JPH04335331A - Camera with image stabilization function - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a camera with an image stabilization function, and more specifically, the present invention relates to a camera with an image stabilization function. The present invention relates to a camera with an image stabilization function that drives a correction optical member to cancel image movement on a film surface.

0002

2. Description of the Related Art In general, a camera with an image stabilization function (hereinafter referred to as a "camera") is integrated into the camera body as shown in FIG. Alternatively, a photographing optical system 1 is provided detachably via a lens mount, and a film surface 2 is located behind the optical axis O thereof.

This photographic 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 the optical path. is inserted.

The focus lens group 3 is driven to 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 a zoom command signal Dz.
Zooming is performed, and the compensation optical member 5 is driven to compensate for camera shake using the camera shake compensation command signal Da.

Next, a specific form of the camera shake correction command signal Da will be explained. If the vibration caused by camera shake occurring in the camera body has a substantially sinusoidal characteristic a whose amplitude moves in the ± direction with the border of 0 as shown in Figure 16, in order to correct the camera shake, first The camera shake detection section detects the speed V in a very short period, calculates and obtains the shake change amount data Bk based on the detected data at this time, and uses the shake correction command signal Da based on this shake change amount data Bk.
The image movement on the film surface 2 is eliminated by driving the correction optical member 5 in a direction that cancels movement caused by camera shake.

However, the movement after correction always lags behind as indicated by the symbol b. That is, as shown in an enlarged view in FIG.
The camera movement speed data Vk, Vk-1 is obtained from the camera shake change data Bk, Bk-1 based on the shake detection values obtained for each time (integration time). Find this data Vk
, Vk-1, the camera shake correction command signal Da is generated.

Therefore, as shown in FIG. 18, the movement of the image on the film surface is a post-correction characteristic f when correction is made using the correction amount characteristic d for the blur amount characteristic e.

[0008] For this reason, as for camera shake correction, the effect of improving the amount of shake of the camera body is only about 1/4.

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

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

[0011] Further, as another means for converging camera shake vibration using electric means, that is, means for changing the amplification factor of the drive circuit as described above, as disclosed in the same publication, Some devices improve camera shake correction by changing the rigidity of a vibration sensor for detecting camera shake so as to converge camera shake vibrations.

Incidentally, conventionally, an actuator such as a stepping motor is used to drive a correction optical member based on various data obtained by detecting camera shake occurring in the camera body. In this case, as a matter of course, since the correction optical member and the actuator are built into the camera body, the movement range of the correction optical member or the actuator is limited, and the range of movement of the correction optical member or the actuator is limited. It will be moved within the range. For this reason,
If the camera shake occurring in the camera body is very large, the movement of the correcting optical member to cancel out the camera shake will be large enough to exceed a predetermined movement range. As a result, there is a problem in that the correction optical member or actuator collides with the stopper member for regulating the movement range, which may significantly impair the image stabilization function or, in extreme cases, damage the image stabilization mechanism.

[0013] This problem occurs when the camera body shake is extremely large. The reason for this is that extremely large camera shake is detected when the camera is not held in a stable state, that is, when the photographer pans while observing the subject image in the viewfinder and searches for a position that meets the shooting intent. This is because blur correction driving is performed based on the detection.

It should be noted that such problems often occur during panning, and for example, Japanese Patent Laid-Open No. 61-2
As shown in Japanese Patent No. 40779, when the start of panning is detected, the detection gain of the camera shake detection unit is increased in order to suppress the movement of the actuator for driving the correction optical member. The gain for the drive signal is reduced.

On the other hand, in a steady state in which the amount of camera shake is not so large, that is, when the end of panning is detected, the camera shake detector is activated to normalize the movement of the actuator for driving the correction optical member. In other words, the gain for the actuator drive signal is increased to a normal value.

Therefore, by suppressing the movement of the actuator during panning when large camera shake occurs, and by allowing the actuator to move normally during steady state, the correction optical member and the actuator will collide with the inner wall of the camera body and the stopper member. It is possible to prevent this.

[0017]

[Problem to be Solved by the Invention] In conventional cameras, camera shake is detected, the amount of drive of a correction optical member is calculated based on the detection result, and the correction optical member is driven based on the result of this calculation. As a result, the following problems occur.

That is, since a time delay (see reference numeral c in FIG. 16) inevitably occurs between the time when camera shake is detected, the time when calculation is completed, and the time when driving is performed, although camera shake is improved to a certain extent, The drawback is that there is always an under-compensation amount due to the delay that occurs in the image stabilization system.

Even with such a conventional system, if the absolute amount of camera shake occurring in the camera is relatively small, the amount of under-compensation will also be small, causing substantial problems with the compensation means in the conventional device. Although this is not the case, if the absolute amount of camera shake is large, a large amount of undercorrection will always occur.

Collisions of the correction optical member or actuator occur not only due to large camera shakes during panning, but also due to various operations of the shutter speed setting button, aperture ring, zoom ring, etc. provided on the camera body. Collisions can also occur when a photographer operates a member, but in conventional devices, no countermeasures have been taken to prevent collisions, and collision prevention is currently performed only during panning.

The present invention has been made to solve the above-mentioned problems, and its purpose is to effectively reduce the amount of camera shake not only when the absolute amount of camera shake is small but also when it is large. A camera that properly compensates for images that does not cause blurring, and that does not cause the optical component or actuator for compensation to be driven greatly and collide with other components due to transient extremely large camera shake. It is about providing.

[0022]

[Means for Solving the Problems] In order to achieve the above object, the invention of claim 1 provides an optical path of a photographing optical system to correct the movement of the image position on the film surface caused by camera shake of the camera body. A correction optical member inserted therein, a shake correction actuator that moves or tilts the correction optical member in a required direction, and a camera shake detection unit that converts the camera shake of the camera body into an electrical signal to obtain camera shake detection data. a position detection means for detecting the position of the correction optical member or the position of the blur correction actuator and outputting position data; and detecting a focal length of the photographing optical system at the time of photographing and outputting focal length data. a focal length detecting means for outputting lens extension amount data or subject distance data when the photographing optical system is in focus during photographing; and a subject distance detecting means for outputting lens extension amount data or subject distance data when the photographic optical system is in focus during photographing, and a camera shake detection data obtained by the camera shake detecting section and the focal point. Based on the focal length data obtained by the distance detecting means and the subject distance data obtained by the subject distance means, the movement of the image position on the film plane due to camera shake of the camera body is corrected by driving the blur correction actuator. a calculation means for calculating blur correction data for the calculation, and a calculation means for calculating the blur correction data obtained by the calculation means to generate correction data for weighting the amount of movement based on the position data obtained by the position detection means. The present invention is characterized by comprising a correction calculation means.

