardly with respect to the optical axis O by a distance y ^1. If only moved, the knotting point for point A ¹ is
Intersection A between the straight line connecting the points A ¹ and B ² and the film surface 2
It will be ³ . The above-mentioned point B ² is a point above the intersection B ¹ of the vertical line of the principal point Q and the optical axis O by the distance y ¹ .

On the other hand, the initial position of the camera body P (before the movement)
Point A in The tie point of 1 is point A^TwoAnd this point
A^TwoIs a point A on the film surface 2 after the camera is moved.^Four
(Point A^TwoDistance from y¹Corresponding to the point (moved only upward)
Therefore, the camera body P moves upwards at a distance y.¹Just moved
This means point A if you consider film surface 2 as a reference.^FourIs point A
^ThreeThe same as moving to.

Here, considering a method of preventing the skeleton position from moving even if the camera body P moves upward by a distance y1, the straight line connecting the points A ¹ and A ⁴ and the principal point Q position. Adjustment should be made so that the photographing optical system is moved to the intersection point B ³ with. This movement amount (difference between point B ² and point B ³ ) is defined as distance y ^2, and the distance from the principal point Q to the film surface 2 is x.
^1, and if the distance from point ^{A 1} to principal point Q and ^{x 2, y 1 / (x} 1 + x 2) = (y 1 -y 2) / x 2 is established, the distance ^{y 2} is, y ² = {x ¹ / (x ¹ + x ² )} · y ¹ .

Therefore, the distance y ² is affected by the distance x ² (subject distance). Therefore, it is desirable to correct the camera shake correction command signal Da described with reference to FIG. 6 above using the subject distance data.

[0019]

In the conventional camera, camera shake detection is performed, the drive amount of the correction optical member is calculated based on the detection result, and the correction optical member is driven based on the calculation result. As a result, the following problems occur.

That is, since a time delay (see reference numeral c in FIG. 15) inevitably occurs between the camera shake detection time point, the calculation end time point, and the driving time point, camera shake can be improved to some extent. There is a drawback in that the amount of undercorrection always occurs due to the delay that occurs in the image stabilization system.

Even with such a conventional method, when the absolute amount of camera shake that occurs in the camera is relatively small, this insufficient correction amount is also small, and therefore the correction means in the conventional device has a substantial problem. Although not present, a large amount of undercorrection will always occur if the absolute amount of camera shake is large.

Further, although the blur correction amount actually required changes depending on the focal length in the photographing optical system, that is, as the focal length increases even if the blur amount of the camera itself is the same, on the film surface. Despite the large movement of the image position of, the measures are not taken and only a relatively rough control is performed.

For example, assuming that the variation width of the focal length in the photographing optical system is from about 35 mm at wide angle to about 70 mm at telephoto, for example, camera shake correction drive is performed with reference to the most telephoto side which is the most severe condition. In this case, when the focal length of the shooting optical system is on the wide-angle side, camera shake correction is performed more than necessary, so camera shake correction drive is not performed accurately,
The overall accuracy cannot be improved.

Further, although the blur correction amount actually required changes depending on the subject distance at the time of photographing, that is,
Even if the camera shake amount is the same, as the subject distance becomes smaller (closer to the camera), the movement of the image position on the film surface becomes larger, but this measure is not taken. There is only a rough control of the proportion.

More specifically, based on the distance that will appear most frequently among the subject distances at the time of photographing,
Since the correction optical member is driven by the camera shake correction drive amount at this time, it is not possible to perform satisfactory camera shake correction over the entire range from the closest subject distance to infinity.

The present invention has been made in order to solve the above-mentioned problems, and the first object of the present invention is not only when the absolute amount of camera shake that occurs in a camera is small but also when it is large. An object of the present invention is to provide a camera that corrects camera shake effectively and appropriately and does not cause camera shake in a photographed image.

A second object of the present invention is not only when the absolute amount of camera shake that occurs in the camera is small but also when it is large, and in the variable focal length photographing optical system, any focal length (EN) Provided is a camera which effectively corrects a camera shake even when set and prevents a photographed picture from being shaken.

A third object of the present invention is not only when the absolute amount of camera shake that occurs in the camera is small but also when it is large, and even when the subject is located at any distance. An object of the present invention is to provide a camera that corrects camera shake effectively and appropriately and does not cause camera shake in a photographed image.

[0029]

In order to achieve the first object, the invention of claim 1 is directed to a photographing optical system for correcting the movement of the image position on the film surface caused by the camera shake of the camera body. Correction optical member inserted in the optical path of the camera, a shake correction actuator for moving or tilting the correction optical member in a required direction, and camera shake of the camera body is converted into an electric signal to obtain camera shake detection data. The camera shake detection unit, the first storage means for temporarily storing the camera shake detection data from the camera shake detection unit, the movement of the image position on the film surface due to the camera shake of the camera body, and the correction optical member described above. Comprising: a calculation means for calculating shake correction data for driving and correcting by a shake correction actuator; and a second storage means for temporarily storing output data of this calculation means. The calculating means, the shake of the current obtained by the detector camera shake detection data and the first previous hands stored in the storage unit shake detection data and the second
In order to predict the movement of the image position on the film surface due to the camera shake on the film surface based on the previous shake correction data stored in the storage means, by driving the correction optical member by the shake correction actuator. It is characterized in that it is configured to calculate blur correction data.

Further, in order to achieve the first object,
According to a second aspect of the present invention, there is provided a correction optical member inserted in the optical path of the photographing optical system for correcting the movement of the image position on the film surface caused by the camera shake of the camera body, and the correction optical member. A camera shake correction actuator that moves or tilts in a necessary direction, a camera shake detection unit that converts camera shake of the camera body into an electric signal to obtain camera shake detection data,
The first storage means for temporarily storing the camera shake detection data from the camera shake detection section and the movement of the image position on the film surface due to the camera shake of the camera body drive the correction optical member by the camera shake correction actuator. And a second storage means for temporarily storing the output data from the calculating means, which is obtained by the camera shake detecting section by the calculating means. On the basis of the current camera shake detection data, the previous and previous camera shake detection data stored in the first storage means, and the previous camera shake correction data stored in the second storage means, the film surface caused by camera shake For the movement of the image position above, the blur correction data for calculating the correction optical member by driving the correction optical member by the blur correction actuator next time is calculated. Is obtained is characterized in that configuration it was.

In order to achieve the first object, the invention according to claim 3 further provides a camera shake detection unit according to claim 1 or 2 for a predetermined period of time by detecting an acceleration generated in the camera body. It is characterized by being configured so as to generate the camera shake detection data by integrating with.

In order to achieve the above-mentioned second object, the invention of claim 4 is arranged in the optical path of the variable focal length photographing optical system for correcting the movement of the image position on the film surface caused by the camera shake of the camera body. A correction optical member inserted in the camera, a shake correction actuator for moving or tilting the correction optical member in a required direction, and a shake detection unit for converting the shake of the camera body into an electric signal to obtain shake detection data. A first storage means for temporarily storing the camera shake detection data from the camera shake detection section, a zoom position detection means for detecting the focal length in the photographing optical system to obtain zoom position data, and a camera shake of the camera body. The movement of the image position on the film surface due to is calculated by driving the correction optical member by the blur correction actuator to calculate blur correction data. Means and a second storage means for temporarily storing the output data of the arithmetic means, and the present camera shake detection data obtained by the camera shake detecting section by the arithmetic means and the first storage means. The movement of the image position on the film surface due to the shake of the camera body is corrected based on the previous camera shake detection data stored in and the previous camera shake correction data stored in the second storage means. Is configured to be driven by the blur correction actuator to calculate blur correction data for correction prediction and to perform focal length correction on the blur correction data based on the zoom position data obtained by the zoom position detection means. It is characterized by.

