JPH04308823A - Camera provided with jiggle correction function - Google Patents

Abstract

PURPOSE:To simplify constitution, to miniaturize a camera, and to lower power consumption by limiting the jiggle correction drive range for cancelling the jiggle at the time of photographing. CONSTITUTION:The jiggle which occurs when a release switch 221 is pressed down is detected by a sensor 6a. Jiggle detecting data are sampled at a sampling circuit 6b, are stored in a first memory 11a, and are inputted to an arithmetic circuit 10, then the jiggle correcting data are calculated, and are stored in a second memory 11b. The arithmetic circuit 10 calculates next jiggle correction data based on the jiggle detection data of this time and of previous time, and the jiggle correction data of this time. By receiving this jiggle correction data, a jiggle correcting actuator 9 drives an optical member 5 for correction in order to cancel the movement of an image position caused by the jiggle. A discriminating circuit 27 generates an inhibiting signal 1 in order to inhibit the jiggle correcting actuator 9 from being driven when the jiggle is discriminated to be above the range to be driven the jiggle correction.

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 abbreviated as a "camera") is integrated into the camera body as shown in FIG. , or a photographing optical system 1 is provided removably 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 of 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 15, in order to compensate for camera shake, the first step is to The camera shake detection unit detects the speed V in a very short period of time, calculates and obtains the shake change amount data Bk based on the detected data at this time, and determines the camera shake correction command signal Da based on this shake change amount data Bk. 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). The image stabilization command signal Da is generated based on the camera movement speed data Vk and Vk-1.

Therefore, as shown in FIG. 17, the movement of the image on the film surface is a corrected characteristic f when corrected by 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 varied 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 is something that makes me do it.

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

The degree of occurrence of camera shake differs depending on the focal length of the photographing optical system. That is,
The larger the focal length, or in other words, the closer the camera is to the telephoto side, the greater the magnification of the subject image on the film surface. Since the amount of blur in the subject image on the film surface increases, the amount of blur correction must be increased accordingly.

Furthermore, the degree of occurrence of camera shake differs depending on the length of the shutter speed set at the time of photographing. In other words, when the set shutter time is short, the range of subject image blur on the film plane becomes small, and conversely, when the set shutter time is long, the subject image blur range on the film plane becomes large. .

For this reason, even if the amount of camera shake remains the same, the longer the set shutter time is, the greater the amount of blur of the subject image on the film surface becomes. must be increased.

[0015]

[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.

In other words, since a time delay (see reference numeral c in FIG. 15) 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.

[0017] 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.

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. The purpose of the present invention is to provide a camera that performs appropriate correction and does not cause blur in the photographed photographs.

[0019] In addition, it is ideal that the blur correction drive performed when performing blur correction be performed reliably over the entire range, regardless of the focal length and the set shutter time. In view of the fact that this would result in an increase in the configuration related to the image stabilization drive, an increase in size, and an increase in power consumption, it would not be possible to achieve the compactness of the camera, which is the original mission of the camera. The purpose of the present invention is to create a camera that achieves the above-mentioned objectives and does not impair the compactness of the camera by discontinuing the image stabilization drive over the entire range and discontinuing it at a certain point depending on the length of the set shutter time. It is about providing.

[0020]

[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 necessary direction, and a shake correction actuator that converts the camera shake of the camera body into an electrical signal and collects camera shake detection data at multiple points in time. and the camera shake detection data obtained at multiple points in time to correct the movement of the image position on the film surface due to camera shake by driving the compensation optical member with the camera shake compensation actuator. a calculation means for calculating blur correction data based on the camera shake correction data; a set time detection means for detecting set shutter time data at the time of shooting; a focal length detection means for detecting the focal length of the photographing optical system at the time of shooting; A prohibition means for prohibiting the blur correction operation by the correction optical member, and a camera shake caused by camera shake based on the shutter speed setting data detected by the setting speed detection means and the focal length data detected by the focal length detection means. a determination means for outputting a blur correction prohibition signal when the image movement on the surface falls within an allowable range; and a determination means for activating the prohibition means to perform the correction when the blur correction prohibition signal is output from the determination means. The present invention is characterized by comprising a control means for controlling to prohibit the blur correction operation by the optical member.