The invention according to claim 2 also provides a correction optical member inserted into the optical path of the photographing optical system to correct the movement of the image position on the film surface caused by camera shake of the camera body; an image stabilization actuator that moves or tilts the optical member for correction in a required direction; an image stabilization actuator that converts the camera shake of the camera body into an electrical signal to obtain image stabilization data; a position detection means for detecting the position of the actuator and outputting position data; a focal length detection means for detecting the focal length of the photographing optical system during photographing and outputting focal length data; and the photographing optical system during photographing. a subject distance detection means for outputting lens extension amount data or subject distance data when in focus; camera shake detection data obtained by the camera shake detection section; focal length data obtained by the focal length detection means; and the subject distance. a calculation means for calculating blur correction data for driving the blur correction actuator to correct the movement of the image position on the film plane due to hand shake of the camera body, based on the object distance data obtained by the means; A determination means for outputting a shake correction stop signal when the amount of camera shake corresponding to camera shake detection data obtained by the camera shake detection section becomes larger than a predetermined setting value, and when the shake correction stop signal is input from the determination means. and a control means for controlling at least the blur correction drive by the correction optical member to be stopped.

Furthermore, the invention of claim 3 provides a correction optical member inserted into the optical path of the photographing optical system to correct the movement of the image position on the film surface caused by camera shake of the camera body; a shake correction actuator that moves or tilts the correction optical member in a required direction; a shake detection section that converts the camera shake of the camera body into an electrical signal to obtain shake detection data; and a position of the correction optical member or the shake. a position detecting means for detecting the position of the correction actuator and outputting position data; a focal length detecting means for detecting the focal length of the photographing optical system at the time of photographing and outputting focal length data; and the photographing optical system at the time of photographing. an object distance detection means for outputting lens extension amount data or object distance data when the system is in focus; camera shake detection data obtained by the camera shake detection section; focal length data obtained by the focal length detection means; and the object. a calculation means for calculating blur correction data for driving the blur correction actuator to correct movement of the image position on the film plane due to camera shake caused by camera body shake, based on the object distance data obtained by the distance means; a correction calculation means for generating correction data for weighting the blurring correction data obtained by the calculation means to the amount of movement based on the position data obtained by the position detection means; and a correction optical system using the position detection means. A warning means for giving a warning when the position corresponding to the position data obtained during the correction drive of the member is near the movement limit end of the correction optical member or the blur correction actuator. It is.

[0025]

[Operation] A camera with an image stabilization function configured as described above uses a correction device inserted in the optical path of the photographic optical system to correct the movement of the image position on the film surface caused by camera shake in the camera body. The optical member is moved or tilted in a direction specified by a blur correction actuator.

[0026] The camera shake occurring in the camera body is converted into electrical signals at multiple points in time using the camera shake detection section. The calculating means calculates shake correction data based on the plurality of camera shake detection data obtained in this way. When performing image stabilization by driving the image stabilization actuator according to the output data of the calculation means, the position of the optical correction member or the position of the image stabilization actuator is detected using a position detection means,
The amount of movement is weighted based on the obtained position data to correct the above-mentioned blur correction drive.

Further, according to the second aspect of the invention, when the amount of camera shake corresponding to the camera shake detection data obtained by the camera shake detector becomes larger than a predetermined set value, the camera shake correction drive is stopped.

Furthermore, the invention according to claim 3 issues a warning when the drive position of the correction optical member or the blur correction actuator corresponding to the position data obtained by the position detection means is within its drive limit range.

[0029]

Embodiments Hereinafter, embodiments of the present invention will be explained in detail with reference to FIGS. 1 to 14. In FIG. 1 showing the circuit configuration of the first embodiment of the present invention, the light of the photographing optical system 1 is integrated into the camera body as seen in a compact camera, or is provided detachably via a lens mount or the like. A film surface 2 is located on the axis O.

This photographing optical system 1 includes a focus lens group 3 formed by a plurality of lenses, a zoom lens group 4 formed by a plurality of lenses, and these two lens groups 3.
, 4 and a correction optical member 5 for correcting the optical axes of the lenses according to camera shake.

[0031] Further, a camera shake detection section 6 is provided in the camera body. This camera shake detection section 6 includes a camera shake sensor 6a.
The shake sensor 6a can be a semiconductor type acceleration sensor, for example, and the sampling circuit 6b is formed of a sampling circuit 6b that samples the output of the vibration sensor.
Sampling is performed at predetermined intervals.

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

The output end of the shake sensor 6a is connected to the input end of a sampling circuit 6b, and the output end of the sampling circuit 6b, that is, the output end of the camera shake detection section 6, is connected to the input end of the calculation means 10. , storage means 11 is connected to this calculation means 10.

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

The actuator drive circuit 14 is formed by connecting a correction circuit 14a and a drive circuit 14b in series.

Furthermore, a CPU 15 is provided which issues commands to control various parts provided within the camera body in a complex manner, and this CPU 15 includes an AF circuit 16 for distance measurement and automatic focusing. It is connected.

The output end of the AF circuit 16, ie, the sending end of the object distance data Dx, is connected to the AF data conversion circuit 1.
7, this AF data conversion circuit 1
The output end of 7, that is, the sending end of the focus drive data Dfx is connected to the first control end of the focus drive circuit 12.

The second control end of the focus drive circuit 12 is connected to the output end of a photointerrupter 18 that generates pulse number data Pix in accordance with the rotation of the focus motor 7.

On the other hand, the photographing optical system 1 is provided with a zoom position detection circuit 19 for obtaining current focal length position data of the zoom lens group 4.
The output end of , that is, the sending end of the zoom position data Zpx is A
It is connected to the second control end of the F data conversion circuit 17 and also to the first control end of the zoom drive circuit 13 described above. The second control end of this zoom drive circuit 13 includes a CP
The output end of U15, that is, the sending end of zoom drive amount data Z' is connected.

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

Furthermore, a feeding motor 24 is provided for performing a series of operations such as film winding and shutter charging, and this feeding motor 24 is operated via a feeding drive circuit 25 connected to the output end of the CPU 15. The rotation is controlled according to a feeding command from the CPU 15.

Also connected is a memory 26 for temporarily storing fixed data for causing the CPU 15 to execute a predetermined program and data necessary for performing various controls.

Furthermore, the above-mentioned blur correction actuator 9
An actuator position detection circuit 27 that detects the position of and generates position data G1 is connected to the CPU 15.

This actuator position detection circuit 27 is as follows:
This is a specific example of a position detection means that detects the position of the correction optical member 5 or the position of the blur correction actuator 9 to generate position data G1.

Further, correction data G2 is generated for correcting the blur correction data (details will be described later) obtained by the above-mentioned calculation means 10 at a predetermined timing based on the position data G1 obtained by the actuator position detection circuit 27. A gain correction calculation circuit 28, which is a specific example of a correction calculation means for performing the correction calculation, is provided.