Further, in order to achieve the above second object,
According to a fifth aspect of the present invention, a correction optical member is provided in the optical path of the variable focal length photographing optical system for correcting the movement of the image position on the film surface caused by the camera shake of the camera body, and the correction optical member. A camera shake correction actuator that moves or tilts the optical member in the required direction, a camera shake detection unit that converts camera shake of the camera body into an electrical signal to obtain camera shake detection data, and the camera shake detection data from this camera shake detection unit is temporarily stored. A first storage means for storing the zoom position, a zoom position detecting means for detecting the focal length in the photographing optical system to obtain zoom position data, and a movement of the image position on the film surface due to the camera shake of the camera body. The calculation means for calculating the shake correction data for correcting the driving optical member by the shake correction actuator and the output data in this calculation means Second storage means for temporarily storing the same, and the camera shake detection data of this time obtained by the camera shake detection section by the calculation means and the camera shake detection data of the previous time and the previous two times stored in the first storage means. And the movement of the image position on the film surface due to the shake of the camera body based on the previous shake correction data stored in the second storage means, the correction optical member is driven next time by the shake correction actuator. It is characterized in that blur correction data for correction prediction is calculated and the focal length correction is performed on the blur correction data based on the zoom position data obtained by the zoom position detecting means.

In order to achieve the third object, the invention of claim 6 interposes in the optical path of the photographing optical system in order to correct the movement of the image position on the film surface caused by the camera shake of the camera body. A correction optical member, a shake correction actuator that moves or tilts the correction optical member in a required direction, a shake detection unit that converts shake of the camera body into an electric signal to obtain shake detection data, First storage means for temporarily storing the camera shake detection data from the camera shake detection section, distance measuring means for measuring the distance to the object to obtain object distance data, and an image on the film surface due to camera shake of the camera body. Computation means for computing blur compensation data for compensating the movement of the position by driving the compensation optical member by the blur compensation actuator and output data of this computation means A second storage means for temporarily storing, and the current shake detection data obtained by the shake detection section by the calculation means and the previous shake detection data stored in the first storage means. Based on the previous shake correction data stored in the second storage means, the movement of the image position on the film surface due to the shake of the camera main body,
It is configured such that the correction optical member is driven by the shake correction actuator to calculate shake correction data for correction prediction and correction calculation according to subject distance data obtained by the distance measuring means. It is a feature.

Further, in order to achieve the third object,
According to a seventh aspect of the present invention, there is provided a correction optical member which is inserted in an optical path of a photographing optical system for correcting movement of an image position on a film surface caused by camera shake of the camera body, and the correction optical member. A camera shake correction actuator that moves or tilts in a necessary direction, a camera shake detection unit that converts camera shake of the camera body into an electric signal to obtain camera shake detection data,
The first storage means for temporarily storing the camera shake detection data from the camera shake detection section, the distance measuring means for measuring the distance to the subject to obtain the subject distance data, and the camera body on the film surface due to the camera shake Computation means for computing blur compensation data for compensating the movement of the image position by driving the compensation optical member by the blur compensation actuator, and a second memory for temporarily storing output data from this computation means. Means for calculating the current camera shake detection data obtained by the camera shake detection section by the calculation means, and the first camera shake detection data.
The movement of the image position on the film surface due to the blur of the camera main body is calculated based on the previous and previous camera shake detection data stored in the storage means and the previous blur correction data stored in the second storage means. It is configured such that the correction optical member is driven next time by the shake correction actuator to calculate shake correction data for correction prediction and correction calculation according to the subject distance data obtained by the distance measuring means. It is characterized by.

[0036]

In the camera according to the present invention, in order to correct the movement of the image position on the film surface caused by the camera shake of the camera body, the correction optical member inserted in the optical path of the photographing optical system is designated. When driving the camera shake correction actuator that moves or tilts, the camera shake detection data obtained by converting the camera shake of the camera body into an electric signal using the camera shake detection unit is temporarily stored in the first storage means, Based on the camera shake detection data stored in the first storage means, the shake correction data is calculated using the calculation means, and the output data of this calculation means is temporarily stored in the second storage means.

In this case, the calculation means is based on the camera shake detection data of the camera shake detection section, the camera shake detection data stored in the first storage means, and the camera shake correction data stored in the second storage means. , Or the blur correction data for predicting the movement of the image position on the film surface by driving the correction optical member based on the subject distance data measured by the distance measuring means to a first-order or second-order approximation. If the shooting optical system is a variable focal length type, the correction data obtained in this way
The prediction calculation is performed by adding the correction according to the focal length, and the camera shake correction is performed corresponding to the prediction data obtained by the calculation means.

The data necessary for making these predictions are collected twice this time and last time, or three times this time and last time and the time before last.

Further, the camera-shake detecting section detects, for example, the acceleration generated in the camera body and integrates it over a predetermined period to generate camera-shake detection data.

[0040]

Embodiments of the present invention will be described below in detail with reference to FIGS. In FIG. 1, which shows the circuit configuration of the first embodiment of the present invention, the light of an image pickup optical system 1 that is integrated with the camera body as seen in a compact camera, or is detachably provided via a lens mount or the like. The film surface 2 is located on the axis O.

This photographing optical system 1 has a focus lens group 3 formed of a plurality of lenses, a zoom lens group 4 formed of a plurality of lenses, and optical axes of these two lens groups 3 and 4. It is composed of a correction optical member 5 for correcting according to camera shake. Further, the camera body is provided with a camera shake detection unit 6. This camera shake detection unit 6
Is formed of a blur sensor 6a and a sampling circuit 6b for sampling the output. The blur sensor 6a can use, for example, a semiconductor type acceleration sensor, and the sampling circuit 6b performs sampling at predetermined time intervals. is there.

On the other hand, each of the focus lens group 3 and the zoom lens group 4 has a focus motor 7 and a zoom motor 8 for electrically focusing and zooming.
The correction optical member 5 is provided with a shake correction actuator 9 for driving the correction optical member 5 in a direction orthogonal to the optical axis O.

The output end of the blur sensor 6a is connected to the input end of the sampling circuit 6b, and the output end of the sampling circuit 6b, that is, the output end of the camera shake detection unit 6 is connected to the input end of the arithmetic means 10. A storage means 11 is connected to the arithmetic means 10.

Further, a focus drive circuit 12, a zoom drive circuit 13 and an actuator drive circuit 14 are connected to the focus motor 7, the zoom motor 8 and the blur correction actuator 9, respectively.

Further, a CPU 15 for issuing a command for compositely controlling the respective parts provided in the camera body is provided, and the CPU 15 has an AF circuit 16 for performing distance measurement and automatic focusing drive. Are connected.

As the AF circuit 16, for example, an active type can be used as shown in FIG.