The invention of 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 an optical member in a required direction; an image stabilization actuator that converts the camera body's camera shake into an electrical signal to obtain camera shake detection data at multiple points in time; a calculation means for calculating blur correction data based on the camera shake detection data obtained at a plurality of points in time in order to correct the movement of the image position by driving the correction optical member with the blur correction actuator; a set shutter time detection means for detecting a set shutter time at a predetermined slow speed; a prohibition means for prohibiting the blur correction operation by the correction optical member; a determination means for outputting a blur correction prohibition signal when the time is longer than the shutter time; and a determination means for activating the prohibition means when the shake correction prohibition signal is output from the determination means, and blur correction by the correction optical member. The apparatus is characterized by comprising a control means for controlling the operation so as to prohibit the operation.

Furthermore, the invention according to claim 3 determines that the determining means according to claim 2 is a predetermined slow shutter time when the shutter time is set to a valve time or a time time, and sends a blur correction prohibition signal. It is characterized by being configured to output.

[0023]

[Function] A camera with an image stabilization function configured as described above has a correction device inserted in the optical path of the photographic optical system to correct the movement of the image position on the film plane caused by camera shake in the camera body. When driving the image stabilization actuator that moves or tilts the optical member in a specified direction, the camera body's camera shake is converted into electrical signals at multiple points in time using the camera shake detector, and the camera shake is converted into multiple pieces of camera shake detection data. Based on this, blur correction data is calculated using a calculation means. When performing image stabilization by driving the image stabilization actuator in accordance with the output data of this calculation means, the shutter speed and focal length are detected, and the above-mentioned image stabilization drive is performed when the occurrence of camera shake can be practically ignored. If the occurrence of camera shake cannot be substantially ignored, regular shake correction driving is performed.

In addition, if the shutter speed setting is slower than the predetermined shutter speed or if the valve or timer speed is set, it is determined that the blur correction drive is not possible, and the above-mentioned blur correction is performed. I try not to drive it.

[0025]

Embodiments Hereinafter, embodiments of the present invention will be explained in detail with reference to FIGS. 1 to 13. First, a first embodiment of the present invention will be described using FIGS. 1 to 9.

FIG. 1 shows the circuit configuration of the first embodiment of the present invention.
As seen in compact cameras, a film surface 2 is located on the optical axis O of a photographing optical system 1 that is either integrated into a camera body or detachably provided via a lens mount or the like.

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.

Further, the camera body is provided with a camera shake detection section 6. 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.

Furthermore, a CPU 15 is provided that issues commands for controlling various parts provided within the camera body in a complex manner, and an AF circuit 16 is connected to this CPU 15 for distance measurement and automatic focusing. has been done.

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 includes a zoom position detection circuit 19 for obtaining current focal length position data of the zoom lens group 4, that is, a focal point detecting circuit 19 for generating focal length data (zoom position data Zpx) at the time of photographing. A distance detection means is provided, and the output end of the zoom position detection circuit 19, that is, the output end of the zoom position data Zpx is connected to the second control end of the AF data conversion circuit 17, and the second control end of the zoom drive circuit 13 described above. 1 control end. The second control end of the zoom drive circuit 13 is connected to the output end of the CPU 15, that is, the output end of the zoom drive amount data Z'.

A photometric circuit 20 is also connected to the CPU 15, and is configured to be controlled by a control signal C sent from the CPU 15, and to send back the set shutter time data T and the set aperture data F to the CPU 15, so that the desired It is now possible to perform photometry control.

Furthermore, each input terminal of this CPU 15 has
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.

Further, 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 described above to execute a predetermined program and data necessary for performing various controls.

Further, the set shutter time data T generated or detected by the photometry circuit 20 described above is transmitted to the CPU 15.
This sending end is connected to one input end of the determination circuit 27, and the other input end is connected to the output end of the zoom position detection circuit 19 described above.