Furthermore, the CPU 15 is provided with a warning that warns when the position corresponding to the position data G1 obtained by the actuator position detection circuit 27 is near the movement limit end of the optical correction member 5 or the blur correction actuator 9. A display 29, which is a specific example of means, is connected.

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

The first arithmetic circuit 10a described above has Vk=f
(Vk-1, Bk, Bk-1) However, Vk: (current) camera movement speed data Vk-1: (previous) camera movement speed data Bk: (current) blur change amount data Bk-1: ( This is to obtain the data on the amount of change in blur (previous time).

The second arithmetic circuit 10b uses the current camera movement speed data Vk and A obtained by the first arithmetic circuit 10a.
From the subject distance data Dx output from the F circuit 16, blur correction reference drive data BLwide, that is, BLw
ide=f(Vk, Dx), and the third arithmetic circuit 10c uses the blur correction reference drive data BLwi obtained by the second arithmetic circuit 10b.
From de and the zoom position data Zpx obtained by the zoom position detection circuit 19, blur correction amount data BLzp, that is,
This is to obtain BLzp=f(BLwide, Zpx).

On the other hand, the input terminal of the first memory 11a described above is connected to the output terminal of the sampling circuit 6b, that is, the output terminal of the camera shake detection section 6, and the output terminal of the first memory 11a is connected to the output terminal of the first calculation circuit 6b. It is connected to the first input terminal of the circuit 10a. The input terminal of the second memory 11b is connected to the first arithmetic circuit 1.
The output terminal of the second memory 11b is connected to the second input terminal of the first arithmetic circuit 10a.

Next, a description will be given of the image stabilization operation in the camera with an image stabilization function according to this embodiment configured as described above.

In step S1 of the flowchart shown in FIG. 2, when the main switch is turned on, power is supplied to each part of the circuit, and each part of the circuit is initialized to execute a predetermined program stored in the memory 26. A control signal is sent from the CPU 15 to the camera shake detector 6, the camera shake sensor 6a and the sampling circuit 6b are activated, a sampling operation for camera shake detection is started, and it is determined in the next step S2 whether or not sampling has started. , if NO, the process waits until sampling starts.

Here, the shake change amount data Bk obtained as the output of the camera shake detector 6 is given in dimensions as velocity data obtained by integrating the output Ak of the shake sensor 6a over a fixed period It at sampling intervals St.

A schematic diagram of this situation is shown in FIG. 3, in which the output Ak of the shake sensor 6a is
By performing sampling n times, for example, 32 times, at a minute sampling interval St from , and integrating for a certain period It, blur change amount data as shown in the following equation is obtained.

[0055]

[Equation 1] When it is determined that the sampling performed in this way has started, step S2 branches to YES,
The process moves to the next step S3. This step S3 is for collecting offset data.

Here, the purpose of obtaining the offset data is that the blur change amount data Bk corresponding to the camera shake occurring in the camera body is obtained as the difference with respect to the output Ak of the blur sensor 6a when the acceleration is 0. Therefore, multiple outputs B1, B2...
From Bk, offset data Bo is obtained as shown in the formula below.
This is because it is necessary to subtract ffset.

[0057]

[Equation 2] After the offset data is obtained in this way, the process moves to the next step S4, where it is determined whether the release button is pressed halfway or not. If NO, the process returns to step S3 and YES is selected. In this case, the process moves to the next step S5 and the zoom position data Zpx obtained by the zoom position detection circuit 19 is
is stored in the photometry circuit 2 based on a command from the CPU 15.
0 is activated, and photometry and exposure calculations are performed.

[0058] Continuing to the next step S6,
Data BoL(t) for checking the magnitude of blur
is obtained from the check data Bok and the zoom position data Zpx as BoL(t)=f(Bok, Zpx).

Then, the process moves to the next step S7, where it is determined whether the above-mentioned data BoL(t) is greater than or equal to the value of the predetermined reference data C1.If NO, the process moves to the next step S8. 4, and the flag indicating that the focus motor 7 is rotating, that is, the Mf flag, is set to "1".
Step S17 and step S4 of the flowchart shown in
8 in parallel.

On the other hand, if YES in step S7,
Since the amount of camera shake in the camera body is so large that it cannot be corrected, we judge that the photographer is intentionally moving the camera body, for example to take a panning shot of a fast-moving subject, and do not perform image stabilization. , the process moves to step S9.

In step S9, the CPU 15 sends an inhibition signal I to the sampling circuit 6b of the camera shake detection section 6 to stop sampling.

[0062] Furthermore, the above-mentioned step S7 and step S9
The details of the function are as follows: When the amount of camera shake corresponding to the camera shake detection data obtained by the camera shake detector 6, that is, the amount of camera shake change data Bk, that is, the data BoL(t) for checking, is set to a predetermined setting value, that is, the reference data C1. Step S7 is a determining means that generates a blur correction stop signal (inhibition signal I) when the blur correction becomes larger. Further, step S9 is an example of a control means that controls to stop at least the blur correction drive by the correction optical member 5 when the prohibition signal I is obtained by the judgment means.

Then, the process moves to the next step S10, and photometry and distance measurement for photographing are performed. At this time, the subject distance data Dx obtained by the AF circuit 16 is input to the AF data conversion circuit 17, which takes into account the contents of the zoom position data Zpx obtained by the zoom position detection circuit 19 (details will be described later). , focus drive data Dfx are obtained.

In the next step S11, the focus motor 7 starts to be driven. Then, the next step S1
At step 2, it is determined whether Dfx-Pix=0. This judgment is made based on the focus motor drive data Dfx and the focus motor 7 when actually driving the focus.
It is determined whether or not the step number data (cumulative data) Pix generated in the photo interrupter 18 each time the focus motor 7 is driven step by step is equal to the step number data (accumulated data) Pix. This is to determine whether or not the motor is driven.

[0065] While NO in step S12, the step drive of the focus motor 7 is continued; in the case of YES, it is determined that the focus drive has been completed, and the drive of the focus motor 7 is stopped in step S13. It will be done.

In the next step S14, the release switch 2
It is determined whether or not 1 is turned on. If NO, it remains on standby; if YES, the process moves 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 determined whether or not
In the case of O, the standby continues, and in the case of YES, the film exposure is completed and the process moves to step S47 shown in FIG. 4, where the feed motor 24 is driven via the feed drive circuit 25 and the film is wound. , shutter charge, etc. are performed in preparation for the next film exposure.

Now, when it is determined NO in the above-mentioned step S7, that is, when it is determined that the amount of camera shake is less than a predetermined value, the focus motor flag Mf is set to "1" in the next step S8. Next, a first system consisting of steps S17 to S47 and a second system consisting of steps S48 to S52 shown in FIG. 4 are executed in parallel.

First, to explain the first system, the offset data calculation performed in step S17 averages the sampling data obtained by collecting the offset data performed in step S3 described above, and calculates the offset data Boffset average value. We seek.