That is, the distance D from the camera body (not shown)
The light of the infrared light emitting diode LED is projected toward the object OJ located at a certain position using the light projecting lens L ¹ , and at this time, the reflected light from the object OJ is projected by the light projecting lens L ¹ and the light emitting diode LED. A light is received by a position sensor, for example, a PSD (position sensitive device), via a light receiving lens L ² which is arranged with a base length S with respect to the light projecting portion formed by.

This position sensor PSD includes a light receiving lens L ²
Is disposed on the focal length f of the and its length is set to c.

[0049] Thus, the spot light reflected by the object OJ is made to be imaged to a point comprising a reference point of the position sensor PSD at a distance d, the output current I ■ ^I of the position sensor ^PSD, the I ² The relationship is as shown below.

( ¹ ) I ¹ ∝ (C / 2) -d = (C / 2) + (f / D) ・ S I ² ∝ (C / 2) + d = (C / 2) + (f / D) ・S Therefore, I ² / I ¹ = {(C / 2) + (f / D) · S}
/ {(C / 2) − (f / D) · S} = (C · D + 2f · S) / (C · D−2f · S) That is, the output I corresponding to the reciprocal of the subject distance (1 / D)
^{Since 2} / I ¹ will be generated, this I ² / I ¹ is
The output of the AF circuit 16, that is, the subject distance data Dx can be used.

The output end of the AF circuit 16, that is, the sending end of the object distance data Dx is the AF data conversion circuit 1.
This AF data conversion circuit 1 is connected to the first input terminal 7
The output terminal 7 of the focus driving data Dfx is connected to the first control terminal of the focus driving circuit 12.

An output end of a photo interrupter 18 for generating pulse number data Pix according to the rotation of the focus motor 7 is connected to a second control end of the focus drive circuit 12.

On the other hand, the photographing optical system 1 is provided with a zoom position detecting circuit 19 for detecting the current position of the zoom lens group 4 to obtain zoom position data. The sending end of the zoom position data Zpx is connected to the second control end of the AF data conversion circuit 17 and also to the first control end of the zoom drive circuit 13 described above. The output end of the CPU 15, that is, the output end of the zoom drive amount data Z ′ is connected to the second control end of the zoom drive circuit 13.

Further, the photometric circuit 20 is connected to the CPU 15 so that desired photometric control can be executed. Further, at each input terminal of the CPU 15,
A release switch 21 for activating the release, a photometric switch 22 for starting photometry, and a zoom switch 23 for performing zooming are also connected.

Further, a feeding motor 24 for performing a series of operations such as film winding and shutter charging is provided, and the feeding motor 24 is provided with a feeding driving circuit 25 connected to an output end of the CPU 15. The rotation is controlled according to the feeding command from the CPU 15.

Reference numeral 26 is a memory for temporarily storing fixed data for causing the CPU 15 to execute a predetermined program and data required for various controls.

Now, the basic configuration of the above-mentioned arithmetic means 10 is as follows.
The first, second and third arithmetic circuits 10a, 10b and 10c are sequentially connected in series, and the storage means 11 includes a first memory 11a and a second storage as a first storage means. It has a second memory 11b as means.

The above-mentioned first arithmetic circuit 10a uses V ^k = f (V ^k-1 , B ^k , B ^k-1 ) where V ^k : (current) camera moving speed data V ^k-1 :( and requests the previous) camera moving velocity data B ^k :( this time) shake variation data B ^k-1 :( last) shake variation data.

The second arithmetic circuit 10b receives the current camera movement speed data V ^k and A obtained by the first arithmetic circuit 10a.
The blur correction reference drive data BLwide, that is, BLwide = f (V ^k , Dx) is calculated from the subject distance data Dx output from the F circuit 16, and the third calculation circuit 10c is the second calculation circuit 10b. Blur correction reference drive data BLwi obtained in
The blur correction amount data BLzp, that is, BLzp = f (BLwide, Zpx), is obtained from de and the zoom position data Zpx obtained by the zoom position detection circuit 19.

On the other hand, the input end of the above-mentioned first memory 11a is connected to the output end of the sampling circuit 6b, that is, the output end of the camera shake detection section 6, and the output end of the first memory 11a is subjected to the first calculation. It is connected to the first input terminal of the circuit 10a. The output terminal of the first arithmetic circuit 10a is connected to the input terminal of the second memory 11b, and the output terminal of the second memory 11b is connected to the second input terminal of the first arithmetic circuit 10a. There is.

Next, the camera shake correction operation in the camera with a camera shake correction function according to the present embodiment configured as described above will be described.

Step S1 of the flowchart shown in FIG.
When the main switch is turned on, power is supplied to each part of the circuit, each part of the circuit is initialized to execute a predetermined program stored in the memory 26, and a control signal is sent from the CPU 15 to the camera shake detection part 6. , The blur sensor 6a and the sampling circuit 6b operate,
A sambling operation for detecting camera shake is started, and it is determined in the next step S2 whether or not sampling is started. If NO, the process waits until sampling is started.

Here, the shake variation amount data B ^k obtained as the output of the camera shake detecting unit 6 is given as a dimension as velocity data obtained by integrating the output A ^k of the shake sensor 6a at the sampling interval St for a certain period It. Be done.

A schematic representation of this situation is shown in FIG. 5, in which the output A ^k of the blur sensor 6a is used as the start point S.
From n, sampling is performed n times, for example, 32 times at a minute sampling interval St, and integration is performed for a certain period It, so that shake variation data as shown in the following equation is obtained.

[0065]

[Equation 1] When it is determined that the sampling performed in this manner is started, that is, step S2 is branched to YES, and the process proceeds to the next step S3. This step S3
Is for collecting offset data.

Here, the reason why the offset data is ^obtained is that the shake variation amount data B ^k corresponding to camera shake occurring in the camera body is a difference from the output A ^k of the shake sensor 6a when the acceleration is zero. The output B ¹ , B ^{2 of} each time obtained for this purpose is obtained.
Offset data Bof from B ^{k as} shown in the following equation
This is because it is necessary to subtract fset.

[0067]

[Equation 2] In this way, after the offset data is obtained, the process proceeds to the next step S4, and it is determined whether or not the release button is half-pressed. If NO, the process returns to step S3, and if YES. Then, the process proceeds to the next step S5 and the zoom position data Zp obtained by the zoom position detection circuit 19
x is stored, the photometry circuit 20 operates based on a command from the CPU 15, and photometry and exposure calculation are performed.

Then, the process proceeds to the next step S6,
Data BoL (t) for checking the amount of blur
Is obtained from the check data Box and the zoom position data Zpx as BoL (t) = f (Bok, Zpx).

Then, the process proceeds to the next step S7, and it is determined whether or not the above-mentioned data BoL (t) is equal to or larger than the predetermined reference data C ^1. If NO, the process proceeds to the next step S8. Then, the flag indicating that the focus motor 7 is rotating, that is, the ^Mf flag is set to "1", and the flag shown in FIG.
Step S17 and Step S4 of the flowchart shown in FIG.
4 are moved in parallel.

On the other hand, if YES at step S7,
Since the amount of camera shake in the camera body is so large that it cannot be corrected, it is determined that the photographer intentionally moves the camera body, for example, pans a subject that moves at high speed, and decides not to perform camera shake correction. , Step S9.