Such a determination circuit 27 uses the set shutter time data T obtained by the photometry circuit 20, which is a set time detection means, and the zoom position detection circuit 1, which is a focal length detection means.
Focal length data obtained in step 9 (zoom position data Zpx
), a blur correction prohibition signal (inhibition signal I) is output when the image movement on the film surface due to camera shake falls within an allowable range.

Further, the valve switch 28 connected to the CPU 15 is activated when the shutter speed manual setting button or the like provided on the camera body is set to the valve speed (bulb mode).

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 object distance data Dx output from the F circuit 16, blur correction reference drive data BLwide, that is, BLwi
de=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 S0 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 detection unit 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 S1 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 speed data obtained by integrating the output Ak of the shake sensor 6a over a fixed period It at sampling intervals St.

A schematic representation 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.

[0051]

##EQU00001## When it is determined that the sampling performed in this manner has started, that is, step S1 is branched to YES, and the process proceeds to the next step S2. This step S2 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...
Offset data Boffs from Bk as shown in the following formula
This is because it is necessary to subtract et.

[0053]

[Equation 2] After the offset data is obtained in this way, the process moves to the next step S3, and it is determined whether or not the release button is half-pressed. If NO, the process returns to step S2 and YES is selected. In this case, the process moves to the next step S4 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, photometry and exposure calculation are performed, and the set shutter time data T and set aperture data F at that time are sent to the CPU 15.
sent to.

[0054] Continuing to the next step S5,
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).

[0055] Then, the process moves to the next step S6, where it is determined whether the above-mentioned data BoL(t) is equal to or larger than the predetermined reference data C1, and if NO, the process moves to the next step S7. Then, a determination is made as to whether blur correction should be prohibited. Specifically, the determination in step S7 is performed by a determination circuit based on the zoom position data Zpx obtained by the zoom position detection circuit 19 and the set shutter time data T sent from the CPU 15. .

Here, there are many combinations of the zoom position data Zpx and the set shutter time T during general shooting, depending on the drawing intention, and there is a high possibility that camera shake will occur in these combinations. For example, FIG. 4 shows a distinction between a region and a low region.

That is, when the set time based on the set shutter time data T is indicated by the symbol to, the focal length based on the zoom position data Zpx is on the longer distance side (in FIG. 4) than the position indicated by the symbol fo. In the case of the upper side), blur correction is required, and conversely, in the case of the short distance side (lower side in Figure 4), the blurring of the subject image on the film plane is within the permissible range. No blur correction is required.

From the opposite viewpoint, when the focal length based on the zoom position data Zpx is indicated by the symbol fo,
The set time based on the set shutter time data T is the code to
If the speed is faster than the position shown in (left side area in Figure 4), the actual blur of the subject image on the film plane is within the allowable range, so no blur correction is necessary, and conversely it is slow. (right region in FIG. 4), blur correction is required.

Therefore, in the case of NO in step S7, the process moves to the next step S8, and the flag indicating that the focus motor 7 is rotating, that is, the Mf flag, is set to "1", and the flowchart shown in FIG. The process proceeds to step S17 and step S44 in parallel.

On the other hand, if YES in step S6,
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.

[0061] Furthermore, if YES in step S7,
The combination of the set shutter time data T and the zoom position data Zpx is such that, for example, the shutter is at high speed or the focal length is on the short focal length side, so the change in the subject image on the film plane is within the permissible range. It is determined that shake correction is not necessary, that is, it is determined that shake correction is prohibited, and the process proceeds to step S9, and the CPU 1
5, the inhibition signal I is sent.

In step S9, the CPU 15 sends the inhibition signal I to the sampling circuit 6b of the camera shake detection section 6, and
This stops sampling. 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
The focus drive data Dfx is obtained by taking into account the contents of the zoom position data Zpx that is input to the data conversion circuit 17 and obtained by the zoom position detection circuit 19 (details will be described later).

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 determination is made by determining whether or not the focus drive data Dfx and the step number data (cumulative data) Pix generated in the photo interrupter 18 each time the focus motor 7 is driven step by step are equal when the focus is actually driven. More specifically, it is determined whether or not the focus motor 7 has been driven step by step for the number of steps required for focus drive.