Next, the process moves to step S18, where k=1, Vo=0 (k is the number of samplings of 32 pieces, Vo=0).
is the first data in the above camera movement speed data Vk).

The reason why Vo=0 is set here is that the camera movement speed data Vk immediately before starting a series of camera shake detection when performing camera shake correction is the same as the current state in which the camera is held and the camera is held in the hand. This is to remove this data since there is no guarantee that it exists and it is meaningless to use this data as a standard.

Then, in the next step S19, each data Ak(1) to Ak(32) at 32 points is sampled, and in the next step S20, the blur change amount data Bk is determined according to the following equation.

[0072]

[Equation 3] Furthermore, in step S20, camera movement speed data Vk is obtained as Vk=f(Vk-1, Bk, Bk-1), and this calculation is performed by the first calculation circuit forming the calculation means 10. 10a.

In detail, first, the current Vk is calculated based on the current Bk, this current Bk is stored in the first memory 11a as a first storage means, and the current Vk is also calculated as the second The data is stored in the second memory 11b as a storage means.

When the next Bk sent from the sampling circuit 6b is received by the first arithmetic circuit 10a, the current Bk stored in the first memory 11a is changed to the previous Bk-1 and becomes the previous Bk-1. 1 memory 11a to the first arithmetic circuit 10a.

Regarding the current Vk stored in the second memory 11b, the current Vk is also stored in the first arithmetic circuit 1.
The next Bk sent from the sampling circuit 6b at 0a
When it is accepted, it is set to the previous Vk-1 and inputted from the second memory 11b to the first arithmetic circuit 10a. Therefore, it is possible to perform the calculation Vk=f(Vk-1, Bk, Bk-1).

In the next step S21, it is determined whether or not the focus motor flag Mf is "0", that is, 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. =k+1, and the process returns to step S19, and steps S19, S20, and S21 are executed again.

If the focus motor 7 is stopped in step S21, the branch goes to YES and the process moves to the next step S22, k=kmfs+C2 (kmfs: value of k at the end of AF)
A judgment will be made.

The reason why this judgment is made is that the output of the camera shake detector 6 immediately after driving the focus motor 7 and stopping the motor at the time of focusing contains a shock component due to the motor stopping. If used for predictive calculation, accurate predictive driving cannot be performed, so k at the end of AF
This is to wait until after sampling C2 (for example, 5) more than the value of (kmfs).

If YES in step S22, the process moves to the next step S24, and the release switch 21 is
It is determined whether or not is ON, and if it is not ON, it is incremented in step S23 and the step S23 is incremented.
Steps 19 to S22 are executed again.

[0080] If step S24 is YES, the process moves to step S25, and BLwide=f(Vk, Dx)
is calculated, and then in step S26 BLzp=f(BL
wide, Zpx) is performed, and the next step S2
7, conversion of BLzp to BL is performed.

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

First, the relationship 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, the relationship between the zoom position data Zpx. The relationship is that even if the amount of camera shake is the same, the longer the focal length, the greater the movement of the image position on the film plane.

Therefore, if the reference zoom position in the photographing optical system is set to the WIDE (wide-angle) side, and the blur correction data at this time is designated as the reference blur correction data BLwide,
The blur correction amount data BLzp is expressed as BLzp=f(BLwide, Zpx).

Note that if the zoom position data Zpx does not have a linear relationship with the actual focal length change, approximate calculation is used to calculate BLzp=BLwide×f(Zpx) where f(Zp
x)=a0+a1Zpx or f(Zpx)=a0+a
The format is 1Zpx+a2Zpx2.

[0085] Here, a0, a1, and a2 are predetermined constants.

Now, the above-mentioned reference blur correction data BLw
As shown in step S25, BLwide=f(Vk,
Dx) holds, and the necessity of the subject distance data Dx in this case will be explained using FIG.

In the photographing optical system R, which has a film surface 2 inside the camera body P toward the rear and a principal point Q inside toward the front, the camera body P moves upward by a distance y1 with respect to the optical axis O. If it moves, the imaging point for point A1 is the intersection point A3 of the straight line connecting point A1 and point B2 and film surface 2.
become. Note that the above-mentioned point B2 is a point above the intersection B1 of the vertical line of the principal point Q and the optical axis O by a distance y1.

On the other hand, the imaging point of point A1 at the initial position (pre-movement position) of the camera body P is point A2, and this point A2 becomes point A4 on the film surface 2 after the camera is moved.
(a point moved upward by a distance y1 from point A2), so the camera body P has moved upward by a distance y1. Considering film plane 2 as a reference, point A4 is a point A.
It will be the same as moving to 3.

Here, considering a method for preventing the imaging position from moving even if the camera body P moves upward by a distance y1, the intersection point B3 of the straight line connecting points A1 and A4 and the position of the principal point Q. All you have to do is adjust the photographic optical system to move it. Amount of this movement (difference distance between point B2 and point B3)
If the distance is y2, the distance from principal point Q to film surface 2 is x1, and the distance from point A1 to principal point Q is x2, then y1/(x1+x2)=(y1-y2)/x2 holds true. , the distance y2 is y2={x1/(x1+x2)}·y1.

Therefore, the distance y2 is affected by the distance x2 (subject distance).

Therefore, the object distance data Dx is also required when converting the camera movement speed data Vk into the reference blur correction data BLwide, and as shown in step S25 above, BLwide=f(Vk,D
x) is required.

[0092] If the subject distance data Dx does not have a linear relationship with respect to the change in distance x2, BLwide=Vk×f is calculated in the same way as in the case of correction by approximate calculation of the zoom position data Zpx. (Dx) However, f(Dx)=b0+b1Dx or f(Dx)=b0+
The format is b1Dx+b2Dx2. Note that the symbols b0, b1, and b2 are predetermined constants.

On the other hand, as mentioned above, the camera movement speed data Vk is the movement speed of the imaging position on the film surface.
If this is used as is at the current moving speed, a response delay will occur as described above. Although this has already been explained using FIG. 17, it can be expressed as in the following equation.

[0094]

[Equation 4] Or, Vk=f(Vk-1, Bk)=(Vk-1)+Bk.

Now, the calculation means 10 performs camera shake prediction correction based on the current shake change amount data Bk, the previous shake change amount data Bk-1, and the previous camera movement speed data Vk-1, Specifically, in this embodiment, when the state of camera shake has a substantially sinusoidal waveform as shown in characteristic a shown in FIG. 8, the shake correction drive that follows the movement becomes as indicated by symbol b. .

That is, as shown in an enlarged view in FIG. 9, the velocity of point B1 at current time t and the velocity of point A1 at time t-It, which is one integration time It before time t, are calculated from time t. Time point t+ which is one integration time It
The speed of point C2 at time It is predicted, in other words, the speed of point C1 at time t+It is determined by linear approximation.