In step S9, the inhibition signal I is sent from the CPU 15 to the sampling circuit 6b of the camera shake detection unit 6 to stop sampling. Then, the process shifts to the next step S10 to perform photometry and distance measurement for photographing.

At this time, the object distance data Dx obtained by the AF circuit 16 is input to the AF data conversion circuit 17,
The focus drive data Dfx is obtained by adding the details of the zoom position data Zpx obtained by the zoom position detection circuit 19 described above (details will be described later).

In the next step S11, the drive of the focus motor 7 is started. Then, the next step S12
Then, it is determined whether or not Dfx-Pix = 0.
This determination determines whether or not the focus drive data Dfx and the step number data (cumulative data) Pix generated in the photo interrupter 18 are equalized each time the focus motor 7 is step-driven when the focus drive is actually performed. More specifically, it is more specifically determined whether or not the focus motor 7 is step-driven by the number of steps to be focus-driven.

The step drive of the focus motor 7 is continuously performed during NO in step S12. If YES, it is determined that the focus drive is completed, and the drive of the focus motor 7 is stopped in step S13. Done.

In the next step S14, the release switch 2
It is determined whether or not 1 is turned on. If NO, the process waits as it is, and if YES, the process proceeds to the next step S15, the shutter is opened, film exposure is started, and the shutter is closed in the next step S16. It is judged whether or not N
In the case of O, the process waits as it is, and in the case of YES, the film exposure is completed and the process proceeds to step S43 shown in FIG. 4, and the feeding motor 24 is driven through the feeding driving circuit 25 to wind the film. , Shutter charging, etc. are performed to prepare for the next film exposure.

When it is determined NO in step S7, that is, when the amount of camera shake is less than or equal to the predetermined value, the focus motor flag ^Mf is set to "1" in step S8. After being set, the first system consisting of steps S17 to S43 and the second system consisting of steps S44 to S48 shown in FIG. 3 are executed in parallel.

Explaining the first system, the offset data calculation in step S17 is performed by averaging the sampling data obtained by collecting the offset data in step S3 to obtain the offset data Boffset average. Find the value.

Then, the process proceeds to step S18, where k = 1, V
o = 0 (Here, k is the number of times of sampling made at 32, Vo is the data for the first time in the camera moving velocity data V ^k above) is set to.

Here, Vo = 0 means that the camera moving speed data V ^k immediately before starting a series of camera shake detections during camera shake correction is the same as the current state in the orientation of the camera and the handheld state. This is because it is meaningless even if this data is used as a reference because there is no guarantee that it is.

Then, in the next step S19, the respective data A ^k (1) to A ^k (32) at the 32 points are sampled, and in the next step S20 the blur change amount data B ^k is calculated by the following equation. Desired.

[0081]

[Equation 3] Further, in step S20, the camera moving speed data ^Vk is ^{obtained as Vk} = f ( ^Vk-1 , ^Bk , ^Bk-1 ), and this calculation is the first calculation forming the calculation means 10. Done in circuit 10a. For details, first,
This V ^k based on this B ^k is calculated, the current B ^k is stored in the first memory 11a serving as first storage means, like this V ^k is the second storage means It is stored in the second memory 11b.

Then, the current B ^k stored in the first memory 11a becomes the previous B ^k−1 when the next B ^k sent from the sampling circuit 6b is accepted by the first arithmetic circuit 10a. It is then input from the first memory 11a to the first arithmetic circuit 10a.

Regarding the current V ^k stored in the second memory 11b, the current V ^k is the first arithmetic circuit 1
Next B ^k sent from the sampling circuit 6b to 0a
Is accepted, it is set to V ^{k−1 of the} previous time and is input from the second memory 11b to the first arithmetic circuit 10a.
Therefore, the calculation of ^Vk = f ( ^Vk-1 , ^Bk , ^Bk-1 ) can be performed.

In the next step S21, it is determined whether the focus motor flag ^Mf is "0", that is, whether the focus motor 7 is stopped. If the focus motor 7 is being driven, the process branches to NO, and the process proceeds to step S23. The value is incremented like k = k + 1, the process returns to step S19, and steps S19, S20 and S21 are executed again.

When the focus motor 7 is stopped in step S21, the process branches to YES, and the ^{process proceeds} to the next step S22 to determine k = k ^mfs + C ² (k ^mfs : value of k at the end of AF). Done.

The reason for making this judgment is that the focus motor 7 is driven and a shock component due to motor stop exists in the output of the camera shake detection unit 6 immediately after the motor is stopped at the time of focusing. This is because accurate prediction driving cannot be performed when used for prediction calculation, and therefore C ² (for example, 5) more samplings than the value of k ( ^kmfs ) at the end of AF are waited.

Then, if YES in the step S22, the process proceeds to the next step S24, and the release switch 2
It is determined whether or not 1 is ON. If not, it is incremented in step S23 and steps S19 to S22 are executed again.

If YES at step S24, the process proceeds to step S25 and BLwide = f (V ^k , Dx).
Is calculated, and then BLzp = f (BL
wide, Zpx) is calculated and the next step S2
At 7, BLzp is converted to BL.

Next, the various calculations and conversions in steps S25 to S27 will be described in detail.

First, the relation between the blur correction data BLzp, which is the output of the calculation means 10 (the output of the third calculation circuit 10c), and the focal length of the photographing optical system, specifically, between the zoom position data Zpx. The relationship is that even with the same amount of camera shake, the longer the focal length, the larger the movement of the image position on the film surface.

Therefore, if the reference zoom position in the photographing optical system is on the WIDE (wide angle) side and the blur correction data at this time is the reference blur correction data BLwide,
The blur correction amount data BLzp is represented by BLzp = f (BLwide, Zpx).

When the zoom position data Zpx is not linearly related to the actual change in the focal length, BLzp = BLwide × f (Zpx) is used, where f (Zpx) = a ⁰ + a ¹ Zpx or f (Zpx) = a ⁰ + a ¹ Zpx + a ² Zpx ² may be used.

Here, a ⁰ , a ¹ , and a ² are predetermined constants.

Now, the above-mentioned reference blur correction data BLw
ide and between the camera moving velocity data ^{V k, BLwide = f (V} k As also shown in step S25,
Dx) is established, and the necessity of the subject distance data Dx in this case has already been described with reference to FIG. 6, but also in the case of converting the camera movement speed data V ^k into the reference blur correction data BLwide. Subject distance data Dx
Is required, and BLwide = f (V ^k , Dx) is required as shown in step S25 described above.

The object distance data Dx is the distance x
² is not linear with respect to the change (see FIG. 6), it is not preferable to use a complicated arithmetic circuit for performing a strict arithmetic operation. Therefore, in general, the zoom position data Zpx described above is used. Similar to the case of the correction by the approximate calculation in, BLwide = V ^k × f (Dx) where f (Dx) = b ⁰ + b ¹ Dx or f (Dx) = b ⁰ +
It suffices to perform an approximate operation in the form of b ¹ Dx + b ² Dx ² . In addition,
The symbols b ⁰ , b ¹ and b ² are predetermined constants.

On the other hand, the camera moving speed data V ^k has been described above as the moving speed of the image forming position on the film surface.
If this is used with the current moving speed, the response delay occurs as described above. This has already been described with reference to FIG. 16, but can be expressed by the following equation.