[0064] 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.

[0065] 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
If the answer is O, the process remains on standby; if the answer is YES, the film exposure is completed and the process moves to step S43 shown in FIG. 3, 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 S6, that is, it is determined that the amount of camera shake is less than a predetermined value, and further, when it is determined NO in step S7, that is, it is determined that blur correction is necessary. When it is determined that there is a focus motor flag Mf is set to "1" in the next step S8, the first system consisting of steps S17 to S43 and the second system consisting of steps S44 to S48 shown in FIG. The systems will be executed in parallel.

Next, 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. Find the value.

Next, proceeding to step S18, k=1, V
o=0 (where k is the number of times sampling is performed, which is 32, and Vo is the first data in the camera movement speed data Vk mentioned above).

[0069] The reason why Vo=0 is set here is that the camera movement speed data Vk immediately before starting a series of camera shake detections 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.

[0071]

[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 the first storage means, and the current Vk is also calculated in the second storage means. second memory as 1
1b.

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 set to the previous Bk-1 and becomes the previous Bk-1. 1 memory 11a to the first memory 11a.
is input to the 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.

When the focus motor 7 is stopped in step S21, the branch is YES and the process proceeds 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).

[0077] If YES in step S22, the process moves to the next step S24, and the release switch 2 is
It is determined whether or not 1 is ON, and if it is not ON, it is incremented in step S23 and steps S19 to S22 are executed again.

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.

[0083] 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 subject distance data Dx in this case will be explained using FIG. 6.

In the photographing optical system R having the film surface 2 inside the camera body P toward the rear and the principal point Q inside the camera body P 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 point B2 is connected to the perpendicular line of the principal point Q and the optical axis O.
This is a point located a distance y1 above the intersection B1.

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, which means that point A4 has moved to point A3 based on film plane 2. becomes the same as

[0087] 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.

[0088] Therefore, the distance y2 is affected by the distance x2 (subject distance).

Therefore, the subject 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, Dx
) is required.

Note that 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+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. 16, it can be expressed as in the following equation.

[0092]

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

Now, the calculating 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. 7, the shake correction drive that follows the movement becomes as indicated by symbol b. .

That is, as shown in an enlarged view in FIG. 8, 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.

Although it is desirable that points C1 and C2 match perfectly, 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, it can be obtained by Vk=Vk-1+2Bk-Bk-1. be able to.

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 the direction perpendicular to the optical axis O. By moving the image to , camera shake prediction correction is performed.

[0100] 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 if NO, the number of times k of sampling is incremented in the next step S32 in order to perform sampling again.

[0101] Then, from step S33 to step S3
8 is the above-mentioned steps S19, S20, S25, S26,
The process is performed in the same manner as S27 and S28, and after the shake actuator is driven in step S38, the process returns to step S30. In step S30, the time Ss obtained by subtracting the sampling interval It from the shutter time is calculated, and in the next step S31, A determination is made as to whether the time Ss is less than or equal to 0, and if NO, steps S32 to S38 are performed again as described above.

[0102] These steps S32 to S3
8 is repeated in step S31.
<0? In other words, while the shutter is open, blur prediction correction is repeatedly performed based on blur detection.

[0103] If YES in step S31, the process moves to step S39, where it is determined whether the shutter is closed, and if NO, the process moves to step S39 again.
is executed and placed in a standby state, and if YES, the process moves to the next step S40, 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 S41, the operation of the actuator drive circuit 14 is stopped by the inhibition signal I sent from the CPU 15, and the blur correction actuator 9 is stopped.

[0104] Next, in step S42, the sampling circuit 6b of the camera shake detection section 6 stops operating in response to the prohibition signal I sent from the CPU 15 in the same manner as in step S41 described above, and the process moves to the next step S43, and the next time 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, the operation of the second system moves to step S44 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 set shutter time data T and the set aperture data F value corresponding to the appropriate exposure value based on the measured value are determined.

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 S45, focus driving is performed using this data Dfx.

Next, the process moves to step S46, and Dfx-
A determination is made as to whether Pix=0.