[0097] Although it is desirable that points C1 and C2 coincide completely, in reality, the change in characteristic a is approximately sinusoidal and the prediction is obtained by linear approximation, so a slight error component occurs. However, in normal cases, this amount is negligible and does not cause any particular problem.

Then, the camera movement speed data Vk at the predicted time t+It becomes Vk=f(Vk-1, Bk, Bk-1), and from another perspective, Vk=Vk-1+2Bk-Bk-1 Obtainable.

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

Specifically, the actuator drive circuit 14
It will be held in This blur correction drive data BL is obtained by obtaining the blur change amount data Bk obtained by the camera shake detection unit 6 multiple times, and based on this, a predetermined predicted time point (in this embodiment, a time point after the integration interval It) is obtained. ) is obtained by predictive calculation of the amount of camera shake correction at the time of prediction, and corresponds to the amount of camera shake at the time of prediction. Therefore, in order to correct camera shake at the time of prediction, the shake correction amount data BLzp is converted into shake correction drive data BL whose phase is inverted so as to cancel the camera shake.

Therefore, in step S27, the blur correction amount data BLzp is converted to blur correction drive data BL, and in the next step S28, the blur correction actuator 9 is driven, and the correction optical member 5 is moved in a direction perpendicular to the optical axis O. By moving the image to , camera shake prediction correction is performed.

When the correction optical member 5 is driven by the blur correction actuator 9 in step S28, the blur correction actuator 9 is at a predetermined initial position, that is,
As shown in FIG. 5, since the central optical axis of the image stabilization actuator 9 is located at a position L0 that coincides with the optical axis O located on the extension of the center of the film surface 2, the movement range of the image stabilization actuator 9 is L can freely move between an upper range L+ and a lower range L- with respect to the optical axis O.

Therefore, the actuator position detection circuit 27
The position data G1 detected by is the center position corresponding to the optical axis O, and by inputting this position data G1 to the CPU 15, the gain correction calculation circuit 2 is sent from the CPU 15.
Since the difference position data G1 (difference data between the position corresponding to the position data G0 and the center position) outputted from the gain correction calculation circuit 28 is 0, the correction data G2 outputted from the gain correction calculation circuit 28 is This corresponds to the gain necessary to drive the correction actuator 9 to the maximum.

Therefore, the output data from the third arithmetic circuit 10c, that is, the blur correction amount data BLzp is transmitted to the correction circuit 14.
a to the drive circuit 14b, and the drive circuit 14b
is converted into blur correction drive data BL, and the blur correction actuator 5 is driven.

[0105] Then, in the next step S29, the shutter is opened, and in the next step S30, the time of the sampling interval It is subtracted from the shutter time Ss. It is determined whether or not there is, and in the case of NO, in order to perform sampling again, the number of samplings k is determined in the next step S32.
is incremented.

[0106] Then, from step S33 to step S3
Step 4 is performed in the same manner as steps S19 and S20 described above, and the process moves to the next step S35. In step S35, the actuator position detection circuit 27 detects the current position of the blur correction actuator 9, and outputs position data G1 to the CPU 15. It is determined whether the value is greater than the value C3.

If the current position of the blur correction actuator 9 driven in step S28 above approaches the limit of the upper range L+ or the lower range L- shown in FIG. 5, and the blur correction actuator 9 is driven in this state, the stopper There is a possibility of collision with a member (not shown). Therefore, the above-mentioned limit value C3 is set corresponding to the position where the blur correction actuator 9 is caused to collide.

[0108] If NO in step S36, that is, the position data G
1 (current position data Aposi) is less than or equal to the limit value C3, the process moves to the next step S38, and when the gain correction calculation circuit 28 supplies the drive signal corresponding to the blur correction amount data BLzp to the drive circuit 14b. The gain Bgain of is calculated as correction data G2 and supplied to the correction circuit 14a.

This gain Bgain has a characteristic shown by symbol g in FIG. 6, and when the actuator position is at the upper limit or lower limit corresponding to the upper range L+ and lower range L- in FIG. , when the gain Bgain is 0, the gain increases as the actuator position approaches the center from the upper or lower limit, and reaches the maximum gain, that is, 1, when the actuator position coincides with the center.

Further, such a gain change (characteristic) may be such that the gain changes gradually as the actuator position changes, as shown in the characteristic curve indicated by the symbol h in FIG.

[0111] Then, in the next step S39, BL is calculated based on the gain data Bgain obtained in step S38.
wide=f(Vk, Dx) is calculated, and in the next step S40, BLzp=f(BLwide, Zpx) is calculated, and in the next step S41, conversion from BLzp to BL is performed.

In the next step S42, the blur correction actuator 9 is driven based on the blur correction drive data BL obtained in the above-mentioned step S41. At this time, the current position of the blur correction actuator 9 is Since the position detection circuit 27 determines this and controls the overall drive gain in the actuator drive circuit 14 in accordance with this information, collisions between the blur correction actuator 9 and the correction optical member 5 do not occur.

After the actuator is driven in step S42, the process returns to step S30, and step S3
0, the time Ss obtained by subtracting the sampling interval It from the shutter seconds is determined, and in the next step S31 it is determined whether the time Ss is less than or equal to 0, and if NO, then step S32 is performed in the same manner as described above. Step S42 is then performed again.

On the other hand, if YES in step S36, that is, it is determined that the current position data Aposi exceeds the limit value C3, the CPU 15 displays a warning on the display 29, and performs complete blur correction. A warning is given to the effect that
2 is executed.

However, at this time, the correction data G2 for the actuator drive circuit 14 is controlled to be the maximum gain that does not cause collisions of members, since collisions of members will occur if complete blur correction is performed. It becomes like this.

These steps S32 to S4
2 is repeated in the judgment made in step S31.
<0? In other words, while the shutter is open, blur prediction correction is repeatedly performed based on blur detection. Moreover, the actuator is driven with a drive gain that prevents collisions of members.

[0117] If YES in step S31, the process moves to step S43, and it is determined whether or not the shutter is closed; if the result is NO, the process moves to step S43 again.
is executed and placed in a standby state, and if YES, the process moves to the next step S44, where the blur correction actuator 9 is driven in the opposite direction to the blur correction direction and returned to the initial position.

In the next step S45, the actuator drive circuit 1 is activated by the prohibition signal I sent from the CPU 15.
4 is stopped, and the blur correction actuator 9 is stopped.

[0119] Next, in step S46, the sampling circuit 6b of the camera shake detector 6 stops operating in response to the prohibition signal I sent from the CPU 15 in the same manner as in step S45 described above, and the process moves to the next step S47. In preparation for photographing, film feeding such as film winding and shutter charging is performed, and the first system of operations in the sequence of camera shake prediction correction is completed.

On the other hand, in the operation of the second system, when the focus motor flag becomes "1" in the above-mentioned step S8, the process moves to step S48, and the photometry circuit 20
The shutter speed and aperture value corresponding to the appropriate exposure value are determined based on the measured value.