[0097]

[Equation 4] Alternatively, V ^k = f (V ^k-1 , B ^k ) = (V ^k-1 ) + B ^k .

Now, the calculating means 10 carries out the camera shake prediction correction on the basis of the current shake change amount data B ^k , the previous shake change amount data B ^k-1, and the previous camera moving speed data V ^k-1. Specifically, in the present embodiment, when the shake condition is substantially sinusoidal like the characteristic a shown in FIG. 7, the shake correction drive that follows the movement is indicated by reference sign b. Like

That is, as shown in an enlarged view in FIG. 8, from the speed of the point B ^{1 at} the current time point t and the speed of the point A ¹ at the time point t-It, which is the integration time It per time before the time point t, to the time point. Time point t +, which is an integration time It per time before t
The speed of the point C ² at It is predicted, in other words, the speed of the point C 1 ( ²⁾ at time t + It is obtained by linear approximation.

Although it is desirable that the points C ¹ and C ² are completely coincident with each other, in reality, since the change in the characteristic a is substantially sinusoidal and the prediction is obtained by linear approximation, a slight error component is generated. However, in the normal case, this amount is negligible and no particular problem occurs.

Then, the camera moving speed data V ^k at the predicted time point t + It is V ^k = f (V ^k−1 , B ^k , B ^k−1 ) and, from another viewpoint, V ^k = V ^{k− 1} + 2B ^k −B ^k−1 .

Therefore, when the shake correction amount data BLzp is obtained in step S26, this data BLzp is converted into the shake correction drive data BL in the next step S27.

Specifically, the actuator drive circuit 14
Done in. The shake correction drive data BL is obtained by calculating the shake change amount data B ^k obtained by the hand shake detector 6 a plurality of times, and based on this, a predetermined prediction time (in the present embodiment, after the integration interval It). It is obtained by predictive calculation of the shake correction amount at the time point), and is an amount corresponding to the amount of camera shake at the prediction time point. Therefore, in order to correct the camera shake at the prediction time, the camera shake correction amount data BLzp is converted into the camera shake correction drive data BL with the phase reversed so as to cancel the camera shake.

Therefore, in step S27, the blur correction amount data BLzp is converted into the blur correction drive data BL, the blur correction actuator 9 is driven in the next step S28, and the correction optical member 5 is orthogonal to the optical axis O. The camera shake prediction correction is performed by moving to.

Then, the shutter is opened in the next step S29, the sampling interval It is subtracted from the shutter time Ss in the next step S30, and the subtracted time Ss is 0 or less in the next step S31. Whether or not it is determined, and if NO, in order to perform sampling again, the number of sampling times k is determined in the next step S32.
Is incremented.

Then, from step S33 to step S3.
8 is the above-mentioned steps S19, S20, S25, S26,
The same operation as in S27 and S28 is performed, and after the shake actuator is driven in step S38, the process returns to step S30, and in step S30, the time Ss obtained by subtracting the sampling interval It from the shutter speed is obtained and the next step S30.
At 31, it is determined whether the time Ss is 0 or less,
If NO, steps S32 to S38 are performed again as described above.

These steps S32 to S3
8 is repeated according to the determination made in step S31.
<0? Is determined to be YES, in other words, while the shutter is open, the shake prediction correction is repeatedly performed based on the shake detection.

If YES in step S31, the process proceeds to step S39, and it is determined whether or not the shutter is closed. If NO, step S3 is performed again.
9 is executed to enter the standby state, and if YES, the process proceeds to the next step S40, and the blur correction actuator 9 is driven in the direction opposite to the blur correction direction and is driven to return to the initial position. In the next step S41, the operation of the actuator drive circuit 14 is stopped by the prohibition signal I sent from the CPU 15, and the blur correction actuator 9 is stopped.

Next, also in step S42, the sampling circuit 6b of the camera shake detection unit 6 stops its operation by the prohibition signal I sent from the CPU 15 in the same manner as in step S41 described above, and the process proceeds to the next step S43.
Film preparation such as film winding, shutter charging, etc. is performed in preparation for the next shooting, and the operation of the first system in the sequence of the camera shake prediction correction is completed.

On the other hand, the operation of the second system shifts to step S44 when the focus motor flag becomes "1" in the above step S8, and the photometry circuit 20 is controlled based on the instruction from the CPU 15 to perform photometry. The shutter speed and aperture value corresponding to the proper exposure value based on the measured value are obtained.

At the same time, the AF circuit 16 causes the CPU 1
The distance measurement is performed under the control of the command from 5, and the subject distance data Dx obtained at this time is converted into the focus drive data Dfx by the AF data conversion circuit 17,
In the next step S45, the focus is driven by this data Dfx.

Then, the process proceeds to step S46, where Dfx-
A determination is made as to whether Pix = 0. This determination is based on the focus drive amount data Dfx corresponding to the drive step number of the focus motor 7 when the focus drive is actually performed, and the step number data Pi generated in the photo interrupter 18 every time the focus motor 7 is step-driven.
It is determined whether or not the cumulative value of x is equal, and more specifically, it is determined whether or not the focus motor 7 is step-driven by the number of steps to be focus-driven.

Then, in the case of NO in step S46, the step drive of the focus motor 7 is continuously performed, and in the case of YES, it is determined that the focus drive is completed, and in the next step S47, the focus motor 7 is driven. The drive is stopped.

In the next step S48, the focus motor flag ^{Mf is set} to "0", that is, the motor is stopped, and the value of k at the end of AF, that is, ^kmfs is set to k. It is prepared for the system flow to be executed in parallel to perform blur correction, film exposure, and the like.

Therefore, in the first embodiment described so far, the camera shake detection is performed at a predetermined interval (sampling interval I).
The shake change amount data B ^k obtained this time
7 and FIG. 7 because the prediction calculation is performed based on three types of data, that is, the shake variation amount data B ^k−1 obtained last time and the camera movement speed data V ^k−1 obtained last time. Assuming that the shake vibration is substantially sinusoidal like the characteristic a shown in 8, the shake drive amount at the next time point t + It is obtained by linear approximation based on the data at the current (current) time point t and the previous time point t-It. Therefore, the shake correction can be performed at a position substantially equal to the shake vibration at the next time point t + It.

Therefore, the movement of the image on the film surface is such that the blur amount characteristic e is substantially equal to the substantially sinusoidal correction amount characteristic d as shown in FIG. As shown in f, only a very small amount of undercorrection remains. Since this correction shortage amount is extremely small, it does not cause a substantial adverse effect.

Further, since the blur correction drive is corrected on the basis of the zoom position data Zpx obtained by detecting the focal length, it is possible to perform high-precision blur correction at all focal length positions.

Further, since the blur correction drive is corrected based on the subject distance data Dx obtained by detecting the subject distance, it is necessary to perform the high precision blur correction between the subject distances from the closest distance to the infinity. You can

In the above embodiment, three types of data are used for the prediction calculation performed to cancel camera shake, that is, the shake change amount data B ^k obtained this time and the shake change amount data B obtained last time.
^k-1 and the previously obtained camera movement speed data V ^k-1
Since it is performed based on the above data, it is possible to perform camera shake correction with excellent followability, and it is possible to obtain a camera that is substantially satisfactory under general conditions.