This judgment is made based on focus drive amount data Dfx corresponding to the number of drive steps of the focus motor 7 during actual focus drive, and step number data Pix generated in the photo interrupter 18 each time the focus motor 7 is driven step by step. More specifically, it is determined whether the focus motor 7 has been driven step by step by the number of steps to be driven by focus.

[0109] If NO in step S46, 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 S47, the step drive of the focus motor 7 is continued. 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, 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. 7 and 8 because predictive calculations are 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. 9, 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.

[0113] Also, the judgment circuit 27 is used to determine whether or not blur correction is necessary, specifically, whether or not blur correction is necessary based on the combination of zoom position data Zpx and set shutter time data T. Since the system determines the amount of blur correction and prohibits blur correction when it is unnecessary, it is possible to prevent consumption of the power supply battery and the wear and tear of the blur correction mechanism.

[0114] In the above embodiment, the prediction calculation performed to cancel camera shake uses three types of data, namely, 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. 10 to 13.

FIG. 10 shows a circuit configuration of a second embodiment of the present invention, and the differences from the configuration shown in FIG. 1 described 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.

[0118] 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.
is connected to the input end of the

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

The flowcharts shown in FIGS. 11 and 12 show the operation of this embodiment, and there are many parts that are the same as the flowcharts (FIGS. 2 and 5) 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. 11 and 12, step P0
to step P19 and from step P44 to step P48 are step S in the first embodiment described above.
The operations are the same as those of 0 to S19 and S44 to S48. 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 sent to the sampling circuit 6.
b is obtained as shown in the following equation.

[0126]

[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 that the current Vk is calculated based on the current Bk,
This current Bk is stored in the first memory 31a, and similarly, the current Vk is stored in the third memory 31c. The current Bk stored in the first memory 31a is
When the first arithmetic circuit 30a receives the next Bk sent from the sampling circuit 6b, the previous Bk-
1, and from the first memory 31a to the second memory 31b
At the same time, the signal is input to the first arithmetic circuit 30a.

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

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. 5) in the first embodiment described above.

[0131] 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 P38 are as follows.
Steps P25 to P28 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 P39, where it is determined whether the shutter is closed, and if the answer is NO, the process moves to step P39 again. is executed and placed in standby state, YE
In the case of S, the process moves to the next step P40, 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 P41.
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.

[0133] Next, in step P42, 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 P43, 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 13, the camera shake correction will follow the movement. The drive becomes as indicated by the symbol b.

[0136] 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.

[0137] 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=Bk-1-Bk.

[0138] 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. This can be expressed as 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 blur 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, and the camera is moved using this stored data and the current (time t) blur change amount data Bk. Velocity data Vk is calculated, 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.

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.

[0141] In addition, as a result, the blur correction required area in the determination circuit 27 is expanded, that is, the shaded area in FIG. 4 is translated to the right side in the drawing.

[0142] It goes without saying that the present invention is not limited to the above-described embodiments, but can be implemented in various modifications 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.

[0144] 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. Further, it is left to the design freedom to modify the amount of blur correction depending on the magnitude of the subject distance.

Furthermore, in the first and second embodiments described above, the necessity or non-necessity of blur correction is determined based on the zoom position data Zpx and the set shutter time data T. The calculation result of the image stabilization amount, that is, the image stabilization amount data BLzp which is the output of the third calculation circuit 30c is additionally inputted to the determination circuit 27, and these three
It may be determined whether blur correction is necessary or not based on the type of data.

Furthermore, it goes without saying that the determination area for determining whether blur correction is necessary or not may be set in a manner other than that shown in FIG.

By the way, camera shake detection is generally performed in an integral format using the camera shake detector 6, etc., and since the camera shake correction drive is repeatedly performed while the shutter is open. In this case, there is a risk that errors will be accumulated during the shutter opening time.

[0150] For example, when the shake correction drive is opened, 0.1%
If there is an error of 1g=9.8m/S2, the error will be 9.8mm/S2 and the amount is Δx=
(1/2) g・t2, so after 1 second, (1/2)
×9.8×12, that is, a displacement error of 4.9 mm,
This creates a new problem because this error accumulates over time.