At the same time, the AF circuit 16
5, and the object distance data Dx obtained at this time is converted into focus drive data Dfx by the AF data conversion circuit 17.
In the next step S49, focus driving is performed using this data Dfx.

Next, in step S46, similarly to step S45, the sampling circuit 6b of the camera shake detector 6 stops operating in response to the prohibition signal I sent from the CPU 15, and the process moves to the next step S47.
Film feeding such as film winding and shutter charging is performed in preparation for the next photographing, and the first system of operations in the sequence of camera shake prediction correction is completed.

On the other hand, the operation of the second system moves to step S48 when the focus motor flag becomes "1" in the above-mentioned step S8, and the photometry circuit 20 performs photometry under control based on a command from the CPU 15. The shutter speed and aperture value corresponding to the appropriate exposure value are determined based on the measured value.

At the same time, the AF circuit 16
5, and the object distance data Dx obtained at this time is converted into focus drive data Dfx by the AF data conversion circuit 17.
In the next step S49, focus driving is performed using this data Dfx.

Next, the process moves to step S50, and Dfx-
A determination is made as to whether Pix=0. This judgment is based on the focus motor 7 when actually driving the focus.
Focus drive amount data D corresponding to the number of drive steps
Step number data Pix generated in the photo interrupter 18 every time fx and the focus motor 7 are driven step by step.
This is to determine whether or not the cumulative value of the focus motor 7 has become equal to the cumulative value of the focus drive.

[0126] If NO in step S50, the step drive of the focus motor 7 is continued; if YES, it is determined that the focus drive has been completed, and in the next step S51, the step drive of the focus motor 7 is continued. The drive is stopped.

In the next step S52, 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, and the first system as described above is set. Flows are executed in parallel to provide for blur correction, film exposure, etc.

Therefore, in the first embodiment described so far, camera shake detection is performed at predetermined intervals (sampling interval It
), and based on three types of data: blur change amount data Bk obtained this time, blur change amount data Bk-1 obtained last time, and camera movement speed data Vk-1 obtained last time. 8 and 9 because predictive calculations are being performed.
Assuming that the camera shake vibration is approximately sinusoidal as shown in characteristic a shown in , the amount of shake drive at the next time point t+It is determined by linear approximation based on the data at the current (this time) time point t and the previous time point t-It. Therefore, blur correction can be performed at a position approximately equal to the blur vibration at the next time point t+It.

Therefore, as shown in FIG. 10, the motion of the image on the film surface is such that the shake amount characteristic e is approximately equal to the approximately sinusoidal correction amount characteristic d, and when correction is made using the correction amount characteristic d, the characteristic As shown in f, only a very small amount of undercorrection remains. Since this amount of undercorrection is extremely small, it does not cause any substantial adverse effects.

[0130] In the above embodiment, the prediction calculation performed to cancel camera shake uses three types of data: the currently obtained shake change amount data Bk and the previously obtained shake change amount data B.
k-1 and previously obtained camera movement speed data Vk-1
Since the image stabilization is performed based on the data, it is possible to perform image stabilization with excellent followability, making it possible to create a camera that is generally satisfactory under general conditions.

By the way, if it is necessary to perform more advanced and better image stabilization, for example under more severe conditions such as using a telephoto lens with a relatively large focal length, the method described below can be used. It may be configured as in the second embodiment.

That is, a second embodiment of the present invention will be explained using FIGS. 11 to 14.

FIG. 11 shows the circuit configuration of the second embodiment of the present invention, and the parts that differ from the configuration shown in FIG. 1 above are as follows.
There are only arithmetic means 30 and storage means 31, and in order to avoid redundant explanation, the same parts are given the same reference numerals.

[0134] The basic configuration of the calculation means 30 includes first, second,
The third arithmetic circuits 30a, 30b, 30c are connected in series, and the storage means 31 includes the first, second,
It has third memories 31a, 31b, and 31c.

The first arithmetic circuit 30a described above has Vk=f
(Vk-1, Bk, Bk-1, BK-2) However, Vk: (current) camera movement speed data Vk-1: (previous) camera movement speed data Bk: (current) blur change amount data Bk -1: (previous) shake change amount data Bk-2: (previous) shake change amount data is determined, and each of the second arithmetic circuit 30b and the third arithmetic circuit 30c is The second arithmetic circuit 10b and the third arithmetic circuit used in the example
This is similar to the arithmetic circuit 10c (see FIG. 1).

On the other hand, the output terminal of the sampling circuit 6b, that is, the output terminal of the camera shake detection section 6, is connected to the input terminal of the first memory 31a. It is connected to the input end of the first arithmetic circuit 30a.

Furthermore, 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 this second memory 31b is connected to the input end of the first arithmetic circuit 30a. Further, the input end of the third memory 31c is connected to the output end of the first arithmetic circuit 30a, and the output end of the third memory 31c is connected to the input end of the first arithmetic circuit 30a.
connected to the input end of the

Next, the image stabilization operation in the camera with an image stabilization function according to the second embodiment configured as above will be explained.

The flowcharts shown in FIGS. 12 and 13 show the operation of this embodiment, and have many parts that are the same as the flowcharts (FIGS. 2 and 4) in the above-mentioned first embodiment. A description of the case where the same operation is performed in both cases will be omitted, and only the parts that perform different operations will be described.

In FIGS. 12 and 13, step P1
to step P19 and step P44 to step P47 are step S1 in the first embodiment described above.
The operations are the same as those in ~S19 and S44~S47. Therefore, after steps up to step P19 are executed in the same manner as in the first embodiment described above, the process moves to step P20.

In this step P20, the blur change amount data Bk and the camera movement speed data Vk are input to the sampling circuit 6.
b is obtained as shown in the following equation.

[0142]

[Equation 5] Furthermore, the camera movement speed data Vk is calculated by the first arithmetic circuit 3
0a as shown in the following formula.

Vk=f(Vk-1, Bk, Bk-1, Bk-2) The details are as follows: The current camera movement speed data Vk is calculated based on the current shake change amount data Bk, and the current camera movement speed data Vk is calculated based on the current shake change amount data Bk. Change amount data Bk is stored in the first memory 31a, and similarly, current camera movement speed data Vk is stored in the third memory 31c.

[0144]The current shake change amount data Bk stored in the first memory 31a will be the same as the previous shake change amount data Bk when the next shake change amount data Bk sent from the sampling circuit 6b is received by the first arithmetic circuit 30a. Bk-1 and is input from the first memory 31a to the second memory 31b and simultaneously input to the first arithmetic circuit 30a.

[0145] Further, the previous blur change amount data Bk-1 stored in the second memory 31b is stored in the first arithmetic circuit 30.
When the next Bk sent out from the sampling circuit 6b is accepted at time a, it is set as Bk-2 of the time before the previous one, and is input from the second memory 31b to the first arithmetic circuit 30a.