By the way, in the case where it is necessary to carry out a higher and more excellent image stabilization, for example, in the case of more severe conditions such as the use of a telephoto lens having a relatively large focal length, the following explanation will be given. It may be configured as in the second embodiment.

That is, a second embodiment of the present invention will be described with reference to FIGS.

FIG. 10 shows the circuit structure of the second embodiment of the present invention. The parts different from the structure shown in FIG.
Only the calculation means 30 and the storage means 31 are provided, and in order to avoid redundant description, the same parts are allotted with the same reference numerals.

The basic structure of the arithmetic means 30 is as follows:
The third arithmetic circuits 30a, 30b, 30c are sequentially connected in series, and the storage means 31 includes first, second, and third storage circuits.
It has third memories 31a, 31b, 31c.

The above-mentioned first arithmetic circuit 30a uses V ^k = f (V ^k-1 , B ^k , B ^k-1 , B ^k-2 ) where V ^k : (current) camera moving speed data V ^k-1 : (previous) camera movement speed data B ^k : (current) blur variation data B ^k-1 : (previous) blur variation data B ^k-2 : (previously before) blur variation data The second arithmetic circuit 30b and the third arithmetic circuit 30c are the same as the second arithmetic circuit 10b and the third arithmetic circuit 10c (see FIG. 1) used in the above-described first embodiment. belongs to.

On the other hand, the output end of the sampling circuit 6b, that is, the output end of the camera shake detection unit 6 is connected to the input end of the above-mentioned first memory 31a, and the output end of this first memory 31a is 1 is connected to the input end of the arithmetic circuit 30a.

Further, the output terminal of the first memory 31a is
It is connected to the input end of the second memory 31b, and the output end of the second memory 31b is connected to the input end of the first arithmetic circuit 30a. The output end of the first arithmetic circuit 30a is connected to the input end of the third memory 31c, and the output end of the third memory 31c is connected to the first arithmetic circuit 30a.
Is connected to the input end of.

In the first embodiment shown in FIG. 1, in the storage means 11, the first memory 11a for storing the previous camera shake detection data (camera shake change amount data) ^Bk-1 is stored in the first memory. A second memory 11b which stores the previous blur correction data (camera moving speed data) Vk ^-1
In the second embodiment shown in FIG. 10, the first memory 31a for storing the previous camera shake detection data B ^k-1 and the second memory before are stored in the second embodiment shown in FIG. The second memory 31b that stores the camera shake detection data B ^k-2 is also referred to as a first storage unit, and the third memory 31c that stores the previous camera shake correction data V ^k-1 is the second memory 31c. Storage means.

Next, the camera shake correction operation in the camera with the camera shake correction function according to the second embodiment having the above-described structure will be described.

The flowcharts shown in FIGS. 11 and 12 show the operation of the present embodiment, and since there are many parts that are the same as the flowcharts (FIGS. 3 and 4) in the above-mentioned first embodiment, repeated explanation is avoided The description of the case where the same operation is performed will be omitted, and only the parts that perform different operations will be described.

Step P1 in FIGS. 11 and 12.
To Step P19 and Steps P44 to P48 are Step S1 in the above-described first embodiment.
~ S19, S44 ~ S48 is the same operation. Therefore, after the process up to step P19 is executed in the same manner as in the first embodiment, the process moves to step P20.

In this step P20, the blur change amount data B ^k and the camera moving speed data V ^k are sampled by the sampling circuit 6.
It is obtained by the following equation by b.

[0132]

[Equation 5] In addition, the camera moving speed data V ^k is the first arithmetic circuit 3
It is obtained by the following equation using 0a.

V ^k = f (V ^k−1 , B ^k , B ^k−1 , B ^k−2 ) This detail is calculated by calculating V ^{k of} this time based on B ^k of this time and calculating B ^{k of} this time. Is stored in the first memory 31a,
Similarly, the current V ^k is stored in the third memory 31c.
The current B ^k stored in the first memory 31a is
When the next B ^k sent from the sampling circuit 6 b is accepted by the first arithmetic circuit 30 a, the B
^k-1 and the first memory 31a to the second memory 31
At the same time as being input to b, it is input to the first arithmetic circuit 30a.

Further, the previous shake variation amount data ^Bk-1 stored in the second memory 31b is the first arithmetic circuit 30.
When accepting the next B ^k sent from the sampling circuit 6b to a, it is input from the second memory 31b is a B ^k-2 before last to the first arithmetic circuit 30a.

Further, the current camera moving speed data V ^k stored in the third memory 31c is the first arithmetic circuit 30.
When the next B ^k sent from the sampling circuit 6 b is received in a, it is set to the previous V ^k−1 and is input from the third memory 31 c to the first arithmetic circuit 30 a. Therefore, V ^k = f (V ^k-1 , B ^k , B ^k-1 , B ^k-2 )
Can be calculated.

Then, in the next step P21, it is determined whether the focus motor flag M ^f is "0", that is, whether the focus motor 7 is stopped. The operation of this step P21 and subsequent steps P33 is
This is the same as steps S21 to S33 (FIG. 4) in the first embodiment described above.

The step P34 to which the process shifts after the step P33 is executed is performed in the same manner as the above-mentioned step P20, and thereafter, from the step P35 to the step P38,
The process is performed in the same manner as steps P25 to P28 described above.

On the other hand, if "Ss <0?" Is YES in step S31, the process shifts to step P39, and it is determined whether or not the shutter is closed. If NO, step P39 is executed again. Is executed and put in the standby state, and YE
In the case of S, the process proceeds to the next step P40, the blur correction actuator 9 is driven in the direction opposite to the direction of the blur correction, and is driven so as to return to the initial position.
In response to the prohibition signal I sent from the CPU 15, the operation of the actuator drive circuit 14 is stopped and the blur correction actuator 9 is stopped.

Next, in step P42, C is performed in the same manner as in step S42 shown in FIG.
The sampling circuit 6b of the camera shake detection unit 6 stops operating due to the prohibition signal I sent from the PU 15, and the process proceeds to the next step P43, and film feeding such as film winding and shutter charging is performed in preparation for the next shooting. The operation of the first system in the sequence of camera shake prediction correction is completed.

On the other hand, the operation of the second system is performed from step S9 to step S1 in the above-mentioned first embodiment shown in FIG.
Similar to the steps up to 6, steps P9 to P16 are performed.

Therefore, in the second embodiment described so far, the camera shake detection is performed at a predetermined interval (sampling interval I).
Each time t), the shake change amount data B ^k obtained this time, the shake change amount data B ^k-1 obtained last time, and the shake change amount data B ^k-2 obtained last time and the shake change amount data B ^k-2 obtained last time were obtained. Since the prediction calculation is performed on the basis of the four types of data including the camera moving speed data V ^k−1 , when the camera shake state is substantially sinusoidal like the characteristic a shown in FIG. The blur correction drive that follows is indicated by the symbol b.

Then, the speed of the point C ² at the current time point t and the time point t-, which is before the time point t by the integration time It per time.
The speed of the point B ¹ at It and the time point t−2 2 It before.
The velocity of the A ¹ point at It is to be obtained by curve approximation from the velocity of the A ¹ point at It, and the velocity at the D ³ point at the time point t + It, which is an It ahead of the time point t.