For this reason, when the valve switch 28 detects that the set shutter time is, for example, the valve time (valve mode), it is determined that blur correction is impossible, and the CPU 15 issues an inhibition signal I. It is desirable to send the signal to the actuator drive circuit 14 and the sampling circuit 6b to prohibit the blur correction operation.

Furthermore, since the same thing as described above applies not only to the valve seconds but also to the time seconds, the blur correction operation may be prohibited when the time is seconds.

Further, the blur correction operation may be prohibited not only at the valve time but also at a predetermined slow time such as 1/2 second or 1 second, for example.

[0154]

Effects of the Invention As is clear from the above explanation, when the correction optical member inserted in the optical path of the photographing optical system is driven in the direction of correcting blurring, each time point at a predetermined interval is A predictive calculation is performed based on camera movement speed data and shake change amount data to obtain shake correction data at the time of driving the above-mentioned correction optical member, and camera shake correction is performed in accordance with this data. Regardless of the size of the camera operator's camera shake, or even if the camera shake occurs continuously, correction can be performed to effectively cancel out the camera shake, resulting in the occurrence of camera shake. No camera can be provided that can take good pictures.

Furthermore, blur correction is impossible because the blur correction drive is prohibited depending on the combination of shutter speed and focal length, or at a predetermined long speed, time speed, or bulb speed. Regardless, it is possible to prevent wasteful blur correction driving from being performed, thereby preventing an increase in power consumption and suppressing wear and tear on the drive mechanism.

[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 diagram showing criteria for determination by determination means in the first embodiment.

FIG. 5 is a flowchart for explaining the operation of the first embodiment.

FIG. 6 is an optical path diagram for explaining the relationship between camera shake and changes in the imaging point.

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

FIG. 8 is a partially enlarged view of FIG. 6;

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 in a second embodiment of the present invention.

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

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

FIG. 13 is a waveform diagram showing the operating 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 a waveform diagram showing a correction operation of a conventional camera with an image stabilization function.

FIG. 16 is a partially enlarged view of FIG. 15;

FIG. 17 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 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 Judgment circuit 28 Valve switch 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. an image stabilization actuator that moves or tilts the camera body in a direction; a camera shake detection unit that converts the camera body's camera shake into an electrical signal to obtain camera shake detection data at multiple points in time; and a camera shake that moves the image position on the film surface due to the camera body's camera shake. a calculation means for calculating blur correction data based on the camera shake detection data obtained at a plurality of points in order to drive and correct the correction optical member with the blur correction actuator; a set second detection means for detecting, a focal length detecting means for detecting the focal length of the photographing optical system during photographing, a prohibition means for prohibiting the blur correction operation by the correction optical member, and a set second detection means Outputs a blur correction prohibition signal when the image movement on the film surface due to camera shake falls within the permissible range based on the set shutter speed data detected by the camera and the focal length data detected by the focal length detection means. and a control means configured to actuate the prohibition means to prohibit the blur correction operation by the correction optical member when a blur correction prohibition signal is output from the judgment means. A camera with an image stabilization function. 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. an image stabilization actuator that moves or tilts the camera body in a direction; a camera shake detection unit that converts the camera body's camera shake into an electrical signal to obtain camera shake detection data at multiple points in time; and a camera shake that moves the image position on the film surface due to the camera body's camera shake. a calculation means for calculating blur correction data based on the camera shake detection data obtained at a plurality of points in order to drive and correct the correction optical member with the blur correction actuator; a set time detection means for detecting, a prohibition means for prohibiting the blur correction operation by the correction optical member, and a set shutter time data detected by the set time detection means when the set shutter time is longer than a predetermined slow shutter time; a determining means for outputting a blur correction prohibition signal when the camera shake correction is being performed; A camera with an image stabilization function, comprising: a control means for controlling the camera. 3. The determination means according to claim 2 is configured to determine that the shutter time is a predetermined slow shutter time and output a blur correction prohibition signal when the shutter time is set to a bulb time or a time time. A camera with an image stabilization function.