Furthermore, the current camera movement speed data Vk stored in the third memory 31c is stored in the first arithmetic circuit 30.
When the next Bk sent out from the sampling circuit 6b is accepted at a, it is set to the previous Vk-1 and inputted from the third memory 31c to the first arithmetic circuit 30a. Therefore, the calculation of Vk=f(Vk-1, Bk, Bk-1, Bk-2) can be performed.

Then, in the next step P21, it is determined whether the focus motor flag Mf is "0", that is, whether the focus motor 7 is stopped. The operations from this step P21 and subsequent steps up to step P33 are as follows:
This is the same as steps S21 to S33 (FIG. 4) in the first embodiment described above.

[0148] Step P34, which is executed after step P33 is executed, is carried out in the same manner as step P20 described above, and steps P35 to P42 are as follows.
Steps P35 to P42 shown in FIG. 4 described above are executed in the same manner.

On the other hand, if "Ss<0?" becomes YES in step S31, the process moves to step P43, where it is determined whether the shutter is closed or not. If the answer is NO, the process moves to step P43 again. is executed and placed in standby state, YE
In the case of S, the process moves to the next step P44, where the blur correction actuator 9 is driven in the opposite direction to the blur correction direction and returned to the initial position, and the process moves to the next step P45.
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.

[0150] Next, in step P46, the C
The sampling circuit 6b of the camera shake detection unit 6 stops operating in response to the prohibition signal I sent from the PU 15, and the process moves to the next step P47, where film feeding such as film winding and shutter charging is performed in preparation for the next shooting. , the first system of operations in the camera shake prediction and correction sequence is completed.

On the other hand, the operation of the second system is from step S9 to step S1 in the first embodiment shown in FIG.
Steps P9 to P16 are performed in the same manner as in steps P6 to P6.

Therefore, in the second embodiment described so far, camera shake detection is performed at predetermined intervals (sampling interval It
), the blur change amount data Bk obtained this time, the blur change amount data Bk-1 obtained last time, the blur change amount data Bk-2 obtained two times before, and the camera movement speed data obtained last time. Since predictive calculations are performed based on four types of data including Vk-1, if the camera shake is approximately sinusoidal as shown in characteristic a shown in Figure 14, the camera shake correction will follow the movement. The drive becomes as indicated by the symbol b.

[0153] Then, the velocity of point C2 at the current time t and the time t- which is one integration time It before the time t.
The velocity of point B1 at It and the time t-2 2It before
From the speed of point A1 at It, the speed of point D3 at time t+It, which is It after time t, is calculated by curve approximation.

[0154] That is, 2 of time t-2It and time t-It
Letting Δ be the difference between the speed C1 at time t and the actual speed (velocity at point C2) found from each data at the time, Δ is Δ=Bk-1-Bk.

[0155] Therefore, point D1 found from point B1 and point C2
The data at point D2, which is obtained by subtracting Δ from the data at point D2, is predicted to be the speed at time t+It, which is after time t and It. If we convert this into a formula, Vk=f(Vk
-1, Bk, Bk-1, Bk-2), and from another perspective, Vk=Vk-1+3Bk-3Bk-1+Bk-2.

That is, the camera movement speed Vk-1 for camera shake correction for the previous time (time t-It), and the blur change amount data (integration result) for the previous time (time t-It) and the time before the previous time (time t-2It), respectively. ) Bk-1 and Bk-2 are temporarily stored in the first and second memories 31a and 31b,
This stored data and the current (time t) shake change amount data B
Camera movement speed data Vk is calculated using the camera movement speed data Vk, and based on this data Vk, blur change amount data Bk at time t+It is calculated, and prediction is performed using so-called curve approximation.

[0157] Therefore, in this second embodiment, it is possible to perform blur correction at a higher speed and with higher precision than in the first embodiment, so that it is possible to perform hand-held telephoto shooting, which was previously considered impossible. Photography is now possible.

[0158] In addition, in this embodiment, in addition to performing prediction using curve approximation as described above, when driving the optical correction member 5, the current position of the blur correction actuator 9 is detected and its position is Based on the results, the blur correction actuator 9 is driven with the maximum drive gain that does not cause collision of members, so it is possible to prevent the correction optical member 5 and the blur correction actuator 9 from colliding with a stopper member or the like. .

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

For example, the correction optical member is not limited to the example described above, but a wedge-shaped prism may be arranged perpendicular to the optical axis and moved up and down when performing blur correction.

[0161] Furthermore, in the above-mentioned embodiment, data from each of a plurality of times is used as data necessary for performing prediction calculations, but at that time, as in the above-mentioned first embodiment, the previous and current data are used. It may be done twice, or it may be done three times: data from the day before last, data from last time, and data from this time as in the second embodiment, or it may be done more times than this. This number of times can be arbitrarily determined depending on the measurement interval, the required image stabilization accuracy, manufacturing cost, etc.

Further, as a specific example of the camera shake detecting section used in the camera according to the present invention, as shown in the above-mentioned first and second embodiments, a shake sensor 6a made of a semiconductor type acceleration sensor is used. The sampling circuit 6b is not limited to the one that detects the acceleration generated in the camera body and integrates it over a predetermined period, but may also be a gyro-type accelerometer, etc. In short, the data corresponding to the camera shake occurring in the camera body is used. Any signal that can be obtained as an electrical signal is fine.

Furthermore, the camera according to the present invention can be used not only when the photographing lens is a zoom lens as explained in the first and second embodiments, but also when a bifocal camera or a single focus camera is used. Of course, the same application as described above can be applied, and the correction optical member may be a part or all of the focus lens group or the zoom lens group, or the focus lens group and the zoom lens group may exist independently. There's no need.

Furthermore, in the first and second embodiments described above, the drive gain for collision prevention is controlled by the drive circuit 1.
The drive gain in 4b is set to a large specific value,
When the shake correction actuator 9 is at the center position, the gain is set to 1.
The gain is decreased as the current position moves upward or downward, but the drive gain in the drive circuit 14b is set to a small specific value, and the correction circuit 14
The drive gain may be set large during steady state (when the blur correction actuator 9 is located at the center) at b, and the gain may be changed depending on the current position of the blur correction actuator 9.

Furthermore, as a specific example of controlling the drive gain of the actuator, as shown in the first and second embodiments described above, the original blur correction amount data BLzp output from the calculation means 10 is controlled. Alternatively, the input signal to the calculation means 10 or the input signal itself to the calculation means 10 may be controlled to provide a drive gain for collision avoidance.

[0166]

[Effect of the invention] As is clear from the above explanation, claim 1
The invention according to claims 3 to 3 provides camera movement speed data for each of a plurality of points at predetermined time intervals when driving a correction optical member inserted in an optical path of a photographing optical system in a direction for correcting blur. Predictive calculations are performed based on the shake change amount data to obtain shake correction data at the time when the above-mentioned correction optical member is driven, and camera shake correction is performed in accordance with this data. Regardless of the size of the camera shake, or even if the camera shake occurs continuously, correction can be performed to effectively cancel out the camera shake, resulting in good photos without blurring. We can provide a camera that can take pictures.