That is, the time t-2It and the time t-It are 2
If the difference between the speed C ¹ at time t and the actual speed (speed at point C ² ) obtained from each data at time t is Δ, this Δ is Δ = B ^k−1 −B ^k . ..

Therefore, the point D1 obtained from the points B ¹ and C ²
The data at the point D2, which is obtained by subtracting Δ from the data at time t2, is predicted to be the velocity at time t + It, which is a point after time t1 and It. When this is the formula ^{V k = f (V k-} 1, B k, B k-1, B k-2) , and the another point of ^{view, V k = V k-1} + 3B k -3B k- ¹ + B ^k−2 .

That is, the camera movement speed V ^k-1 for blur correction at the previous time (time t-It) and the amount of change in blur (integration) at each of the previous time (time t-It) and the last time before (time t-2It). As a result, B ^k-1 and B ^k-2 are temporarily stored in the first and second memories 31a and 31b,
This stored data and the shake change amount data B at this time (time t)
^{Using k} and ^k , camera movement speed data V ^k is calculated, and based on this data V ^k , shake variation amount data B ^k at time t + It is calculated, and prediction using so-called curve approximation is performed.

Therefore, in the second embodiment, it is possible to perform the shake correction with higher speed and higher accuracy than in the first embodiment described above, and therefore, it is possible to achieve a telephoto with a handheld lens which has been impossible in the past. Shooting becomes possible.

The present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the spirit of the invention.

For example, as the correction optical member, not only the above-mentioned example but also a wedge-shaped prism may be arranged orthogonally to the optical axis and moved vertically when blurring correction is performed.

Further, in the above-mentioned embodiment, the data in each of a plurality of times is used as the data necessary for performing the prediction calculation. The number of times may be two, the number of data before two, the data of the previous time, and the data of this time may be three as in the second embodiment, or more times.
The selection of the number of times can be arbitrarily determined according to the size of the measurement interval, the size of the required camera shake correction accuracy, the manufacturing cost, and the like.

Further, as a concrete example of the camera shake detecting section used in the camera according to the present invention, as shown in the above first and second embodiments, the camera shake sensor 6a comprising a semiconductor type acceleration sensor. The sampling circuit 6b and the sampling circuit 6b detect the acceleration generated in the camera body and integrate it in a predetermined period, and may be a gyro-type accelerometer or the like. In short, data corresponding to camera shake generated in the camera body. May be obtained as an electric signal.

Further, the camera according to the present invention can be applied not only to the case where the taking lens is the zoom lens but also to the single-focus type camera as described above in the first and second embodiments. Of course.

Further, in the camera according to the present invention, the correction in the current zoom position data Zpx is based on the case where the focal length of the photographing optical system is the widest angle side as described in the first and second embodiments. However, the present invention is not limited to this example, and the reference focal length may be set on the telephoto side or between the wide angle and the telephoto.

The zoom position detecting means is the above-mentioned first
Further, as described in the second embodiment, the zoom position data is obtained by detecting the movement of the zoom lens group, but the zoom position may be obtained by detecting the movement of the correction optical member.

As a concrete example of the variable focal length photographing optical system, not only the zoom lens as shown in the first and second embodiments but also a varifocal lens or a continuous focal length change is used. Alternatively, it may be a bifocal lens or the like that changes stepwise.

The correction optical member may be a part or all of the focus lens group and the zoom lens group, and it is not necessary that the focus lens group and the zoom lens group exist independently.

Further, it is left to the design freedom to correct the shake correction amount according to the size of the subject distance, and similarly, it is also left to the design freedom to correct the shake correction amount according to the size of the focal length. It is something.

Further, in the above-mentioned first and second embodiments, the object distance data is continuously obtained from the close-up to infinity of the object distance. It may be obtained in stages.

[0158]

As is apparent from the above description, according to the present invention, when the correction optical member inserted in the optical path of the photographing optical system is driven in the direction for correcting the blur, the correction optical member is moved at a predetermined time interval. Prediction calculation is performed on the basis of the camera movement speed data and the shake variation amount data at a plurality of time points, and the shake correction data at the time of driving the correction optical member is obtained, and the shake correction is performed corresponding to this data. Since the camera shake is performed, it is possible to perform the correction that effectively cancels the camera shake regardless of the size of the camera shake of the camera operator and even when the camera shake continuously occurs.

In particular, according to the inventions of claims 4 and 5, the current focal length in the photographing optical system is detected, and the blur correction data is corrected by the zoom position data obtained at this time. It is possible to perform correction with high accuracy over the entire focal length.

Furthermore, according to the sixth and seventh aspects, since the blur correction data is corrected by the subject distance data obtained by detecting the distance of the subject, the blur correction data between the closest distance and the infinity distance is corrected. It is possible to perform blur correction with high accuracy over the entire area. As described above, in any of the inventions, as a result, it is possible to provide a camera capable of taking a good picture without blurring.

[Brief description of drawings]

FIG. 1 is a block diagram showing a circuit configuration in a first embodiment of the present invention.

FIG. 2 is a principle diagram for explaining an operation of an AF circuit included in the embodiment of FIG.

FIG. 3 is a flowchart for explaining the operation of the first embodiment.

FIG. 4 is a flowchart for explaining the operation of the first embodiment.

FIG. 5 is a waveform diagram for explaining a sampling operation in the first embodiment.

FIG. 6 is an optical path diagram for explaining a relationship between camera shake and a change in an image formation point of a subject at an arbitrary subject distance.

FIG. 7 is a waveform diagram showing a state of camera shake correction in the first embodiment.

FIG. 8 is a partially enlarged view of FIG. 7.

FIG. 9 is a waveform diagram showing the amount of camera shake after camera shake correction in the first embodiment.

FIG. 10 is a block diagram showing a circuit configuration according to a second embodiment of the present invention.

FIG. 11 is a flowchart for explaining the operation of the second embodiment.

FIG. 12 is a flow chart for explaining the operation of the second embodiment.

FIG. 13 is a waveform diagram showing an operation state of camera shake correction in the second embodiment.

FIG. 14 is an optical path diagram conceptually showing the operation of a conventional camera with an image stabilization function.

FIG. 15 is an optical path diagram conceptually shown together with a lens movement locus diagram for explaining the operation of the conventional camera with a camera shake correction function.

FIG. 16 is a waveform diagram showing a correction operation of a conventional camera with a camera shake correction function.

FIG. 17 is a partially enlarged view of FIG.

FIG. 18 is a waveform diagram showing a temporal change in the amount of camera shake after camera shake correction in a conventional camera with a camera shake correction function.

[Explanation of symbols]

1 Shooting Optical System 2 Film Surface 3 Focus Lens Group 4 Zoom Lens Group 5 Correction Optical Member 6 Hand Shake Detection Section 6a Shake Sensor 6b Sampling Circuit 7 Focus Motor 8 Zoom Motor 9 Shake Correction Actuator 10,30 Computational Means 10a, 30a 1st Arithmetic circuit 10b, 30b Second arithmetic circuit 10c, 30c Third arithmetic circuit 11,31 Storage means 11a, 31a First memory 11b, 31b Second memory 31c Third memory 12 Focus drive circuit 13 Zoom drive Circuit 14 Actuator drive circuit 15 CPU 16 AF circuit 17 AF data conversion circuit 18 Photointerrupter 19 Zoom position detection circuit 20 Photometry circuit 21 Release switch 22 Photometry switch 23 Zoom switch 24 Feed motor 25 Feed drive circuit 2 Memory O optical axis P camera Q principal point R imaging optical system L ¹ projection lens L ² receiving lens OJ object LED light emitting diodes PSD position sensor

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Toru Nishida 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd.

Claims (7)

[Claims] 1. A correction optical member inserted in an optical path of a photographing optical system for correcting movement of an image position on a film surface caused by camera shake of a camera body, and the correction optical member is required. A camera shake correction actuator that moves or tilts in the direction, a camera shake detection unit that obtains camera shake detection data by converting the camera shake of the camera body into an electrical signal, and a first unit that temporarily stores the camera shake detection data from the camera shake detection unit. And a calculating means for calculating shake correction data for correcting the movement of the image position on the film surface due to camera shake of the camera body by driving the correction optical member by the shake correction actuator, and A second storage means for temporarily storing the output data of the calculation means, and the camera shake detection of this time obtained by the shake detection section by the calculation means. Based on the data, the previous camera shake detection data stored in the first storage means, and the previous camera shake correction data stored in the second storage means, the image position on the film surface due to the camera body shake is determined. A camera with a camera shake correction function, characterized in that the camera is configured to calculate camera shake correction data for predicting correction by driving the correction optical member by the camera shake correction actuator. 2. A correction optical member inserted in an optical path of a photographing optical system for correcting movement of an image position on a film surface caused by camera shake of a camera body, and the correction optical member is required. A camera shake correction actuator that moves or tilts in the direction, a camera shake detection unit that obtains camera shake detection data by converting the camera shake of the camera body into an electrical signal, and a first unit that temporarily stores the camera shake detection data from the camera shake detection unit. And a calculating means for calculating shake correction data for correcting the movement of the image position on the film surface due to camera shake of the camera body by driving the correction optical member by the shake correction actuator, and A second storage means for temporarily storing output data from the calculation means, and the current shake obtained by the shake detection section by the calculation means. On the film surface due to camera shake based on the camera shake detection data, the camera shake detection data of the previous time and the previous time before stored in the first storage means, and the previous camera shake correction data stored in the second storage means. A camera with a camera shake correction function, characterized in that the camera is configured to calculate camera shake correction data for the next prediction of the movement of an image position by driving the correction optical member by the camera shake correction actuator next time. 3. The camera shake detection unit according to claim 1 or 2, wherein the camera shake detection unit is configured to detect the acceleration generated in the camera body and integrate it for a predetermined period to generate camera shake detection data. Camera with correction function. 4. A correction optical member inserted in the optical path of a variable focal length photographing optical system for correcting movement of an image position on a film surface caused by camera shake of a camera body, and the correction optical member. The camera shake correction actuator that moves or tilts the camera in the required direction, the camera shake detection unit that converts the camera shake of the camera body into an electrical signal to obtain camera shake detection data, and the camera shake detection data from this camera shake detection unit is temporarily stored. First storage means, zoom position detection means for detecting the focal length in the photographing optical system to obtain zoom position data, and movement of the image position on the film surface due to camera shake of the camera body. A calculation means for calculating shake correction data for driving and correcting the member by the shake correction actuator, and output data of the calculation means are temporarily stored. And a second storage means for storing the current camera shake detection data obtained by the camera shake detection section by the calculation means, the previous camera shake detection data stored in the first storage means, and the second storage means. In order to predict the movement of the image position on the film surface due to the camera shake on the film surface based on the previous shake correction data stored in the storage means, by driving the correction optical member by the shake correction actuator. A camera with a camera shake correction function, characterized in that the camera shake correction data is calculated and the focal length correction is performed on the camera shake correction data based on the zoom position data obtained by the zoom position detecting means. 5. A correcting optical member inserted in the optical path of a variable focal length photographing optical system for correcting movement of an image position on a film surface caused by camera shake of a camera body, and the correcting optical member. The camera shake correction actuator that moves or tilts the camera in the required direction, the camera shake detection unit that converts the camera shake of the camera body into an electrical signal to obtain camera shake detection data, and the camera shake detection data from this camera shake detection unit is temporarily stored. First storage means, zoom position detection means for detecting the focal length in the photographing optical system to obtain zoom position data, and movement of the image position on the film surface due to camera shake of the camera body. A calculation means for calculating the shake correction data for driving the member by the shake correction actuator to correct it, and the output data from the calculation means are temporarily stored. Second storage means for storing the same, and the present camera shake detection data obtained by the camera shake detection section by the arithmetic means and the previous and two before camera shake detection data stored in the first storage means. And the movement of the image position on the film surface due to the shake of the camera body based on the previous shake correction data stored in the second storage means, the correction optical member is driven next time by the shake correction actuator. A camera with a camera shake correction function, characterized in that the camera shake correction data for correction prediction is calculated and the focal length correction is performed on the camera shake correction data based on the zoom position data obtained by the zoom position detecting means. .. 6. A correction optical member inserted in the optical path of a photographing optical system for correcting movement of an image position on a film surface caused by camera shake of a camera body, and the correction optical member is required. A camera shake correction actuator that moves or tilts in the direction, a camera shake detection unit that obtains camera shake detection data by converting the camera shake of the camera body into an electrical signal, and a first unit that temporarily stores the camera shake detection data from the camera shake detection unit. The storage means, the distance measuring means for measuring the distance to the subject to obtain the subject distance data, and the movement of the image position on the film surface due to camera shake of the camera body, the correction optical member by the shake correction actuator. Comprising: a calculation means for calculating shake correction data for driving and correcting; and a second storage means for temporarily storing output data of this calculation means, The current camera shake detection data obtained by the camera shake detection section, the previous camera shake detection data stored in the first storage means, and the previous camera shake correction data stored in the second storage means by the calculation means. Based on the above, the blur correction data for driving and predicting the movement of the image position on the film surface due to the blur of the camera body by driving the correction optical member by the blur correction actuator is calculated and the distance measuring means is used by the distance measuring means. A camera with a camera shake correction function, which is configured to perform a correction calculation according to the obtained object distance data. 7. A correction optical member inserted in the optical path of a photographing optical system for correcting movement of an image position on a film surface caused by camera shake of a camera body, and the correction optical member is required. A camera shake correction actuator that moves or tilts in the direction, a camera shake detection unit that converts camera shake of the camera body into an electric signal to obtain camera shake detection data, and a first unit that temporarily stores the camera shake detection data from the camera shake detection unit. The storage means, the distance measuring means for measuring the distance to the subject to obtain the subject distance data, and the movement of the image position on the film surface due to camera shake of the camera body, the correction optical member by the shake correction actuator. Comprising a calculation means for calculating the shake correction data for driving and correcting, and a second storage means for temporarily storing the output data from this calculation means. The camera shake detection data of this time obtained by the camera shake detection unit, the previous time stored in the first storage means, the camera shake detection data of the last time before and the previous time stored in the second storage means, Based on the shake correction data, the shake correction data for calculating and predicting the movement of the image position on the film surface due to the shake of the camera body by driving the correction optical member next time with the shake correction actuator is calculated. A camera with a camera shake correction function, which is configured to perform a correction calculation according to subject distance data obtained by the distance measuring means.