[0167] Furthermore, since the drive gain of the blur correction drive is controlled according to the current position of the correction optical member or the blur correction actuator, collisions of parts can be prevented and all the drives of the correction optical member or the blur correction actuator are controlled. can be enabled over a range of

In particular, the invention of claim 2 is configured to stop the shake correction when the amount of camera shake corresponding to the camera shake detection data obtained by the camera shake detector becomes larger than a predetermined setting value. No needless blur correction drive is performed when correction is impossible.

[0169] In particular, the invention of claim 3 is such that when the correction optical member is located at the limit end of its vertical movement when performing blur correction drive, it provides a drive to the extent that it does not collide with the limit end. In addition, since a warning such as a display is given, correction driving can be performed over the entire movement range of the correction optical member.

[Brief explanation of drawings]

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

FIG. 2 is a flowchart for explaining the operation of the first embodiment.

FIG. 3 is a waveform diagram for explaining a sampling operation in the first embodiment.

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

FIG. 5 is an optical path diagram showing the movement state of the correction optical member.

FIG. 6 is a characteristic diagram showing drive gain.

FIG. 7 is an optical path diagram for explaining the relationship between camera shake and changes in the imaging point.

FIG. 8 is a waveform diagram showing the state of camera shake correction in the first embodiment.

FIG. 9 is a partially enlarged view of FIG. 6;

FIG. 10 is a waveform diagram showing the amount of camera shake after camera shake correction in the first embodiment.

FIG. 11 is a block diagram showing a circuit configuration in a second embodiment of the present invention.

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

FIG. 13 is a flowchart for explaining the operation of the second embodiment.

FIG. 14 is a waveform diagram showing the operating state of camera shake correction in the second embodiment.

FIG. 15 is an optical path diagram conceptually showing the operation of a conventional camera with an image stabilization function.

FIG. 16 is a waveform diagram showing a correction operation of a conventional camera with an image stabilization function.

FIG. 17 is a partially enlarged view of FIG. 14;

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

[Explanation of symbols]

1 Photographing optical system 2 Film surface 3 Focus lens group 4 Zoom lens group 5 Correction optical member 6. Camera shake detection section 6a Shake sensor 6b Sampling circuit 7 Focus motor 8 Zoom motor 9 Shake correction actuator 10, 30 Arithmetic means 10a, 30a First arithmetic circuit 10b, 30b Second arithmetic circuit 10c, 30c Third calculation circuit 11, 31 Memory means 11a, 31a First memory 11b, 31b Second memory 31c Third memory 12 Focus drive circuit 13 Zoom drive circuit 14 Actuator drive circuit 14a Drive circuit 14b Correction circuit 15 CPU 16 AF circuit 17 AF data conversion circuit 18 Photo interrupter 19 Zoom position detection circuit 20 Photometry circuit 21 Release switch 22 Photometering switch 23 Zoom switch 24 Feeding motor 25 Feeding drive circuit 26 Memory 27 Actuator position detection circuit 28 Gain correction calculation circuit 29 Display O Optical axis P Camera body Q Main point R Shooting optical system

Claims (3)

[Claims] Claim 1: A correction optical member inserted into the optical path of a photographing optical system in order to correct the movement of the image position on the film surface caused by camera shake, and a correction optical member that is necessary for the correction optical member. a shake correction actuator that moves or tilts the camera body in a direction; a camera shake detection section that converts camera shake of the camera body into an electrical signal to obtain camera shake detection data; and a camera shake detection unit that detects the position of the correction optical member or the position of the shake correction actuator. a focal length detection means for detecting a focal length of the photographing optical system at the time of photographing and outputting focal length data; and a lens for when the photographing optical system is in focus during photographing. a subject distance detection means for outputting feed amount data or subject distance data; camera shake detection data obtained by the camera shake detection section; focal length data obtained by the focal length detection means; and a subject obtained by the subject distance means. a calculation means for calculating blur correction data for driving the blur correction actuator to correct the movement of the image position on the film surface due to camera shake of the camera body based on the distance data; A camera with an image stabilization function, comprising: correction calculation means for generating correction data for weighting the amount of movement based on the position data obtained by the position detection means. 2. A correction optical member inserted into the optical path of a photographing optical system in order to correct the movement of the image position on the film surface caused by camera shake, and a correction optical member as required. a shake correction actuator that moves or tilts the camera body in a direction; a camera shake detection section that converts camera shake of the camera body into an electrical signal to obtain camera shake detection data; and a camera shake detection unit that detects the position of the correction optical member or the position of the shake correction actuator. a focal length detection means for detecting a focal length of the photographing optical system at the time of photographing and outputting focal length data; and a lens when the photographing optical system is in focus during photographing. a subject distance detection means for outputting feed amount data or subject distance data; camera shake detection data obtained by the camera shake detection section; focal length data obtained by the focal length detection means; and a subject obtained by the subject distance means. a calculation means for calculating shake correction data for driving the shake correction actuator to correct the movement of the image position on the film surface due to camera shake of the camera body based on the distance data; determining means for outputting a shake correction stop signal when the amount of camera shake corresponding to the camera shake detection data becomes larger than a predetermined setting value; and at least the correction optical member when the shake correction stop signal is input from the determining means. 1. A camera with an image stabilization function, comprising: control means for controlling the image stabilization drive to be stopped by the image stabilization function. 3. A correction optical member inserted into the optical path of the photographing optical system to correct the movement of the image position on the film surface caused by camera shake of the camera body, and a correction optical member that is necessary for the correction optical member. a shake correction actuator that moves or tilts the camera body in a direction; a camera shake detection section that converts camera shake of the camera body into an electrical signal to obtain camera shake detection data; and a camera shake detection unit that detects the position of the correction optical member or the position of the shake correction actuator. a focal length detection means for detecting a focal length of the photographing optical system at the time of photographing and outputting focal length data; and a lens for when the photographing optical system is in focus during photographing. a subject distance detection means for outputting feed amount data or subject distance data; camera shake detection data obtained by the camera shake detection section; focal length data obtained by the focal length detection means; and a subject obtained by the subject distance means. a calculation means for calculating blur correction data for driving the blur correction actuator to correct movement of the image position on the film surface due to camera shake due to camera body shake based on the distance data; a correction calculation means for generating correction data for weighting the amount of movement based on the position data obtained by the position detection means, and a correction optical member obtained by the position detection means while the correction optical member is being driven for correction. 1. A camera with an image stabilization function, characterized in that the camera is equipped with a warning means for giving a warning when a position corresponding to the obtained position data is near the movement limit end of a correction optical member or a blur correction actuator.